Design of R-type thermocouple interface with cold-junction compensator and its broken wire detection

냉점보상과 단선감지 기능을 갖는 R-형 열전쌍 인터페이스 설계

  • 차형우 (청주대학교 전자정보공학부) ;
  • 김영선 (청주대학교 전자정보공학부) ;
  • 박소현 (청주대학교 전자정보공학부) ;
  • 현필수 (청주대학교 전자정보공학부) ;
  • 김대한 ((주)토마스엔지니어링) ;
  • 윤영식 ((주)토마스엔지니어링) ;
  • 유호영 ((주)토마스엔지니어링) ;
  • 김병조 (윈테크(주))
  • Published : 2006.06.21

Abstract

R-type thermocouple(TC) interface circuits with cold-junction compensator(CJC) and its broken wires detection was developed. The circuit consists of a CJC device, a instrumentation amplifier(IA), and two resistor and a diode for broken wire detection. The experiment results show that the interface circuit has a good CJC function on the temperature range for $20^{\circ}C$ to $1400^{\circ}C$. At the range the output voltage of the IA was -14V when the TC was broken. At normal operation condition the output voltage of IA was 0V to 10V for the temperature range.

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