Method and apparatus to drive coils of a multiphase electric machine

Information

  • Patent Grant
  • 11967913
  • Patent Number
    11,967,913
  • Date Filed
    Thursday, May 12, 2022
    2 years ago
  • Date Issued
    Tuesday, April 23, 2024
    9 months ago
Abstract
Disclosed is a series mode modulation configuration and a parallel voltage equivalent modulation configuration. In the series mode modulation configuration a unipolar modulation is utilized. Unipolar modulation utilizes a zero vector and produces a voltage across the load with a frequency factor of 2×. In the parallel voltage equivalent mode modulation configuration there are two H bridges driving two coils with identical current. The H bridges can advantageously be operated out of phase with one another (e.g., 180 out of phase with one another to interleave the currents to further reduce ripple current stress.
Description
BACKGROUND
Technical Field

The present disclosure generally relates to methods and apparatus to drive coils or windings of multiphase electric machines (e.g., electric motor, an induction motor, generator), and in particular to methods and apparatus employing coil driver modulation techniques.


Description of Related Art

Voltage source inverters (VSI) utilize an energy storage element on a DC link to provide a fixed, low AC impedance, DC voltage to the switching elements. The storage element is generally a capacitor, but can also be other types of storage elements, for example voltage sources, for instance a primary or secondary chemical battery (e.g., a lithium ion battery), or the like. The DC voltage is then applied to a load via switches to generate the desired output voltage via variable ON time, fixed frequency, i.e., duty cycle, or less typically a combination of variable ON time and variable frequency. The switches are generally semiconductor switches (e.g., Metal Oxide Field Effect Transistors (MOSFETs), Insulated Gate Bipolar Transistors (IGBTs)).


Although analog control is possible, most inverters employ a Pulse Width Modulation (PWM) pattern using a microcontroller with specifically designed timer/counter blocks. The main principle of PWM technique is that through ON/OFF control on the switches (e.g., semiconductor switches), a series of pulses with the same amplitude and different width are generated on an output port to replace the sinusoidal wave or other waveforms typically used. The duty cycle of the output waveform needs to be modulated by a certain rule and as a result both the output voltage and output frequency of the inverter can be regulated.


The most common approach is called “center aligned PWM”, where all the pulses for the various phases (e.g., three phases) use the same “timer top”. Another approach is called “edge aligned PWM” where all of the phases (e.g., three phases) share the leading edge, but turn OFF at different times to generate the desired average voltage per phase.



FIG. 3 illustrates a center aligned 3 phase PWM pattern. The three phases (phase A, phase B, and phase C) are all centered on a timer center. Each of the three phases shares an ON state and an Off state. Each of the phases has a different duty cycle, but each is centered on the timer center as shown. In other words, the pulse center is fixed in the center of a time window and both edges of each pulse moves to compress or expand the width of the corresponding pulse.


Due to an interaction between the three generated line voltages in a conventional three phase inverter there is not a lot of flexibility in varying the way the duty cycles are applied to the output in order to generate the desired voltages.


The energy storage element on the DC link supplies the current, and the switches are operated at the PWM frequency to generate the desired output voltage/current. Generating the desired output voltage/current puts a large ripple current stress on the storage element. A general rule of thumb is that a DC link storage element worst case Root Mean Square (RMS) ripple current exposure is approximately 0.6× the RMS phase current. As an example, a 100 A RMS per phase inverter would generate about 60 A RMS ripple current in the DC link storage element.


SUMMARY

The large RMS current requirement on a DC link storage element drives both cost and size/weight. Therefore reducing the RMS current results in a cost and size/weight reduction for motor drives.


The PWM drive scheme described herein in conjunction with an inverter topology comprising a pair of half bridges (H bridges) and a series switch can advantageously provide a large reduction in RMS ripple current stress on the DC storage element. The described motor drive topology, where there is essentially no PWM or voltage interaction between phases, makes it possible to change the PWM pattern(s) to reduce the ripple current stress on the storage element.


It should be noted that modulator angle refers to an angle of a saw tooth carrier generating the PWM for each H bridge. This saw tooth carrier can be an analog voltage used to compare against the demand by a comparator, or a waveform generated by count up/down timers and counter compare.


Compared to conventional three phase inverters, the disclosed coil driver utilizing the disclosed modulation method has much lower ripple current, peak-to-peak current, and raises the order of the harmonic content. This greatly simplifies capacitor and EMI filter design and reduces their size/weight.


According to one aspect, an apparatus may be summarized as a coil driver for each phase of a multi-phase electric machine that comprises:

    • a DC energy store coupled between ports of the coil driver;
    • a first switch pair, the first switch pair having at least two switch elements connected in series between the ports of the coil drive and having a first node between the at least two switch elements;
    • a second switch pair, the second switch pair having at least two switch elements connected in series between the ports of the coil drive and having a second node between the at least two switch elements, wherein a first AC drive current or AC voltage for a first coil is generated between the first node and the second node;
    • a third switch pair, the third switch pair having at least two switch elements connected in series between the ports of the coil drive and having a third node between the at least two switch elements;
    • a fourth switch pair, the fourth switch pair having at least two switch elements connected in series between the ports of the coil drive and having a fourth node between the at least two switch elements, wherein a second AC drive current or AC voltage for a second coil is generated between the third node and the fourth node;
    • a fifth switch pair, the fifth switch pair having at least two switch elements connected in series between the second node and the third node;
    • wherein:
    • in a first mode the first switch pair, the fourth switch pair, and the fifth switch pair are on and the second switch pair and the third switch pair are off,
    • in a second mode the first switch pair, the second switch pair, the third switch pair, and the fourth switch pair are on, and the fifth switch pair is off and
    • in the first mode the first and second AC voltages have a frequency factor that is twice a drive modulation frequency of the switches.


According to one aspect, in the first mode an angle of a modulator carrier varies to drive each phase of a pulse width modulated pattern.


According to one aspect, in the first mode the angle of the modulator carrier varies for each phase by one of +/−120 degrees and +/−60 degrees.


According to one aspect, in the second mode two H bridges drive identical current.


According to one aspect, in the second mode two identical currents are interleaved.


According to one aspect, in the second mode a modulator carrier varies to drive each phase with a carrier angle offset between at least 60° and 120°.





BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

In the drawings, identical reference numbers identify similar elements or acts. The sizes and relative positions of elements in the drawings are not necessarily drawn to scale. For example, the shapes of various elements and angles are not necessarily drawn to scale, and some of these elements may be arbitrarily enlarged and positioned to improve drawing legibility. Further, the particular shapes of the elements as drawn, are not necessarily intended to convey any information regarding the actual shape of the particular elements, and may have been solely selected for ease of recognition in the drawings.



FIG. 1A is a schematic diagram of a system including an electric machine and a controller.



FIG. 1B is a schematic diagram showing a single phase coil driver, according to at least one illustrated implementation.



FIG. 2 is a graph showing a respective current for each phase of a 3-phase system.



FIG. 3 is a graph illustrating a center aligned PWM approach.



FIG. 4 is a graph illustrating a center aligned 3-phase PWM pattern.



FIG. 5 is a schematic diagram of a delta connection of a 3 phase equivalent load.



FIG. 6 is a graph illustrating a phase current/coil current.



FIG. 7 is a graph illustrating ripple current stress on a DC link.



FIG. 8 is a graph illustrating a spectrum of a ripple current in a DC link.



FIG. 9 is a graph illustrating carriers and generated PWM signals.



FIG. 10 is a graph illustrating an impact of carrier angle on ripple current.



FIG. 11 is a graph illustrating DC link ripple in series mode of operation.



FIG. 12 is a graph illustrating ripple current spectrum of the DC link ripple in the series mode of operation.



FIG. 13 is a graph showing an effect on DC link ripple when varying carrier angle between H bridges for each phase in a parallel voltage equivalent mode of operation.



FIG. 14 is a graph showing an impact of a 120° offset and interleaving of H bridge pairs for a given phase.



FIG. 15 is a graph illustrating coil currents.



FIG. 16 is a graph illustrating DC link currents when operating in the parallel voltage equivalent mode of operation.



FIG. 17 is a graph illustrating a harmonic content of the DC ripple current during the parallel voltage equivalent mode of operation.





DETAILED DESCRIPTION

In the following description, certain specific details are set forth in order to provide a thorough understanding of various disclosed embodiments. However, one skilled in the relevant art will recognize that embodiments may be practiced without one or more of these specific details, or with other methods, components, materials, etc.


Unless the context requires otherwise, throughout the specification and claims which follow, the word “comprise” and variations thereof, such as, “comprises” and “comprising” are to be construed in an open, inclusive sense, that is, as “including, but not limited to.”


Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.


As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the content clearly dictates otherwise. It should also be noted that the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise.


The headings and Abstract of the Disclosure provided herein are for convenience only and do not interpret the scope or meaning of the embodiments.



FIG. 1A shows a system 100 including an electric machine 110 (e.g., electric motor, induction motor, generator) and control subsystem 120, according to at least one illustrated implementation.


The electric machine 100 can take the form a multiphase electric machine, for instance a three phase electric motor (e.g., three phase permanent magnet (PM) motor), induction motor, or the like. The electric machine 100 can, for example, include a rotor with a plurality of permanent magnets arrayed thereabout, and a stator with a plurality of coils or windings arrayed thereabout. The rotor is mounted to rotate with respect to the stator, for instance in response to selective excitation of magnetic fields in the coils or windings.


The control system 120 is coupled to control the electric machine by one or more control lines 130, for example via operation of various switches to control the selective excitation of magnetic fields in the coils or windings, as described in detail herein. The control system 120 can include one or more processors (e.g., microprocessors, microcontrollers, digital signal processors (DSPs), graphics processing units (GPUs), field programmable gate arrays (FPGAs), programmable logic units (PLUs), motor controllers, or other control circuits. The control system can include one or more nontransitory storage media, for example memory (e.g., read only memory (ROM), random access memory (RAM), FLASH memory) or other media (e.g., magnetic disk drive, optical disk drive), which stores processor-executable instructions, which when executed by one or more processors cause the one or more processors to execute logic to control operation of the electric machine, for instance as described herein. The control system can include one or more sensors 140 or receive information from one or more sensors 140, for example one or more current sensors, voltage sensors, position or rotary encoders, Hall effect sensors, or Reed switches, which allow the operation of the electric machine and control circuitry to be monitored.



