High frequency heating apparatus

Details High frequency heating apparatus High frequency heating apparatus

1991-03-25

1993-12-28

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

219 1055R, 219 1055F, 219 1055M, 363 20, 363131, H05B 668

Patent

active

052742083

ABSTRACT:
A high frequency heating apparatus includes a frequency conversion section including a switching element and converting a commercial power supply frequency to high frequency waves by an on-off control of the switching element, a step-up transformer stepping up an alternating output from the frequency conversion section, a rectification circuit connected at a secondary side of the step-up transformer, a magnetron driven by a direct current power from the rectification circuit, an anode current detection circuit detecting an anode current of the magnetron, and a control circuit for controlling an "on" period of the switching element in response to a detection signal from the anode current detection circuit so that the anode current is maintained at a predetermined value, thereby stabilizing a high frequency power produced by the magnetron against different commercial power supplies.

REFERENCES:
patent: 4285143 (1981-01-01), Miura et al.
patent: 4713528 (1987-12-01), Hirata
patent: 4777575 (1988-10-01), Yamato et al.
patent: 4886951 (1989-12-01), Matsumoto et al.
patent: 4888461 (1989-12-01), Takano et al.
patent: 4933830 (1990-06-01), Sato et al.
patent: 4962292 (1990-10-01), Aoki
patent: 5021620 (1991-06-01), Inumada

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