Electric heating – Metal heating – Of cylinders
Patent
1987-07-02
1989-01-17
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 85, 219 1077, H05B 606
Patent
active
047989254
ABSTRACT:
A method of measuring an effective heating power applied to a workpiece at a position to be heated by a high frequency heating apparatus having a source of high frequency AC power connected to a resonant circuits having a supply of high frequency AC power from the source for applying a high frequency AC power to the workpiece. An effective power P.sub.HF for the power supplied to the resonance circuit is measured. An effective value I.sub.t for the current sensed in the resonance circuit is measured. A power loss W produced in components following the source is calculated as a function of the measured effective value I.sub.t. The effective heating power Pw is calculated as Pw=P.sub.HF -W. In another aspect of the invention, the calculated effective heating power Pw is compared with a target value. The power to the resonance circuit is controlled in a direction zeroing the difference between the calculated effective heating power and the target value.
REFERENCES:
patent: 3573416 (1971-04-01), Drechsler
patent: 3743808 (1973-07-01), Kasper
patent: 4280038 (1981-07-01), Hauas et al.
patent: 4447698 (1984-05-01), Van Sikle et al.
patent: 4456803 (1984-06-01), Kaneda et al.
patent: 4634830 (1987-01-01), Furudate
Kabushiki Kaisha Meidensha
Leung Philip H.
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