Inductive proximity switch temperature compensation circuit

By introducing a temperature compensation circuit into the inductive proximity switch and using an NTC thermistor to generate a temperature-related compensation voltage, the problem of detection distance drift of the inductive proximity switch when the temperature changes is solved, achieving a high-precision and low-cost temperature compensation effect, and improving detection reliability and production efficiency.

CN224653491UActive Publication Date: 2026-08-18XINWEITE (SHANGHAI) INFORMATION TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202521933610.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-09-09
Publication Date
2026-08-18
Estimated Expiration
2035-09-09

AI Technical Summary

Technical Problem

Existing inductive proximity switches experience distance drift when the temperature changes, leading to decreased detection reliability. Furthermore, existing solutions are either costly or have complex manufacturing processes, and cannot effectively solve the temperature drift problem.

Method used

By introducing a temperature compensation circuit, a resistor network is constructed using an NTC thermistor to generate a compensation voltage that has a specific functional relationship with temperature, actively offsetting the oscillation amplitude drift caused by temperature changes and maintaining a constant detection threshold.

Benefits of technology

It achieves high-precision, low-cost temperature compensation, with a detection distance drift of less than ±5%, improving detection accuracy and long-term reliability, simplifying the manufacturing process, and is suitable for various inductive proximity switch topologies.

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Abstract

The inductive proximity switch temperature compensation circuit comprises an LC oscillation circuit, a power supply circuit, a rectifier filter circuit, a signal detection and processing circuit and a temperature compensation circuit; the LC oscillation circuit, the power supply circuit, the rectifier filter circuit, the signal detection and processing circuit and the temperature compensation circuit are installed in a shell; the signal output end of the LC oscillation circuit and the signal input end of the rectifier filter circuit are connected through a wire; the signal output ends of the temperature compensation circuit and the rectifier filter circuit and the signal input end of the signal detection and processing circuit are respectively connected through wires; and the power output end of the signal detection and processing circuit and the power input end of the relay are connected through a wire. The novel inductive proximity switch temperature compensation circuit can actively inject a compensation voltage with a specific function relationship with temperature into a later-stage signal processing circuit, and use the compensation signal to counteract the drift of the oscillation amplitude caused by temperature change, so as to stabilize the detection threshold at a constant level, thereby providing favorable technical support for stable operation of the inductive proximity switch.
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