EP1278402A1 - Schaltkreis für Leuchtdioden mit temperaturabhängiger Stromregelung - Google Patents
Schaltkreis für Leuchtdioden mit temperaturabhängiger Stromregelung Download PDFInfo
- Publication number
- EP1278402A1 EP1278402A1 EP02011285A EP02011285A EP1278402A1 EP 1278402 A1 EP1278402 A1 EP 1278402A1 EP 02011285 A EP02011285 A EP 02011285A EP 02011285 A EP02011285 A EP 02011285A EP 1278402 A1 EP1278402 A1 EP 1278402A1
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- EP
- European Patent Office
- Prior art keywords
- value
- temperature
- switch
- output
- input
- 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.)
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- 230000001419 dependent effect Effects 0.000 title claims abstract description 11
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 26
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 1
Images
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]
- H05B45/10—Controlling the intensity of the light
- H05B45/18—Controlling the intensity of the light using temperature feedback
Definitions
- the invention relates to an operating device for light emitting diodes according to the preamble of claim 1. It is in particular the regulation of Operating current of the LEDs depending on the ambient temperature.
- the maximum permissible effective value of the operating current of light-emitting diodes depends on the ambient temperature, in hereinafter briefly called temperature. So that a light-emitting diode has a desired service life The following conditions must be met by light-emitting diode manufacturers are specified in more detail. Up to a derating temperature the operating current remains constant. Starting from the derating temperature a so-called derating; d. H. the operating current decreases proportionally with increasing temperature with increasing temperature. The LED may exceed a switch-off temperature are not operated, which is why a shutdown must then take place at the operating current is negligibly small.
- EP 0 891 120 proposes a temperature-dependent Resistor (PTC) to be connected in series with the LEDs. When the temperature rises the resistance of the PTC increases and the current through the LEDs decreases. Disadvantage of this solution is that there is no clear derating temperature below which the operating current is constant.
- PTC temperature-dependent Resistor
- the operating current have a temperature dependency as described in the section on the stand the technology is described and recommended by LED manufacturers.
- Operating devices for light-emitting diodes that regulate the current through the light-emitting diodes generally a control device with a setpoint input at the one Current setting value is present. Depending on the current setting value, the current through the LEDs set. This can be done continuously by influencing one Operating voltage happen an operating arrangement. As for the operation of the The effective value of the operating current is decisive for light emitting diodes also done by means of pulse width modulation.
- an o. G. Control gear a setpoint generator connected to a setpoint output provides a current setpoint. Because the operating current depends on the temperature the control gear also has a temperature measuring device, which provides a temperature measurement that is linear from the ambient temperature depends.
- the current setpoint does not become the setpoint input directly Control device supplied. Rather, the operating device has according to the invention a subtractor with a first and a second input and with an output. The subtractor subtracts an electrical quantity at its second input of an electrical quantity at its first input and starts the result its exit ready. According to the invention, the current setpoint becomes the first input of the subtractor.
- the setpoint input of the control device is according to the invention connected to the output of the subtractor. Accordingly delivers the output of the subtractor the current setting value.
- the second input of the subtractor is connected to a first output of an inventive Control device connected.
- This will result in a deduction value that the Provides control device at its first output, fed to the subtractor.
- the current setting value is equal to that Current setpoint, reduced by a temperature-dependent deduction.
- a task the control device now consists in that from the temperature measurement variable suitable value of the deduction size is determined. This is the temperature measurement fed to a temperature input of the control device. Up to an adjustable Derating start value, the temperature measured variable at the derating temperature assumes a value of the trigger quantity is output, which is the current setpoint not reduced to determine the current setting value. Is the value of the If the measured temperature value exceeds the derating start value, the deduction value is proportional for temperature measurement. According to the invention, we set the current value reduced in proportion to the temperature measurement variable. The transition from constant Current set value at the reduced current set value at the derating temperature according to the invention continuously.
- the operating device has a shutdown device with a Shutdown. If the switch-off temperature is exceeded, the value exceeds an adjustable switch-off value. In this case the Control device via a second output to the shutdown input, a shutdown signal off, which causes the shutdown device to set the current setting value change that the current through the LEDs is negligibly small.