FIG. 1B is a schematic diagram of a circuit 200 for a single phase of an electric machine (e.g., electric motor), according to at least one illustrated implementation. Each phase of the electric machine has two or more coils or distinct portions or segments of a coil or winding for the phase of the electric machine, denominated in FIG. 1B as L1 and L2. The circuit 200 is sometimes referred to herein and in the claims as a single phase coil driver or simply referred to as a coil driver even though the illustrated circuit 200 includes the coils, windings, or portions or segments of the coils or windings. For a multiphase electric machine (e.g., three phase permanent magnet (PM) motor) there would be a respective circuit 200 for each phase of the multiphase electric machine.


In FIG. 1B L1 and L2 represent motor coils for the single phase and C1 is the DC link energy storage element. Switches S1, S2, S3, S4, S6, S7, S8, and S9 function as PWM switches for the inverter and S5 is a series switch. Typically the switches would be comprised of one or more semiconductor devices, for example silicon or silicon carbide MOSFET, IGBT etc. A controller 210 is coupled to the switches by one or more control lines CL1-CL4 and drives the switches. The controller 210 can be a microcontroller or the like.


The coil driver depicted in FIG. 1B has two operating modes a series mode and a parallel mode. In the series mode, S5 is ON, S3, S4, S6, and S7 are “OFF” and S1, S2, S8, and S9 are in “PWM” mode forming an active “H bridge” driving the series connected coil. In series mode coil pairs from each phase are switched in series and driven by one H bridge per phase. In the parallel mode S5 is “OFF” and S1 to 4 and S6 to S9 are in “PWM” mode, which creates two H bridges driving L1 and L2 as individual coils. In parallel mode the coil pairs are individually driven by their own H bridge, resulting in 2 H bridges per phase.


The coil driver for each phase of a multiphase electric machine shown in FIG. 1B includes a DC energy store C1 coupled between ports B+ and B− of the coil driver and four switch pairs and a series switch. A first switch pair has at least two switch elements S1, S2 connected in series between the ports of the coil drive and having a first node between the at least two switch elements S1, S2. A second switch pair having at least two switch elements S3, S4 connected in series between the ports of the coil drive and having a second node between the at least two switch elements S3, S4. A first AC drive current or AC voltage for a first coil L1 is generated between the first node and the second node. A third switch pair is connected in series between the ports of the coil drive and having a third node between the at least two switch elements S6, S7. A fourth switch pair having at least two switch elements S8, S9 connected in series between the ports of the coil drive and having a fourth node between the at least two switch elements. A second AC drive current or AC voltage for a second coil L2 is generated between the third node and the fourth node. A fifth switch S5 is connected in series between the second node and the third node.


There are two distinct operating modes that provide different opportunity for ripple current reduction. In a series mode coil pairs from each phase are switched in series and driven by one H bridge per phase. In a parallel mode the coil pairs are individually driven by their own H bridge, resulting in 2 H bridges per phase.


Each of the two operating modes are distinct and offer different opportunities for ripple current reduction.


To compare the effect of the presented modulation scheme the following simulations were adjusted such that the operating point for the inverter and coil driver is kept consistent. Since it is well known in the field that modulation depth, current angle, and the like have a large influence on DC link ripple current, the load and operating voltage is adjusted to maintain these the same. It should be noted that this is only done for academic reasons, because in reality series and parallel modes allow a machine to operate over a wider range of speeds and torques resulting in widely varying operating conditions. Specifically, the operating point in series and in parallel, by definition, cannot be the same.



FIG. 2 shows a current for each phase of a 3-phase system. The currents in FIG. 2 are balanced. A mathematical property of a balanced three phase system is that quantities at any instant, for example all three currents, sum to zero. Put another way,

Ia+Ib+Ic=0  (eq. 1).


One aspect of the proposed modulation method utilizes the property of the three phase quantities to adjust the PWM such that a maximum current cancelation occurs.


One aspect of the invention is to reduce capacitor size. One factor that affects capacitor sizing is frequency. Accordingly, the modulation method would drive the current harmonics up in frequency, which has the effect of reducing capacitance requirements and simplifying EMI filter requirements.



FIGS. 3 and 4 show a center aligned PWM. The center aligned PWM forces all the “ON” times to overlap with each of the phases having a respective duty cycle variation. A baseline condition is a 3-phase inverter delivering the same coil current at the same modulation index, with the same coil impedance. Since the coil driver applies full DC link to the coils, the best comparison is a 3 phase drive with a delta connected load. This way the coil or delta leg currents are the same and the coils each have the same inductance/resistance. Since the coil driver can drive two coils, either in series or parallel, the parallel connected coils in delta for the 3 phase comparison is used to evaluate series mode ripple current. In operation, a series mode would put the two coils in series, resulting in an increase of the inductance and resistance by factor of 4. In the series mode, this also results in AC voltages across the coils having a frequency factor that is twice a drive modulation frequency. All other conditions are the same: DC link voltage and parasitic components (ESR/ESL), induced voltage in the machine, power factor (or current angle i.e., id/iq). The chosen operating point represents only q axis current (i.e., in phase with the induced voltage). It should be noted that the current angle in the coils will be the same, which means due to the nature of a delta connection, the current angle of the phase current will have a 30° angle with respect to coil current.



FIG. 5 is a delta connection of the 3 phase equivalent load. As shown, the coils V1,2, W1,2, and U1,2 are connected in a delta configuration. A phase current/coil current relationship is shown in FIG. 6 and a ripple current stress on the DC link is shown in FIG. 7.


In one example, each coil has a peak current of 100 A. In other words, two coils in parallel means that the delta leg current is 200 A peak. Delta Leg to phase current has a √{square root over (3)} relation, specifically,

i*√{square root over (3)}=ipeak  (eq. 2)

In the given example, 200*√{square root over (3)}=346 Apk, which corresponds to 244 A RMS, which matches a calculated result.


At this operating point a 3 phase drive generates an RMS ripple stress of approximately 160 Arms. This value matches the rule of thumb for 3 phase inverter which is

RMS ripple≈0.6*Iphase RMS  (eq. 3)


Thus, the DC link RMS ripple is calculated as 245*0.6=147 Arms.


Further, a peak current stress on the DC link is +130 A to −270 A, or about 400 A peak-to-peak. The peak-to-peak quantity is important because it represents a larger di/dt, which tends to generate larger overvoltages due to system inductance.



FIG. 8 shows a spectrum of ripple current in a DC link. The spectrum of the ripple current, shown in the frequency domain, shows harmonic content dominant at 20 kHz, which corresponds with 200 A, then 40 kHz, which corresponds with 75 A, and decaying from there.


The frequency relationship in unipolar modulation (H bridge) or common 3 phase bridge PWM methods has the following relationship linking switching frequency of the half bridge legs to the frequency applied to the load.

F_load=2*F_PWM  (eq. 4)


Since the DC link storage element has to supply the combined currents from all the bridge legs, this storage element is exposed to this same frequency of 2*F_PWM.


Series Mode Modulation Configuration


One aspect of the invention provides a series mode modulation configuration. For H bridges a unipolar modulation is utilized that drives the switches at a drive modulation frequency. Unipolar modulation utilizes a zero vector and produces a voltage across the load with a frequency factor of 2×. In other words, in the series mode, the AC voltages across the coils have a frequency factor that is twice the drive modulation frequency. This is a modulation method for 3 phase bridges. In operation, a 10 kHz half bridge frequency applies 20 kHz to the load.


In series mode for a 3-phase application, the coil driver operates as three independent H bridges. This configuration allows each phase to place the PWM signals in a manner such that ripple is reduced.


The series mode coil driver will run twice the current density into a series connected coil, representing twice the torque production in the machine. From a performance stand point, the coil driver is delivering twice the torque of the 3-phase drive, at the expense of a reduction in base speed due to the higher number of effective turns in the machine. Further, when in series mode, the overall load characteristic changes, compared to the same coils parallel connected, the resistance and inductance increases four times, and the induced voltage two times.


In a 3-phase system, because each phase is independent, each H bridge gets its own modulator. Each modulator can then be adjusted so the angle of the modulator carrier moves the PWM signals relative to each other as shown in FIG. 9. Intuitively, because this example is a 3-phase system, the angles between carriers should be balanced, i.e., +/−120°. For an n phase system, the angles would be adjusted to represent the characteristics of that system, i.e., carrier angle shift=360/(n phases).


As the angle of the carrier is swept from 0° to 180° the impact on RMS ripple current is shown in in FIG. 10. At 0° or 180° the system behaves like a normal 3-phase drive. It should be noted that a +/−60° offset also provides the same reduction. In addition to the reduction in RMS current stress, FIG. 11 shows the peak-to-peak stress is also reduced from 400 A peak-to-peak to 345 A peak-to-peak.


The ripple current spectrum of the series mode modulation shown in FIG. 12 showing the effect on the frequency content of the current. The dominant harmonic is still at 20 kHz as shown, but the amplitude is now only 83 A (previously 200 A), the 40 kHz and 60 kHz harmonics are depressed, and the next highest harmonic is at 80 kHz, about 28 A.


Parallel Mode Modulation Configuration


One aspect of the invention is a parallel mode modulation configuration. The parallel mode builds on the series mode modulation. In the parallel mode modulation configuration there are two H bridges driving two coils with identical current. These currents can be interleaved to further reduce the ripple current stress.


Each H bridge uses unipolar modulation. One way to generate this modulation is to use the same reference for each half bridge and provide a carrier with a 180° phase shift. In other words, one carrier is at 0° and the other carrier is at 180° for one H bridge. When the second H bridge is added, the carriers for the two half bridges are then −90° and 90° offset from the first H bridge. Subsequently, for each phase a rotation of +/−120° is applied equally to all four modulators of that phase.



FIG. 13 shows the effect on DC link ripple when varying carrier angle between H bridges for each phase in parallel mode when the +/−120° is removed from the series modulation and investigate the effect of only the interleaving when sweeping the interleaving angle. The DC link ripple current is significantly reduced and the best performance is centered on 90° offset.



FIG. 14 shows the impact of a 120° offset and interleaving of H bridge pairs. If the 120° offset used in series mode is added, there is a slight increase in DC link ripple current at 90°. Adding the 120° offset and interleaving of H bridge pairs provides two results. First, RMS ripple current is about 38 A RMS, which is reduced from 160 A RMS. Second, Peak-to-peak current is about 150 A. It should be noted that there is a current cancelation happening in the bridges reducing the di/dt applied to the DC link caps, which reduces generated voltage due to inductance. FIG. 15 is a graph showing coil currents and FIG. 16 is a graph showing DC link currents.


When the two H bridges are combined, 90° is not the best value. As seen in FIG. 14, minimum DC link ripple current is minimized at 80° and 100°. A side effect of this asymmetric modulation angle is a significant harmonic content at 20 kHz, and subharmonics on the DC link, the very slight improvement in ripple current in this case is far outweighed by the negative impact of the large harmonic and sub harmonic content. Utilizing the 90° angle completely eliminates 20 kHz harmonic and pushes all the DC link current harmonics up in frequency, and increases the dc ripple current by about 1 A RMS, or more specifically an increase of ˜3%.


Combining the disclosed modulation methods reduces the DC link ripple current from 160 A RMS for a conventional inverter delivering the same current, to a little under 40 A RMS for the coil driver. The harmonic content is also quadrupled (20 kHz to 80 kHz) in frequency. The dominant harmonic current is 80 kHz in contrast to 20 kHz of the previous modulation method, given a bridge leg switching frequency of 10 kHz. More generally the harmonic content is increased from 2*F_PWM to 8*F_PWM. The harmonic current at 80 kHz along with the dramatically reduced ripple current greatly simplifies capacitor design.


In the above description, certain specific details are set forth in order to provide a thorough understanding of various disclosed implementations. However, one skilled in the relevant art will recognize that implementations may be practiced without one or more of these specific details, or with other methods, components, materials, etc. In other instances, well-known structures associated with computer systems, server computers, and/or communications networks have not been shown or described in detail to avoid unnecessarily obscuring descriptions of the implementations.


The foregoing detailed description has set forth various embodiments of the devices and/or processes via the use of block diagrams, schematics, and examples. Insofar as such block diagrams, schematics, and examples contain one or more functions and/or operations, it will be understood by those skilled in the art that each function and/or operation within such block diagrams, flowcharts, or examples can be implemented, individually and/or collectively, by a wide range of hardware, software, firmware, or virtually any combination thereof. In one embodiment, the present subject matter may be implemented via Application Specific Integrated Circuits (ASICs). However, those skilled in the art will recognize that the embodiments disclosed herein, in whole or in part, can be equivalently implemented in standard integrated circuits, as one or more computer programs running on one or more computers (e.g., as one or more programs running on one or more computer systems), as one or more programs running on one or more controllers (e.g., microcontrollers) as one or more programs running on one or more processors (e.g., microprocessors), as firmware, or as virtually any combination thereof, and that designing the circuitry and/or writing the code for the software and or firmware would be well within the skill of one of ordinary skill in the art in light of this disclosure.


In addition, those skilled in the art will appreciate that the mechanisms taught herein are capable of being distributed as a program product in a variety of forms, and that an illustrative embodiment applies equally regardless of the particular type of physical signal bearing media used to actually carry out the distribution. Examples of signal bearing media include, but are not limited to, the following: recordable type media such as floppy disks, hard disk drives, CD ROMs, digital tape, and computer memory.


The various embodiments described above can be combined to provide further embodiments. Aspects of the embodiments can be modified, if necessary, to employ systems, circuits and concepts of the various patents, applications and publications identified herein to provide yet further embodiments.


Unless the context requires otherwise, throughout the specification and claims that follow, the word “comprising” is synonymous with “including,” and is inclusive or open-ended (i.e., does not exclude additional, unrecited elements or method acts).


Reference throughout this specification to “one implementation”, “one aspect”, or “an implementation” means that a particular feature, structure or characteristic described in connection with the implementation is included in at least one implementation. Thus, the appearances of the phrases “in one implementation”, “in an implementation”, or “in one aspect” in various places throughout this specification are not necessarily all referring to the same implementation. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more implementations.


The headings and abstract provided herein are for convenience only and do not interpret the scope or meaning of the implementations.


Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method acts that perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method acts shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.

Claims
  • 1. A system to drive a multiphase electric machine, the multi-phase electric machine having a respective plurality of coils for each phase, the system comprising a respective coil driver for each phase, each coil driver respectively comprising: a DC energy store coupled between ports of the coil driver;a first switch pair, the first switch pair having at least two switches connected in series between the ports of the coil drive and having a first node between the at least two switches;a second switch pair, the second switch pair having at least two switches connected in series between the ports of the coil drive and having a second node between the at least two switches, wherein a first AC drive current or a first AC voltage for a first coil is generated between the first node and the second node;a third switch pair, the third switch pair having at least two switches connected in series between the ports of the coil drive and having a third node between the at least two switches;a fourth switch pair, the fourth switch pair having at least two switches connected in series between the ports of the coil drive and having a fourth node between the at least two switches, wherein a second AC drive current or a second AC voltage for a second coil is generated between the third node and the fourth node;a fifth switch pair, the fifth switch pair having at least two switches connected in series between the second node and the third node;wherein: in a first mode, the first switch pair, the fourth switch pair, and the fifth switch pair are in an ON state and the second switch pair and the third switch pair are in an OFF state, andin a second mode the first switch pair, the second switch pair, the third switch pair, and the fourth switch pair are in an ON state, and the fifth switch pair are in an OFF state forming two H bridges, andwherein in the first mode the first and the second AC voltages have a frequency factor that is twice a drive modulation frequency of the switches.
  • 2. The coil driver of claim 1, wherein, in the first mode, a controller varies an angle of a modulator carrier to drive each phase of a pulse width modulated pattern.
  • 3. The coil driver of claim 2, wherein in the first mode, the controller varies the angle of the modulator carrier for each phase by one of +/−120 degrees and +/−60 degrees.
  • 4. The coil driver of claim 1, wherein a controller drives the switches in the first mode such that a number of harmonics between 20 kHz and 80 kHz each have a lower amplitude than a number of harmonics at 20 kHz and 80 kHz.
  • 5. The coil driver of claim 1, wherein in the second mode the two H bridges drive identical currents.
  • 6. The coil driver of claim 5, wherein in the second mode the two identical currents are interleaved.
  • 7. The coil driver of claim 5, wherein in the second mode a controller varies a modulator carrier to drive each coil with a carrier angle offset between at least one of: 60° and 120°, and80° and 100°.
  • 8. The coil driver of claim 5, wherein in the second mode a controller varies a modulator carrier to drive each phase with a 90° carrier angle offset.
  • 9. The coil driver of claim 8, wherein in the second mode a control circuit drives the switches such that a 20 kHz harmonic is eliminated.
  • 10. The coil driver of claim 7, wherein a control circuit drives the switches such that a dominant harmonic is at 80Khz.
  • 11. The coil driver of claim 8, wherein in the second mode a control circuit drives the switches such that a 2*F_PWM harmonic is eliminated, wherein F_PWM is a pulse width modulation frequency.
  • 12. The coil driver of claim 7, wherein a control circuit drives the switches such that a dominant harmonic is at 8*F_PWM, wherein F_PWM is a pulse width modulation frequency.
  • 13. The coil driver of claim 1, wherein the multiphase electric machine is an induction motor.
  • 14. A method to drive a multiphase electric machine, the multi-phase electric machine having a respective plurality of coils for each phase, the system comprising a respective coil driver for each phase, each coil driver respectively comprising at least a first switch pair, the first switch pair having at least two switches connected in series between ports of the coil drive and having a first node between the at least two switches; a second switch pair, the second switch pair having at least two switches connected in series between the ports of the coil drive and having a second node between the at least two switches, wherein a first AC drive current or a first AC voltage for a first coil is generated between the first node and the second node; a third switch pair, the third switch pair having at least two switches connected in series between the ports of the coil drive and having a third node between the at least two switches; a fourth switch pair, the fourth switch pair having at least two switches connected in series between the ports of the coil drive and having a fourth node between the at least two switches, wherein a second AC drive current or a second AC voltage for a second coil is generated between the third node and the fourth node; a fifth switch pair, the fifth switch pair having at least two switches connected in series between the second node and the third node, the method comprising: switching the first switch pair, the fourth switch pair, and the fifth switch pair into an ON state and the second switch pair and the third switch pair into an OFF state in a first mode; andswitching the first switch pair, the second switch pair, the third switch pair, and the fourth switch pair into an ON state, and the fifth switch pair into an OFF state forming two H bridges in a second mode,wherein in the first mode the first and the second AC voltages have a frequency factor that is twice a drive modulation frequency of the switches.
  • 15. A method of operation of a system to drive a multiphase electric machine, the multiphase electric machine having a respective plurality of coils for each phase, the system comprising a respective coil driver for each phase, for each phase of a multi-phase electric machine the method comprising: switching the respective coil driver for each phase of the multiphase electric machine to drive the respective coils for the phase of the multiphase electric machine in one of a series mode and a parallel mode,wherein, the series mode comprises: driving a respective plurality of coils for each phase; andwherein the parallel comprises: driving each the plurality of coils for each phase with an identical current by a respective H bridge circuit,wherein in the first mode a first and a second AC voltages have a frequency factor that is twice a drive modulation frequency of the switches.
  • 16. The coil driver modulation method of claim 15, wherein in the series mode, the method further comprising: driving each phase by signals that are shifted by one of +/−120 degrees and +/−60 degrees.
  • 17. The coil driver modulation method of claim 15, wherein in the parallel mode, the method further comprising: driving each phase with a carrier having an angle offset between at least one of: 60° and 120°, and an additional 90° between modulators of each H bridge pair of each respective phase.
CROSS REFERENCE TO RELATED APPLICATIONS

The present application for patent claims the benefit of U.S. Provisional Patent Application No. 63/188,151 filed May 13, 2021, and expressly incorporated by reference herein.

