D.C. power supply circuit

  • US 4,024,437 A
  • Filed: 11/04/1975
  • Issued: 05/17/1977
  • Est. Priority Date: 11/14/1974
  • Status: Expired due to Term
First Claim
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1. A power supply protection circuit comprising:

  • an oscillation circuit having means for changing its conduction angle in accordance with the magnitude of an input signal applied thereto,a d.c. power source,a switching device coupled to an output of said oscillation circuit for switching power from said d.c. power supply to a load in response to the output of said oscillation circuit,means for developing a control signal indicative of the voltage at the load and for coupling said control signal to said oscillation circuit to regulate the conduction angle thereof,a momentary excessive current sensing means coupled to a circuit point bearing a signal derived from said switching device for sensing momentary excessive current present in said switching device and for generating a momentary excessive current control signal,means for coupling said momentary excessive current control signal to said oscillation circuit for suppressing the conduction angle thereof,an average excessive current sensing means connected to a circuit point bearing a signal derived from said switching device for developing an average excessive current control signal,shut-off means for turning off said oscillation circuit in response to said average excessive current control signal, andmeans for connecting said average excessive current control signal to said shut-off means.

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