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Induction heating apparatus

  • US 6,608,291 B1
  • Filed: 03/19/2001
  • Issued: 08/19/2003
  • Est. Priority Date: 03/20/2000
  • Status: Expired due to Fees
First Claim
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1. An induction heating apparatus, comprising:

  • a solid state power generator capable of driving a variable impedance, said generator operating with a switching regulator for generating current at a high frequency;

    an induction coil assembly connected to said solid state power generator, said induction coil assembly including a capacitive circuit portion coupled to a conductive coil, wherein said conductive coil operates responsive to said high frequency current to generate a magnetic field for inductively coupling with a susceptor, thereby substantially rapidly heating said susceptor'"'"'s material;

    said solid state power generator including a power output stage driven under feedback control so as to effectuate resonance in said induction coil assembly at around said high frequency; and

    said power output stage including a pre-driver circuit portion coupled to a driver circuit portion, wherein said pre-driver circuit portion comprises a plurality of buffer circuits disposed in parallel, each buffer circuit operating to drive a transformer coupled to a field effect transistor (FET) device, and said transformer and said FET device forming at least a part of said driver circuit portion.

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