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:
Jul. 25, 1995
Filed:
Jun. 09, 1993
Kaz Furmanczyk, Marysville, WA (US);
ELDEC Corporation, Lynnwood, WA (US);
Abstract
One PWM control circuit is located in the primary side of a power converter and is isolated from the secondary side, and another PWM control circuit is located in the secondary side of the converter and is isolated from the primary side. The first PWM control circuit is powered by a direct tap to the input line of the converter and, during start-up, supplies a low power square wave coupled directly to switching transistors of an inverter of the power converter. After start-up, the second PWM control circuit is powered by a direct tap to the secondary side and supplies a regulating square wave output to the switching transistors through an isolation component such as a coil. After start-up, the primary PWM control circuit is disabled so that, under normal operating conditions, the power supply is regulated only by the second PWM control circuit. The improved power converter has the advantages of direct feedback to the second PWM, without an additional, isolated power supply being required to drive the second PWM.