Patent Application
20140346896
N/A
N/A
1. Field of the Invention
This invention relates to the management of electrical energy usage.
2. Description of the Related Art
Since the industrial revolution, the world's consumption of energy has grown at a steady rate. Most power generated and energy consumed is from the combustion of fossil fuels, which is a non-renewable natural resource that is rapidly becoming depleted. As the depletion of Earth's natural resources continues, power generation and energy conservation has become an increasingly important issue with governments in both this country and abroad. In addition, businesses and consumers are also concerned as the costs for such resources are rapidly increasing.
Not only do there exist worldwide concerns with power generation and energy conservation, but there also exist concerns with power distribution, especially in emerging economies. Although power generation and energy conservation are of great importance, the problem of power distribution is also of great concern as it involves existing infrastructure that is usually inadequate for properly distributing power. Moreover, it is not readily suitable to be improved upon.
Electricity for residential and industrial use is typically generated at an electric power generating station, and sent through transmission lines in an electricity grid to a distribution system, which carries the electricity to the consumer. In many parts of the world, electric power supply has not kept up with demand, often resulting in brownouts, and sometimes blackouts. A brownout is a drop in voltage in the electrical power supply, often resulting in dimming of lighting when the voltage sags. Brownout voltages sometimes drop enough to cause appliances or equipment to stop operating. Such appliances or equipment may sustain permanent damage as a result of the low voltage condition.
In extreme occurrences of electric power demand exceeding supply, blackouts may occur. A blackout occurs when the supply voltage cannot be sustained at all, or is reduced to a dangerously low level, such as to cause electric motors to stall and overheat. The times of blackouts are generally known to the electrical company from historical records of heavy demand.
A brownout may be caused by (1) inadequate power generation, (2) insufficient power transmission capacity, and/or (3) insufficient power distribution capacity. Inadequate power generation and insufficient power transmission are easier to remedy than insufficient power distribution capacity. Both power generation demand and power transmission capacity can be calculated and fulfilled comparatively easily within fiscal budgets.
The main obstacle to providing sufficient power to consumers is insufficient power distribution capacity. The need for power distribution capacity cannot be easily planned for or economically implemented. Moreover, as the world population grows, and industrial participation in the world economy increases, the power distribution infrastructure will be increasingly strained or overloaded by the additional loads placed on it. The distribution problems can often be attributed to copper losses within the cabling that forms the distribution infrastructure.
Currently, governmental entities and power companies attempt to remedy brown out occurrences by elevating the AC voltage or adding power shedding generation at appropriate locations on the power grid. This method usually results in a wide disparity of voltages available to consumers in homes and/or business. The voltage increases may range from ten percent to fifteen percent (10%-15%) and, since power is calculated by Voltage2/load, the result of the governmental entities' and power companies' “remedy” can result in increased charges to the consumer of up to twenty-five percent (25%). Thus, rather than conserving energy, governmental entities and power companies are expending energy.
Furthermore, although most appliances and equipment used in businesses and homes are capable of performing, exactly to specification, at the nominal voltage minus ten percent (10%), most energy savings devices do not exploit this feature. Thus, a further potential for energy savings is oftentimes ignored.
A transformer transfers electrical energy from one circuit to another through inductively coupled conductors. A varying current in the first or primary windings creates a varying magnetic flux in the transformer's core, and thus a varying magnetic field through the secondary windings. If a load is connected to the secondary, an electric current will flow in the secondary windings and electrical energy will be transferred from the primary circuit through the transformer to the load. The ratio of the transformer is the number of turns in the secondary windings to the number of turns in the primary windings.
The solution to the power distribution problem often employed is to boost the incoming voltage to allow sensitive appliances to continue operating. One solution has been to use motor driven Variac type transformers that continuously adjust the voltage to the nominal voltage. However, this solution requires mechanical implementation that is prone to failure. A second solution has been to employ electronic solid-state boosters that continuously adjust the voltage to the nominal voltage. However, this solution is expensive and inefficient. A third solution is to use relay switched transformers. The problem with this solution is that the mechanical contacts are prone to failure with the high currents being switched. Finally, manually switched transformers have been tried. This solution is undesirable because it requires a person in attendance, and the transformer can be inadvertently left in the boost position. Each of the above solutions of the past has problems of safety, efficiency, cost, complexity and/or reliability. The solutions of the past that utilize transformers and switching perform the switching on the transformer secondary windings side, where disadvantageous high currents are present. There is also a disadvantageous interruption of current with such prior solutions during the switching period.
A need exists for a system and method to manage energy usage that reduces brown outs, blackouts, and costs.
During a first predetermined time period, such as when blackouts are not anticipated, a digital signal processor (DSP) supplies a predetermined voltage that is less than the AC incoming line voltage or mains input voltage. Phase input connections are provided for inputting analog signals into the device and system. A magnetic flux concentrator or a current transformer senses the incoming analog signal and a volts zero crossing point detector determines the zero volts crossing point of the signal. The positive half cycle and negative half cycle of the signal is identified and routed to the DSP for processing the signal. The signal is reduced by a driver control via pulse width modulation and the reduced amount of energy is outputted, thereby yielding an energy savings for an end user.
