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:
Jan. 09, 2024
Filed:
Feb. 22, 2022
Hitachi Metals, Ltd., Tokyo, JP;
Yuta Sugiyama, Tokyo, JP;
Haruyasu Komano, Tokyo, JP;
PROTERIAL, LTD., Tokyo, JP;
Abstract
A surge suppression circuit is used in a rotating electrical machine system including a switching circuit composed of a plurality of switching elements and a rotating electrical machine connected thereto via an electrically conducting path comprising a plurality of electrically conductive bodies. The surge suppression circuit suppresses surge voltage generated in a plurality of connecting lines connecting the plurality of electrically conductive bodies to windings of plural phases of the rotating electrical machine. The surge suppression circuit includes a plurality of upper diodes with anodes respectively connected to the plurality of connection lines, a plurality of lower diodes with cathodes respectively connected to the plurality of connection lines, an upper line connected to respective cathodes of the plurality of upper diodes, a lower line connected to respective anodes of the plurality of lower diodes, and a voltage holding circuit connected between the upper line and the lower line. The voltage holding circuit includes a charging unit to store electric charge by the surge voltage and a discharge unit to discharge the electric charge stored in the charging unit.