Inrush Current Limiter NTC Thermistor

A.All kinds of power supply,UPS power supply, Switching power supply

B.Inrush current limiter NTC thermistor EV charger,charging pile

C.Motor driver,superpower server motor driver,logic controller

D.High power plasma electic welder,cutting machine, super power lighting lamp

E.Nuclear magnetic resonance equipment,super power audio power amplifier,high power circle transformer

F.The solar panel arrays wiht high capacity power inverter

G.The industrial robot drived by high voltage power supply,intelligent electric cabinet with low voltage

A. Power type negative temperature coefficient thermistor

B.Inrush current limiter NTC thermistor Power thermistor

C. Limit inrush current type negative temperature coefficient thermistor

D. Power protection NTC

How does the power type NTC thermistor suppress the surge current?

The working principle is: when the power switch is turned on, the NTC thermistor is in a cold state, and the resistance value is large, which can effectively suppress the surge pulse current flowing through the resistor body. Under the dual effects of the surge pulse current and the working current, the NTC thermistor The temperature of the thermistor will rise, and due to its own negative temperature coefficient characteristics, the resistance value will drop sharply as the temperature rises. Under the steady state load current, its resistance value will be very small, only about 1/20~1/50 of that under the cold state, the limiting effect on the current will be small, the power consumption will be very small, and it will not affect the whole power supply s efficiency. Therefore, the use of power NTC thermistors in the power circuit is the easiest and most effective measure to suppress the startup surge current and protect electronic equipment from damage. MF72 and MF73 series NTC thermistors are used in surge suppression.

When household appliances, chargers, etc. are turned on and powered on, an instantaneous surge current will be generated. Inrush current can cause damage to circuit breakers, failure of protection devices, and malfunction of equipment. Connecting a power NTC thermistor in series in the power circuit can effectively suppress the surge current at startup and protect electrical circuits and other electronic components. As a key protection component in the power circuit, the reliability and safety of the power NTC thermistor itself is particularly important.

Electrical equipment such as motors, transformers, switching power supplies, electric heaters, and incandescent lamps will generate a surge current that is many times higher than the normal operating current at the moment of starting up. The resistance value is used to suppress the surge current at the moment of starting up, so that the surge current at the moment of starting up will not be too large, so that the components in the electrical appliance are protected, and the working life of the above-mentioned electrical equipment can be greatly extended.

1. Zero power resistance value;
2. B constant;
3. Dissipation coefficient
4. Thermal time constant;
5. Withstand voltage;
6. Rated power;
7. Impulse capacitance;
8. Steady state current.

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