JP7185129B2 - Vehicle lighting device - Google Patents

Vehicle lighting device Download PDF

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JP7185129B2
JP7185129B2 JP2018116722A JP2018116722A JP7185129B2 JP 7185129 B2 JP7185129 B2 JP 7185129B2 JP 2018116722 A JP2018116722 A JP 2018116722A JP 2018116722 A JP2018116722 A JP 2018116722A JP 7185129 B2 JP7185129 B2 JP 7185129B2
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led
light bulb
vehicle lighting
lighting device
pwm control
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JP2019217907A (en
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耕一 山野上
尚文 久本
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Imasen Electric Industrial Co Ltd
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Imasen Electric Industrial Co Ltd
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Priority to PCT/JP2019/022867 priority patent/WO2019244688A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • 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
    • B60Q1/44—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
    • 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
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/10—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards
    • B60Q3/16—Circuits; Control arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/28—Structurally-combined illuminating devices

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Details Of Measuring Devices (AREA)
  • Instrument Panels (AREA)
  • Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Description

本発明は、電球、ＬＥＤのいずれも点灯させ得る車両用照明装置に関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle lighting device capable of lighting both light bulbs and LEDs.

特許文献１は、車両の周囲外光の照度と周囲外光のうちの赤外線成分を検出し、照明の出力輝度を調整する照明装置を開示している。特許文献２は、所定条件下でＰＷＭ制御に切り替えて照明に電力を供給する照明回路制御装置を開示している。 Patent Literature 1 discloses a lighting device that detects the illuminance of ambient light around a vehicle and an infrared component of the ambient ambient light, and adjusts the output luminance of the illumination. Patent Literature 2 discloses a lighting circuit control device that switches to PWM control to supply power to lighting under predetermined conditions.

特開２０１４－８５２４４号公報JP 2014-85244 A 特開２０１３－１０４８２２号公報JP 2013-104822 A

電球を点灯する瞬間、突入電流により電圧が変動し、明るさが変化する（ちらつく）ことがある。また、複数の電球に共通の電源ハーネスを用いた場合、一方の電球の点灯により、他方の電球への供給電力が下がり、ちらつくことがある。 At the moment the light bulb is turned on, the voltage fluctuates due to the inrush current, and the brightness may change (flicker). Further, when a common power harness is used for a plurality of light bulbs, lighting of one light bulb may reduce the power supplied to the other light bulb, resulting in flickering.

特許文献１、特許文献２は、構成が複雑で製造コストが高いという課題がある。
ここで、ちらつきを抑えるためには、ランプ毎に電源ハーネスを準備して相互の影響を回避することも考え得るが、ランプが増えるとハーネスも増え、コストが高くなる。昇圧コンバータを付加することも考え得るが、コンバータは発振回路、コンデンサ、コイル等が必要でコストが高い。また、リニアレギュレータを追加して電圧を安定させることも考え得るが、リニアレギュレータは熱が出てエネルギー効率が低い。 Patent document 1 and patent document 2 have the problem that the configuration is complicated and the manufacturing cost is high.
Here, in order to suppress flickering, it is conceivable to prepare a power supply harness for each lamp to avoid mutual influence, but the more lamps, the more harnesses and the higher the cost. Adding a boost converter is also conceivable, but the converter requires an oscillator circuit, a capacitor, a coil, etc., and the cost is high. It is also possible to add a linear regulator to stabilize the voltage, but the linear regulator generates heat and has low energy efficiency.

更に、現在、車両は生産国において、また、仕様によって、ランプに電球が用いられたり、ＬＥＤが用いられたりすることがあり、電球、ＬＥＤのいずれにも対応可能であることが望ましい。 Furthermore, at present, depending on the country of manufacture and the specifications, vehicles may use light bulbs or LEDs for lamps, and it is desirable to be able to handle both light bulbs and LEDs.

本発明の目的は、ＬＥＤ、電球のいずれも点灯させ、電球の明るさをちらつかせない車両用照明装置を提供することである。 SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicular lighting device that lights both an LED and a light bulb and does not flicker the brightness of the light bulb.

