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:
Oct. 13, 1992
Filed:
Oct. 30, 1990
Applicant:
Inventors:
Takafumi Maruyama, Amagasaki, JP;
Masayoshi Kumano, Amagasaki, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 98 ; 363 41 ; 363 43 ; 363132 ; 318811 ;
Abstract
In a method of controlling the output voltage of a three-phase three-level inverter having a plurality of switching elements by pulse width modulation in each of three-pulse and one-pulse modes, the upper limit of the percentage modulation is set to a value equal to or smaller than the maximum percentage modulation determined by the minimum switching element off time to output a three-level voltage as an inverter output voltage in each phase if each of the switching element is turned of and off one time during one inverter output period.