Title:
地絡検出回路、異常検出回路、発光装置、車両
Document Type and Number:
Japanese Patent JP6723064
Kind Code:
B2
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.
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Inventors:
Yoshiyuki Nakatani
High Shinsuke Kimoto
High Shinsuke Kimoto
Application Number:
JP2016094818A
Publication Date:
July 15, 2020
Filing Date:
May 10, 2016
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
B60Q1/04; G01R31/50; B60Q1/34; H05B44/00; B60Q1/44; H05B47/00
Domestic Patent References:
| JP2015153657A | ||||
| JP2014170880A |
Foreign References:
| US20130313973 | ||||
| US20160121783 |
Attorney, Agent or Firm:
Sano patent office