Synchronous rectifier having precise on/off switching times
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United States of America Patent
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Sep 6, 2011
Grant Date -
Sep 4, 2008
app pub date -
Dec 20, 2007
filing date -
Dec 22, 2006
priority date (Note) -
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Abstract
A synchronous rectifier, including an energy storage element having a terminal; a power supply input, connected to the terminal of the storage element in a first time interval; a reference line connected to the terminal of the storage element in a second time interval; and a zero comparator, coupled to the terminal of the storage element to detect a current flowing in the energy storage element and disconnect the terminal of the storage element from the reference line upon detecting a zero current, the zero comparator having an offset and a propagation time; the zero comparator further having an offset control input and an output. An offset regulating loop is coupled between the output of the zero comparator and the offset control input and regulates the offset of the zero comparator to compensate the propagation time.
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