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Inductive proximity switches with pre-damping elements

A technology of damping elements and proximity switches, which is applied in the field of pre-damping elements and can solve problems such as pollution

Active Publication Date: 2022-04-22
IMF ELECTRONIC GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The disadvantage is that this also presents a risk of contamination during removal of the resistive material, considering that the resistor can only be tuned once during the manufacturing process by opening the device

Method used

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  • Inductive proximity switches with pre-damping elements
  • Inductive proximity switches with pre-damping elements
  • Inductive proximity switches with pre-damping elements

Examples

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Embodiment Construction

[0020] figure 1 Shows the basic components of an inductive proximity switch. The sensor coil 1 together with the capacitor C forms a resonant circuit which is fed, ie undamped, by the oscillator circuit 4 acting as a negative resistance. The figure shows a current mirror circuit which does not require a coil tap and which provides adjustment selection through a resistor RA (here electronic potentiometer 7 ) at the lower current mirror. The upper current mirror is used for feedback. Additional details are disclosed in DE19650793C1.

[0021] The oscillator circuit 4 and the evaluation circuit 5 are jointly accommodated in an application-specific integrated circuit (ASIC), without limiting the invention to this. The ASIC 8 also includes a control module comprising threshold switches (flip-flops) as shown and a logic device, such as a microcontroller.

[0022] The evaluation circuit 5 controls the oscillator circuit 4 , here its amplitude, via an electronic potentiometer 7 or ...

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Abstract

The invention relates to an inductive proximity switch comprising at least one sensor coil (1) for generating an alternating magnetic field in order to detect conductive objects in a monitoring area; and comprising a pre-damping element (2) which is jointly arranged on a circuit board (3) , and comprising an oscillator circuit (4) for feeding the sensor coil (1) and an evaluation circuit (5) for generating a binary switching signal, wherein the pre-damping element (2) has a ring in at least one position is interrupted and has a connection for adjusting the impedance of the loop, which is connected to the evaluation circuit.

Description

technical field [0001] The invention relates to a non-contact operating inductive proximity switch comprising a pre-damping element according to the preamble of claim 1 . Background technique [0002] Inductive proximity switches that operate without contact are used as electronic switching devices, especially in automation technology. They have been known for a long time and are especially manufactured and distributed by the applicant. [0003] The inductive proximity switch detects a conductive, preferably metallic object in the monitoring area. They comprise at least one sensor coil and can be operated by current pulses or by a continuous, usually sinusoidal, alternating current. The coil can be part of an oscillator and determines its frequency. However, the transmission coil can also be powered by a generator with pulsed or sinusoidal current. The sensor can also be configured as a transformer, for example as a differential transformer and thus also include a transm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/95
CPCH03K17/9505H03K17/9532H03K2017/9527H03K2217/95
Inventor 马库斯·普赖格约阿希姆·迈尔黑里贝特·霍斯
Owner IMF ELECTRONIC GMBH
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