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High frequency push-pull converter with input power factor correction

  • US 5,510,974 A
  • Filed: 12/28/1993
  • Issued: 04/23/1996
  • Est. Priority Date: 12/28/1993
  • Status: Expired due to Fees
First Claim
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1. A single stage boost converter and high-frequency DC/AC power inverter apparatus comprising:

  • a pair of input terminals for connection to a source of AC voltage,rectifier means having an input coupled to said pair of input terminals and an output,a transformer having first and second primary windings and a secondary winding,inductor means coupling said first and second transformer primary windings to said output of the rectifier means,a pair of first and second switching transistors coupled to said first and second transformer primary windings to control current flow therein,a storage capacitor coupled to said first and second transformer primary windings and to the output of the rectifier means,a pair of output terminals for connection to a load,an LC resonant circuit coupling said transformer secondary winding to said pair of output terminals, anda single control circuit responsive to an output voltage at said output terminals and, via a circuit path independent of a load circuit coupled to said output terminals, to a voltage developed across the storage capacitor, thereby to supply complementary switching control signals to respective control electrodes of said first and second switching transistors.

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