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EP2600694B1 - LED-Treiberschaltung mit konstanter Stromsparbetriebsfläche - Google Patents

LED-Treiberschaltung mit konstanter Stromsparbetriebsfläche Download PDF

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Publication number
EP2600694B1
EP2600694B1 EP11191353.9A EP11191353A EP2600694B1 EP 2600694 B1 EP2600694 B1 EP 2600694B1 EP 11191353 A EP11191353 A EP 11191353A EP 2600694 B1 EP2600694 B1 EP 2600694B1
Authority
EP
European Patent Office
Prior art keywords
led
signal
chain
leds
voltage
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.)
Not-in-force
Application number
EP11191353.9A
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English (en)
French (fr)
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EP2600694A1 (de
Inventor
Bernhard Bachl
Jozef Sulek
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.)
Vossloh Schwabe Deutschland GmbH
Vossloh Schwabe GmbH
Original Assignee
Vossloh Schwabe Deutschland GmbH
Vossloh Schwabe GmbH
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Application filed by Vossloh Schwabe Deutschland GmbH, Vossloh Schwabe GmbH filed Critical Vossloh Schwabe Deutschland GmbH
Priority to EP11191353.9A priority Critical patent/EP2600694B1/de
Publication of EP2600694A1 publication Critical patent/EP2600694A1/de
Application granted granted Critical
Publication of EP2600694B1 publication Critical patent/EP2600694B1/de
Not-in-force 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits

Definitions

  • the invention relates generally to a driver circuitry for driving one or several LEDs and in particular to a driver circuitry for driving one or several LEDs for lighting purposes and/or for high power signalling purposes.
  • Driving circuits are known for providing current to LEDs by using switches and inductors which are periodically charged from a DC source and discharged to LEDs for providing current to them. Basically it is known to control the power supplied to the LEDs.
  • WO 2010/118944 A1 discloses a circuitry of the switched inductor type in which the duty cycle of the switch is regulated for controlling the power to the LED. For doing so a signal representing the mean value of the LED current will be compared with a reference value and the duty cycle of the switch will be adjusted accordingly. Alternatively, the signal can be derived from the voltage across the LED.
  • EP 0 482 520 A1 discloses a current control circuit for an LED that takes account of the temperature dependence of the forward voltage drop across such devices.
  • the inventive LED power supply is basically adapted to supply LED current even if the forward voltage of the LEDs is heavily increased e.g. because of low temperatures. It may have an increased internal voltage DC source having a voltage which is higher than the, under worst conditions, largest expectable forward voltage of the LED or chain of LEDs connected to the supply. Even a safety margin may be present so that the DC voltage may be some volts above the highest expectable forward voltage.
  • the driver circuit comprises a converter circuit of any usable type.
  • a buck-type converter is used for supplying current to the LED or chain of LEDs.
  • the converter circuit can be operated in any suitable way, e.g. in a continuous current mode in which the switch is closed before the freewheeling current of the inductor reached zero. It may also be operated in different modes, e.g. the critical mode in which the switch is closed just when the freewheeling current of the inductor reaches Zero. Alternatively, it may be driven in an intermittent mode in which the switch is closed after a small amount of time in which the current remained zero. No matter what mode is used for operating the converter circuitry it may assume two different operational modes.
  • a first mode is used during regular operation if the forward voltage of the LED or chain of LEDs is within an expected normal range.
  • the converter circuit supplies current having a defined mean value to the LEDs in this first mode of operation.
  • the converter circuit may supply current having a defined root mean square value (RMS) to the LEDs in this first mode of operation.
  • RMS root mean square value
  • the converter circuit may supply current having any other defined characteristic to the LEDs in this first mode of operation, as there is the peak value or the like.
  • the converter circuit may assume a second mode of operation if the forward voltage of the LED or chain of LEDs exceeds a given value.
  • the second mode of operation is defined by supplying a reduced current to the LED or chain of LEDs.
  • a safe operating mode is established. This extends the useful temperature range in which the LEDs may be operated.
  • the LED current may be adjusted such that the LEDs will be safely heated up until reaching sufficient operating temperature and sufficiently low forward voltage.
  • the converter circuit will switch into the first mode of operation if the forward voltage falls below a given reference value.
  • the first mode of operation is a constant current operating mode while the second mode of operation may be a constant power operating mode in the sense explained above. The more the forward voltage exceeds the given reference value the lower will be the LED current. It is noted, however, that the second mode of operation may use different approaches. It is possible, for example, to supply a reduced fixed current to the LEDs which, in the second mode of operation, is considerably lower than the current in the first mode of operation.
  • the DC source voltage is set to a first lower value for operating the driver circuit in the first mode of operation. Further it is preferred to set the DC source to a second higher value for operating the driver circuit in the second mode of operation.
  • the transition may be done stepwise in one single larger or several smaller steps and in a continuous ramping transition process as well. It is also possible to raise the voltage of the DC source in a fixed relation to the LED forward voltage in the second mode of operation. So it is possible to keep constant the difference between the DC source voltage and the LED forward voltage. It is at least possible to keep positive the difference between the DC source voltage and the LED forward voltage.
  • a chain 11 of LEDs 10, 12, 13, 14, 16, 17, 18, 19 connected in series one to another is powered by an inventive driver circuit 20.
  • the LEDs 10 to 19 of the chain 11 may be used to light outside areas or any other sites which are prone to highly varying temperatures as there are warehouses, cooled stores, lights on ships, aircrafts, stacks, wind turbines, cars, motorcycles, bicycles or the like. It is noted, however, that the invention is not restricted to applications mentioned before. To the contrary, it can be applied to all lighting or signalling applications for indoor and/or outdoor use.
  • the chain 11 is powered by the driver circuit 20, which supplies current to the LED chain 11 through lines 21 and 22.
  • the voltage between the two lines 21, 22 is defined by the sum of the forward voltages of all LEDs 10 to 19 of the chain 11.