A microprocessor measures the AC incoming line voltage, and compares it with the predetermined voltage. When the AC incoming line voltage is higher than the predetermined voltage, the microprocessor controls a switch on the primary windings side of a transformer to short circuit the primary windings. When the measured voltage is less than the predetermined voltage, and voltage increase is needed, such as during a brownout condition, the microprocessor controls the switch to connect one end of the primary windings to neutral, removing the short circuit from the transformer and allowing the secondary voltage to add to the AC incoming line voltage to provide a boosted output voltage to the predetermined voltage through the hot output line of the secondary windings side of the transformer. The secondary windings are not switched.
During a second predetermined time period, such as when blackout conditions are anticipated, the DSP supplies an allocated amount of power. The DSP and/or the microprocessor monitors power consumption, which may be displayed. When the power consumption exceeds the allocated amount of power, the DSP may shut off the power.
Alternatively, when the consumed power exceeds the allocated power, a signal may be sent alerting the need to reduce power usage. The signal may be audible, visible, or other means. The power consumer may reduce the load to meet the allocated power requirement. In one embodiment, wirelessly controlled electrical outlets may be used to selectively reduce the load in response to the signal. If the load has not been adequately reduced after a predetermined amount of time, the DSP may shut off power. The consumer may then reduce some load, and initiate a command to turn on the power. The command may be initiated by changing the condition of a switch, including manually and/or wirelessly. If the load has still not been adequately reduced after the power has been restored, then the DSP may again shut off the power. Alternatively, the DSP may provide another signal that may again alert that the load must be reduced. If the consumed power is not sufficiently reduced after a predetermined amount of time, then the DSP may shut off power for the duration of the second predetermined time period.
Further alternatively, when the consumed power exceeds the allocated power, the DSP may shut off power to predetermined electrical outlets, while providing power to other electrical outlets, to reduce the overall power usage to the allocated power amount. Predetermined consumer preferences may be implemented. The system may use wirelessly controlled electrical outlets that may be automatically shut-down to meet the predetermined power amount. The system may be monitored, operated and adjusted wirelessly.
In the following detailed description, reference will be made to the attached drawings in which:
The terminology used in reference to the numbered components in
With reference to
A predetermined amount of incoming energy 19 having at least one analog signal 20 therein is inputted into the device and system 1 via an inputting means, which is preferably at least one phase input connection 2. A neutral 18 line is also provided in the device and system 1. As shown in
At least one phase input connection 2 is connected to at least one sensing means, which is at least one magnetic flux concentrator 3 that senses the predetermined amount of incoming energy 19. It is also contemplated that at least one current transformer may be used instead of the at least one magnetic flux concentrator 3 for all embodiments. The magnetic flux concentrator 3 galvanically isolates the current of the incoming energy 19 and reports any over-current conditions to a routing means, which is preferably at least one logic device 9. If there are any over-current conditions, then the over-current conditions are simultaneously reported to the logic device 9 and a processing means, which is preferably a digital signal processor 10, wherein the digital signal processor 10 immediately shuts down the device and system 1. This electronic breaker action is intended to safeguard the device and system 1 itself, as well as the terminal equipment used in conjunction with the device and system 1 in the event of a short circuit or overload. Thus, the logic device 9 provides total protection of the power control devices in the event of a software/firmware glitch and/or power line glitch or surge in real-time as the reaction time of the logic device 9 and digital signal processor 10 is preferably 5 μs. The logic device 9 arbitrates between the drive signals applied to the IGBT/FET half cycle control transistors 54 and 58 and the signals applied to the IGBT/FET shunt control transistors 59, 60, 67 and 68. Therefore, it avoids the IGBT/FET half cycle control transistors 54 and 58 and IGBT/FET shunt control transistors 59, 60, 67 and 68 from being simultaneously driven to an on-condition that could lead to the failure of the power control and/or shunt elements. The digital signal processor 10 preferably includes at least one A/D converter 11.
Prior to reporting the analog value of the phase current from the phase input connection 2 to the digital signal processor 10, the magnetic flux concentrator 3 or current transformer first transmits the incoming energy 19 through at least one signal conditioning means, which is preferably at least one analog signal conditioning device 4. After the signal(s) have been conditioned, a method which is described below, the conditioned signals are then sent to a volts zero crossing point determining means, which is preferably at least one volts zero crossing point detector 5, for detecting the point where the AC voltage goes through zero volts relative to neutral 18, which is commonly referred to as a zero crossing point.
After the zero crossing point is detected and if using a three-phase electrical system, the conditioned signal then enters at least one loss detecting means, which is preferably at least one lost phase detection device 6 and at least one phase rotation determination and rotating means, which is preferably at least one phase rotation device 7, so as to prepare the signal for proper inputting into at least one half cycle identifying means, which is preferably at least one half cycle identifier 8, and then the logic device 9 and digital signal processor 10. Details of the half cycle identifier 8 are discussed below.
The power control is executed via at least one voltage reducing means, which preferably includes at least one IGBT/FET drive control 15, in electrical connection with the digital signal processor 10 to reduce the energy a predetermined amount. Prior to the processed signals entering the reducing means, however, the signals may once again be conditioned through at least one analog signal conditioning device 4 so as to clean a signal to remove any spurious signals or transient signals. The command signals to exercise control of the IGBT/FET drive control 15 of the voltage reducing means are determined by the digital signal processor 10 and mitigated by the logic device 9.
