提出了基于阴极选通电源技术的微光夜视仪强光防护装置设计方法, 该方法是在像增强器阴极两端加入选通电源, 电源感知进入像增强器的光量, 根据输入光强度的变化, 控制电路自动高速接通或者切断像增强器上的直流高压, 利用荧光屏电流作为反馈信号, 通过调节门脉冲信号的占空比, 使得像增强器工作时间缩短, 保持荧光屏上输出图像的亮度不变。介绍了电源的工作原理及设计方法, 描述了强光防护的实现过程, 利用阴极选通电源技术对近贴式像增强器的电源进行了改造。试验结果表明, 该方法电路简单, 实现了强光防护, 扩展了仪器在不同光照下的应用范围, 提高了仪器的使用性能。

A new threshold of anti-highlight in low-light-level night vision system was given based on technology of cathode protection in gating power circuit,which added gating power circuit between cathode of image intensifier.Luminous flux of image intensifier was induced by power, and according to the change of inputing light intensity, control circuits automatically connected or cut Dc high voltage of image intensifier at high-speed. By adjusting the duty ratio of door pulse signal and using the current of fluorescent screen as feedback signals, the working time of image intensifier was shortened, and the output image brightness of screen kept unchanged.The working principle and design method of image intensifier was introduced, and the process of realizing the anti-highlight was described. The power of the image intensifier was transformed using the technology of cathode protection in gating power circuit. The test results show that the circuit is simple, and it could expand the application range of instruments, which could work under different illumination, realizing the enhanced performance.