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    Power converters having capacitor resonant with transformer leakage inductance

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    7196914.pdf (694.4Kb)
    Downloads: 72
    Publication Date
    2007-03-27
    Filing Date
    2004-11-19
    Inventor
    Lee, Fred C.
    Xu, Ming Gang
    Ren, Yuancheng
    Metadata
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    Abstract
    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
    Source URL
    http://pimg-fpiw.uspto.gov/fdd/14/969/071/0.pdf
    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
    URI
    http://hdl.handle.net/10919/72558
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