WO2021020538A1 - Module de lampe et circuit d'éclairage associé - Google Patents

Module de lampe et circuit d'éclairage associé Download PDF

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Publication number
WO2021020538A1
WO2021020538A1 PCT/JP2020/029348 JP2020029348W WO2021020538A1 WO 2021020538 A1 WO2021020538 A1 WO 2021020538A1 JP 2020029348 W JP2020029348 W JP 2020029348W WO 2021020538 A1 WO2021020538 A1 WO 2021020538A1
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WO
WIPO (PCT)
Prior art keywords
light emitting
current
lighting
current amount
lighting mode
Prior art date
Application number
PCT/JP2020/029348
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English (en)
Japanese (ja)
Inventor
知幸 市川
Original Assignee
株式会社小糸製作所
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 株式会社小糸製作所 filed Critical 株式会社小糸製作所
Priority to CN202080040768.5A priority Critical patent/CN113940142A/zh
Priority to JP2021535445A priority patent/JP7430188B2/ja
Publication of WO2021020538A1 publication Critical patent/WO2021020538A1/fr

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    • 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
    • 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
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • 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
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/30—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating rear of vehicle, e.g. by means of reflecting surfaces
    • 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
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/32—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating vehicle sides, e.g. clearance lights
    • 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
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/44—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal
    • 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
    • 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
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to a lamp module used in an automobile or the like.
  • the automobile is equipped with various lamps such as high beam, low beam, clearance lamp (position lamp), daytime running lamp (DRL: Daytime Running Lamp), stop lamp, tail lamp, etc.
  • various lamps such as high beam, low beam, clearance lamp (position lamp), daytime running lamp (DRL: Daytime Running Lamp), stop lamp, tail lamp, etc.
  • the present invention has been made in such a situation, and one of the exemplary purposes of the embodiment is to provide a lamp module or a lighting circuit capable of switching the functions of two lamps.
  • One aspect of the present invention relates to a lighting circuit that is used for a lamp whose first lighting mode and second lighting mode can be switched and drives a light emitting string including a plurality of light emitting elements.
  • the lighting circuit in the first lighting mode, the time average of the drive current flowing through the light emitting string is stabilized to the first current amount, and (ii) in the second lighting mode, the time average of the drive current is the first current amount.
  • It includes a drive circuit that stabilizes to a smaller second current amount and a plurality of bypass switches. Each of the plurality of bypass switches is connected in parallel with at least one of the plurality of light emitting elements.
  • the drive circuit When the drive circuit detects an abnormal state in which no current flows through the light emitting string in the second lighting mode, the drive circuit changes the on / off state of each of the plurality of bypass switches to search for a recovery state in which current flows through the light emitting string.
  • a plurality of bypass switches are set in the recovery state to stabilize the time average of the drive current flowing through the light emitting string to a third current amount larger than the second current amount.
  • the light emitting string breaks down, it is possible to prevent the light emitting string from being unable to light by bypassing the broken part.
  • the number of light emitting elements that can be lit decreases and the amount of light decreases.
  • the time average of the drive current flowing through the light emitting string should be increased compared to the normal state. Therefore, the decrease in the amount of light can be suppressed.
  • the light emitting string may include N light emitting elements.
  • the third current amount may be N / K times the second current amount.
  • the light emitting string is divided into M groups, each containing the same number of light emitting elements, and the plurality of bypass switches may include M bypass switches.
  • the third current amount may be M / (M-1) times the second current amount.
  • the first lighting mode may be a stop lamp, and the second lighting mode may be a tail lamp.
  • the first lighting mode may be a daytime running lamp, and the second lighting mode may be a clearance lamp.
  • the lamp module includes a light emitting string including a plurality of light emitting elements, and any of the above-mentioned lighting circuits for driving the light emitting string.
