WO2021020538A1 - Lamp module and lighting circuit therefor - Google Patents

Lamp module and lighting circuit therefor Download PDF

Info

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
Authority
WO
WIPO (PCT)
Prior art keywords
light emitting
current
lighting
current amount
lighting mode
Prior art date
Application number
PCT/JP2020/029348
Other languages
French (fr)
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/en
Priority to JP2021535445A priority patent/JP7430188B2/en
Publication of WO2021020538A1 publication Critical patent/WO2021020538A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—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

Landscapes

  • 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

A drive circuit (210) stabilizes the time-average of a drive current (ILED) flowing in a light-emitting string (110) to a first current amount (IREF1) when in a first lighting mode and stabilizes the time-average of the drive current (ILED) to a second current amount (IREF2) which is smaller than the first current amount (IREF1) when in a second lighting mode. The drive circuit (210), on detection of an abnormal state in which no current flows in the light-emitting string (110) while in the second lighting mode, changes the on and off states of each of a plurality of bypass switches (SW1 and SW2) to search for a state in which a current flows in the light-emitting string (110) and secures that state. Next, the drive circuit stabilizes the time-average of the drive current (ILED) flowing in the light-emitting string (110) to a third current amount (IREF3) which is larger than the second current amount (IREF2).

Description

灯具モジュールおよびその点灯回路Lighting module and its lighting circuit
　本発明は、自動車などに用いられる灯具モジュールに関する。 The present invention relates to a lamp module used in an automobile or the like.
　自動車には、ハイビーム、ロービーム、クリアランスランプ（ポジションランプ）やデイタイムランニングランプ（ＤＲＬ：Daytime Running Lamp）、ストップランプ、テイルランプなど、さまざまなランプが搭載される。 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.
特開２０１０－２４１３４７号公報JP-A-2010-241347
　本発明はかかる状況においてなされたものであり、そのある態様の例示的な目的のひとつは、２つのランプの機能を切り替え可能な灯具モジュールあるいは点灯回路の提供にある。 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.
　本発明のある態様は、第１点灯モードと第２点灯モードが切り替え可能な灯具に使用され、複数の発光素子を含む発光ストリングを駆動する点灯回路に関する。点灯回路は、（i）第１点灯モードにおいて、発光ストリングに流れる駆動電流の時間平均を第１電流量に安定化し、（ii）第２点灯モードにおいて、駆動電流の時間平均を第１電流量より小さい第２電流量に安定化する駆動回路と、複数のバイパススイッチを備える。複数のバイパススイッチはそれぞれ、複数の発光素子のうち、対応する少なくともひとつと並列に接続されている。駆動回路は、第２点灯モードにおいて、発光ストリングに電流が流れない異常状態を検出すると、複数のバイパススイッチそれぞれのオン、オフ状態を変化させて、発光ストリングに電流が流れる回復状態を探索し、複数のバイパススイッチを回復状態にセットし、発光ストリングに流れる駆動電流の時間平均を第２電流量より大きい第３電流量に安定化する。 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. In the lighting circuit, (i) 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. 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.
　この態様によると、発光ストリングが断線故障した場合でも、断線箇所をバイパスすることにより、発光ストリングが点灯できなくなるのを防止できる。また断線箇所をバイパスすると、点灯可能な発光素子の個数が減少して光量が低下するところ、個数の減少を補うように、発光ストリングに流れる駆動電流の時間平均を正常状態に比べて増加させることにより、光量の低下を抑制することができる。 According to this aspect, even if 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. When bypassing the disconnection point, the number of light emitting elements that can be lit decreases and the amount of light decreases. To compensate for the decrease in the number of light emitting elements, 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.
　発光ストリングはＮ個の発光素子を含んでもよい。回復状態において電流が流れる発光素子の個数がＫ個であるとき、第３電流量は、第２電流量のＮ／Ｋ倍であってもよい。これにより異常状態における光量を、正常状態の光量と等しくできる。 The light emitting string may include N light emitting elements. When the number of light emitting elements through which current flows in the recovery state is K, the third current amount may be N / K times the second current amount. As a result, the amount of light in the abnormal state can be made equal to the amount of light in the normal state.
　発光ストリングは、それぞれが同数の発光素子を含むＭ個の群に分割され、複数のバイパススイッチは、Ｍ個のバイパススイッチを含んでもよい。第３電流量は、第２電流量のＭ／（Ｍ－１）倍であってもよい。これにより異常状態における光量を、正常状態の光量と等しくできる。 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. As a result, the amount of light in the abnormal state can be made equal to the amount of light in the normal state.
