Electric heating – Metal heating – Of cylinders
Patent
1987-04-22
1988-08-16
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 10493, 363 97, H05B 606
Patent
active
047646527
ABSTRACT:
A power control device for high-frequency induced heating cooker is designed to supply a constant power to the work coil regardless of any change in the input current and voltage. The control device compares the voltage detected at the input current sensor detecting the input current of the full-wave rectifier with the set voltage of the user selector and applies a control voltage to the pulse oscillator and applies the pulse oscillating signal of the pulse oscillator to the driver and makes the switching transistor rapidly turn on and off to generate a high-frequency current through the work coil. It includes a voltage sensor to detect the input and output voltages of the coil, a comparator to compare both detector voltages and to determine the drive starting point of the oscillator, a subtractor to subtract the voltage on the input side of the work coil from the set voltage of the user selector, a comparator to compare the voltage detected at the input current sensor with the normal vessel reference voltage, a transistor to cut off the control voltage applied to the pulse oscillator, a search control voltage part to produce a search control voltage of a constant level and a starting circuit part to generate an oscillation signal of a constant cycle, and a transistor turned on and off by the oscillation signal and supplies the search control voltage to the pulse oscillator in a constant period.
REFERENCES:
patent: 4356371 (1982-10-01), Kiuchi et al.
patent: 4447691 (1984-05-01), Mizukawa et al.
patent: 4467165 (1984-08-01), Kiuchi et al.
patent: 4540866 (1985-09-01), Okuda
patent: 4599504 (1986-07-01), Ito
Gold Star Co. Ltd.
Leung Philip H.
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