EP2052584B1 - Circuit pour un véhicule, en particulier pour la commande d'un module d'éclairage - Google Patents

Circuit pour un véhicule, en particulier pour la commande d'un module d'éclairage Download PDF

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Publication number
EP2052584B1
EP2052584B1 EP07801552.6A EP07801552A EP2052584B1 EP 2052584 B1 EP2052584 B1 EP 2052584B1 EP 07801552 A EP07801552 A EP 07801552A EP 2052584 B1 EP2052584 B1 EP 2052584B1
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EP
European Patent Office
Prior art keywords
light source
circuit
light
light sources
switch
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
EP07801552.6A
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German (de)
English (en)
Other versions
EP2052584A1 (fr
Inventor
Thomas Reinle
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.)
Johnson Controls Automotive Electronics GmbH
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Johnson Controls Automotive Electronics GmbH
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Publication date
Application filed by Johnson Controls Automotive Electronics GmbH filed Critical Johnson Controls Automotive Electronics GmbH
Publication of EP2052584A1 publication Critical patent/EP2052584A1/fr
Application granted granted Critical
Publication of EP2052584B1 publication Critical patent/EP2052584B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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

Definitions

  • the present invention relates to a circuit for a motor vehicle, in particular for driving a lighting device, the circuit having a first light source and a second light source connected in parallel, wherein the first light source, a first current sink and the second light source is associated with a second current sink and the circuit a measuring means is assigned.
  • Such circuits for motor vehicles are well known.
  • the drive circuit comprises at least a first LED strand and at least one second LED strand, wherein a switch is arranged in series with each LED strand and each LED strand has a supply terminal, wherein a control loop is designed so that it controls the first switch of the first LED string so that a constant average value of the first LED strand flowing through current is achieved, wherein the control circuit is designed to control the switch of the other LED strands.
  • the drive circuit further comprises a Rescuestromedassungsvoriques, with which the sum of the currents can be determined by at least two LED strands.
  • a disadvantage of this is that a distinction between a so-called master LED strand and other LED strands takes place, so that in a malfunction of the so-called master LED strand failure of the circuit takes place, which adversely affects the reliability of the circuit.
  • Object of the present invention is to provide a drive circuit for a motor vehicle, in particular for controlling a lighting device, with failures of the lighting or the light source or other error conditions are detected and a flexible response to such errors. Furthermore, the thermal power loss should be minimized.
  • a circuit for a motor vehicle in particular for driving a lighting device, wherein the circuit connected in parallel has a first light source and a second light source, wherein the the first light source, a first current sink and the second light source is associated with a second current sink, wherein the circuit is associated with a measuring means and wherein the measuring means is provided for determining the operability of the first light source and for determining the operability of the second light source.
  • the circuit it is further preferred for the circuit to have a first switch associated with the first light source and a second switch assigned to the second light source, the control unit being associated with a control means which is switchable as a function of the functionality of the first light source and depending on the operability of the second light source of the second switch is switchable.
  • this also a cost reduction is achieved by the fact that by reducing the thermal power loss, a higher permissible ambient temperature of the circuit is possible, so that less expensive components with lower requirements according to the invention in the circuit can be used or that the durability or the life of the circuit components and in particular also the components of the light sources (in particular light emitting diodes) is increased.
  • the circuit has a regulator provided for the first light source and the second light source, in particular a current regulator or a voltage regulator.
  • a regulator provided for the first light source and the second light source, in particular a current regulator or a voltage regulator.
  • This makes it possible according to the invention to achieve a targeted adaptation of the electrical voltages or the electrical current provided at the light sources in that in each case only the voltage required is applied to provide a certain light output or by a certain current through the light source or through to achieve the LEDs.
