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Method and apparatus for compensating phase distortion caused by a high impedance voltage source

  • US 5,963,022 A
  • Filed: 06/05/1997
  • Issued: 10/05/1999
  • Est. Priority Date: 06/05/1997
  • Status: Expired due to Fees
First Claim
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1. A method for generating an internal timebase phase reference for providing a sequence of phase angle firing signals to couple an AC line voltage source to a load, the method comprising:

  • A. generating the internal timebase phase reference;

    B. measuring the AC line voltage to determine its phase error relative to the internal timebase phase reference;

    C. estimating phase distortion generated by the coupling of the AC line voltage source to the load as a result of the load being energized from the phase angle firing control in the presence of line impedance;

    D. adjusting the internal timebase phase reference in response to the estimated phase distortion.

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