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Circuits and methods for synchronous rectification in resonant converters

  • US 9,887,634 B2
  • Filed: 07/23/2015
  • Issued: 02/06/2018
  • Est. Priority Date: 07/23/2015
  • Status: Active Grant
First Claim
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1. A resonant converter comprising:

  • a resonant converter primary stage including;

    a first switch;

    a second switch coupled in series with the first switch;

    a controller coupled to the first switch and the second switch and programmed to control operation of the first switch and the second switch;

    a first transformer comprising a primary coil coupled to a node between the first switch and the second switch; and

    a resonant inductor coupled to the primary coil of the first transformer;

    a resonant converter secondary stage including;

    a second transformer comprising;

    a primary coil coupled to the resonant inductor; and

    a secondary coil comprising a first coil section and a second coil section coupled to the first coil section;

    a third switch coupled to the first coil section of the secondary coil of the second transformer; and

    a fourth switch coupled to the second coil section of the secondary coil of the second transformer; and

    a switch drive circuit configured to drive the third switch and the fourth switch for synchronous rectification, wherein the switch drive circuit comprises a secondary coil of the first transformer.

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