Design of Cold-Junction Compensation and Disconnection Detection Circuits of Various Thermocouples and Implementation of Multi-Channel Interfaces Using Them-A Secondary Publication

作     者：Hyeong-Woo Cha 

作者机构：Department of Electronic EngineeringCheongju UniversityKorea 

出 版 物：《Journal of Electronic Research and Application》 (电子研究与应用)

年 卷 期：2024年第8卷第1期

页      面：93-105页

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：R-type thermocouple(TC) Cold-junction compensation(CJC) TC disconnection detection Multi-channel interface circuit Sensor interface 

摘      要：Cold-junction compensation(CJC)and disconnection detection circuit design of various thermocouples(TC)and multi-channel TC interface circuits were *** CJC and disconnection detection circuit consists of a CJC semiconductor device,an instrumentation amplifier(IA),two resistors,and a diode for disconnection *** on the basic circuit,a multi-channel interface circuit was also *** CJC was implemented using compensation semiconductor and IA,and disconnection detection was detected by using two resistors and a diode so that IA input voltage became-0.42 *** a result of the experiment using R-type TC,the error of the designed circuit was reduced from 0.14 mV to 3μV after CJC in the temperature range of 0°C to 1400°*** addition,it was confirmed that the output voltage of IA was saturated from 88 mV to-14.2 V when TC was disconnected from *** output voltage of the designed circuit was 0 V to 10 V in the temperature range of 0°C to 1400°*** results of the 4-channel interface experiment using R-type TC were almost identical to the CJC and disconnection detection results for each *** implemented multi-channel interface has a feature that can be applied equally to E,J,K,T,R,and S-type TCs by changing the terminals of CJC semiconductor devices and adjusting the IA gain.