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. 03, 1990
Filed:
Sep. 21, 1987
Ronald J Berthiaume, Lafayette, CO (US);
Acme Electric Corporation, East Aurora, NY (US);
Abstract
A PWM waveform generator generates the digitized waveform which may control an inverter so that the inverter output is pulse width modulated and generates a sine wave after filtering. A frequency controlling means includes a cycle clock cycling an address counter which addresses step data in a ROM, and the ROM data is fed to a PWM counter. This PWM counter has a clock input to reset a flip-flop and the output passes through a polarity switch to obtain the digitized waveform. This frequency controlling means is modified by an amplitude controlling means wherein the PWM counter is clocked at a variable frequency rate to control the width of the pulses directly proportional to the desired effective amplitude of the output waveform. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.