High-efficiency adaptive DC/AC converter

CAFC
  • US 6,259,615 B1
  • Filed: 11/09/1999
  • Issued: 07/10/2001
  • Est. Priority Date: 07/22/1999
  • Status: Expired due to Term
First Claim
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1. A DC/AC converter circuit for controllably delivering power to a load, comprising an input voltage source;

  • a first plurality of overlapping switches and a second plurality of overlapping switches being selectively coupled to said voltage source, said first plurality of switches defining a first conduction path, said second plurality of switches defining a second conduction path;

    a pulse generator generating a first pulse signal;

    a transformer having a primary side and a secondary side, said primary side selectively coupled to said voltage source in an alternating fashion through said first conduction path and, alternately, through said second conduction path;

    a load coupled to said secondary side of said transformer; and

    a feedback control loop circuit receiving a feedback signal indicative of power being supplied to said load, and adapted to generate a second signal pulse signal for controlling the conduction state of said second plurality of switches only if said feedback signal is above a predetermined threshold; and

    drive circuitry receiving said pulse signal and controlling a conduction state of said first and second plurality of switches based on said first and second pulse signals, wherein, said drive circuitry alternating the conduction state of said first and second plurality of switches, controlling the overlap time of the switches in the first plurality of switches, and controlling the overlap time of the switches in the second plurality of switches, to couple said voltage source to said primary side.

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