The reduced energy 24 then enters at least one magnetic flux concentrator 3 or current transformer and then enters at least one outputting means, which is preferably at least one phase output connection 17, and is outputted to an electrically-operated device for consumption.
The system and device 1 is powered via a powering means, which is preferably a power supply unit 12 in electrical connection with the digital signal processor 10. A resetting means, which is preferably a reset switch 13, is preferably provided to permit a user to reset the device and system 1 as desired. In addition, an indicator means, such as a light emitting diode 14, may be in electrical connection with reset switch 13 so as to alert a user if the device and system 1 needs to be reset.
The device and system 1 may optionally include at least one digital electricity meter 50 and at least one communication means, such as a USB communications interface 25, capable of interfacing with at least one computing device 16 having at least one USB port 74 and at least one window interface 40, via wired or wireless transmission. The USB communications interface 25 permits a user to monitor, display and/or configure the device and system 1 via his/her computing device 16. However, inclusion of the USB communications interface 25 is not necessary in the implementation of the device and system 1. In addition, a real time clock 49 may optionally be incorporated within the digital signal processor 10 of or otherwise connected to the energy savings device and system 1.
A user may determine the operational manner in which to use the energy savings device and system 1, e.g., a user may select how he/she would like to save energy by either inputting the desired RMS value, inputting the desired percentage voltage or inputting the desired percentage savings reduction into a computing device 16. For example, if a user chooses to reduce the incoming voltage by a fixed percentage, the energy savings device and system 1 permits such voltage percentage reduction and automatically lowers the voltage so as to be consistent with a maximum allowed harmonic content by establishing a lower voltage threshold. The lower voltage threshold assures that in lower or brown-out conditions, the system and device 1 does not continue to attempt to reduce the available voltage by the percentage reduction specified.
The housing 27 snaps together and bears on the conductor 28, which is preferably a cable, to ensure that the conductor 28 is held firmly against the housing 27. The housing top half 29 may be formed in various sizes so as to accommodate differing wire gauges. A plurality of apertures 38 of various sizes may be formed when the halves 29 and 30 are snapped together so as to accommodate conductors 28 of various widths. The magnetic flux concentrator 3 provides galvanic isolation of the incoming energy 19, performs accurate current measurement, is adaptable to any range of currents through multiple cable passages located within the housing 27, provides high voltage galvanic isolation, has zero harmonic distortion and superb linearity. In addition, since the current measurement range is determined by mechanical means, no changes are necessary to the printed circuit board 26. The following equation determines the approximate sensitivity:
V
out=0.06*I/(D+0.3 mm)
where I=current in the conductor 28 and D=the distance in mm from the top surface of the magnetic flux concentrator chip 37 to the center of the conductor 28.
Since no electrical connection is made to the measurement target, full galvanic isolation is achieved. Moreover, there is zero insertion loss and, therefore, no heat is dissipated nor energy lost as there is no electrical connection made nor is a shunt or a transformer used.
With reference to
To properly condition the sine wave signal, operational amplifiers 70 are utilized. An operational amplifier 70 is configured as an active, second order, low pass filter to remove or reduce harmonics and any transients or interfering signals that may be present. When utilizing such filter, however, group delay occurs wherein the group delay offsets, in time, the zero crossing of the filtered signal from the actual zero crossing point of the incoming AC sine wave. To remedy the delay, operational amplifiers 70 are provided to allow the phase change necessary to correct the zero crossing point accurately in time as required. The output of the operational amplifiers 70 is the fully conditioned 50/60 Hz sine wave signal that is connected to the A/D converter 11 of the digital signal processor 10 (see
Additional conditioning of the zero cross signal is further performed by a Schmidt buffer 35. Subsequent to the additional signal processing, a very accurate square wave 69 accurate to a few millivolts of the actual volts zero crossing point 21 of the sine wave is produced.
In a three-phase electrical system, the phase rotation may be either A-B-C or A-C-B. To enable the digital signal processor 10 to properly function, the phase rotation must first be ascertained. The comparators 34 are used to detect the volts zero crossing point(s) 21 and report the point(s) 21 to the digital signal processor 10. The digital signal processor 10, in turn, makes the rotational timing through timing logic. Each of the operational amplifiers 70 act as a simple comparator 34 with the input signal, in each case provided by the inverse parallel pairs of diodes 53 in conjunction with the series resistors 63.
The operational amplifiers 70, which are configured as window comparators 34, have separate switching thresholds determined by at least one resistor 63. As shown in
With reference to
The logic device 9 performs the routing function to assure that all signals are appropriate to the instantaneous requirement and polarity of the incoming sine wave 39 and performs the pulse width modulation function so as to assure the safe operation of the energy savings device and system 1, regardless of the state of the digital signal processor 10, presence of noise, interference or transients. The circuitry of the isolator 71, as shown in
Dealing with a resistive load is much less demanding than dealing with a reactive load, in particular, an inductively reactive load. Currently, pulse width modulation (PWM) is defined as modulation of a pulse carrier wherein the value of each instantaneous sample of a modulating wave produces a pulse of proportional duration by varying the leading, trailing, or both edges of a pulse and which is also known as pulse-duration modulation. However, for purposes of this invention and application, PWM is defined as the modulation of a pulse carrier wherein at least one slice is removed from an area under the curve of a modulating wave. When PWM is applied directly to the incoming power, the inductive component reacts when power is removed and attempts to keep the current going and will raise its self-generated voltage until the current finds a discharge path. This circumstance, without the shunt circuitry, would destroy the half cycle control transistors.
