RF Induction heating circuits for float zone refining of semicon

Details RF Induction heating circuits for float zone refining of semicon RF Induction heating circuits for float zone refining of semicon

1978-04-13

1980-09-02

Bernstein, Hiram H.

Chemical apparatus and process disinfecting, deodorizing, preser

Physical type apparatus

Crystallizer

331169, B01J 1710

Patent

active

042206260

ABSTRACT:
Apparatus for zone refining rods of semiconductive material is disclosed including an RF induction work coil having a single turn lying in a plane generally transverse to the lengthwise axis of the rod and encircling the rod. The coil is part of an RF power oscillator circuit including a power amplifying device (e.g. a vacuum tube) having a control electrode and a power output electrode, the latter being connected through a voltage-blocking capacitance to an input node of an inductive-capacitive tank circuit. The tank circuit includes the work coil and a capacitance. One input side of the work coil is connected in a circuit to the input node capacitance being connected between the input node and the other input side of the work coil. A grounded center tap of the coil serves as a ground node of the tank circuit.
The disclosure includes a circuit arrangement for supplying a signal of preselected magnitude to the control electrode for forcing the amplifying device toward desirable operating conditions.

REFERENCES:
patent: 2748241 (1956-05-01), Mohr
patent: 3177336 (1965-04-01), Fisher
patent: 3270177 (1966-08-01), Prediger
patent: 3275419 (1966-09-01), Spielmann
patent: 3644151 (1972-02-01), Keller
patent: 3862348 (1975-01-01), Keller

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