| 摘要 |
A fan includes an interface connected to a motherboard, a fan motor, a battery, a switch connected to the battery, and a controller connected to the interface, the fan motor, the switch, and the battery. The controller includes a storage unit to store a preset timing value, a timer to count a working time of the fan motor after the motherboard is powered off, and a control unit. When the motherboard is powered on, the control unit receives a voltage from the motherboard and outputs the voltage to the fan motor. When the motherboard is powered off, the control unit controls the switch to be turned on. The battery provides a voltage to the fan motor. The control unit controls the switch to be turned off when a working time of the fan motor reaches the preset timing value. |
