Method and circuit for controlling power level in the electromag

Details Method and circuit for controlling power level in the electromag Method and circuit for controlling power level in the electromag

1989-11-22

1991-04-02

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 10493, 219492, 219 1041, H05B 606

Patent

active

050048813

ABSTRACT:
A method and circuit controls the power level in an EI cooker by using a combination of time duty ratio control and pulse width modulation control depending upon the power level established by the user. When the power level is low, the turning on and off of the power transistor is controlled by the time duty ratio control method. When the power level is high, the turning on and off of the power transistor is controlled by the pulse width modulation control method.

REFERENCES:
patent: 4467165 (1984-08-01), Kiuchi et al.
patent: 4507531 (1985-03-01), Teich et al.
patent: 4511781 (1985-04-01), Tucker et al.
patent: 4555608 (1985-11-01), Mizukawa et al.
patent: 4617442 (1986-10-01), Okuda
patent: 4686340 (1987-08-01), Fukasawa
patent: 4757176 (1988-07-01), Suzuki et al.
patent: 4764652 (1988-08-01), Lee
patent: 4810847 (1989-03-01), Ito

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