Compared to traditional lighting systems such as high intensity discharge (HID), high intensity fluorescent (HIF), and high pressure sodium (HPS) lightings that are used in a variety of settings, including large scale facilities such as warehouses, light emitting diodes (LEDs) provide superior performance. Some of the advantages include low energy consumption (with excellent lighting levels), fast switching, long lifetime, etc.
Embodiments of the present invention include a lighting fixture that includes a plurality of light emitting diodes (LEDs) arranged in series, a constant-voltage power supply operably coupled to the LEDs, a sensor in electrical communication with the LEDs, and a bypass circuit operably coupled to the sensor. In operation, the power supply provides a constant voltage across the LEDs. The sensor measures a decrease in the LEDs' temperature; this decrease in temperature causes an increase in series voltage across the LEDs. And the bypass circuit short-circuits at least one LED in response to the increase in the series voltage so as to reduce the series voltage below the constant voltage provided by the constant-voltage power supply.
In some examples, the bypass circuit enables the short-circuited LED for a predetermined period. While the LED is re-enabled, the sensor measures a change in the LEDs' temperature, e.g., for a period of 20 ms or less. If the temperature change indicates that the series voltage remains high, the bypass circuit short-circuits the LED again. Otherwise, the bypass circuit leaves the LED enabled until the temperature drops again. The bypass circuit can also short-circuit at least one LED if the series voltage exceeds a threshold voltage.
Another embodiment comprises an apparatus for illuminating an environment at cold temperature. An exemplary apparatus includes at least one LED, a linear driver circuit operably coupled to the LED, a sensor in electrical and/or thermal communication with the at least one light emitting diode, a processor operably coupled to the to the sensor, and a switch (e.g., one or more transistors) operably coupled to the processor and to the linear driver circuit. In operation, the linear driver circuit provides a drive current to the LED. The sensor detects a variation in the drive current from a predetermined drive current caused by a decrease in temperature of the LED, e.g., based on the LED's temperature. The processor generates a drive current control signal, such a pulse-width modulated digital signal, based on at least in part on the variation measured by the sensor. And the switch controls the drive current provided to the LED by the linear drive circuit in response to the drive current control signal from the processor. The processor may also dim the LED by varying the drive current control signal.
It should be appreciated that all combinations of the foregoing concepts and additional concepts discussed in greater detail below (provided such concepts are not mutually inconsistent) are contemplated as being part of the inventive subject matter disclosed herein. In particular, all combinations of claimed subject matter appearing at the end of this disclosure are contemplated as being part of the inventive subject matter disclosed herein. It should also be appreciated that terminology explicitly employed herein that also may appear in any disclosure incorporated by reference should be accorded a meaning most consistent with the particular concepts disclosed herein.
The skilled artisan will understand that the drawings primarily are for illustrative purposes and are not intended to limit the scope of the inventive subject matter described herein. The drawings are not necessarily to scale; in some instances, various aspects of the inventive subject matter disclosed herein may be shown exaggerated or enlarged in the drawings to facilitate an understanding of different features. In the drawings, like reference characters generally refer to like features (e.g., functionally similar and/or structurally similar elements).
For the cold storage industry, facility lighting has been a significant challenge owing to the subpar performance in refrigerated environments of the main industrial lighting choices, high intensity discharge (HID) and high intensity fluorescent (HIF) lighting fixtures. In general, these lighting systems consume too much energy, generate too much heat, and are expensive to maintain. And low-temperature environments, such as those in cold-storage facilities, exacerbate the disadvantages of HID and HIF lighting.
In contrast, an exemplary smart light-emitting diode (LED) lighting fixture offers consistent performance and durability in all temperature environments. For example, an LED lighting system can frequently cycle on/off without impacting the longevity of the lamp source or fixture, instantly return to full intensity when activated, even in −40° F. chillers, and generate minimal heat during operations, significantly reducing refrigeration loads.
