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CONVERTER AND CONTROL METHOD THEREOF

  • US 20190280604A1
  • Filed: 01/13/2019
  • Published: 09/12/2019
  • Est. Priority Date: 03/09/2018
  • Status: Active Grant
First Claim
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1. A converter, comprising:

  • a transformer comprising a primary winding and a secondary winding;

    a primary side switch electrically coupled to the primary winding and a primary ground terminal;

    a secondary side switch electrically coupled to the secondary winding and a load;

    a load detection circuit configured to detect a load state and correspondingly output a load state signal;

    a state detection circuit configured to detect a reference time point; and

    a control circuit configured to output a control signal to turn on or turn off the primary side switch, wherein the control circuit is configured to set a blanking time according to the load state signal, such that the primary side switch is turned on when a drain-source voltage of the primary side switch is at a valley of a resonance after the blanking time starting from the reference time point.

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