• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The light device according to the invention allows the detection of a light-emitting diode short-circuited in a series connection of a plurality of such diodes. By taking into account the junction temperature of the diodes, the device and the method associated therewith make it possible to avoid false positive detections of short circuits. The device is further capable of learning the operating parameters necessary for detection autonomously and dynamically, which makes it particularly adaptive.
    公开号:FR3035767A1
    申请号:FR1553888
    申请日:2015-04-29
    公开日:2016-11-04
    发明作者:Olivier-Sebastien Lesaffre
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    [0001] The invention relates to the field of light devices for motor vehicles, in particular light devices which use a plurality of light-emitting diodes, LED, to achieve at least one light function of a motor vehicle. A light-emitting diode, LED, is a semiconductor electronic component that emits light when it is traversed by an electric current of a specific intensity. A property that characterizes an LED is its forward voltage Vf. This is the voltage drop measured across the LED when it is traversed by an electric current and emits light. The development of increasingly efficient semiconductor components leads to the appearance of LEDs with direct voltages that are lower and lower. The direct voltage of an LED is, at equal current, a decreasing function of its semiconductor junction temperature. In the automotive industry, and in particular in the field of lighting devices for motor vehicles, the use of LEDs is increasingly recommended to replace traditionally used incandescent light sources. Indeed, the low power consumption of LEDs has an undeniable advantage. In addition, a plurality of LEDs can be placed on a predetermined contour, thus allowing the creation of interesting and individual optical signatures of the lights of a motor vehicle. It is known to use a plurality of LEDs connected in series to perform a light function of a motor vehicle such as, for example, the daytime running lights function, direction indicator or high beam signals. When the junction of one of the LEDs of such a defective serial assembly, there is talk of a short circuit of the LED in question. The headlamps of a motor vehicle may be subject to a wide variety of weather conditions. Thus LEDs forming part of such a projector must be able to operate at very low temperatures of the order of -20 ° C or less, as well as at operating temperatures of the device, which may exceed 80 ° C. It is known to detect a short-circuited LED by comparing the voltage across the series connection to a cumulative direct voltage. Such a known solution assumes that if the measured voltage is lower than N.Vf, where N is the number of LEDs connected in series and Vf is their forward voltage, then one of the LEDs is short-circuited. With a growing number of LEDs mounted in series, this method can, however, in many occurrences produce false positive detections. For example, over a temperature range of -40 ° C to 90 ° C, the forward voltage Vf of an LED may have variations of about 0.6V. The minimum direct voltage Vfm, at maximum temperature, of the same LED can be equal to about 2.3V. In such a configuration, the voltage across a series circuit comprising N LEDs may have variations of N-0.6 V due exclusively to the junction temperature of the LEDs. Clearly, from N = 6, the amplitude of these variations greatly exceeds the minimum direct voltage of each of the LEDs of the assembly. Therefore a short circuit of an LED can no longer be definitely detected and the known method is likely to produce false alarms. DE 10 2007 024 784 B4 discloses a device capable of detecting the short circuit of an LED in a series connection. When a failure is detected, an alert signal is notified to the vehicle user via the vehicle's internal information system. The solution described is not able to take into account the direct voltage variations related to the junction temperature of the LEDs. US Pat. No. 7,638,947 B2 discloses a device for detecting a short circuit of an LED in a series circuit. According to one embodiment described, the device can be adapted to take into account a variation of the direct voltage as a function of the temperature of the LEDs of the series connection. Nevertheless, the proposed solution requires the presence of dedicated electronic components on the printed circuit that supports the LEDs. The dedicated components must be specifically arranged across at least one of the LEDs, which leads to increased production cost, additional constraint when designing such a printed circuit, and loss of space. potential on the printed circuit. The invention aims to overcome at least one of the problems posed by the prior art. More specifically, the object of the invention is to propose a device and a method capable of detecting the short-circuit of an LED in a series connection independently of the junction temperatures and using components already widely existing in light devices for vehicles. known automobiles. The invention relates to a light device for a motor vehicle. The device 35 comprises means for controlling the supply of a plurality of light emitting diodes, LEDs, connected in series. Each of the LEDs is characterized by the same direct voltage Vf depending on its junction temperature. The device comprises first measuring means capable of connecting the LEDs and second means for measuring the electrical voltage across the terminals. The device also comprises processing means for detecting a failure of at least one of the LEDs of the assembly. The device is remarkable in that the processing means 5 are configured to compare the electrical voltage across the measured mounting at a given first instant with the electrical voltage across the measured circuit at a given second instant, the comparison being conditioned to the identity of the junction temperature of the LEDs measured first and second instants; and 10 - detecting a failure of at least one of the LEDs of the assembly according to this comparison. For example, said electrical voltage comparison can be performed by directly comparing the two voltages, or one of these voltages to a comparison voltage 15 immediately dependent on the other voltage. For example, the comparison voltage may be equal to the other voltage minus a tolerance voltage. Equivalently or cumulatively, the comparison may be conditioned to the identities of the currents flowing through the LEDs, the currents being measured at the first and second instants. The device may preferably comprise a memory element, the processing means being configured to read and write in said memory element. The processing means may furthermore be configured to: obtain, by means of the measurement means, a measurement Tmes indicative of the junction temperature of at least one of the LEDs and a measurement Vmes indicative of the electrical voltage across the terminals of the mounting at a given moment when the assembly is powered. if the memory element comprises a voltage value V 'associated with the temperature Tmes, comparing the measurement Vmes with Vcal or with a comparison voltage directly dependent on V',; - conclude that one of the LEDs of the assembly is short-circuited according to said comparison.
