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:
Jul. 11, 1989
Filed:
May. 19, 1988
Applicant:
Inventor:
Isao Kamiyama, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 41 ; 363 98 ; 363132 ;
Abstract
A PWM inverter system which eliminates a switching loss and minimizes the distortion ratio of the output voltage thereof. The PWM inverter system includes a first means for producing switching signals for 3-phase modulation by which switching elements for each phase make a switching operation, a second means for producing switching signals for 2-phase modulation by which a switching operation for one phase is unnecessary, and a change-over for changing over the two means in response, for example, to a magnitude value of the inverter output voltage.