US Referenced Citations (876)
Number Name Date Kind
757394 Eickemeyer et al. Apr 1904 A
908097 Herz Dec 1908 A
1980808 Leibing Nov 1934 A
2091190 Tullio Aug 1937 A
2189524 Randolph et al. Feb 1940 A
2333575 Kilgore et al. Nov 1943 A
2407883 Corwill Sep 1946 A
2430886 Glen Nov 1947 A
2432117 Morton Dec 1947 A
2488729 Kooyman Nov 1949 A
2504681 Hall Apr 1950 A
2516114 Green Jul 1950 A
2601517 Hammes Jun 1952 A
2680822 Brainard Jun 1954 A
2719931 William Oct 1955 A
3083311 Shelley Mar 1963 A
3149256 Walter Sep 1964 A
3153157 Erich Oct 1964 A
3169203 Lavin et al. Feb 1965 A
3223865 Lewis Dec 1965 A
3237034 Shelley Feb 1966 A
3293470 Richard Dec 1966 A
3411027 Heinz Nov 1968 A
3482156 Porath Dec 1969 A
3549925 Johnson Dec 1970 A
3621370 Vandervort Nov 1971 A
3713015 Frister Jan 1973 A
3801844 Steele Apr 1974 A
3809936 Klein May 1974 A
3870928 Allen Mar 1975 A
3903863 Katsumata Sep 1975 A
3942913 Bokelman Mar 1976 A
3944855 Le Mar 1976 A
3965669 Larson et al. Jun 1976 A
3973137 Drobina Aug 1976 A
3973501 Briggs Aug 1976 A
3984750 Pfeffer et al. Oct 1976 A
3992641 Heinrich et al. Nov 1976 A
4001887 Platt et al. Jan 1977 A
4004426 Laing Jan 1977 A
4013937 Pelly et al. Mar 1977 A
4015174 Cotton Mar 1977 A
4020369 Shoupp et al. Apr 1977 A
4023751 Richard May 1977 A
4035701 Jensen Jul 1977 A
4039848 Winderl Aug 1977 A
4050295 Harvey Sep 1977 A
4051402 Gruber Sep 1977 A
4074159 Robison Feb 1978 A
4074180 Sharpe et al. Feb 1978 A
4081726 Brimer et al. Mar 1978 A
4095922 Farr Jun 1978 A
4100743 Trumbull et al. Jul 1978 A
4107987 Robbins et al. Aug 1978 A
4126933 Anderson et al. Nov 1978 A
4141331 Mallory Feb 1979 A
4142696 Nottingham Mar 1979 A
4142969 Funk et al. Mar 1979 A
4151051 Evans Apr 1979 A
4155252 Morrill May 1979 A
4159496 Stevens Jun 1979 A
4167692 Sekiya et al. Sep 1979 A
4168459 Roesel Sep 1979 A
4179633 Kelly Dec 1979 A
4181468 Kent et al. Jan 1980 A
4187441 Oney Feb 1980 A
4191893 Grana et al. Mar 1980 A
4196572 Hunt Apr 1980 A
4203710 Farr May 1980 A
4211945 Tawse Jul 1980 A
4215426 Klatt Jul 1980 A
4237391 Schur et al. Dec 1980 A
4245601 Crowder Jan 1981 A
4246490 Keramati et al. Jan 1981 A
4247785 Apgar Jan 1981 A
4253031 Frister Feb 1981 A
4254344 Fancy et al. Mar 1981 A
4260901 Woodbridge Apr 1981 A
4261312 Hart Apr 1981 A
4261562 Flavell Apr 1981 A
4276481 Parker Jun 1981 A
4286581 Atkinson Sep 1981 A
4289970 Deibert Sep 1981 A
4291235 Bergey et al. Sep 1981 A
4297604 Tawse Oct 1981 A
4302683 Burton Nov 1981 A
4305031 Wharton Dec 1981 A
4308479 Richter Dec 1981 A
4313080 Park Jan 1982 A
4316096 Syverson Feb 1982 A
4317437 Lindgren Mar 1982 A
4322667 Ohba Mar 1982 A
4329138 Riordan May 1982 A
4338557 Wanlass Jul 1982 A
4339704 McSparran et al. Jul 1982 A
4340822 Gregg Jul 1982 A
4355276 Vittay Oct 1982 A
4358693 Palmer et al. Nov 1982 A
4364005 Kohzai et al. Dec 1982 A
4373488 Neuhalfen Feb 1983 A
4385246 Schur et al. May 1983 A
4389691 Hancock Jun 1983 A
4394720 Gabor Jul 1983 A
4402524 D'Antonio et al. Sep 1983 A
4406950 Roesel Sep 1983 A
4412170 Roesel Oct 1983 A
4419617 Reitz Dec 1983 A
4433280 Lindgren Feb 1984 A
4433355 Chew et al. Feb 1984 A
4434389 Langley et al. Feb 1984 A
4434617 Walsh Mar 1984 A
4444444 Benedetti et al. Apr 1984 A
4446377 Kure-Jensen et al. May 1984 A
4454865 Tammen Jun 1984 A
4456858 Loven Jun 1984 A
4458489 Walsh Jul 1984 A
4459536 Wirtz Jul 1984 A
4473751 Rombach et al. Sep 1984 A
4477745 Lux Oct 1984 A
4503368 Sakamoto Mar 1985 A
4511805 Boy-Marcotte et al. Apr 1985 A
4513576 Dibrell et al. Apr 1985 A
RE31947 Farr Jul 1985 E
4532431 Iliev et al. Jul 1985 A
4532460 Gale et al. Jul 1985 A
4535263 Avery Aug 1985 A
4536668 Boyer Aug 1985 A
4536672 Kanayama et al. Aug 1985 A
4539485 Neuenschwander Sep 1985 A
4549121 Gale Oct 1985 A
4562398 Kotlarewsky Dec 1985 A
4575671 Lee et al. Mar 1986 A
4578609 McCarty Mar 1986 A
4581999 Campagnuolo et al. Apr 1986 A
4591746 Kamiyama May 1986 A
4593289 Newcomb Jun 1986 A
4598240 Gale et al. Jul 1986 A
4599551 Wheatley et al. Jul 1986 A
4601354 Campbell et al. Jul 1986 A
4605874 Whiteley Aug 1986 A
4628219 Troscinski Dec 1986 A
4630817 Buckley Dec 1986 A
4638224 Gritter Jan 1987 A
4639647 Posma Jan 1987 A
4641080 Glennon et al. Feb 1987 A
4642031 Farr Feb 1987 A
4642988 Benson Feb 1987 A
4644233 Suzuki Feb 1987 A
4654066 Garcia et al. Mar 1987 A
4654537 Gaspard Mar 1987 A
4656379 McCarty Apr 1987 A
4658166 Oudet Apr 1987 A
4658346 Templeton Apr 1987 A
4664685 Young May 1987 A
4668885 Scheller May 1987 A
4674199 Lakic Jun 1987 A
4675591 Pleiss Jun 1987 A
4678954 Takeda et al. Jul 1987 A
4682067 Oudet Jul 1987 A
4687945 Ebeling Aug 1987 A
4692675 Falk Sep 1987 A
4698538 Yoshida Oct 1987 A
4698562 Gale et al. Oct 1987 A
4710667 Whiteley Dec 1987 A
4713569 Schwartz Dec 1987 A
4729218 Haselbauer et al. Mar 1988 A
4737070 Horiuchi et al. Apr 1988 A
4739203 Miyao et al. Apr 1988 A
4772842 Ghosh Sep 1988 A
4779038 Eckerfeld Oct 1988 A
4783028 Olson Nov 1988 A
4783038 Gilbert et al. Nov 1988 A
4785228 Goddard Nov 1988 A
4806812 Masterman Feb 1989 A
4809510 Gaspard et al. Mar 1989 A
4811091 Morrison et al. Mar 1989 A
4814651 Elris et al. Mar 1989 A
4819361 Boharski Apr 1989 A
4831300 Lindgren May 1989 A
4835433 Brown May 1989 A
4843270 Dijken Jun 1989 A
4845749 Brickell et al. Jul 1989 A
4851703 Means Jul 1989 A
4862021 Larocca Aug 1989 A
4864151 Wyczalek et al. Sep 1989 A
4866321 Blanchard et al. Sep 1989 A
4872805 Horiuchi et al. Oct 1989 A
4874346 Wachspress Oct 1989 A
4876991 Galitello Oct 1989 A
4879045 Eggerichs Nov 1989 A
4879484 Huss Nov 1989 A
4879501 Haner Nov 1989 A
4884953 Golben Dec 1989 A
4885526 Szabo Dec 1989 A
4890049 Auinger Dec 1989 A
4893040 Turner et al. Jan 1990 A
4904926 Pasichinskyj Feb 1990 A
4906877 Ciaio Mar 1990 A
4914412 Engdahl et al. Apr 1990 A
4927329 Kliman et al. May 1990 A
4933609 Clark Jun 1990 A
4948044 Cacciatore Aug 1990 A
4950973 Kouba Aug 1990 A
4953052 Cartlidge et al. Aug 1990 A
4959605 Vaidya et al. Sep 1990 A
4963780 Hochstrasser Oct 1990 A
4973868 Wust Nov 1990 A
4977529 Gregg et al. Dec 1990 A
4980595 Arora Dec 1990 A
4985875 Mitchell Jan 1991 A
4994700 Bansal et al. Feb 1991 A
5002020 Kos Mar 1991 A
5003209 Huss et al. Mar 1991 A
5003517 Greer Mar 1991 A
5021698 Pullen et al. Jun 1991 A
5030867 Yamada et al. Jul 1991 A
5043592 Hochstrasser Aug 1991 A
5043911 Rashid Aug 1991 A
5047680 Toeroek Sep 1991 A
5053662 Richter Oct 1991 A
5053732 Elgass et al. Oct 1991 A
5057726 Mole et al. Oct 1991 A
5057731 Hancock Oct 1991 A
5058833 Carmouche Oct 1991 A
5065305 Rich Nov 1991 A
5072145 Davis et al. Dec 1991 A
5117142 Von May 1992 A
5120332 Wells Jun 1992 A
5130595 Arora Jul 1992 A
5146146 Saemann Sep 1992 A
5155375 Holley Oct 1992 A
5164826 Dailey Nov 1992 A
5174109 Lampe Dec 1992 A
5184040 Lim Feb 1993 A
5184458 Lampe et al. Feb 1993 A
5191256 Reiter et al. Mar 1993 A
5208498 Hamajima May 1993 A
5220223 Mehnert Jun 1993 A
5220232 Rigney et al. Jun 1993 A
5225712 Erdman Jul 1993 A
