PTC thermistors and PTC heaters are very common in everyone's daily life. PTC thermistors and PTC heaters seem very similar at first glance, and they seem to have similar functions. However, in principle, the difference between PTC thermistor and PTC heater is very significant. Today we are going to discuss the difference between PTC thermistor and PTC heater.
First, you need to figure out a definition: PTC thermistor is also called a self-repairing fuse. The principle of PTC thermistor is completely different from the basic principle of PTC heater.
The principle of PTC thermistor: PTC thermistor (positive temperature coefficient thermistor is a self-repairing fuse) is a temperature-sensitive semiconductor material resistor, once it exceeds a certain temperature (Curie temperature), The resistance value is basically gradual with the increase in temperature.
The temperature transition of the PTC thermistor body can be obtained according to the amount of current passing through the PTC thermistor, or according to the external heat input or the accumulation of the two.
Principle of PTC heater: The PTC heater uses PTCR thermal porcelain components, which is composed of several sheet-type polymer materials and high-temperature adhesives bonded with wave-shaped heat-removing aluminum tape.
It has obvious advantages of low temperature resistance and low heat exchanger high efficiency. Its greater characteristics depend on its safety factor. When the cooling fan is blocked, the PTC heater will not be completely worn out, and the switching power supply will drop sharply.
The surface temperature of the electric heater will remain limited to the Curie temperature (usually 220°C) to prevent the "redness" of the surface of the heating tube electric heater and eliminate safety hazards.
In that way, do you have a clear understanding of the principle of PTC thermistor and PTC heater and the difference between PTC thermistor and PTC heater?