PTC heater is a kind of electric heater based on semiconductor material, and its working principle is to utilize the positive temperature coefficient property of PTC material for heating. When energized, the PTC material generates a large amount of heat, warming up the surrounding environment. When the temperature rises to a certain level, the resistance value of the PTC material increases sharply, restricting the flow of current to achieve a self-stabilizing state.PTC electric heaters have the advantages of fast response, uniform heating, safety and reliability, and are widely used in home appliances, automotive, medical, military and other fields, as well as in the control of temperature also has a good application prospects.