本文介绍了像增强器使用的自动门控电源的电路设计,重点介绍了自动亮度控制(ABC)反馈回路的实现。同时给出了相关的直流放大电路、ADC电路原理图。其中ABC反馈回路采用CPLD实现,能够精确地控制脉宽大小,使其与输入光的强度保持良好的线性关系,很好地满足了设计要求。 This article describes the circuit design of an automatic gated power supply for image intensifiers, highlighting the implementation of an automatic brightness control (ABC) feedback loop. At the same time gives the relevant DC amplification circuit, ADC circuit diagram. Among them, the ABC feedback loop is implemented by CPLD, which can precisely control the pulse width and maintain a good linear relationship with the intensity of the input light, which well meets the design requirements.