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. 11, 2003
Filed:
Jun. 18, 2001
DaFeng Weng, San Jose, CA (US);
Jinrong Qian, Croton-on-Hudson, NY (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A method and circuit for clamping a voltage across a switching element in a forward converter circuit to a value equal to or less than the DC bus voltage. The disclosed circuit and method achieves voltage clamping in a circuit configuration in which two series connected direct current (DC) bus capacitors are connected in parallel with a switching element to be clamped. Clamping is further achieved by selecting capacitor values to be sufficiently large so as to maintain a constant voltage throughout each switching cycle of the switching element. The capacitors serve a second function in that they recover energy stored in the windings of an isolation transformer which would otherwise be dissipated in a conventional circuit design.