EP2844035A1 - Dispositif d'alimentation d'au moins un consommateur en énergie électrique ou de mise à disposition de puissance électrique pour au moins un consommateur - Google Patents

Dispositif d'alimentation d'au moins un consommateur en énergie électrique ou de mise à disposition de puissance électrique pour au moins un consommateur Download PDF

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Publication number
EP2844035A1
EP2844035A1 EP14153428.9A EP14153428A EP2844035A1 EP 2844035 A1 EP2844035 A1 EP 2844035A1 EP 14153428 A EP14153428 A EP 14153428A EP 2844035 A1 EP2844035 A1 EP 2844035A1
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EP
European Patent Office
Prior art keywords
control circuit
der
output
consumer
oder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14153428.9A
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German (de)
English (en)
Inventor
Andre Sudhaus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elmos Semiconductor SE
Original Assignee
Elmos Semiconductor SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elmos Semiconductor SE filed Critical Elmos Semiconductor SE
Priority to EP14755694.8A priority Critical patent/EP3039945B1/fr
Priority to PCT/EP2014/068176 priority patent/WO2015028511A1/fr
Priority to CN201480047614.3A priority patent/CN105493629B/zh
Priority to KR1020167008045A priority patent/KR102261255B1/ko
Priority to US14/914,270 priority patent/US10136496B2/en
Publication of EP2844035A1 publication Critical patent/EP2844035A1/fr
Priority to HK16107780.1A priority patent/HK1219832A1/zh
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix

