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WO2018198284A1 - Dispositif d'éclairage à source de lumière à semi-conducteurs et phare de véhicule - Google Patents

Dispositif d'éclairage à source de lumière à semi-conducteurs et phare de véhicule Download PDF

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Publication number
WO2018198284A1
WO2018198284A1 PCT/JP2017/016804 JP2017016804W WO2018198284A1 WO 2018198284 A1 WO2018198284 A1 WO 2018198284A1 JP 2017016804 W JP2017016804 W JP 2017016804W WO 2018198284 A1 WO2018198284 A1 WO 2018198284A1
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WO
WIPO (PCT)
Prior art keywords
output
converter
current
semiconductor light
output voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/016804
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English (en)
Japanese (ja)
Inventor
祥治 加藤
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2017/016804 priority Critical patent/WO2018198284A1/fr
Publication of WO2018198284A1 publication Critical patent/WO2018198284A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/26—Circuit arrangements for protecting against earth faults
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a semiconductor light source lighting device and a vehicle lamp for lighting a semiconductor light source.
  • LEDs Light Emitting Diodes
  • DRL Daytime Running Lights
  • Headlamps are often lit by connecting multiple LEDs in series to ensure illuminance.
  • the DRL requires a small amount of illuminance, a method of diffusing light emitted from one LED by a light guide may be employed.
  • the voltage required for lighting per LED is about 2V to 4V, but the lighting device is often required to output a voltage up to about 60V in order to turn on both the headlamp and the DRL.
  • the lighting device converts the in-vehicle battery voltage into the LED driving voltage by using a step-up / down DC / DC (Direct Current / Direct Current) converter in order to light the LED. That is, the lighting device includes a step-up / step-down DC / DC converter having a power supply capability larger than the rated power of a semiconductor light source such as an LED.
  • the LED is lit by a constant current output from the step-up / step-down DC / DC converter.
  • the lighting device includes a current measurement circuit that measures the output current of the step-up / step-down DC / DC converter, a current control circuit that performs feedback control of the output current of the step-up / step-down DC / DC converter using the measurement result, Is provided.
  • a current measurement circuit that measures the output current of the step-up / step-down DC / DC converter
  • a current control circuit that performs feedback control of the output current of the step-up / step-down DC / DC converter using the measurement result, Is provided.
  • a plurality of circuit configurations are conceivable as the current measuring circuit, but there is a circuit configuration using an inverting amplifier circuit that accurately measures with a small number of parts.
  • the current measuring circuit is disposed between the ground and the secondary side of the insulated buck-boost DC / DC converter. The output current flowing on the secondary side is measured (see, for example, Patent Document 1).
  • the current measuring circuit is 2
  • the current control circuit measures the current flowing through the secondary side and performs feedback control. When the short-circuit failure occurs, the output load becomes small, and the amount of operation of the current control circuit becomes too large for the output load, so that the output voltage tends to oscillate.
  • the present invention has been made to solve the above-described problems, and an object thereof is to determine a short-circuit failure in which an output voltage oscillates.
  • a semiconductor light source lighting device includes a DC / DC converter that converts an input voltage into an output voltage and supplies the output voltage to one or more semiconductor light sources, an output voltage measurement unit that measures an output voltage of the DC / DC converter, An output current measuring unit that is arranged between the ground connected to the low potential side of the secondary side of the DC / DC converter and the low potential side and measures the output current flowing to the secondary side, and measurement of the output current measuring unit An output current control unit for controlling the output current of the DC / DC converter to be a driving current for lighting one or more semiconductor light sources based on the value, a high potential side on the secondary side of the DC / DC converter, and one A short determination unit that determines a short-circuit failure with a semiconductor light source connected to the highest potential side of the semiconductor light sources.
  • the short determination unit lights one or more semiconductor light sources with a drive current.
  • the Each of the first threshold voltage lower than the output voltage of the DC / DC converter and the second threshold voltage lower than the first threshold voltage, and the measured value of the output voltage measuring unit is the first When the voltage drops below the threshold voltage, it is determined that a short-circuit failure may have occurred, and a current change instruction is issued to the output current control unit. Based on the current change instruction, the output current of the DC / DC converter is When the measured value of the output voltage measurement unit falls below the second threshold voltage in the changed state, it is determined that a short circuit fault has occurred, and the output current control unit receives a current change instruction from the short determination unit. In this case, the output current of the DC / DC converter is controlled to be a test current lower than the drive current.
  • the output current of the DC / DC converter is converted to the drive current. If the measured value of the output voltage measurement unit drops below the second threshold voltage when the output current of the DC / DC converter is changed based on the current change instruction, the short circuit fault occurs. Therefore, it is possible to determine a short-circuit failure in which the output voltage oscillates.
