PTC is the abbreviation of Positive Temperature Coefficient, which means positive temperature coefficient, which generally refers to semiconductor materials or components with a large positive temperature coefficient. Usually the PTC we mentioned refers to the positive temperature coefficient thermistor, referred to as the PTC thermistor. The PTC thermistor is a typical semiconductor resistor with temperature sensitivity. When it exceeds a certain temperature (Curie temperature), its resistance The value increases in a stepwise manner with increasing temperature.
The ptc heater is a typical direct thermal step positive temperature coefficient thermistor. When the ambient temperature rises above the Curie temperature, the resistance value increases step by step, up to 4 to 10 orders of magnitude. The change of the ambient temperature can be obtained by the current flowing through the thermistor, or by the external heat input or the superposition of the two. Based on the above characteristics, PTC can be used for overcurrent protection, overheating protection, temperature measurement, temperature compensation, delayed start, degaussing, etc. in the circuit.
PTC electric heating device refers to a positive temperature coefficient. The meaning of negative temperature coefficient is that the mutant PTC thermistor is subdivided into two categories. The PTC effect is formed by mixing carbon black with polyethylene polymer materials.