However, an LED's forward voltage has a significant variation with temperature. For example, as shown in
LED drive current also varies with forward voltage as shown in
As explained in greater detail below, each fixture 210 includes a sensor that measures (decreases in) temperature. Each fixture 210 also includes a processor or other circuitry that predicts the corresponding (increase in) LED forward voltage using the LEDs' temperature-voltage relationship at a given current. To compensate for changes in LED forward voltage, the lighting fixtures 210 and 260 include bypass circuits that short circuit one or more of the LEDs in the lighting fixture 210 to reduce the overall forward voltage of the plurality of LEDs. Further, since LEDs are more efficient at producing light at low temperatures (e.g., below 0° C.), so short-circuiting one or more LEDs may not significantly reduce the fixture's light output. In some cases, the bypass circuit may short-circuit the LED(s) to reduce power consumption for a given light output level at a given temperature.
In other cases, the LED fixtures may regulate the current supplied by the driver circuit(s) to the LEDs. For instance, an exemplary LED fixture may include a microcontroller or other processor that determines fluctuations in the LED drive current, possibly by measuring temperature or the current itself. The microcontroller may modulate the drive current by applying a drive current control signal (e.g., a pulse-width modulated signal) to the gate of a bipolar transistor that conducts current from the power supply to the driver or from the driver to the LEDs.
In addition, the LED-based lighting fixtures 210 can deliver light where and when needed, unlike HID and HIF fixtures, in part because of LEDs' fast response times. For instance, the LED fixture 210 may include a processor that increases light output when there is activity 220 in the area 200 and dims the lights when the area 200 is unoccupied as indicated by a signal from an ambient light sensor (not shown). The processor 200 may also brighten or dim the lights in response to a signal from an ambient light sensor to save energy in a process known as “daylight harvesting.” For more information on occupancy- and daylight-based LED control, see, e.g., the following patent documents, each of which is incorporated herein by reference in its respective entirety: U.S. Pat. No. 8,536,802; U.S. Pre-Grant Publication No. 2012/0143357 A1; U.S. Pre-Grant Publication No. 2012/0235579 A1; U.S. Pre-Grant Publication No. 2014/0028199 A1; and International Patent Application No. WO 2013/067389.
Bypass Circuits to Reduce LED Forward Voltage
The linear driver 340 may be optimized for a given temperature (e.g., room-temperature), but fluctuations in ambient temperature may reduce the efficiency of the driver 340 and the LEDs 310. The lighting fixture 300 also includes one or more sensors 360 capable of measuring temperature, voltage overhead, and/or LED current drive may sense the voltage provided for driving the LEDs 310. And the fixture 300 includes a microcontroller 350 or other processor, that determines, based on the sensor measurements, whether there is sufficient voltage to drive the LEDs 310. A bypass circuit 370, shown in
For example, the sensor 360 may be implemented as a fully-integrated digital temperature sensor like the one shown in
If the sensor 360 and/or processor 350 determine that there is not sufficient voltage and/or there is a requirement that the forward voltage should not exceed a prescribed amount (e.g., to protect the integrity of the LEDs), the first LED 310a (or, equivalently, the last LED 310n) may be “bypassed” (e.g., short-circuited) to reduce the overall forward voltage of the LEDs 310. Bypassing one or more of the LEDs reduces the total forward voltage and makes it possible to drive at least some of the LEDs 310 at full current.