5227702 Nahirney Jul 1993 A
5237815 McArthur Aug 1993 A
5237817 Bornemisza et al. Aug 1993 A
5258697 Ford et al. Nov 1993 A
5267129 Anderson Nov 1993 A
5270635 Hoffman et al. Dec 1993 A
5281094 McCarty et al. Jan 1994 A
5283488 Ponnappan et al. Feb 1994 A
5289041 Holley Feb 1994 A
5289072 Lange Feb 1994 A
5306972 Hokanson et al. Apr 1994 A
5317498 Dhyandchand et al. May 1994 A
5336933 Ernster Aug 1994 A
5346370 Krohn Sep 1994 A
5355044 Uchida et al. Oct 1994 A
5369324 Saether Nov 1994 A
5370112 Perkins Dec 1994 A
5371426 Nagate et al. Dec 1994 A
5397922 Paul et al. Mar 1995 A
5400596 Shlien Mar 1995 A
5406186 Fair Apr 1995 A
5409435 Daniels Apr 1995 A
5413010 Sakakibara et al. May 1995 A
5418436 Apuzzo May 1995 A
5427194 Miller Jun 1995 A
5433175 Hughes et al. Jul 1995 A
5448123 Nilson et al. Sep 1995 A
5468378 de la Torre Barreiro Nov 1995 A
5469045 Dove et al. Nov 1995 A
5473205 Haaland Dec 1995 A
5481146 Davey Jan 1996 A
5484120 Blakeley et al. Jan 1996 A
5489290 Furnish Feb 1996 A
5489810 Ferreira et al. Feb 1996 A
5496238 Taylor Mar 1996 A
5504382 Douglass et al. Apr 1996 A
5512811 Latos et al. Apr 1996 A
5517822 Haws et al. May 1996 A
5523635 Ferreira et al. Jun 1996 A
5523637 Miller Jun 1996 A
5530307 Horst Jun 1996 A
5568005 Davidson Oct 1996 A
5594289 Minato Jan 1997 A
5610448 Dattilo Mar 1997 A
5614773 Fabris Mar 1997 A
5619423 Scrantz Apr 1997 A
5625241 Ewing et al. Apr 1997 A
5625276 Scott et al. Apr 1997 A
5626103 Haws et al. May 1997 A
5637934 Fabris Jun 1997 A
5637935 Haaland Jun 1997 A
5641276 Heidelberg et al. Jun 1997 A
5650679 Boggs et al. Jul 1997 A
5653135 Miller et al. Aug 1997 A
5656915 Eaves Aug 1997 A
5659300 Dresselhuys et al. Aug 1997 A
5670861 Nor Sep 1997 A
5682073 Mizuno Oct 1997 A
5689165 Jones et al. Nov 1997 A
5689175 Hanson et al. Nov 1997 A
5690209 Kofoed Nov 1997 A
5696413 Woodbridge et al. Dec 1997 A
5696419 Rakestraw et al. Dec 1997 A
5699218 Kadah Dec 1997 A
5708314 Law Jan 1998 A
5709103 Williams Jan 1998 A
5710474 Mulgrave Jan 1998 A
5715716 Miller et al. Feb 1998 A
5717316 Kawai Feb 1998 A
5719458 Kawai Feb 1998 A
5720194 Miller et al. Feb 1998 A
5726517 Gueraud et al. Mar 1998 A
5731649 Caamano Mar 1998 A
5735123 Ehrig Apr 1998 A
5736838 Dove et al. Apr 1998 A
5744896 Kessinger et al. Apr 1998 A
5747964 Turnbull May 1998 A
5753989 Syverson et al. May 1998 A
5760507 Miller et al. Jun 1998 A
5762584 Daniels Jun 1998 A
5773910 Lange Jun 1998 A
5773962 Nor Jun 1998 A
5775229 Folk et al. Jul 1998 A
5777413 Nagata et al. Jul 1998 A
5784267 Koenig et al. Jul 1998 A
5785137 Reuyl Jul 1998 A
5793137 Smith Aug 1998 A
5799484 Nims Sep 1998 A
5801454 Leininger Sep 1998 A
5806959 Adams et al. Sep 1998 A
5833211 Berling Nov 1998 A
5833440 Berling Nov 1998 A
5838085 Roesel et al. Nov 1998 A
5838138 Henty Nov 1998 A
5839508 Tubel et al. Nov 1998 A
5844342 Taga et al. Dec 1998 A
5844385 Jones et al. Dec 1998 A
5850111 Haaland Dec 1998 A
5850138 Adams et al. Dec 1998 A
5850351 Lotfy et al. Dec 1998 A
5850732 Willis et al. Dec 1998 A
5867004 Drager et al. Feb 1999 A
5874797 Pinkerton Feb 1999 A
5886450 Kuehnle Mar 1999 A
5889348 Muhlberger et al. Mar 1999 A
5892311 Hayasaka Apr 1999 A
5893343 Rigazzi Apr 1999 A
5903113 Yamada et al. May 1999 A
5912522 Rivera Jun 1999 A
5917295 Mongeau Jun 1999 A
5923111 Eno et al. Jul 1999 A
5939813 Schoeb Aug 1999 A
5942829 Huynh Aug 1999 A
5945766 Kim et al. Aug 1999 A
5952756 Hsu et al. Sep 1999 A
5968680 Wolfe et al. Oct 1999 A
5973436 Mitcham Oct 1999 A
5982070 Caamano Nov 1999 A
5982074 Smith et al. Nov 1999 A
5990590 Roesel et al. Nov 1999 A
5997252 Miller Dec 1999 A
5998902 Sleder et al. Dec 1999 A
6002192 Krivospitski et al. Dec 1999 A
6005786 Bluemel et al. Dec 1999 A
6014015 Thorne et al. Jan 2000 A
6020711 Rubertus et al. Feb 2000 A
6027429 Daniels Feb 2000 A
6032459 Skowronski Mar 2000 A
6034463 Hansson Mar 2000 A
6037672 Grewe Mar 2000 A
6037696 Sromin et al. Mar 2000 A
6043579 Hill Mar 2000 A
6047104 Cheng Apr 2000 A
6055163 Wagner et al. Apr 2000 A
6057622 Hsu May 2000 A
6062016 Edelman May 2000 A
6064122 McConnell May 2000 A
6065281 Shekleton et al. May 2000 A
6066898 Jensen May 2000 A
6066906 Kalsi May 2000 A
6081053 Maegawa et al. Jun 2000 A
6082112 Shekleton Jul 2000 A
6086250 Rouhet et al. Jul 2000 A
6087750 Raad Jul 2000 A
6093293 Haag et al. Jul 2000 A
6093986 Windhorn Jul 2000 A
6097104 Russell Aug 2000 A
6100809 Novoselsky et al. Aug 2000 A
6104097 Lehoczky Aug 2000 A
6104115 Offringa et al. Aug 2000 A
6105630 Braun et al. Aug 2000 A
6109222 Glezer et al. Aug 2000 A
6121752 Kitahara et al. Sep 2000 A
6125625 Lipinski et al. Oct 2000 A
6127758 Murry et al. Oct 2000 A
6149410 Cooper Nov 2000 A
6157107 Aoshima et al. Dec 2000 A
6158953 Lamont Dec 2000 A
6166473 Hayasaka Dec 2000 A
6169332 Taylor et al. Jan 2001 B1
6170251 Skowronski et al. Jan 2001 B1
6172429 Russell Jan 2001 B1
6172440 Sasaki et al. Jan 2001 B1
6175210 Schwartz et al. Jan 2001 B1
6177735 Chapman et al. Jan 2001 B1
6178751 Shekleton et al. Jan 2001 B1
6181235 Smith Jan 2001 B1
6189621 Vail Feb 2001 B1
6191561 Bartel Feb 2001 B1
6194802 Rao Feb 2001 B1
6195869 Pullen et al. Mar 2001 B1
6198174 Nims et al. Mar 2001 B1
6199381 Unger et al. Mar 2001 B1
6199519 Van Mar 2001 B1
6211633 Jones et al. Apr 2001 B1
6215206 Chitayat Apr 2001 B1
6218760 Sakuragi et al. Apr 2001 B1
6226990 Conrad May 2001 B1
6242827 Wolf et al. Jun 2001 B1
6242840 Denk et al. Jun 2001 B1
6244034 Taylor et al. Jun 2001 B1
6246138 Nims Jun 2001 B1
6255743 Pinkerton et al. Jul 2001 B1
6265846 Flechsig et al. Jul 2001 B1
6269639 Conrad Aug 2001 B1
6269640 Conrad Aug 2001 B1
6274945 Gilbreth et al. Aug 2001 B1
6274960 Sakai et al. Aug 2001 B1
6275012 Jabaji Aug 2001 B1
6276124 Soh et al. Aug 2001 B1
6279318 Conrad Aug 2001 B1
6279319 Conrad Aug 2001 B1
6284106 Haag et al. Sep 2001 B1
6286310 Conrad Sep 2001 B1
6288467 Lange et al. Sep 2001 B1
6291901 Cefo Sep 2001 B1
6293101 Conrad Sep 2001 B1
6294842 Skowronski Sep 2001 B1
6297977 Huggett et al. Oct 2001 B1
6300689 Smalser Oct 2001 B1
6307278 Nims et al. Oct 2001 B1
6307717 Jeong Oct 2001 B1
6309268 Mabru Oct 2001 B1
6311490 Conrad Nov 2001 B1
6311491 Conrad Nov 2001 B1
6314773 Miller et al. Nov 2001 B1
6329783 Vrionis et al. Dec 2001 B1
6332319 Conrad Dec 2001 B1
6336326 Conrad Jan 2002 B1
6339271 Noble et al. Jan 2002 B1
6345666 Conrad Feb 2002 B1
6348683 Verghese et al. Feb 2002 B1
6362718 Patrick et al. Mar 2002 B1
6363706 Meister et al. Apr 2002 B1
6370928 Chies et al. Apr 2002 B1
6373162 Liang et al. Apr 2002 B1
6373230 Jabaji Apr 2002 B2
6380648 Hsu Apr 2002 B1
6384564 Pollock May 2002 B1
6397946 Vail Jun 2002 B1
6405522 Pont et al. Jun 2002 B1
6407465 Peltz et al. Jun 2002 B1
6411003 Sasaki et al. Jun 2002 B1
6420852 Sato Jul 2002 B1
6435925 Mabru Aug 2002 B1
6438937 Pont et al. Aug 2002 B1
6445101 Ley Sep 2002 B2
6445105 Kliman et al. Sep 2002 B1
6453658 Willis et al. Sep 2002 B1
6454920 Haag et al. Sep 2002 B1