    [0002] If necessary, the measured temperature Tmes must be substantially identical to the temperature stored in the memory element.
    [0003] Preferably, the processing means can be configured for: - if the memory element comprises a voltage value V ', associated with the temperature Tmes, comparing the measurement Vmes to (Voe, + / - a), 0 <a; - conclude that one of the LEDs of the circuit is short-circuited if V's <(V ', + / - a).
    [0004] Preferably, the processing means may be configured to update the voltage value V ', recorded using the value Vmes, if Vms (V', + / - a); Preferably, the processing means can be configured to: - if the memory element does not include a voltage value associated with the measurement Tmes, save the measurement Vmes and associate it with the measurement Tmes in the element of memory. The first measuring means may preferably comprise a thermistor arranged near the mounting comprising the plurality of LEDs. The processing means may preferentially comprise a microcontroller element.
    [0005] Preferably, the memory element may be integrated with the microcontroller element. The microcontroller element may preferably be part of the power control means of the LEDs.
    [0006] Preferably, the assembly and the first measuring means are arranged on the same substrate. It may for example be the substrate of a printed circuit, PCB, or a molded interconnection device, MID. The invention also relates to a method for detecting a light emitting diode, LED, short-circuited in a light device for a motor vehicle. The device comprises means for controlling the supply of a plurality of light emitting diodes, LEDs, connected in series. Each of the LEDs is characterized by the same direct voltage Vf depending on its junction temperature. The device also comprises first means for measuring the junction temperature of the LEDs and second means of the electrical voltage across the terminals. The device comprises processing means for detecting a failure of at least one of the LEDs of the arrangement. The method is remarkable in that it comprises the following steps: - comparing the electrical voltage across the mounting measured at a first instant given to the electrical voltage across the measured mounting at a second given instant, the comparison being conditioned to the identity of the junction temperature of the LEDs measured first and second instants; and - detecting a failure of at least one of the LEDs of the assembly according to this comparison.
    [0007] Preferably, the method may comprise the following steps: - obtaining, by means of the measurement means, a measurement Tmes indicative of the junction temperature of at least one of the LEDs and a Vmes measurement indicative of the voltage across the terminals of the mounting at a given moment when the assembly is powered.
    [0008] Preferably, the method may comprise the following steps: if the memory element comprises a voltage value Vcal associated with the temperature Tmes, comparing the measurement Vmes with Vcal or with a comparison voltage directly dependent on V '; - conclude that one of the LEDs of the assembly is short-circuited according to said comparison. Preferably, the method may comprise the following steps: - if the memory element comprises a voltage value Vcal associated with the temperature Tmes, compare the measurement Vmes to (Vcai +/- a), 0 <a <_ ff; 25 - conclude that one of the LEDs of the assembly is short-circuited if V's <( f ', + / - a). Preferably, the method may comprise the following steps: if the memory element does not include a voltage value associated with the measurement Tmes, save the measurement Vmes and associate it with the measurement Tmes in the memory element . The method may preferably further comprise a step of updating the recorded voltage value Vcal and associated with the measurement Tmes using the value Vmes, if Vmes> (Vcal +/- a).