In some implementations, the microcontroller 350 may apply a “bypass-circuit” control signal (e.g., a pulse-width-modulated (PWM) digital signal) 380 to a bypass circuit 370 to effect the bypassing of the first LED 310a (or the last LED 310n) in the series 310. This bypass circuit 370 may include a field-effect transistor or switching component in addition to various support components, e.g., as described below with respect to
Once the first LED 310a has been electrically removed (short-circuited) from the series of LEDs 310, it may be checked periodically to determine if there is sufficient voltage available to drive all the LEDs 310. For example, if the temperature has increased, the power supply DC voltage may be adequate to provide a lower forward voltage to drive the LEDs 310. In such embodiments, the microcontroller 350 and bypass-circuit 370 may periodically enable the first LED 310a to check whether normal, un-bypassed operation has become possible. This periodic disabling of the bypass circuit may be performed at a rate too fast to observe with the naked eye, e.g., at a speed of 100 Hz or faster (i.e., a period less than about 20 milliseconds). The fast switching speed leads to an imperceptible flicker of the first LED 310a and possibly of the other LEDs 310 as well. If the measurement shows that the forward voltage has dropped below the supply voltage (e.g., because the temperature has risen), then the bypass circuit may re-enable the first LED 310. Otherwise, the bypass circuit may disable the first LED 310a after the measurement and check the voltage again later (e.g., every 30 seconds, 60 seconds, five minutes, ten minutes, etc.).
With reference to
As explained above, the combined forward voltages of the LEDs 410 in each light bar 490 may exceed the available DC voltage as the ambient temperature drops. In some implementations, the low voltage drivers 440 of some or all of the light bars 410 may serve as sensors that measure the temperature and/or voltage to determine if the forward voltage exceeds the DC voltage available for each light bar 490. For example, if the same amount of forward voltage should be available to each light bar 490 in the lighting fixture 400, the voltage drivers 440 may check to determine if the total forward voltage at each light bar 490 exceeds the total available DC voltage divided by the number of light bars 490 in the lighting fixture 400.
In some embodiments, the lighting fixture 400 includes a digital light agent (DLA) module 450, which may be implemented as a processor, that may determine, upon receiving the sensing measurements from the voltage drivers 440, if the total forward voltages for the light bars 490 have exceeded the apportioned DC voltages. In other embodiments, the voltage drivers 490 may have made such determinations and may transmit the result to the DLA module 450. Once it has been determined that the forward voltages at one or more of the light bars exceed the available DC voltage, and/or the total combined forward voltage of all the LEDs 410 exceeds the power supply DC voltage, the DLA module 450 may signal the voltage drivers to engage bypass circuits 420a-420c (collectively, bypass circuits 420) included in each light bar 490. In some embodiments, when engaged, the bypass circuits 420 may short-circuit at least one LED 410 in each light bar 490 (
Voltage Monitoring for Low-Temperature Operation
In other embodiments, a voltmeter 590 measures the voltage overhead across the plurality of the LEDs and may determine if the forward voltage of the plurality of LEDs exceeds the available DC voltage, and provide the microcontroller with the result. In some embodiments, the sensor 590 may measure the forward voltage of the plurality of LEDs and relay the measured data to the microcontroller 550 for the microcontroller to determine if the DC power supply provides sufficient voltage to drive the LEDs 510. Upon determining that the forward voltage has exceeded the power supply DC voltage and/or another prescribed voltage threshold, the microcontroller 550 applies a “bypass-circuit” control signal 580 (e.g., a pulse-width-modulated (PWM) digital signal) to the bypass circuit 570. This causes the bypass circuit 570 to short-circuit the first LED 510a (or last LED, as an alternative example) in the series as shown in
After the first LED 510a has been short-circuited and the total forward voltage of the remaining plurality of LEDs reduced to or below the DC voltage from the power supply 530, the microcontroller 550 may disable the bypass switch 570 and bring the shorted LED 510a back online periodically to check if there is enough forward voltage to drive all the LEDs 510. For example, the ambient temperature may have increased and the required total forward voltage for the plurality of LEDs including the shorted-out LED may have been reduced to below the DC voltage. In such embodiments, the microcontroller 550 may periodically disable the “bypass circuit” (e.g., switch off the bypass circuit 570) to check whether un-bypassed operation has become possible by, for example, measuring the total forward voltage again with the voltmeter 590. This periodic disabling of the bypass circuit may be performed at a rate too fast to observe with the naked eye, e.g., at a speed of 100 Hz or faster (i.e., a period less than about 20 milliseconds). For example, the bypass circuit may be disabled for a period less than about 20 milliseconds, 10 milliseconds, 5 milliseconds, etc.
