Inductive proximity switch

Details Inductive proximity switch Inductive proximity switch

1986-04-01

1987-05-19

Wong, Peter S.

Electricity: power supply or regulation systems

External or operator controlled

Phase controlled switching using electronic tube or a three...

340562, 361181, H02J 312, G08B 1326

Patent

active

046671471

ABSTRACT:
This invention concerns an inductive proximity switch having an oscillator and a resonant circuit which is dampable by outside objects, as well as an electronic switch controllable by the voltage across the resonant circuit. From the signal of the electronic switch a switching hysteresis is derived. A device for changing the frequency, when the resonant circuit is damped, as a function of the signal of the electronic switch allows the adjustment of the hysteresis in such a way that there is essentially no effect on the sensitivity of the oscillator.

REFERENCES:
patent: 3350660 (1967-10-01), Engdahl
patent: 4204160 (1980-05-01), Voll
patent: 4366473 (1982-12-01), Inoue et al.
patent: 4475089 (1984-10-01), Kahnke
patent: 4553040 (1985-11-01), Truper
patent: 4583006 (1986-04-01), Okada et al.
German Publication, Der Electroniker, No. 6, 1975, article "Theorie and Anwendungen des Phase-Locked Loops".

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