  • the "state in which the member A is connected to the member B” means that the member A and the member B are physically directly connected, and that the member A and the member B are electrically connected to each other. It also includes the case of being indirectly connected via other members, which does not substantially affect the connection state, or does not impair the functions and effects performed by the combination thereof.
  • a state in which the member C is provided between the member A and the member B means that the member A and the member C, or the member B and the member C are directly connected, and their electricity. It also includes the case of being indirectly connected via other members, which does not substantially affect the connection state, or does not impair the functions and effects performed by the combination thereof.
  • the reference numerals attached to electric signals such as voltage signals and current signals, or circuit elements such as resistors and capacitors have their respective voltage values, current values, resistance values and capacitance values as required. It shall be represented.
  • FIG. 1 is a block diagram of a lamp system 1 including the lamp module 100 according to the embodiment.
  • the lamp system 1 includes a battery 2, a switch 4, a vehicle-side ECU (Electronic Control Unit) 6, and a lamp 10.
  • the vehicle lamp 10 includes a high beam 12, a low beam 14, and a lamp module 100.
  • the lamp module 100 is in charge of the first function and the second function among the plurality of functions of the vehicle lamp 10, and the first function and the second function can be switched.
  • the vehicle lamp 10 is a headlight (headlamp)
  • the first function is a daytime running lamp (denoted as DRL)
  • the second function is a clearance lamp (denoted as CLR). Is.
  • the lamp module 100 includes a light emitting string 110 and a lighting circuit 200, which are unitized, and the finished product of the lamp module 100 is assembled to the vehicle lamp 10.
  • the light emitting string 110 includes a plurality of N (N ⁇ 2) light emitting elements 112 connected in series.
  • the light emitting element 112 is, for example, an LED (light emitting diode), but may be another semiconductor light emitting element such as an LD (laser diode) or an organic EL (Electro Luminescence) element.
  • the number N of the light emitting elements 112 may be 3 or larger than 4.
  • the voltage (battery voltage) V BAT from the battery 2 is supplied to the lighting circuit 200 as a power source via the switch 4. Further, the lighting instruction DRL of the daytime running lamp or the lighting instruction CLR of the clearance lamp is input from the vehicle side ECU 6.
  • the lighting circuit 200 operates in the first lighting mode when receiving the lighting instruction of the DRL, causes the light emitting string 110 to emit light with the first light amount, and operates in the second lighting mode when receiving the lighting instruction of the DRL, and emits light.
  • the string 110 is made to emit light with a second amount of light smaller than the first amount of light.
  • the lighting circuit 200 includes a drive circuit 210 and a plurality of bypass switches SW1 and SW2.
  • the drive circuit 210 stabilizes the time average of the drive current I LED flowing through the light emitting string 110 to (i) the first current amount I REF1 in the first lighting mode, and (ii) the drive current I LED in the second lighting mode. Is stabilized to the second current amount I REF2, which is smaller than the first current amount I REF1 .
  • the drive circuit 210 may control the time average of the drive current I LED by DC dimming, may control the time average of the drive current I LED by PWM (Pulse Width Modulation) dimming, or may control the time average of the drive current I LED .
  • the time average of the drive current I LED may be controlled by the combination.
  • the plurality of bypass switches SW1 and SW2 correspond to a plurality of groups when the plurality of light emitting elements 112_1 to 112_4 are divided into a plurality of groups each including at least one light emitting element.
  • the bypass switch SW1 is connected in parallel with the pair of light emitting elements 112_1 and 112_2, which is the first group, and the bypass switch SW2 is connected in parallel with the pair of light emitting elements 112_3, 112_4, which is the second group.
  • the plurality of bypass switches SW1 and SW2 are fixed to off in the normal state, and therefore the drive current I LED flowing through the light emitting string 110 is equal to the output current I OUT of the drive circuit 210.
  • the drive circuit 210 is configured to be able to detect an abnormal state in which the drive current I LED does not flow through the light emitting string 110.
  • the drive circuit 210 detects this abnormal state in the second lighting mode, it changes the on / off state of each of the plurality of bypass switches SW1 and SW2, searches for recovery in which the drive current I LED flows through the light emitting string 110, and recovers.
  • the plurality of bypass switches SW1 and SW2 are set to the recovery state, and the time average of the drive current I LED flowing through the light emitting string 110 is larger than the second current amount I REF2 .
