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. 03, 2004
Filed:
Feb. 20, 2003
Delta Electronics, Inc., Taoyuan, TW;
Abstract
The invention relates to an active snubber for synchronous rectifier. The active snubber is coupled across a synchronous rectifier having a first synchronous MOSFET and a second synchronous MOSFET coupled to a transformer in a power converter. The active snubber includes a series-coupled active switch and first snubber capacitor which is coupled between a drain terminal and a source terminal of the first synchronous MOSFET, a gate driver operative to keep the active switch conducting a specified period of time during a non-conduction interval of the first synchronous MOSFET. The gate driver is composed of an auxiliary winding, a capacitor, and a resistor, wherein the auxiliary winding and the capacitor are connected in series and then coupled across the resistor in parallel, which is coupled between a gate and a source of the active switch.