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Methods and apparatus for actively snubbing waveforms in switching regulators

  • US 6,051,963 A
  • Filed: 10/09/1998
  • Issued: 04/18/2000
  • Est. Priority Date: 10/09/1998
  • Status: Expired due to Term
First Claim
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1. A method for snubbing waveforms in a switching regulator while maintaining regulator efficiency, said switching regulator including an inductor, a power switch and a rectifying diode electrically coupled to said inductor, a snubber circuit comprising a snubber switch, said snubber circuit being coupled in parallel to said inductor, the method comprising:

  • beginning a switching cycle by switching said power switch CLOSED while said snubber switch is OPEN;

    switching said power switch OPEN while said snubber switch is OPEN;

    switching said snubber switch CLOSED while said power switch is OPEN;

    decaying current flowing through said inductor via said snubber circuit when said rectifying diode self-commutates so that current in said inductor is prevented from repeatedly changing polarity; and

    switching said snubber switch OPEN to end said switching cycle.

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