In-depth analysis of NTC thermistors.Infrared IC Processing

　　NTC thermistor is a kind of resistance sensor, which has the characteristics of large temperature coefficient of resistance, light weight, small thermal inertia, stable and reliable, low price, simple structure, etc., making it widely used in home air conditioners, automobile air conditioners, freezers, Refrigerator and other occasions requiring temperature measurement and control. However, NTC thermistor is a nonlinear element, and it has self-heating effect. It is necessary to design a temperature measurement system to overcome these two defects. The methods commonly used to solve the nonlinearity of NTC thermistors include empirical formula method, least square fitting method, hardware circuit compensation method and constant source method combined with software look-up table method. Not high enough. The least squares method needs to be performed under the condition of obtaining a large amount of experimental data, the workload is large, and the memory is also large. The hardware circuit compensation method has higher requirements for electronic components, and with the increase of the complexity of the circuit, it also brings additional circuit errors. The constant source method combined with the software look-up table method needs to occupy a large storage space. In view of the shortcomings of the above methods, a third-order logarithmic formula piecewise curve fitting method is proposed. Since it is used in marine diesel engines, not only the temperature but also the oil pressure needs to be measured, so the pressure and temperature are combined into one. The small paper on the sensor, the NTC thermistor is used to measure the temperature. The hardware part discusses the common ground and non-common ground of the NTC thermistor and the binning test. Combine and use sliding filtering algorithm to reduce the error caused by A/D sampling.

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