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:
Feb. 08, 2011
Filed:
Jan. 18, 2008
Raymond Kenneth Orr, Kanata, CA;
Roger Colbeck, Ottawa, CA;
Hartley Horwitz, Ottawa, CA;
Philip Craine, Saratoga, CA (US);
Mircea Cristian Boros, Richmond Hill, CA;
Raymond Kenneth Orr, Kanata, CA;
Roger Colbeck, Ottawa, CA;
Hartley Horwitz, Ottawa, CA;
Philip Craine, Saratoga, CA (US);
Mircea Cristian Boros, Richmond Hill, CA;
Power Integrations, Inc., San Jose, CA (US);
Abstract
A control unit controls cascaded PFC and LLC converters, the LLC converter having an input coupled to an output, of the PFC converter and providing an output voltage that decreases with increasing switching frequency. The control unit produces a sawtooth waveform with a linear ramp for controlling the LLC converter switching frequency, and hence its output voltage, in dependence upon a feedback signal. It also produces for the PFC converter a PWM signal with a frequency that is the same as or an integer fraction of the LLC converter switching frequency, by comparing two thresholds with the linear ramp in respective different cycles of the sawtooth waveform to turn on and off a switch of the PFC converter during these different cycles. Logic circuits prevent PFC converter switch transitions from occurring simultaneously with switching transitions of the LLC converter.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile