JP4923197B2 - 車両用灯具 - Google Patents
車両用灯具 Download PDFInfo
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- JP4923197B2 JP4923197B2 JP2007256886A JP2007256886A JP4923197B2 JP 4923197 B2 JP4923197 B2 JP 4923197B2 JP 2007256886 A JP2007256886 A JP 2007256886A JP 2007256886 A JP2007256886 A JP 2007256886A JP 4923197 B2 JP4923197 B2 JP 4923197B2
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- Prior art keywords
- led
- resistor
- circuit
- gnd
- disconnection
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- 238000001514 detection method Methods 0.000 claims description 31
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000010586 diagram Methods 0.000 description 11
- 230000001681 protective effect Effects 0.000 description 11
- 230000005856 abnormality Effects 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Description
VB=VA-VL1 …(2)式
またVAは、 VA=VIN-VD1-VQ7 …(3)式
VE(12V)={(3k+2k)×(16-0.7-0.2)}/(1k+3k+2k)≒9.4V …(4)式
VB(12V)=(12-0.6-0.1)-2.5=8.8V …(5)式
上記の(4)式と、(5)式を比較した場合、VE(12V)>VB(12V)となり、Q1は正常に断線検出が可能となる。
VE(16V)={(3k+2k)×(16-0.7-0.2)}/(1k+3k+2k)≒12.6V …(6)式
VB(16V)=(16-0.7-0.2)-2.7=12.4V …(7)式
但し電流が増加したために、VD1=0.7V、VQ7=0.2V、VLl=2.7Vとした。上記の(6)式と(7)式を比較したときVE(16V)<VB(16V)となり、Q1は正常に断線検出ができなくなっている。
VB(12V)=(VA-VL1)×R31/(R31+R1)=(12-0.6-0.1-2.5)×1/(1+1)=4.4V …(8)式
VB(16V)=(VA-VL1)×R31/(R31+R1)=(16-0.7-0.2-2.7)×1/(1+1)=6.2V …(9)式
2…LED
R1〜R3、R31〜R33…保護抵抗
R4…プルアップ抵抗
4…電源
4a…正端子
4b…正極配線
4c…GND端子
4d…GND配線
5…入力保護回路
6…断線検出回路
7…検出信号端子
8…断線制御回路
9…SW回路
10…消灯回路
Claims (1)
- 車両電源から電源供給を受ける複数個から成るLEDを有する光源とそのLEDを駆動する駆動回路から成る車両用灯具であり、前記車両電源側にLEDアノードを接続し、同じLEDのカソード側に複数本の抵抗を直列に接続した電流調整抵抗の一方を直列に接続し、前記電流調整抵抗の他方はGNDに接続し、前記複数本の抵抗の交点の1つにはPNPトランジスタのべースを接続し、前記トランジスタのコレクタはGNDに接続したLED検出回路を複数回路にて構成し、前記トランジスタのエミッタは電源に接続した抵抗によってプルアップし、さらに、前記車両電源に接統した抵抗と該抵抗と直列にGNDにコンデンサを接続した充電回路を有し、前記抵抗と前記コンデンサとの交点には前記LED検出回路を接続したことを特徴とする車両用灯具。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007256886A JP4923197B2 (ja) | 2007-05-30 | 2007-09-28 | 車両用灯具 |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007143707 | 2007-05-30 | ||
JP2007143707 | 2007-05-30 | ||
JP2007256886A JP4923197B2 (ja) | 2007-05-30 | 2007-09-28 | 車両用灯具 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2009006981A JP2009006981A (ja) | 2009-01-15 |
JP4923197B2 true JP4923197B2 (ja) | 2012-04-25 |
Family
ID=40322492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2007256886A Active JP4923197B2 (ja) | 2007-05-30 | 2007-09-28 | 車両用灯具 |
Country Status (1)
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JP (1) | JP4923197B2 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102470791B (zh) * | 2009-09-10 | 2014-05-21 | 三菱电机株式会社 | 前照灯用光源点亮装置及车用前照灯点亮系统 |
JP5335643B2 (ja) * | 2009-11-05 | 2013-11-06 | スタンレー電気株式会社 | 車両用灯具 |
JP6364852B2 (ja) * | 2014-03-24 | 2018-08-01 | 株式会社デンソー | 入力保護回路 |
JP6872413B2 (ja) * | 2017-04-28 | 2021-05-19 | 株式会社小糸製作所 | 車両用灯具 |
CN107054201A (zh) * | 2017-06-14 | 2017-08-18 | 广州正澳电子科技有限公司 | 一种双光led车大灯风扇的驱动电路 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3873665B2 (ja) * | 2001-06-01 | 2007-01-24 | トヨタ車体株式会社 | ターンシグナルランプ、ターンシグナルランプシステム及びターンシグナルランプ用負荷調整装置 |
JP2004009825A (ja) * | 2002-06-05 | 2004-01-15 | Koito Mfg Co Ltd | 車両用灯具装置 |
JP2004122913A (ja) * | 2002-10-01 | 2004-04-22 | Koito Mfg Co Ltd | 車両用灯具 |
JP4244154B2 (ja) * | 2003-04-16 | 2009-03-25 | 株式会社小糸製作所 | 車両用灯具 |
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2007
- 2007-09-28 JP JP2007256886A patent/JP4923197B2/ja active Active
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JP2009006981A (ja) | 2009-01-15 |
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