摘 要

本文针对通信领域对高性能、大功率直流开关电源的需求，详细分析了5kW通信用开关电源的工作原理，并提出了一套完整的主电路和控制电路设计方案。文中首先从三相桥式不控整流、全桥变换器、高频变压器、滤波电路等关键环节对主电路进行了深入探讨，并提出了采用多个电源模块并联运行以实现大功率输出的解决方案。同时，文中还研究了并联运行时的自动均流技术，并详细介绍了基于平均值的自动均流电路设计。在电压调节方面，本文详细分析了基于UC3825控制芯片的PWM控制电路。研制的直流开关电源具备输出电压可调、输出电流大、纹波小等优点，并集成了换档和远程控制功能。通过实验验证，所设计的电源基本达到了设计要求，证明了理论分析的准确性，并具有广阔的应用前景。

关键词：开关电源；通信电源；主电路设计；PWM控制；仿真分析

ABSTRACT

According to the demand of high performance and high power DC switching power supply in the communication field, this paper analyzes the working principle of 5kW communication switching power supply in detail, and proposes a complete set of main circuit and control circuit design scheme. In this paper, the main circuit is deeply discussed from the key links such as three-phase bridge uncontrolled rectification, full bridge converter, high frequency transformer and filter circuit, and the solution of using multiple power modules in parallel to achieve high power output is proposed. At the same time, the automatic flow equalization technology in parallel operation is studied, and the design of the automatic flow equalization circuit is introduced in detail. In terms of voltage regulation, the PWM control circuit based on UC3825 control chip. The developed DC switch power supply has the advantages of adjustable output voltage, large output current and small ripple, and integrates gear shift and remote control functions. Through the experimental verification, the designed power supply basically meets the design requirements, proved the accuracy of the theoretical analysis, and has a broad application prospect.

Key words: switch power supply; communication power supply; main circuit design; PWM control; simulation analysis