  • the amount of current is stabilized to I REF3 . This is called an abnormal lighting mode.
  • the DC current amount of the output current I OUT may be doubled, and when the drive circuit 210 is compatible with PWM dimming, the output current I The duty ratio of OUT may be doubled.
  • FIG. 2 is a time chart illustrating the operation of the lamp module 100 of FIG.
  • the drive circuit 210 operates in the first lighting mode.
  • the drive circuit 210 generates an output current I OUT whose time average is stabilized at the first current amount I REF1 and supplies it to the light emitting string 110 as a drive current I LED .
  • the drive circuit 210 is shifted to the second lighting mode.
  • the drive circuit 210 generates an output current I OUT whose time average is stabilized to a second current amount I REF2, and supplies the light emitting string 110 as a drive current I LED .
  • the wire between the light emitting elements 112_3 and 112_4 is broken.
  • the output current I OUT of the driver circuit 210 does not flow, the drive circuit 210 at time t 4 detects this as an abnormal state.
  • the drive circuit 210 changes the on / off combination of the plurality of bypass switches SW1 and SW2. For example, the drive circuit 210 turns on the plurality of bypass switches SW1 to SW2 one by one in order, and searches for a recovery state in which the current cutoff is released. Specifically, to turn on the bypass switch SW1 at time t 5. At this time, since the output current I OUT is still cut off, the abnormality detection state is maintained.
  • the bypass switch SW2 is turned on.
  • the disconnection portion is bypassed, the drive current I LED flows to the path including the light emitting elements 112_1, 112_2 and the bypass switch SW2, and the current interruption is released. That is, the state in which SW1 is off and SW2 is on is the recovery state.
  • the drive circuit 210 stores the state of the switch SW1, SW2 of this time (recovery condition), the time t 7 after, to fix the state of the switch SW1, SW2. Further, the drive circuit 210 increases the output current I OUT of the drive circuit 210 to the third current amount I REF3 , and shifts to the abnormal lighting mode. As a result, among the light emitting strings 110, the light emitting elements 112_1 and 112_2 are driven by the drive current I LED of the third current amount I REF3 .
  • a lamp having a daytime running time and a clearance lamp function can be modularized.
  • the assembly of the vehicle lighting fixture 10 can be simplified as compared with the case where the daytime running time and the clearance lamp are separately unitized.
  • a single light emitting string 110 is also used, and by driving by a single drive circuit 210, the number of parts and the cost can be reduced, and the size of the lamp module 100 can be reduced. it can.
  • this lamp module 100 even if the light emitting string 110 is broken, it is possible to prevent the light emitting string 110 from being unable to light by searching for the broken part and bypassing the broken part.
  • the number of light emitting elements 112 that can be lit decreases and the amount of light decreases, but the time average of the drive current I LED flowing through the light emitting string 110 is compared with the normal state so as to compensate for the decrease in the number.
  • the time average of the drive current I LED flowing through the light emitting string 110 is compared with the normal state so as to compensate for the decrease in the number.
  • the four light emitting elements 112_1 to 112_4 can be lit in the normal state, and the two light emitting elements 112_1 and 112_2 can be lit in the abnormal state, but the drive current is doubled. Therefore, the amount of light in the abnormal state can be made equal to the amount of light in the normal state.
  • the lamp module 100 even if the light emitting string 110 is disconnected, at least the function as a clearance lamp can be preserved.
  • the drive circuit 210 is stopped because the amount of light is insufficient.
  • the present invention extends to various devices and methods that are grasped as the block diagram or circuit diagram of FIG. 1 or derived from the above description, and are not limited to a specific configuration.
  • more specific configuration examples and examples will be described not to narrow the scope of the present invention but to help understanding the essence and operation of the invention and to clarify them.
  • FIG. 3 is a block diagram showing a configuration example of the drive circuit 210.
  • the drive circuit 210 includes a constant current driver 212, an abnormality detection circuit 214, and a controller 216.
  • the constant current driver 212 may be a linear regulator with a constant current output, a switching converter (DC / DC converter) with a constant current output, or a combination of a switching converter with a constant voltage output and a constant current circuit. It may be.
  • the constant current driver 212 stabilizes the time average of the output current I OUT to the current amount I REF indicated by the controller 216.
