Patent
Noncontact electronic switching arrangement
Heinz Walker,Hans-Dieter Riedel +1 more
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TLDR
In this paper, a noncontact electronic switching arrangement is provided with an oscillator which can be damped by external objects, such as a reference voltage comparator at the output of the oscillator, delivering 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.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.read more
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References
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