Proximity switch for detecting a magnetic inductive field

Details Proximity switch for detecting a magnetic inductive field Proximity switch for detecting a magnetic inductive field

1989-01-17

1991-02-19

Snow, Walter E.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

32420726, 324236, 307116, 331 65, G01B 714, H01H 3500, H01H 8300, G01N 2700

Patent

active

049947389

ABSTRACT:
An inductive proximity switch comprises a high-frequency oscillator, an oscillator coil and an oscillator core. An analyzing circuit detects the inclination amplitude depending on the degree of core saturation. The analyzing circuit triggers a switching process when a certain threshold value of amplitude is reached. The core consists, for example, of ferrite. A yoke-like body is assigned to the core. The use of such a soft-magnetic material for the yoke-like body, allows the construction of smaller sensors with a higher sensitivity and a more cost-advantageous production. Their permeability curve in relation with one quadrant of the coordinate system is clearaly S-shaped.

REFERENCES:
patent: 3271204 (1966-09-01), Glass
patent: 4587486 (1986-05-01), Soyck
patent: 4618823 (1986-10-01), Dahlheimer et al.
patent: 4678994 (1987-07-01), Davies

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