High frequency heating generator having an improved matching net

Details High frequency heating generator having an improved matching net High frequency heating generator having an improved matching net

1992-01-16

1994-02-15

Leung, Philip H.

Electric heating

Capacitive dielectric heating

With power supply system

21912136, 363 95, 323237, H05B 604

Patent

active

052869415

ABSTRACT:
A high frequency heating generator which includes an electron tube amplifier, the output of which is connected to a resonant circuit that is electromagnetically coupled to a part to be heated, and a controlled frequency oscillator. The oscillator outputs a high frequency signal to the input of the amplifier. It also includes circuitry to measure the phase shift between the current output to the resonant circuit and the voltage at its terminals, and to modify the frequency of the oscillator as a function of this phase shift. The invention can be applied notably to devices for heating by electromagnetic induction, dielectric losses or plasma.

REFERENCES:
patent: 4471196 (1984-09-01), Frank et al.
patent: 4700281 (1987-10-01), Thorn et al.
patent: 4704673 (1987-11-01), Busch
patent: 4755345 (1988-07-01), Baity, Jr. et al.

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