【摘要】 基于开关电源并联技术在大功率分布式电源中发挥的重要作用,设计并制作了一种以ARM微处理器TM4C123G为控制核心的高精度开关电源模块并联供电系统。本系统利用两个相同的同步Buck降压模块并联,对输出端的电压和两路Buck降压模块输出电流进行AD采样,TM4C123G将采样得到的数据进行双环PID调节,利用均流算法,输出可变的PWM波驱动Buck降压模块,实现两路Buck电流以任意比例输出且保持输出电压稳定。经测试,该系统两路设定比例分配的输出电流相对误差在0.1%之内,输出的电压稳定在0.6%的相对误差内波动,在额定功率时效率可高达90%。实验结果表明,该系统精度高、稳定性好、效率高,满足使用要求。更多还原

【Abstract】 Switching power supply in parallel system plays a important role in distributed power supply. A high precise switching power supply modules in parallel system which is controlled by ARM microprocessor TM4C123 G is designed.This system uses two similar synchronous Buck modules in parallel and samples from output voltage and two Buck modules’ current. By using the double PID regulator and current sharing algorithm,TM4C123 G deals with the sample data,then outputs variable PWM wave driving Buck modules,so that the two Buck modules can achieve any proportion output current and output voltage regulation. Through the debug of hardware and software,the two Buck currents have a relative error within 0. 1% and the output voltage has a relative error within 0. 6%. This system can get a high efficiency of 90%. The experimental result indicates that this system has a high precision,reliable steadiness and low powerconsumption. This system can easily meet the practical requirements.更多还原