电源学报2024，Vol.22Issue(z1)：1-8,8.DOI:10.13234/j.issn.2095-2805.2024.S1.1
高压大功率LLC谐振变换器死区时间优化设计方法研究
Research on Optimal Design Method of Dead Time for High-voltage High-power LLC Resonant Converter
摘要
Abstract
In recent years,LLC resonant converters have been widely applied in the fields of high-power,high-voltage,and medium-and high-frequency power conversion owing to their characteristics of soft-switching and capability of electric isolation.Due to the constraints on the existing high-voltage devices,a large dead time is necessary to guarantee the safe and reliable operation of bridge legs in the circuit,which may affect the soft-switching performance of LLC resonant converters.In this paper,the influence of a large dead time on the soft-switching characteristics of an LLC resonant converter is studied.A quantitative calculation method is given to determine the range of dead time under full-power conditions from the perspectives of safe switching,discharging of junction capacitor and anti-parallel diode freewheeling,respectively.Then,an optimal design method of dead time is proposed accordingly.Finally,a 150 kW high-power power electronic transformer prototype with 6.5 kV/250 A IGBT was built.Through the analysis and measurement of soft-switching conditions for the LLC resonant converter at different power levels,the validity of the proposed design method of dead time was verified.关键词
LLC谐振变换器/死区时间/高压大功率/软开关Key words
LLC resonant converter/dead time/high-voltage high-power/soft-switching分类
信息技术与安全科学引用本文复制引用
张捷频..高压大功率LLC谐振变换器死区时间优化设计方法研究[J].电源学报,2024,22(z1):1-8,8.基金项目
中国国家铁路集团有限公司科技研究开发计划资助项目(J2021J003)This work is supported by Research and Development Program of China State Railway Group Co.,Ltd.under the grant J2021J003 （J2021J003）
