Abstract: The BUMP power supply is the key equipment responsible for the beam extraction of the medical heavy ion accelerator. The synchronization of the current rise affects the extraction efficiency of the beam, and the diversity of the current waveform is closely related to the treatment mode and treatment accuracy. It is necessary to generate 1~5 ms rising and accurately synchronized excitation current on the convex rail magnet (0.2~0.4 mH), and ensure the current tracking and the diversity of the waveform. Real-time adjustment of the strong excitation voltage and current waveform based on characteristic parameters are adopted. Control Method. This article introduces the software and hardware design of the digital controller for the BUMP power supply based on Inter's SoC(System-on-a-Chip) technology, and it is applied to the medical heavy ion accelerator device for the first time. After field verification, it is produced on different convex rail magnets. The synchronously changing current of 1~5 ms is achieved, and the tracking accuracy (>5 s) of the current rising period is guaranteed, which meets the design requirements.