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:
Mar. 25, 2025
Filed:
Sep. 30, 2021
Hitachi Astemo, Ltd., Hitachinaka, JP;
Takeshi Ikuyama, Hitachinaka, JP;
Koichi Yahata, Hitachinaka, JP;
Shinichirou Hida, Hitachinaka, JP;
Yawara Kato, Hitachinaka, JP;
HITACHI ASTEMO, LTD., Hitachinaka, JP;
Abstract
There are provided a plurality of drive circuits (U,L) for driving respective plural switching devices constituting upper arms and lower arms, a power supply circuit for supplying a power supply to the plurality of drive circuits, and a discharge circuit for discharging a capacitor. The power supply circuit includes a first transformer (U) for the upper arms, and a second transformer (L) for the lower arms, which include a primary winding connected in parallel to a DC power supply. The first transformer and the second transformer include a secondary winding for supplying a power supply to the drive circuits and for supplying a power supply to a low-voltage circuit (). Each of the first transformer and the second transformer includes a feedback winding for outputting the voltage output to the drive circuits, to a power supply control IC. The discharge circuit () is driven by a power supply supplied from the feedback winding.