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    Bridge-buck converter with self-driven synchronous rectifiers

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    6859372.pdf (535.2Kb)
    Downloads: 81
    Publication Date
    2005-02-22
    Filing Date
    2003-06-05
    Inventor
    Lee, Fred C.
    Xu, Ming Gang
    Zhou, Jinghai
    Metadata
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    Abstract
    A non-isolated bridge-buck DC—DC converter has self-driven synchronous rectifiers Q5 Q6 in the buck circuits 28 30. Gate electrodes of the synchronous rectifiers Q5 Q6 are connected to midpoints 24A 24B of the bridge circuit. The voltage at the midpoints provides the necessary voltage waveform for switching the synchronous rectifiers Q5 Q6. In another aspect of the invention, voltage shift circuits 34 are provided between the midpoints and the gates of the synchronous rectifiers. The voltage shift circuits are necessary in some embodiments to make sure that the synchronous rectifiers are turned completely OFF when necessary. The present invention provides a more power efficient and less expensive technique for controlling the synchronous rectifiers compared to conventional external driver circuitry.
    Assignee
    Virginia Tech Intellectual Properties, Inc.
    Patent Number
    6859372
    Application Number
    10454779
    Source URL
    http://pimg-fpiw.uspto.gov/fdd/72/593/068/0.pdf
    Primary/U.S. Class
    363/17
    Other/U.S. Class
    363/127
    363/132
    CPC Class
    H02M3/33569
    Patent Type
    utility
    URI
    http://hdl.handle.net/10919/72504
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