    [0009] The method may preferably comprise an intermediate step of filtering the measurements following the step of obtaining the measurements. During this step, measurements that do not belong to a predetermined range are discarded. The predetermined measuring range for the Tmes measurement may preferably include values between -40 ° C and 90 ° C.
    [0010] Preferably, the predetermined measurement range for the Vmes measurement may comprise the values between 0 Volt and N.Vfmax Volt, where N is the number of LEDs of the assembly and Vfmax is the direct voltage of one of the LEDs of the assembly to - 40 ° C. The process steps can preferably be repeated periodically. The repetition period may for example have a duration of between 2 seconds and 10 minutes, preferably between 2 and 30 seconds. The process steps may preferably be carried out if the junction temperature of the LEDs and the electrical voltage across the circuit are generally constant. During the updating step, the associated voltage value Vcal at the measurement Tmes may preferentially be replaced by a weighted average of the associated voltage value and the measured voltage value Vmes- During the recording step the measured voltage value Vmes may preferably be replaced by a weighted average of the value Vmes and at least one associated voltage value in the memory element at a temperature in the range [Tmes-f3, Tmes + [ 3], [3 being between 0.1 and 30 ° C. Preferably the method may also include a prior step of providing initial voltage values associated with a plurality of temperature values in the memory element.
    [0011] Advantageously, the method is implemented by a light device according to the invention. By using the measurements according to the invention, it becomes possible to detect the short circuit of an LED in a series connection of a plurality of LEDs, independently of the junction temperature of the LEDs and significantly reducing the risk of faults. 35 positive detections. It is customary to include thermistors on a printed circuit comprising an assembly of LEDs, in order to be able to detect very high temperatures that could damage the LEDs. Likewise, the voltage across such a mounting is commonly measured and used to control the power control device of the mounting. The new functionality according to the invention can therefore be achieved without components and therefore without added costs compared to known light devices, using the measurements made available in a previously unknown manner. Since the calibration of the device is done automatically, it is not necessary to calibrate the device during its production. The dynamic learning of the characteristic Vf (T) during the life of the device adapts the device to the conditions in which the motor vehicle that team actually evolves, without having to resort to assumptions of hypothetical operating temperatures and potentially wrong.
    [0012] Other features and advantages of the present invention will be better understood from the exemplary description and the drawings, of which: FIG. 1 is a schematic illustration of a preferred embodiment of the device according to the invention; FIG. 2 is a schematic illustration of the processing means of FIG. 1, also illustrating the main steps of a preferred embodiment of the method according to the invention. Unless otherwise specifically indicated, technical features described in detail for a given embodiment may be combined with the technical features described in the context of other exemplary and non-limiting exemplary embodiments. Various components necessary for the operation of a light device for a motor vehicle, which nevertheless have no impact on the operation of the invention, will not be described in the context of the invention and are in themselves known in art. These are, for example, heat dissipation means, or optical means such as lenses or waveguides. Figure 1 schematically shows a preferred embodiment of the light device 100 according to the invention. A plurality of light-emitting diodes, LEDs, is supplied via power supply control means 110. Such means 110 are known per se in the art and generate at least one converter able to convert a DC input voltage. V, ', generally provided by a battery of the motor vehicle, in a charging voltage of a different value and adapted to supply the assembly 120.
    [0013] The LEDs which together perform at least one light function of the light device, are connected in series and grouped in the assembly 120. The assembly of the LEDs is generally found on a printed circuit board, PCB ("printed circuit board"), dedicated and remote relative to the means 110. The assembly 120 may also be arranged on a molded interconnect device (MID), with a more complex geometry. The means 110 may for example comprise a microcontroller element capable of controlling the charging voltage as a function of the required light function. The device comprises first measuring means 130, able to provide a signal indicative of the junction temperature of the LEDs. This is for example a thermistor mounted on the printed circuit board which supports the mounting 120. The temperature of the printed circuit board can realistically be likened to the junction temperature of an LED mounted on the printed circuit board. As the resistance of a thermistor decreases according to a predetermined profile when its temperature increases, a signal indicative of the temperature of the printed circuit board, and therefore of the semiconductor junction of the LEDs, can be obtained by measuring the electrical voltage across the thermistor. Such measurement circuits are known in the art and will not be described in more detail within the scope of the present invention. Other means for measuring the temperature of the printed circuit and / or the junction temperature of the LEDs can be implemented by those skilled in the art without departing from the scope of the invention.
