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SWITCHING REGULATOR SWEEP STARTING PROTECTION CIRCUIT

  • US 3,733,540 A
  • Filed: 02/03/1972
  • Issued: 05/15/1973
  • Est. Priority Date: 02/03/1972
  • Status: Expired due to Term
First Claim
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1. A switching power supply control circuit for controlling the output voltage applied to an output point from a direct current source, including in combination, switch means connected to said source and to said output point for controlling the output voltage delivered to said output point by said source, said switch means having a conductive state for passing current to said load and a nonconductive blocking state, pulse control means for rendering said switch means conductive for a predetermined time duration connected to said switch means, said pulse control means being further connected to said output point and responsive to the voltage thereat for adjusting said time duration in a manner tending to maintain said output voltage substantially constant, rate control means for causing said switch means to be rendered alternately conductive and nonconductive at a predetermined rate connected to said pulse control means, said rate control means being further connected to said output point and responsive to the voltage thereat for causing said switch means to be alternately rendered conductive and nonconductive at a rate lower than said predetermined rate when the output voltage at said output point is below a predetermined level.

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