一种基于多谐振开关槽与Buck-Boost电路的准并联变换器  

A Quasi Parallel Converter Based on Multi Resonant Switched Tank and Buck-Boost Circuit

作　　者：戴瑞然 马运东[1] 王鹏[1] 王鹏飞 Dai Ruiran;Ma Yundong;Wang Peng;Wang Pengfei(College of Automation Engineering Nanjing University of Aeronautics and Astronautics,Nanjing 211106 China)

机构地区：[1]南京航空航天大学自动化学院,南京211106

出　　处：《电工技术学报》2024年第18期5768-5785,共18页Transactions of China Electrotechnical Society

摘　　要：谐振开关电容变换器具有效率高、体积小、质量轻和易集成等优点,是中间母线变换器的理想拓扑,然而其不足之处在于电压比固定以及软开关特性易受谐振参数容差的影响。该文针对这两个问题,将多谐振开关槽式变换器与四开关Buck-Boost变换器进行结合,提出一种基于准并联架构的中间母线变换器,详细分析变换器的工作原理与电压增益特性。通过推导电流时域表达式详细分析谐振参数容差对变换器的影响,并给出参数设计的方法。该文研究一种合适的控制方式,完成环路补偿设计,实现输出电压的闭环控制。通过仿真和实验对上述理论和解决方案进行验证。With the rapid development of 5G communication,big data,artificial intelligence,and other emerging information technologies,data centers are becoming the critical infrastructure with rapid increases in application scale and power demand.The intermediate bus converter(IBC)is a critical power stage in the power supply architecture.Resonant switched capacitor converters(RSCCs)have the advantages of high efficiency,small size,lightweight,and potential for integration,which are suitable for IBC.This paper investigates an IBC based on the resonant switched capacitor to achieve high efficiency,low cost,and voltage regulation.Firstly,the conventional 2X step-down RSCC is investigated,and its working principle and voltage gain characteristics for zero-current turn-off operation are analyzed.However,it has shortcomings in the fixed voltage ratio and the susceptibility of the soft switching characteristics to resonant parameters.The simulation shows the resonant frequency drifts due to the tolerance of components,and the switches have hard turning-off problems,thus reducing the efficiency of the converter.The influence of component variation on the converter is analyzed by deducing the time-domain expression of the resonant current.Therefore,a multi-resonant switched capacitor converter(MRSCC)with high immunity toward component variation is introduced.The converter realizes the lossless reverse of the residual current in the resonant inductor within the dead time using the band-stop characteristic of the notch resonant frequency.The Class II ceramic capacitor can be used as the resonant component,which reduces the production cost.In order to meet different voltage conversion requirements of IBC,the multi-resonant switched tank converter(MRSTC)has been developed,and the basis and procedure for parameter design are proposed.Regarding the poor voltage regulation capability of convention RSCCs,an IBC based on quasi-parallel is investigated by combining MRSTC with a four-switch Buck-Boost(FSBB)converter.The working principle and

关 键 词：中间母线变换器 谐振开关电容变换器 多谐振开关槽式变换器 准并联架构 

分 类 号：TM46[电气工程—电器]