PTC heaters are typical direct thermal step positive temperature coefficient thermistors. 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 ambient temperature can be obtained by the current flowing through the thermistor, or by the external input heat energy 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.
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