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:
Dec. 01, 2020
Filed:
May. 09, 2017
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Shota Hanioka, Chiyoda-ku, JP;
Masahiro Iezawa, Chiyoda-ku, JP;
MITSUBISHI ELECTRIC CORPORATION, Tokyo, JP;
Abstract
A control device for controlling switching elements in a power conversion circuit includes a pattern generation unit for generating a frequency change pattern, and a controller. Using n first frequencies fc and a second frequency fdef smaller than the smallest one of differences between the n first frequencies fc, the pattern generation unit determines a shift order of the 2n switching frequencies f determined by adding/subtracting the second frequency fdef to/from the first frequencies fc, such that the middle value between two switching frequencies f before and after shifting does not overlap the value of each switching frequency f, thereby generating a frequency change pattern. The controller generates a control signal G for each switching element by using the 2n switching frequencies f for respective different duration times in accordance with the frequency change pattern.