Temperature/voltage conversion circuit of thermistor

Published:2011/7/5 7:57:00 Author:Lucas | Keyword: Temperature/voltage conversion, thermistor | From:SeekIC

In the circuit shown in Figure 1-52 (a), Rl and thermistor RT are connected in parallel, and its role is to improve the linear relationship between the thermal resistor and temperature changing. RT and R1-R5 form a bridge with the bridge arm resistance in lOkΩ. Adjusting RP1 could keep the bridge balance, so that the output voltage is equal to zero at the required temperature. Output voltage U. is decided by the thermistor constant B and the voltage applied on bridge. Figure 1-52 (b) shows the circuit with the output voltage sensitivity in 1OmV / ℃, temperature measurement range in -50 +15 O ℃. When the bridge is added +5 V reference voltage U (REF), the thermistor RT will flow a constant current.



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