What is the use of NTC in power supply?

NTC thermistors can be used as inrush-current limiting devices in power supply circuits when added in series with the circuit being protected. They present a higher resistance initially, which prevents large currents from flowing at turn-on.

What does a thermistor do in a power supply?

A thermistor is a resistor, and, just like any resistor, it produces heat energy whenever current passes through it. The heat energy causes the NTC thermistor’s resistance to reduce which then indicates a temperature slightly above ambient temperature.

How do you use NTC thermistors for inrush current limiting?

To limit inrush current, an NTC thermistor is placed between the power supply and system (see Figure 1). Upon power on, the NTC thermistor provides high resistance to limit inrush current. As the inrush current drops, the NTC thermistor self-heats and its resistance drops to a low enough value to pass current through.

How is NTC thermistor measured?

As with any resistor, you can use the ohmmeter setting on your multimeter to measure thermistor resistance. The resistance value displayed on your multimeter should correspond to the ambient temperature near the thermistor. The resistance will change in response to temperature change.

What is NTC in battery?

Batteries are often provided with a negative temperature coefficient (NTC) thermistor, which is used to prevent the batteries from being charged at temperatures that are too high or too low.

How do you fix inrush current?

Inrush current can be reduced by increasing the voltage rise time on the load capacitance and slowing down the rate at which the capacitors charge.

What is NTC in SMPS?

NTC thermistors are temperature-dependent resistors that employ special semiconductor ceramics with a negative temperature coefficient (NTC). They have a high resistance at room temperature, and when they are energized, they generate heat by themselves and the resistance falls as their temperature rises.

How do NTC thermistors fail?

Usually, thermistor failure is caused by an open circuit due to mechanical separation between the resistor element and lead material. This can happen as a result of improper handling, thermal mismatch, or heat damage. Another common reason thermistors fail is simply aging.

What is a 10K NTC thermistor?

This is a type of resistor whose resistance varies with change in temperature. These NTC thermistors are made up from the combination of metal oxides which passed through sintering process which gives negative electrical resistance versus temperature (R/T) relationship to it.

What is NTC on BMS?

A negative temperature coefficient (NTC) thermistor presents a non-linear exponential decreasing resistance/temperature characteristic, as shown on Figure 1 and Equations 1 and 2.