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A navel electron beam welder (EBW) power supply was developed.Compared with the traditional 3-phase control 12-pulse rectifying supplies,it requires a much lower step-up ratio transformer,but a much less output ripple voltage can be obtained.The design of the main circuit of this new power supply is based on PWM buck-boost converter topology.In developing the system a fuzzy PID control method is adopted because of the strong non-linearity and big signal working conditions of the circuit system.The SABER-MATLAB models and fuzzy algorithm were used in developing the fuzzy PID controller.The co-simulation and experimental results displayed that the unit introduced herein has the characteristics of high control precision and anti-interference capability.