  • This will continue, as in a partial failure of Light sources (alloy of one or more light emitting diodes), an adapted current or voltage control possible, so that further the loss line is reduced or in other possible error cases, the respective loss line is reduced. If the loss of energy due to the alloy of LEDs is too high, the respective light source can be switched off.
  • the controller is further preferred for the controller to be controllable as a function of the operability of the first light source and the second light source.
  • the regulator it is further preferred for the regulator to be controllable after a change in the functionality of the first light source or the second light source with a time delay of less than or equal to one second, preferably of less than or equal to 500 ms, more preferably of less than or equal to 300 ms , most preferably less than or equal to 100 ms.
  • the first light source has a first light-emitting diode, preferably a plurality of first light-emitting diodes, and / or that the second light source has a second light-emitting diode, preferably a plurality of second light-emitting diodes.
  • first light-emitting diode preferably a plurality of first light-emitting diodes
  • second light source has a second light-emitting diode, preferably a plurality of second light-emitting diodes.
  • the circuit is clocked at a sufficient repetition rate, in particular with a duty cycle of turn-on interval to turn-off time interval of less than or equal to 1 to 100, preferably less than or equal to 1 to 200, particularly preferably less than or equal to 1 to 500, most preferably from less than or equal to 1 to 1000.
  • a duty cycle of turn-on interval to turn-off time interval of less than or equal to 1 to 100, preferably less than or equal to 1 to 200, particularly preferably less than or equal to 1 to 500, most preferably from less than or equal to 1 to 1000.
  • FIG. 1 schematically a circuit 10 according to the invention is shown, wherein the circuit 10 is provided in particular for driving a lighting device.
  • the circuit 10 has, for example, a first light source 11 and a second light source 12.
  • the light sources 11, 12 are provided in particular as so-called chains of light emitting diodes, the first light source having a first light emitting diode 11 'or preferably a plurality of first light emitting diodes 11' and wherein the second light source 12 is a second light emitting diode 12 'and preferably a plurality of second light emitting diodes 12 'has.
  • the light sources 11, 12 are respectively connected to or associated with a current sink (alternatively a current source), wherein the first light source 11 is associated with a first current sink 21 and the second light source 12 is associated with a second current sink 22.
  • a current sink alternatively a current source
  • MOS-FET transistor metal oxide semiconductor field effect transistor
  • the circuit 10 has a regulator 60, which regulates the voltage level (or current level) which is applied to the parallel-connected light sources 11, 12.
  • a connection to a measuring means 40 which controls the functionality of the first light source 11 or the second light source 12 is able to check. According to the invention, this check either takes place permanently (ie simultaneously for both the first light source 11 and the second light source 12) or sequentially (ie the light sources 11, 12 are switched on one after the other and the respective result is fed to the measuring means 40).
  • the measuring means 40 is further connected to a control means 50 or combined with this or provided integrated, wherein by means of the control means 50 influence on the behavior of the circuit 10 is taken such that in case of failure, for example, the first light source 11 and the corresponding first Current sink 21 and thus the entire circuit branch of the first light source 11 (hereinafter also referred to as light-emitting diode strand or LED strand) is turned off.
  • the control means 50 influence on the behavior of the circuit 10 is taken such that in case of failure, for example, the first light source 11 and the corresponding first Current sink 21 and thus the entire circuit branch of the first light source 11 (hereinafter also referred to as light-emitting diode strand or LED strand) is turned off.
  • the measuring means 40 by means of the measuring means 40 also it can be determined whether, for example, one of the first light-emitting diodes 11 'or one of the second light-emitting diodes 12' is alloyed (ie low-resistance) and thus no longer produce a voltage drop, which leads to a greater power loss while the supply voltage remains constant at the corresponding LED strand, the invention should be kept as low as possible. If the power loss in the current sink becomes too high due to the alloy of LEDs, this can be selectively switched off.
  • the regulator 60 comprises, in particular, a current regulator or a voltage regulator, wherein a first regulating component 61, for example in the form of an integrated circuit, can be used as an example of a current regulator, and the regulator 60 furthermore comprises a second regulating component 62, for example in the form of a so-called DC / DC Transducer parts, may have.
