宽输入飞跨电容型TL Buck-LLC级联变换器研究  

Research on Wide Input Flyover Capacitor TL Buck-LLC Cascaded Converter

作　　者：龚传姣 祝龙记[1] GONG Chuanjiao;ZHU Longji(College of Electrical and Information Engineering,Anhui University of Science and Technology,Huainan Anhui 232001,China)

机构地区：[1]安徽理工大学电气与信息工程学院,安徽淮南232001

出　　处：《佳木斯大学学报（自然科学版）》2023年第6期18-22,35,共6页Journal of Jiamusi University：Natural Science Edition

基　　金：国家自然科学基金(U1610120)。

摘　　要：与传统Buck-LLC级联变换器拓扑相比,飞跨电容型三电平Buck-LLC级联变换器开关器件的电压应力仅为输入电压的一半、滤波电感体积小,更适用于宽输入高压大功率DC/DC电源中。所提出的宽输入变换器,前级使用飞跨电容型TL Buck电路,使输入电压范围变宽;后级LLC谐振电路在提高变换器效率的同时,起到高频电气隔离的作用。与传统的双环定频控制相比,该变换器前级通过解耦控制PWM调节电压,后级采用模糊PI控制PFM。仿真结果证明,使变换器具有输入电压宽、适应负载变化能力强的特点。Compared with the traditional Buck-LLC cascaded converter topology,the voltage stress of the switching device of the flying capacitor three-level Buck-LLC cascaded converter is only half of the input voltage,and the filtering inductance volume is small,making it more suitable for wide input high-voltage high-power DC/DC power supplies.The wide input converter proposed in this article uses a flying capacitor TL Buck circuit in the front stage to broaden the input voltage range.The post stage LLC resonant circuit not only improves the efficiency of the converter,but also plays a role in high-frequency electrical isolation.Compared with traditional dual loop fixed frequency control,the front stage of this converter adjusts the voltage through decoupling control PWM,and the rear stage adopts fuzzy PI control PFM.The simulation results prove that the converter has the characteristics of wide input voltage and strong adaptability to load changes.

关 键 词：宽输入 TL Buck变换器 LLC谐振变换器 解耦控制 模糊控制 

分 类 号：TP271[自动化与计算机技术—检测技术与自动化装置]