6455964 Nims Sep 2002 B1
6455970 Shaefer et al. Sep 2002 B1
6463730 Keller et al. Oct 2002 B1
6467725 Coles et al. Oct 2002 B1
6470933 Volpi Oct 2002 B1
6479534 Bentley et al. Nov 2002 B1
6483222 Pelrine et al. Nov 2002 B2
6486640 Adams Nov 2002 B2
6501195 Barton Dec 2002 B1
6503056 Eccles et al. Jan 2003 B2
6504281 Smith et al. Jan 2003 B1
6512305 Pinkerton et al. Jan 2003 B1
6518680 McDavid Feb 2003 B2
6526757 MacKay Mar 2003 B2
6528902 Barton Mar 2003 B1
6531799 Miller Mar 2003 B1
6531848 Chitsazan et al. Mar 2003 B1
6538358 Krefta et al. Mar 2003 B1
6541887 Kawamura Apr 2003 B2
6545373 Andres et al. Apr 2003 B1
6546769 Miller et al. Apr 2003 B2
6548925 Noble et al. Apr 2003 B2
6563717 Lunding et al. May 2003 B2
6565243 Cheung May 2003 B1
6566764 Rebsdorf et al. May 2003 B2
6579137 Mabru Jun 2003 B2
6590298 Du Jul 2003 B1
6606864 MacKay Aug 2003 B2
6622487 Jones Sep 2003 B2
6631080 Trimble et al. Oct 2003 B2
6634176 Rouse et al. Oct 2003 B2
6644027 Kelly Nov 2003 B1
6647716 Boyd Nov 2003 B2
6655341 Westerbeke Dec 2003 B2
6657348 Qin et al. Dec 2003 B2
6664688 Naito et al. Dec 2003 B2
6666027 Cardenas Dec 2003 B1
6669416 Klement Dec 2003 B2
6672413 Moore et al. Jan 2004 B2
6675583 Willis et al. Jan 2004 B2
6677685 Pfleger et al. Jan 2004 B2
6679977 Haag et al. Jan 2004 B2
6684642 Willis et al. Feb 2004 B2
6700217 North et al. Mar 2004 B1
6700248 Long Mar 2004 B2
6702404 Anwar et al. Mar 2004 B2
6703719 McConnell Mar 2004 B1
6703747 Kawamura Mar 2004 B2
6707272 Thandiwe Mar 2004 B1
6710469 McDavid Mar 2004 B2
6710491 Wu et al. Mar 2004 B2
6710492 Minagawa Mar 2004 B2
6710502 Maslov et al. Mar 2004 B2
6713936 Lee Mar 2004 B2
6717313 Bae Apr 2004 B1
6720688 Schiller Apr 2004 B1
6724115 Kusase Apr 2004 B2
6727632 Kusase Apr 2004 B2
6731019 Burns et al. May 2004 B2
6732531 Dickey May 2004 B2
6735953 Wolfe et al. May 2004 B1
6737829 Sastry May 2004 B2
6741010 Wilkin May 2004 B2
6756719 Chiu Jun 2004 B1
6759775 Grimm Jul 2004 B2
6765307 Gerber et al. Jul 2004 B2
6766647 Hartzheim Jul 2004 B2
6771000 Kim et al. Aug 2004 B2
6803696 Chen Oct 2004 B2
6853107 Pyntikov et al. Feb 2005 B2
6894411 Schmid et al. May 2005 B2
6894455 Cai et al. May 2005 B2
6897595 Chiarenza May 2005 B1
6901212 Masino May 2005 B2
6956313 El-Gabry et al. Oct 2005 B2
6969927 Lee Nov 2005 B1
7002259 Howes et al. Feb 2006 B2
7081696 Ritchey Jul 2006 B2
7102248 Wobben Sep 2006 B2
7119513 Ishikawa Oct 2006 B2
7126312 Moore Oct 2006 B2
7176654 Meyer et al. Feb 2007 B2
7193391 Moore Mar 2007 B2
7239098 Masino Jul 2007 B2
7248006 Bailey et al. Jul 2007 B2
7250702 Abou et al. Jul 2007 B2
7348764 Stewart et al. Mar 2008 B2
7382103 Shirazee et al. Jun 2008 B2
7391180 Armiroli et al. Jun 2008 B2
7400077 Caroon Jul 2008 B2
7405490 Moehlenkamp Jul 2008 B2
7427849 Kaneko et al. Sep 2008 B2
7482708 Barton et al. Jan 2009 B1
7514834 Takeuchi Apr 2009 B2
7525285 Plett Apr 2009 B2
7545052 Llorente et al. Jun 2009 B2
7554303 Kawamura Jun 2009 B1
7595574 Ritchey Sep 2009 B2
7602158 Iacob Oct 2009 B1
7649274 Burt Jan 2010 B2
7710081 Saban et al. May 2010 B2
7816805 Tanaka et al. Oct 2010 B2
7948141 Takeuchi May 2011 B2
8097970 Hyvaerinen Jan 2012 B2
8106563 Ritchey Jan 2012 B2
8120321 Vezzini et al. Feb 2012 B2
8138620 Wagoner et al. Mar 2012 B2
8212371 Maibach et al. Jul 2012 B2
8212445 Ritchey Jul 2012 B2
8247105 Liu Aug 2012 B2
8278858 Fang et al. Oct 2012 B2
8288992 Kramer et al. Oct 2012 B2
8310198 Kurimoto et al. Nov 2012 B2
8330419 Kim et al. Dec 2012 B2
8368357 Ghantous et al. Feb 2013 B2
8426063 Lin Apr 2013 B2
8427105 Plett Apr 2013 B2
8427106 Kim et al. Apr 2013 B2
8427112 Ghantous et al. Apr 2013 B2
8466595 Spooner Jun 2013 B2
8470464 Troutman Jun 2013 B2
8513921 Berkowitz et al. Aug 2013 B2
8564247 Hintz et al. Oct 2013 B2
8577529 Takahashi et al. Nov 2013 B2
8610383 De Sousa et al. Dec 2013 B2
8614529 Ritchey Dec 2013 B2
8614563 Baughman Dec 2013 B2
8685563 Lin Apr 2014 B1
8729861 Nishida et al. May 2014 B2
8796993 White et al. Aug 2014 B2
8798832 Kawahara et al. Aug 2014 B2
8823296 De Sousa et al. Sep 2014 B2
8917155 Adachi et al. Dec 2014 B2
8928282 Kudo et al. Jan 2015 B2
8988045 Klein et al. Mar 2015 B2
9018898 Ziv et al. Apr 2015 B2
9024586 Vance et al. May 2015 B2
9054533 Gaul et al. Jun 2015 B2
9093864 Abe et al. Jul 2015 B2
9121910 Maluf et al. Sep 2015 B2
9130377 Barsukov et al. Sep 2015 B2
9147910 Chuah et al. Sep 2015 B2
9153845 Tanaka et al. Oct 2015 B2
9153996 De Sousa et al. Oct 2015 B2
9197081 Finberg et al. Nov 2015 B2
9230730 Heins Jan 2016 B2
9365120 Timmons et al. Jun 2016 B2
9379552 Ritchey et al. Jun 2016 B2
9395420 White et al. Jul 2016 B2
9450274 Vo et al. Sep 2016 B2
9496727 Liu et al. Nov 2016 B2
9520613 Brockerhoff Dec 2016 B2
9564763 Finberg et al. Feb 2017 B2
9579961 Harris Feb 2017 B2
9669726 Luo et al. Jun 2017 B2
9705340 Lucea Jul 2017 B2
9787107 Lutze et al. Oct 2017 B2
9812981 Ritchey et al. Nov 2017 B2
9873342 De Sousa et al. Jan 2018 B2
9885757 Liu et al. Feb 2018 B2
9902277 Keller et al. Feb 2018 B2
9948116 Matsumoto et al. Apr 2018 B2
9960611 Toya May 2018 B2
9979211 Barsukov et al. May 2018 B2
10044069 Despesse Aug 2018 B2
10069313 Tkachenko et al. Sep 2018 B2
10073128 Yoshioka et al. Sep 2018 B2
10074997 Vo et al. Sep 2018 B2
10093191 Keller et al. Oct 2018 B2
10103591 Heins Oct 2018 B2
10147983 Kawahara et al. Dec 2018 B2
10222428 Saint-Marcoux et al. Mar 2019 B2
10232716 Higuchi et al. Mar 2019 B2
10256643 Toya Apr 2019 B2
10263435 Kim et al. Apr 2019 B2
10270263 Brozek Apr 2019 B2
10277041 Zane et al. Apr 2019 B2
10291162 Heins May 2019 B1
10298026 Trimboli et al. May 2019 B2
10305298 Kristensen May 2019 B2
10305409 Wang et al. May 2019 B2
10330732 Roumi et al. Jun 2019 B2
10416236 Uchino et al. Sep 2019 B2
10483791 Mergener et al. Nov 2019 B2
10483899 Hustedt Nov 2019 B2
10543303 Zilbershlag et al. Jan 2020 B2
10561775 Zilbershlag Feb 2020 B2
10615610 Jelinek Apr 2020 B1
10644537 Krishnan et al. May 2020 B2
10778014 Barsukov et al. Sep 2020 B2
10833512 Remboski et al. Nov 2020 B2
10910846 Jelinek Feb 2021 B2
10958075 Collins et al. Mar 2021 B2
10958083 Halsey Mar 2021 B2
10985552 Tada et al. Apr 2021 B2
10985587 Matsumura et al. Apr 2021 B2
10992144 Li et al. Apr 2021 B2
10992145 Wang et al. Apr 2021 B2
10992146 Flowers et al. Apr 2021 B2
11005276 Lee et al. May 2021 B2
11095148 Mergener et al. Aug 2021 B2
11128153 Cho et al. Sep 2021 B1
11133680 Wang et al. Sep 2021 B2
11171494 Tang et al. Nov 2021 B2
11277012 Ono et al. Mar 2022 B2
11336104 Poland et al. May 2022 B2
11777329 Osswald et al. Oct 2023 B2
20020012261 Moindron Jan 2002 A1
20020047418 Seguchi et al. Apr 2002 A1
20020057030 Fogarty May 2002 A1
20020070707 Sato Jun 2002 A1
20030047209 Yanai et al. Mar 2003 A1
20040021437 Maslov et al. Feb 2004 A1
20040037221 Aisa Feb 2004 A1
20040174652 Lewis Sep 2004 A1
20040232796 Weissensteiner Nov 2004 A1
20040251761 Hirzel Dec 2004 A1
20050013085 Kinsella et al. Jan 2005 A1
20050024015 Houldsworth et al. Feb 2005 A1