　発光ストリングは４個の発光素子を含み、Ｍ＝２であってもよい。 The light emitting string includes four light emitting elements and may have M = 2.
　第１点灯モードはストップランプであり、第２点灯モードはテイルランプであってもよい。 The first lighting mode may be a stop lamp, and the second lighting mode may be a tail lamp.
　第１点灯モードはデイタイムランニングランプであり、第２点灯モードはクリアランスランプであってもよい。 The first lighting mode may be a daytime running lamp, and the second lighting mode may be a clearance lamp.
　本発明の別の態様は、灯具モジュールに関する。灯具モジュールは、複数の発光素子を含む発光ストリングと、発光ストリングを駆動する上述のいずれかの点灯回路と、を備える。 Another aspect of the present invention relates to a lamp module. 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.
　なお、以上の構成要素の任意の組み合わせや本発明の構成要素や表現を、方法、装置、システムなどの間で相互に置換したものもまた、本発明の態様として有効である。 It should be noted that any combination of the above components or the components and expressions of the present invention that are mutually replaced between methods, devices, systems, etc. are also effective as aspects of the present invention.
　本発明のある態様によれば、２つのランプの機能を切り替え可能な灯具モジュールあるいは点灯回路を提供できる。 According to an aspect of the present invention, it is possible to provide a lamp module or a lighting circuit capable of switching the functions of two lamps.
実施の形態に係る灯具モジュールを備える灯具システムのブロック図である。It is a block diagram of the lamp system including the lamp module according to the embodiment. 図１の灯具モジュールの動作を説明するタイムチャートである。It is a time chart explaining the operation of the lamp module of FIG. 駆動回路の構成例を示すブロック図である。It is a block diagram which shows the structural example of a drive circuit. 図４（ａ）、（ｂ）は、駆動回路の構成例を示す回路図である。4 (a) and 4 (b) are circuit diagrams showing a configuration example of a drive circuit. 変形例１に係る灯具モジュールの回路図である。It is a circuit diagram of the lamp module which concerns on the modification 1.
　以下、本発明を好適な実施の形態をもとに図面を参照しながら説明する。各図面に示される同一または同等の構成要素、部材、処理には、同一の符号を付するものとし、適宜重複した説明は省略する。また、実施の形態は、発明を限定するものではなく例示であって、実施の形態に記述されるすべての特徴やその組み合わせは、必ずしも発明の本質的なものであるとは限らない。 Hereinafter, the present invention will be described based on a preferred embodiment with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings shall be designated by the same reference numerals, and redundant description will be omitted as appropriate. Further, the embodiment is not limited to the invention but is an example, and all the features and combinations thereof described in the embodiment are not necessarily essential to the invention.
　本明細書において、「部材Ａが、部材Ｂと接続された状態」とは、部材Ａと部材Ｂが物理的に直接的に接続される場合のほか、部材Ａと部材Ｂが、それらの電気的な接続状態に実質的な影響を及ぼさない、あるいはそれらの結合により奏される機能や効果を損なわせない、その他の部材を介して間接的に接続される場合も含む。 In the present specification, 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.
　同様に、「部材Ｃが、部材Ａと部材Ｂの間に設けられた状態」とは、部材Ａと部材Ｃ、あるいは部材Ｂと部材Ｃが直接的に接続される場合のほか、それらの電気的な接続状態に実質的な影響を及ぼさない、あるいはそれらの結合により奏される機能や効果を損なわせない、その他の部材を介して間接的に接続される場合も含む。 Similarly, "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.
　また本明細書において、電圧信号、電流信号などの電気信号、あるいは抵抗、キャパシタなどの回路素子に付された符号は、必要に応じてそれぞれの電圧値、電流値、あるいは抵抗値、容量値を表すものとする。 Further, in the present specification, 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.
　図１は、実施の形態に係る灯具モジュール１００を備える灯具システム１のブロック図である。灯具システム１は、バッテリ２、スイッチ４、車両側ＥＣＵ（Electronic Control Unit）６および灯具１０を備える。 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.
　車両用灯具１０は、ハイビーム１２、ロービーム１４および灯具モジュール１００を備える。灯具モジュール１００は、車両用灯具１０の複数の機能のうち、第１機能と第２機能を受け持っており、第１機能と第２機能が切替可能である。本実施の形態では、車両用灯具１０は前照灯（ヘッドランプ）であり、第１機能はデイタイムランニングランプ（ＤＲＬと表記する）であり、第２機能はクリアランスランプ（ＣＬＲと表記する）である。 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. In the present embodiment, the vehicle lamp 10 is a headlight (headlamp), the first function is a daytime running lamp (denoted as DRL), and the second function is a clearance lamp (denoted as CLR). Is.
　灯具モジュール１００は、発光ストリング１１０および点灯回路２００を備え、それらがユニット化されたものであり、灯具モジュール１００の完成品が、車両用灯具１０に組み付けられる。 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.
　発光ストリング１１０は、直列に接続される複数Ｎ個（Ｎ≧２）の発光素子１１２を含む。発光素子１１２はたとえばＬＥＤ（発光ダイオード）であるが、ＬＤ（レーザダイオード）、有機ＥＬ（Electro Luminescence）素子などの別の半導体発光素子であってもよい。本実施の形態では、発光ストリング１１０は直列に接続されるＮ＝４個の発光素子１１２＿１～１１２＿４を含む。なお発光素子１１２の個数Ｎは、３であってもよいし、４より大きくてもよい。 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. In the present embodiment, the light emitting string 110 includes N = 4 light emitting elements 112_1 to 112_4 connected in series. The number N of the light emitting elements 112 may be 3 or larger than 4.
