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Thermistor application

Source: Industry News Editor: PingShang Click: Release time: 2021-12-17 08:24:13

Theresistance of the thermistor will change with temperature, and can be divided into positive temperature coefficient (RTC) and negative temperature coefficient (NTC); the resistance of RTC increases with temperature and decreases with temperature, while NTC On the contrary; using this feature can not only be made into temperature measurement, temperature compensation and temperature control components, but also can be made into power-type components to suppress the surge current of the circuit. .

The main features of thermistor

①The sensitivity is high, and the temperature coefficient of resistance is 10-100 times larger than that of metal

②Large operating temperature range, room temperature devices are suitable for -55℃~315℃, high temperature devices are suitable for temperatures higher than 315℃, low temperature devices are suitable for -273℃~55℃

③Small size, able to measure places that other thermometers cannot measure

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

⑤Easy to process and mass production

⑥Good stability and strong overload capacity文章配图13

Because the semiconductor thermistor has unique properties, it can be used not only as a measuring element, but also as a control element and circuit compensation element in application. Thermistors are widely used in various fields such as household appliances, electric power industry, communications, military science, aerospace, etc., and their development prospects are extremely broad.

1. Application of NTC thermistor

Microwave power measurement, temperature control, temperature compensation, temperature control, stabilized temperature compensation and power replacement, switching power supply, UPS power supply, various electric heaters, electronic energy-saving lamps, temperature control circuits, power supply circuit protection, color picture tubes, incandescent In the filament protection circuit of lamps and other lighting fixtures.

2. Application of PTC thermistor

Utilizing the basic resistance temperature characteristics, voltage-current characteristics and current-time characteristics of PTC thermistors, PTC thermistors have been widely used in AD electronic equipment, automobiles and household appliances, etc., to automatically degauss and overheat Current protection, constant temperature heating, temperature compensation and delay function.