  • a first regulating component 61 for example in the form of an integrated circuit
  • the regulator 60 furthermore comprises a second regulating component 62, for example in the form of a so-called DC / DC Transducer parts
  • the switchable voltage gain control 50 is required If a total of two LED branches are operated (each with 150mA) and one of them fails, then the voltage at the output of the adder 50 'and voltage gain control 50 must be established be amplified by a factor of two, so that the required voltage at the feedback input 51 of the first control device 61 is doubled (which has the result of the operation of the first control device 61 with the result that the current controller 60 only 150 mA regulated).
  • the control of the circuit 10 initially reacts such that the voltage level at the input 65 of the light sources 11, 12 to the maximum set threshold voltage of the first control device 61st is up-regulated. (Because at the feedback input 51 of the first control device 61 is applied too low voltage). However, in such a situation, the current in the still functioning of the LED branches or light sources 11, 12 is still kept constant at 150 mA, which is due to the function of the constant current sinks 21, 22. Therefore, the remaining voltage drop must ultimately be intercepted via the functioning of the current sinks 21, 22, so that currently a very large power loss occurs. This condition must be prevented with the shortest possible delay time.
  • the measuring means 40 recognizes via the measuring lines 42 that one of the LED strands or one of the light sources 11, 12 has failed and the corresponding LED branch is switched off. Then the voltage at the output of the voltage gain control 50 " raised again to the level in the adjusted state, so that the controller 60 and the first control device 61 can back to the normal voltage level at the input 65 of the light sources 11, 12 back. It is thus ensured by the circuit 10 according to the invention that there are no unstable states. Thus, there is no flash or otherwise a user disturbing impairment of the function of the light source. Precisely because the defective light source is selectively switched off, it is impossible for the light source to work temporarily and then again temporarily.
  • the brightness of the illumination device (which according to the invention is a backlight device for a display device) merely decreases by a defined value and then again remains stable, which is exactly the desired behavior of such an arrangement and, if appropriate is not perceived by a user, such as when the failure of the light sources 11, 12 happens in daylight and due to the ambient illumination of the decline in the backlight is not noticeable.
  • the brightness in areas can be readjusted to the desired value of two or more light sources.
  • FIG. 2 is a schematic representation of the circuit according to the invention according to the first embodiment in the case of two light sources 11, 12 shown in greater detail.
  • the adder 50 'with voltage gain control 50 "Furthermore the measuring means 40 and the control means 50 in the left part of FIG FIG. 2 shown.
  • FIG. 1 addition is in FIG.
  • first switch 31 and a second switch 32 are also shown, wherein the switches 31, 32 are provided for the controlled switching off of individual light-emitting diode branches or individual light sources 11, 12. This is performed by corresponding control lines (not individually provided with a reference numeral) via the control means 50.
  • FIG. 3 is shown in a schematic representation of a second embodiment of the circuit 10 according to the invention.
  • each of the light sources 11 to 15 according to the second embodiment of the inventive circuit 10 has a current sink, but only the first current sink 21 in the FIG. 3 is shown.
  • the control of the light sources 11, 12 takes place in the second embodiment of the invention via the controller 60 and corresponding current sinks 21 analogous to the first embodiment of the invention.
  • the controller 60 with the first control device 61 and the second control device 62, the input 65 of the light sources 11 to 15, the control input 51 and the adder 50 ' is shown. Furthermore, the measuring means 40 and the control means 50 in the left part of the FIG. 3 shown.
  • the control means 50 has an output line 52 which is connected to the Adder 50 'acts, so that at the output 51 of the adder 50' necessary for the stabilization of the control circuit voltage is also present in case of failure of each of the light emitting diode chains or light sources.For each failing LED branch is first by the measuring means 40 via measuring lines 42 (of which, for the sake of simplicity, only one measuring line 42 is shown) detected that the LED branch has failed.
  • the control means 50 subsequently controls the input 52 of the adder 50 'in such a way (in particular by means of a digital / analog converter or by means of a so-called PPG (programmable pulse generator)) that the voltage at the output 51 of the adder remains at the level which is necessary for a regulated voltage at the input 65 of the light sources.
  • PPG programmable pulse generator
