The principle of NTC thermistor.Radar Microwave Induction Sensor Switch

　　NTC thermistors are generally made of metal oxides such as manganese, cobalt, nickel and copper as the main materials, and are manufactured by ceramic technology. These metal oxides are completely similar to semiconductor materials such as germanium and silicon in their electrical conductivity. When the temperature is low, the number of carriers (electrons and holes) of these oxide materials is small, and its resistance is high; when the temperature is high, the number of carriers (electrons and holes) of the oxide material is large, and its resistance is low.

　　Application of NTC Thermistor in Vehicle Thermal Management System

　　In automotive thermal management systems, NTC thermistors are commonly used as temperature measurement tools on the air side and medium side, such as evaporator temperature sensors, refrigerant temperature sensors, cab temperature sensors, and coolant temperature sensors.

　　R25: The resistance value of the NTC body at 25°C.

　　B value: material constant, which is a parameter used to express the range of resistance of NTC with temperature in the working temperature range, which is related to the composition of the material and the sintering process. In addition, the B value of NTC will be affected by temperature changes, so we usually select two temperature points on the curve to calculate. When indicating the B value, the selected temperature point should be marked (if there is no note, the default is B25/50), such as B25/85. The larger the B value, the faster the resistance changes with temperature, the smaller the value, the opposite.

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