  • the number of LEDs may be that high that the total forward voltage may exceed 200 volts (e.g. 240 V).
  • further chains of LEDs may be connected in parallel to chain 11.
  • groups of LEDs may be connected in parallel one to another. That, however, does not change anything to the forward voltage which also in those cases may be relatively high and increase with lower temperatures or for other reasons.
  • the driver circuit 20 comprises a DC power source 23, which provides DC voltage on line 21.
  • the other end of the DC voltage source 23 is grounded at 24.
  • DC voltage source 23 may provide a fixed DC voltage which is well above the forward voltage of the chain 11 under all circumstances. This is in particular true if the forward voltage of the LEDs is varying due to external facts like temperature, aging or the like.
  • the DC voltage source 23 may produce a variable voltage which may be low but still exceeding the forward voltage of the chain 11 if the forward voltage has a first lower value, and which DC voltage is rather high if the forward voltage of the chain 11 is increased for one reason or another. So it can always be made sure that the DC voltage at line 21 exceeds the forward voltage of the chain 11 by all means.
  • the DC voltage source 23 may be of any suitable type. Preferably, it is powered by the mains supply or any other source, which can be AC or DC of higher or lower voltage.
  • DC source 23 For connecting with the mains, DC source 23 comprises a mains input 25.
  • Any usable power factor correction circuit (PFC) may be used for generating DC power from the alternating mains voltage.
  • the power factor correction circuit may be from the isolating type if desired. It may comprise a rectifier unit and a step-up converter connected thereto. It may be of the fixed output voltage type. Alternatively, it may comprise a control input 26 for receiving a signal S and will adjust the output DC voltage accordingly.
  • the current for powering the LED chain 11 is supplied by a buck converter 27 drawing current from line 21 through the series connection of the LED chain 11 and an inductor 28.
  • the inductor 28 may be connected to line 22 as illustrated in Figure 1 or be connected to line 21, alternatively. It may as well be split into two inductors connected to lines 21 and 22, accordingly.
  • a diode 29 provides a freewheeling part for the LED current I LED and closes a conductive loop.
  • the buck converter 27 further comprises a switch arrangement 30 comprising a switch for providing a conductive path from line 22 to the ground 24. Further it comprises a drive circuit 31 for controlled closing and opening the switch.
  • the drive circuit 31 of the switching arrangement 30 comprises at least one input I1, which is connected to a current sensing means 32, which is adapted to sense at least a portion of the current I LED flowing through the LED chain 11.
  • Current sensing means 32 may be placed at any suitable branch or node of the circuit.
  • the controller 31 comprises another input I2 for receiving a signal S indicating the forward voltage present at the chain 11.
  • the inventive drive circuit 20 comprises a mode selector unit 33, which is connected to the LED chain 11 and the control input 12.
  • the mode selector unit 33 comprises a differential amplifier unit 34 the inputs of which are connected to both ends of the chain 11 e.g. to lines 21 and 22.
  • the output of the differential amplifier unit 34 is connected to a block 35 which is differential amplifier, for subtraction the reference signal R provided by a block 36 from the output signal V provided by a block 34.
  • the output signal of the block 35 is a signal S* which is supplied to a block 37.
  • Logic block 37 passes the signal S* to its output were it appears as signal S. If the signal S*, however, is smaller as, or equal to, zero the output signal S will be zero too.
  • the signal S is supplied to the control input I2 via line 38 and optionally to control input 26, if present.
  • DC voltage source 23 provides a fairly high voltage of approximately 460 V (DC) or any other suitable value. It is assumed that the forward voltage of the LED chain 11 is well below that value. The forward voltage may be for example 240 V.
  • the driver circuit 20 assumes a first mode I of operation, which is a current controlled mode of operation.
  • the forward voltage across the LED chain 11 is sensed by the differential amplifier unit 34, which presents a respective signal to one input of block 35.
  • Block 35 subtract the reference value R of block 36 from output signal V provided by a block 34. If the output of differential amplifier 34 is smaller than the reference value supplied by block 36 the signal S* is below Zero. If, however, the output of the differential amplifier 34 exceeds the reference value provided by the block 36, the signal S* will be positive and the block 37 will set the signal S equal to S*.
  • the forward voltage across the chain 11 is below a certain limit.
  • the signal V at the output of the differential amplifier 34 is smaller than the reference signal R. Consequently no signal S is present on line 38. In terms of block 37 the signal S is zero.
  • This state characterizes the first mode I of operation.
  • the controller 31 does not receive a significant control signal from block 37.
  • the only thing controller 31 does, is controlling the switch of the buck converter 27 in any suitable way for keeping the average value (or any other feature defining the strength of the current) of the LED current I LED flowing through lines 21 and 22 equal to a desired constant value. Consequently, the first mode I of operation is a current controlled mode.
