Title:
INDUCTIVE LOAD DRIVE CIRCUIT
Document Type and Number:
Japanese Patent JP2018007090
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an inductive load drive circuit capable of protecting a semiconductor switch in a case where a circuit ground and a ground are disconnected, the inductive load drive circuit being configured to protect the semiconductor switch in the case of battery reverse connection.SOLUTION: An inductive load drive circuit 10 comprises a protection circuit 13 which is connected between an output terminal S of a semiconductor switch element 12 and a ground line Lg and protects the semiconductor switch element 12. The protection circuit 13 includes: a protection switch Q1 which is connected in series to a reflux diode D1 and turned off in the case of reverse connection of a battery Ba to block a flow of a current from the battery through the reflux diode D1 to the semiconductor switch element 12; and a cutoff circuit 14 which turns off the protection switch Q1 in response to disconnection in the case where the ground line Lg and a ground Eth are disconnected.SELECTED DRAWING: Figure 1
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Inventors:
NODA SHINJI
HIGUCHI YUTAKA
KOTO MASAHIKO
HIGUCHI YUTAKA
KOTO MASAHIKO
Application Number:
JP2016133091A
Publication Date:
January 11, 2018
Filing Date:
July 05, 2016
Export Citation:
Assignee:
SUMITOMO WIRING SYSTEMS
International Classes:
H03K17/08; G05F1/10; H02H11/00; H03K17/695
Attorney, Agent or Firm:
Akatsuki Joint Patent Office
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