基于改进三电平LLC谐振软开关DC/DC变换器的研究  

Research on improved three level LLC resonant soft switching DC/DC converter

作　　者：王一博 许可 尤志亚 WANG Yibo;XU Ke;YOU Zhiya(Shaanxi Transportation Electronic Engineering Technology Co.,Ltd.,Xi’an 710000,China)

机构地区：[1]陕西交通电子工程科技有限公司,陕西西安710000

出　　处：《电气应用》2025年第2期90-96,共7页Electrotechnical Application

摘　　要：提出了一种改进的三电平LLC谐振软开关DC/DC变换器。通过引入母线对称飞跨谐振电容和箝位二极管,提高系统稳定性并简化设计。常规变换器因谐振电容导致发热和电压应力问题,存在系统失控风险。提出的母线对称飞跨谐振电容及增加箝位二极管的方法,用于在宽范围输出电压条件下实现软开关控制。实验结果表明,所提方法有效抑制了系统谐振时的电压过冲,同时使用低压分散电容,降低了电容发热与系统成本,能实现对输出电压的动态调节,且动态响应良好。The article presents an improved three-level LLC resonant soft-switching DC-DC converter.By introducing a bus-symmetric flying resonant capacitor and a clamp diode,the system stability is enhanced,and the system setup was validated.A significant drawback of conventional converters is the heat generation and voltage stress issues caused by the current passing through the resonant capacitors,which poses a risk of system instability.I proposed the method of using a bus-symmetric flying resonant capacitor along with an additional clamp diode to achieve soft-switching control under a wide range of output voltage conditions.Experimental results indicate that the proposed method effectively suppresses voltage overshoot during the startup phase,reduces capacitor heating,and allows the low-voltage resonant capacitor to lower system costs while enabling dynamic adjustment of the output voltage with good dynamic response.

关 键 词：三电平 LLC谐振 软开关 DC/DC变换器 控制策略 

分 类 号：TM4[电气工程—电器]