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:
Nov. 21, 1989
Filed:
Jun. 08, 1988
Terris L Pennington, Edmonds, WA (US);
Rane Corporation, Everett, WA (US);
Abstract
In pulse width modulation (PWM) power regulation and amplification circuits, separate DC rectification and filtering circuitry is eliminated by providing synchronous output switching directly from an available AC source. Output switch steering logic connected to an AC power source, such as a square wave AC signal available at the secondary of an isolation transformer, receives the PWM control signal that is developed by a conventional pulse width modulator in response to an input signal and causes an output switch stage to selectively and synchronously connect the alternating current power across the load with the proper timing and polarity. Preferably the output switching stage includes a low pass filter for filtering out the higher frequency switching transients.