| 摘要 |
An electronic device includes a power supply, a heat generating module, a detecting module, a switching module presetting a predetermined voltage, and a heat dissipation module. The heat generating module is powered by the power supply to generate heat. The detecting module detects the heat of the heat generating module and generates a control voltage variable with the heat of the heat generating module. The switching module establishes the electrical connection between the power supply and the heat dissipation module when the control voltage is smaller than the predetermined voltage and generates a working voltage variable with the control voltage. The heat dissipation module is powered by the working voltage to dissipate the heat of the heat generating module with different heat dissipation efficiency. The heat dissipation efficiency is variable with the working voltage.
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