- the manufacturer gives a maximum operating current when reached the shutdown temperature.
- the proportionality between the trigger size and the temperature measurement variable is selected according to the invention in such a way that when reaching the switch-off temperature by the LEDs of the manufacturer for this temperature specified maximum operating current flows. This ensures that for everyone Temperatures the maximum operating current is not exceeded.
- resistors through the letter R resistors through the letter R, transistors by the letter T, amplifier by the letter A, diodes by the letter D followed by a number.
- the operating current IF in mA is plotted against the ambient temperature TA in ° C. Up to a temperature TA of 70 ° C, the operating current IF is constant 70mA. The so-called derating begins above 70 ° C. The derating temperature is therefore 70 ° C. in the present example. In a temperature range between the derating temperature and the switch-off temperature, which in the previous example is 100 ° C., the operating current IF falls linearly with increasing temperature TA. Operation of the light-emitting diode is excluded above the switch-off temperature of 100 ° C.
- FIG. 2 shows a block diagram of an operating device according to the invention.
- a control device 1 supplies at its output 13 the operating current for the Rubbing LEDs 2. Via a feedback line 3, an actual value of the Operating current is fed into an actual value input 12 of the control device 1.
- the setpoint generator 5 provides a current setpoint at its setpoint output 51. According to the invention, this is fed to a first input 61 of an adder 6. An output 63 of the adder 6 supplies a current setting value for a setpoint input 11 of the control device 1. At the second input 62 of the adder 6 is a Deduction value fed in, which a control device 8 provides at its output 82. According to the current setting value, which corresponds to the output 63 of the Adder 6 is output, the current setpoint minus the deduction value. In Fig. 2 the current setting value is calculated by an adder 6, the second input of which 62 is inverted. This is indicated by a minus sign at the second input 62 indicated. It is also possible to have an inverted deduction value on to provide the first output 82 of the control device 8. An inversion on second input 62 is then no longer necessary.
- Another possibility for calculating the current setting value is that the adder 6 is replaced by a subtractor. At the first entrance 61 Minuend, the subtrahend is fed in at the second input 62. The inversion a value is not necessary in this case.
- the deduction value is in the control device depending on the temperature certainly.
- a temperature measuring device 4 outputs an output 41 Temperature measured variable, which in the temperature input 81 of the control device 8 is fed.
- the control device sets below the derating temperature a deduction value that does not affect the current setpoint, causing the current setpoint is equal to the current setpoint.
- rises above the derating temperature the deduction value is linear with the temperature measurement variable, so that the current setting value decreases linearly with temperature.
- the deduction value is from the control device 8 selected so that the course of the current setting value at the derating temperature is steady.
- control device 8 If the switch-off temperature is reached, the control device 8 outputs the second one Output 83 outputs a shutdown signal to input 71 of shutdown device 7.
- the shutdown device 7 then influences the setpoint generator via its output 72 in such a way that a setpoint is sent to the adder 6 at the setpoint output 51 is output, which results in an operating current that is negligibly small is.
- FIG Operating current delivers, as it is shown in principle in Fig. 1.
- Fig. 3 is the circuit diagram of an embodiment of the invention therefor given how a current setting value is generated from the current setpoint.
- An adder is formed from an operational amplifier A1 and resistors R1, R2 and R3. Via R2, a first input of the adder with the inverting Input connected from A1. A second input of the adder is connected via R1 connected to the inverting input of A1. R3 connects the output of A1 with its inverting input. The output of A1 forms the output of the Adders VST. There is the sum of the two input signals, i.e. the current setting value, available in inverted form. Becomes a non-inverted form an inverter must be connected downstream of the adder. The non-inverting input of A1 is connected to a potential called VM using virtual ground becomes. The virtual ground VM forms the reference potential for the inputs of the adder. The virtual ground VM is derived using a voltage divider from the resistors R4 and R5, which is between a reference voltage VR and a ground potential M is connected.
- a current setpoint VS is fed in at the first input of the adder.
- In this example there is Switch-off device only from an NPN bipolar transistor T1. With that you can implement the shutdown device inexpensively. It is also possible to get one use other electronic switches.