  • the strength of the current is not dependent in any way from the forward voltage when being in that first mode I of operation. It is noted that the current flowing through the chain 11 is ramping up and down and may be even zero, periodically. However, the mean value thereof is kept constant.
  • the driver circuit 20 assumes a second mode II of operation.
  • the increase of the forward voltage may be due to very low temperature or other reasons.
  • Block 35 will now find the output signal V exceeding the reference value R and present a positive interim signal S* at its output. Consequently, the block 37 presents a positive signal S which is fed to the control input I2 line 38.
  • the buck converter 27 reduces the current fed to the lamp circuit, which is formed by the chain 11 and the inductor 28.
  • the reduction of the current is preferably tuned such that the product of the mean current through the chain 11 and the mean forward voltage is kept to constant desired value.
  • Figure 2 illustrates a signal V provided by a block 34 indicating the voltage across the LED or chain of LEDs, reference signal R provided by a block 36 and their difference S*.
  • Figure 4 illustrates the dependency of the LED current I LED and the forward voltage U LED .
  • the forward voltage U LED exceeds a set value R* the first constant current mode of operation or the second constant power mode of operation is assumed.
  • the output R of the block 36 defines a reference value for the signal V which is related to the forward voltage. The reference value R* however compares directly to the forward voltage.
  • Figure 5 illustrates the behaviour of the LED current I LED dependent from the forward voltage U LED with dramatically reduced power in the second mode II of operation. While the first mode I of operation is equal to the first modes described before the second mode II* reduces the current more than described before. Consequently, the power supplied to the LED chain 11 will stay below limits and not be constant which, however, may be tolerable or even favourable.
  • the line 39 is present according to Figure 1
  • the DC voltage source 23 will keep the DC voltage at line 21 to a somewhat lower value as long as signal S is zero. It will switch the DC voltage to a somewhat higher value at line 21 if the signal S is present and above zero.
  • the voltage of the DC source 23 minus the voltage across the chain 11 will not exceed a set value of e.g. 20V or 30V in any operating state.
  • a set value of e.g. 20V or 30V in any operating state.
  • Figure 6 illustrates the basic structure of the inventive driver circuit 20 using a current i signal for representing the signal S.
  • the current i signal is fed to a current sensing shunt 40 which is used as the current sensing means 32. Both, the current i signal and the LED current I LED are fed through the shunt 40 which is connected to a signal input IS of the buck converter 27.
  • the signal input IS replaces inputs I1 and I2 of the switching arrangement 30 of figure 1 .
  • Further blocks 34, 35 and 37 are unified to one single block in figure 6 .
  • Block 42 of figure 6 transforms the voltage signal into a current signal.
  • the driver circuit 20 In the first mode I of operation the current i signal is zero. Consequently, the shunt 40 senses just the LED current I LED .
  • the driver circuit 20 is in the current control mode.
  • the current i signal If the current i signal is positive the current i signal adds to the LED current I LED so that the buck converter tries to keep constant the sum of the LED current I LED and the current i signal. Consequently, it reduces the LED current I LED .
  • FIG 7 illustrates a somewhat modified embodiment of the driver circuit 20 of figure 6 .
  • the buck converter 27 uses a switch 41 connected in series with the shunt 40.
  • the voltage dropping on the shunt 40 is supplied to the control input IS via a resistor R1.
  • the current i signal is supplied to the same control input IS via a resistor R2.
  • Transforming the signal S into a current i signal is done by U/I converter 42. It uses an operational amplifier in a basically known application.
  • Operational amplifier OPA 1 is rail-to-rail input/output type with single supply voltage which provides on the output OPA 1 the signal S.
  • the blocks 34 , 35 and 37 are built using at least one operational amplifier in a known wiring.
  • two currents are fed into the input IS which currents are the current i signal and another current defined by the voltage across the shunt 40 and the resistor R1.
  • the latter characterizes the LED current. If the current i is zero, the controller 31 will operate the switch 41 in a way for keeping the LED current I LED constant. If, however, the current i adds to the current flowing through the resistor R2 the controller 41 will reduce the current flowing through the LED chain 11. Preferably, the reduction is adjusted such that the power supplied to the LED chain 11 will be kept constant.
  • a drive circuit 20 for powering an LED chain 11 even if the chain presents an unusual high forward voltage drop. This may be due to extraordinary low temperature, connecting more LEDs in the chain, aging or the like. It is considered to raise the DC voltage for powering the LEDs at least if those unusual high voltage drop conditions occur. If so, however, the LED current otherwise kept constant will be reduced in that second mode II of operation. Preferably, the reduction of the LED current is such that the power applied to the LEDs will be kept at a given constant value.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Claims (14)

