Ntc Thermistor Function

An ntc is commonly used as a temperature sensor or in series with a circuit as an inrush current limiter. Ntc thermistors are non linear resistors which alter their resistance characteristics with temperature.

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The major problem ntc thermistor is the calibration that is to establish a function between electrical resistance and temperature.

Ntc thermistor function. The resistance remains constant up to a certain temperature and suddenly increases at a certain critical temperature. For overheat sensing overcurrent protection inrush current suppression and heater. The manner in which the resistance decreases is related to a constant known in the electronics industry as beta or ss.

There are also thermistors that have positive temperature coefficient ptc for short which means as the temperature increases the resistance increases. This is a property of a negative temperature coefficient resistor ntc for short. The resistance of ntc will decrease as the temperature increases.

This makes the ptc thermistor a little harder to interface with. During charging the ntc thermistor repeatedly measures the temperature all 5 to 10 seconds and can detect a rise in the battery. With ntc thermistors resistance decreases as temperature rises.

Ntc thermistors are the most commonly used especially the 10kw ntc thermistor and along with an addition series resistor r s can be used as part of a simple potential divider circuit. They are primarily used as resistive temperature sensors and current limiting devices. Ntc thermistors are resistors with a negative temperature coefficient which means that the resistance decreases with increasing temperature.

However ptc thermistors have a sort of tipping point and greatly change the resistance at some temperature. The ntc thermistor is part of a smart charging control unit see figure 10 which assures that the ambient temperature is in the range allowing quick charging. Thus changes to its resistance due to changes in temperature produces a temperature related output voltage.

The variation in its electrical resistance with temperature is non linear it may be seen as an exponential function according to equation steinhart hart. An ntc is commonly used as a temperature sensor or in series with a circuit as an inrush current limiter.

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