- the collector of T1 is with the Current setpoint connected while the emitter is at ground potential M.
- the base of T1 forms a shutdown input that matches the output of a comparator A2 is connected.
- A2 is implemented by an operational amplifier. As soon as A2 one If the switch-off signal is sent to T1, the current setpoint is set to ground potential a value is output at the output of the adder VST that has no operating current allows more.
- a temperature measuring device is formed from the series connection of a resistor R6 and a reference diode D1 and an operational amplifier A3.
- the Series connection of R6 and D1 is between the reference voltage VR and that Ground potential M switched, with the cathode from D1 to ground potential M lies.
- the connection point of D1 and R6 is with the non-inverting input connected by A3.
- the inverting input of A3 is with the output connected by A3.
- A3 thus forms a tension follower and places on his Output the forward voltage of D1 is available, which is a temperature measurement forms.
- the forward voltage of semiconductor diodes is inversely proportional to the temperature. I.e. the temperature measurand is in inverted form.
- any semiconductor diode can be used for D1.
- a diode is used advantageously for D1, which corresponds to the type of corresponds to the operating LEDs.
- the output of A3 at which the temperature measurement variable is applied becomes the inverting one Input fed from A2.
- the non-inverting input is connected to a center tap of a voltage divider, formed from resistors R7 and R8, which is connected between the reference voltage VR and the ground potential M.
- the ratio of the resistors R7 and R8 is chosen so that at the switch-off temperature the comparator A2 outputs a shutdown signal and T1 in a conductive state added.
- the center tap of this voltage divider is with the non-inverting Input of an operational amplifier A4 and one with a first input pole Switch S1 connected.
- the switch S1 can be both mechanical and be carried out electronically.
- the second input pole of the switch S1 and the inverting inputs of A4 are connected to the virtual ground VM.
- the output pole of the switch S1 is connected to the second input of the adder.
- the output of A4 controls the switch S1.
- the ratio of the resistances R9 and R10 are matched to the potential of the virtual mass VM so that that the switch is switched at the derating temperature.
- the switch places the virtual ground on the second Input of the adder.
- the current setting value VST is thus at the output of the adder regardless of the temperature.
- the switch S1 is at the output of the switch S1 potential immediately after the derating temperature is exceeded that corresponds to the virtual mass VM.
- the course of the voltage at the output switch S1 at the derating temperature is therefore constant.
- the switch S1 is inversely proportional to the temperature Deduction value switched to the second input of the adder.
- the following elements can be assigned to the control device: R4, R5, R7, R8, R9, R10, A2, A4, S1 and the reference voltage VR. Following size can be defined:
- the output of A3 forms the temperature measurement variable and is fed a temperature input of the control device, which is formed by inverting input from A2 and from a connector from R9.
- a first exit the control device forms the output pole of the switch S1. There will the deduction size provided.
- the output of A2 forms a second output the control device which provides the shutdown signal.
Landscapes
- Led Devices (AREA)
- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
- Figur 1
- die Temperaturabhängigkeit des maximal zulässigen Betriebsstroms einer Leuchtdiode
- Figur 2
- ein Blockdiagramm eines erfindungsgemäßen Betriebsgeräts
- Figur 3
- ein Ausführungsbeispiel für die erfindungsgemäße Erzeugung des Stromeinstellwerts
Claims (6)
