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1. (WO2018198284) SEMICONDUCTOR LIGHT SOURCE LIGHTING DEVICE AND VEHICLE LAMP

Pub. No.:    WO/2018/198284    International Application No.:    PCT/JP2017/016804
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Fri Apr 28 01:59:59 CEST 2017
IPC: B60Q 11/00
H01L 33/00
H05B 37/02
H05B 37/03
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: KATO, Joji
加藤 祥治
Title: SEMICONDUCTOR LIGHT SOURCE LIGHTING DEVICE AND VEHICLE LAMP
Abstract:
When the measurement value of an output voltage measurement unit (17) drops below a first threshold value voltage, a short circuit determination unit (20) determines that there is a possibility of a short circuit failure occurring, and sends an inspection current change command to an output current control unit (19). The output current control unit (19) controls so that the output current of a step-up/step-down DC/DC converter (11) is at an inspection current lower than a drive current. The short circuit determination unit (20) then confirms that a short circuit failure is occurring when the measurement value of the output voltage measurement unit (17) drops below a second threshold value voltage.