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CONTROL HAVING CONDUCTION LIMIT MEANS TO VARY DUTY CYCLE OF POWER SWITCH

  • US 3,855,520 A
  • Filed: 12/22/1972
  • Issued: 12/17/1974
  • Est. Priority Date: 12/22/1972
  • Status: Expired due to Term
First Claim
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1. A control for supplying variable duty cycle pulses from an electrical power source to a load including, in combination, means for providing a succession of control pulses, means for selectively varying the duty cycle of said control pulses, a power switch regulated by said control pulses for connecting said power source to said load, conduction limit means for sensing the voltage across said power switch and for generating a conduction limit signal when said voltage exceeds a predetermined magnitude, and means responsive to said conduction limit signal for overriding said duty cycle varying means and reducing the duty cycle of said control pulses.

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