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What Is The Principle Of NTC Thermistor? - News

What Is The Principle Of NTC Thermistor?

71 Published by at August 30,2021

The principle of ntc thermistor is that when the power switch is turned on, the NTC thermistor is in a cold state and has a large resistance value, which can effectively suppress the surge pulse current flowing through the resistor body, under the dual action of the surge pulse current and the working current , NTC thermistor temperature will rise, due to its own negative temperature coefficient characteristics, so the temperature rises, the resistance value drops sharply.

 

NTC thermistor can be used in conjunction with the AC line or the DC output of the bridge rectifier to suppress the startup surge current. Its working principle is: when the power switch is turned on, the NTC thermistor is in a cold state and has a large resistance value, which can effectively suppress the surge pulse current flowing through the resistor. Under the dual action of the surge pulse current and the working current, The temperature of NTC thermistor will rise. Because of its own negative temperature coefficient characteristic, the temperature rises and the resistance value drops sharply. Under steady-state load current, its resistance value will be very small, only about 1/20~1/50 in cold state. The current limitation effect will be small, and the power consumption will be very small, which will not affect the entire power supply. s efficiency. Therefore, the constant electronic power NTC thermistor is the simplest and most effective measure to suppress the startup surge current and protect the electronic equipment from damage when used in the same circuit of the power supply. MF72, MF73, MF74 series NTC thermistors are used in suppressing surges.

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