一种用于FHSM控制的BSRC实现低压侧ZCS和低电流有效值的谐振腔设计方法  

A Resonant Tank Design Method for BSRC with FHSM Achieving ZCS and Low RMS Current at Low-Voltage Side

作　　者：黄君仪 韩华[1] 许国 路正美 粟梅[1] Huang Junyi;Han Hua;Xu Guo;Lu Zhengmei;Su Mei(School of Automation Central South University,Changsha 410083 China)

机构地区：[1]中南大学自动化学院,长沙410083

出　　处：《电工技术学报》2025年第4期1193-1202,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金面上项目(52277210);国家自然科学基金联合基金项目(U23B20129)资助。

摘　　要：该文揭示了基波同步调制(FHSM)下双向串联谐振变换器(BSRC)谐振腔特征阻抗与其低压侧开关管零电流关断(ZCS)特性之间的关系。同时,该文提出一种基于特征阻抗的谐振腔设计方法用于FHSM控制下的BSRC,使得变换器的低压侧可以实现低电流有效值和开关管宽范围ZSC,从而减小低压大电流作用下低压侧的开关损耗和导通损耗。该文首先分析FHSM控制下BSRC的特征阻抗对谐振电流的影响以及低压侧实现ZCS和低电流有效值的条件,然后在此基础上提出谐振腔设计方法,最后研制了一台额定功率为6kW、额定输出电流为100A的实验样机,验证了所提方法的有效性。The FHSM method is applied in the bidirectional resonant converter to achieve wide voltage gain with fixed switching frequency and smooth bidirectional power transmission.The existing resonant parameter design methods for the bidirectional resonant converter with FHSM may result in high turn-off current and reactive power at the high-current side in the low-voltage application.This paper proposes a characteristic-impedance-based resonant tank design method for the FHSM-controlled BSRC to achieve wide-range ZCS and low reactive power at the high-current side.Firstly,the characteristic-impedance-based resonant tank model of the FHSM-controlled BSRC is analyzed.The characteristic impedance of the resonant tank affects the amplitude and zero-crossing point of the resonant current,thereby affecting the RMS current and ZCS performance of the converter.Then,by analyzing the port voltages of the resonant tank and current with the Fourier transform,it is found that increasing the characteristic impedance leads to a decrease in the amplitude of higher-order harmonics of resonant current,thus reducing the reactive power of the FHSM-controlled BSRC.In addition,when the characteristic impedance increases to a threshold value,the impact of higher-order harmonics on the resonant current becomes small,and the resonant current has the same zero-crossing points as the low-voltage side midpoint voltage.Thus,ZCS can be realized for low-voltage side switches.The characteristic impedance range of FHSM-controlled BSRC at the low-voltage side is obtained by substituting the critical condition into the expression of resonant current.Considering the resonant capacitor’s voltage stress and the resonant inductor’s volume,the resonant parameters are recommended to achieve ZCS under high output current conditions.Under low output current conditions,the low-voltage side switches turn off with a small current,facilitating ZVS.The FHSM-controlled BSRC has a lower RMS current using the proposed design method than the two existing resonant par

关 键 词：低压大电流 双向串联谐振变换器 基波同步调制 零电流关断 

分 类 号：TM46[电气工程—电器]