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Title:
LOAD DRIVE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2019/111734
Kind Code:
A1
Abstract:
Provided is a load drive circuit. The load drive circuit comprises: a power supply terminal that connects a power supply; a load terminal that connects a load to which a supply voltage from the power supply connected to the power supply terminal is to be supplied; a semiconductor switch that is connected between the power supply terminal and the load terminal; a control circuit that comprises an output terminal which outputs a control signal for controlling the opening and closing of the semiconductor switch; a flyback circuit that comprises a flyback diode that is connected to the semiconductor switch, and a protection switch that, when the power supply is reversely connected, is turned off to block the flow of current from the power supply to the semiconductor switch through the flyback diode; a first terminal that connects the control circuit to a first fixed potential; a second terminal that connects an anode of the flyback diode to a second fixed potential through the protection switch; and a connection circuit that comprises a connection switch which is interposed in a conduction path connecting the output terminal and the first terminal, and that connects the output terminal and the first terminal by turning on the connection switch when a rise in the potential difference between the first terminal and the second terminal is detected.

Inventors:
NOUDA, Shinji (1-14, Nishisuehirocho, Yokkaichi-sh, Mie 03, 〒5108503, JP)
HIGUCHI, Yutaka (1-14, Nishisuehirocho, Yokkaichi-sh, Mie 03, 〒5108503, JP)
Application Number:
JP2018/043245
Publication Date:
June 13, 2019
Filing Date:
November 22, 2018
Export Citation:
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Assignee:
SUMITOMO WIRING SYSTEMS, LTD. (1-14, Nishisuehirocho Yokkaichi-sh, Mie 03, 〒5108503, JP)
International Classes:
H03K17/08; H02H11/00; H03K17/0812; H03K17/695
Foreign References:
JPH11308780A1999-11-05
JP2008276727A2008-11-13
JPH0883909A1996-03-26
JP2017028417A2017-02-02
US20160241013A12016-08-18
Attorney, Agent or Firm:
KOHNO, Hideto et al. (KOHNO & KOHNO, 4-3 Tsuriganecho 2-chome, Chuo-ku, Osaka-sh, Osaka 35, 〒5400035, JP)
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