Noncontact electronic switching arrangement

Details Noncontact electronic switching arrangement Noncontact electronic switching arrangement

1986-10-21

1988-12-20

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307308, 331 65, G01N 2700, G08B 1316

Patent

active

047927640

ABSTRACT:
A noncontact electronic switching arrangement is provided with an oscillator which can be damped by external objects. In accordance with the invention, the oscillator can be excited externally and is coupled to an evaluation circuit and an amplifier. A frequency control, which may consist of a phase-locked loop module, is connected to the externally excited resonant circuit of the oscillator. A reference voltage comparator at the output of the oscillator delivers at a Schmitt trigger output, pulse signals to a retriggerable time delay stage, or a shift register, which are connected to an exclusive-OR stage. The functioning of the exclusive-OR stage can be programmed. The arrangement is particularly useful as a limit or end switch for machine tools.

REFERENCES:
patent: 3747012 (1973-07-01), Buck
patent: 4016453 (1977-04-01), Moenning
patent: 4081700 (1978-03-01), Hamilton, II
patent: 4135124 (1979-01-01), Buck
patent: 4328433 (1982-05-01), Nodera et al.
patent: 4430636 (1984-02-01), Bruce
H. J. Krimmling and H. Walker, Bero Proximity Switches of IC Design, Siemens Review, vol. 42, No. 10, pp. 453-456, Oct. 1975.
"Theorie und Anwendugen des Phase-Locked Loops" by von Roland Best, Jun. 1975; pp. EL 9-15.

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