Upon receiving the control signals 680a and 680b from the microcontroller 650, the bypass circuits 670a and 670b may short-circuit the associated LED(s). For example, in
If desired, the processor 650 may actuate the bypass circuits 620a and 620b independently. That is, in
Current Monitoring for Low-Temperature Operation
As shown in
In other embodiments, a temperature sensor 760b may provide a measurement of the temperature 760a to the processor 750, which determines if the drive current has deviated from the desired drive current set-point based on the temperature measurement based on values stored in the memory 752. For example, the sensor and/or the microcontroller may use a relationship that relates current with temperature, and based on a temperature measurement from the sensor 760b may be able to determine the drive current at the plurality of LEDs 710.
Upon determining the deviation of the drive current from the drive current set-point, in some embodiments, the processor 750 may apply a drive current control signal (e.g., a pulse-width-modulated (PWM) digital signal) 780 to the bypass circuit 770 to adjust the drive current to the desired value. For example, if the ambient temperature drops and the output current exceeds the desired value, the processor 750 may apply a PWM signal to the transistor 770 in order to reduce the driver current to the set-point level. In some embodiments, the same PWM signal can also be used to dim the LEDs 710, e.g., in response to an occupancy event or a change in the ambient light level.
Compensation for Temperature-Induced LED Drive Voltage Fluctuation
At step 804, the measured drive voltage is compared to a threshold amount (e.g., the DC voltage provided by the voltage source). If the measured drive voltage is under the threshold, the temperature may be periodically monitored to check if the forward voltage remains under the threshold. If the measured forward voltage exceeds the threshold, at step 805, a processor (e.g., a microcontroller) may effectuate the bypassing of at least one of the LEDs in the plurality of LEDs using a bypass circuit. In some embodiments, the bypassing/short-circuiting may electrically isolate the LED and bring the overall forward voltage across the plurality of LEDs under the threshold.
At step 806, the microcontroller may disable the bypass circuit to determine if the LED forward voltage has dropped. For example, the temperature may have increased and the forward voltage required to drive the LEDs at the desired drive current may have decreased below the threshold. In some embodiments, the switching on/off of the bypass circuit may be undertaken at an imperceptible rate to humans. If a measurement of the forward voltage at step 807 shows that the forward voltage still exceeds the threshold, the bypass circuit is re-engaged and at least one LED is short-circuited at step 808. If, on the other hand, the forward voltage has fallen under the threshold, the bypass circuit is left disabled and the ambient temperature is monitored to check the forward voltage remains below the threshold.
At step 904, if the drive current is determined to be acceptable (e.g., the drive current variations are within some acceptable bounds of the desired drive current set-point), the temperature may be periodically monitored to check if the drive current variations remains within the bounds. If, on the other hand, the current variations are not acceptable, a microcontroller may apply, at step 905, a drive current control signal to a transistor and/or a linear driver circuit to keep the current at the desired level of drive current. For example, if a drop in temperature has resulted in an increase of the drive current, the microprocessor may signal the transistor and/or the linear driver to reduce the drive current to the desired level. At step 906, one may determine if the drive current has attained the desired level, and if so, at step 907, the temperature may be periodically monitored to check the drive current maintains at the desired level. If, on the other hand, the drive current has not reached the desired level, the microcontroller may apply additional signal to the transistor and/or linear driver to adjust the drive current at the plurality of LEDs to the desired level.
