高效四开关Buck-Boost变换器多模式控制策略  

High-efficiency four-switch Buck-Boost converter multi-mode control strategy

作　　者：郭强 张帆云 李海啸 闫旻旸 Guo Qiang;Zhang Fanyun;Li Haixiao;Yan Minyang(School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学电气与电子工程学院,重庆400054

出　　处：《仪器仪表学报》2024年第11期101-116,共16页Chinese Journal of Scientific Instrument

基　　金：重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0997)资助。

摘　　要：四开关Buck-Boost变换器具有多模式运行优势,适用于宽范围电压调节场合。针对多模式下效率降低以及多模式控制的问题,提出一种环路开关选择型控制策略。首先,在变换器运行死区内引入Boost-T和Buck-T模式形成四模式控制,有效消除传统两模式控制中存在的死区影响;其次,对中间模式下切换边界进行优化并采取小范围变频控制,解决引入中间模式后变换器效率降低问题;然后,为解决多模式控制问题,通过探究系统共轭极点分布随模型参数变化的规律,设计了一种含输入电压前馈的开关选择型控制策略;最后,制作一台基于氮化镓的实验样机进行验证。实验结果表明,系统负载突增时,输出电压脉动在2.5 V以内,模式切换时输出电压脉动在1 V以内,同时满载时中间模式下最高运行效率达96.3%。The four-switch buck-boost converter has the advantage of multi-mode operation and is suitable for a wide range of voltage regulation.In order to solve the problem of multi-mode efficiency reduction and multi-mode control,a loop-switch selective control strategy is proposed.Firstly,the Boost-T and Buck-T modes are introduced into the dead zone of the converter to form a four-mode control,which effectively eliminates the influence of the dead zone in the traditional two-mode control.Secondly,the switching boundary in the intermediate mode is optimized and the frequency conversion control in a small range is adopted to solve the problem of reducing the efficiency of the converter after the introduction of the intermediate mode.Then,in order to solve the multi-mode control problem,a switch-selective control strategy with input voltage feedforward was designed by exploring the law of the conjugate pole distribution of the system with the model parameters.Finally,an experimental prototype based on GaN was fabricated,and the experimental results show that the output voltage ripples within 2.5 V when the system load bursts,the output voltage ripples within 1 V when the mode is switched,and the maximum operating efficiency in the intermediate mode reaches 96.3%when the load is full.The four-switch buck-boost converter has the advantage of multi-mode operation,which is suitable for a wide range of voltage regulation.To solve the problem of multi-mode efficiency reduction and multi-mode control,a loop-switch selective control strategy is proposed.Firstly,the Boost-T and Buck-T modes are introduced into the dead zone of the converter to form a four-mode control,which effectively eliminates the influence of the dead zone on the traditional two-mode control.Secondly,the switching boundary in the intermediate mode is optimized and the frequency conversion control in a small range is utilized to address the problem of reducing the efficiency of the converter after the introduction of the intermediate mode.Then,to solve the mult

关 键 词：四开关Buck-Boost 变频控制 四模式控制 开关选择型 输入电压前馈 

分 类 号：TM46[电气工程—电器] TH39[机械工程—机械制造及自动化]