基于平均电流模式的同步Buck数字电源设计研究  

Research on design of synchronous buck digital power supply based on average current mode

作　　者：李键文 潘永雄[1] 徐家锐 梁康 Li Jianwen;Pan Yongxiong;Xu Jiarui;Liang Kang(School of Physics and Optoelectronic Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学物理与光电工程学院,广东广州510006

出　　处：《电子技术应用》2023年第2期121-126,共6页Application of Electronic Technique

摘　　要：高效率、高开关频率和数字控制是近年来开关电源领域的研究热点。探讨了基于平均电流模式的同步Buck数字电源设计策略,结合理论分析和Matlab/Simulink软件仿真,分析了同步Buck的环路设计条件,详细阐述了两种电压电流双闭环PI补偿器的设计方法,并提出了一种基于电流环简化的电压环设计方法。使用高性能主流MCU芯片STM32G474作为控制核心,利用高分辨率PWM技术实现200 kHz的开关频率,以中断事件触发和状态机运行思想来构建系统软件的架构。仿真和实验结果表明系统具有效率高、动态响应快和鲁棒性强等特点,为数字电源的通用化设计提供了参考。High efficiency,high switching frequency and digital control are the research hotspots in the field of switching power supply in recent years.In this paper,the design strategy of synchronous buck digital power supply based on average current mode is discussed.Combined with theoretical analysis and Matlab/Simulink software simulation,the loop control design conditions of synchronous buck are analyzed,two design methods of voltage and current double closed-loop PI compensator are described in detail,and a voltage loop control design method based on the simplification of the current loop is proposed.The highperformance mainstream MCU chip STM32G474 is used as the control core,and the high-resolution PWM technology is used to realize a switching frequency of 200 kHz,and the architecture of the system software is constructed with the idea of interrupt event triggering and state machine operation.The simulation and experimental results show that the system has the characteristics of high efficiency,fast dynamic response and strong robustness,which provides a reference for the general design of digital power supply.

关 键 词：同步Buck 双闭环PI控制 平均电流模式 数字电源 

分 类 号：TM46[电气工程—电器]