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Control circuit for a switching DC-DC power converter including a controlled magnetic core flux resetting technique for output regulation

  • US 5,392,206 A
  • Filed: 02/12/1993
  • Issued: 02/21/1995
  • Est. Priority Date: 02/12/1993
  • Status: Expired due to Fees
First Claim
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1. A self-oscillating DC-DC power converter comprising:

  • input means for accepting a DC voltage source;

    a power transformer, responsive to the input means, having a first primary winding, a second primary winding, and a first secondary winding, wherein the first primary winding has a first terminal connected to the input means, and wherein the secondary winding has a first terminal connected to an output means;

    a switch drive, operatively connected to the input means, the first primary winding and the second primary winding;

    a first switch means, responsive to the switch drive, operatively connected to a second terminal of the first primary winding, for alternately and repeatedly applying the input means DC voltage to the first primary winding, the switch means controlling the on and off time of the power transformer corresponding to the on and off time of the switch means;

    a regulator, connected to a second terminal of the first secondary winding, for regulating the output voltage of the power converter, wherein the regulator controls the reset voltage produced by the first secondary winding during the off time of the switch means, the regulator controlling the magnetic flux reset time of the power transformer by controlling the off time of the switch means;

    output means, responsive to the regulator, for providing a regulated DC voltage at the output of the power converter.

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