在点烟器内部正极串联一支
PPTC
自恢复保险丝
，当后面设备有短路，或者前端有异常电流变化时，PPTC很快就从低阻变成高阻，电流不再通过，使后面的电路不再工作，从而达到了保护的目的。
插在汽车点烟器电源插口的连接器通常包括移动电话、未来的免提设备、其他电池供电设备的充电电路。诸如PPTC元件的典型的过流保护结合了充电输入的过电压保护功能,将有助于设备满足严格的电气要求。一个PPTC元件便能用于抵御过电流和过电压故障所产生的损害。(推荐阅读：
jdtfuse在便携电动工具充电器的保护应用
)
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