High-frequency heating device for variably controlling a high fr

Details High-frequency heating device for variably controlling a high fr High-frequency heating device for variably controlling a high fr

1974-01-31

1976-02-17

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

307247R, 307252T, 323225C, 323 24, 331 87, H05B 906

Patent

active

039393194

ABSTRACT:
A high-frequency heating device includes an AC power source, a high-tension transformer, a triac thyristor connected between the primary winding of the high-tension transformer and the power source, a magnetron coupled to the secondary winding of the high-tension transformer, a signal generating circuit for generating upon energization a signal at a predetermined phase of each cycle of the power source voltage, an astable multivibrator for generating pulses whose pulse width is variable, and a control circuit for generating an output signal upon receipt of both an output pulse of the astable multivibrator and output of the signal generating circuit to control the triac thyristor in an ON-OFF fashion.

REFERENCES:
patent: 3510686 (1970-05-01), Zug
patent: 3735237 (1973-05-01), Derby
patent: 3780252 (1973-12-01), Crapuchettes
patent: 3793531 (1974-02-01), Ferrigno

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