摘要
笔记本外接散热器只能固定转速运行，容易造成能量浪费。本文设计了简单的电路，使用热敏电阻作为温度感应器件，通过单片机的AD转换功能实时采集笔记本散热口的温度。利用PWM技术，智能调节风扇转速，从而实现散热器的转速随温度变化，增强散热器的散热效果。
The external radiator of the laptop can only operate under fixed speed, which is not energy-saving. In this paper, a simple circuit was designed to measure the temperature near air outlet of the laptop. The thermistor was used as temperature sensing element and the data was processed by AD conversion by a single microcomputer. The speed of the motor can be adjusted intelligently by PWM technology. In this way, the external radiator can operate adjusted by temperature signal to enhance the cooling effect.
