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Resonant type constant voltage supply apparatus

  • US 4,563,731 A
  • Filed: 01/04/1983
  • Issued: 01/07/1986
  • Est. Priority Date: 01/07/1982
  • Status: Expired due to Fees
First Claim
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1. A constant voltage supply apparatus comprising:

  • at least an input terminal for feeding an input direct current from an external direct current source;

    at least a switching element connected in series with same input terminal for switching said input direct current;

    a converter-transformer, a primary winding of said converter-transformer being connected in series with said switching element;

    a resonance capacitor connected in series with said primary winding of said converter-transformer;

    a common input terminal connected in series with said resonance capacitor;

    a first rectifier circuit coupled to a secondary winding of said converter-transformer for producing a rectified signal from a signal appearing across terminals of said secondary winding of said converter-transformer;

    a smooth circuit for smoothing said rectified signal so as to thereby obtain a dc output voltage;

    a dc output terminal for feeding said dc output voltage to an external load;

    a control transformer, a primary winding thereof being connected in parallel with said resonance capacitor, said control transformer further having a third winding for controlling an inductance of said control transformer by means of an electric signal fed thereto as a function of said dc output voltage; and

    a second rectifier circuit coupled to a secondary winding of said control transformer for rectifying a voltage signal produced across said secondary winding of said control transformer and for directly feeding a rectified voltage to said dc output terminal of said apparatus.

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