  • FIG. 1 is a circuit diagram showing a configuration example of a semiconductor light source lighting device 10 according to Embodiment 1 of the present invention.
  • the battery 1, the LED 2, and the semiconductor light source lighting device 10 constitute a DRL vehicle lamp.
  • the battery 1 is a power source that supplies an input voltage to the semiconductor light source lighting device 10.
  • the LED 2 is a semiconductor light source used as a DRL.
  • the semiconductor light source is not limited to the LED, and may be a laser diode or the like.
  • the semiconductor light source lighting device 10 mainly includes a step-up / step-down DC / DC converter 11, an output voltage measurement unit 17, an output current measurement unit 18, an output current control unit 19, and a short determination unit 20.
  • a step-up / step-down DC / DC converter 11 an output voltage measurement unit 17, an output current measurement unit 18, an output current control unit 19, and a short determination unit 20.
  • the rectifier circuit, the smoothing circuit, and the like are not shown.
  • the step-up / step-down DC / DC converter 11 converts the input voltage supplied from the battery 1 into an output voltage supplied to the LED 2.
  • the step-up / step-down DC / DC converter 11 is, for example, a flyback type step-up / step-down DC / DC converter using an insulating transformer. Note that the step-up / step-down DC / DC converter 11 is not limited to the flyback type step-up / step-down DC / DC converter, and can convert the input voltage supplied from the battery 1 to a voltage lower or higher. I just need it. Therefore, the semiconductor light source lighting device 10 is used for the purpose of lighting one LED 2 for DRL in the configuration example of FIG. 1, but instead of one LED 2 for DRL, it is connected in series for a headlamp. It is also possible to turn on a plurality of connected LEDs 2.
  • the high potential side input terminal 12 is a terminal for connecting the high potential side of the primary winding of the step-up / step-down DC / DC converter 11 to the high potential side of the battery 1.
  • the low potential side input terminal 13 is a terminal for connecting the low potential side of the primary winding of the step-up / step-down DC / DC converter 11 and the low potential side of the battery 1.
  • a switching element 21 is connected between the low potential side input terminal 13 of the primary winding of the step-up / step-down DC / DC converter 11.
  • the high potential side output terminal 14 is a terminal for connecting the high potential side of the secondary winding of the step-up / step-down DC / DC converter 11 and the anode of the LED 2.
  • the low potential side output terminal 15 is a terminal for connecting the low potential side of the secondary winding of the step-up / step-down DC / DC converter 11 and the cathode of the LED 2.
  • the low potential side of the secondary winding of the step-up / step-down DC / DC converter 11 is connected to the ground 16.
  • the output voltage measurement unit 17 is connected to both ends of the secondary winding of the step-up / step-down DC / DC converter 11, measures the output voltage of the step-up / step-down DC / DC converter 11, and outputs the measured value to the short determination unit 20.
  • the output voltage measuring unit 17 is, for example, a voltage dividing circuit using a resistor or the like, and the output voltage of the step-up / step-down DC / DC converter 11 is converted to a voltage that the short determination unit 20 can perform A / D (Analog / Digital) conversion on. Convert.
  • the output current measuring unit 18 is disposed between the low potential side of the secondary winding of the step-up / step-down DC / DC converter 11 and the ground 16 and measures the output current of the step-up / step-down DC / DC converter 11 to control the output current.
  • the output current measuring unit 18 is, for example, a circuit combining a shunt resistor and an inverting amplifier, and converts the current flowing through the shunt resistor into a voltage that can be A / D converted by the output current control unit 19.
  • the output current control unit 19 controls the output current of the step-up / step-down DC / DC converter 11 based on the measurement value of the output current measurement unit 18.
  • the output current control unit 19 determines the operation amount so that the measured value of the output current measurement unit 18 and the target current value are equal by feedback control, and the duty ratio according to the determined operation amount.
  • the switching element 21 is driven on and off.
  • the short determination unit 20 determines a short failure of the LED 2 based on the measurement value of the output voltage measurement unit 17. When the position 22 indicated by “x” is grounded on the signal line connecting the high potential side output terminal 14 and the LED 2, the short determination unit 20 determines this ground fault as a short fault. When a plurality of LEDs 2 are connected in series between the high-potential side output terminal 14 and the low-potential side output terminal 15, the short determination unit 20 is the highest potential side output terminal of these LEDs 2. A ground fault between the LED 2 arranged on the 14 side and the high potential side output terminal 14 is determined as a short circuit failure.
