Oscillation circuit for proximity switch

Details Oscillation circuit for proximity switch Oscillation circuit for proximity switch

1989-11-22

1990-11-06

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

32420716, 324236, 361180, 331117R, G01V 311, H03B 512

Patent

active

049689533

ABSTRACT:
An oscillation circuit of a proximity switch includes a parallel LC resonance circuit (L, C), an oscillation transistor (Tr6) controlled by an output voltage from the resonance circuit for switching a constant current and a feedback circuit (Tr2, Tr3) for feeding back a current flowing through the oscillation transistor to the resonance circuit. In the circuit, there is further disposed a feedback current increase circuit including a second transistor (Tr7) controlled by an output voltage from the resonance circuit and a resistor (R) connected in series to the second transistor. The resonance circuit is supplied via the feedback circuit with a feedback current obtained by adding a current flowing through the feedback current increase circuit and a current passing through the oscillation transistor, thereby developing a large change in the amplitude of the oscillation.

REFERENCES:
patent: 4761603 (1988-08-01), Nodera

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