US 12,222,251 B2
Measurement circuit of thin-film temperature sensor
Xiaowei Hou, Ningbo (CN); Yang Lv, Ningbo (CN); Liangguang Zheng, Ningbo (CN); Junjie Guo, Ningbo (CN); Juping Li, Ningbo (CN); and Po Zhang, Ningbo (CN)
Assigned to NINGBO CRRC TIMES TRANSDUCER TECHNOLOGY CO., LTD., Ningbo (CN)
Appl. No. 17/758,373
Filed by NINGBO CRRC TIMES TRANSDUCER TECHNOLOGY CO., LTD., Ningbo (CN)
PCT Filed Jul. 15, 2020, PCT No. PCT/CN2020/102008
§ 371(c)(1), (2) Date Jul. 5, 2022,
PCT Pub. No. WO2021/139128, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 202010009982.6 (CN), filed on Jan. 6, 2020.
Prior Publication US 2023/0026496 A1, Jan. 26, 2023
Int. Cl. G01K 7/21 (2006.01); G01K 7/20 (2006.01)
CPC G01K 7/21 (2013.01) [G01K 7/206 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A measurement circuit of a thin-film temperature sensor, comprising: a first operational amplifier (U1), a second operational amplifier (U2), a potentiometer (R1), a thin-film resistor (Rt), a first resistor (R6), a second resistor (R7), a third resistor (R8), and a fourth resistor (R9), wherein
an out-phase input end and an output end of the first operational amplifier (U1) are both connected to a first end of the thin-film resistor (Rt); a second end of the thin-film resistor (Rt) is connected to a constant current source; a first end of the first resistor (R6) is connected to the output end of the first operational amplifier (U1), and a second end of the first resistor (R6) is connected to an in-phase input end of the first operational amplifier (U1); the second end of the first resistor (R6) is grounded via the second resistor (R7);
an output end of the second operational amplifier (U2) is connected to a first end of the potentiometer (R1); a second end of the potentiometer (R1) is connected to the constant current source and an in-phase input end of the second operational amplifier (U2) respectively; a first end of the third resistor (R8) is connected to the output end of the second operational amplifier (U2), and a second end of the third resistor (R8) is connected to an out-phase input end of the second operational amplifier (U2); the second end of the third resistor (R8) is grounded via the fourth resistor (R9); the voltage value of the second end of the potentiometer (R1) is an output signal.