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Zero voltage, zero current, resonant converter

  • US 5,177,675 A
  • Filed: 10/16/1991
  • Issued: 01/05/1993
  • Est. Priority Date: 10/16/1991
  • Status: Expired due to Term
First Claim
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1. A resonant power converter for changing the magnitude of a DC voltage, over an operating power range, comprising:

  • a main transformer having core means, and primary winding means for effecting alternate flux flow in opposite directions through said core means,control switch means for effecting alternate pulses of current flow through said primary winding means to effectuate said alternate flux flow,said control switch means and said primary winding means having a predetermined parasitic capacitance with a predetermined delay time between the termination of a given pulse and initiation of the succeeding pulse,said transformer including a pair of secondary winding oriented to conduct alternately in phase with said alternate flux flow,there being inherent in said main transformer a magnetizing inductance, such that the magnetizing current will be great enough to charge said parasitic capacitance in a controlled fashion,secondary circuit means including said secondary windings and having rectifying means therein for rectifying the currents in said secondary windings,output circuit means having output terminal means and an output capacitor,circuit means for applying the rectified current from said rectifying means to said output terminal means in the form of a load current,tank circuit means comprising transformer means having load current winding means positioned in the converter to be responsive to the load current,a tank winding linked magnetically to said load current winding means,and tank capacitor means in parallel with said tank winding.

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