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Voltage, phase and frequency control by miniature inverter system

  • US 5,672,950 A
  • Filed: 08/16/1994
  • Issued: 09/30/1997
  • Est. Priority Date: 08/16/1994
  • Status: Expired due to Fees
First Claim
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1. A method of controlling a variable speed AC motor, comprising the steps of:

  • selecting a predetermined operational speed for said variable speed AC motor;

    determining an optimal pulsewidth and pulse repetition frequency for an AC pulsed voltage used to drive said AC motor at said predetermined operational speed;

    generating a first low voltage AC pulse train having pulses occurring at said pulse repetition frequency and said pulsewidth;

    converting an AC line signal into an altered AC signal by passing said AC line signal through a switch controlled by said first low voltage AC pulse train;

    producing a DC voltage by combining and rectifying said AC line signal with said altered AC signal;

    amplifying said first AC pulse train to provide a AC pulsed voltage having said pulse repetition frequency and said pulsewidth;

    modifying said AC pulse voltage to have an amplitude magnitude proportional to said DC voltage; and

    providing said AC pulsed voltage to said AC motor to drive said AC motor at said operational speed.

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