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Microprocessor controlled voltage regulating transformer

  • US 4,419,619 A
  • Filed: 09/18/1981
  • Issued: 12/06/1983
  • Est. Priority Date: 09/18/1981
  • Status: Expired due to Term
First Claim
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1. A voltage regulating transformer, comprising:

  • a. a first winding defining a first plurality of turns and having an associated input terminal adapted to be connected to a source of A.C. voltage;

    b. a second winding, electromagnetically coupled to said first winding, defining a second plurality of turns and having an associated output terminal;

    c. changer means, operated in response to an analog control signal supplied thereto, for changing the ratio of turns through which current flows through said first winding and said second winding, whereby the voltage at said output terminal varies in response to said analog control signal when A.C. voltage is applied to said input terminal;

    d. voltage output signaling means, operatively connected to said output terminal, for producing a plurality of digital voltage signals representative of the instantaneous A.C. voltage at said output terminal;

    e. digital input means for producing a reference digital voltage signal representative of the RMS voltage to be maintained at said output terminal over the period of said A.C. voltage;

    f. digital computer means having a single microprocessor for Fast Fourier Transforming said plurality of digital voltage signals from the time domain into the frequency domain to obtain a measured digital voltage signal representative of the RMS voltage at said output terminal over the period of said A.C. voltage and for generating a digital control signal representative of the difference between said measured digital voltage signal and said reference digital voltage signal; and

    g. converter means for converting said digital control signals to an analog control signal to operate said changer means,whereby said changer means is operated in response to the RMS voltage at said output terminal over the period of the A.C. voltage applied to said input terminal.

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