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Switching dc-to-dc converters

  • US 4,577,268 A
  • Filed: 09/20/1984
  • Issued: 03/18/1986
  • Est. Priority Date: 12/20/1982
  • Status: Expired due to Fees
First Claim
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1. A switching dc-to-dc converter comprising:

  • first and second terminals for receiving therebetween the primary dc energy to be converted;

    a flyback transformer having first and second windings, which first and second windings have respective first and second ends, with currents of opposite polarities tending to flow from their first ends responsive to waxing or waning of the strength of the electromagnetic field surrounding them, the first end of said second winding being connected to said first terminal;

    means recurrently applying an input current during a first series of time intervals to the first winding of said flyback transformer, to cause the waxing of the strength of an electromagnetic field for storing energy to be released by the waning of the strength of said electromagnetic field during a second series of time intervals interleaved with said first series of time intervals, which means includesmeans for selectively connecting during each time interval in said first series the first end of said first winding to said second terminal, and includesmeans for selectively connecting during each time interval in said first series the second end of said first winding to said first terminal;

    a third terminal;

    a capacitor connected between said first and third terminals;

    means for recovering flyback current flow from the second winding of said flyback transformer during said second series of time intervals and combining it with transformed input current flow from said second winding during said first series of time intervals to provide an output current flow through said third terminal that continues to flow during both said first and second series of time intervals, which means includesa dc-conductive impedance element having a first end connected to said third terminal and having a second end,means for selectively connecting during said first series of time intervals the second end of said d-c conductive element and the second end of said second winding,means for selectively connecting during each time interval in said second series the second end of said dc-conductive impedance element and a point on said first winding remote from its first end by the same number of turns as in said second winding, andmeans for selectively connecting during each time interval in said second series said first terminal and the first end of said first winding.

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