EP1278402B1 - Schaltkreis für Leuchtdioden mit temperaturabhängiger Stromregelung - Google Patents
Schaltkreis für Leuchtdioden mit temperaturabhängiger Stromregelung Download PDFInfo
- Publication number
- EP1278402B1 EP1278402B1 EP02011285A EP02011285A EP1278402B1 EP 1278402 B1 EP1278402 B1 EP 1278402B1 EP 02011285 A EP02011285 A EP 02011285A EP 02011285 A EP02011285 A EP 02011285A EP 1278402 B1 EP1278402 B1 EP 1278402B1
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- EP
- European Patent Office
- Prior art keywords
- value
- input
- output
- temperature
- temperature measured
- 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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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 is based on a control gear for light-emitting diodes according to the preamble of claim 1. It concerns in particular the regulation of the Operating current of the LEDs as a function of the ambient temperature.
- the maximum permissible effective value of the operating current of LEDs depends on the ambient temperature, in the following briefly called temperature. So that a light-emitting diode a desired life Achieved, the following conditions must be met by light-emitting diode manufacturers are specified more precisely.
- a derating temperature the operating current remains constant. From the derating temperature begins a so-called derating; d. H. with increasing temperature the operating current decreases proportionally with increasing temperature. Above a shutdown temperature, the LED may not be operated, which is why then a shutdown must be done in the the operating current is negligibly small.
- a diode in the present case a light-emitting diode, operated in the flow direction, so falls on her from a forward voltage.
- a control circuit provides the current through the LEDs so that the forward voltage remains constant.
- the temperature of the LED is independent of the ambient temperature kept constant. Disadvantage of this solution is that under the derating temperature not a desired operating current is maintained.
- the operating current have a temperature dependence as in the section to the state The technique is described and recommended by LED manufacturers.
- Operating devices for light-emitting diodes which regulate the current through the light-emitting diodes, have In general, a control device, with a setpoint input to the one Current setting value is applied. Depending on the Stromeinstellwert the current through the LEDs are set. This can be done continuously by influencing one Operating voltage of an operating arrangement done. As for the operation of the Light emitting diodes of the effective value of the operating current is decisive, a regulation also done by means of a pulse width modulation.
- an o. G. Operating device a setpoint generator, which is at a setpoint output provides a current setpoint. As the operating current of 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 is not directly the setpoint input of the Control device supplied. Rather, the operating device according to the invention a subtractor having first and second inputs and an output. The subtracter subtracts an electrical quantity at its second input of an electrical quantity at its first input and sets the result. ready for his exit.
- the current setpoint is inventively the first input supplied to 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 Stromeinstellwert.
- the second input of the subtracter is connected to a first output of an inventive Control device connected.
- This will be a deduction value that the Provides control device at its first output, supplied to the subtractor.
- the invention is caused by the fact that the Stromeinstellwert equal to Current setpoint, reduced by a temperature-dependent pull-off variable.
- a task The control device now consists of the temperature measurement variable appropriate value of the deduction size is determined. For this purpose, the temperature measured fed to a temperature input of the control device. Up to an adjustable Derating start value, the temperature measured at the derating temperature assumes a value of the trigger size that is the current setpoint not reduced to determine the current setting value. Is the value of the Temperature measured above the Deratingstartwert, so the deduction size is proportional to the temperature measurement. According to the invention we thereby the Stromeinstellwert reduced proportional to the temperature measured. The transition from the constant Current setting value for the reduced current setting value at the derating temperature continuous according to the invention.
- the operating device has a shutdown device with a Shutdown.
- the value exceeds the temperature measurement an adjustable shutdown.
- the Control device via a second output to the shutdown input a shutdown signal off, which causes the shutdown device to the Stromeinstellwert so change that the current through the light emitting diodes is negligible.
- the manufacturer gives a maximum operating current when reaching the shutdown temperature.
- the proportionality between the deduction size and the temperature measurement is inventively chosen so that when reach the shutdown temperature through the LEDs from the manufacturer for this temperature specified maximum operating current flows. This will achieve that for all Temperatures the maximum operating current is not exceeded.
- resistors by the letter R resistors by the letter R, transistors through the letter T, amplifiers through the letter A, diodes through the letter D respectively followed by a number.
