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, 2011
Filed:
Dec. 18, 2009
Yasusuke Iwashita, Yamanashi, JP;
Tadashi Okita, Yamanashi, JP;
Masakazu Niwa, Yamanashi, JP;
Kenta Yamamoto, Yamanashi, JP;
Yasusuke Iwashita, Yamanashi, JP;
Tadashi Okita, Yamanashi, JP;
Masakazu Niwa, Yamanashi, JP;
Kenta Yamamoto, Yamanashi, JP;
Fanuc Ltd, Yamanashi, JP;
Abstract
Disclosed is a PWM rectifier in which switching losses in a semiconductor device are reduced without degrading the response of a control system. In a PWM overmodulation region, the modulation scheme is set to a three-phase modulation scheme. In other regions, a switchover condition such as the amplitude of an input current is acquired and compared with a switchover level. If the switchover condition equals or exceeds the switchover level, the modulation scheme is switched over to a modified two-phase modulation scheme which reduces the number of switching operations to two thirds for the same PWM frequency.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile