改进二次型Buck-Boost变换器的研究与分析  

Research and Analysis of an Improved Quadratic Buck-Boost Converter

作　　者：朱高中 刘树林[1] 王成[1] 李雪婷 ZHU Gaozhong;LIU Shulin;WANG Cheng;LI Xueting(School of Electircal and Control Engineering,Xi’an University of Science and Technology,Xi’an Shaanxi 710054,China;School of Physics and Electircal Engineering,Weinan Normal University,Weinan Shaanxi 714099,China)

机构地区：[1]西安科技大学电气与控制工程学院,陕西西安710054 [2]渭南师范学院物理与电气工程学院,陕西渭南714099

出　　处：《广西师范大学学报（自然科学版）》2022年第4期68-78,共11页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金(51777167,51604217);教育部产学合作协同育人项目(201901178002);国家级大学生创新创业训练项目(S202010723024);渭南师范学院自然科学项目(18YKS20)。

摘　　要：针对传统变换器电压增益低、开关器件电压应力大和输出具有较大电压纹波的缺点,通过在传统二次型Buck-Boost变换器后级增加开关电容单元和LC滤波器,提出一种改进二次型Buck-Boost变换器。对该改进变换器在连续导通模式(CCM)下的工作原理进行分析,同时从不同角度对所提改进二次型Buck-Boost变换器和其他二次型变换器进行对比,表明所提改进变换器具有良好的性能特征。最后,对改进二次型Buck-Boost变换器和改进前二次型Buck-Boost变换器进行实验分析,由实验对比可知改进后变换器输出电压增益是改进前变换器输出电压增益的(1+D)/D倍。在输出电压均为37.4 V的升压模式下,改进前输出电压纹波是改进后输出电压纹波的3倍。在输出电压均为9 V的降压模式下,改进前输出电压纹波约是改进后输出电压纹波的12倍;同时在同等输出电压的情况下,改进后开关器件的电压应力明显减小。实验和理论分析验证了所提改进二次型Buck-Boost变换器是可行的。Aiming at the disadvantages of low voltage gain of traditional converters,high voltage stress of switching devices,and large output voltage ripple.An improved quadratic Buck-Boost converter is proposed by adding a switched capacitor unit and an LC filter in the rear stage of the traditional quadratic Buck-Boost converter.Firstly,the working principle of the new converter in continuous conduction mode(CCM)is analyzed.Then,the new converter is compared with other quadratic converters from different angles and the results show that the new converter has good performance characteristics.Finally,a comparison is carried out between the experiment of the new converter and the experiment of the original converter,and the results show and that the output voltage gain of the new converter is(1+D)/D times of that of the original one.In the step-up mode with the output voltage of 37.4 V,the output voltage ripple before improvement is approximately 3 times of that after improvement.In the step-down mode with the output voltage of 9 V,the output voltage ripple before improvement is approximately 12 times of that after improvement.At the same time,the voltage stress of the switching device is significantly reduced under the same output voltage.Both of the expermental and theoretical analysis verify that the improved quadratic Buck-Boost converter is feasible.

关 键 词：连续导通模式 电压应力 二次型Buck-Boost变换器 电压倍增单元 电压增益 

分 类 号：TM46[电气工程—电器]