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:
Apr. 22, 1997
Filed:
Nov. 07, 1995
Applicant:
Inventor:
Douglas W Karraker, Muskego, WI (US);
Assignee:
Other;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03D / ;
U.S. Cl.
CPC ...
327 50 ; 327 71 ; 327355 ;
Abstract
An inverter control circuit includes means for continuously computing and subtracting an average voltage from each of three modulating input waveforms. The average voltage is computed by determining the instantaneous maximum and minimum voltages of the three waveforms, summing these voltages, and then dividing them by an averaging factor. The shifted modulating waveforms are then compared with a high-frequency carrier wave to modulate the duty cycles of the inverter outputs to approximate desired output waveform characteristics.