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DC/DC converter switching at zero voltage

  • US 4,959,764 A
  • Filed: 11/14/1989
  • Issued: 09/25/1990
  • Est. Priority Date: 11/14/1989
  • Status: Expired due to Term
First Claim
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1. A single ended, zero voltage switching converter circuit comprising:

  • a first inductive element having a first terminal and a second terminal;

    a first switching means for selectively coupling power from a power supply to said first inductive element, said first switching means including an intrinsic capacitance;

    a first capacitive element having a first plate and a second plate, the first plate connected to the first terminal of said first inductive element;

    a second switching means connected to the second plate of said first capacitive element and in series with said first capacitive element across said first inductive element, said second switching means including an intrinsic capacitance;

    a first diode having a first terminal and a second terminal, the first terminal of said first diode connected to the first terminal of said first inductive element;

    a second diode having a first terminal and a second terminal, the first terminal of said second diode connected to the second terminal of said first inductive element, and the second terminal of said second diode connected to the second terminal of said first diode;

    a second inductive element having a first terminal and a second terminal, the first terminal connected to the second terminals of said first and second diodes, and the second terminal connected to an output of said converter circuit;

    a third diode in parallel with said first switching means; and

    a fourth diode in parallel with said second switching means;

    wherein energy stored in said first inductive element discharges the intrinsic capacitance of said first switching means prior to turning on said first switching means, and wherein energy stored in said first inductive element discharges the intrinsic capacitance of said second switching means prior to turning on said second switching means.

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