本文通过对民用机载设备小功率电源的需求分析和标准解析，总结了传统设备内单独设计掉电保持 电路的优缺点，设计一种基于反激变换器的掉电保持电路，通过分析与测试，验证了该方案的有效性，满足机 载设备的应用场景。

By analyzing the standards and requirements of fine power supply for airborne equipment, advantages and disadvantages of input bus drop-out holdup circuit in convention equipment are summed up, and a drop-out holdup circuit is designed based on flyback converter. The holdup circuit which is applicable in airborne equipment is made possible through analyzing and testing.

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