High-frequency heating apparatus having a digital-controlled inv

Details High-frequency heating apparatus having a digital-controlled inv High-frequency heating apparatus having a digital-controlled inv

1989-05-26

1990-06-05

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219492, 219 1077, 363 97, 363131, 323283, H05B 668

Patent

active

049316095

ABSTRACT:
A high-frequency heating source supplies a predetermined high-frequency heating power. An AC input is supplied to an inverter circuit. The inverter circuit generates a high-frequency output signal for driving the high-frequency heating source. The inverter circuit comprises a rectifier circuit for rectifying the AC input, and a switching element for switching the DC output supplied from the rectifier circuit. The inverter circuit is controlled by an inverter control circuit. A processor supplies set heating-output data associated with the high-frequency heating power to the inverter control circuit. The inverter control circuit comprises a counter and an on/off signal generator. The counter is set to a on-period in accordance with the set heating-output data, and performs counting operation. The on/off signal generator generates an on/off signal in accordance with a count value of the counter. A driving circuit drives the switching element of the inverter circuit in response to the on/off signal supplied from the inverter control circuit.

REFERENCES:
patent: 4002875 (1977-01-01), Kiuchi et al.
patent: 4308443 (1981-12-01), Tucker et al.
patent: 4453068 (1984-06-01), Tucker et al.
patent: 4507531 (1985-03-01), Teich et al.
patent: 4686340 (1987-08-01), Fukasawa
patent: 4701588 (1987-10-01), Fukasawa
patent: 4724291 (1988-02-01), Inumada
patent: 4777575 (1988-10-01), Yamato et al.
patent: 4825028 (1989-04-01), Smith

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