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Variable-frequency inverter microwave oven and method for controlling the same

  • US 20040144776A1
  • Filed: 07/31/2003
  • Published: 07/29/2004
  • Est. Priority Date: 01/27/2003
  • Status: Active Grant
First Claim
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1. A variable-frequency inverter microwave oven comprising:

  • a magnetron for generating electromagnetic waves;

    direct current (DC) voltage generation means for rectifying and smoothing a commercial alternating current (AC) voltage to generate a DC voltage, said commercial AC voltage being an inverter drive voltage;

    switching means for performing a switching operation based on said DC voltage from said DC voltage generation means to generate an AC voltage for the driving of said magnetron, said switching means including a plurality of switches turned on/off in response to said DC voltage from said DC voltage generation means;

    variable-frequency control means for varying a switching frequency of said switching means according to a level of said DC voltage from said DC voltage generation means to maintain said AC voltage from said switching means at a constant level; and

    magnetron drive voltage generation means for converting said AC voltage from said switching means into a high-power DC voltage and transferring the converted DC voltage to said magnetron to drive it.

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