H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/4, 148/1.8
H05B 6/30 (2006.01) B01D 17/09 (2006.01) B23K 26/00 (2006.01) C30B 13/00 (2006.01)
Patent
CA 1104214
ABSTRACT OF THE DISCLOSURE 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 sign? of preselected magnitude to the control electrode for forc , the amplifying ?ice toward desirable operating conditions. - 1 -
288568
Fricke Louis H.
Gregory Robert O.
Mcfadden Fincham
Monsanto Company
LandOfFree
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