本発明に係る車両用照明装置は電球、ＬＥＤのいずれも点灯させ得る。そして、電球への供給電圧を安定させるＰＷＭ制御回路と、当該車両用照明装置に接続されているのが電球かＬＥＤかを判断し、ＬＥＤが接続されている場合には、前記ＰＷＭ制御回路を介さずにバッテリからの電力を前記ＬＥＤに供給し、電球が接続されている場合には、前記ＰＷＭ制御回路を介してバッテリからの電力を前記電球に供給するＬＥＤ／電球判定回路と、を備え、前記ＬＥＤ／電球判定回路は、負荷電流が相対的に小さいときにＬＥＤが接続されていると判定し、負荷電流が相対的に大きいときに電球が接続されていると判定し、複数の車両用照明装置が、共通の電力線によりバッテリに接続されていることを特徴とする。 The vehicle lighting device according to the present invention can light both bulbs and LEDs. Then, a PWM control circuit that stabilizes the supply voltage to the light bulb, and determines whether the light bulb or the LED is connected to the vehicle lighting device, and if the LED is connected, the PWM control circuit an LED/light bulb determination circuit that supplies power from a battery to the LED without a light bulb, and supplies power from the battery to the light bulb through the PWM control circuit when a light bulb is connected. , the LED/light bulb determination circuit determines that the LED is connected when the load current is relatively small, determines that the light bulb is connected when the load current is relatively large, and determines that the light bulb is connected. and the lighting device for the vehicle is connected to the battery by a common power line .

本発明の車両用照明装置は、電球が接続されている場合には、ＬＥＤ／電球判定回路が、供給電圧を安定させるＰＷＭ制御回路を介してバッテリからの電力を電球に供給するため、電球のちらつきを抑えることができる。ＬＥＤが接続されている場合には、ＬＥＤ／電球判定回路が、ＰＷＭ制御回路を介さずに電力をＬＥＤに供給するため、ＰＷＭ制御回路による効率の低下を回避することができる。 In the vehicle lighting device of the present invention, when a light bulb is connected, the LED/light bulb determination circuit supplies power from the battery to the light bulb through the PWM control circuit that stabilizes the supply voltage. Flicker can be suppressed. When the LED is connected, the LED/bulb determination circuit supplies power to the LED without going through the PWM control circuit, so that the reduction in efficiency due to the PWM control circuit can be avoided.

本発明の実施形態に係る車両用照明装置の構成を示す説明図BRIEF DESCRIPTION OF THE DRAWINGS An explanatory diagram showing the configuration of a vehicle lighting device according to an embodiment of the present invention. 実施形態の車両用照明装置によるＰＷＭ制御の波形図Waveform diagram of PWM control by the vehicle lighting device of the embodiment 実施形態の車両用照明装置の回路図1 is a circuit diagram of a vehicle lighting device according to an embodiment;

図１は、本発明の実施形態に係る車両用照明装置の構成を示す説明図である。
バッテリＢａｔｔからの電力が共通の電源ハーネス１２を介して２台の車両用照明装置１０Ａ、１０Ｂに供給されている。車両用照明装置１０Ａには電球１４Ａが接続されている。車両用照明装置１０Ｂには電球１４Ｂが接続されている。 FIG. 1 is an explanatory diagram showing the configuration of a vehicle lighting device according to an embodiment of the present invention.
Electric power from the battery Batt is supplied to the two vehicle lighting devices 10A and 10B via a common power supply harness 12 . A light bulb 14A is connected to the vehicle lighting device 10A. A light bulb 14B is connected to the vehicle lighting device 10B.

