Proximity switch immune to interference fields
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United States of America Patent
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Jun 20, 1989
Grant Date -
N/A
app pub date -
Feb 16, 1988
filing date -
Feb 17, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A proximity switch immune to interference fields includes an oscillator circuit (1) that can be influenced by a permanent magnet, this circuit being damped in the basic condition by a core of a coil (13), which core consists of an amorphous metal, and being undampable by the approach of the permanent magnet. In order to prevent triggering of the proximity switch by a magnetic alternating field, a signal evaluating circuit (2), yielding a switching signal corresponding to the undamped condition of the oscillator circuit (1), and a signal evaluating circuit (8) are connected to the oscillator circuit output (17). The signal evaluating circuit (8) detects an output signal produced by a magnetic alternating field separately as interference and blocks, by way of a blockable holding circuit (5), the switching signal path so long as a magnetic alternating field is present.
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