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:
Sep. 13, 2011
Filed:
May. 13, 2010
Robert S. Wrathall, Scotts Valley, CA (US);
Robert S. Wrathall, Scotts Valley, CA (US);
Other;
Abstract
A power factor correction circuit () responsive to an input power supply signal at an input supply voltage (V) that varies largely sinusoidally with time at a fundamental supply frequency contains regulator/control circuitry (, and) for measuring and removing overtones (Ior I) in the input supply current (I) or in a rectified form (I) of the input supply current. Each overtone is expressible as the product of an amplitude component (I) and a sinusoidal function (Isin [(m+1)ωt]) that varies with time at an integer multiple of the fundamental supply frequency. The regulator/control circuitry measures an overtone by determining the overtone's amplitude component. After generating an adjustment factor (S) largely as the product of that overtone's amplitude component and an associated sinusoidal function, the regulator/control circuitry adjusts the input supply current or its rectified form by an amount corresponding to the adjustment factor for each measured overtone.