Drive control method for an electromagnetic induction heating ap

Details Drive control method for an electromagnetic induction heating ap Drive control method for an electromagnetic induction heating ap

1989-01-27

1991-06-25

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 10493, 219 1077, H05B 608

Patent

active

050269550

ABSTRACT:
A method for controlling the drive of an electromagnetic induction heating apparatus jointly utilizing a time control method and a linear control method. The method includes the steps of storing pulse signals and reset pulse signals in addresses of a memory of a micro-processor, short-circuiting an ON/OFF switch by storing pulse signals of different widths in addresses of the memory, controlling a power transistor by a time control method when the power level is below a predetermined level, and controlling the power transistor by a linear control method when the power level is above a predetermined level. Thereby, a flicker effect and noise as prevented from being generated.

REFERENCES:
patent: 3775577 (1973-11-01), Peters, Jr.
patent: 3919621 (1975-11-01), Wechsler
patent: 4564733 (1986-01-01), Karklys
patent: 4749836 (1988-06-01), Matsuo et al.

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