Therefore, the logic device 9 is a “supervisor” wherein it takes the appropriate action should the digital signal processor 10 “hang-up”, if there is an over-current condition or if there is a phase loss. In any of these situations, the logic device 9 responds immediately, in real time, to safeguard the half cycle control transistors and shunt devices and the equipment connected to it.
Additionally, the logic device 9 mitigates the complex drive requirements of the IGBT/FET half cycle control transistors 54 and 58 and the IGBT/FET shunt control transistors 59, 60, 67 and 68 and, to an extent, unloads the digital signal processor 10 of this task. Since the logic device 9 controls this function, it may be performed in real time and, therefore, the timing control of the drive requirements can be held to much stricter limits than would be achieved by the digital signal processor 10. The ability to respond in real time is important to the safe, reliable operation of the energy savings device and system 1 of the present invention.
The original shape of the input sine wave is retained and, since modulation can be made high, possibly 10's of KHz, filtering of the output is possible due to the smaller size of the wound components becoming a practical proposition. The overall effect is realized when the root-mean-square value (RMS), which is the square root of the time average of the square of a quantity or, for a periodic quantity, the average is taken over one complete cycle and which is also referred to as the effective value, is correctly measured and the output voltage is seen to be reduced by a percentage similar to the mark space ratio employed. Reduced voltage results in reduced current, thereby resulting in reduced power consumed by an end user.
Since IGBT and FET devices are unipolar in nature, in the case of AC control, it is necessary to provide at least one IGBT/FET drive control 15 to control each half cycle. Furthermore, to avoid reverse biasing, steering diodes are used to route each half cycle to the appropriate device. Additionally, many IGBT and FET devices have a parasitic diode shunting main element wherein connecting two IGBT or FET devices in inverse parallel would result in having two of the parasitic diodes in inverse parallel, thereby rendering the arrangement inoperative as a controlling element.
The diodes 53 are connected across the positive half cycle transistor 54 and the negative half cycle control transistor 58 and works ideally for a purely resistive load or a current-leading reactive load. However, when driving a load with a current lagging power factor, when the current in an inductively reactive component is suddenly removed, as is the case when the modulation occurs, the collapsing magnetic field attempts to keep the current going, similar to an electronic fly-wheel, and produces an EMF that will rise in voltage until it finds a discharge path that will enable release of the energy. With this arrangement, this “back EMF” would cause active components of the half cycle control element to fail. To prevent this from occurring, additional IGBT/FET shunt control transistors 59, 60, 67 and 68 are placed in a shunt configuration.
During the positive half cycle, the positive half cycle control transistor 54 modulates and a diode 53 is active during the complete positive half cycle. The IGBT second shunt control transistor 60 is turned fully on and a diode 53 is active. Therefore, any opposite polarity voltages resulting from the back EMF of the load are automatically clamped.
During the negative half cycle, the other devices comprised in series and shunt networks are activated in a similar manner.
During the switching transitions, a spike may be present which may last for a very short period of time. The spike is clamped by the transorb devices 52, which are capable of absorbing large amounts of energy for a very short period of time and enables vary fast response time. The transorb devices 52 also clamp any mains bourn transient signals due to lightning strikes or other sources that could otherwise damage the active components of the half cycle transistors or shunt transistors. Further, while each half cycle transistor is pulse width modulating, the other half cycle transistor is turned fully on for the precise duration of the half cycle. The duties of these half cycle transistors reverse during the next half cycle. This process provides complete protection against the back EMF signals discussed above. This arrangement is necessary, especially near the zero crossing time when both shunt elements are in transition.
Each of the IGBT/FET half cycle control transistors 54 and 58 and the IGBT/FET shunt control transistors 59, 60, 67 and 68 have insulated gate characteristics that require the devices to be enhanced to enable them to turn on. This enhancement voltage is preferably 12 Volts in magnitude and is preferably supplied by a floating power supply, preferably one for each pair. This is only possible since the IGBT/FET devices are operated in the common emitter mode in the case of the IGBT's and in the common source mode in the case of the FET's; otherwise, four isolated power supplies would be required for each phase. Each of the pairs requires a separate drive signal that is provided by the isolated, optically-coupled drivers 66. These drivers 66 make use of the isolated supplies and serve to very rapidly turn on and turn-off each power device. These drivers 66 are active in both directions, which is necessary since the input capacitance of the power devices are high and have to be actively discharged rapidly at the turn-off point and charged rapidly at the turn-on point.
The problem with direct pulse width modulation is when driving an inductively reactive load as when the IGBT modulates off, there is a back EMF that needs to be clamped. Referring to
Due to modulation of the positive half cycle, a back EMF signal occurs. Since the negative half cycle control transistor 58 is on during this time, the negative back EMF is passed through a diode 53 to be clamped at the simultaneous AC positive half cycle voltage.
Although no modulation is applied to the IGBT first shunt control transistor 59 and the IGBT second shunt control transistor 60, these transistors 59 and 60 work in conjunction with diodes 53 in a similar manner as set forth above.