  • FIG. 2 is a graph showing output voltages at the time of normal lighting and a short circuit failure in the semiconductor light source lighting device 10 according to the first embodiment of the present invention.
  • the horizontal axis of the graph is time, and the vertical axis is the output voltage of the step-up / step-down DC / DC converter 11 measured by the output voltage measuring unit 17 for each sampling period.
  • the output voltage measured by the output voltage measuring unit 17 is stable during normal lighting when no short failure has occurred. On the other hand, when a short circuit failure occurs, the output voltage measured by the output voltage measuring unit 17 oscillates.
  • the short determination unit 20 determines a short failure in two stages using two types of thresholds for determining a short failure.
  • FIG. 3 is a flowchart showing an operation example of the semiconductor light source lighting device 10 according to the first embodiment of the present invention.
  • the semiconductor light source lighting device 10 repeatedly performs the operation shown in the flowchart of FIG. Steps ST1 to ST8 are first stage short circuit failure determinations, and steps ST9 to ST12 are second stage short circuit failure determinations.
  • the short determination unit 20 compares the output voltage measured by the output voltage measurement unit 17 with the latest sampling cycle with a predetermined first threshold voltage.
  • the first threshold voltage is: The voltage is lower than the drive voltage at the smallest number of lighting.
  • the output voltage becomes less than the first threshold voltage, a short circuit failure of the LED 2 is suspected.
  • the short determination unit 20 is not determined as a short failure at this time.
  • step ST1 “NO” When the output voltage measured by the output voltage measurement unit 17 is equal to or higher than the first threshold voltage (step ST1 “NO”), the short determination unit 20 proceeds to step ST2. If the output voltage measured by the output voltage measurement unit 17 is less than the first threshold voltage (step ST1 “YES”), the short determination unit 20 proceeds to step ST3.
  • step ST2 the short determination unit 20 determines that no short failure has occurred. Therefore, the output current control unit 19 performs constant current control of the step-up / step-down DC / DC converter 11 so as to continue the normal lighting of the LED 2.
  • step ST3 the short determination unit 20 starts a built-in timer (not shown).
  • step ST4 when the time measured by the timer is less than the predetermined time (step ST4 “NO”), the short determination unit 20 proceeds to step ST5, and when the time measured by the timer has passed the predetermined time (step ST4). “YES”), go to step ST7.
  • step ST5 the short determination unit 20 compares the output voltage measured by the output voltage measurement unit 17 with the latest sampling period and the first threshold voltage. When the output voltage measured by the output voltage measurement unit 17 is less than the first threshold voltage (step ST5 “YES”), the short determination unit 20 proceeds to step ST6, and the output voltage measured by the output voltage measurement unit 17 is When the voltage is equal to or higher than the first threshold voltage (step ST5 “NO”), the process returns to step ST4.
  • step ST6 the short determination unit 20 counts the number of determinations in which the output voltage is determined to be less than the first threshold voltage in step ST5, and returns to step ST4.
  • step ST7 when the number of determinations in the predetermined time is less than or equal to the predetermined number of times (step ST7 “NO”), the cause that the output voltage has become less than the first threshold voltage is not a short circuit failure but noise or the like. It is determined that the output voltage measuring unit 17 is malfunctioning due to the disturbance of, and the process proceeds to step ST8. On the other hand, if the number of determinations in the predetermined time is larger than the predetermined number (step ST7 “YES”), the short determination unit 20 proceeds to step ST9 to determine the second stage because a short failure is suspected.
  • step ST8 the short determination unit 20 resets the number of determinations, and proceeds to step ST2.
  • step ST9 the short determination unit 20 instructs the output current control unit 19 to set the output current of the step-up / step-down DC / DC converter 11 to the inspection current.
  • the output current control unit 19 changes the output current of the step-up / step-down DC / DC converter 11 to a test current.
  • the output current control unit 19 may change the output current of the step-up / step-down DC / DC converter 11 to the inspection current by setting the target current value of the feedback control to the inspection current, or the duty ratio for driving the switching element 21 on and off. May be changed to a test current by changing the output current of the step-up / step-down DC / DC converter 11 to a value corresponding to the test current.
  • FIG. 4 is a graph showing the output voltage during normal operation and in the supply of the inspection current at the time of short-circuit in the semiconductor light source lighting device 10 according to the first embodiment of the present invention.
  • the horizontal axis of the graph is time, and the vertical axis is the output voltage of the step-up / step-down DC / DC converter 11 measured by the output voltage measuring unit 17 for each sampling period.
  • step ST10 the short determination unit 20 compares the output voltage measured by the output voltage measurement unit 17 with the latest sampling cycle with a predetermined second threshold voltage.
