The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 2020
Filed:
Jan. 10, 2017
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki, JP;
Satoshi Hiranuma, Hitachinaka, JP;
Koichi Yahata, Hitachinaka, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Hitachinaka, JP;
Abstract
Circuit configurations become complicate as a power circuit is expanded, and switching elements are necessarily controlled using invert circuits even when an inverter operates normally. A drive circuitmonitors soundness of a gate power circuit. When a voltage value Pis less than a predetermined threshold, the drive circuit determines that a failure occurs in the gate power circuit, and outputs a signal Pto a controller. After receiving the signal P, the controlleroutputs a signal to a signal line Sto operate a photovoltaic coupler of a power supply circuit. Then, the MOS transistor Tin the battery circuitenters a conduction state. The charges accumulated in the capacitor Care immediately accumulated to the gate electrode of the switching elementto turn on the switching element. In addition, the charges discharged from the capacitor Care charged from the photovoltaic coupler.