What are the applications of NTC negative temperature coefficient thermistors?

　　NTC thermistor is a thermistor with a negative temperature coefficient. This resistance value characteristic is realized as a decrease with the increase of temperature. The material it uses is a semiconductor material with a large negative temperature coefficient. This kind of resistance is widely used in switching power supply, UPS power supply, electronic ballast, temperature sensor, automatic adjustment heater and other occasions. The following describes the three functions of the thermistor in surge absorption, temperature measurement, and temperature compensation.

　　1. Suppress surge current

　　This type of thermistor belongs to the power type. Although the size is small, the power is very large. Generally, it is connected in series with the mains input line. It has a rated zero-power resistance value. Generally, this resistance value is very small. The most basic parameters of resistors are generally given by manufacturers. When connected in series in the power loop, the power-on inrush current can be effectively suppressed, and the power it consumes is almost negligible.

　　Features of power thermistor:

　　①Small size and high power

　　②Strong ability to suppress surge current and fast response

　　③The material constant (B value) is large

　　④Long life, high reliability and wide working range

　　Power type thermistor specific circuit connection

　　2. Use a temperature sensor to measure the temperature

　　As a thermistor for measuring temperature, it uses the change of the resistance value of the external temperature change, because the NTC resistance always passes a certain amount of current when it is connected to the circuit, this current will cause the NTC itself to generate heat, and the resistance value of the NTC will decrease. It has a great influence on the measurement, so it is necessary to control the self-heating to avoid the measurement error caused by the self-heating of the component caused by the excessive current flowing through the thermistor. Write all or part of the resistance value corresponding to the temperature into the CPU, so that when the external temperature changes, the resistance value changes, which is realized as a voltage change. This package includes chip type, epoxy head type, glass sealing type, straw hat type, etc.

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