方向指示灯制御装置、方向指示装置および方向指示装置の断線検出方法

Japanese Patent JP5295435

B1

To provide a direction indication lamp control device which may detect wire disconnection of an LED element as a direction indication lamp and may extend a lifetime of the LED element. A direction indication lamp control device includes: a pulse signal generation unit that generates a pulse signal having a predetermined period; a current control element including the other end which outputs a drive current having a magnitude corresponding to amplitude of the pulse signal, the other end of the current control element being connected to one end of an external direction indication switch, and the other end of the direction indication switch being connected to a direction indication lamp; a current clamp unit which limits the drive current to a current upper limit value by decreasing amplitude of the pulse signal, in a case where the drive current exceeds the current upper limit value; a voltage clamp unit which limits a reference voltage to a voltage upper limit value by decreasing the amplitude of the pulse signal, in a case where the reference voltage exceeds the voltage upper limit value; and a wire disconnection detection unit which outputs a wire disconnection detection signal in a case where the drive current corresponding to the pulse wave of the pulse signal is equal to or less than a wire disconnection detection value. The current upper limit value is smaller than the drive current flowing through the direction indication lamp when the reference voltage is the voltage upper limit value.

Kenichi Kubota
Hideyuki Ono

JP2012542718A

September 18, 2013

October 31, 2011

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Shindengen Industry Co., Ltd.

B60Q11/00; B60Q1/34; B60Q1/38; H05B44/00

JP2007091164A	2007-04-12
JP2005112071A	2005-04-28
JP2004168076A	2004-06-17

Hirohito Katsunuma
Yasukazu Sato
Yasushi Kawasaki
Takeshi Sekine
Akaoka Akira
Katsumi Ozawa

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