　点灯回路２００には、スイッチ４を介してバッテリ２からの電圧（バッテリ電圧）ＶＢＡＴが電源として供給される。また車両側ＥＣＵ６から、デイタイムランニングランプの点灯指示ＤＲＬ、もしくはクリアランスランプの点灯指示ＣＬＲが入力される。 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.
　点灯回路２００は、ＤＲＬの点灯指示を受けると、第１点灯モードで動作し、発光ストリング１１０を第１の光量で発光させ、ＤＲＬの点灯指示を受けると、第２点灯モードで動作し、発光ストリング１１０を第１の光量より小さい第２の光量で発光させる。 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.
　点灯回路２００は、駆動回路２１０および複数のバイパススイッチＳＷ１，ＳＷ２を含む。 The lighting circuit 200 includes a drive circuit 210 and a plurality of bypass switches SW1 and SW2.
　駆動回路２１０は、（i）第１点灯モードにおいて、発光ストリング１１０に流れる駆動電流ＩＬＥＤの時間平均を第１電流量ＩＲＥＦ１に安定化し、（ii）第２点灯モードにおいて、駆動電流ＩＬＥＤの時間平均を第１電流量ＩＲＥＦ１より小さい第２電流量ＩＲＥＦ２に安定化する。駆動回路２１０は、ＤＣ調光によって駆動電流ＩＬＥＤの時間平均を制御してもよいし、ＰＷＭ（Pulse Width Modulation）調光によって駆動電流ＩＬＥＤの時間平均を制御してもよいし、それらの組み合わせによって駆動電流ＩＬＥＤの時間平均を制御してもよい。 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.
　複数のバイパススイッチＳＷ１，ＳＷ２は、複数の発光素子１１２＿１～１１２＿４を、それぞれが少なくともひとつの発光素子を含む複数の群に分割したときの、複数の群に対応する。この例では、発光ストリング１１０は、それぞれが同数の発光素子１１２を含むＭ個の群に分割されており、Ｍ＝２であり、したがって２個のバイパススイッチＳＷ１，ＳＷ２が設けられる。バイパススイッチＳＷ１は、第１群である発光素子１１２＿１，１１２＿２のペアと並列に接続され、バイパススイッチＳＷ２は、第２群である発光素子１１２＿３，１１２＿４のペアと並列に接続される。 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. In this example, the light emitting strings 110 are each divided into M groups including the same number of light emitting elements 112, and M = 2, so that two bypass switches SW1 and SW2 are provided. 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.
　本実施の形態において複数のバイパススイッチＳＷ１，ＳＷ２は、正常状態においてオフに固定され、したがって発光ストリング１１０に流れる駆動電流ＩＬＥＤは、駆動回路２１０の出力電流ＩＯＵＴに等しい。 In the present embodiment, 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.
　駆動回路２１０は、発光ストリング１１０に駆動電流ＩＬＥＤが流れない異常状態を検出可能に構成される。駆動回路２１０は、第２点灯モードにおいてこの異常状態を検出すると、複数のバイパススイッチＳＷ１，ＳＷ２それぞれのオン、オフ状態を変化させて、発光ストリング１１０に駆動電流ＩＬＥＤが流れる回復探索し、回復状態として記憶する。そして第２点灯モードの点灯指示が持続する間、複数のバイパススイッチＳＷ１，ＳＷ２を回復状態にセットし、発光ストリング１１０に流れる駆動電流ＩＬＥＤの時間平均を第２電流量ＩＲＥＦ２より大きい第３電流量ＩＲＥＦ３に安定化する。これを異常点灯モードと称する。 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. When 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. Remember as a state. Then, while the lighting instruction of the second lighting mode continues, 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.
　第３電流量ＩＲＥＦ３は、異常点灯モードにおいて、クリアランスランプとしての光量が維持できるように定められる。したがって第３電流量ＩＲＥＦ３は、第２電流量ＩＲＥＦ２のα＝Ｍ／（Ｍ－１）倍とすることが好ましい。この実施の形態ではＭ＝２であるから、α＝２であり、ＩＲＥＦ３＝２×ＩＲＥＦ２となる。駆動回路２１０がＤＣ調光に対応している場合、出力電流ＩＯＵＴの直流の電流量を２倍に増加させればよく、駆動回路２１０がＰＷＭ調光に対応している場合、出力電流ＩＯＵＴのデューティ比を２倍に増加させればよい。 The third current amount I REF3 is determined so that the amount of light as a clearance lamp can be maintained in the abnormal lighting mode. Therefore, the third current amount I REF3 is preferably α = M / (M-1) times the second current amount I REF2 . In this embodiment, since M = 2, α = 2, and I REF3 = 2 × I REF2 . When the drive circuit 210 is compatible with DC dimming, 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.
　以上が灯具モジュール１００の構成である。続いてその動作を説明する。図２は、図１の灯具モジュール１００の動作を説明するタイムチャートである。 The above is the configuration of the lamp module 100. Next, the operation will be described. FIG. 2 is a time chart illustrating the operation of the lamp module 100 of FIG.
　時刻ｔ１に、ＤＲＬの点灯指示が与えられると、駆動回路２１０は第１点灯モードで動作する。駆動回路２１０は、時間平均が第１電流量ＩＲＥＦ１に安定化された出力電流ＩＯＵＴを生成し、発光ストリング１１０に駆動電流ＩＬＥＤとして供給する。 At time t 1, the lighting instruction for DRL is given, 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 .
　時刻ｔ２に、ＣＬＲの点灯指示が与えられると、駆動回路２１０は第２点灯モードに移行する。駆動回路２１０は、時間平均が第２電流量ＩＲＥＦ２に安定化された出力電流ＩＯＵＴを生成し、発光ストリング１１０に駆動電流ＩＬＥＤとして供給する。 To time t 2, the the lighting instruction CLR is given, 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 .
　時刻ｔ３に発光ストリング１１０において断線故障が発生したとする。この例では、発光素子１１２＿３と１１２＿４の間が断線したとする。発光ストリング１１０が断線すると、駆動回路２１０の出力電流ＩＯＵＴが流れなくなり、時刻ｔ４に駆動回路２１０がこれを異常状態として検出する。 Disconnection failure in the light-emitting strings 110 to have occurred at time t 3. In this example, it is assumed that the wire between the light emitting elements 112_3 and 112_4 is broken. When the light-emitting string 110 is disconnected, 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.
