METHOD AND APPARATUS FOR MEASURING RESISTANCE OF SEMICONDUCTOR GAS SENSOR APPLYING VARIABLE CONSTANT CURRENT SOURCE

• Main Authors: AHN JUNG HWAN, CHOI CHEOL, JEONG DONG KEUN, PARK YOUNG JU, JUNG MI HEE, KIM JONG HYUN
• Format: Patent
• Language: English; Korean
• Published: 06.10.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The present invention relates to a method and a device for measuring the resistance of a semiconductor gas sensor using a variable constant current source, comprising: a variable constant current source (I_var) connected in series to a constant voltage source (Vcc) to adjust current; a sensor resistance (R_sensor) of a semiconductor gas sensor connected in series to the variable constant current source (I_var); a parallel resistance (R_parallel) connected in parallel to the sensor resistance (R_sensor); an AD conversion part (ADC) for detecting sensor voltage (V_sensor) at both ends of the sensor resistance (R_sensor) and converting the same into AD; and a microprocessor for measuring the sensor voltage (V_sensor) with the current value of the variable constant current source (I_var) set to a designated value, calculating the value of the sensor resistance (R_sensor) based thereon, and adjusting the current value of the variable constant current source (I_var) to correspond to a section corresponding to the calculated value of the sensor resistance (R_sensor) among preset measured resistance sections. Therefore, provided are a method and a device for measuring the resistance of a semiconductor gas sensor using a variable constant current source, wherein the measurement precision of a gas sensor can be increased. 본 발명은 가변 정전류원을 이용한 반도체형 가스센서의 저항 측정 장치에 관한 것으로, 정전압원(Vcc)과 직렬로 연결되어 전류를 조절하는 가변 정전류원(Ivar); 상기 가변 정전류원(Ivar)과 직렬로 연결되는 반도체형 가스센서의 센서 저항(Rsensor); 상기 센서 저항(Rsensor)에 병렬로 연결되는 병렬 저항(Rparallel); 상기 센서 저항(Rsensor)의 양단에서 센서 전압(Vsensor)을 검출하여 에이디 변환하는 에이디 변환부(ADC); 및 상기 가변 정전류원(Ivar)의 전류 값을 지정된 값으로 설정한 상태에서 센서 전압(Vsensor)을 측정하고, 이에 기초하여 센서 저항(Rsensor) 값을 산출하고, 미리 설정된 측정 저항 구간 중 상기 산출한 센서 저항(Rsensor) 값이 해당하는 구간에 대응하여 상기 가변 정전류원(Ivar)의 전류 값을 조정하는 마이크로프로세서;를 포함한다.