中圖分類(lèi)號(hào)： TP274 文獻(xiàn)標(biāo)識(shí)碼： A DOI：10.16157/j.issn.0258-7998.211896 中文引用格式： 王樂(lè)群，文豐,，張凱華. 基于FPGA的高精度S型熱電偶溫度測(cè)量系統(tǒng)設(shè)計(jì)[J].電子技術(shù)應(yīng)用,，2022，48(2)：41-45. 英文引用格式： Wang Lequn,，Wen Feng,，Zhang Kaihua. Design of temperature measuring circuit of S-type thermocouple based on temperature sensor[J]. Application of Electronic Technique，2022,，48(2)：41-45.
Design of temperature measuring circuit of S-type thermocouple based on temperature sensor
Wang Lequn1,，Wen Feng1，2,，Zhang Kaihua1
1.State Key Laboratory of Electronic Testing Technology,，North University of China，Taiyuan 030051,，China,； 2.Key Laboratory of Instrument Science and Dynamic Testing，Ministry of Education,，North University of China,，Taiyuan 030051，China
Abstract： Aiming at the problem that the traditional multi-channel S-type thermocouple temperature measurement system has low measurement accuracy and each channel is quite different, a high-precision S-type thermocouple temperature measurement system based on FPGA is proposed.The system uses FPGA as controller, with modular design, and uses AD590 to perform cold junction compensation for S-type thermocouples.A high-precision ADC is used to convert the collected temperature analog signal into a digital signal and transmit it to the upper computer for display and locates the temperature value through the look-up table method to improve the temperature measurement accuracy.After many tests, it is verified that the temperature acquisition accuracy of this temperature measurement circuit is better than 0.2%F.S. At present, the circuit design has been applied to engineering practice, which provides an effective and reliable means for the design of temperature measuring circuit of S-type thermocouple.
Key words : S-type thermocouple,；FPGA,；cold end compensation；RFI filter circuit,；high precision
