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Soft-start pump control system

  • US 5,545,012 A
  • Filed: 01/27/1994
  • Issued: 08/13/1996
  • Est. Priority Date: 10/04/1993
  • Status: Expired due to Fees
First Claim
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1. A soft-start pump control system for controlling a pump motor comprising:

  • switching means for supplying power to a pump motor;

    a periodic duty cycle generator for periodically actuating said switching means at a fraction of the full duty cycle, to operate the pump motor at reduced power for quieter operation;

    sensor means for sensing the current drawn by the pump motor;

    a reference circuit; and

    liquid detector means for detecting the presence of liquid to be pumped, responsive to said sensor means, and said reference circuit, for overriding said periodic duty cycle generator and actuating said switching means to operate said pump motor continuously at full power when the motor current exceeds a predetermined level indicating liquid is present.

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