Definitions

  • the invention relates to a device for supplying at least one consumer with electrical energy or for providing electrical power for at least one consumer.
  • the LEDs to be supplied are usually in series, rarely parallel connected and are typically powered by a power source.
  • This regulated power source is powered by a power source, typically the board network of a car.
  • the basic idea of the invention is not only to regulate the current, but also to determine the location at which the power loss is obtained by the regulation of the current, by a further control parameter specifying this location of the additional power loss.
  • the invention is based on the recognition that basically a transistor, which is the regulating transistor of a current source, can be considered in the broadest sense as an adjustable resistor. If this transistor has a mean resistance, then a maximum of power drops across the transistor.
  • this transistor can be replaced by another second transistor, which is followed by an external resistor.
  • This second transistor then regulates the current, whereby a part of the control power dissipation does not drop in the second transistor itself, but in the external resistor.
  • the integrated circuit heats up less, since the heating power is obtained outside of the housing in the said external resistance. If a current is required, which has a transistor resistance below the sum of the on-resistance of the second transistor and the external Resistance requires, so again takes over the first transistor, the scheme.
  • the principle can also be applied to more than two current paths.
  • two- as well as multi-dimensionally can be regulated between the current paths.
  • control circuit As regards the essential approach according to the invention, it should be mentioned that potential power losses, which can occur in the control circuit, are converted via an external resistor or other consumer in the form of heat, which is then released to the environment.
  • the control circuit itself, which is designed as an IC, protected from thermal overloads.
  • the control circuit supplies to the consumer via at least two paths the "energy" or power demanded by the consumer.
  • One of these two paths is as low as possible, so connected substantially lossless to the control circuit, namely via the above-mentioned first output of the control circuit, while the second power transmission path has the external resistor.
  • these two power paths are now controlled accordingly, with the electric power being transported from the control circuit to the load exclusively via the first output up to a first limit value.
  • each regulator module power loss is also generated in the form of heat to an extent that is of the magnitude of the electrical power to be provided to the consumer. Depending on the operating point in which the at least one driver of a controller module is located, this generates more or less heat. Thus, if the driver were to enter an operating range due to an increased power requirement of the consumer, generating more power dissipation which could affect the IC in the form of heat, the next regulator module will be added to the consumer for additional power delivery.
  • the distribution of the available electrical power to the controller modules is dependent on the distribution parameters.
  • control circuit 10 It is therefore a device for the regulated supply of at least one consumer 11 with electrical energy by a control circuit 10.
  • the control circuit 10 has at least four terminals 1, 2, 3, 4.
  • a connection 2 is, for example, the ground connection and the reference potential of the control circuit 10 according to the invention, which is part of the device according to the invention.
  • An exemplary consumer 11 has two supply terminals 5, 6. The terminals 5, 6 of the consumer 11 are connected to an output 3 and the ground terminal 2 of the control circuit 10.
  • the control circuit 10 is supplied from a regulated or unregulated energy source 7 at least via its supply voltage terminal 1 and the ground terminal 2 with electrical energy.
  • the second output of the control circuit 4 is electrically connected via a second external resistor R 4 to a first terminal 5 of the load 11.
  • the consumer 11 may also be an almost arbitrary electrical network of several consumers who are part of the consumer 11. For example, it may be in parts or in whole to a series and / or parallel connection of LEDs. It is only important that the supply of at least a portion of the consumer via the terminals 5, 6 takes place.
  • the consumer 11 must have a common reference potential 2 with the control circuit 10 and the power source 7. This connection can be done electrically directly or indirectly via another consumer or another consumer network.
  • the second terminal 6 of the load 11 may be connected directly to the ground terminal 2 of the control circuit 10.
  • a connection via a first external resistor R 3 exists.
  • this first external resistor R 3 has a different value than the second external resistor R 4 , since only then a regulation of the location of the seizure of the control power loss is possible to some extent.
  • one of the external resistors R 3 , R 4 has a value of zero ohms, which in reality corresponds to a value that is very slightly different from zero.
  • such a connection is simply realized as a direct connection, which corresponds for example to a resistance of a few mOhms.
  • the resistors R 3 , R 4 can then be regarded as unequal, if, depending on the material of the resistors, the latter by more than 1% or better more than 2% or better more than 5% or better more than 10% or better more than 25% or better, more than 50% or better more than 100%.
  • Particularly preferred are lead resistances between the first output 3 of the control circuit 10 and the second terminal of the load 6 of less than 10 ohms or better less than 5 ohms or better less than 2 ohms or better less than 1 ohms or better less than 100 mohms.
  • Such low resistors may generally be considered to have a value of near zero ohms within the meaning of this disclosure.
  • the consumer 11 is now supplied with the sum of the two output currents I3 + I4. So that the control circuit 10 can perform its actual core task, namely the regulation of the current through the load 11, it is obvious that the sum of the output currents I 3 + I 4 at the outputs 3, 4 of the control circuit 10 must be regulated. This sum of the output currents I 3 + I 4 must therefore be formed within the control circuit as an actual value. This actual value I 3 + I 4 is then compared in the control circuit with a setpoint I sum , which is predetermined. Both currents I 3, I 4 are then adjusted accordingly in case of deviations between the sum of the output currents I 3 + I 4 and the target value I sum.
  • this "corresponding" readjustment is done, for example, by a proportional control in which the two currents I 3 , I 4 of the two outputs 3, 4 are readjusted by an equal factor.
  • matching the setpoint value I sum with the predetermined summation current I 3 + I 4 may also include more complicated functions than the simple affine mapping described above. It is important that these can be described at least temporarily by a bijective, strictly monotonically increasing function between the desired value I soll and the current sum I 3 + I 4 .
  • the setpoint I sum can be preset externally or fixed in the control circuit 10 as an internal reference current I ref_int .
  • the second essential controllable parameter is the distribution of the sum current I 3 + I 4 to the output currents I 3 , I 4 . Since their sum I 3 + I 4 yes is determined by the said setpoint I sum , only the ratio of the distribution between these currents I 3 , I 4 is determined by at least one control parameter.
  • This division parameter V p can be determined according to various aspects. In the simplest case, this is specified from the outside via an interface. For example, this can be done again via a data interface ST and another register or via a PWM interface, wherein the duty cycle, for example, the division parameter V p or one of the aforementioned analog values I ref_ext again. Much better, however, is the determination of the distribution parameter Vp within the control circuit 10 itself. For this purpose, the control circuit typically has a suitable component which performs this determination of the distribution parameter Vp.
