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Load compensating gain control for a series resonant inverter

  • US 4,969,076 A
  • Filed: 08/14/1989
  • Issued: 11/06/1990
  • Est. Priority Date: 08/14/1989
  • Status: Expired due to Term
First Claim
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1. An improved dc-to-dc converter, comprising:

  • a resonant inverter having two pairs of controllable switch means, the switch means of each pair being connected in series to define a respective junction therebetween and each pair of series-connected switch means being adapted to be connected in parallel across an external dc supply;

    a series resonant circuit connected between the junctions of said controllable switch means and comprising a capacitor and an inductor, said inverter being adapted to apply a rectangular wave voltage to said series resonant circuit;

    a full wave rectifier inductively coupled to said series resonant circuit, the output of said rectifier being adapted to supply a substantially constant preselected output voltage at a substantially constant output current to a load; and

    load compensating gain control means for maintaining a substantially constant inverter loop gain by multiplying a load compensation factor corresponding to said preselected output voltage and to said output current of said inverter with a voltage gain of said inverter.

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