Definition and function of NTC thermistor

　　NTC thermistor

　　NTC thermistor is a negative temperature coefficient resistance (power thermistor), its resistance value decreases with the increase of temperature, widely used in switching power supply, module power supply, temperature sensor, UPS power supply, electronic ballast , Automatic adjustment of heating and other places.

　　NTC thermistor is small in size and high in power. It is mainly used in the power supply circuit to suppress inrush current, and is generally connected in series with the mains input. It has a rated zero-power resistance value, and when connected in series in the power loop, it can effectively suppress power-on inrush current and consume almost negligible power.

　　The role of NTC thermistor

　　The resistance value decreases as the temperature rises and is often used as anti-surge protection. Because in the rectifier filter circuit, in order to avoid the instantaneous surge current caused by the capacitive load charging when the electronic circuit is turned on, it is usually used in the power supply circuit. Connect a power NVT thermistor in series. This can effectively reduce the inrush current at startup, and after the inrush current reduction is completed, due to the continuous action of the passing current, the resistance of the NTC thermistor will drop to a very small value, and the power consumption is very small. Ignored, and will not affect the normal operation of the circuit.

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