　続いて、駆動回路２１０は、複数のバイパススイッチＳＷ１，ＳＷ２のオン、オフの組み合わせを変化させる。たとえば、駆動回路２１０は、複数のバイパススイッチＳＷ１～ＳＷ２をひとつずつ、順にオンとし、電流の遮断が解除される回復状態を探索する。具体的には、時刻ｔ５にバイパススイッチＳＷ１をオンとする。このとき、出力電流ＩＯＵＴは遮断されたままであるから、異常検出状態が維持される。 Subsequently, 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.
　続く時刻ｔ６に、バイパススイッチＳＷ２がオンとされる。バイパススイッチＳＷ２がオンとなると、断線箇所がバイパスされ、駆動電流ＩＬＥＤが、発光素子１１２＿１，１１２＿２およびバイパススイッチＳＷ２を含む経路に流れるようになり、電流の遮断が解除される。即ちＳＷ１がオフ、ＳＷ２がオンの状態が回復状態である。 At the time t 6 that follows, the bypass switch SW2 is turned on. When 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.
　時刻ｔ７に異常検出が解除されると、駆動回路２１０は、このときのスイッチＳＷ１，ＳＷ２の状態（回復状態）を保存し、時刻ｔ７以降、スイッチＳＷ１，ＳＷ２の状態を固定する。また駆動回路２１０は、駆動回路２１０の出力電流ＩＯＵＴを、第３電流量ＩＲＥＦ３に増加させ、異常点灯モードに移行する。これにより、発光ストリング１１０のうち、発光素子１１２＿１および１１２＿２が、第３電流量ＩＲＥＦ３の駆動電流ＩＬＥＤによって駆動される。 Abnormality when the detection is canceled at time t 7, 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 .
　以上が灯具モジュール１００の動作である。続いて灯具モジュール１００の利点を説明する。 The above is the operation of the lamp module 100. Next, the advantages of the lamp module 100 will be described.
　この灯具モジュール１００によれば、デイタイムランニングタイムとクリアランスランプの機能を有する灯具をモジュール化することができる。これにより、デイタイムランニングタイムとクリアランスランプが別々にユニット化されている場合に比べて車両用灯具１０の組み立てを簡素化できる。 According to this lamp module 100, a lamp having a daytime running time and a clearance lamp function can be modularized. As a result, 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.
　また、２つの機能のランプにおいて、単一の発光ストリング１１０を兼用することとし、単一の駆動回路２１０によって駆動することにより、部品点数およびコストを削減でき、また灯具モジュール１００のサイズを小型化できる。 Further, in the lamp having two functions, 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.
　さらにこの灯具モジュール１００によれば、発光ストリング１１０が断線故障した場合でも、断線箇所を探索し、断線箇所をバイパスすることにより、発光ストリング１１０が点灯できなくなるのを防止できる。 Further, according to 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.
　また断線箇所をバイパスすると、点灯可能な発光素子１１２の個数が減少して光量が低下するところ、個数の減少を補うように、発光ストリング１１０に流れる駆動電流ＩＬＥＤの時間平均を正常状態に比べて増加させることにより、光量の低下を抑制することができる。図２の例では、正常状態において４個の発光素子１１２＿１～１１２＿４が点灯可能であり、異常状態では、２個の発光素子１１２＿１，１１２＿２が点灯可能であるが、駆動電流を２倍に増やすことで、異常状態における光量を、正常状態における光量と等しくすることができる。 Further, when the disconnection point is bypassed, 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. By increasing the amount of light, it is possible to suppress a decrease in the amount of light. In the example of FIG. 2, 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.
　このようにして灯具モジュール１００によれば、発光ストリング１１０が断線した場合でも、少なくともクリアランスランプとしての機能は温存することができる。 In this way, according to the lamp module 100, even if the light emitting string 110 is disconnected, at least the function as a clearance lamp can be preserved.
　なお、デイタイムランニングランプにおいて断線故障が検出された場合は、光量が不足するため、駆動回路２１０を停止する。 If a disconnection failure is detected in the daytime running lamp, the drive circuit 210 is stopped because the amount of light is insufficient.
　本発明は、図１のブロック図や回路図として把握され、あるいは上述の説明から導かれるさまざまな装置、方法に及ぶものであり、特定の構成に限定されるものではない。以下、本発明の範囲を狭めるためではなく、発明の本質や動作の理解を助け、またそれらを明確化するために、より具体的な構成例や実施例を説明する。 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. Hereinafter, 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.
　図３は、駆動回路２１０の構成例を示すブロック図である。駆動回路２１０は、定電流ドライバ２１２、異常検出回路２１４、コントローラ２１６を含む。 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.
　定電流ドライバ２１２は、定電流出力のリニアレギュレータであってもよいし、定電流出力のスイッチングコンバータ（ＤＣ／ＤＣコンバータ）であってもよいし、定電圧出力のスイッチングコンバータと定電流回路の組み合わせであってもよい。定電流ドライバ２１２は、出力電流ＩＯＵＴの時間平均を、コントローラ２１６によって指示された電流量ＩＲＥＦに安定化する。 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.
　異常検出回路２１４は、発光ストリング１１０に駆動電流ＩＬＥＤが流れない断線故障を検出する。たとえば異常検出回路２１４は、定電流ドライバ２１２の出力電流ＩＯＵＴを監視し、出力電流ＩＯＵＴが所定のしきい値を下回ると、異常状態と判定する。 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.
　コントローラ２１６は定電流ドライバ２１２に対して、正常状態において、第１点灯モードでは第１電流量ＩＲＥＦ１を指示し、第２点灯モードでは第２電流量ＩＲＥＦ２を指示する。 In the normal state, 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.
　コントローラ２１６は、異常検出回路２１４によって異常が検出されると、複数のバイパススイッチＳＷ１，ＳＷ２のオン、オフ状態の組み合わせを変化させ、断線箇所を特定し、断線箇所と並列なバイパススイッチをオン、それ以外をオフに固定する。また第２点灯モードでは、定電流ドライバ２１２に対して、第３電流量ＩＲＥＦ３を指示する。 When an abnormality is detected by the abnormality detection circuit 214, 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 .
　なお図３の駆動回路２１０の構成は例示に過ぎず、当業者によればその構成にはさまざまな変形例が存在すること、またそうした変形例も本発明の範囲に含まれることが理解される。 It should be noted that the configuration of the drive circuit 210 in FIG. 3 is merely an example, and it is understood by those skilled in the art that there are various variations in the configuration, and that such modifications are also included in the scope of the present invention. ..