- Betriebsgerät zum Betrieb von Leuchtdioden mit folgenden Merkmalen:dadurch gekennzeichnet, dass das Betriebsgerät folgende Merkmale umfasst:Regeleinrichtung(1) zum Regeln des Betriebsstroms (IF) der Leuchtdioden (2) mit einem Sollwerteingang (11), an dem ein Stromeinstellwert (VST) eingespeist werden kann,Sollwertgeber (5), der an einem Sollwertausgang (51) einen Stromsollwert (VS) ausgibt,Temperaturmesseinrichtung (4), die eine Temperaturmessgröße bereitstellt, die linear von einer Umgebungstemperatur (TA) abhängt,Subtrahierer, mit einem ersten (61) und einem zweiten Eingang (62) und einem Ausgang (63), der eine elektrische Größe an seinem zweiten Eingang (62) von einer elektrischen Größe an seinem ersten Eingang (61) subtrahiert und das Ergebnis an seinem Ausgang (63) bereitstellt, wobei dem ersten Eingang (61) der Stromsollwert (VS) zugeführt wird und der Ausgang (63) mit dem Sollwerteingang (11) der Regeleinrichtung (1) verbunden ist,Abschalteinrichtung (7) mit einem Abschalteingang (71), die bei Anliegen eines Abschaltsignals am Abschalteingang (71) den Stromeinstellwert (VST) so verändert, dass der Strom durch die Leuchtdioden vernachlässigbar klein wird,Steuereinrichtung (8), die folgende Anschlüsse besitzt:Temperatureingang (81), dem die Temperaturmessgröße zugeführt wird,erster Ausgang (82), der eine Abzugsgröße bereitstellt, deren Wert dem zweiten Eingang(62) des Subtrahierers zugeführt wird, wobei der Wert der Abzugsgröße so eingestellt wird, dass für den Fall, dass der Wert der Temperaturmessgröße unter einem einstellbarem Derating-Startwert liegt, am Ausgang des Subtrahierers der Stromsollwert anliegt und für den Fall, dass der Wert der Temperaturmessgröße über dem Derating-Startwert liegt, der Wert der Abzugsgröße proportional zum Wert der Temperaturmessgröße ist, wobei der Wert der Größe am Ausgang des Subtrahierers beim Derating-Startwert stetig verläuft,zweiter Ausgang (83), der mit dem Abschalteingang (71) der Abschalteinrichtung (7) verbunden ist und ein Abschaltsignal ausgibt für den Fall, dass der Wert der Temperaturmessgröße über einem einstellbarem Abschaltwert liegt.
- Betriebsgerät gemäß Anspruch 1, dadurch gekennzeichnet, dass die Temperaturmessgröße von einer Flussspannung an einer Leuchtdiode abgeleitet wird.
- Betriebsgerät gemäß Anspruch 1, dadurch gekennzeichnet, dass die Abschalteinrichtung einen elektronischen Schalter (T1) enthält, der bei Anliegen eines Abschaltsignals am Abschalteingang (71) schließt und damit den Sollwertausgang mit einem Massepotenzial (M) verbindet.
- Betriebsgerät gemäß Anspruch 1, gekennzeichnet durch folgende Merkmale:der Subtrahierer besitzt einen Anschluss für eine virtuelle Masse (VM), die ein Bezugspotenzial für die Eingänge (61, 62) des Subtrahierers bildet,der Anschluss für die virtuelle Masse (VM) des Subtrahierers ist mit einer einstellbaren Referenzspannung (VR) verbunden,die Steuereinrichtung (8) besitzt einen Umschalter (S1), der auch als elektronischer Schalter ausgeführt sein kann, mit dem der erste Ausgang (82) der Steuereinrichtung (8) zwischen zwei Potenzialen umgeschaltet werden kann,die Stellung des Umschalters (S1) ist abhängig von einem Vergleich zwischen der Höhe des Potenzials der virtuellen Masse (VM) und einem einstellbaren Bruchteil der Temperaturmessgröße,für den Fall, dass der einstellbare Bruchteil der Temperaturmessgröße kleiner ist, als die Höhe des Potenzials der virtuellen Masse (VM), wird der Umschalter (S1) in eine Stellung gebracht, in der der erste Ausgang (82) der Steuereinrichtung (8) mit der virtuellen Masse (VM) verbunden wird,für den Fall, dass der einstellbare Bruchteil der Temperaturmessgröße größer ist, als die Höhe des Potenzials der virtuellen Masse (VM), wird der Umschalter in eine Stellung gebracht, in der der erste Ausgang der Steuereinrichtung mit dem einstellbaren Bruchteil der Temperaturmessgröße verbunden wird,der einstellbare Bruchteil der Temperaturmessgröße ist so eingestellt, dass er dem Potenzial der virtuellen Masse entspricht, falls die Temperaturmessgröße den Derating-Startwert annimmt.
