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Switch mode power supply

  • US 6,504,733 B1
  • Filed: 02/27/2001
  • Issued: 01/07/2003
  • Est. Priority Date: 02/27/2001
  • Status: Expired due to Term
First Claim
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1. A switch mode power supply, comprising:

  • a source of an input supply voltage;

    a supply inductance coupled to said input supply voltage source;

    a capacitance coupled to said supply inductance to form a tuned, resonant circuit;

    a first switching transistor for generating pulses in said supply inductance that are coupled to a load such that in a given switching period a resonant current pulse is generated in said capacitance; and

    means for controlling said first switching transistor to provide zero voltage switching including a current sensor responsive to said resonant current in said capacitance for applying said resonant current to said first switching transistor to maintain said first switching transistor turned off during a portion of said resonant current pulse.

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