自动门控电源作为微光像增强器的能量来源，其阴极脉冲占空比与荧光屏电流的关系对完善自动门控电源的自动亮度控制（ABC）电路设计具有重要意义。从自动门控电源与微光像增强器的匹配应用方面分析了阴极脉冲占空比对荧光屏电流的影响，又从自动门控电源ABC 电路设计方面分析了阴极脉冲占空比如何跟随荧光屏电流变化，才能确保微光像增强器荧光屏亮度的基本恒定，给出了自动门控电源阴极脉冲占空比与荧光屏电流的曲线图。

Investigating the relationship between cathode pulse duty cycle and phosphor screen current is extremely important for improving the automatic brightness control (ABC) circuit design of auto-gated power sources that are used as power supplies for image intensifiers. On one hand, our investigation includes analysis of the influence of cathode pulse duty cycle on phosphor screen current taking into account the matching application of the auto-gated power source and the image intensifier. On the other hand, in order to ensure that the phosphor screen brightness is maintained at a constant level, our investigation also includes the analysis of the change in cathode pulse duty cycle with change in phosphor screen current taking into account the design of the ABC circuit of the auto-gated power source. Finally, the curve diagram showing the relationship between cathode pulse duty cycle and phosphor screen current is presented.