図２は、実施形態の車両用照明装置１０Ａ、１０ＢによるＰＷＭ制御の波形図である。
車両用照明装置１０Ａ、１０Ｂは、出力をＰＷＭ駆動し、バッテリからの電圧が高いときオン－ｄｕｔｙを小さくし、電圧が低いときオン－ｄｕｔｙを大きくし、電圧を平均値が一定になるように調整することで、それぞれ、電球１４Ａ、電球１４Ｂの明るさが一定になるようにする。即ち、電球を点灯する瞬間、突入電流による電圧変動を抑制し、明るさが変化することを防ぐ。また、複数の電球１４Ａ、１４Ｂに共通の電源ハーネス１２が用いられ、例えば一方の電球１４Ａの点灯により、電源ハーネス１２の抵抗分による電圧降下によって、他方の電球１４Ｂ側への供給電力が下がる。車両用照明装置１０ＢによるＰＷＭ制御で、電圧を平均値が一定になるように調整することで、電球１４Ｂの明るさが一定になるようにする。実施形態では、２個の車両用照明装置１０Ａ、１０Ｂに共通の電源ハーネス１２を用いるため、ハーネスの数を削減し、コストを低下させることができる。また、ハーネスを太くすることで、抵抗損失を低減することができる。この例では、２個の車両用照明装置１０Ａ、１０Ｂで、共通の電源ハーネス１２を用いたが、３個以上の車両用照明装置で、共通の電源ハーネスを用いることも勿論可能である。 FIG. 2 is a waveform diagram of PWM control by the vehicle lighting devices 10A and 10B of the embodiment.
The vehicle lighting devices 10A and 10B drive the output by PWM, reduce the on-duty when the voltage from the battery is high, increase the on-duty when the voltage is low, and adjust the voltage so that the average value is constant. By adjusting, the brightness of the light bulbs 14A and 14B is made constant. That is, at the moment the light bulb is turned on, the voltage fluctuation due to the rush current is suppressed to prevent the brightness from changing. A common power supply harness 12 is used for a plurality of light bulbs 14A and 14B. For example, when one light bulb 14A is lit, a voltage drop due to the resistance of the power supply harness 12 reduces the power supplied to the other light bulb 14B. The brightness of the light bulb 14B is kept constant by adjusting the voltage so that the average value is kept constant by the PWM control by the vehicle lighting device 10B. In the embodiment, since the common power supply harness 12 is used for the two vehicle lighting devices 10A and 10B, the number of harnesses can be reduced and the cost can be lowered. Moreover, resistance loss can be reduced by thickening the harness. In this example, the two vehicle lighting devices 10A and 10B use a common power harness 12, but it is of course possible to use a common power harness for three or more vehicle lighting devices.

図３は、実施形態の車両用照明装置の回路図である。
車両用照明装置１０は、輝度安定用のＰＷＭ制御回路２０と、ＭＯＳＦＥＴと、ＬＥＤ／電球の判定用電流リミッタ３０とを備える。ＰＷＭ制御回路２０は、第１トランジスタＱ１とオペアンプＵ１とを備える。判定用電流リミッタ３０は、第２トランジスタＱ２と第３トランジスタＱ３とを備える。 FIG. 3 is a circuit diagram of the vehicle lighting device of the embodiment.
The vehicle lighting device 10 includes a PWM control circuit 20 for brightness stabilization, a MOSFET, and a current limiter 30 for LED/bulb determination. The PWM control circuit 20 includes a first transistor Q1 and an operational amplifier U1. The determination current limiter 30 includes a second transistor Q2 and a third transistor Q3.

