| DC/DC converter with high power and wide range input voltage was required for more reliable special aero-power systems. Through comparison of characteristics for different DC/DC topologies, Buck-Boost converter was selected as main topology of the power system.The working principle of Buck-Boost is first introduced, and averaging model of non-ideal Buck-Boost converter is established. The design details for voltage loop were given and zero-pole compensation method from classic control theory was applied to the filed of power electronics. Thus, small-signal model of closed-loop was established, with detailed design guidelines for correction network. Base on the above-mentioned analysis and also with the help of MATLAB simulation, transfer function of the correction network was designed. Then experimental results verify correctness of the network's parameters. Besides, the design procedure and power loss analysis were given for a Buck-Boost converter of 540kW 27-270VDC/28VDC.By using the correction approach of vary-transfer function for designing parameter of closed-loop in the area of power electronics, the system could work reliably under wide range input voltage conditions. Compared with the design method of closed-loop parameter, the advantages of the correction approach of vary-transfer function were highlighted and testified by simulation and experimental results.
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