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1. (WO2018105294) LIGHT-EMITTING DEVICE, FIBER LASER, AND, GROUND FAULT DETERMINATION METHOD

Pub. No.:    WO/2018/105294    International Application No.:    PCT/JP2017/040281
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Thu Nov 09 00:59:59 CET 2017
IPC: H05B 37/02
G01R 31/02
H02H 3/16
H02H 7/00
H02H 11/00
Applicants: FUJIKURA LTD.
株式会社フジクラ
Inventors: KAMEYAMA, Takashi
亀山 喬史
Title: LIGHT-EMITTING DEVICE, FIBER LASER, AND, GROUND FAULT DETERMINATION METHOD
Abstract:
Provided is a light-emitting device capable of determining, in an unlit state, whether or not a ground fault has occurred, the determination not requiring the use of a shunt resistance. This light-emitting device (1) comprises: a current path (11) including a plurality of laser diodes (LD1 to LD6) and a power source (PS) provided upstream therefrom; and an LD control unit (13) determining whether or not a ground fault has occurred on the basis of an end-to-end voltage (VPQ) from a section containing the laser diode (LD1).