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:
Feb. 03, 2004
Filed:
May. 24, 2001
Makoto Tanikawa, Tokyo, JP;
Takahiro Ishigami, Tokyo, JP;
Yoshihiko Kikkawa, Tokyo, JP;
Hitoshi Tanifuji, Tokyo, JP;
Yoshihiro Iwasaki, Tokyo, JP;
Hiroaki Suzuki, Tokyo, JP;
Isao Kawasaki, Tokyo, JP;
Ichiro Minejima, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided are, a converter section ( ) which converts a commercial AC voltage (V ) into a DC voltage (V ); an inverter section ( ) which converts the DC voltage (V ) into an output AC voltage (V ) of a predetermined frequency by a pulse-width modulation system based on an assigned PWM width, and supplies the output AC voltage (V ) to a compressor motor ( ). Further, an instantaneous DC voltage detecting section ( ) detects an instantaneous DC voltage (V ); and an arithmetic processing section ( ) corrects the PWM width so as to maintain the output AC voltage (V ) at a desired value following the variation in the instantaneous DC voltage (V ). It is possible to operate a compressor motor ( ) in an optimum state of load characteristics and efficiency.