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Power control system

  • US 4,673,888 A
  • Filed: 09/02/1986
  • Issued: 06/16/1987
  • Est. Priority Date: 09/02/1986
  • Status: Expired due to Fees
First Claim
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1. A power supply for providing an output voltage amplitude modulated by a command signal, comprising:

  • first rectifier means for rectifying said command signal;

    means for providing a plurality of reference voltages;

    a plurality of comparator means for comparing the level of said rectified command signal individually with said plurality of reference voltages, respectively, each one of said plurality of comparator means changing the level of its output signal from "low" to "high" in response to said rectified command signal exceeding the level of the associated one of said reference voltages, respectively;

    a plurality of output transformers each including a primary winding, and each sharing at least one common secondary winding, one end of each primary winding being connected in common;

    a source of +E and -E volts DC;

    first switching means for alternately and successively applying at a predetermined frequency +E and -E volts, respectively, to said one end of each one of said plurality of primary windings;

    a plurality of second switching means, each having an output terminal connected individually to the other ends of said plurality of primary windings, for alternately and successively applying at said predetermined frequency +E and -E volts, respectively, to said other ends of each one of said plurality windings, respectively;

    first control means responsive to the level of the output signals from said plurality of comparator means associated with individual ones of said plurality of second switching means, respectively, for (1) when a given one of said comparator means has a high output level operating the associated one of said plurality of second switching means for alternately and successively applying +E and -E volts across the associated said primary winding, in opposite polarity over each half-cycle of operation, for adding the voltage contribution from the associated primary winding to said secondary winding, and (2) when a given one of said comparator means has a low output level operating the associated one of said plurality of second switching means substantially asynchronously with said first switching means, for alternately and successively connecting the ends of an associated one of said primary windings to +E or -E volts over each half-cycle of operation, respectively, for removing that said primary windings voltage contribution from said secondary winding, thereby producing in said secondary winding a pulsed voltage waveform at said predetermined frequency, amplitude modulated by said command signal.

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