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:
Jun. 29, 1993
Filed:
Oct. 04, 1991
Applicant:
Inventor:
Kenneth Lipman, West Hartford, CT (US);
Assignee:
International Fuel Cells, Inc., South Windsor, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 41 ; 323207 ; 363 98 ;
Abstract
A method for defining a pulse width modulation (PWM) waveform pattern to control the switching bridges in a power inverter system to produce a low harmonic content output voltage signal includes assigning a waiting factor to each harmonic produced by the switching bridges in the power inverter system. Harmonics reduced by the power inverter system are identified and other harmonics are selected to be reduced. The selected harmonics are represented one-for-one by a corresponding set of equations and the equations are solved by each of the switch points in the PWM waveform pattern. A program for finding the switch points is also presented.