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Method of feedback regulating a flyback power converter

  • US 4,996,638 A
  • Filed: 02/15/1990
  • Issued: 02/26/1991
  • Est. Priority Date: 02/15/1990
  • Status: Expired due to Fees
First Claim
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1. In a flyback power converter, having a primary and a secondary, a method of regulating voltage at an isolated output load, comprising the steps of:

  • (a) comparing the voltage across said load with a reference to obtain an error signal;

    (b) comparing said error signal with a ramp signal to obtain a perturbation signal which varies in time according to the amplitude of said error signal;

    (c) feeding said perturbation signal to said secondary so that it becomes induced at said primary, said perturbation signal being summed to the magnetizing current of said primary to provide a control signal when said primary is energized;

    (d) detecting at the primary, the presence of said perturbation signal on said control signal; and

    (e) regulating the voltage at said primary according to the presence in time of said perturbation signal on said control signal to thereby compensate for voltage variations at the output load.

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