ＰＷＭ制御回路２０の第１トランジスタＱ１のエミッタはアース側に接続され、コレクタは抵抗Ｒ１１を介してＭＯＳＦＥＴのゲート側に接続されている。ベースは、抵抗Ｒ１０を介して、オペアンプＵ１の出力に接続されている。オペアンプＵ１の正電源はバッテリＶ４に接続され、負電源はアースに接続されている。オペアンプＵ１の非反転入力は、抵抗Ｒ８を介して５．４Ｖの基準電圧Ｖ３に接続されると共に、抵抗Ｒ４を介してアースに接続されている。オペアンプＵ１の反転入力には、抵抗Ｒ７、抵抗Ｒ９を介して判定用電流リミッタ３０の第３トランジスタＱ３のコレクタに接続され、第２トランジスタＱ２のベースに接続されている。更に、オペアンプＵ１の反転入力には抵抗Ｒ３、抵抗Ｒ２、ダイオードＤ１を介して、ＭＯＳＦＥＴのソース、負荷（ＬＥＤ／電球）Ｒ１に接続されている。抵抗Ｒ３と抵抗Ｒ２との間には、アースに落とされ、時定数を形成する抵抗Ｒ６とコンデンサＣ１の並列回路が接続されている。抵抗Ｒ９と抵抗Ｒ７の間には、車両用照明装置による電球／ＬＥＤのオン、オフを制御する制御入力Ｃｏｎｔに接続される。制御入力Ｃｏｎｔがローレベルにされることで、電球／ＬＥＤがオンになる。 The emitter of the first transistor Q1 of the PWM control circuit 20 is connected to the ground side, and the collector is connected to the gate side of the MOSFET through the resistor R11. The base is connected to the output of op amp U1 through resistor R10. Op amp U1 has its positive supply connected to battery V4 and its negative supply connected to ground. The non-inverting input of op amp U1 is connected to a 5.4V reference voltage V3 through resistor R8 and to ground through resistor R4. The inverting input of the operational amplifier U1 is connected to the collector of the third transistor Q3 of the judgment current limiter 30 through the resistors R7 and R9, and to the base of the second transistor Q2. Further, the inverting input of the operational amplifier U1 is connected to the source of the MOSFET and the load (LED/light bulb) R1 through resistors R3, R2 and a diode D1. Between the resistors R3 and R2 is connected a parallel circuit of a resistor R6 and a capacitor C1 which are grounded and which form a time constant. A control input Cont is connected between the resistor R9 and the resistor R7 to control the on/off of the bulb/LED by the vehicle lighting system. The light bulb/LED is turned on by setting the control input Cont to a low level.

判定用電流リミッタ３０の第３トランジスタＱ３のエミッタは、定電圧電源回路Ｖ１に接続されている。定電圧電源回路Ｖ１は、バッテリＶ４の電圧よりもわずかに低い１１．８Ｖの定電圧を発生させている。第３トランジスタＱ３のベースは、抵抗Ｒ１３を介して定電圧電源回路Ｖ１に接続されると共に、第２トランジスタＱ２のエミッタに接続されている。第２トランジスタＱ２のベースは、上述したように第３トランジスタＱ３のコレクタに接続されている。第２トランジスタＱ２のコレクタは、負荷Ｒ１側に接続されている。 The emitter of the third transistor Q3 of the judgment current limiter 30 is connected to the constant voltage power supply circuit V1. The constant-voltage power supply circuit V1 generates a constant voltage of 11.8V slightly lower than the voltage of the battery V4. The base of the third transistor Q3 is connected to the constant-voltage power supply circuit V1 through the resistor R13, and is also connected to the emitter of the second transistor Q2. The base of the second transistor Q2 is connected to the collector of the third transistor Q3 as described above. The collector of the second transistor Q2 is connected to the load R1 side.

ＭＯＳＦＥＴのドレーンはバッテリＶ４に接続されている。上述したように、ＭＯＳＦＥＴのゲートは、ＰＷＭ制御回路２０の第１トランジスタＱ１のコレクタに抵抗Ｒ１１を介して接続されると共に、バッテリＶ４からの電圧が抵抗Ｒ１２を介してバイアスされる。ＭＯＳＦＥＴのソースは、負荷Ｒ１側に接続されている。 The drain of the MOSFET is connected to battery V4. As mentioned above, the gate of the MOSFET is connected to the collector of the first transistor Q1 of the PWM control circuit 20 through resistor R11 and is biased by the voltage from battery V4 through resistor R12. The source of the MOSFET is connected to the load R1 side.