As shown in
Similarly, as shown in
In summary, there are two clamping strategem used, the first for the positive half cycle and the second for the negative half cycle. During the positive half cycle, when the positive half cycle control transistor 54 is modulated, the negative half cycle control transistor 58 and the second shunt control transistor 60 are on. During the negative half cycle, when the negative half cycle control transistor 58 is modulated, the positive half cycle control transistor 54 and the IGBT first shunt control transistor 59 are on.
The hardware utilized in the IGBT-based and FET-based energy savings device and method 1 of the present invention is identical with the only difference being the IGBT/FET half cycle control transistors 54 and 58 and the IGBT/FET shunt control transistors 59, 60, 67 and 68. The circuitry diagrams of the IGBT-based circuitry
With reference to
The power supply unit 12 is fully-isolated and double-regulated in design. At the input, a rectifier 72 composed of diodes 53 accepts single, bi- and three-phase power. The power is applied to a switching regulator 90 and integrated circuit 62 via a transformer 57. In view of the large voltages existing across the DC terminals, the switching regulator 90 and integrated circuit 62 is supplemented by a FET transistor 73 employed in a StackFET configuration in order to raise its working voltage. The secondary of transformer 57 has a diode 53 and a reservoir capacitor 56. The DC voltage across capacitor 56 is passed via the network resistors 63 and a Zener diode 75 to an optical isolator 65 and finally to the feedback terminals. Use of the optical isolator 65 guarantees galvanic isolation between the input and the supply output (6.4V DC). Finally, the output of the linear voltage regulators 81 (3.3 VA DC) is passed to a operational amplifier 70, which is configured as a unity gain buffer with two resistors 63 that set the split rail voltage. The main neutral is connected to this split rail point and also a zero Ohm resistor. An inductor 78 isolates the supply rail digital (+3.3V) from the analog (3.3 VA) and reduce noise.
Next,
The circuitry of a USB communications interface 25 is shown in
Since the main printed circuit board is not isolated from neutral, it is necessary to galvanically isolate the USB communications interface 25. Use is made of the built-in serial communications feature of the digital signal processor 10 to serially communicate with the communication means 46. Signals, on the user side of the isolation barrier, are applied to an integrated circuit 62, which is a device that takes serial data and translates it to USB data for direct connection to a computing device 16 via a host USB port 74. The host USB 5V power is used to power the communication means 46 and voids the necessity of providing isolated power from the unit. Preferably, there are two activity light emitting diodes 14, that indicate activity on the TX (transmit) and RX (receive) channels. Communications preferably operates at 9600 Baud, which is adequate in view of the small amount of data passed.
Although the inclusion of a communications means is not necessary in the performance of the energy savings device and system 1, it is a feature that permits easier use of the device and system 1.
Finally, with reference to
In the operational field 43, a user may select the manner in which he/she/it desires to conserve energy. The manners include voltage reduction percentage wherein the output Volts is adjusted by a fixed percentage, savings reduction percentage wherein the output Volts is aimed at achieving a savings percentage and voltage regulation wherein the root mean squared Volts output is a pre-set value.
The phase field 44 permits a user to select the phase type used in connection with the energy savings device and system 1, i.e., single phase, bi-phase or three phase.
The startup field 45 permits a user to configure the system and device 1 to randomly start and/or to have a delayed or “soft start” wherein the user input the delay time in seconds in which the system and device will start.
The calibration field 46 permits a user to input the precise calibrations desired and/or to rotate the phases.
The setpoints field 47 displays the settings selected by the user and shows the amount of energy saved by utilizing the energy savings device and system 1 as voltage regulation, voltage reduction percentage or power savings reduction percentage. With respect to percentage voltage reduction, the lower limit RMS is set below the incoming voltage passed therethrough to permit the incoming voltage to be passed through when it is less than or equal to the lower limit voltage. With respect to the percentage savings reduction, the lower limit RMS is set below the incoming voltage passed therethrough.
Indicators 48 are provided on the windows interface 40 display operating current, operating voltage, line frequency, calculated power savings and phase rotation.
A real time clock 49 may be incorporated into the windows interface 40 to allow programming of additional voltage reduction for a predetermined time and a predetermined operational time, e.g., for seasons, days of the week, hours of the day, for a predetermined operational time. In addition, a user may program the energy savings device and system 1 to operate during various times of the day. The real time clock 49 is set through a communications port or fixed to allow the selection of defined seasonal dates and time when, through experience, are known to exhibit power grid overload. During these times, the system allows further reduction of the regulated AC voltage, thereby reducing the load on the grid. Multiple time can be defined each with its own additional percentage reduction or voltage drop.
The digital electricity meter 50 provides a means to log statistical data on power usage, power factor and surges. The digital electricity meter 50 also provides the ability to include capacitors for power factor correction, operates on single, bi and three-phase systems and operates on all world wide voltages. It may be used remotely or locally to disable or enable the user's power supply at will by the provider. In addition, the digital electricity meter 50 may detect when the energy savings device and system 1 has been bridged by an end user attempting to avoid paying for energy consumption wherein the provider is alerted to such abuse. Finally, use of the real time clock 49 permits a user and/or provider to reduce the consumption of power at selected times of a day or for a selected time period, thereby relieving and/or eliminating brown-out conditions.