  • the abnormality detection circuit 214 detects a disconnection failure in which the drive current I LED does not flow through the light emitting string 110. For example, the abnormality detection circuit 214 monitors the output current I OUT of the constant current driver 212, and determines that the abnormality state is when the output current I OUT falls below a predetermined threshold value.
  • the controller 216 instructs the constant current driver 212 to indicate the first current amount I REF1 in the first lighting mode and the second current amount I REF2 in the second lighting mode.
  • the controller 216 changes the combination of the on / off states of the plurality of bypass switches SW1 and SW2, identifies the disconnection location, and turns on the bypass switch parallel to the disconnection location. Fix everything else off. Further, in the second lighting mode, the constant current driver 212 is instructed to instruct the third current amount I REF3 .
  • the drive circuit 210 of FIG. 4A includes a step-down converter 230 and a converter controller 232.
  • the buck converter 230 includes a switching transistor M1, a rectifying element D1, an inductor L1, a capacitor C1, and a sense resistor Rs.
  • the sense resistors Rs are provided on the path of the drive current I OUT .
  • a synchronous rectification type using a transistor may be adopted as the rectifying element D1. Further, when the number M of the light emitting elements 122 connected in series is large, a boost converter can be used.
  • the drive circuit 210 may be configured by a linear regulator.
  • the linear regulator may be a current source type as shown in FIG. 4 (b) or a current sink type (not shown).
  • FIG. 5 is a circuit diagram of the lamp module 100A according to the first modification.
  • the controller 216 of the drive circuit 210A switches the bypass switches SW1 to SW4 on and off to identify the disconnection location.
  • the number of bypass switches that can be turned on at the same time is not limited to one or two, and three or more bypass switches may be used so as to deal with disconnection failures at three or more locations.
  • the third current amount I REF3 is the third. 2
  • Modification 3 The same process can be performed even when a disconnection failure occurs during the first lighting mode. That is, when a disconnection failure is detected during the first lighting mode, the bypass switch is turned on and off to search for a recovery state in which the disconnection portion is bypassed. Then, the plurality of bypass switches are fixed in the recovery state, and the time average of the drive current I LED is set to the third current amount I REF3 . As a result, when a lighting instruction in the DRL is given, the lamp can be lit as a clearance lamp instead of the DRL. During the search period for the disconnection point, the output current I OUT of the drive circuit 210 may be changed from the first current amount I REF1 to the second current amount I REF2 .
  • the function of the daytime running lamp may be maintained in addition to the function of the clearance lamp. Specifically, when the daytime running lamp is lit, that is, in the first lighting mode, when an abnormal state is detected, the disconnection point is searched for, the disconnection point is short-circuited by the bypass switch parallel to it, and the drive current is charged. The time average may be increased to a fourth current amount larger than the first current amount.
  • the light emitting string 110 including the M light emitting elements 112 when the number of light emitting elements through which the drive current is flowing in the state where the current cutoff is released is K, the fourth current amount I REF4 is the first current amount I. It may be N / K times as large as REF1 .
  • the time average of the drive current I LED in each mode is changed by changing the time average of the output current I OUT of the drive circuit 210, but this is not the case.
  • the output current I OUT of the drive circuit 210 may be constant regardless of the lighting mode, and the time average of the drive current I LED in each lighting mode may be controlled by PWM dimming using the bypass switch SW. ..
  • the on-duty ratio of the bypass switch SW # and the lighting duty ratio of the light emitting element 112_ # in parallel with it have a complementary relationship. For example, when the on-duty ratio of the bypass switch SW # is d%, the lighting duty ratio of the light emitting element 112_ # is (100 ⁇ d)%.
  • I REF2 ⁇ ⁇ I REF1 It is assumed that the relationship of is established. However, 0 ⁇ ⁇ 1.
  • I REF3 ⁇ ⁇ I REF2 It is assumed that the relationship of is established. However, 1 ⁇ .
  • the first lighting mode is associated with the DRL and the second lighting mode is associated with the clearance lamp, but the present invention is not limited to this, and the first lighting mode may be associated with the stop lamp and the second lighting mode may be associated with the tail lamp.
  • the present invention relates to a lamp module used in an automobile or the like.
  • Lighting system 2 Battery 4 Switch 6 Vehicle side ECU 10 Vehicle lighting equipment 12 High beam 14 Low beam 100 Lighting equipment module 110 Light emitting string 112 Light emitting element 200 Lighting circuit SW1, SW2 Bypass switch 210 Drive circuit 212 Constant current driver 214 Abnormality detection circuit 216 Controller

