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Control of stirling cooler displacement by pulse width modulation of drive motor voltage

  • US 5,156,005 A
  • Filed: 05/24/1991
  • Issued: 10/20/1992
  • Est. Priority Date: 05/24/1991
  • Status: Expired due to Fees
First Claim
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1. A method for controlling, as a function of a control input signal, the amplitude of the fundamental component of an AC signal applied to a reactive load having an operating frequency, said method comprising:

  • (a) generating a pulse train having a pulse repetition frequency which is a harmonic of said operating frequency;

    (b) modulating the duty cycle of said pulse train as a function of said control input;

    (c) applying said modulated pulse train to said load during one-half of its operating period; and

    (d) applying the complement of said pulse train to said load during the other half of its operating period.

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