Bypass Circuits
Temperature Sensors
Conclusion
While various inventive embodiments have been described and illustrated herein, those of ordinary skill in the art will readily envision a variety of other means and/or structures for performing the function and/or obtaining the results and/or one or more of the advantages described herein, and each of such variations and/or modifications is deemed to be within the scope of the inventive embodiments described herein. More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the inventive teachings is/are used. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific inventive embodiments described herein. It is, therefore, to be understood that the foregoing embodiments are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, inventive embodiments may be practiced otherwise than as specifically described and claimed. Inventive embodiments of the present disclosure are directed to each individual feature, system, article, material, kit, and/or method described herein. In addition, any combination of two or more such features, systems, articles, materials, kits, and/or methods, if such features, systems, articles, materials, kits, and/or methods are not mutually inconsistent, is included within the inventive scope of the present disclosure.
The above-described embodiments can be implemented in any of numerous ways. For example, embodiments of designing and making the coupling structures and diffractive optical elements disclosed herein may be implemented using hardware, software or a combination thereof. When implemented in software, the software code can be executed on any suitable processor or collection of processors, whether provided in a single computer or distributed among multiple computers.
Further, it should be appreciated that a computer may be embodied in any of a number of forms, such as a rack-mounted computer, a desktop computer, a laptop computer, or a tablet computer. Additionally, a computer may be embedded in a device not generally regarded as a computer but with suitable processing capabilities, including a Personal Digital Assistant (PDA), a smart phone or any other suitable portable or fixed electronic device.
Also, a computer may have one or more input and output devices. These devices can be used, among other things, to present a user interface. Examples of output devices that can be used to provide a user interface include printers or display screens for visual presentation of output and speakers or other sound generating devices for audible presentation of output. Examples of input devices that can be used for a user interface include keyboards, and pointing devices, such as mice, touch pads, and digitizing tablets. As another example, a computer may receive input information through speech recognition or in other audible format.
Such computers may be interconnected by one or more networks in any suitable form, including a local area network or a wide area network, such as an enterprise network, and intelligent network (IN) or the Internet. Such networks may be based on any suitable technology and may operate according to any suitable protocol and may include wireless networks, wired networks or fiber optic networks.
The various methods or processes (e.g., of designing and making the coupling structures and diffractive optical elements disclosed above) outlined herein may be coded as software that is executable on one or more processors that employ any one of a variety of operating systems or platforms. Additionally, such software may be written using any of a number of suitable programming languages and/or programming or scripting tools, and also may be compiled as executable machine language code or intermediate code that is executed on a framework or virtual machine.
In this respect, various inventive concepts may be embodied as a computer readable storage medium (or multiple computer readable storage media) (e.g., a computer memory, one or more floppy discs, compact discs, optical discs, magnetic tapes, flash memories, circuit configurations in Field Programmable Gate Arrays or other semiconductor devices, or other non-transitory medium or tangible computer storage medium) encoded with one or more programs that, when executed on one or more computers or other processors, perform methods that implement the various embodiments of the invention discussed above. The computer readable medium or media can be transportable, such that the program or programs stored thereon can be loaded onto one or more different computers or other processors to implement various aspects of the present invention as discussed above.
The terms “program” or “software” are used herein in a generic sense to refer to any type of computer code or set of computer-executable instructions that can be employed to program a computer or other processor to implement various aspects of embodiments as discussed above. Additionally, it should be appreciated that according to one aspect, one or more computer programs that when executed perform methods of the present invention need not reside on a single computer or processor, but may be distributed in a modular fashion amongst a number of different computers or processors to implement various aspects of the present invention.
Computer-executable instructions may be in many forms, such as program modules, executed by one or more computers or other devices. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Typically the functionality of the program modules may be combined or distributed as desired in various embodiments.
Also, data structures may be stored in computer-readable media in any suitable form. For simplicity of illustration, data structures may be shown to have fields that are related through location in the data structure. Such relationships may likewise be achieved by assigning storage for the fields with locations in a computer-readable medium that convey relationship between the fields. However, any suitable mechanism may be used to establish a relationship between information in fields of a data structure, including through the use of pointers, tags or other mechanisms that establish relationship between data elements.