  • this division parameter Vp it initially makes sense to record essential operating parameters of the control circuit 10.
  • This collection does not necessarily have to be permanent. It may be provided for certain operating parameters predetermined times.
  • the measurements can be carried out cyclically or with the aid of a band-limited measuring trigger signal. Then, if the signal has certain conditions, eg. B. fulfilled a zero crossing, a measurement takes place.
  • the latter methodology has the advantage that it is possible that the requirements of electromagnetic compatibility can be observed. However, this depends on the specific application.
  • a multi-dimensional control which regulates both the current sum I 3 + I 4 and the current distribution between the output currents I 3 , I 4 , makes sense, since due to the measurements in particular faulty states can be detected, which for example to shutdown the control circuit by switching off one or more outputs 3, 4 can lead.
  • These past values may be temporarily stored in a suitable analog or digital memory.
  • the analog memories may be a low-pass filter or a sample-and-hold circuit.
  • the device therefore comprises a component, typically a regulator RG, which compares one of the measured values or an intermediate stored reading or a value derived therefrom with an associated setpoint.
  • the comparison is made by the regulator RG in such a way that the controller checks whether said measured value is smaller than the desired value or greater than the desired value.
  • the controller checks whether the measured value is equal to a setpoint. This means that the measured value must lie within a tolerance band around the setpoint. It is therefore more of a target band. Of course, then it makes no sense to evaluate these measured values simultaneously as larger or smaller.
  • one of the output currents I 3 , I 4 , I 8 or one of the output voltages U 3 , U 4 , U 8 or one of the output powers P 3 , P 4 , P 8 or the sum of all or one Part of the output currents I 3 + I 4 , I 3 + I 4 + I 8 or the sum of all or part of the output powers P 3 + P 4 , P 3 + P 4 + P 8 or the operating voltage provided by the power source 7 available U b or the temperature T of the control circuit 10, the temperature T of a portion of the control circuit 10 or the temperature T in the vicinity of the control circuit 10 or the temperature T in the vicinity of at least one consumer 11 or the temperature T in the vicinity of at least one external resistor R 3 , R 4 , R 8 or the temperature T in a coolant or a cooling medium near a resistor R 3 , R 4 , R 8 or a cached value of these values or a variable derived from these values and / or their cached values become
  • the distribution parameter Vp is the operating voltage U b or correlates with it.
  • a division parameter Vp one of the output currents I 3 , I 4 or one of the output voltages U 3 , U 4 or one of the output powers P 3 , P 4 or the sum of all or part of the output currents I 3 + I 4 or the sum of all or part of the output powers P 3 + P 4 or the temperature T of the control circuit 10 or the temperature T of a part of the control circuit 10 or the temperature T in the vicinity of the control circuit 10 or the temperature T in the vicinity of a consumer 11 or the temperature T in the vicinity of a resistance R 3 , R 4 or the temperature T of a coolant or cooling medium in the vicinity of a resistor R 3 , R 4 to use.
  • stored values of these values and / or variables derived from these values or the operating voltage U b can also be used for the regulation.
  • a device not only has components for making these measurements and producing therefrom the said control signals I soll , Vp, but preferably, but not necessarily, also via a component having the function of error monitoring.
  • This outputs at least one error signal S stat which can signal an error.
  • Such an error signal S stat may also be the content of a register or a bit, which is connected via a digital interface, for. B. a data interface ST, can be read and its value is generated by said component.
  • An analogue signaling via special lines is of course also possible.
  • this component should also be able to receive error messages from other systems that are not part of the control circuit.
  • the component should preferably be able to be linked to the error signal of another device according to the invention or another device not according to the invention. This makes it possible, for example, for a fault on a module consisting of control circuit and consumers to be able to switch off all modules connected by chaining. It is particularly advantageous if this chaining is done, for example, by means of a wired-or circuit and a pull-up resistor of the error signal S stat .
  • a characteristic for an "open error” may be, for example, an output current I 3 , I 4 which is less than 10% or 20% or 30% or 40% or 50% of a predetermined target or expected value.
  • a value of less than 30% has been found to be particularly advantageous.
  • an output voltage U 3 , U 4 can be used which is smaller than a predetermined desired value at at least one of the outputs 3, 4 of the control circuit 10.
  • this setpoint depends on the number of LEDs. For example, it may have a value of 0.5V or 0.1V or 1.5V but other values as well.
  • at least one of the resistors R 3 , R 4 has a value of zero ohms or almost zero ohms. This is to be interpreted as having a value of less than 10 ohms or better less than 5 ohms or better less than 2 ohms or better less than 1 ohms or better less than 100 milliohms.
  • a particular form of self-diagnosis of the device according to the invention can take place in that one of the current branches, for example the second terminal 4 of the control circuit 10 is not supplied with power and the voltage at this branch, in this example the second output voltage U 4 , is measured.
  • the state of an LED chain acting as a consumer 11 can be determined more reliably.
  • this measurement represents a disturbance of the operation. Therefore, this measurement, if any, only temporarily and typically only with a certain minimum time interval and, for example, periodically.
  • a possible self-diagnosis in the form of error detection is therefore at least for a possible error only at certain times and not continuously.
  • control circuits 10 for example for RGB light control.
  • three LED chains in red, green and blue are needed.
  • each of these LED chains is powered by a respective device according to the invention with energy.
  • a color sensor MF for this purpose.
  • This typically provides three actual values with which the respective current sums I sum_r , I sum_g and I sum_b can be readjusted .
  • Three values can then be specified as an external setpoint, which are converted by a computer into the setpoints I sum_r , I sum_g and I sum_b , depending on the color model used.
  • an external wiring can be done for example by reference currents I ref_ext_1 , I ref_ext_2 , I ref_ext_3 , which are impressed via external resistors R ref_1 , R ref_2 , R ref_3 .
  • the external resistor R 3 , R 4 , R 4_1 , R 4_ 2 , R 4_ 3 , R 8 it is possible to allow at this operating temperature, which is far above the operating temperatures lie, which are allowed for semiconductors and thus a realization of the control circuit 10 according to the invention as an integrated circuit.
  • the external resistor R 3 , R 4 , R 4_1 , R 4_2 , R 4_3 , R 8 may be mounted at a location other than the control circuit 10.
  • an external resistor R 3, R 4, R 8, R 4_1, R 4_2, R 4_3 mounted or in such a spatial distance from the control circuit 10 is thermally otherwise isolated so that on reaching the maximum intended operating temperature T R of the respective external resistance R 3 , R 4 , R 8 , R 4_1 , R 4_2 , R 4_3, the temperature of the control circuit 10 in the best case by not more than 10 ° C or worse not more than 20 ° C or worse not more than 40 ° C or worse not more than 80 ° C is increased.
