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. 25, 2001
Filed:
Feb. 14, 2000
Circuit for efficiently clamping a power converter's reset voltage and for providing auxiliary power
David Anthony Smith, Cummer Hill, GB;
Astec International Limited, Hong Kong, HK;
Abstract
In a power converter whose power is supplied by an input power source, a circuit is disclosed for efficiently clamping the peak reset voltage across a primary switch of the power converter and for recycling the energy stored in the clamp during the OFF period of the switch back to the input power source via a second converter through the operation of a plurality of switching transistors in the second converter. The reset energy of the power transformer in the power converter can also be coupled to an auxiliary power circuit via a winding of a transformer in the second converter. The second converter can thus provide auxiliary or stand-by power to maintain the operation of critical system circuits, when the power converter is turned off, e.g., to conserve power, such as in the sleep mode of a portable PC.