一种低电流纹波高增益软开关直流变换器  

Soft-switching DC-DC Converter with Low Current Ripple and High Gain

作　　者：王建[1] 林国庆[1] WANG Jian;LIN Guoqing(Fujian Key Laboratory of New Energy Generation and Power Conversion(Fuzhou University),Fuzhou 350116,China)

机构地区：[1]福建省新能源发电与电能变换重点实验室(福州大学),福州350116

出　　处：《电源学报》2024年第2期36-46,共11页Journal of Power Supply

基　　金：福建省科技计划资助项目(2015H0017);晋江市福大科教园区发展中心资助项目(2019-JJFDKY-37)。

摘　　要：提出了一种应用于新能源发电系统的低电流纹波高增益软开关直流变换器。在传统交错Boost变换器基础上,该变换器通过引入耦合电感和二极管、电容升压单元提高电压增益,耦合电感在整个开关周期过程中都传递能量,提高了磁芯利用率。输入侧工作在交错模式,两相电感电流纹波可以相互抵消,从而获得较低的输入电流纹波。由于耦合电感自身漏感的存在,减轻了整流二极管反向恢复问题,同时采用有源钳位电路回收利用漏感能量,实现了所有开关管零电压软开关,抑制了开关管关断电压尖峰,提高了变换器转换效率。详细分析了变换器的工作原理、电路特性以及软开关实现方法。最后,搭建了一台200 W的试验样机验证了理论分析的正确性。A soft-switching DC-DC converter with low current ripple and high gain is proposed,which can be applied to new energy generation systems.Based on the conventional interleaved Boost converter,the proposed converter can achieve high gain by introducing a coupled inductor,diodes and a capacitor Boost unit.The coupled inductor transmits energy during the entire switching cycle,thus improving the utilization rate of magnetic core.The input Boost stage works in an interleaved mode,and the current ripple of the two-phase inductor can cancel each other,so as to obtain a lower input current ripple.Due to the existence of leakage inductance of the coupled inductor,the reverse recovery problem of rectifier diodes are alleviated.Meanwhile,an active clamp circuit is adopted to absorb the leakage inductance energy,thereby achieving the zero-voltage soft-switching of all switches,restraining the turn-off voltage spike of switches,and improving the converter’s conversion efficiency.The working principle,circuit characteristics and soft-switching realization method of the converter are analyzed in detail.Finally,a 200 W experimental prototype was built to verify the theoretical analysis.

关 键 词：新能源发电 低电流纹波 高增益 零电压软开关 

分 类 号：TM46[电气工程—电器]