The main function of the thermistor

　　Thermistor

　　Thermistor is a type of sensitive element, which is divided into positive temperature coefficient thermistor (PTC) and negative temperature coefficient thermistor (NTC) according to different temperature coefficients. A typical characteristic of thermistors is that they are sensitive to temperature and exhibit different resistance values at different temperatures. The positive temperature coefficient thermistor (PTC) has a larger resistance value when the temperature is higher, and the negative temperature coefficient thermistor (NTC) has a lower resistance value when the temperature is higher. They are both semiconductor devices.

　　What is the main function of the thermistor?

　　Thermistors include positive temperature coefficient (PTC) and negative temperature coefficient (NTC) thermistors. As the temperature gradually increases, the resistance of the thermistor will gradually increase, and when the temperature gradually decreases, the resistance will decrease accordingly; as a sensor for measuring temperature.

　　The main features of the thermistor are:

　　① The sensitivity is high, and its temperature coefficient of resistance is more than 10 to 100 times larger than that of metal;

　　② Wide operating temperature range, normal temperature devices are suitable for -55℃～315℃, high temperature devices are suitable for temperatures higher than 315℃ (currently up to 2000℃) low temperature devices are suitable for -273℃～55℃;

　　③Small size, able to measure the temperature of voids, cavities and blood vessels in living organisms that cannot be measured by other thermometers;

　　④Easy to use, the resistance value can be arbitrarily selected between 0.1 ~ 100kΩ;

　　⑤It is easy to process into complex shapes and can be mass-produced;

　　⑥ Good stability and strong overload capacity.

　　Due to the unique properties of semiconductor thermistors, it can not only be used as a measuring element (such as measuring temperature, flow, liquid level, etc.), but also as a control element (such as thermal switches, current limiters) and circuit compensation. element. Thermistors are widely used in household appliances, electric power industry, communications, military science, aerospace and other fields, and the development prospects are extremely broad.

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