Control method and control device of board card cooling fan

The invention discloses a control method and a control device for a cooling fan of a board card, and relates to the technical field of computers, the control method and the control device are used for a main control chip on the board card, and the cooling fan, at least one temperature sensor, at least one voltage sensor and at least one current sensor are integrated on the board card; comprising the steps of determining a target working mode of the board card cooling fan; acquiring sensor data of the temperature sensor, the voltage sensor and the current sensor, and determining the duty ratio of the output PWM wave according to the sensor data; and based on a rotating speed difference between a first rotating speed of the cooling fan driven by the driving voltage and a target rotating speed corresponding to the target cooling temperature, determining a target PWM wave for adjusting output. According to the method and the device, more accurate and more real-time rotation speed adjustment of the cooling fan is