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Electrical control circuit

  • US 4,375,613 A
  • Filed: 07/26/1979
  • Issued: 03/01/1983
  • Est. Priority Date: 12/14/1976
  • Status: Expired due to Term
First Claim
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1. In a circuit arrangement for use with electric motors having a start winding and a run winding and comprising(a) sensing means having an output and operative to generate a control signal at said output in response to the flow of current in said run winding,(b) threshold means responsive to said control signal to generate a firing signal in response to said control signal exceeding a predetermined threshold, and(c) means connected to said threshold means so as to be responsive to said firing signal and operative to control the supply of current to said start winding,the improvement wherein said threshold means comprises an MOS integrated circuit multivibrator operative to generate said firing signal as a pulse train, said output of said sensing means being connected to the supply inputs of said multivibrator whereby said threshold is defined by the inherent switching characteristics of said multivibrator.

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