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. 27, 2002
Filed:
Aug. 30, 2001
William Hemena, Raleigh, NC (US);
Thai Quoc Ngo, Rochester, MN (US);
Scott Douglas Strand, Byron, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A high efficiency power converter and method of operation thereof. The high efficiency power converter includes a preregulator circuit that provides a regulated intermediate DC voltage to a low impedance output stage. The low impedance output stage includes first and second power transformers, where each of the power transformers has first and second primary windings of opposite polarity and a secondary winding. The low impedance output stage also includes first and second switches that alternatively couple the first primary windings of the first and second power transformers, respectively, to the regulated intermediate DC voltage. The low impedance output stage further includes first and second coupling capacitors that couple the second primary windings of the first and second power transformers to the second and first switches, respectively, and are utilized to reset the first and second power transformers with minimum losses.