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Multi-loop control for quasi-resonant converters

  • US 4,866,367 A
  • Filed: 04/11/1988
  • Issued: 09/12/1989
  • Est. Priority Date: 04/11/1988
  • Status: Expired due to Fees
First Claim
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1. A multi-loop controller/for controlling a quasi-resonant converter having a power switch, a filter inductor and an output voltage, said controller comprising:

  • means for sensing the output voltage of said converter;

    means for detecting the filter inductor current;

    referencing means for comparing said output voltage with a known reference voltage to develop a control error voltage when said output voltage exceeds said reference voltage;

    comparing means for comparing said inductor current with the output of said referencing means and producing a control signal when a predetermination relationship has been detected; and

    activating means responsive to said control signal for turning the power switch on.

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