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Basic Principle?

Huirui macromolecular PTC thermistors are made on the base of polymer added with conductor. Its basic principle is a kind of energy balance. While current passes through PTC thermistors, due to the existence of I2R, heat is generated and the heat will emanate to the air, and heat left makes the temperature of PTC components rise.

In normal working status, the generated heat and the emanated heat can reach a certain balance, and at that moment the temperature and the internal resistance of PTC is low. While the electricity passing through the PTC increases or the increase of ambient temperature is not obvious, the temperature of the PTC increases and the increase of internal resistance is not big. The heat generated and the heat emanated reaches a new balance.

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