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Power conversion circuit for synthesizing a sinewave with programmed amplitude control

  • US 4,520,437 A
  • Filed: 07/14/1983
  • Issued: 05/28/1985
  • Est. Priority Date: 07/14/1983
  • Status: Expired due to Fees
First Claim
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1. A power conversion circuit for synthesizing a low frequency sinewave signal;

  • input means for accepting a source of energy,means for converting the energy at the input means into a pulse carrier signal,means for modulating the pulse carrier signal by supplying timing signals to the means for converting, comprising;

    means for generating timing signals, including;

    a data processor under stored program control, a memory including a stored program for controlling the processor and a plurality of tables including timing signal data, each table being responsible for producing a different output sinewave signal amplitude, whereby the stored program selects one of the plurality of tables and utilizes its timing signal data for generating timing signals operative for modulating the pulse carrieroutput means for coupling to a load and including filtering means,means for detecting an average current overload condition,means for limiting average current output responsive to the means for detecting including;

    instructions in the stored program for selecting a different one of the plurality of tables of timing signal data for reducing an amplitude of the output sinewave signal and continuing to select different ones of the plurality of tables to successively reduce amplitude of the output sinewave signal until the average current overload condition is corrected.

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