  • the short determination unit 20 proceeds to step ST11, and the output voltage measured by the output voltage measurement unit 17 is When the voltage is less than the second threshold voltage (step ST10 “YES”), the process proceeds to step ST12.
  • step ST11 the short determination unit 20 determines that no short failure has occurred, and instructs the output current control unit 19 to return the inspection current to the drive current during normal lighting.
  • the output current control unit 19 receives this instruction from the short determination unit 20, the output current control unit 19 changes the output current of the step-up / step-down DC / DC converter 11 from the inspection current to the drive current during normal lighting.
  • step ST12 the short determination unit 20 determines that the LED 2 has a short circuit failure. Since the output voltage during energization of the inspection current at the time of the short fault shown in FIG. 4 is more stable than the output voltage during energization of the drive current at the time of the short fault shown in FIG. 2, two steps using the second threshold voltage are used. The time required for the eye determination can be shorter than the time required for the first stage determination using the first threshold voltage. In the flowchart of FIG. 3, the time required for the second stage determination (step ST10) using the second threshold voltage is one sampling period in which the output voltage measurement unit 17 measures the output voltage.
  • the determination method based on time is exemplified as the first step determination using the first threshold voltage.
  • the determination method is not limited to this method, and the determination based on the ratio may be performed.
  • the short determination unit 20 starts counting the number of sampling times of the output voltage. Thereafter, when the number of times of sampling reaches a predetermined number, the short determination unit 20 suspects a short failure when the ratio of the number of determinations counted in step ST6 to the number of times of sampling is larger than the predetermined ratio in step ST7. Proceed to
  • FIG. 5A and 5B are diagrams showing hardware configuration examples of the output current control unit 19 and the short determination unit 20 according to Embodiment 1 of the present invention.
  • Each function of the output current control unit 19 and the short determination unit 20 is realized by a processing circuit. That is, the semiconductor light source lighting device 10 includes a processing circuit for realizing the above functions.
  • the processing circuit may be the processing circuit 100 as dedicated hardware, or may be the processor 101 that executes a program stored in the memory 102.
  • the processing circuit 100 when the processing circuit 100 is dedicated hardware, the processing circuit 100 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), or the like. ), FPGA (Field Programmable Gate Array), or a combination thereof.
  • the functions of the output current control unit 19 and the short determination unit 20 may be realized by a plurality of processing circuits 100, or the functions of each unit may be realized by a single processing circuit 100.
  • each function of the output current control unit 19 and the short determination unit 20 is realized by software, firmware, or a combination of software and firmware.
  • Software or firmware is described as a program and stored in the memory 102.
  • the processor 101 reads out and executes a program stored in the memory 102, thereby realizing the function of each unit. That is, the semiconductor light source lighting device 10 includes a memory 102 for storing a program that, when executed by the processor 101, results in the steps shown in the flowchart of FIG. Further, it can be said that this program causes a computer to execute the procedure or method of the output current control unit 19 and the short determination unit 20.
  • the processor 101 is a CPU (Central Processing Unit), a processing device, an arithmetic device, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like.
  • the memory 102 may be a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), or a flash memory, or a hard disk or a flexible disk.
  • the magnetic disk may be an optical disk such as a CD (Compact Disc) or a DVD (Digital Versatile Disc).
  • the memory 102 also stores information such as the first threshold voltage, the second threshold voltage, and the inspection current.
  • the processing circuit in the semiconductor light source lighting device 10 can realize the above-described functions by hardware, software, firmware, or a combination thereof.
  • the semiconductor light source lighting device 10 includes the step-up / step-down DC / DC converter 11 that converts the input voltage into the output voltage and supplies the output voltage to one or more LEDs 2, and the step-up / step-down DC / DC converter.
  • An output voltage measuring unit 17 that measures the output voltage of the step-up / step-down DC / DC converter 11 and an output current measuring unit 18 that is arranged between the secondary side of the step-up / step-down DC / DC converter 11 and the ground 16 and measures the output current flowing to the secondary side.
  • An output current control unit 19 for controlling the output current of the step-up / step-down DC / DC converter 11 to be a drive current for lighting one or more LEDs 2 based on the measurement value of the output current measuring unit 18;
  • a short determination unit 20 that determines a short circuit failure between the secondary high potential side of the DC converter 11 and the LED 2 connected to the highest potential side of the one or more LEDs 2.
  • the short determination unit 20 has each value of the first threshold voltage and the second threshold voltage, and a short failure occurs when the measurement value of the output voltage measurement unit 17 falls below the first threshold voltage.
