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:
Sep. 13, 2022
Filed:
Dec. 26, 2018
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
HITACHI ASTEMO, LTD., Hitachinaka, JP;
Abstract
An object of the present invention is to improve availability when a power is lost. In a power conversion device, a gate drive power supply circuitcan supply a gate drive power within a predetermined normal voltage range. A backup power supply circuitsupplies the gate drive power to a lower arm gate circuitwhen a voltage of the gate drive power applied from the gate drive power supply circuitto the lower arm gate circuitfalls below a normal voltage range. When the gate drive power is supplied from the backup power supply circuit, the lower arm gate circuitdrives a lower arm switching circuitin a short state in which all switching elements of the lower arm switching circuitare turned on.