　図４（ａ）、（ｂ）は、駆動回路２１０の構成例を示す回路図である。図４（ａ）の駆動回路２１０は、降圧コンバータ２３０と、コンバータコントローラ２３２を備える。降圧コンバータ２３０は、スイッチングトランジスタＭ１、整流素子Ｄ１、インダクタＬ１、キャパシタＣ１、センス抵抗Ｒｓを含む。センス抵抗Ｒｓは、駆動電流ＩＯＵＴの経路上に設けられる。コンバータコントローラ２３２は、センス抵抗Ｒｓの電圧降下Ｖｓ（Ｖｓ＝ＩＯＵＴ×Ｒｓ）が所定の目標電圧ＶＲＥＦに近づくように、スイッチングトランジスタＭ１を制御する。これにより、出力ＩＯＵＴは、ＩＲＥＦ＝ＶＲＥＦ／Ｒｓに近づくように安定化される。 4 (a) and 4 (b) are circuit diagrams showing a configuration example of the drive circuit 210. 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 . The converter controller 232 controls the switching transistor M1 so that the voltage drop Vs (Vs = I OUT × Rs) of the sense resistor Rs approaches a predetermined target voltage V REF . As a result, the output I OUT is stabilized so as to approach I REF = V REF / Rs.
　整流素子Ｄ１としてトランジスタを用いた同期整流型を採用してもよい。また直列に接続される発光素子１２２の個数Ｍが多い場合には、昇圧コンバータを用いることができる。 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.
　図４（ｂ）に示すように、駆動回路２１０をリニアレギュレータで構成してもよい。リニアレギュレータは、図４（ｂ）に示すような電流ソース型であってもよいし、図示しない電流シンク型であってもよい。 As shown in FIG. 4B, 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).
　以上、本発明について、実施の形態をもとに説明した。この実施の形態は例示であり、それらの各構成要素や各処理プロセスの組み合わせにいろいろな変形例が可能なこと、またそうした変形例も本発明の範囲にあることは当業者に理解されるところである。以下、こうした変形例について説明する。 The present invention has been described above based on the embodiments. This embodiment is an example, and it will be understood by those skilled in the art that various modifications are possible for each of these components and combinations of each processing process, and that such modifications are also within the scope of the present invention. is there. Hereinafter, such a modification will be described.
（変形例１）
　図５は、変形例１に係る灯具モジュール１００Ａの回路図である。この変形例１において、発光ストリング１１０は、それぞれが１個の発光素子を含む４個の群に分割され、点灯回路２００Ａは４個のバイパススイッチＳＷ１～ＳＷ４を含む。つまりＭ＝４である。 (Modification example 1)
FIG. 5 is a circuit diagram of the lamp module 100A according to the first modification. In the first modification, the light emitting string 110 is divided into four groups each including one light emitting element, and the lighting circuit 200A includes four bypass switches SW1 to SW4. That is, M = 4.
　駆動回路２１０Ａのコントローラ２１６は、断線故障が検出されると、バイパススイッチＳＷ１～ＳＷ４のオン、オフ状態を切り替えて、断線箇所を特定する。この場合、第３電流量ＩＲＥＦ３は、第２電流量ＩＲＥＦ２のα＝４／３倍となる。 When the disconnection failure is detected, the controller 216 of the drive circuit 210A switches the bypass switches SW1 to SW4 on and off to identify the disconnection location. In this case, the third current amount I REF3 is α = 4/3 times the second current amount I REF2 .
（変形例２）
　コントローラ２１６は、複数のバイパススイッチを１個ずつ順にオンしても、電流遮断が解除されない場合、バイパススイッチのペアの組み合わせを切り替えながら、オン状態としてもよい。そして、あるバイパススイッチのペアをオンした状態で電流遮断が解除された場合には、第３電流量ＩＲＥＦ３を、第２電流量ＩＲＥＦ２のα＝Ｍ／（Ｍ－２）倍に設定すればよい。これにより、二箇所で断線している場合にも、クリアランスランプの機能を維持することができる。 (Modification 2)
If the current cutoff is not released even if the plurality of bypass switches are turned on one by one, the controller 216 may be turned on while switching the combination of bypass switch pairs. Then, when the current cutoff is released with a certain bypass switch pair turned on, the third current amount I REF3 is set to α = M / (M-2) times the second current amount I REF2. Just do it. As a result, the function of the clearance lamp can be maintained even when the wire is broken at two points.
　同時にオン可能なバイパススイッチは、１個または２個に限定されず、３個以上として、３箇所以上の断線故障に対応できるようにしてもよい。一般化すると、Ｍ個の発光素子１１２を含む発光ストリング１１０に関して、電流遮断が解除された状態において駆動電流が流れている発光素子の個数をＫとするとき、第３電流量ＩＲＥＦ３は、第２電流量ＩＲＥＦ２のα＝Ｎ／Ｋ倍とすればよい。 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. Generally speaking, with respect to the light emitting string 110 including M light emitting elements 112, when the number of light emitting elements in which the drive current is flowing in the state where the current cutoff is released is K, the third current amount I REF3 is the third. 2 The amount of current I REF2 may be α = N / K times.
（変形例３）
　第１点灯モードの間に、断線故障が発生した場合にも、同様の処理を行うことができる。すなわち、第１点灯モード中に断線故障を検知すると、バイパススイッチのオン、オフを変化させて断線箇所がバイパスされる回復状態を探索する。そして複数のバイパススイッチを回復状態に固定して、駆動電流ＩＬＥＤの時間平均を第３電流量ＩＲＥＦ３にセットする。これにより、ＤＲＬでの点灯指示が与えられた場合に、ＤＲＬではなく、クリアランスランプとして点灯することができる。なお、断線箇所の探索期間の間、駆動回路２１０の出力電流ＩＯＵＴを、第１電流量ＩＲＥＦ１から第２電流量ＩＲＥＦ２に変更してもよい。 (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 .