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

Un circuit d'attaque (210) stabilise la moyenne de temps d'un courant d'attaque (ILED) s'écoulant dans une chaîne électroluminescente (110) à une première quantité de courant (IREF1) lorsqu'il est dans un premier mode d'éclairage et stabilise la moyenne de temps du courant d'attaque (ILED) à une seconde quantité de courant (IREF2) qui est inférieure à la première quantité de courant (IREF1) lorsqu'il est dans un second mode d'éclairage. Le circuit d'attaque (210), lors de la détection d'un état anormal dans lequel aucun courant ne circule dans la chaîne électroluminescente (110) pendant qu'il est dans le second mode d'éclairage, change les états de marche et d'arrêt de chacun d'une pluralité de commutateurs de dérivation (SW1 et SW2) pour rechercher un état dans lequel un courant circule dans la chaîne électroluminescente (110) et fixe cet état. Ensuite, le circuit d'attaque stabilise la moyenne temporelle du courant d'attaque (ILED) circulant dans la chaîne électroluminescente (110) jusqu'à une troisième quantité de courant (IREF3) qui est supérieure à la seconde quantité de courant (IREF2).
PCT/JP2020/029348 2019-08-01 2020-07-30 Module de lampe et circuit d'éclairage associé WO2021020538A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080040768.5A CN113940142A (zh) 2019-08-01 2020-07-30 灯具模块及其点亮电路
JP2021535445A JP7430188B2 (ja) 2019-08-01 2020-07-30 灯具モジュールおよびその点灯回路

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-142223 2019-08-01
JP2019142223 2019-08-01

Publications (1)

Publication Number Publication Date
WO2021020538A1 true WO2021020538A1 (fr) 2021-02-04

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PCT/JP2020/029348 WO2021020538A1 (fr) 2019-08-01 2020-07-30 Module de lampe et circuit d'éclairage associé

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JP (1) JP7430188B2 (fr)
CN (1) CN113940142A (fr)
WO (1) WO2021020538A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113071405A (zh) * 2021-03-30 2021-07-06 一汽解放汽车有限公司 日间行车灯驱动控制方法、装置、计算机设备和存储介质

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Publication number Priority date Publication date Assignee Title
US20110148306A1 (en) * 2009-12-18 2011-06-23 Ampower Technology Co., Ltd. Bypass protection circuit and light emitting diode driving device using the same
JP2015110357A (ja) * 2013-12-06 2015-06-18 株式会社小糸製作所 車両用灯具
JP2016197711A (ja) * 2015-04-06 2016-11-24 株式会社小糸製作所 駆動回路、車両用灯具

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Publication number Priority date Publication date Assignee Title
JP6872413B2 (ja) * 2017-04-28 2021-05-19 株式会社小糸製作所 車両用灯具
JP6916668B2 (ja) * 2017-05-26 2021-08-11 株式会社小糸製作所 車両用灯具および光源の点灯回路
CN108621910A (zh) * 2018-01-23 2018-10-09 常州星宇车灯股份有限公司 一种动态的日间行车灯系统
CN208046977U (zh) * 2018-04-24 2018-11-02 华域视觉科技(上海)有限公司 一种时序点亮控制电路、照明装置以及照明系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110148306A1 (en) * 2009-12-18 2011-06-23 Ampower Technology Co., Ltd. Bypass protection circuit and light emitting diode driving device using the same
JP2015110357A (ja) * 2013-12-06 2015-06-18 株式会社小糸製作所 車両用灯具
JP2016197711A (ja) * 2015-04-06 2016-11-24 株式会社小糸製作所 駆動回路、車両用灯具

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113071405A (zh) * 2021-03-30 2021-07-06 一汽解放汽车有限公司 日间行车灯驱动控制方法、装置、计算机设备和存储介质

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JPWO2021020538A1 (fr) 2021-02-04
CN113940142A (zh) 2022-01-14

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