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Drive circuit for reactive loads

  • US 5,926,093 A
  • Filed: 08/15/1997
  • Issued: 07/20/1999
  • Est. Priority Date: 08/15/1997
  • Status: Expired due to Term
First Claim
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1. A circuit for driving a reactive load with high efficiency, the circuit comprising:

  • a driver circuit for converting DC input current to RF output current, the driver circuit including only one switch, the driver circuit further including a switch capacitor and a switch inductor, the switch having a nonlinear output capacitance, the switch capacitor being equal to a maximum of the switch output capacitance to minimize the effects of the nonlinear output capacitance of the switch, wherein the switch capacitor has a value of (1/(2π

    FsXcs)), wherein Xcs≦

    Rs/2, Fs being the resonance frequency of the switch, Xcs being the impedance of the switch capacitor, and Rs being the series output resistance of the driver circuits;

    an output resonant circuit including the reactive load; and

    a coupling reactance coupled in series between the RF output current of the driver circuit and an input of the output resonant circuit, the coupling reactance performing a series to parallel impedance match from the driver circuit to the output resonant circuit.

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