The transformer primary windings 10A and 10B have first end or first line 12′ connected to hot input terminal 6′ and second end or second line 14′ connected through connector F2 with electronic switch 16′. Switch 16′ allows transformer second line 14′ to either (1) connect with first line 12′ of the transformer primary windings 10A, 10B, thereby short-circuiting the transformer 41′, or (2) connect with neutral line 18′. Connectors (F1, F2, F3) are Faston type connectors. The connectors (F1, F2, F3) allow for the removably plugging in of different current rated transformers allowing for greater or lesser loads. Other types of connectors are also contemplated.
When the transformer primary windings second line 14′ is switched to neutral, the secondary voltage adds to the mains input voltage, thereby providing boosted or increased output voltage at hot output terminal 8′. An electrical load may be connected at hot output terminal 8′, such as a residential, commercial or industrial load. The winding voltage is phased to be additive to the incoming AC line voltage, thereby providing boosted voltage when needed. When the microprocessor 26′ switches to increased or boosted voltage, the boosted voltage may be maintained at the incoming Vrms multiplied by the percentage ratio of the transformer turns ratio.
When switch 16′ is switched to the other condition, state, or position, removing the second line 14′ connection from neutral and connecting it with first line 12′, the transformer primary windings 10A and 10B are short circuited. By creating a short circuit in the non-boosted condition or state, the transformer 41′ is disconnected and does not consume any power. Also, since the primary 10A and 10B is shorted out, and the secondary 2A and 2B is permanently connected between input terminal 6′ and output terminal 8′, there will be substantially no reactive component of current in the secondary side and therefore substantially no inductively reactive losses are incurred during non-boost operation. The only impediments to the passage of the AC power from hot input 6′ to hot output 8′ will be the very small ohmic resistance of the copper or other windings of the secondary windings 2A and 2B.
The switching is advantageously performed on the transformer primary side (10A, 10B). While switching could take place on the secondary side (2A, 2B) of the transformer 41′, disadvantageous high currents would be present. Since the transformer 41′ may have a ratio of ten (10) to one (1), only one-tenth of the current would need be switched in the primary side (10A, 10B) of the transformer 41′. Other transformer ratios are also contemplated. The transformer ratio is the number of turns in the secondary (2A, 2B) to the number of turns in the primary (10A, 10B). In all embodiments, this technique of switching on the primary side allows for the use of smaller more reliable switches for lower current, such as relay devices 20′ and 22′, as compared to much more expensive devices if the switching were to take place at the secondary side (2A, 2B) of the transformer 41′. Also, the switching on the primary side advantageously provides for no interruption of power during the switching period. Although two relay devices 20′ and 22′ are shown, it is also contemplated that there may be more than two of the devices (20′, 22′).
Power supply 24′ (
Microprocessor 26′ (
Other predetermined voltage settings are also contemplated. Other numbers of jumper blocks or headers 32′ are also contemplated. The microprocessor 26′ operates and controls the relay devices 20′ and 22′ according to the selected voltage.
Microprocessor 26′ (
In
Turning to
In
As can now be understood, the same transformer may be used for 120 V and 230 V, with the connections shown in
When switch 58′ is switched to the other state or condition, removing the primary windings second line 84′, 98′ connection from neutral and connecting it with respective first line 82′, 96′, the transformer primary windings (70A, 70B) or (94A, 94B) are short circuited. By creating a short circuit in the non-boosted position, the transformer is disconnected and does not consume any power. Also, since the primary is shorted out, and the secondary is permanently connected between hot input terminal 78′ and hot output terminal 80′, there will be substantially no reactive component of the current on the secondary windings side and therefore substantially no inductively reactive losses during non-boost operation. The only impediments to the passage of the AC power from input 78′ to output 80′ will be the very small ohmic resistance of the copper or other windings of the secondary windings. As with the first embodiment, the switching is advantageously performed on the transformer primary side, which allows for switching with less current. Also, there is substantially no interruption of power during the switching period.
Turning to
In
Switch 58′ functions like a single pole, double throw (SPDT) switch, sometimes referred to as a “changeover switch.” When the respective IGBT device IG1 or IG2 is in an OFF condition, state, or position, then no AC current flows through the respective diode bridge U7, U8. When the respective IGBT device IG1 or IG2 is in an ON condition, state, or position, then AC current flows through the respective diode bridge U7, U8. Microprocessor 56′ measures the AC incoming line voltage, such as in line 100′, and decides the voltage level at which the increased voltage should be employed. Three small jumper blocks or 3×2 header 102′ may allow the selection of the six (6) voltages as shown in Table 1 above and in
The microprocessor 56′ may utilize detection of the zero voltage crossing point of the incoming AC mains voltage. This zero cross detection is used to assure correct timing of the switching of the IGBT devices IG1 and IG2. Zero cross timing eliminates the possibility of both devices IG1 and IG2 being on at the same time.
