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1. (WO2015118768) LOAD-DRIVING CIRCUIT

Pub. No.:    WO/2015/118768    International Application No.:    PCT/JP2014/082357
Publication Date: Fri Aug 14 01:59:59 CEST 2015 International Filing Date: Tue Dec 09 00:59:59 CET 2014
IPC: H03K 17/08
H03K 17/00
H03K 17/687
Applicants: HITACHI AUTOMOTIVE SYSTEMS, LTD.
日立オートモティブシステムズ株式会社
Inventors: SONEHARA Masahito
曽根原 理仁
KOBAYASHI Youichirou
小林 洋一郎
Title: LOAD-DRIVING CIRCUIT
Abstract:
A load-driving circuit for receiving a supply of power from a power source and driving a load, wherein the load-driving circuit is provided with: a high-side switching element; a low-side switching element; a high-side current detection circuit connected in parallel to the high-side switching element, the high-side current detection circuit detecting a high-side driving current; and a fault detection circuit for detecting the fault state of the load-driving circuit from the output result of the high-side current detection circuit. The high-side current detection circuit is provided with a high-side sense switching circuit operating in response to a gate signal that is different from the high-side switching element, the high-side sense switching circuit comprising a device of the same type as the high-side switching element. The output result of the high-side current detection circuit, the gate signal of the high-side switching element, and the gate signal of the high-side sense switching element are input and the fault states are detected apart from each other when the connection terminal between the load-driving circuit and the load is in a state of short circuit with the positive electrode side of the power source or in a state of short circuit with the negative electrode side of the power source.