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:
Aug. 02, 2005
Filed:
May. 02, 2003
Roger Peter Colbeck, Stittsville, CA;
Rajko Duvnjak, Kanata, CA;
Roger Peter Colbeck, Stittsville, CA;
Rajko Duvnjak, Kanata, CA;
Potentia Semiconductor, Inc., Wilmington, DE (US);
Abstract
A switch mode power supply and its start-up circuit produce a controlled output voltage from an input voltage. A power supply control circuit is powered by the output voltage and is responsive to the output voltage to control the power supply. The control circuit responds to differences between a fraction of the output voltage and a reference voltage to control the start-up circuit. This control is inhibited at low values of the output voltage to ensure that the power supply starts up correctly despite the reference voltage being indefinite or unstable at such low values of the output voltage.