Digital control power supply conversion system

The invention provides a digitally-controlled power conversion system, and the system comprises a power conversion module which comprises three units, each unit comprises a filter capacitor and a first switching tube, and the three units are an input unit, an output unit and an adjustment unit; the input unit comprises a first port, the adjusting unit comprises a second port, and the output unit comprises a third port; the control module is configured to be used for collecting the actual voltage of the first port, the actual voltage of the second port and the actual voltage of the third port and the expected voltage of the second port and the expected voltage of the third port, and judging the minimum value of the actual voltage of the first port and the expected voltage of the second port and the expected voltage of the third port. And adjusting the duty ratio of the first switch tube of the unit corresponding to the minimum value to be the set maximum duty ratio, and performing PID control on the first swit