  • cooling is particularly effective when the temperature difference between the external resistor and its cooling, such as a coolant or heat sink, is maximized. This can be done by maximizing the allowable operating temperature of the external resistor. It is therefore a feature of one embodiment of the invention, when an external resistor R 3 , R 4 , R 8 , R 4_1 , R 4_2 , R 4_3 in a specification-compliant operating state of the control circuit 10, a temperature of T R of greater than 150 ° C or better than 200 ° C, or better, greater than 250 ° C, or better, greater than 350 ° C, or better, greater than 450 ° C.
  • Fig. 1 shows an exemplary inventive control circuit 10. It has the two outputs 3, 4 and for each of these outputs 3, 4 an associated current source IS 3 , IS 4 , which is controlled by a regulator RG.
  • the current of the first current source IS 3 is passed directly into the first terminal 5 of the consumer 11, in this case an LED chain.
  • the current of the second current source IS 4 is passed through the resistor R 4 and generates there a voltage drop.
  • the output voltages U 3 , U 4 are detected by measuring devices MU 3 , MU 4 and fed to the controller RG as a measured value.
  • the currents I 3 , I 4 are detected by two further measuring devices MI 3 , MI 4 and also supplied to the controller RG as a measured value.
  • the powers P 3 , P 4 are detected by power measuring devices MP 3 , MP 4 and supplied as a measured value to the controller RG.
  • the operating voltage U b is detected by a measuring device MU b and fed as a measured value to the controller RG. Not all of these readings are required for a successful realization. Here only the potential is to be represented.
  • a temperature measuring device measures the temperature T and provides it to the regulator RG.
  • the regulator RG controls the current sources IS 3 , IS 4 with the aid of these measured values and, if appropriate, with the aid of externally obtained control specifications, in this case a desired value I soll , as well as possibly stored and / or derived variables.
  • Fig. 2 Here is contrary to Fig. 1 another resistor R 3 drawn.
  • Fig. 3 points contrary to Fig. 1 a further output 8, which is also connected to the first terminal 5 via an external resistor R 8 .
  • the associated measuring devices MU 8 , MI 8 , MP 8 also supply the respective measured values P 8 , U 8 , I 8 to the controller RG which controls the current sources as a whole.
  • resistor R 8 is chosen to be twice the value of resistor R 4 .
  • Fig. 4 shows an exemplary control circuit for a RGB LED lighting.
  • the control circuits 10_1, 10_2, 10_3 each control an LED chain 11_1, 11_2, 11_3 of a color.
  • the second terminals 4_1, 4_2, 4_3 are each connected via an external resistor R 4_1 , R 4_2 , R 4_3 to the first terminal 5_1, 5_2, 5_3 of the respective LED chain 11_1, 11_2, 11_3.
  • the respective first terminals 3_1, 3_2, 3_3 are connected directly to these.
  • the second terminals 6_1, 6_2, 6_3 of the LED chains 11_1, 11_2, 11_3 are connected to the ground terminal 2 of the device 10.
  • a reference generator RefG makes it possible to set the setpoint values (eg I soll ) of the individual subdevices 10_1, 10_2, 10_3 externally by means of the currents I ref_ext_1 , I ref_ext_2 , I ref_ext_3 . These currents can be set via the resistors R ref_1 , R ref_2 , R ref_3 at voltage specification instead of current specification.
  • a controller CTR controls the entire device. This can be addressed via a data interface ST.
  • the exemplary device has a power supply SUP which processes the unregulated operating voltage U b for use in the control circuit 10.
  • a color controller FR receives from a color sensor MF information about the color composition and the intensity of the radiated light.
  • This information is converted by the color exciter FR into setpoint specifications for the subdevices 10_1, 10_2, 10_3.
  • a color composition and illumination intensity is set that meets a specification.
  • the setpoint specifications of different setpoint sources which have been described above, can be combined with each other, for example, by multiplication in a suitable device, typically the controller RG, to a common setpoint input I sum for the respective sum current I 3 + I 4 , I 3 + I 4 , + I 8 and / or the distribution parameter Vp.
  • An error detection compares the measured values of the measuring instruments of the sub-apparatuses 10_1, 10_2, 10_3 with target prescriptions and / or desired-specification ranges. You can also use past and derived values. If the error detector FD detects an error condition, this is output via an error signal S stat . Of course, an output via the data interface ST is also possible.
  • An internal reference intRef is used to set basic internal parameters.
  • Fig. 5 shows the distribution of power consumption in different operating voltage ranges for a device similar to the Fig. 1 ,
  • the LEDs are not yet fully conductive and limit the total current I 3 + I 4 .
  • the current is gradually taken over by the second current branch at the second terminal 4 with the second external resistor R 4 .
  • the power P R4 which is thereby converted in the resistor R 4 , increases parabolically.
  • the power P LED which is converted in the LEDs, remains largely constant. From a certain operating voltage point, the second output 4 can no longer supply sufficient voltage.
  • Fig. 6 shows the control characteristic of a preferred embodiment of the invention for the power supply of LEDs.
  • This control characteristic is designed so that it has a plurality of operating voltage ranges as a function of the operating voltage U b .
  • the first resistor R 3 has the value zero ohms. If there are several branches, then a resistor should have the value zero.
  • the light emitting diodes (LEDs) do not yet switch on. Therefore, in this operating voltage range, the current through the LEDs and thus the output power increases as a function of the operating voltage U b .
  • the setpoint current I sum is not yet output to the LEDs by the control circuit, since the total current I 3 + I 4 is not limited by the control circuit 10 but by the LEDs, ie the load 11.
  • the first output 3 supplies the entire current.
  • the first output 3 is connected directly to the load 11 in this example.
  • the output current I 4 of the second output 4 which is connected to the load 11 via the second external resistor R 4 , is still 0 A at this operating voltage point. Therefore, the first output 3 must supply the total sum current I 3 + I 4 , because a voltage drop across the second external resistor R 4 at the second output 4 is not desired.
  • the regulator of the current source at the first output 3 in order not to supply more power, would have to lower its parallel to the current source connected internal conductance. This would lead to an increasing power loss in this controller. Therefore, the second output will gradually take over part of the total current I 3 + I 4 . This happens, for example, in such a way that the first output voltage U 3 at the first output 3 of the control circuit 10 and thus the voltage which drops across the LEDs and thus the load 11, is kept constant. This means that the current I 3 + I 4 remains constant through the LEDs.
  • the sum of the output currents I 3 + I 4 is kept constant.
  • the sum current I 3 + I 4 is readjusted by the load 11 and kept constant.
  • the area D is an area which is typically outside the respective specification for the control circuit 10 and therefore only has emergency running characteristics.
  • Fig. 7 shows a circuit arrangement similar to that according to Fig. 1 but with a reduced number of input and output connections. Incidentally, the operation of this circuit is the same as that described above.
  • the consumer 11 is supplied via a total of four power modules.
  • two of these power modules are connected to one terminal of the consumer, each of these power module pairs having a possible low impedance (ideally without effective ohmic resistance) connected to the consumer path and a power path with external resistance.