（変形例４）
　断線故障が生じた場合に、クリアランスランプの機能に加えて、デイタイムランニングランプの機能を維持してもよい。具体的には、デイタイムランニングランプの点灯中、すなわち第１点灯モードにおいて、異常状態を検出した際には、断線箇所を探索し、断線箇所をそれと並列なバイパススイッチによって短絡し、駆動電流の時間平均を、第１電流量より大きい第４電流量に増加すればよい。Ｍ個の発光素子１１２を含む発光ストリング１１０に関して、電流遮断が解除された状態において駆動電流が流れている発光素子の個数をＫとするとき、第４電流量ＩＲＥＦ４は、第１電流量ＩＲＥＦ１のＮ／Ｋ倍とすればよい。 (Modification example 4)
In the event of a disconnection failure, 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. Regarding 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 .
（変形例５）
　実施の形態では、駆動回路２１０の出力電流ＩＯＵＴの時間平均を変化させることにより、各モードにおける駆動電流ＩＬＥＤの時間平均を変化させたがその限りでない。変形例５では、駆動回路２１０の出力電流ＩＯＵＴを点灯モードにかかわらず一定として、バイパススイッチＳＷを利用したＰＷＭ調光によって、各点灯モードにおける駆動電流ＩＬＥＤの時間平均を制御してもよい。 (Modification 5)
In the embodiment, 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. In the fifth modification, 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. ..
　図１を参照する。バイパススイッチＳＷ＃のオンデューティ比と、それと並列な発光素子１１２＿＃の点灯デューティ比は相補的な関係にある。たとえばバイパススイッチＳＷ＃のオンデューティ比がｄ％であるとき、発光素子１１２＿＃の点灯デューティ比は（１００－ｄ）％となる。 Refer to FIG. 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)%.
　たとえば、第１点灯モードでは、すべてのバイパススイッチＳＷがオフに固定される（オンデューティ比ｄ＝０％）。このとき発光ストリング１１０の点灯デューティ比は１００％であるから、駆動電流ＩＬＥＤの時間平均（第１電流量）ＩＲＥＦ１は、
　ＩＲＥＦ１＝ＩＯＵＴ
となる。 For example, in the first lighting mode, all bypass switch SWs are fixed to off (on-duty ratio d = 0%). At this time, since the lighting duty ratio of the light emitting string 110 is 100%, the time average (first current amount) I REF1 of the drive current I LED is
I REF1 = I OUT
Will be.
　第１電流量ＩＲＥＦ１と第２電流量ＩＲＥＦ２の間に、
　ＩＲＥＦ２＝β×ＩＲＥＦ１
の関係が成立しているとする。ただし０＜β＜１である。 Between the first current amount I REF1 and the second current amount I REF2 ,
I REF2 = β × I REF1
It is assumed that the relationship of is established. However, 0 <β <1.
　このとき第２点灯モードでは、すべてのバイパススイッチＳＷが、（１－β）×１００％のデューティ比でスイッチングされる。このときの発光ストリング１１０の点灯デューティ比は（β×１００）％であるから、駆動電流ＩＬＥＤの時間平均（第２電流量）ＩＲＥＦ２は、
　ＩＲＥＦ２＝β×ＩＯＵＴ
となる。ＩＲＥＦ１＝ＩＯＵＴであるから、ＩＲＥＦ２＝ＩＲＥＦ１×βとなる。 At this time, in the second lighting mode, all the bypass switch SWs are switched at a duty ratio of (1-β) × 100%. Since the lighting duty ratio of the light emitting string 110 at this time is (β × 100)%, the time average (second current amount) I REF2 of the drive current I LED is
I REF2 = β × I OUT
Will be. Since I REF1 = I OUT , I REF2 = I REF1 × β.
　第３電流量ＩＲＥＦ３と第２電流量ＩＲＥＦ２の間に、
　ＩＲＥＦ３＝α×ＩＲＥＦ２
の関係が成立しているとする。ただし１＜αである。 Between the third current amount I REF3 and the second current amount I REF2 ,
I REF3 = α × I REF2
It is assumed that the relationship of is established. However, 1 <α.
　このとき異常点灯モードにおいて、すべてのバイパススイッチＳＷを、（１－α×β）×１００％のデューティ比でスイッチングされる。このときの発光ストリング１１０の点灯デューティ比は（α×β×１００）％であるから、駆動電流ＩＬＥＤの時間平均（第３電流量）ＩＲＥＦ３は、
　ＩＲＥＦ３＝α×β×ＩＯＵＴ
となる。つまりＩＲＥＦ３＝ＩＲＥＦ２×αとなる。 At this time, in the abnormal lighting mode, all the bypass switch SWs are switched at a duty ratio of (1-α × β) × 100%. Since the lighting duty ratio of the light emitting string 110 at this time is (α × β × 100)%, the time average (third current amount) I REF3 of the drive current I LED is
I REF3 = α × β × I OUT
Will be. That is, I REF3 = I REF2 × α.
（変形例６）
　第１点灯モードをＤＲＬ、第２点灯モードをクリアランスランプに対応付けたがその限りでなく、第１点灯モードをストップランプ、第２点灯モードをテイルランプに対応付けてもよい。 (Modification 6)
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.
　実施の形態にもとづき、具体的な語句を用いて本発明を説明したが、実施の形態は、本発明の原理、応用を示しているにすぎず、実施の形態には、請求の範囲に規定された本発明の思想を逸脱しない範囲において、多くの変形例や配置の変更が認められる。 Although the present invention has been described using specific terms and phrases based on the embodiments, the embodiments merely indicate the principles and applications of the present invention, and the embodiments are defined in the claims. Many modifications and arrangement changes are permitted without departing from the ideas of the present invention.
　本発明は、自動車などに用いられる灯具モジュールに関する。 The present invention relates to a lamp module used in an automobile or the like.
　１　灯具システム
　２　バッテリ
　４　スイッチ
　６　車両側ＥＣＵ
　１０　車両用灯具
　１２　ハイビーム
　１４　ロービーム
　１００　灯具モジュール
　１１０　発光ストリング
　１１２　発光素子
　２００　点灯回路
　ＳＷ１，ＳＷ２　バイパススイッチ
　２１０　駆動回路
　２１２　定電流ドライバ
　２１４　異常検出回路
　２１６　コントローラ 1 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