次ぎに、車両用照明装置１０の回路動作について、先ず、負荷としてＬＥＤが接続された場合から説明する。
車両用照明装置１０にＬＥＤが接続された場合、負荷（ＬＥＤ）Ｒ１に流れる電流が相対的に小さいため、判定用電流リミッタ３０の第３トランジスタＱ３がオフとなり、第２トランジスタＱ２がオンとなり、定電圧電源回路Ｖ１の電圧が、抵抗Ｒ１３、第２トランジスタＱ２を介して負荷（ＬＥＤ）Ｒ１に加えられる。即ち、判定用電流リミッタ３０が負荷がＬＥＤであると判定した際には、ＰＷＭ制御回路２０を介することなく、定電圧電源回路Ｖ１の電圧が負荷（ＬＥＤ）Ｒ１に加えられる。このため、ＰＷＭ制御回路２０、及び、ＭＯＳＦＥＴでの電力消費が回避される。 Next, the circuit operation of the vehicle lighting device 10 will be described from the case where an LED is connected as a load.
When LEDs are connected to the vehicle lighting device 10, the current flowing through the load (LED) R1 is relatively small, so the third transistor Q3 of the judgment current limiter 30 is turned off, the second transistor Q2 is turned on, and The voltage of the constant voltage power supply circuit V1 is applied to the load (LED) R1 through the resistor R13 and the second transistor Q2. That is, when the determination current limiter 30 determines that the load is the LED, the voltage of the constant voltage power supply circuit V1 is applied to the load (LED) R1 without going through the PWM control circuit 20. FIG. Therefore, power consumption in the PWM control circuit 20 and the MOSFET is avoided.

車両用照明装置１０に電球が接続された場合、負荷（電球）Ｒ１に流れる電流が相対的に大きいため、判定用電流リミッタ３０の第３トランジスタＱ３がオンとなり、第２トランジスタＱ２がオフとなり、ＰＷＭ制御回路２０によりＰＷＭ制御されたＭＯＳＦＥＴからのバッテリＶ４の電圧が負荷（電球）Ｒ１に加えられる。オペアンプＵ１の反転入力に加えられた負荷（電球）Ｒ１側に印加されている電圧と、非反転入力に加えられた基準電圧Ｖ３との比較で、オペアンプＵ１の出力が切り替わり、第１トランジスタＱ１を介してＭＯＳＦＥＴをオン、オフする。即ち、負荷（ＬＥＤ）Ｒ１に印加されている電圧が高いときオン－ｄｕｔｙを小さくし、電圧が低いときオン－ｄｕｔｙを大きくし、電圧を平均値が一定になるように調整することで、負荷（電球）Ｒ１の明るさを一定に保つ。 When a light bulb is connected to the vehicle lighting device 10, the current flowing through the load (light bulb) R1 is relatively large. The voltage of battery V4 from a MOSFET PWM-controlled by PWM control circuit 20 is applied to load (light bulb) R1. By comparing the voltage applied to the load (light bulb) R1 side applied to the inverting input of the operational amplifier U1 with the reference voltage V3 applied to the non-inverting input, the output of the operational amplifier U1 is switched to switch the first transistor Q1. MOSFET is turned on and off via That is, when the voltage applied to the load (LED) R1 is high, the on-duty is decreased, and when the voltage is low, the on-duty is increased, and by adjusting the voltage so that the average value is constant, the load (Bulb) Keep brightness of R1 constant.

実施形態の車両用照明装置１０は、電球が接続されている場合には、判定用電流リミッタ３０が、供給電圧を安定させるＰＷＭ制御回路２０を介してバッテリＶ４からの電力を電球に供給するため、電球のちらつきを抑えることができる。ＬＥＤが接続されている場合には、判定用電流リミッタ３０が、ＰＷＭ制御回路２０、ＭＯＳＦＥＴを介さずに電力をＬＥＤに供給するため、ＰＷＭ制御回路、ＭＯＳＦＥＴによる効率の低下を回避することができる。 In the vehicle lighting device 10 of the embodiment, when a light bulb is connected, the determination current limiter 30 supplies electric power from the battery V4 to the light bulb through the PWM control circuit 20 that stabilizes the supply voltage. , can suppress the flickering of the light bulb. When the LED is connected, the judgment current limiter 30 supplies power to the LED without passing through the PWM control circuit 20 and the MOSFET, so it is possible to avoid a decrease in efficiency due to the PWM control circuit and the MOSFET. .

