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Power control device for high-frequency induced heating cooker

  • US 4,764,652 A
  • Filed: 04/22/1987
  • Issued: 08/16/1988
  • Est. Priority Date: 04/23/1986
  • Status: Expired due to Term
First Claim
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1. A power control device for a high-frequency induced heating cooker having a work coil driven by inverter means comprising:

  • rectifier means for rectifying AC power supplied to the inverter means;

    input current sensor means for detecting the input current from the AC power supplied to said rectifier means;

    first comparator means for comparing the detected input current of the input current sensor means with a manually selectable reference voltage;

    pulse oscillator means for generating a rectangular pulse signal;

    driver means for applying the rectangular pulse signal to said inverter means to turn said inverter means ON to thereby apply a high frequency current through said work coil;

    voltage sensor means for detecting the voltages on both the input and output sides of the work coil;

    second comparator means for comparing both detected voltages of the voltage sensor means and determining whether the output of said first comparator means will drive said pulse oscillator means;

    means for substracting the voltage detected at the voltage sensor means on the input side of the work coil from the manually selected reference voltage;

    third comparator means for comparing the detected voltage of the input current sensor means with a reference voltage which would be generated by the presence of a normal sized cooking vessel on the work coil;

    semiconductor switch means for cutting OFF a high potential output signal of the third comparator means;

    search control voltage means for generating an oscillating signal during a predetermined period;

    starting circuit means for generating an oscillating signal during the predetermined period; and

    transistor means turned ON and OFF by the oscillating signal of the starting circuit means for cutting OFF the supply of the search control voltage to said pulse oscillator means at a predetermined time.

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