    [0014] The device also comprises second measuring means 140 able to provide a signal indicative of the electrical voltage across the mounting. The first and second measuring means 130, 140 provide real-time measurements to processing means 160. The processing means may for example comprise a programmable microprocessor element or a microcontroller element.
    [0015] Advantageously, it may be a microcontroller element of the control means 110 of the supply of the assembly 120. The processing means 160 have write and read access on a non-volatile memory element 150. Such elements memory devices are well known in the art and can be integrated with the processing means 160.
    [0016] The processing means 160 also includes, in a nonvolatile memory element, instructions which, when executed, cause the means 160 to perform different steps according to the inventive method. By using as input a temperature measurement Tmes and a voltage value Vmes provided by the measuring means 130 and 140 respectively, the processing means are able to detect if one of the LEDs of the assembly 120 is short-circuited or not. At the same time, the processing means consecutively builds a series of measurements into a profile in the memory element 150. The profile relates the measured voltages to the temperatures at which they were measured. This profile serves as a reference when detecting a short circuit. Indeed, when the N LEDs of the assembly 120 operate, the voltage measured at the terminals of the assembly is equal to Vmes = WVf (Tmes). Obviously, such a profile corresponds to a specific light function. If the LEDs of the fixture 120 can perform several light functions at different applied current intensities, the specific operating mode defines the profile to be used in the process. Thus, the memory element 150 may comprise a plurality of profiles in some embodiments. Since the processing means 160 are preferably integrated with the control means 110 which determine the voltage applied to the LEDs, the information necessary for the proper choice of the profile is available. In what follows, the method according to the invention and the operation of the processing means 160 will be described in detail. The processing means are configured to compare the electrical voltage across the mounting of the LEDs, measured at a first instant, with the electrical voltage across the measured circuit at a given second instant, the comparison being dependent on the identity of the the junction temperature of the LEDs measured first and second instants. In addition, the processing means are configured to detect a failure of at least one of the LEDs of the assembly according to this comparison.
    [0017] Figure 2 illustrates the main steps of the method according to the invention in a preferred embodiment. In a first step 10, the values Tmes and Vmes are obtained by the processing means 160. The memory element 150 is consulted in order to establish whether a voltage value has already been associated with the measured temperature. If this is the case, the voltage value V 'thus found is used as the reference value at which the measured value Vmes is compared in step 30. The value V' represents the cumulative direct voltage of the N LEDs, N.Vf (T's), at temperature T's. It follows that when the measured voltage Vmes is less than (Vmes +/- 30 a), the method can conclude that one of the LEDs of the circuit is short-circuited. This corresponds to step 50. The parameter a defines a threshold value for the detection of a short circuit. In practice, a value of between 0 and the minimum value that the direct voltage of one of the 35 LEDs of the assembly can take is used. If Vfmin is the direct voltage of an LED at 90 ° C, then for example, it is possible to set a = 0.8-Vfmin. Alternatively, the method can directly record the adjusted values V'Ia in the element of memory 150, which allows the direct comparison between the voltage value Vmes and the reference voltage value recorded and associated with the temperature Tmes. Advantageously, the processing means are configured to emit an alert signal and to notify the to the vehicle user when a short circuit is detected. Warning means are not illustrated in the figures and are in themselves known in the state of the art.
    [0018] If the memory element 150 does not include a voltage value associated with the measured temperature Tmes, identical to the measured temperature, a new value Vcal (Tmes) = Vmes is written and stored in the memory element 150 and comes thus complete the recorded profile.
    [0019] When, after the comparison step 30, it proves that the measured voltage Vmes is greater than or equal to the corresponding threshold value (Vmes +/- a), the method concludes that all the LEDs function correctly, and none of the LEDs are short-circuited. Optionally, the measured value can be used to refine or update the voltage value Vcai (Tmes) in the memory element 150. For example, a weighted average of the voltage value previously associated with the temperature Tmes and the measured voltage value can replace the voltage value previously associated with this temperature. In all the embodiments of the method according to the invention, several additional steps described in the following may be considered. In order to avoid the use of erroneous measurements, the values obtained in step 10 can be checked or filtered before using them in the following steps. For example, during a filtering step, measurements not belonging to a predetermined range are discarded. The predetermined measuring range for the measurement Tmes for example includes values between -40 ° C and 90 ° C.