20050052155 Surig Mar 2005 A1
20050099314 Aisa May 2005 A1
20050156574 Sato et al. Jul 2005 A1
20050184689 Maslov et al. Aug 2005 A1
20050212487 Sodeno Sep 2005 A1
20050248440 Stevens Nov 2005 A1
20050269989 Geren et al. Dec 2005 A1
20050280264 Nagy Dec 2005 A1
20060022639 Moore Feb 2006 A1
20060022676 Uesaka et al. Feb 2006 A1
20060033475 Moore Feb 2006 A1
20060055377 Okubo et al. Mar 2006 A1
20060056127 Lewis Mar 2006 A1
20060092583 Alahmad et al. May 2006 A1
20060097698 Plett May 2006 A1
20060232069 Lim et al. Oct 2006 A1
20060273766 Kawamura Dec 2006 A1
20070008669 Al-Haddad Jan 2007 A1
20070073445 Llorente et al. Mar 2007 A1
20070182273 Burt Aug 2007 A1
20070210733 Du et al. Sep 2007 A1
20070276547 Miller Nov 2007 A1
20080012538 Stewart et al. Jan 2008 A1
20080088200 Ritchey Apr 2008 A1
20080106100 Hyvarinen May 2008 A1
20080116759 Lin May 2008 A1
20080116847 Loke et al. May 2008 A1
20080266742 Henke et al. Oct 2008 A1
20090027006 Vezzini et al. Jan 2009 A1
20090066291 Tien et al. Mar 2009 A1
20090078481 Harris Mar 2009 A1
20090079397 Ibrahim Mar 2009 A1
20090167247 Bai et al. Jul 2009 A1
20090208837 Lin Aug 2009 A1
20090251100 Incledon et al. Oct 2009 A1
20090267414 Kiyohara et al. Oct 2009 A1
20100019593 Ritchey Jan 2010 A1
20100073970 Abolhassani et al. Mar 2010 A1
20100090553 Ritchey Apr 2010 A1
20100207580 Nishida et al. Aug 2010 A1
20100244781 Kramer et al. Sep 2010 A1
20100244847 Kudo et al. Sep 2010 A1
20100259219 Yokomizo et al. Oct 2010 A1
20100261043 Kim et al. Oct 2010 A1
20100261048 Kim et al. Oct 2010 A1
20100305792 Wilk et al. Dec 2010 A1
20110057617 Finberg et al. Mar 2011 A1
20110078470 Wang et al. Mar 2011 A1
20110089897 Zhang et al. Apr 2011 A1
20110127960 Plett Jun 2011 A1
20110169454 Maruyama et al. Jul 2011 A1
20110241630 Ritchey et al. Oct 2011 A1
20110260687 Kudo et al. Oct 2011 A1
20110266806 Numajiri Nov 2011 A1
20120013304 Murase et al. Jan 2012 A1
20120065824 Takahashi et al. Mar 2012 A1
20120074898 Schwartz Mar 2012 A1
20120091964 Vance et al. Apr 2012 A1
20120094150 Troutman Apr 2012 A1
20120112688 Ho May 2012 A1
20120194403 Cordier et al. Aug 2012 A1
20120206105 Nishizawa et al. Aug 2012 A1
20120229060 Ritchey et al. Sep 2012 A1
20120239214 Nakashima et al. Sep 2012 A1
20120256592 Baughman Oct 2012 A1
20120274331 Liu et al. Nov 2012 A1
20120319493 Kim et al. Dec 2012 A1
20130002182 Bates et al. Jan 2013 A1
20130002183 Bates et al. Jan 2013 A1
20130002201 Bodkin et al. Jan 2013 A1
20130009595 Brown Jan 2013 A1
20130020979 Bates et al. Jan 2013 A1
20130026989 Gibbs et al. Jan 2013 A1
20130026993 Hintz et al. Jan 2013 A1
20130033231 Zhang Feb 2013 A1
20130065093 White et al. Mar 2013 A1
20130069598 Tanaka et al. Mar 2013 A1
20130169234 Chuah et al. Jul 2013 A1
20130175954 Astigarraga et al. Jul 2013 A1
20130175966 Astigarraga et al. Jul 2013 A1
20130207599 Ziv et al. Aug 2013 A1
20130257382 Field et al. Oct 2013 A1
20140015488 Despesse Jan 2014 A1
20140021924 Abe et al. Jan 2014 A1
20140077752 Barsukov et al. Mar 2014 A1
20140103850 Frank Apr 2014 A1
20140145684 Liu et al. May 2014 A1
20140167708 Ritchey Jun 2014 A1
20140167780 White et al. Jun 2014 A1
20140252922 Ritchey et al. Sep 2014 A1
20140253271 Heins Sep 2014 A1
20140287278 Despesse Sep 2014 A1
20140292283 Timmons et al. Oct 2014 A1
20140312828 Vo et al. Oct 2014 A1
20140327407 Lucea Nov 2014 A1
20140347903 Ritchey et al. Nov 2014 A1
20140361743 Lin et al. Dec 2014 A1
20140363881 Caiafa et al. Dec 2014 A1
20140368168 Beckman Dec 2014 A1
20150028817 Brockerhoff Jan 2015 A1
20150102779 Schumacher et al. Apr 2015 A1
20150219721 Yang et al. Aug 2015 A1
20150231985 Li Aug 2015 A1
20150244313 McNamara et al. Aug 2015 A1
20150280466 Owen et al. Oct 2015 A1
20150380959 Chang et al. Dec 2015 A1
20160043579 Finberg et al. Feb 2016 A1
20160072316 Barsukov et al. Mar 2016 A1
20160089994 Keller et al. Mar 2016 A1
20160111900 Beaston et al. Apr 2016 A1
20160134210 Bock et al. May 2016 A1
20160190830 Kuhlmann et al. Jun 2016 A1
20160241054 Matsumoto et al. Aug 2016 A1
20160254683 Matsumoto et al. Sep 2016 A1
20160336764 Becker et al. Nov 2016 A1
20160336765 Trimboli et al. Nov 2016 A1
20160336767 Zane et al. Nov 2016 A1
20160351976 Kawahara et al. Dec 2016 A1
20170016961 Lucea Jan 2017 A1
20170054306 Vo et al. Feb 2017 A1
20170104347 Shimonishi et al. Apr 2017 A1
20170146609 Uchino et al. May 2017 A1
20170214253 Kim et al. Jul 2017 A1
20170264110 Toya Sep 2017 A1
20170271893 Brozek Sep 2017 A1
20170299660 Saint-Marcoux et al. Oct 2017 A1
20170346334 Mergener et al. Nov 2017 A1
20180008760 Zilbershlag et al. Jan 2018 A1
20180019694 Spickard Jan 2018 A1
20180056798 Syouda Mar 2018 A1
20180062402 Syouda Mar 2018 A1
20180123357 Beaston et al. May 2018 A1
20180134168 Keller et al. May 2018 A1
20180145520 Sasaki et al. May 2018 A1
20180219390 Tkachenko et al. Aug 2018 A1
20180226810 Barsukov et al. Aug 2018 A1
20180241227 Halsey Aug 2018 A1
20180278146 Guven et al. Sep 2018 A1
20180301929 Krishnan et al. Oct 2018 A1
20180337536 Li et al. Nov 2018 A1
20180339093 Zilbershlag Nov 2018 A1
20180366959 Coenen Dec 2018 A1
20190103750 Kristensen Apr 2019 A1
20190115849 Götz Apr 2019 A1
20190148952 Remboski et al. May 2019 A1
20190229540 Lee et al. Jul 2019 A1
20190273380 Collins et al. Sep 2019 A1
20190280488 Tang et al. Sep 2019 A1
20190288526 Jaensch et al. Sep 2019 A1
20190299799 Hinterberger et al. Oct 2019 A1
20190334354 Mizukami et al. Oct 2019 A1
20190393696 Tada et al. Dec 2019 A1
20200036047 Aikens et al. Jan 2020 A1
20200044459 Lee et al. Feb 2020 A1
20200052524 Mergener et al. Feb 2020 A1
20200099110 Lin Mar 2020 A1
20200122580 Zou et al. Apr 2020 A1
20200144952 Mao et al. May 2020 A1
20200203961 Flowers et al. Jun 2020 A1
20200220364 Wang et al. Jul 2020 A1
20200244076 Wang et al. Jul 2020 A1
20200274203 Kirleis et al. Aug 2020 A1
20200274368 Crouse Aug 2020 A1
20200274371 Kirleis et al. Aug 2020 A1
20200274386 Kirleis et al. Aug 2020 A1
20200321788 Ono et al. Oct 2020 A1
20200373801 Kinjo Nov 2020 A1
20200381925 Jelinek Dec 2020 A1
20200403420 Nagase et al. Dec 2020 A1
20200412159 Snyder et al. Dec 2020 A1
20210013784 Shirazee Jan 2021 A1
20210044119 Poland et al. Feb 2021 A1
20210075230 Ono et al. Mar 2021 A1
20210083506 Rao et al. Mar 2021 A1
20210098996 Ono et al. Apr 2021 A1
20210098998 Eo Apr 2021 A1
20210135489 Stites-Clayton et al. May 2021 A1
20210234380 Ono et al. Jul 2021 A1
20210249873 Despesse et al. Aug 2021 A1
20210257947 Kinjo Aug 2021 A1
20210273461 Lin et al. Sep 2021 A1
20210296912 Cho et al. Sep 2021 A1
20210302505 Worry et al. Sep 2021 A1
20210313830 Dowler et al. Oct 2021 A1
20220060029 Syouda et al. Feb 2022 A1
20220216728 Ashman et al. Jul 2022 A1
20220407334 Kouda et al. Dec 2022 A1
Foreign Referenced Citations (56)
Number Date Country
2018101036 Oct 2018 AU
PI0415663 Dec 2006 BR
1038918 Sep 1978 CA
2341095 Oct 2001 CA
2459126 Apr 2003 CA
2543354 Dec 2014 CA
1082740 Apr 2002 CN