- FIG. 1 shows an example of the temperature dependence of the maximum permissible operating current of a light-emitting diode. These are manufacturer specifications for a type LA E675 light-emitting diode from Osram Opto Semiconductors.
- the operating current IF in mA is plotted in a graph above the ambient temperature TA in ° C. Up to a temperature TA of 70 ° C, the operating current IF is constant 70mA. Above 70 ° C begins the so-called derating. The derating temperature is therefore in the present example 70 ° C. In a temperature range between the derating temperature and the cut-off temperature, which in the example given is 100 ° C., the operating current IF decreases linearly with increasing temperature TA. Above the shutdown temperature of 100 ° C operation of the LED is excluded.
- 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 embrittenden LEDs 2.
- About a feedback line 3 is an actual value of the Operating current 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. This is inventively supplied to a first input 61 of an adder 6. An output 63 of adder 6 provides a current setpoint for a setpoint input 11 of the control device 1. At the second input 62 of the adder 6 is a Deduction value fed to a controller 8 provides at its output 82. According to the invention corresponds to the Stromeinstellwert that at the output 63 of Adder 6, the current setpoint minus the trigger value. In Fig. 2 the current setting value is calculated by an adder 6 whose second input 62 is inverted. This is indicated by a minus sign at the second input 62 indicated. In the same way, it is also possible to use an inverted subtraction value at the same time provide first output 82 of the controller 8. An inversion on the second input 62 is then no longer necessary.
- the deduction value is in the control device as a function of the temperature certainly.
- a temperature measuring device 4 at its output 41 a Temperature measurement, which in the temperature input 81 of the control device. 8 is fed.
- the controller Below the derating temperature, the controller provides a deduction value that does not affect the current setpoint, causing the Stromeinstellwert is equal to the current setpoint.
- the withdrawal value Above the derating temperature rises the withdrawal value is linear with the temperature measured, so that the Stromeinstellwert decreases linearly with the temperature.
- the deduction is made by the controller 8 chosen so that the course of Stromeinstellwerts at the derating temperature is steady.
- the control device 8 is at its second Output 83 a shutdown signal to the input 71 of the shutdown device 7 off. Thereupon the shutdown device 7 influences the setpoint generator via its output 72 in the way that at the setpoint output 51, a desired value to the adder. 6 is issued, which has an operating current to follow, the negligible is.
- Fig. 2 is a temperature-dependent Operating current supplies, as shown in principle in Fig. 1.
- Fig. 3 is the circuit diagram of an embodiment of this invention given how a Stromeinstellwert is generated from the current setpoint.
- An adder is formed of an operational amplifier A1 and resistors R1, R2 and R3. Via R2, a first input of the adder with the inverting Input connected by A1. Over R1 becomes a second input of the adder 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 Adder's VST. There is the sum of the two input signals, ie the current setting value, available in inverted form. Becomes a non-inverted form required, the adder is followed by an inverter. The non-inverting input from A1 is connected to a potential called Virtual Mass VM becomes. The virtual ground VM forms the reference potential for the inputs of the adder. The virtual mass VM is derived by means of 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.
- a shutdown device In the present example, the Turn-off device only from an NPN bipolar transistor T1. This can be realize the shutdown device cost. It is also possible for one other electronic switch to use.
- the collector of T1 is with the Current setpoint connected while the emitter is at ground potential M.
- the base from T1 forms a turn-off input, which is connected to the output of a comparator A2 is connected.
- A2 is realized by an operational amplifier. Once A2 Shutdown signal outputs to T1, the current setpoint is set to ground potential, whereby At the output of the adder VST, a value is output which 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 the Ground potential M, wherein the cathode of 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 forms a voltage follower and sets at his Output the forward voltage of D1 available, which is a temperature measurement forms.
- the forward voltage of semiconductor diodes is inversely proportional to the temperature. Ie. the temperature measured variable is in inverted form. That's why In the present embodiment, an adder and no subtractor is used.
- D1 basically any semiconductor diode can be used. As it is, however it is important that the same temperature is relevant for D1 as for the ones to be operated Light emitting diodes, is advantageously used for D 1, a diode, the type of corresponding operating diodes.
- the non-inverting input is connected to a center tap of a voltage divider formed by 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 shutdown temperature the comparator A2 outputs a turn-off 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 with a first input terminal of a Switch S1 connected.
