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Self-oscillating high frequency power converter

  • US 4,605,999 A
  • Filed: 03/11/1985
  • Issued: 08/12/1986
  • Est. Priority Date: 03/11/1985
  • Status: Expired due to Term
First Claim
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1. A self-oscillating power converter comprising:

  • input means for accepting a DC voltage source.a semiconductor power switch including first and second main conduction path electrodes and a control electrode and further including at least an interelectrode capacitance between the first main conduction path electrode and the control electrode and having its first main conduction path electrode coupled to the input means,a feedback network for sustaining oscillations in the power converter including;

    the interelectrode capacitance coupling the first main conduction path electrode and the control electrode, anda variable inductive circuit coupling the control electrode to the second main conduction path electrode,the interelectrode capacitance and the variable inductive circuit having reactive values such that a sinusoidal voltage is generated at the control electrode causing oscillations to occur whereby the interelectrode capacitance is sufficient to be operative as an exclusive feedback path;

    a tuned network connected to the first main conduction path electrode and having an inductive reactive impedance and operative at a frequency of oscillation as established by the feedback network for controlling a voltage waveform at the first main conduction path electrode to be continuing for a portion of a cycle of operation while the semiconductor power switch is nonconducting and to be discontinued while the semiconductor power switch is conducting.

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