Erdschlussdetektorschaltung, Fehlererkennungsschaltung, Lichtemittierende Vorrichtung, Fahrzeug

Details

Veröffentlichungs-Nr.

EP3244700

Aktenzeichen

EP17170438

Anmeldetag

10. Mai 2017

Veröffentlichung

1. Mai 2019

Erteilung

1. Mai 2019

Rechtsraum

EP

IPC

B60Q1/04B60Q1/34B60Q1/44G01R31/02H02H1/00H02H3/16H05B33/08

Abstract

A light emitting device includes a series connection unit constituted of N light emitting elements, a light emitting element driving circuit having an output terminal connected to an anode of the series connection unit, N short-circuit switches respectively connected in parallel to the light emitting elements, and a switch control unit arranged to control on and off of the short-circuit switches. A ground fault detection circuit, which detects a ground fault of the light emitting device, includes a reference voltage source arranged to generate a reference voltage, and a comparator arranged to compare the anode voltage of the series connection unit with the reference voltage. The reference voltage has a value smaller than the product of an on-resistance of one of the short-circuit switches and output current of the light emitting element driving circuit.

Anmelder

Firma

ROHM CO., LTD.

Land

🇯🇵 Japan

Fachgebiete