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暖手宝的原理

更新时间: 2020-10-19 00:00:00     

暖手宝的原理:

采用双控温电热储能式结构,逐渐释放热量,内设自动过热保护装置,以及自动保暖指示装置,一个由PTC热敏电阻开关控制的小电炉,PTC温度系数的热敏电阻,当电流通过时自身就会发热,电炉的热量传递给它,当温度达到一定值,它的电阻会急剧上升,直到断开电源。所以此时,热宝已经停止消耗电能了,靠保温棉对电炉的保温来缓慢放热。

关键词: 原理

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