  • FIG. 4 a third embodiment of the circuit 10 is shown schematically. Again, the first light source 11, the second light source 12, the first current sink 21, the second current sink 22, the first control device 61, the second control device 62, the first switch 31 and the second switch 32 and the measuring means 40 and the control means 50 are shown .
  • the first and second embodiments of the circuit 10 there is no adder 50 'for providing the voltage level necessary at the feedback input 51 of the first control device 61, but it is connected between the first current sink 21 by means of a first diode D1, in particular a Schottky diode and the feedback input 51 ensures that when the voltage level on the cathode side of the first diode D1 due to a failure of the first light source 11 largely decreases towards the ground potential, a corresponding reaction (due to a turn on of the diode D1) at the feedback input 51 (drop of the applied voltage ) takes place in such a way that in turn the input voltage at the input 65 of the light sources 11, 12 is up-regulated
  • the through-connection of the first diode D1 is then reversed again.
  • a second diode D2 in particular a Schottky diode, between the second current sink 22 and the feedback input 51 that when the voltage level on the cathode side of the second diode D2 due to a failure of the second light source 12 drops as far as possible to the ground potential, a corresponding reaction (due to a Switching through the second diode D2) at the feedback input 51 (drop of voltage applied there) takes place in such a way that in turn the input voltage at the input 65 of the light sources 11, 12 is up-regulated.
  • the provision of the information as to whether or not one of the light sources 11, 12 has failed is directed to the measuring means 40 via a common measuring line 43 (or measuring connection 43 ') for all the light sources 11, 12. It must therefore be done sequentially scanning the various light-emitting branches. About the switch 31, 32 of the failed LED branch is turned off.
  • a third diode D ' (also, for example, a Schottky diode) and a fourth diode D "(likewise, for example, a Schottky diode) are used Circuit 10, the input of the current sinks 21, 22 (ie in each case between the light sources 11, 12 and the current sinks 21, 22, whereby at this point a Meßabgriff is realized) with the anode side, either the third diode D '(first current sink) or the fourth diode D "(second current sink) connected.
  • a time-clocked manner (ie sequentially) by means of the control means 50 is a query, which voltage drop at the light sources 11, 12 is present.
  • a further measuring connection 42 ' is used to measure the voltage drop over the entire light-emitting diode chain for a specific light source 11, 12 FIG. 4
  • the control lines S1, S2, S3, S4 and S5 of the control means 50 and of the measuring and control means 50 are furthermore depicted.
  • control line S1 is the periodic switching on and off of the circuit 10 with activated lighting device (such as backlighting of a display device) and with a duty cycle of Einschaltzeitintervall to Ausschaltzeitintervall depending on the required brightness of the light sources.
  • the control line S2 serves to switch the first light source 11 on or off.
  • the control line S3 serves to switch the second light source 12 on or off.
  • the control line S4 serves to separate the feedback input 51 from the ground potential.
  • the control line S5 is used to sample the voltage regulation (or current regulation) at the input 65 of the light sources and the measuring line 42 or the measuring connection 42 '.
  • FIG. 3 schematically shows a time diagram of various states of the control lines S1, S2, S3, S4 and S5 of the control means 50.
  • the circuit 10 is operated clocked according to the invention. This means that at a clock output (control line S1), which turns the entire circuit on and off at regular intervals on and off.
  • control line S1 which turns the entire circuit on and off at regular intervals on and off.
  • switching on is likewise effected at the same time on the individual switching lines (control lines S2 and S3) for the individual light sources.
  • control line S5 This results in only a minimal time delay between the switch-on time of the circuit and the actual functioning of the circuit (control line S5) of, for example, about 1 to 40 microseconds, preferably about 5 microseconds (the delay time is indicated in the drawing by means of an arrow; is here provided adjustable). This is particularly due to the fact that in FIG.
  • the adder is omitted, the reaction times of the first and second diode D1 / D2 and the switches 31, 32 in the nanosecond range and additionally the reaction time of the operational amplifier of the current sinks 21, 22 could be significantly accelerated, because a) this is supplied with a high voltage (For example, the battery voltage while the voltage is limited to a defined limit) and because b) the output of the operational amplifier is biased (for example, via a resistor to the power supply). This makes it possible that the edge steepness when switching on the circuit is so large that the circuit is ready for operation, for example, in 5 microseconds.

