Multi-mode fan control circuit with delay function, cooling device and electronic equipment

The invention belongs to the electronic field and provides a multi-mode fan control circuit with a delay function, a cooling device and electronic equipment. The multi-mode fan control circuit with the delay function comprises a power detection unit, a switch unit, a linear driving unit and a delay unit, wherein the power detection unit generates a driving signal when the system power reaches a preset value; the switch unit does not start a fan to work when not receiving the driving signal and controls the fan to rotate at a low speed when receiving the driving signal; the linear driving unit linearly controls the rotating speed of the fan according to the system temperature; and the delay unit is stopped in a delayed mode so as to continuously supply power to the fan. According to the multi-mode fan control circuit with the delay function, the cooling device and the electronic equipment, the rotating speed of the fan is controlled to be within three rotating speed ranges when a system is in a no-load state,