- Betriebsgerät gemäß Anspruch 1, dadurch gekennzeichnet, dass ein Proportionalitätsfaktor, der den Wert der Abzugsgröße in Abhängigkeit vom Wert der Temperaturmessgröße bestimmt, so gewählt ist, dass bei erreichen des Abschaltwerts der Temperaturmessgröße der Subtrahierer einen Stromeinstellwert (VST) ausgibt, der einen Betriebsstrom der Leuchtdioden (2) bewirkt, der einem maximal zulässigen Betriebsstrom bei einer maximal zulässigen Betriebstemperatur der Leuchtdioden (2) entspricht.
- Betriebsgerät gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Subtrahierer durch einen Addierer (6) ersetzt ist und die Temperaturmessgröße invertiert diesem Addierer (6) zugeführt wird.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10134246A DE10134246A1 (de) | 2001-07-18 | 2001-07-18 | Betriebsgerät für Leuchtdioden mit temperaturabhängiger Stromregelung |
| DE10134246 | 2001-07-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1278402A1 true EP1278402A1 (de) | 2003-01-22 |
| EP1278402B1 EP1278402B1 (de) | 2005-05-11 |
Family
ID=7691766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02011285A Expired - Lifetime EP1278402B1 (de) | 2001-07-18 | 2002-05-22 | Schaltkreis für Leuchtdioden mit temperaturabhängiger Stromregelung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1278402B1 (de) |
| JP (1) | JP2003046132A (de) |
| AT (1) | ATE295676T1 (de) |
| DE (2) | DE10134246A1 (de) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007092355A1 (en) * | 2006-02-03 | 2007-08-16 | Honeywell International Inc. | Temperature controlled led array |
| US7626346B2 (en) | 2006-06-28 | 2009-12-01 | Osram Gesellschaft Mit Beschraenkter Haftung | LED circuit with current control |
| WO2010142006A3 (en) * | 2009-06-12 | 2011-04-07 | Ecolight Jsc. | Method and device for thermal protection and management of light source |
| RU2434368C2 (ru) * | 2005-06-03 | 2011-11-20 | Конинклейке Филипс Электроникс Н.В. | Система и способ для управления светильником сид |
| WO2014012060A1 (en) * | 2012-07-13 | 2014-01-16 | Qualcomm Incorporated | Method and apparatus for current derating with integrated temperature sensing |
| US8659235B2 (en) | 2009-03-17 | 2014-02-25 | Lear Corporation Gmbh | Process and circuitry for controlling a load |
| US8733966B2 (en) * | 2004-08-20 | 2014-05-27 | Mag Instrument, Inc. | LED flashlight |
| DE102014114389A1 (de) * | 2014-10-02 | 2016-04-07 | Osram Opto Semiconductors Gmbh | Verfahren zum Betreiben eines optoelektronischen Halbleiterchips und optoelektronisches Bauelement |
| US9354620B2 (en) | 2012-05-03 | 2016-05-31 | Powermat Technologies Ltd. | System and method for triggering power transfer across an inductive power coupling and non resonant transmission |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3984214B2 (ja) | 2003-10-21 | 2007-10-03 | ローム株式会社 | 発光制御装置 |
| DE102006033233A1 (de) * | 2006-07-18 | 2008-01-24 | Austriamicrosystems Ag | Verfahren und Schaltungsanordnung zum Betrieb einer Leuchtdiode |
| DE102008017483A1 (de) * | 2008-04-03 | 2009-10-08 | Steinel Gmbh | Leuchtenvorrichtung |
| DE102010041987A1 (de) * | 2010-10-05 | 2012-04-05 | Tridonic Gmbh & Co. Kg | Betriebsgerät mit einstellbarer kritischer Temperatur |
| CN108521692B (zh) * | 2018-03-21 | 2024-08-02 | 富满微电子集团股份有限公司 | Led照明系统的温度控制方法及led照明系统 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01166578A (ja) * | 1987-12-23 | 1989-06-30 | Nec Corp | 温度制御機能付led駆動回路 |
| JPH01294070A (ja) * | 1988-05-20 | 1989-11-28 | Mitsubishi Electric Corp | 駆動回路 |
