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CONTROL CIRCUIT FOR SYNCHRONOUS RECTIFYING AND SOFT SWITCHING OF POWER CONVERTERS

  • US 20090091951A1
  • Filed: 10/03/2007
  • Published: 04/09/2009
  • Est. Priority Date: 10/03/2007
  • Status: Active Grant
First Claim
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1. A control circuit for soft switching and synchronous rectifying of a power converter, comprising:

  • an integrated synchronous rectifier comprising;

    a cathode terminal, coupled to a secondary side of a power transformer;

    an anode terminal, coupled to an output of the power converter;

    a first input-signal terminal; and

    a second input-signal terminal,wherein the integrated synchronous rectifier includes a controller and a power transistor connected between the cathode terminal and the anode terminal; and

    the first input-signal terminal and the second input-signal terminal are coupled to the controller to receive a pulse signal for switching on/off the power transistor;

    a switching-signal circuit comprising;

    an input terminal coupled to receive a switching signal;

    a first output-signal terminal; and

    a second output-signal terminal,wherein the switching signal is used for regulating the power converter by switching the power transformer;

    the first output-signal terminal and the second output-signal terminal are coupled to a pulse generation circuit to generate the pulse signal in response to a leading edge and a trailing edge of the switching signal; and

    an isolation device, coupled between the first input-signal terminal and the second input-signal terminal of the integrated synchronous rectifier, and the first output-signal terminal and the second output-signal terminal of the switching-signal circuit.

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