判定用電流リミッタ３０は、定電圧電源回路Ｖ１を介してバッテリからの電力が供給されるため、バッテリの電圧変動があっても動作が安定している。判定用電流リミッタ３０は、消費電流の相対的に小さなＬＥＤが接続されている場合には、定電圧電源回路Ｖ１からの電圧をＬＥＤに供給するため、ＬＥＤの明るさを一定に保つことができる。判定用電流リミッタ３０は、消費電流の相対的に大きな電球が接続されている場合には、ＰＷＭ制御回路２０を介してバッテリＶ４からの電力を電球に供給する。これにより明るさを一定に保つことができる。 Since the determination current limiter 30 is supplied with power from the battery via the constant voltage power supply circuit V1, its operation is stable even if the voltage of the battery fluctuates. When an LED with a relatively small current consumption is connected, the judgment current limiter 30 supplies a voltage from the constant voltage power supply circuit V1 to the LED, so that the brightness of the LED can be kept constant. . The current limiter 30 for determination supplies power from the battery V4 to the light bulb through the PWM control circuit 20 when a light bulb that consumes a relatively large current is connected. This makes it possible to keep the brightness constant.

実施形態の車両用照明装置１０はメータ照明を点灯させる。これにより、メータ照明のちらつきを防ぎ、運転者の疲労を軽減することができる。また、実施形態車両用照明装置は車幅灯を点灯させる。これにより、車幅灯のちらつきを防ぐことができる。また、実施形態の車両用照明装置はブレーキランプを点灯させる。これにより、ブレーキランプのちらつきを防ぐことができる。 The vehicle lighting device 10 of the embodiment turns on the meter lighting. As a result, flickering of the meter lighting can be prevented, and driver fatigue can be reduced. Further, the vehicle illumination device of the embodiment turns on the side lights. As a result, flickering of the side lights can be prevented. Further, the vehicle lighting device of the embodiment lights the brake lamp. This can prevent flickering of the brake lamp.

実施形態の車両用照明装置はＰＷＭ制御を用いて電球への供給電圧を安定化させる。このため、発振回路、コンデンサ、コイル等の必要な昇圧コンバータを用いるよりも廉価に構成することができる。更に、リニアレギュレータを用いるのと比較し、熱が出にくいのでエネルギー効率が高い。 The vehicle lighting device of the embodiment uses PWM control to stabilize the voltage supplied to the light bulb. Therefore, it can be configured at a lower cost than using a necessary boost converter such as an oscillation circuit, a capacitor, and a coil. Furthermore, compared to using a linear regulator, less heat is generated, so energy efficiency is high.

なお、実施形態の車両用照明装置１０は前照灯には用いられないことが望ましい。前照灯は消費電流が大きいため、ＰＷＭ制御では効率を高めることが難しいからである。また、実施形態の車両用照明装置１０はウインカーランプ等の点滅するランプには用いる優位性が低い。 In addition, it is desirable that the vehicle lighting device 10 of the embodiment is not used as a headlamp. This is because headlamps consume a large amount of current, and it is difficult to improve efficiency with PWM control. In addition, the vehicle lighting device 10 of the embodiment has a low advantage when used for flashing lamps such as winker lamps.