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  • Control Of Voltage And Current In General (AREA)
EP14153428.9A 2013-08-28 2014-01-31 Dispositif d'alimentation d'au moins un consommateur en énergie électrique ou de mise à disposition de puissance électrique pour au moins un consommateur Withdrawn EP2844035A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP14755694.8A EP3039945B1 (fr) 2013-08-28 2014-08-27 Dispositif d'alimentation d'au moins un consommateur en énergie électrique ou de mise à disposition de puissance électrique pour au moins un consommateur
PCT/EP2014/068176 WO2015028511A1 (fr) 2013-08-28 2014-08-27 Dispositif d'alimentation d'au moins une charge en énergie électrique ou de fourniture de puissance électrique à au moins une charge
CN201480047614.3A CN105493629B (zh) 2013-08-28 2014-08-27 用于给至少一个耗电器提供电能或用于为至少一个耗电器提供电功率的装置
KR1020167008045A KR102261255B1 (ko) 2013-08-28 2014-08-27 적어도 하나의 컨슈머에 전기 에너지를 공급하기 위한 또는 적어도 하나의 컨슈머에 대해 전력을 제공하기 위한 장치
US14/914,270 US10136496B2 (en) 2013-08-28 2014-08-27 Apparatus for supplying electrical energy to a consumer
HK16107780.1A HK1219832A1 (zh) 2013-08-28 2016-07-05 用於給至少個耗電器提供電能或用于爲至少個耗電器提供電功率的裝置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013014661 2013-08-28

