PTC high-power or high-temperature heaters are more difficult to achieve than traditional electric wire heaters. This is the mutual control disadvantage caused by the strong nonlinear positive temperature coefficient characteristics of PTC itself that can limit temperature and constant temperature.
In addition, the Curie point and operating temperature of practical PTC components cannot be very high; the thermal resistance of some heaters is often not easy to overcome. Therefore, relatively speaking, PTC high-power high-temperature heaters are realized within a certain range by using high Curie point materials, increasing the area of PTC components, reducing thermal resistance and enhancing heat transfer. The weaker the thermal load, the surface of the heater The higher the temperature.
Based on the above reasons, the safety, reliability and manufacturing cost of high-power, high-temperature heaters determine whether they have practical significance. Therefore, PTC heaters have become the best choice for many small electric heating appliances, and present them in some applications Significant advantages such as high-temperature hot air heaters for heaters, clothes dryers, etc. and high-temperature heaters for small heat-load appliances (such as insulation boards, travel irons, beauty appliances, constant temperature electric irons, etc.) -literature. Reports on in-depth research on the application of PTC heaters. Many other low-power, low-temperature PTC heaters have advantages in application that are difficult to match with electric wire heaters.