Automatically stabilized oscillator

Details Automatically stabilized oscillator Automatically stabilized oscillator

1977-04-25

1978-09-05

Kominski, John

Oscillators

Solid state active element oscillator

Transistors

219 1055R, 331117R, H03B 302

Patent

active

041123930

ABSTRACT:
An induction heating generator consists of a Hartley oscillator employing a tank circuit, including the induction heating coil, disposed in series with the emitter-collector circuit of the transistor. A bias circuit consisting of the parallel combination of a capacitor and diode is connected to the base and the feed-back voltage to the base is generated by a tickler coil. In the absence of oscillations the base is biased for class A operation and the resulting feed-back current charges the bias circuit to shift the operating point to class C operation. The bias voltage is decreased when the tank coil is loaded, lowering its impedance. This maintains stable operation of the oscillator independent of variations in the load. When the coupling between the load and the inductor is so great as to overload the oscillator, the bias circuit prevents oscillation.

REFERENCES:
patent: 3064177 (1962-11-01), Bender
patent: 3218574 (1965-11-01), Racy et al.
patent: 3292104 (1966-12-01), Kitchin
patent: 3775702 (1973-11-01), Wallace

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