Generally, the temperature of the processor, power supply and motherboard inside the computer will increase with the use of the computer and the ambient temperature in which the computer is located.A fan must be installed inside the computer to dissipate heat, so as to avoid damaging the components inside the computer due to the temperature increase. Although the heat can be quickly removed when the fan rotates rapidly, the problem of noise can be generated at the same time. For this kind of noise, it is generally to solve this kind of noise problem by using the cooling fan with controllable rotation speed. The computer can adjust the rotation speed of the fan according to its running state, so at low rotation speed, the fan can still dissipate heat without generating too much noise. However, the cooling fan that can control the rotation speed is expensive.Based on the consideration of control cost, this fan is usually excluded from the general computer system. As a result, most computers still use fixed-speed fans as cooling tools, and users have to endure the accompanying noise problems.

Taiwan's San Ju cooling fans manufacturers have proposed a personal computer solution with a controllable cooling fan, which can continuously turn on and off the cooling fan in a predetermined manner to control the average turn-on time of the cooling fan and reduce the noise of the cooling fan.

A personal computer having a controllable heat dissipation fan, the personal computer including a housing; The power supply is arranged in the shell and is used for supplying power to the personal computer; The mainboard is arranged in the shell and is electrically connected with the power supply; The controller is arranged on the mainboard; And a heat dissipation fan which is arranged in the shell and electrically connected with the mainboard, wherein fan blades of the heat dissipation fan rotate at a fixed rotating speed and are used for providing a heat dissipation function for the personal computer. The controller continuously turns on and off the cooling fan in a predetermined manner to control the average turn-on time of the cooling fan and reduce the noise of the cooling fan.