| DE19810827A1 (de) * | 1998-03-12 | 1999-09-16 | Siemens Ag | Schaltung zur temperaturabhängigen Stromversorgung einer LED |
| WO2001048495A1 (en) * | 1999-12-23 | 2001-07-05 | Gelcore Company | Non-linear light-emitting load current control |
-
2001
- 2001-07-18 DE DE10134246A patent/DE10134246A1/de not_active Withdrawn
-
2002
- 2002-05-22 DE DE50203055T patent/DE50203055D1/de not_active Expired - Lifetime
- 2002-05-22 AT AT02011285T patent/ATE295676T1/de active
- 2002-05-22 EP EP02011285A patent/EP1278402B1/de not_active Expired - Lifetime
- 2002-07-16 JP JP2002207265A patent/JP2003046132A/ja active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01166578A (ja) * | 1987-12-23 | 1989-06-30 | Nec Corp | 温度制御機能付led駆動回路 |
| JPH01294070A (ja) * | 1988-05-20 | 1989-11-28 | Mitsubishi Electric Corp | 駆動回路 |
| DE19810827A1 (de) * | 1998-03-12 | 1999-09-16 | Siemens Ag | Schaltung zur temperaturabhängigen Stromversorgung einer LED |
| WO2001048495A1 (en) * | 1999-12-23 | 2001-07-05 | Gelcore Company | Non-linear light-emitting load current control |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 013, no. 439 (E - 827) 3 October 1989 (1989-10-03) * |
| PATENT ABSTRACTS OF JAPAN vol. 014, no. 075 (M - 0934) 13 February 1990 (1990-02-13) * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8733966B2 (en) * | 2004-08-20 | 2014-05-27 | Mag Instrument, Inc. | LED flashlight |
| US9719658B2 (en) | 2004-08-20 | 2017-08-01 | Mag Instrument, Inc. | LED flashlight |
| RU2434368C2 (ru) * | 2005-06-03 | 2011-11-20 | Конинклейке Филипс Электроникс Н.В. | Система и способ для управления светильником сид |
| US7414370B2 (en) | 2006-02-03 | 2008-08-19 | Honeywell International Inc. | Increasing reliability of operation of light emitting diode arrays at higher operating temperatures and its use in the lamps of automobiles |
| CN101401486B (zh) * | 2006-02-03 | 2011-03-09 | 霍尼韦尔国际公司 | 在更高工作温度下提高发光二极管阵列工作可靠性及在汽车灯中的使用 |
| WO2007092355A1 (en) * | 2006-02-03 | 2007-08-16 | Honeywell International Inc. | Temperature controlled led array |
| US7626346B2 (en) | 2006-06-28 | 2009-12-01 | Osram Gesellschaft Mit Beschraenkter Haftung | LED circuit with current control |
| US8659235B2 (en) | 2009-03-17 | 2014-02-25 | Lear Corporation Gmbh | Process and circuitry for controlling a load |
| WO2010142006A3 (en) * | 2009-06-12 | 2011-04-07 | Ecolight Jsc. | Method and device for thermal protection and management of light source |
| US9354620B2 (en) | 2012-05-03 | 2016-05-31 | Powermat Technologies Ltd. | System and method for triggering power transfer across an inductive power coupling and non resonant transmission |
| US10523054B2 (en) | 2012-05-03 | 2019-12-31 | Powermat Technologies Ltd. | System and method for triggering power transfer across an inductive power coupling and non resonant transmission |
| WO2014012060A1 (en) * | 2012-07-13 | 2014-01-16 | Qualcomm Incorporated | Method and apparatus for current derating with integrated temperature sensing |
| US9081555B2 (en) | 2012-07-13 | 2015-07-14 | Qualcomm Incorporated | Method and apparatus for current derating with integrated temperature sensing |
| DE102014114389A1 (de) * | 2014-10-02 | 2016-04-07 | Osram Opto Semiconductors Gmbh | Verfahren zum Betreiben eines optoelektronischen Halbleiterchips und optoelektronisches Bauelement |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50203055D1 (de) | 2005-06-16 |
| ATE295676T1 (de) | 2005-05-15 |
| EP1278402B1 (de) | 2005-05-11 |
| JP2003046132A (ja) | 2003-02-14 |
| DE10134246A1 (de) | 2003-02-06 |
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