１０、１０Ａ、１０Ｂ 車両用照明装置
１２ 電源ハーネス
１４Ａ、１４Ｂ 電球
２０ ＰＷＭ制御回路
３０ 判定用電流リミッタ（ＬＥＤ／電球判定回路） Reference Signs List 10, 10A, 10B Vehicle lighting device 12 Power supply harness 14A, 14B Light bulb 20 PWM control circuit 30 Judgment current limiter (LED/bulb judgment circuit)

Claims (4)

電球、ＬＥＤのいずれも点灯させ得る車両用照明装置であって、
電球への供給電圧を安定させるＰＷＭ制御回路と、
当該車両用照明装置に接続されているのが電球かＬＥＤかを判断し、ＬＥＤが接続されている場合には、前記ＰＷＭ制御回路を介さずにバッテリからの電力を前記ＬＥＤに供給し、電球が接続されている場合には、前記ＰＷＭ制御回路を介してバッテリからの電力を前記電球に供給するＬＥＤ／電球判定回路と、を備え、
前記ＬＥＤ／電球判定回路は、負荷電流が相対的に小さいときにＬＥＤが接続されていると判定し、負荷電流が相対的に大きいときに電球が接続されていると判定し、
複数の車両用照明装置が、共通の電力線によりバッテリに接続されている。 A vehicle lighting device capable of lighting both light bulbs and LEDs,
a PWM control circuit that stabilizes the supply voltage to the light bulb;
It is determined whether the light bulb or the LED is connected to the vehicle lighting device, and if the LED is connected, the PWM control circuit is not passed.from batteryan LED/light bulb determination circuit that supplies power to the LED and, if a light bulb is connected, supplies power from a battery to the light bulb through the PWM control circuit.,
The LED/light bulb determination circuit determines that the LED is connected when the load current is relatively small, determines that the light bulb is connected when the load current is relatively large,
A plurality of vehicle lighting devices are connected to the battery by a common power line. 請求項１の車両用照明装置であって、
前記ＬＥＤ／電球判定回路は、定電圧電源回路を介してバッテリからの電力が供給され、
前記ＬＥＤ／電球判定回路は、ＬＥＤが接続されている場合には、前記定電圧電源回路からの電圧を前記ＬＥＤに供給し、
前記ＬＥＤ／電球判定回路は、電球が接続されている場合には、前記ＰＷＭ制御回路を介してバッテリからの電力を前記電球に供給する。 The vehicle lighting device according to claim 1,
The LED/bulb determination circuit is supplied with power from a battery via a constant voltage power supply circuit,
The LED/light bulb determination circuit supplies a voltage from the constant voltage power supply circuit to the LED when the LED is connected,
The LED/light bulb determination circuit supplies power from the battery to the light bulb through the PWM control circuit when the light bulb is connected. 請求項１又は請求項２の車両用照明装置であって、
前記車両用照明装置は車幅灯を点灯させる。 The vehicle lighting device according to claim 1 or claim 2 ,
The vehicle illumination device turns on the side lights. 請求項１又は請求項２の車両用照明装置であって、
前記車両用照明装置はブレーキランプを点灯させる。 The vehicle lighting device according to claim 1 or claim 2 ,
The vehicle lighting device turns on the brake lamp.
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JP2003178893A (en) 2001-12-07 2003-06-27 Yazaki Corp Power supply equipment for vehicle
JP2005231429A (en) 2004-02-18 2005-09-02 Koito Mfg Co Ltd Lamp for vehicle
JP2007196957A (en) 2006-01-30 2007-08-09 Mazda Motor Corp Rear part opening/closing structure for automobile
JP2015020460A (en) 2013-07-16 2015-02-02 日本精機株式会社 Control device of on-vehicle illumination lamp
JP2017136895A (en) 2016-02-01 2017-08-10 新電元工業株式会社 On-vehicle lighting lamp control device

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Publication number Priority date Publication date Assignee Title
JP2003178893A (en) 2001-12-07 2003-06-27 Yazaki Corp Power supply equipment for vehicle
JP2005231429A (en) 2004-02-18 2005-09-02 Koito Mfg Co Ltd Lamp for vehicle
JP2007196957A (en) 2006-01-30 2007-08-09 Mazda Motor Corp Rear part opening/closing structure for automobile
JP2015020460A (en) 2013-07-16 2015-02-02 日本精機株式会社 Control device of on-vehicle illumination lamp
JP2017136895A (en) 2016-02-01 2017-08-10 新電元工業株式会社 On-vehicle lighting lamp control device

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