Publications (1)

Publication Number Publication Date
EP2844035A1 true EP2844035A1 (fr) 2015-03-04

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EP14153428.9A Withdrawn EP2844035A1 (fr) 2013-08-28 2014-01-31 Dispositif d'alimentation d'au moins un consommateur en énergie électrique ou de mise à disposition de puissance électrique pour au moins un consommateur

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EP (1) EP2844035A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60107372A (ja) * 1983-11-17 1985-06-12 Ricoh Co Ltd Ｌｅｄアレイ光源駆動方法
WO2009035948A1 (fr) * 2007-09-14 2009-03-19 Leadis Technology, Inc. Circuit de commande programmable de diodes électroluminescentes
EP2196887A1 (fr) 2008-12-04 2010-06-16 ELMOS Semiconductor AG Dispositif destiné à commander une charge
EP2416623A2 (fr) * 2010-08-04 2012-02-08 Immense Advance Technology Corp. Nouveau circuit de commande de DEL
US20130049622A1 (en) * 2011-08-31 2013-02-28 Power Integrations, Inc. Load current management circuit
EP2645818A1 (fr) * 2012-03-30 2013-10-02 Nxp B.V. Circuit de commande de DEL

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60107372A (ja) * 1983-11-17 1985-06-12 Ricoh Co Ltd Ｌｅｄアレイ光源駆動方法
WO2009035948A1 (fr) * 2007-09-14 2009-03-19 Leadis Technology, Inc. Circuit de commande programmable de diodes électroluminescentes
EP2196887A1 (fr) 2008-12-04 2010-06-16 ELMOS Semiconductor AG Dispositif destiné à commander une charge
EP2416623A2 (fr) * 2010-08-04 2012-02-08 Immense Advance Technology Corp. Nouveau circuit de commande de DEL
US20130049622A1 (en) * 2011-08-31 2013-02-28 Power Integrations, Inc. Load current management circuit
EP2645818A1 (fr) * 2012-03-30 2013-10-02 Nxp B.V. Circuit de commande de DEL

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