In
As can now be understood, all switching may be performed at substantially less current on the primary side, such as primary side (10A, 10B) of the transformer 41′, than on the secondary side, such as secondary side (2A, 2B) of transformer 41′. Since the secondary windings are permanently connected, and the boost switching is performed on the primary side, there will be substantially no interruption of electricity during the switching period. This cannot be achieved when switching is performed on the secondary side. Different embodiments of electronic switches (16′, 58′) are employed to short circuit the transformer primary when it is not in use, thereby eliminating the reactive component of the current from the secondary winding side. The transformer is only active during the voltage boost period. The amount of boost or increase may be selected by the transformer ratio. Transformers with different ratios and/or current ratings may be removably connected with the system. The apparatus may be used for universal operation for AC 120 Volts to 250 Volts. The apparatus size may be relatively small. There may be very small thermal dissipation. The apparatus may be cost effective and reliable. The apparatus may be used to supply increased voltage for electric loads, including residential, industrial or commercial.
Although two switching network embodiments are shown in
Managing Electrical Power Usage
The IGBT/FET-based device 1 shown in
The microprocessor 26′ shown in
During a second predetermined period of time, such as when blackout conditions are anticipated, the DSP 10 controls the IGBT/FET-based device 1 shown in
Alternatively, when the consumed power exceeds the allocated power, a signal may be sent alerting the need to reduce power usage. In
Further alternatively, when the consumed power exceeds the allocated power, the DSP may shut off power to predetermined electrical outlets, while providing power to other electrical outlets, to reduce the overall power usage to the allocated power amount. The system may use wirelessly controlled electrical outlets that may be automatically shut-down to meet the predetermined power amount. The system and method may use preset consumer preferences to reduce the power consumed. The system may be monitored, operated and adjusted wirelessly.
Energy allocation, such as described above, allows consumers to enjoy electrical power for key appliances rather than have no power at all. There are many times that this action is necessary where there is insufficient electrical power for all consumers. Under such conditions, the electrical company may desire to provide a reduced or allocated service to all consumers, rather than provide service to some consumers and no service at all to others. The consumer may become part of the solution rather than part of the problem.
Through wireless communication there is the ability to communicate between controllers, adapters, and input devices. The display device may utilize an off the shelf computer, iPad, smart phone, or other input device using a keyboard, touch screen or combination thereof. Other devices are also contemplated. An iPad is available from Apple Inc. of Cupertino, Calif. While an input device may be used to wirelessly monitor, adjust settings, or adjust control parameters, the system may function completely on its own, independent of the input device. Furthermore, the main unit may have full wireless communications to enable remote control of the aforementioned power outlet and adapters. The system may provide full lighting and environment control. The system may allow for a consumer's power usage profile to be input and implemented for power allocation and selective power reduction. The system and method may provide dynamic power allocation.
As can now be understood, the system and method is a conservation power management system that is installed at the point of consumption. The implementation does not require any immediate increase in power generation, nor does it require any immediate enhancement of the power grid. The solution uses an energy management system that saves energy, reduces brown outs and blackouts, and manages usage to reduce costs to the consumer and the electrical generating and distribution company. The management system results in a reduction in copper losses, thereby releasing energy previously wasted as heat and at a financial loss to the electrical company. The conserved energy can be provided to additional consumers, thereby providing additional income to the electrical utility, at no additional costs.
The system and method have at least eight main features: (1) energy conservation and user cost savings, (2) voltage stabilization, (3) uniform electricity costs to consumers, (4) copper loss reduction, (5) hydrocarbon emission mitigation, (6) brownout mitigation, (7) blackout mitigation, and (8) energy allocation.
The system and method provide energy conservation and user cost savings. Electrical power is typically delivered to the consumer at a nominal voltage of 120/127/230 Vrms. This is the target voltage that the electrical company aims to supply. This voltage can disadvantageously fluctuate by plus or minus 10%, or more, within the power company specification, often by a much greater margin. Appliance manufacturers, well aware of the power shortcomings, design their appliances for the low (minus 10%) end of the supply voltage and design the devices to withstand the high (plus 10%) end of the supplied voltage. At the low end, the appliance will perform its task as specified. However, at any voltage above the low voltage, the appliance will be over supplied and will waste electrical energy at a cost to the consumer. The system and method minimize this situation. The invention regulates the AC voltage at the selected low voltage, thereby saving energy.
The system and method provide voltage stabilization. In extreme cases where the delivered voltage falls below the low voltage, the system and method solve this problem by boosting the incoming voltage, such as to allow the voltage regulation to occur. Unlike voltage boosters that are available for single appliances, the boost section of the system maintains the voltage at the low end for the whole home or business. Not only does this improve the quality of service for the consumer, it also allows the removal of unsightly boosters, used in some countries, from the vicinity of specific appliances so equipped.
The system and method provide uniform electricity cost to consumers. In a typical community, the consumers are charged inconsistently for the same amounts of electrical power required, which is a result of inconsistent voltages being supplied to the community. These losses result from copper losses. Electrical conductors impede the flow of electrical current. This shortcoming of all conductors can be planned for, and larger copper conductors can be employed. Increasing the size of the conductor reduces the copper losses. Unfortunately, the existing power distribution networks were not designed to carry the power needs of emerging economies where affluence is accompanied by the desire, on the part of the consumer, to have appliances and entertainment systems to complement the improved life style. The result is that for a community, the power delivered to the consumer closest to the main electricity transformer, has a much higher voltage than that which is delivered to the consumer furthermost removed from the transformer. This unfair situation results in the consumer closest to the transformer paying for more energy than the consumer at the other end, even if both consumers have identical appliances and a similar lifestyle. The product of electrical voltage and current is watts, and higher voltage results in higher wattage. Wattage per hour is what the consumer pays for. This unfair power situation may be resolved by the system and method.