Claims (7)

  1. 　第１点灯モードと第２点灯モードが切り替え可能な灯具に使用され、複数の発光素子を含む発光ストリングを駆動する点灯回路であって、
    　（i）第１点灯モードにおいて、前記発光ストリングに流れる駆動電流の時間平均を第１電流量に安定化し、（ii）前記第２点灯モードにおいて、前記駆動電流の時間平均を前記第１電流量より小さい第２電流量に安定化する駆動回路と、
    　複数のバイパススイッチであって、それぞれが、前記複数の発光素子のうち、対応する少なくともひとつと並列に接続されている、複数のバイパススイッチと、
    　を備え、
    　前記駆動回路は、前記第２点灯モードにおいて、前記発光ストリングに電流が流れない異常状態を検出すると、前記複数のバイパススイッチそれぞれのオン、オフ状態を変化させて、前記発光ストリングに電流が流れる回復状態を探索し、前記複数のバイパススイッチを回復状態にセットし、前記発光ストリングに流れる駆動電流の時間平均を前記第２電流量より大きい第３電流量に安定化することを特徴とする点灯回路。     A lighting circuit used for a lamp whose first lighting mode and second lighting mode can be switched, and which drives a light emitting string including a plurality of light emitting elements.
    (I) 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. A drive circuit that stabilizes to a smaller second current amount,
    A plurality of bypass switches, each of which is connected in parallel with at least one of the plurality of light emitting elements.
    With
    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 recover the current flowing through the light emitting string. A lighting circuit characterized by searching for a state, setting the plurality of bypass switches to a recovery state, and stabilizing the time average of the drive current flowing through the light emitting string to a third current amount larger than the second current amount. ..
  2. 　前記発光ストリングはＮ個の発光素子を含み、
    　前記回復状態において電流が流れる発光素子の個数がＫ個であるとき、前記第３電流量は、前記第２電流量のＮ／Ｋ倍であることを特徴とする請求項１に記載の点灯回路。     The light emitting string includes N light emitting elements.
    The lighting circuit according to claim 1, wherein when the number of light emitting elements through which current flows in the recovery state is K, the third current amount is N / K times the second current amount. ..
  3. 　前記発光ストリングは、それぞれが同数の発光素子を含むＭ個の群に分割され、
    　前記複数のバイパススイッチは、Ｍ個のバイパススイッチを含み、
    　前記第３電流量は、前記第２電流量のＭ／（Ｍ－１）倍であることを特徴とする請求項１または２に記載の点灯回路。     The light emitting string is divided into M groups, each containing the same number of light emitting elements.
    The plurality of bypass switches include M bypass switches.
    The lighting circuit according to claim 1 or 2, wherein the third current amount is M / (M-1) times the second current amount.
  4. 　前記発光ストリングは４個の発光素子を含み、Ｍ＝２であることを特徴とする請求項３に記載の点灯回路。 The lighting circuit according to claim 3, wherein the light emitting string includes four light emitting elements and M = 2.
  5. 　前記第１点灯モードはストップランプであり、
    　前記第２点灯モードはテイルランプであることを特徴とする請求項１から４のいずれかに記載の点灯回路。     The first lighting mode is a stop lamp.
    The lighting circuit according to any one of claims 1 to 4, wherein the second lighting mode is a tail lamp.
  6. 　前記第１点灯モードはデイタイムランニングランプであり、
    　前記第２点灯モードはクリアランスランプであることを特徴とする請求項１から４のいずれかに記載の点灯回路。     The first lighting mode is a daytime running lamp.
    The lighting circuit according to any one of claims 1 to 4, wherein the second lighting mode is a clearance lamp.
  7. 　複数の発光素子を含む発光ストリングと、
    　前記発光ストリングを駆動する請求項１から６のいずれかに記載の点灯回路と、
    　を備えることを特徴とする灯具モジュール。     A light emitting string containing multiple light emitting elements and
    The lighting circuit according to any one of claims 1 to 6 for driving the light emitting string.
    A lamp module characterized by being equipped with.
PCT/JP2020/029348 2019-08-01 2020-07-30 Lamp module and lighting circuit therefor WO2021020538A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080040768.5A CN113940142A (en) 2019-08-01 2020-07-30 Lamp module and lighting circuit thereof
JP2021535445A JP7430188B2 (en) 2019-08-01 2020-07-30 Lighting module and its lighting circuit