  1. Treiberschaltung (20) zum Treiben einer LED (10) oder einer Kette von LEDs (11) für Signal- oder Beleuchtungs-zwecke aufweisend:
    eine Wandlerschaltung (27), die dazu eingerichtet ist,
    der LED (10) oder der Kette (11) von LEDs i) in einem ersten Betriebsmodus (I) einen konstanten Strom und ii) in einem zweiten Betriebsmodus (II) einen verringerten Strom bereitzustellen;
    eine Modusauswahleinheit (33) zur Erzeugung eines Signals (i, s), das die Spannung (ULED) über der LED (10) oder der Kette (11) von LEDs angibt, wenn die Spannung (ULED) oder ein davon abgeleitetes Signal (V) einen vorgegebenen Referenzwert (R) überschreitet;
    wobei die Wandlerschaltung (27) einen Eingang (i2, is) aufweist, der mit einer Erfassungsschaltung (34) verbunden ist, um das Signal (i, s) zu empfangen, wobei die Wandlerschaltung (27) in dem ersten Betriebsmodus (I) betrieben wird, wenn das Signal (i, s) angibt, dass die Spannung (ULED) oder das davon abgeleitete Signal (V) unter dem vorgegebenen Referenzwert (R) liegt und wobei die Wandlerschaltung (27) in dem zweiten Betriebsmodus (II) betrieben wird, wenn das Signal (i, s) angibt, dass die Spannung (ULED) oder das davon abgeleitete Signal (V) über dem vorgegebenen Referenzwert (R) liegt.
  2. Treiberschaltung nach Anspruch 1, wobei die Modusauswahleinheit (33) einen Differenzverstärker (34, OPA1) aufweist, der einen ersten Eingang (+) hat, der mit der Anode der LED (10) oder der Kette (11) von LEDs verbunden ist und der einen anderen Eingang (-) hat, der mit der Kathode der LED (10) oder der Kette (11) von LEDs verbunden ist.
  3. Treiberschaltung nach einem der vorhergehenden Ansprüche, wobei die Modusauswahleinheit (33) einen Differenzverstärker (35) aufweist, der zumindest einen Eingang zum Empfang eines Signals (V) aufweist, das proportional zu der Spannung über der LED (10) oder der Kette (11) von LEDs ist und der einen weiteren Eingang zum Empfangen des Referenzsignals (R) aufweist.
  4. Treiberschaltung nach einem der vorhergehenden Ansprüche, wobei ein Modul (37) zum Setzen des Signals (i, s) auf Null vorhanden ist, wenn die Spannung über der LED (10) oder der Kette (11) von LEDs oder das davon abgeleitete Signal (V) den vorgegebenen Wert (R) nicht überschreitet.
  5. Treiberschaltung nach einem der vorhergehenden Ansprüche, wobei ein Modul (37) zum Setzen des Signals (i, s) auf einen positiven Wert ungleich Null vorhanden ist, wenn die Spannung über der LED (10) oder der Kette (11) von LEDs oder das davon abgeleitete Signal (V) den vorgegebenen Wert (R) überschreitet.
  6. Treiberschaltung nach einem der vorhergehenden Ansprüche, wobei ein Modul (37) zum Setzen des Signals (i, s) auf einen Wert vorhanden ist, der proportional zur Differenz zwischen der Spannung über der LED (10) oder der Kette (11) von LEDs oder dem davon abgeleiteten Signal (V) und dem vorgegebenen Referenzwert (R) ist, wenn die Spannung über der LED (10) oder der Kette (11) von LEDs oder das davon abgeleitete Signal (V) den vorgegebenen Wert überschreitet.
  7. Treiberschaltung nach einem der vorhergehenden Ansprüche, wobei das Signal (s) ein elektrischer Strom (i) ist.
  8. Treiberschaltung nach einem der vorhergehenden Ansprüche, wobei die Wandlerschaltung (27) einen Stromerfassungseingang (is) aufweist, der mit einem Messwiderstand (40) verbunden ist, dem der Strom der LED (10) oder der Kette (11) von LEDs zugeführt ist.
  9. Treiberschaltung nach Anspruch 7 und 8, wobei das Signal (i, s) dem Stromerfassungseingang (i2, is) zugeführt wird, wobei sich der Strom des Signals (i) zu einem Signal addiert, das durch den LED-Strom (ILED) verursacht wird.
  10. Treiberschaltung nach einem der vorhergehenden Ansprüche, wobei der verringerte Strom (ILED) derart eingestellt wird, dass die von der LED (10) oder der Kette (11) von LEDs erzeugte Leistung eine vorgegebene Maximalleistung in irgendeinem Betriebsmodus nicht überschreitet.
  11. Treiberschaltung nach einem der vorhergehenden Ansprüche, wobei die Versorgungsschaltung (20) in dem zweiten Betriebsmodus (II) eine konstante Leistung für die LED (10) oder die Kette (11) von LEDs bereitstellt.
  12. Verfahren zum Treiben einer LED (10) oder einer Kette (11) von LEDs für Beleuchtungs- und Signalzwecke umfassend:
    Erfassen der Spannung über der LED (10) oder der Kette (11) von LEDs,
    Bereitstellen eines konstanten Stroms (ILED) für die wenigstens eine LED (10) oder die Kette (11) von LEDs, wenn die Spannung (ULED) oder ein davon abgeleitetes Signal (V) unterhalb eines vorgegebenen Referenzwertes (R) liegt,
    Bereitstellen eines verringerten Stroms (ILED) für die zumindest eine LED (10) oder die Kette (11) von LEDs, wenn die Spannung (ULED) oder ein davon abgeleitetes Signal (V) oberhalb des vorgegebenen Referenzwertes (R) liegt.
  13. Verfahren nach Anspruch 12, gekennzeichnet durch
    Bereitstellen eines Signals (s), das neutral ist, wenn die Spannung (ULED) über der LED (10) oder der Kette (11) von LEDs oder ein davon abgeleitetes Signal (V) unterhalb des Referenzwertes (R) ist, und das von Null verschieden und proportional zu einer Spannung (ULED) über der LED (10) oder der Kette (11) von LEDs ist, wenn die Spannung (DLED) über der LED (10) oder der Kette (11) von LEDs oder ein davon abgeleitetes Signal (V) über dem Referenzwert (R) liegt, und
    Addieren des Signals (s) zu einem anderen Signal, das von dem durch die LED (10) oder die Kette (11) von LEDs fließenden Strom abgeleitet ist.
  14. Verfahren nach Anspruch 12, gekennzeichnet durch
    Bereitstellen eines Stromes (i), der Null ist, wenn die Spannung (ULED) über der LED (10) oder der Kette (11) von LEDs oder ein davon abgeleitetes Signal (V) unterhalb des Referenzwertes (R) liegt, und das von Null verschieden und proportional zu einer Spannung (ULED) über einer LED (10) oder einer Kette (11) von LEDs ist, wenn die Spannung (ULED) über der LED (10) oder der Kette (11) von LEDs oder ein davon abgeleitetes Signal (V) oberhalb des Referenzwertes (R) liegt, und
    Addieren des Stromes (i) zu einem anderen Strom, der von einer Spannung abgeleitet ist, die durch einen Strom verursacht ist, der durch einen Messwiderstand (40) fließt und der den durch die LED (10) oder die Kette (11) von LEDs fließenden Strom (ILED) charakterisiert.
EP11191353.9A 2011-11-30 2011-11-30 LED-Treiberschaltung mit konstanter Stromsparbetriebsfläche Not-in-force EP2600694B1 (de)

