Power converters having capacitor resonant with transformer leakage inductance

Publication Date
2007-03-27Filing Date
2004-11-19Inventor
Lee, Fred C.
Xu, Ming Gang
Ren, Yuancheng
Metadata
Show full item recordAbstract
Power converters having reduced body diode conduction loss, reduced reverse recovery loss and lower switching noise, among other benefits, have a resonant capacitor Cr connected across an unfiltered output. The resonant capacitor Cr resonates with the leakage inductance Lk of the transformer. The resonant capacitor and leakage inductance are selected such that ½ a LC resonance period is equal to an ON time of each secondary switch S1 S2. The resonance provides zero current switching for secondary switches S1 S2, eliminates zero body diode conduction during dead times, and eliminates reverse recovery losses in the secondary switches. The present invention is applicable to many different circuit topologies such as full bridge, active clamp forward, push-pull forward, and center-tap secondary. The present converters provide high energy conversion efficiency and high frequency operation.
Assignee
Virginia Tech Intellectual Properties, Inc.
Patent Number
7196914
Application Number
10992227
Primary/U.S. Class
363/21.14
Other/U.S. Class
363/17
CPC Class
H02M3/33592
H02M3/33569
Y02B70/1433
Y02B70/1475
Patent Type
utility
Collections
- Virginia Tech Patents [687]