一种低电压应力高效率ZVS-PWM Superboost变换器  

ZVS-PWM Superboost Converter with Low Voltage Stress and High Efficiency

作　　者：庞玉婷 杨华[1] 程新[1] 邱燕 PANG Yuting;YANG Hua;CHENG Xin;QIU Yan(Shanghai Institute of Space Power-Sources,Shanghai 200245,China)

机构地区：[1]上海空间电源研究所,上海200245

出　　处：《电源学报》2024年第6期33-42,共10页Journal of Power Supply

摘　　要：非隔离型Superboost变换器具有输入输出电流连续、效率高和功率密度高等优点,因此在航天器电源系统中被广泛应用。但在高电压增益场合中,器件开关损耗增加,导致变换器效率降低。为此,提出1种低电压应力ZVS-PWM Superboost变换器,通过引入谐振支路实现主开关的零电压开通和零电压关断及辅助开关的零电流开通和零电压关断,并且所有二极管均实现了软开关,从而有效降低了开关损耗,在未增加主功率器件电压和电流应力的基础上提高了变换器的效率。详细分析了所提变换器的工作原理、软开关实现条件及器件应力,采用状态空间平均法分析了该变换器的稳态和动态特性,并通过1台400 W/100 kHz样机验证了所提变换器的可行性。Owing to their merits including continuous input and output current,high efficiency and high power density,non-isolated Superboost converters are widely applied in spacecraft power systems.However,the switching loss of the device will increase in a scenario with a high step-up ratio,resulting in a decrease in the converter efficiency.To solve this problem,a zero-voltage switching pulse-width modulation(ZVS-PWM)Superboost converter with low voltage stress is proposed.By introducing a resonant tank,the main switch can be turned on or off under ZVS,and the auxiliary switch can be turned on under zero current switching and turned off under ZVS.Besides,all the diodes are operating under soft-switching.As a result,the switching loss is reduced effectively,and the converter efficiency is improved without increasing the voltage and current stress of the main power device.The operation principle,soft-switching conditions and device stress are analyzed in detail,and the state-space averaging approach is used to estimate the steady-state and dynamic characteristics of the proposed converter.In addition,its feasibility was verified by a prototype with 100 kHz and 400 W.

关 键 词：软开关 Superboost变换器 低电压应力 直流-直流变换器 

分 类 号：TM46[电气工程—电器]