Question

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恒温加热PTC热敏电阻具有恒温发热特性，其原理是PTC热敏电阻加电后自热升温使阻值进入跃变区，恒温加热PTC热敏电阻表面温度将保持恒定值，该温度只与PTC热敏电阻的居里温度和外加电压有关，而与环境温度基本无关。
PTC加热器就是利用恒温加热PTC热敏电阻恒温发热特性设计的加热器件。在中小功率加热场合，PTC加热器具有恒温发热、无明火、热转换率高、受电源电压影响极小、自然寿命长等传统发热元件无法比拟的优势， 在电热器具中的应用越来越受到研发工程师的青睐。
PTC元件的特性就是：当其通电后发热达到一定温度时，其电阻将急剧增加，此时其发热功率将随之急剧下降，几乎停止发热。当一段时间后因散热其温度低于该数值时，电阻又将急剧下降，开始继续发热来维持该温度。也就是说， PTC元件的发热温度是一定的。也就是说用于需要恒温的场所
恒温加热PTC热敏电阻可制作成多种外形结构和不同规格， 常见的有圆片形、长方形、长条形 、圆环以及蜂窝多孔状等。把上述PTC发热元件和金属构件进行组合可以形成各种形式的大功率PTC加热器。

PTC加热元件按传导方式分
(1)以热传导为主的PTC陶瓷加热元件.
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Answer 1

Constant temperature heating PTC thermistor with a constant temperature heat characteristics, and its principle is add electric PTC thermistor self-heating temperature so that after the resistance to enter the jump zone, constant temperature heating PTC thermistor surface temperature will remain constant value, the temperature only with PTC thermistor of the Curie temperature and applied voltage, while the fundamental has nothing to do with the ambient temperature.
PTC heater is to use constant temperature heating PTC thermistor temperature characteristics of the design of heat heater parts. Heating power at small and medium-sized occasions, PTC heater with thermostat fever, no open flame, heat conversion rate, by the supply voltage with minimal impact, natural long life and other traditional heating elements unmatched advantages in the application of electric apparatus in more and more by R & D Engineer of all ages.
PTC characteristics of components is: when its power after the heat reaches a certain temperature, its resistance will rapidly increase, when the heat and steep decline in power will almost stop fever. When after a period of time due to heat its temperature is lower than the value, the resistance again falling sharply, and begin to heat to maintain the temperature. In other words, PTC heating elements are a certain temperature. That is a place for the required temperature
Constant temperature heating PTC thermistor can be made into a variety of shape the structure and different specifications, there is a common wafer-shaped, rectangular, strip, ring and porous, such as cellular. Put the above-mentioned PTC heating elements and metal components can be combined to form various forms of high-power PTC heater.

PTC heating elements by way of sub-conduction
(1) heat conduction-based PTC ceramic heating elements.
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Answer 2

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