Also, various inventive concepts may be embodied as one or more methods, of which an example has been provided. The acts performed as part of the method may be ordered in any suitable way. Accordingly, embodiments may be constructed in which acts are performed in an order different than illustrated, which may include performing some acts simultaneously, even though shown as sequential acts in illustrative embodiments.
All definitions, as defined and used herein, should be understood to control over dictionary definitions, definitions in documents incorporated by reference, and/or ordinary meanings of the defined terms.
The indefinite articles “a” and “an,” as used herein in the specification and in the claims, unless clearly indicated to the contrary, should be understood to mean “at least one.”
The phrase “and/or,” as used herein in the specification and in the claims, should be understood to mean “either or both” of the elements so conjoined, i.e., elements that are conjunctively present in some cases and disjunctively present in other cases. Multiple elements listed with “and/or” should be construed in the same fashion, i.e., “one or more” of the elements so conjoined. Other elements may optionally be present other than the elements specifically identified by the “and/or” clause, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, a reference to “A and/or B”, when used in conjunction with open-ended language such as “comprising” can refer, in one embodiment, to A only (optionally including elements other than B); in another embodiment, to B only (optionally including elements other than A); in yet another embodiment, to both A and B (optionally including other elements); etc.
As used herein in the specification and in the claims, “or” should be understood to have the same meaning as “and/or” as defined above. For example, when separating items in a list, “or” or “and/or” shall be interpreted as being inclusive, i.e., the inclusion of at least one, but also including more than one, of a number or list of elements, and, optionally, additional unlisted items. Only terms clearly indicated to the contrary, such as “only one of” or “exactly one of,” or, when used in the claims, “consisting of,” will refer to the inclusion of exactly one element of a number or list of elements. In general, the term “or” as used herein shall only be interpreted as indicating exclusive alternatives (i.e. “one or the other but not both”) when preceded by terms of exclusivity, such as “either,” “one of,” “only one of,” or “exactly one of.” “Consisting essentially of,” when used in the claims, shall have its ordinary meaning as used in the field of patent law.
As used herein in the specification and in the claims, the phrase “at least one,” in reference to a list of one or more elements, should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements. This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase “at least one” refers, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, “at least one of A and B” (or, equivalently, “at least one of A or B,” or, equivalently “at least one of A and/or B”) can refer, in one embodiment, to at least one, optionally including more than one, A, with no B present (and optionally including elements other than B); in another embodiment, to at least one, optionally including more than one, B, with no A present (and optionally including elements other than A); in yet another embodiment, to at least one, optionally including more than one, A, and at least one, optionally including more than one, B (and optionally including other elements); etc.
In the claims, as well as in the specification above, all transitional phrases such as “comprising,” “including,” “carrying,” “having,” “containing,” “involving,” “holding,” “composed of,” and the like are to be understood to be open-ended, i.e., to mean including but not limited to. Only the transitional phrases “consisting of” and “consisting essentially of” shall be closed or semi-closed transitional phrases, respectively, as set forth in the United States Patent Office Manual of Patent Examining Procedures, Section 2111.03.
This application claims priority to PCT Application No. PCT/US2014/035990; filed on Apr. 30, 2014, entitled “Methods, Apparatuses, and Systems for Operating Light Emitting Diodes at Low Temperature”, which is hereby incorporated herein by reference in its entirety. PCT Application No. PCT/US2014/035990 in turn claims a priority benefit of U.S. Application No. 61/817,671, filed Apr. 30, 2013, and entitled “Methods and Systems for Operating LEDs at Low Temperature,” which application is hereby incorporated herein by reference in its entirety.
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Number | Date | Country | |
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20160050725 A1 | Feb 2016 | US |
Number | Date | Country | |
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61817671 | Apr 2013 | US |
Number | Date | Country | |
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Parent | PCT/US2014/035990 | Apr 2014 | US |
Child | 14927413 | US |