Landscapes

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

Claims (5)

  1. Circuit (10) pour un véhicule automobile, notamment pour commander un dispositif d'éclairage, le circuit (10) présentant une première source de lumière (11) et une deuxième source de lumière (12) branchées en parallèle, un premier collecteur de courant (21) étant associé à la première source de lumière (11) et un deuxième collecteur de courant (22) à la deuxième source de lumière (12), un moyen de mesure (40) étant associé au circuit (10), le moyen de mesure (40) étant prévu pour déterminer l'aptitude fonctionnelle de la première source de lumière (11) et pour déterminer l'aptitude fonctionnelle de la deuxième source de lumière (12), caractérisé en ce que le circuit (10) présente un premier commutateur (31) associé à la première source de lumière (11) et un deuxième commutateur (32) associé à la deuxième source de lumière (12), un moyen de commande (50) étant associé au circuit (10) de telle sorte que le premier commutateur (31) peut être commuté en fonction de l'aptitude fonctionnelle de la première source de lumière (11) et le deuxième commutateur (32) pouvant être commuté en fonction de l'aptitude fonctionnelle de la deuxième source de lumière (12), le circuit (10) présentant un régulateur (60) prévu pour la première source de lumière (11) et la deuxième source de lumière (12), notamment un régulateur de courant ou un régulateur de tension, et le régulateur (60) pouvant être commandé en fonction de l'aptitude fonctionnelle de la première source de lumière (11) et de la deuxième source de lumière (12).
  2. Circuit (10) selon la revendication 1, caractérisé en ce que le régulateur (60), après une modification de l'aptitude fonctionnelle de la première source de lumière (11) ou de la deuxième source de lumière (12), peut être commandé avec un retard dans le temps inférieur ou égal à une seconde, de préférence inférieur ou égal à 500 millisecondes, notamment de préférence inférieur ou égal à 300 millisecondes.
  3. Circuit (10) selon l'une des revendications précédentes, caractérisé en ce que la première source de lumière (11) présente une première diode électroluminescente (11'), de préférence une pluralité de premières diodes électroluminescentes, et/ou que la deuxième source de lumière (12) présente une deuxième diode électroluminescente (12'), de préférence une pluralité de diodes électroluminescentes.
  4. Circuit (10) selon l'une des revendications précédentes, caractérisé en ce que le circuit (10) peut fonctionner de manière cadencée avec une fréquence de répétition suffisante, notamment avec un rapport cyclique entre l'intervalle de mise en circuit et l'intervalle de mise hors circuit inférieur ou égal à 1:100, de préférence inférieur ou égal à 1:200, notamment de préférence inférieur ou égal à 1:500, notamment de nette préférence inférieur ou égal à 1:1000.
  5. Circuit (10) selon l'une des revendications précédentes, caractérisé en ce qu'une prise de mesure munie d'une diode (D', D ") est à chaque fois prévue entre la première source de lumière (11) et le premier collecteur de courant (21) et entre la deuxième source de lumière (12) et le deuxième collecteur de courant (22).
EP07801552.6A 2006-08-08 2007-08-08 Circuit pour un véhicule, en particulier pour la commande d'un module d'éclairage Not-in-force EP2052584B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006037342A DE102006037342B4 (de) 2006-08-08 2006-08-08 Schaltung für ein Kraftfahrzeug, insbesondere zur Ansteuerung einer Beleuchtungseinrichtung
PCT/EP2007/007010 WO2008017467A1 (fr) 2006-08-08 2007-08-08 Circuit pour un véhicule, en particulier pour la commande d'un module d'éclairage

Publications (2)

Publication Number Publication Date
EP2052584A1 EP2052584A1 (fr) 2009-04-29
EP2052584B1 true EP2052584B1 (fr) 2014-03-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07801552.6A Not-in-force EP2052584B1 (fr) 2006-08-08 2007-08-08 Circuit pour un véhicule, en particulier pour la commande d'un module d'éclairage

Country Status (5)

Country Link
US (1) US8143808B2 (fr)
EP (1) EP2052584B1 (fr)
DE (1) DE102006037342B4 (fr)
ES (1) ES2471977T3 (fr)
WO (1) WO2008017467A1 (fr)

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DE102015214939A1 (de) 2015-08-05 2017-02-09 Osram Gmbh Spannungsabhängige Verschaltung einzelner Lichtquellen
AT518685B1 (de) * 2016-06-07 2018-05-15 Zkw Group Gmbh Kraftfahrzeug-Beleuchtungseinrichtung

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Publication number Publication date
WO2008017467A1 (fr) 2008-02-14
US20090184663A1 (en) 2009-07-23
EP2052584A1 (fr) 2009-04-29
DE102006037342B4 (de) 2013-07-18
ES2471977T3 (es) 2014-06-27
US8143808B2 (en) 2012-03-27
DE102006037342A1 (de) 2008-02-21

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