- the switch S1 can be both mechanically and be executed electronically.
- the second input pole of the switch S1 and the inverting input from A4 are connected to the virtual ground VM.
- Of the Output terminal of the switch S1 is connected to the second input of the adder.
- the output of A4 controls the switch S1.
- the ratio of resistances R9 and R10 are tuned to the potential of the virtual mass VM, that the changeover switch is switched at the derating temperature.
- the switch sets the virtual ground to the second one Input of the adder.
- the Stromeinstellwert VST at the output of the adder regardless of the temperature.
- the switch S 1 is at the output of the switch S 1 immediately after exceeding the derating temperature a potential which corresponds to the virtual mass VM.
- the course of the voltage at the output of the switch S 1 at the derating temperature is therefore steady.
- Above the derating temperature is via the switch S 1, a reverse proportional to the temperature Trigger 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 and is measured a temperature input of the control device, which is formed by the inverting input from A2 and from a terminal of 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)
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: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 (S 1), 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 (S 1) 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 EP1278402A1 (de) | 2003-01-22 |
EP1278402B1 true EP1278402B1 (de) | 2005-05-11 |
Family
ID=7691766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02011285A Expired - Fee Related 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 (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1874097A1 (de) | 2006-06-28 | 2008-01-02 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | LED-Schaltung mit Stromregelung |
DE102009003632A1 (de) | 2009-03-17 | 2010-09-30 | Lear Corporation Gmbh | Verfahren und Schaltungsanordnung zur Ansteuerung einer Last |
Families Citing this family (11)
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 |
US8733966B2 (en) | 2004-08-20 | 2014-05-27 | Mag Instrument, Inc. | LED flashlight |
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 |
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 |
BG110405A (bg) * | 2009-06-12 | 2010-12-30 | "Еколайт" Ад | Метод за температурна защита и управление на източник на светлина и устройство, реализиращо метода |
DE102010041987A1 (de) * | 2010-10-05 | 2012-04-05 | Tridonic Gmbh & Co. Kg | Betriebsgerät mit einstellbarer kritischer Temperatur |
WO2013164831A1 (en) | 2012-05-03 | 2013-11-07 | Powermat Technologies Ltd. | System and method for triggering power transfer across an inductive power coupling and non resonant transmission |
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 |
CN108521692A (zh) * | 2018-03-21 | 2018-09-11 | 深圳市富满电子集团股份有限公司 | Led照明***的温度控制方法及led照明*** |
Family Cites Families (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 |
JPH0635189B2 (ja) * | 1988-05-20 | 1994-05-11 | 三菱電機株式会社 | 駆動回路 |
DE19810827A1 (de) * | 1998-03-12 | 1999-09-16 | Siemens Ag | Schaltung zur temperaturabhängigen Stromversorgung einer LED |
US6285139B1 (en) * | 1999-12-23 | 2001-09-04 | Gelcore, Llc | Non-linear light-emitting load current control |
-
2001
- 2001-07-18 DE DE10134246A patent/DE10134246A1/de not_active Withdrawn
-
2002
- 2002-05-22 EP EP02011285A patent/EP1278402B1/de not_active Expired - Fee Related
- 2002-05-22 DE DE50203055T patent/DE50203055D1/de not_active Expired - Lifetime
- 2002-05-22 AT AT02011285T patent/ATE295676T1/de active
- 2002-07-16 JP JP2002207265A patent/JP2003046132A/ja active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1874097A1 (de) | 2006-06-28 | 2008-01-02 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | LED-Schaltung mit Stromregelung |
DE102009003632A1 (de) | 2009-03-17 | 2010-09-30 | Lear Corporation Gmbh | Verfahren und Schaltungsanordnung zur Ansteuerung einer Last |
DE102009003632B4 (de) * | 2009-03-17 | 2013-05-16 | Lear Corporation Gmbh | Verfahren und Schaltungsanordnung zur Ansteuerung einer Last |
Also Published As
Publication number | Publication date |
---|---|
JP2003046132A (ja) | 2003-02-14 |
DE50203055D1 (de) | 2005-06-16 |
EP1278402A1 (de) | 2003-01-22 |
DE10134246A1 (de) | 2003-02-06 |
ATE295676T1 (de) | 2005-05-15 |
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