适用于宽增益范围的可重构单级DC-DC变换器及其磁元件设计  

A Modular Reconfigurable Single-Stage DC-DC Converter Suitable for Wide Gain Range and its Magnetic Design

作　　者：管乐诗 温兆亮 许晓志 王懿杰[1] 徐殿国[1] Guan Yueshi;Wen Zhaoliang;Xu Xiaozhi;Wang Yijie;Xu Dianguo(Institute of Power Electronics and Electrical Drives Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学电力电子与电力传动研究所,哈尔滨150001

出　　处：《电工技术学报》2023年第6期1571-1583,共13页Transactions of China Electrotechnical Society

基　　金：黑龙江省自然科学基金资助项目(LH2020E050)。

摘　　要：该文基于开关电容结构与谐振网络单元的优势,提出适用于宽增益范围的模块化可重构单级DC-DC变换器,可根据输入电压范围来选择串入模块的数量,从而达到等效压缩谐振单元输入电压范围的目的,实现了变换器在宽增益范围内的高效率。同时,为了减小器件并联带来的不均流和局部过热等问题,该文设计了一种磁集成结构以代替传统采用分立磁心实现的平面矩阵变压器,并对比展示了所提出磁集成结构在变压器总损耗与功率密度上的优势,同时还给出了所提出磁集成结构变压器的损耗计算模型及其优化设计的方法。最后针对宽增益场景设计了输入电压为200~400V,额定功率500W的样机,验证了拓扑以及磁结构的有效性和正确性。In recent years,with the development of new energy storage systems,communication base stations,server power supplies,and electric vehicle charging,the corresponding systems have put forward higher requirements for DC-DC converters.It often requires a high step-down ratio DC-DC converter with wide input and wide output capability.Resonant converters represented by LLC have become a research hotspot in the field of high-frequency,high-efficiency,and high-density power supplies due to their advantages of easy soft-switching,fewer topological components,and low electromagnetic interference.However,when the voltage gain range is relatively large,the magnetizing inductance of the LLC converter will be relatively small,resulting in relatively high primary side circulating current and switch conduction losses.Therefore,a single LLC converter cannot simultaneously meet the requirements of wide gain range and high efficiency and high power density in the above scenarios.In this paper,a reconfigurable single-stage topology combining multi-module switched capacitor units and resonant network units is proposed,which is suitable for a new high step-down ratio DC-DC converter topology for data center DC power supply systems.The topology combines switched capacitors with characteristics of easy to combine,small size,soft switching of resonant circuit,and high transmission efficiency,it is a reconfigurable single-stage transmission structure.For high input voltage,a series reconfiguration unit can be added,and for large output current,a parallel resonant unit can be added.The switched capacitor unit can be selected from a switched capacitor circuit(SC)or a switched tank converter(STC),and the resonant network unit can be selected from common resonant circuits such as LLC and CLLC.This paper takes switched capacitor and LLC resonant converter as examples to analyze the specific working principle and characteristics of the constructed topology.In this design,the switching of the order of the SC network is adopted,which further redu

关 键 词：宽增益范围 开关电容 LLC 变换器 磁集成设计 损耗优化 

分 类 号：TM46[电气工程—电器]