In order to solve the problem of high voltage stress of the switching caused by the High DC input single-ended flyback converter and serious mutual influence between the multiple outputs of the single-ended flyback converter due to strong coupling, a dual-switch flyback converter and a full bridge are designed. The converter two-stage topology structure, in order to avoid the influence of the zero point of the right half plane of the continuous current mode, a type II feedback compensation network is used, the open-loop transfer function of the dual-switch flyback converter before and after compensation is calculated, and by applying Matlab provided Bode diagram analyzes its stability. After that, the closed-loop feedback system of the dual-switch flyback converter is built in the PSIM simulation environment to simulate the rationality of the design parameters. Finally, the stability of the closed-loop feedback system and the independence of the multi-channel power supply output are verified by experiments.