  • the output current control unit 19 is instructed to change the test current and the output current of the step-up / step-down DC / DC converter 11 is changed based on the test current change instruction.
  • the output current control unit 19 controls the output current of the step-up / step-down DC / DC converter 11 to be an inspection current lower than the drive current.
  • the inspection current is 1 ⁇ 2 or less of the drive current, even when the output load of the step-up / step-down DC / DC converter 11 is reduced due to a short circuit failure, oscillation is suppressed and stable.
  • the output voltage can be supplied. Therefore, it is possible to more reliably determine a short circuit failure by comparing the stable output voltage with the second threshold voltage.
  • the measured value of the output voltage measuring unit 17 is greater than the first threshold voltage from the time required to determine that the measured value of the output voltage measuring unit 17 has dropped below the second threshold voltage. Since the time required to determine that the voltage has dropped is set longer, the influence of noise and the like can be eliminated when comparing the oscillating output voltage with the first threshold voltage, and a short-circuit failure can be determined more reliably. Can do.
  • the vehicle lamp according to the first embodiment includes a semiconductor light source lighting device 10 including one LED 2 and a step-up / step-down DC / DC converter 11 having a power supply capability that is twice or more the rated power of the single LED 2. Consists of.
  • the semiconductor light source lighting device 10 needs to include a step-up / step-down DC / DC converter 11 having a large power supply capability. If the power supply capability of the step-up / step-down DC / DC converter 11 is large, as described above, if a short circuit failure occurs when the DRL is lit, the output voltage oscillates and the normal output voltage and the peak value of the oscillated output voltage are close to each other. Therefore, it is difficult to distinguish between normal lighting and a short circuit failure. Even in such a case, the short failure can be reliably determined by the short determination method of the short determination unit 20.
  • any component of the embodiment can be modified or any component of the embodiment can be omitted within the scope of the invention.
  • the semiconductor light source lighting device is suitable for use in a lighting device for a vehicle lamp having a light source for DRL since it determines a short-circuit failure in which output power oscillates.
  • 1 battery 2 LED, 10 semiconductor light source lighting device, 11 buck-boost DC / DC converter, 12 high potential side input terminal, 13 low potential side input terminal, 14 high potential side output terminal, 15 low potential side output terminal, 16 ground , 17 output voltage measurement unit, 18 output current measurement unit, 19 output current control unit, 20 short determination unit, 21 switching element, 22 short fault location, 100 processing circuit, 101 processor, 102 memory.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

Lorsque la valeur de mesure d'une unité de mesure de tension de sortie (17) chute sous une première tension de valeur seuil, une unité de détermination de court-circuit (20) détermine qu'il est possible qu'un risque d'une défaillance de court-circuit survienne, et envoie une instruction de changement de courant d'inspection à une unité de commande de courant de sortie (19). L'unité de commande de courant de sortie (19) commande de telle sorte que le courant de sortie d'un convertisseur CC/CC élévateur/abaisseur (11) est à un courant d'inspection inférieur à un courant d'attaque. L'unité de détermination de court-circuit (20) confirme ensuite qu'une défaillance de court-circuit se produit lorsque la valeur de mesure de l'unité de mesure de tension de sortie (17) chute sous une seconde tension de valeur seuil.
PCT/JP2017/016804 2017-04-27 2017-04-27 Dispositif d'éclairage à source de lumière à semi-conducteurs et phare de véhicule Ceased WO2018198284A1 (fr)

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PCT/JP2017/016804 WO2018198284A1 (fr) 2017-04-27 2017-04-27 Dispositif d'éclairage à source de lumière à semi-conducteurs et phare de véhicule

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PCT/JP2017/016804 WO2018198284A1 (fr) 2017-04-27 2017-04-27 Dispositif d'éclairage à source de lumière à semi-conducteurs et phare de véhicule

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009111035A (ja) * 2007-10-26 2009-05-21 Panasonic Electric Works Co Ltd 発光ダイオード駆動装置、発光ダイオード駆動装置を用いた照明装置、車室内用照明装置、車両用照明装置
JP2015026547A (ja) * 2013-07-26 2015-02-05 パナソニックＩｐマネジメント株式会社 発光素子点灯装置、発光モジュール、照明装置及び発光素子の点灯方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009111035A (ja) * 2007-10-26 2009-05-21 Panasonic Electric Works Co Ltd 発光ダイオード駆動装置、発光ダイオード駆動装置を用いた照明装置、車室内用照明装置、車両用照明装置
JP2015026547A (ja) * 2013-07-26 2015-02-05 パナソニックＩｐマネジメント株式会社 発光素子点灯装置、発光モジュール、照明装置及び発光素子の点灯方法

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