Applications Claiming Priority (2)

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

Publications (1)

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

Family

ID=74229699

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/029348 WO2021020538A1 (en) 2019-08-01 2020-07-30 Lamp module and lighting circuit therefor

Country Status (3)

Country Link
JP (1) JP7430188B2 (en)
CN (1) CN113940142A (en)
WO (1) WO2021020538A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113071405A (en) * 2021-03-30 2021-07-06 一汽解放汽车有限公司 Daytime running lamp drive control method and device, computer equipment and storage medium

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 (en) * 2013-12-06 2015-06-18 株式会社小糸製作所 Vehicular lighting fixture
JP2016197711A (en) * 2015-04-06 2016-11-24 株式会社小糸製作所 Drive circuit and vehicle lighting device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6872413B2 (en) * 2017-04-28 2021-05-19 株式会社小糸製作所 Vehicle lighting
JP6916668B2 (en) * 2017-05-26 2021-08-11 株式会社小糸製作所 Lighting circuit for vehicle lighting equipment and light source
CN108621910A (en) * 2018-01-23 2018-10-09 常州星宇车灯股份有限公司 A kind of dynamic daytime running lamps system
CN208046977U (en) * 2018-04-24 2018-11-02 华域视觉科技(上海)有限公司 A kind of sequential starting controlling circuit, lighting device and lighting system

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 (en) * 2013-12-06 2015-06-18 株式会社小糸製作所 Vehicular lighting fixture
JP2016197711A (en) * 2015-04-06 2016-11-24 株式会社小糸製作所 Drive circuit and vehicle lighting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113071405A (en) * 2021-03-30 2021-07-06 一汽解放汽车有限公司 Daytime running lamp drive control method and device, computer equipment and storage medium

Also Published As

Publication number Publication date
CN113940142A (en) 2022-01-14
JP7430188B2 (en) 2024-02-09
JPWO2021020538A1 (en) 2021-02-04

Similar Documents

Publication Publication Date Title
US10327290B2 (en) Lighting circuit and vehicle lamp
EP3285550B1 (en) Automotive led driving apparatus
US9992835B2 (en) Lighting circuit
US9162607B2 (en) Vehicular lamp
US20100141162A1 (en) Led driver circuit with sequential led lighting control
US10375783B2 (en) Lighting circuit and vehicular lamp
JP6757579B2 (en) Light emitting element drive device, light emitting device, vehicle
EP2457768B1 (en) Power converter and vehicle lighting device, vehicle headlight and vehicle using power converter
JP7183018B2 (en) Lighting circuit and vehicle lamp
JP6302706B2 (en) VEHICLE LIGHT AND DRIVE DEVICE THEREOF
JP6821835B2 (en) Lighting circuit and vehicle lighting equipment using it
JP5749244B2 (en) LED lamp lighting device and control method
KR20180128840A (en) Lighting circuit and vehicle lamp
JP2008126958A (en) Variable load type lighting circuit
JP2013099072A (en) Power supply device and led driving device
WO2021020538A1 (en) Lamp module and lighting circuit therefor
CN112566817A (en) Lighting circuit and vehicle lamp
CN114207348A (en) Light source module
WO2020032269A1 (en) Lighting circuit and vehicular lamp
WO2021010325A1 (en) Lighting circuit and vehicular lamp
JP2009280157A (en) Vehicular headlamp device
JP5897768B2 (en) LED driver circuit and method for controlling LED driver circuit
EP2642825A1 (en) Lighting circuit and luminaire
JP7408448B2 (en) Light source module and lighting circuit
WO2021241451A1 (en) Vehicle lighting system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20848137

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021535445

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20848137

Country of ref document: EP

Kind code of ref document: A1