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EP11191353.9A EP2600694B1 (de) 2011-11-30 2011-11-30 LED-Treiberschaltung mit konstanter Stromsparbetriebsfläche

Applications Claiming Priority (1)

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EP11191353.9A EP2600694B1 (de) 2011-11-30 2011-11-30 LED-Treiberschaltung mit konstanter Stromsparbetriebsfläche

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EP2600694A1 EP2600694A1 (de) 2013-06-05
EP2600694B1 true EP2600694B1 (de) 2013-11-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4005348B1 (de) * 2019-07-24 2023-05-31 eldoLAB Holding B.V. Intelligentes anlaufverfahren durch einen led-treiber

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Publication number Priority date Publication date Assignee Title
JPH04157771A (ja) * 1990-10-20 1992-05-29 Fujitsu Ltd 定電流回路
US7116294B2 (en) * 2003-02-07 2006-10-03 Whelen Engineering Company, Inc. LED driver circuits
US8487546B2 (en) * 2008-08-29 2013-07-16 Cirrus Logic, Inc. LED lighting system with accurate current control
WO2010118944A1 (de) 2009-04-14 2010-10-21 Tridonic Gmbh & Co Kg Leistungsregelung von led, mittels mittelwert des led-stroms und bidirektionaler zähler
US8503145B2 (en) * 2010-04-14 2013-08-06 Vektrek Electronic Systems, Inc. Fault protected current source for lighting element testing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4005348B1 (de) * 2019-07-24 2023-05-31 eldoLAB Holding B.V. Intelligentes anlaufverfahren durch einen led-treiber

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