High power R.F. induction heating generator

Oscillators – Solid state active element oscillator – Transistors

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Details

219 1075, 331168, 331185, H03B 512, H05B 508

Patent

active

040017257

ABSTRACT:
A high power R.F. induction heating generator for inductively heating a load including a plurality of transistors of the same type series connected in a self-exciting class "C" oscillator configuration, a tank circuit having a tank coil electrically coupled to the output of the transistors, the tank coil having an impedance which matches the output impedance of the transistors and being adapted to be inductively coupled to the load for providing an oscillating R.F. voltage signal thereto, and a feedback transformer including a primary winding and a plurality of secondary windings corresponding in number to the plurality of transistors, the primary winding being coupled to the tank circuit and the secondary windings being uniformly and substantially identically wound over the primary winding and coupled to the bases of their respective transistors to provide input voltages having equal phases and amplitudes to each of the transistors for synchronizing the conduction and non-conduction periods of the transistors for delivering equal shares of the total power to a load.

REFERENCES:
patent: 2888525 (1959-05-01), Eckess et al.
patent: 2926307 (1960-02-01), Ehret
patent: 2953754 (1960-09-01), Roesel, Jr.
patent: 2999984 (1961-09-01), Beck
patent: 3046495 (1962-07-01), Faries et al.
patent: 3210689 (1965-10-01), Burwen
patent: 3441875 (1969-04-01), Shoh

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