101582672 Nov 2009 CN
102148111 Aug 2011 CN
102484448 May 2012 CN
202841012 Mar 2013 CN
107683554 Feb 2018 CN
19733208 Oct 1998 DE
102006033629 Jan 2008 DE
0613234 Nov 2001 EP
1416604 May 2004 EP
1413046 May 2006 EP
1717946 Nov 2006 EP
1068663 May 2008 EP
1680861 Jan 2009 EP
2797221 Oct 2014 EP
3360795 Aug 2018 EP
2001161098 Jun 2001 JP
2001204198 Jul 2001 JP
3481037 Dec 2003 JP
2004336836 Nov 2004 JP
2006521781 Sep 2006 JP
2007097341 Apr 2007 JP
2009080093 Apr 2009 JP
4790618 Jul 2011 JP
2013247003 Dec 2013 JP
5798015 Aug 2015 JP
1020070082819 Aug 2007 KR
102066323 Jan 2020 KR
9701662 Jun 1998 SE
8100651 Mar 1981 WO
8807782 Oct 1988 WO
9708009 Mar 1997 WO
9808291 Feb 1998 WO
9848290 Oct 1998 WO
2004001949 Dec 2003 WO
2004004109 Jan 2004 WO
2004088832 Oct 2004 WO
2005043740 May 2005 WO
2007098227 Aug 2007 WO
2008067649 Jun 2008 WO
2008091035 Jul 2008 WO
2008119864 Oct 2008 WO
2010057892 May 2010 WO
2010057893 May 2010 WO
2013155601 Oct 2013 WO
2017219136 Dec 2017 WO
2018213919 Nov 2018 WO
2020047663 Mar 2020 WO
2021001046 Jan 2021 WO
2021094744 May 2021 WO
Non-Patent Literature Citations (46)
Entry
International Search Report and Written Opinion dated Jul. 12, 2022 in PCT/CA2022/050620, 15 pages.
Non Final Office Action for U.S. Appl. No. 17/842,217, dated Aug. 8, 2022, 25 pages.
International Search Report and Written Opinion dated Aug. 15, 2022 in PCT/CA2022/050753.
International Search Report and Written Opinion dated Sep. 21, 2022 in PCT/CA2022/050620, 17 pages.
Non Final Office Action for U.S. Appl. No. 17/727,143, dated Aug. 22, 2022, 28 pages.
“New Motor architecture could be a game-changer”, High Power Media Ltd., E-Mobility Engineering, 2021, 6 pages.
“Single Wound and Dual Winding Motor”, Yaskawa America, Models & Ratings, 220v Motor/400V Motor, Standard 200V Series.
“What is Dynamic Torque Switching?”, Info@epropelled.com, 4 pages.
Anders, “Analysis of a gas turbine driven hybrid drive system for heavy vehicles”, Thesis/Dissertation, ETDEWEB, U.S. Department of Energy Office of Scientific and Technical Information, Jul. 1, 1999, 4 pages.
Canadian Examination Report, dated Mar. 3, 2017, for CA 2,773,102, 4 pages.
Canadian Examination Report, dated Nov. 1, 2017, for CA 2,773,040, 4 pages.
Canadian Office Action, for Canadian Application No. 2,487,668, dated Oct. 6, 2011, 4 pages.
Canadian Office Action, for Canadian Application No. 3,061,619, dated Sep. 2, 2021, 4 pages.
Chinese Office Action dated Jan. 29, 2022 for Chinese Application No. 2018800337539, 8 pages (English translation of action).
Eckart Nipp, “Alternative to Field-Weakening of Surface-Mounted Permanent-magnet Motors for Variable-Speed Drives”, IEEE Xplore 1995, 8 pages.
Eckart Nipp, “Permanent Magnet Motor Drives with Switched Stator Windings”, Kungl Tekniska Hogskolan, TRITA-EMD-9905 ISSN-1102-0172, Submitted to the School of Electric Engineering and Information Technology, 1999, 315 pages.
European Examination Report, dated Apr. 18, 2017, for EP 10 814 529.3, 6 pages.
Extended European Search Report, dated Oct. 14, 2020, for EP 18806122, 7 pages.
First Office Action and Search Report (with English Translation) from corresponding CN application No. 201080039251.0, dated Jan. 30, 2014, 16 pages.
Huang, et al., “Electrical Two-Speed Propulsion by Motor Winding Switching and Its Control Strategies for Electric Vehicles” IEEE transactions on Vehicular Technology, vol. 48, No. 2, Mar. 1999, 12 pages.
International Preliminary Report on Patentability and Written Opinion, dated Mar. 6, 2012, for PCT/US2010/047750, 5 pages.
International Preliminary Report on Patentability with Written Opinion dated Nov. 26, 2019, for International Application No. PCT/CA2018/050222, filed Feb. 27, 2018, 6 pages.
International Search Report and Written Opinion, dated Jun. 2, 2020, for PCT/CA2020/050534, 10 pages.
International Search Report and Written Opinion, dated May 24, 2011, for PCT/US2010/047750, 7 pages.
International Search Report and Written Opinion, dated May 8, 2018, for PCT/CA2018/050222, 7 pages.
International Search Report and Written Opinion, dated Nov. 13, 2019, for PCT/CA2019/051239, 9 pages.
International Search Report and Written Opinion, dated Sep. 28, 2007, for PCT/CA2007/001040, 8 pages.
International Search Report for PCT/CA2020/050534, dated Jun. 2, 2020, 4 pages.
Notice of Allowance dated Jun. 15, 2021, for Ritchey, “Variable Coil Configuration System Control, Apparatus and Method,” U.S. Appl. No. 16/615,493, 10 pages.
Tang et al., “A Reconfigurable-Winding System For Electric Vehicle Drive Applications”, 2017 IEEE Transportation Electrification Conference and Expo (ITEC), 6 pages.
Tang, “Electric Motor Performance Improvement Techniques”, 2016 U.S. DOE Vehicle Technologies Office Review, Project ID:EDT071, Oak Ridge National Laboratory, 23 pages.
Written Opinion for PCT/CA2020/050534, dated Jun. 2, 2020, 6 pages.
Villani M., et al., “Fault-tolerant brushless DC drive for aerospace application. In the XIX International Conference on Electrical Machines—ICEM, Sep. 6, 2010”, 1-7.
Maslov, et al. “Low-Speed High-Torque Brushless PM Motor for Propulsion Applicatins With an Advanced Magentic Path Design,” U.S. Appl. No. 60/399,415, filed Jul. 31, 2002, 18 pages.
Babaei, et a;, “New cascaded multilevel inverter topology with minimum number of switches”, Energy Conversion and Management 50 (2009) 2761-2767, 7 pages.
Final Office Action for U.S. Appl. No. 17/727,143, dated Feb. 16, 2023, 26 pages.
Horsche et al., “Realising Serial Hybrid Energy Storage Systems (sHESS) by implementing Switching Circuits on Battery Cell Level”, EVS29 Symposium, Montreal Quebec, Canada, Jun. 19-22, 2016.
International Search Report and Written Opinion for PCT/CA2022/000039, dated Nov. 23, 2022, 12 pages.
Non-Final Office Action Issued in U.S. Appl. No. 17/727,143, dated Jun. 9, 2023, 28 pages.
Notice of Allowance for U.S. Appl. No. 17/605,354, dated Mar. 20, 2023, 12 pages.
Notice of Allowance for U.S. Appl. No. 17/727,143, dated Sep. 20, 2023.
Notice of Allowance for U.S. Appl. No. 17/842,217, dated Apr. 12, 2023, 10 pages.
Speltino, et al., “Cell Equalization In Battery Stacks Through State Of Charge Estimation Polling”, 2010 American Control Conference Marriott Waterfront, Baltimore, MD, USA Jun. 30-Jul. 2, 2010, 6 pages.
Welsh, “A Comparison of Active and Passive Cell Balancing Techniques for Series/Parallel Battery Packs” Thesis, Electrical and Computer Engineering Graduate Program, The Ohio State University, 2009, 115 pages.
Non-Final Office Action Issued in U.S. Appl. No. 17/274,036, mailed Dec. 21, 2023, 15 pages.
Zhang, et al., “A harmonic injection method for improving NVH performance permanent magnet synchronous motor”, Journal of Physics: Conference Series, 1802 (2021) 032132, 6 pages.
Related Publications (1)
Number Date Country
20220368259 A1 Nov 2022 US
Provisional Applications (1)
Number Date Country
63188151 May 2021 US