A temperature measurement module circuit for universal resistance type temperature sensor input

By designing a temperature measurement module circuit for a general-purpose resistive temperature sensor input, and utilizing a combination of a constant current source and a differential amplifier, the limitations of resistive temperature sensors in intelligent building measurement and control applications and the accuracy deviation issues were resolved, achieving high-precision temperature measurement and a simplified installation process.

CN224719534UActive Publication Date: 2026-09-04SUZHOU ZHIERZHUO DIGITAL TECH CO LTD
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Patent Information

Application Number
CN202522206422.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-10-20
Publication Date
2026-09-04
Estimated Expiration
2035-10-20

AI Technical Summary

Technical Problem

In existing technologies, resistive temperature sensors have problems such as type limitations, measurement accuracy deviations due to connection lines, reduced accuracy, and installation difficulties caused by incompatibility in building intelligent monitoring and control applications.

Method used

Design a general-purpose temperature measurement module circuit for input resistance temperature sensors. A constant current source excites the resistance temperature sensor to generate a voltage value. Through a combination of differential amplifier and switching, it realizes unified access and high-precision temperature measurement of different resistance types of sensors, including PT100, PT1000 and NTC 50k.

Benefits of technology

This achieves high-precision matching between the resistive temperature sensor and the DDC system, simplifies the installation process, improves temperature measurement accuracy and circuit structure simplicity, and reduces costs.

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Abstract

The utility model discloses a general resistance type temperature sensor input's temperature measurement module circuit, including resistance type input interface circuit, constant current source to interface circuit output constant current, the voltage value of temperature value representation is generated at its two ends, and the same phase input end connection of connection in differential amplifier, and the reference power is selected and switches over by change -over switch S1, and is connected to the inverting input end of differential amplifier, and the amplification factor of differential amplifier is converted into different amplification factor by change -over switch S2 and S3 synchronous, and change -over switch S1, S2 and S3 are a group of synchronous change -over switch. Differential amplifier subtracts reference voltage and then amplifies temperature voltage value according to the amplification factor. The circuit of the utility model is suitable for the unified access conditioning of PT100, PT1000 or NTC 50k and other various resistance type temperature sensors through three or more synchronous switch switching technology, and has the advantages of easy temperature measurement starting point and temperature measurement endpoint implementation.
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