operating principle
The thermistor will remain inactive for a long time; When the ambient temperature and current are in the c zone, the heat dissipation power of the thermistor is close to the heat generating power, so it may or may not operate. When the ambient temperature is the same, the operation time of thermistor decreases sharply with the increase of current. The thermistor has shorter operating time and smaller maintenance current and operating current when the ambient temperature is relatively high.
1, ptc effect is a material with ptc (posiTIve The temperature coefficient effect, or positive temperature coefficient effect, simply means that the resistance of the material increases with increasing temperature. For example, most metal materials have ptc effect. In these materials, the ptc effect appears as a linear increase in resistance with increasing temperature, which is commonly referred to as the linear ptc effect.
2, nonlinear ptc effect After the phase change of the material will show resistance along the narrow temperature range of several to more than a dozen orders of magnitude phenomenon, that is, the nonlinear ptc effect, quite a variety of types of conductive polymers will show this effect, such as polymer ptc thermistor. These conductive polymers are useful for making overcurrent protection devices.
3, polymer ptc thermistor for overcurrent protection polymer ptc thermistor is often called self-recovery fuse (hereinafter referred to as thermistor), because of its unique positive temperature coefficient resistance characteristics, so it is extremely suitable for use as overcurrent protection devices. The thermistor is used in series in the circuit like an ordinary fuse.
Thermistors are widely used in household appliances, power industry, communications, military science, aerospace and other fields, and the development prospect is extremely broad.