Method and apparatus for controlling electric power for...

Electric heating – Microwave heating – With control system

Reexamination Certificate

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Reexamination Certificate

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06903319

ABSTRACT:
A high-frequency dielectric heating power control method comprises: detecting the input current of an inverter circuit for rectifying the voltage of an AC power source to convert the rectified voltage into an AC voltage of a predetermined frequency; rectifying the detected current to determine an input current waveform; shaping the waveform to determine a reference waveform; determining the difference between the input current waveform and the reference waveform; and mixing the differential information and the current control output by a mix circuit to convert the mixed one into the drive output of a switching transistor of the inverter circuit.

REFERENCES:
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 4065802 (1977-12-01), Mizukawa et al.
patent: 4356371 (1982-10-01), Kiuchi et al.
patent: 4556770 (1985-12-01), Tazima et al.
patent: 4810847 (1989-03-01), Ito
patent: 7-176375 (1995-07-01), None

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