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Power converter possessing zero-voltage switching and output isolation

  • US 5,434,767 A
  • Filed: 01/10/1994
  • Issued: 07/18/1995
  • Est. Priority Date: 01/10/1994
  • Status: Expired due to Term
First Claim
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1. A power converter circuit for converting a voltage level across a power and a common terminal of a voltage source to a different voltage level when supplying a load, the circuit comprising:

  • an input choke having an input and an output terminal, said input terminal being connected to the power terminal of the voltage source;

    a main switching means comprising a first switch and a parallel connected diode between the output terminal of the choke and the common terminal for selectively establishing a current through said choke from said voltage source;

    a transformer having a primary and a secondary winding, said primary winding having a first and a second input terminal, said first input terminal being connected to said output terminal of said choke;

    a secondary switching means connected between the second input terminal of the transformer and the common terminal for selectively establishing a current through said transformer primary winding, said secondary switching means comprising a parallel combination of a capacitor, a diode and a second switch connected between said second input terminal and the common terminal;

    a diode connected in series between said transformer secondary winding and the load;

    an output capacitor connected in parallel with said load; and

    means for complementarily enabling and disabling said main and said secondary switching means to control current through the transformer primary winding.

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