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High frequency, high density power conversion system

  • US 5,485,365 A
  • Filed: 04/20/1993
  • Issued: 01/16/1996
  • Est. Priority Date: 01/29/1991
  • Status: Expired due to Fees
First Claim
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1. A high-frequency, double-ended, low-loss, high power density power converter, comprising:

  • three input terminals for receiving voltage input;

    first and second transistors connected source-to-drain at a first node in series across the two outer input terminals, each said transistor having an inherent parasitic capacitance;

    first and second capacitors connected at a second node in series across the two outer input terminals, the second node comprising the third input terminal;

    a low-leakage inductance transformer for coupling power to an output, one side of the transformer primary connected to the first node, said transformer having a leakage inductance of no more than 1 uH so that said leakage inductance has a negligible effect on resonance;

    a dedicated inductor connected in series with said transformer primary between the first and second nodes, said inductor and the inherent transistor capacitance thus together forming a resonant energy storage tank on the transformer primary side of the power converter for shifting the voltage input into a sinusoidal waveform, and for transferring power stored in said transistors by reason of the inherent capacitance of said transistors;

    wherein said transformer has a magnetizing inductance at least one hundred times greater than the inductance of said dedicated inductor, said transformer thus having a large impedance which causes it to act as an open circuit and thus have a negligible effect on resonance; and

    means for switching between said transistors at the resonant frequency of said resonant energy storage tank to provide a sinusoidal output current pulse to the transformer primary at the transistor switching rate and to utilize energy stored in the inherent transistor capacitance.

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