    [0020] The predetermined measuring range for the measurement Vmes for example comprises the values between 0 Volt and N'Vfmax Volt, where N is the number of LEDs of the assembly and Vfmax is the direct voltage of one of the LEDs of the assembly at -40 ° C. . The process is preferably repeated periodically. This makes it possible, on the one hand, to regularly check the correct operation of the LEDs, and on the other hand to learn new values and regularly update the profile stored in the memory element. In order to obtain representative values, it is important to ensure that the temperature and the voltage measured are in a steady state during measurements. As a result of significant variations in temperature or voltage, a steady state is in practice obtained after a few seconds. Therefore, the process is preferably repeated periodically every 2 to 30 seconds. It can also be repeated periodically after several minutes. Alternatively, the device according to the invention comprises detection means capable of identifying whether the values measured by the measuring means 130 and 140 are in a steady state. The process can then be implemented only if a steady state is determined. By steady state is meant keeping the measurements at generally constant values for a predefined period of 1 to 10 seconds. In one embodiment of the method according to the invention, during the step of recording the measured voltage value Vmes, it is replaced by a weighted average of the value Vmes and of at least one value of associated voltage in the memory element 150 at a nearby temperature in the range [Tmes-R, Tmes + [3], [3 being between 0.1 and 10 ° C. This makes it possible to interpolate intermediate values. In all embodiments, the method may include a prior step of providing initial voltage values associated with a plurality of temperature values in the memory element 150. This initial profile is then updated by the process steps during the life of the device.
    权利要求:
    Claims (16)
    [0001]
    REVENDICATIONS1. Luminous device (100) for a motor vehicle, the device comprising - control means (110) for supplying a plurality of light-emitting diodes, LED, mounted in series (120), each of the LEDs being characterized by the same direct voltage Vf dependent on its junction temperature; first means (130) for measuring the junction temperature of the LEDs (120); second means (140) for measuring the electrical voltage at the terminals of the assembly; processing means (160) for detecting a failure of at least one of the LEDs of the assembly, characterized in that the processing means (160) are configured to: - compare the electrical voltage across the assembly measured at a first instant given to the electrical voltage across the measured mounting at a second given instant, the comparison being conditioned by the identity of the junction temperature of the LEDs measured at first and second moments; and - detecting a failure of at least one of the LEDs of the assembly according to this comparison.
    [0002]
    2. Light device according to the preceding claim, characterized in that the device comprises a memory element (150), the processing means (160) being configured to read and write in said memory element and being configured to: - obtain ( 10) using the measuring means (130, 140) a measurement Tmes indicative of the junction temperature of at least one of the LEDs and a measurement Vmes indicative of the electrical voltage across the mounting (120) at a given instant given when the assembly (120) is energized.
    [0003]
    3. Lighting device according to the preceding claim, characterized in that the processing means (160) are further configured for: - if the memory element comprises a voltage value V ', associated with the temperature Tmes, compare (30) ) the Vmes measurement at V ', or at a comparison voltage directly dependent on V',; - conclude (50) that one of the LEDs of the assembly (120) is short-circuited according to said comparison. 3035767 13
    [0004]
    4. Lighting device according to the preceding claim, characterized in that the processing means are configured for: - if the memory element comprises a voltage value Vcal associated with the temperature Tmes, compare (30) the measurement Vmes to ( Vcal +/- a), 0 <a <Vf - conclude (50) that one of the LEDs of the circuit (120) is short-circuited if Vmes <(Vcal +/- a).
    [0005]
    5. Luminous device according to one of claims 2 to 4, characterized in that the processing means are further configured for: - if the memory element (150) does not include a voltage value associated with the measurement For example, record (20) the Vmes measure and associate it with the Tmes measure in the memory element (150). 15
    [0006]
    6. Device according to one of claims 2 to 5, characterized in that the processing means are further configured to update (40) the voltage value Vcal recorded using the value Vmes, if Vmes (Vcai +/- C).
