本文主要研究三代微光像增强器光阴极保护。通过对三代微光像增强器性能分析，确定高照度下影响像增强器光阴极性能的主要因素，并分析了常规直流高压电源阴极保护电路，给出自动门控电源两种阴极保护电路设计思路。实际测量了基于常规直流高压电源的三代像增强器工作状态，自动门控电源两种阴极保护电路实际工作状态，验证了阴极保护电路设计。最后对研究课题进行了总结并确定了自动门控电源光阴极保护电路形式。

The paper focuses primarily on photocathode protection of three-generation image intensifiers. In particular, the main factors that affect the photocathode performance of the image intensifier under high illumination are determined. We analyze the photocathode protection circuit of a conventional high voltage DC power supply, and present the design concept of a two photocathode protection circuit for an auto-gating power source. The working conditions are also evaluated and the circuit design is verified. Finally, a summary of the work is provided, and the circuit form of the auto-gating power source photocathode protection is determined.