双恒流源激励的铂电阻测温电路及防护电路设计  

Design of Dual Constant Current Source-excited Temperature Measuring Circuit and Protective Circuit for Pt Resistances

作　　者：孙越 董福广[1] 秦妙华[1] 赵耀旭 李晓斌 聂德顺 SUN Yue;DONG Fuguang;QIN Miaohua;ZHAO Yaoxu;LI Xiaobin;NIE Deshun(Dongfang Electronics Co.,Ltd.,Yantai 264000,China)

机构地区：[1]东方电子股份有限公司,山东烟台264000

出　　处：《电工技术》2024年第17期163-164,167,共3页Electric Engineering

摘　　要：三线制铂电阻是常用的一种温度传感器,具有性能稳定、测温范围广、快速响应等优点,在电力系统中得到了广泛应用,但会受到其他因素的影响,从而在系统中产生附加误差。为避免和减少在实际使用过程中产生的附加误差影响测量精度,基于NSA2862X芯片设计了一种双恒流源激励的铂电阻测温电路。介绍了双恒流源测温电路及参数计算,为满足工业电磁兼容要求设计了抗干扰防护电路、数据传输方式等,最后经过试验验证了该电路的合理性、可靠性及实用性。Three-wire Pt resistance is a commonly used temperature sensor which has the advantages of stable performance,wide measurement range,and fast response.Three-wire Pt resistances have found wide application in power systems,while nevertheless may be affected by disturbing factors and bring about additional errors.To avoid and reduce the impact of additional errors on measurement accuracy in actual use,this work designed a dual constant current source-excited temperature measuring circuit based on the NSA2862X chip and calculated relevant parameters.Apart from the temperature measuring circuit,an anti-interference protection circuit and the data transmission mode were also designed to meet the requirements for industrial electromagnetic compatibility.Finally the rationality,reliability and practicability of the circuit were experimentally verified.

关 键 词：双恒流源 三线制铂电阻 测温电路 NSA2862X 电磁兼容 

分 类 号：TM930[电气工程—电力电子与电力传动]