Abstract: The booster power supply for the High Energy Photon Source (HEPS) is a dynamic power supply with an output current of 2 Hz offset sine wave. The input stage design of the power supply adopted the Boost circuit structure, and the current of the input inductor was smoothed by the double-closed loop algorithm, which reduced the grid fluctuation caused by the dynamic current output. The output adopted a two quadrant converter design, which generated PWM (pulse width modulation) waveform by phase shift multiplication, and improved the output frequency of the power supply. The power control adopted the self-developed FPGA-based digital power controller, and the control parameters were modified by the LabVIEW interface of the host computer to realize the waveform download and output current storage. Experiment results show that the output performance of 2 Hz dynamic power supply is better than the design index of 0.1% tracking error, which verifies the feasibility of power supply design and the accuracy of the algorithm.