弱励磁电感对全桥DC-DC变换器的影响及其自主软开关  

Influence of Weak Excitation Inductance on Full-bridge DC-DC Converter and Its Autonomous Soft-switching

作　　者：胡翔宇 洪峰[1] 邵栋伟 HU Xiangyu;HONG Feng;SHAO Dongwei(School of Electronic Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,Jiangsu,China)

机构地区：[1]南京航空航天大学电子信息工程学院,江苏南京211106

出　　处：《电气传动》2024年第12期40-46,共7页Electric Drive

摘　　要：开关电源如今朝着高频软开关以及高功率密度的方向发展,磁性元件的体积大幅度减小,变压器励磁电感不再满足传统分析的大励磁电感假设。在此背景下,分析了弱励磁电感对全桥电路的影响,同时提出在弱励磁电感条件下全桥电路能够通过电容的充放电而实现自主软开关。全桥变换器的自主软开关可在占空比较大时实现,通过原理分析及计算得出了开关管体电容充放电以及电感电流与时间常数的关系,并通过仿真验证了上述原理。最后搭建了工作频率为200 kHz的实验台,对上述分析与仿真结果进行了实验验证。Switching power supply is now developing towards high-frequency soft-switching and high power density,the volume of magnetic components is greatly reduced,and the excitation inductance of transformer no longer meets the assumption of large excitation inductance in traditional analysis.Under this background,the influence of the weak excitation inductance on the full-bridge circuit was analyzed,and proposed that the full bridge circuit can achieve autonomous soft-switching through the charging and discharging of the capacitor under the condition of the weak excitation inductance.The autonomous soft-switching of the full-bridge converter can be realized when the duty ratio is large.Through principle analysis and calculation,relationship between the charge and discharge of the switch body capacitance and the inductance current and the time constant was obtained,and the above principle through simulation were verified.Finally,an experimental platform with a working frequency of 200 kHz was built to verify the above analysis and simulation results.

关 键 词：弱励磁电感 全桥DC-DC变换器 软开关 

分 类 号：TM433[电气工程—电器] TM46