    [0007]
    7. A method for detecting a light-emitting diode, LED, short-circuited in a light device (100) for a motor vehicle, the device comprising - driving means (110) for supplying a plurality of diodes electroluminescent LEDs, mounted in series (120), each of the LEDs being characterized by the same direct voltage Vf depending on its junction temperature; First means (130) for measuring the junction temperature of the LEDs (120); second means (140) for measuring the electrical voltage at the terminals of the assembly; processing means (160) for detecting a failure of at least one of the LEDs of the circuit, characterized in that the method comprises the following steps: comparing the electrical voltage across the measured circuit at a first instant given in FIG. the voltage at the terminals of the measured circuit at a given second instant, the comparison being conditioned by the identity of the junction temperature of the LEDs measured at the first and second instants; and - detecting a failure of at least one of the LEDs of the assembly according to this comparison. 3035767 14
    [0008]
    8. The method as claimed in claim 7, characterized in that the method comprises the following steps: obtaining (10) by means of the measuring means (130, 140) a measurement indicative of the junction temperature from at least one of the LEDs and a Vmes measurement indicative of the electrical voltage across the mounting (120) at a given time when the mounting (120) is powered.
    [0009]
    9. The method as claimed in claim 8, characterized in that the method comprises the following steps: if a memory element of the light device comprises a voltage value Vcal associated with the temperature Tmes, compare (30) the measurement Vmes with Vcal or at a comparison voltage directly dependent on Vcal; - conclude (50) that one of the LEDs of the assembly (120) is short-circuited according to said comparison.
    [0010]
    10. Method according to claim 9, characterized in that the method comprises the following steps: if the memory element comprises a voltage value Vcal associated with the temperature Tmes, compare (30) the measurement Vmes with (Vcal + / -a), 0 <a <Vf; - conclude (50) that one of the LEDs of the assembly (120) is short-circuited if Vmes <(Vcal +/- a).
    [0011]
    Method according to one of claims 8 to 10, characterized in that the method comprises the following steps: - if a memory element (150) does not include a voltage value associated with the measurement Tmes, record (20) the measurement Vmes and associate it with the Tmes measurement in the memory element (150). 30
    [0012]
    12. Method according to one of claims 8 to 11, characterized in that the method further comprises the step of updating (40) the voltage value Vcal recorded and associated with the measurement Tmes using the value Vmes, if Vmes (Voei +/- a);
    [0013]
    13. Method according to one of claims 8 to 12, characterized in that the method 35 comprises an intermediate step of filtering the measurements following the obtaining step (10), during which measurements not belonging to a range predetermined, are discarded. 3035767 15
    [0014]
    14. Method according to one of claims 8 to 13, characterized in that the steps (10) to (50) are repeated periodically. 5
    [0015]
    15. Method according to one of claims 7 to 14, characterized in that the steps (10) to (50) are implemented if the junction temperature of the LEDs and the electrical voltage across the mounting have generally constant values.
    [0016]
    16. Method according to one of claims 7 to 15, characterized in that the method 10 comprises a prior step of providing initial voltage values associated with a plurality of temperature values in the memory element (150).
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    同族专利:
    公开号 | 公开日
    CN106102204B|2020-09-29|
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    EP3089555B1|2020-05-27|
    KR20160128932A|2016-11-08|
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    US9668317B2|2017-05-30|
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    EP3089555A1|2016-11-02|
    引用文献:
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    NL2024577B1|2019-12-24|2021-09-06|Eldolab Holding Bv|LED end of life detection|
    法律状态:
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    申请号 | 申请日 | 专利标题
    FR1553888A|FR3035767B1|2015-04-29|2015-04-29|DEVICE AND METHOD FOR DETECTING A SHORT-CIRCULATED ELECTROLUMINESCENT DIODE IN A LUMINOUS DEVICE OF A MOTOR VEHICLE|FR1553888A| FR3035767B1|2015-04-29|2015-04-29|DEVICE AND METHOD FOR DETECTING A SHORT-CIRCULATED ELECTROLUMINESCENT DIODE IN A LUMINOUS DEVICE OF A MOTOR VEHICLE|
    US15/140,960| US9668317B2|2015-04-29|2016-04-28|Device and method for detecting a short-circuited light-emitting diode in a light device of a motor vehicle|
    EP16167490.8A| EP3089555B1|2015-04-29|2016-04-28|Device and method for detecting a short-circuited light-emitting diode in a motor vehicle lighting device|
    CN201610281128.9A| CN106102204B|2015-04-29|2016-04-29|Device and method for detecting a short-circuited light-emitting diode in a lamp device of a motor vehicle|
    KR1020160053100A| KR20160128932A|2015-04-29|2016-04-29|Device and method for detecting a short-circuited light-emitting diode in a light device of a motor vehicle|
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