High-frequency heating apparatus

Details High-frequency heating apparatus High-frequency heating apparatus

1979-04-25

1985-03-19

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055R, H05B 668

Patent

active

045061270

ABSTRACT:
A high-frequency heating apparatus including a heating chamber accommodating an object to be heated and a high-frequency oscillator supplying its high-frequency output into the heating chamber to heat the object by the high-frequency energy. The high-frequency heating apparatus comprises an output change-over device for changing over the level of the high-frequency output of the high-frequency oscillator and a temperature sensing device for sensing the temperature of the object being heated. The output change-over device is actuated to reduce the power level of the high-frequency output of the high-frequency oscillator when the level of the output signal of the temperature sensing device attains a predetermined temperature setting, and thereafter, the high-frequency oscillator supplying the high-frequency output of reduced power level is turned on-off a plurality of times depending on the level of the output signal of the temperature sensing device relative to the temperature setting.

REFERENCES:
patent: 3470942 (1969-10-01), Fukada et al.
patent: 3569656 (1971-03-01), White
patent: 4035787 (1977-07-01), Hornung
patent: 4041267 (1977-08-01), Wechsler
patent: 4130749 (1978-12-01), Tanaka et al.
patent: 4149057 (1979-04-01), Fritts
patent: 4162381 (1979-07-01), Buck
"Automatic Control System for MW Ovens", by Sato et al., from Microwave Power Symposium 1978 Digest, Jun. 1978.

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