The system and method provide copper loss reduction. Copper losses are the cumulative power distribution losses experienced in all power distribution networks. In most emerging economies the power distribution network is not capable of sustaining the loading imposed when a community attempts to consume quantities of power that the network was not designed for. This situation usually results from an increase in affluence, which is generally accompanied by the ownership of consumer items like air conditioners, central heating, televisions, washers, audio and improved lighting. When the feeder supplying power to the homes in such a community experiences excessive loading, the electrical resistance, present in all conductors, becomes significant, and a portion of the supplied voltage appears across the resistance of the conductor. The product of this voltage together with the current from many consumers causes a power loss (Watts) within the conductor that is dissipated as heat. This represents a major loss of revenue to the electrical company. With the system and method installed and implemented in the homes associated with this section of the network, the power that was otherwise wasted may then be available to other consumers and may result in an improved revenue stream to the electrical company.
The system and method provide hydrocarbon emission mitigation. Hydrocarbon emissions exist when fossil fuels (oil, gas or coal) are used to generate electrical power. The system and method manage the power being consumed with considerable conservation, at the point of consumption. The effect is twofold: first, a reduction in electrical energy results in a reduction in fossil fuel being consumed with the attendant savings of carbon emissions; and second, this can defer the immediate need for additional generation capacity. Either way benefits are accrued and directly affect the carbon bond situation in a positive way.
The system and method provide brownout mitigation. The system and method, just by their implementation, mitigates this problem. However, associated with the system and method is a feature where, at known times susceptible to brownout, the device can be programmed to, automatically, apply an additional percentage of voltage reduction. Under such circumstances, the loading on the network is further reduced and results in further copper loss reduction.
The system and method provide blackout mitigation. The times of blackouts are usually well known to the electrical company. The system and method, at known times susceptible to blackout, automatically monitor the power usage, alert the consumer, and allocate the power such that every consumer gets their rationed amount.
In one embodiment, when the set time is activated and the allocated wattage is being exceeded, an audible warning device alerts the consumer to shed load. Sometime later, if insufficient load has been shed, the system can be automatically shut down. At this point the consumer can shed some load and then change the condition of a switch to bring the system back on line. If insufficient load has been shed, the audible warning device will again alert the consumer to shed more load. If the consumer does not respond, the system may be set to shut down power for the remaining timed period. Other embodiments are contemplated. Various scenarios can be invoked in accordance with the local situation, desires, and needs of the electricity company, at their discretion. Furthermore, wirelessly controlled electrical outlets can be utilized so that the appropriate devices can be automatically shut-down to meet the required load shedding requirements in relation to the allocated power.
The system and method provide energy allocation. Energy allocation described above allows consumers to enjoy electrical power for key appliances rather than have no power at all. There are many times that this action is necessary where there is insufficient electrical power to go around everyone. Under such a scenario, it is fair to provide a reduced service to everyone to an allocated amount rather than provide service to some and no service at all to others. Each consumer is part of the solution rather than part of the problem.
It is to be understood that while embodiments are illustrated, they are not to be limited to the specific form or arrangement of parts herein described and shown. It will be apparent to those skilled in the art that various changes may be made without departing from the scope of the invention and the invention is not be considered limited to what is shown and described in the specification and drawings.
This application is a continuation of co-pending application Ser. No. 13/026,931, which claims the benefit of U.S. Provisional Application No. 61/432,399 filed Jan. 13, 2011, which applications are hereby incorporated by reference for all purposes in their entirety. This application is a continuation-in-part of (1) co-pending U.S. application Ser. No. 12/185,442 filed Aug. 4, 2008, which claims the benefit of U.S. Provisional Application No. 60/964,587 filed Aug. 13, 2007, U.S. Provisional Application No. 60/966,124 filed Aug. 24, 2007, U.S. Provisional Application No. 61/009,844 filed Jan. 3, 2008, U.S. Provisional Application No. 61/009,846 filed Jan. 3, 2008, U.S. Provisional Application No. 61/009,845 filed Jan. 3, 2008, and U.S. Provisional Application No. 61/009,806 filed Jan. 3, 2008; (2) co-pending U.S. application Ser. No. 12/893,539 filed Sep. 29, 2010; and (3) co-pending International Application No. PCT/US10/50714 filed Sep. 29, 2010, all of which applications are hereby incorporated by reference for all purposes in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| 61432399 | Jan 2011 | US | |
| 60964587 | Aug 2007 | US | |
| 60966124 | Aug 2007 | US | |
| 61009844 | Jan 2008 | US | |
| 61009846 | Jan 2008 | US | |
| 61009845 | Jan 2008 | US | |
| 61009806 | Jan 2008 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 13026931 | Feb 2011 | US |
| Child | 14451891 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12185442 | Aug 2008 | US |
| Child | 13026931 | US | |
| Parent | 12893539 | Sep 2010 | US |
| Child | 13026931 | US | |
| Parent | PCT/US10/50714 | Sep 2010 | US |
| Child | 12893539 | US |
