电工技术学报  2020, Vol. 35 Issue (zk2): 461-469    DOI: 10.19595/j.cnki.1000-6753.tces.191650
电力电子 |
零电压开关N型交错并联三电平双向DC-DC变换器
鲁思兆, 吴雷, 李思奇, 韦光勇
昆明理工大学电力工程学院 昆明 650504
Zero Voltage Switching N-Type Interleaved Three-Level Bidirectional DC-DC Converter
Lu Sizhao, Wu Lei, Li Siqi, Wei Guangyong
Department of Electrical Engineering Kunming University of Science and Technology Kunming 650504 China
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摘要 针对传统的两电平双向DC-DC变换器开关管电压应力较大和输入输出电流及电感电流纹波较大的问题,提出一种零电压开关N型交错并联三电平双向DC-DC变换器。该变换器采用两相三电平交错并联的结构,以开关管依次移相90°的方式导通,减小了输入输出的电流纹波和开关管的电压应力;通过变频软开关控制使该变换器在宽范围负载内能实现所有开关管的零电压开通(ZVS),提高变换器的工作效率。文中详细分析该拓扑结构的工作原理和数学模型,推导出电感电流纹波、输入电流纹波与占空比的关系。同时,在实现ZVS的工作状态下推导电感最小负电流、电感平均电流和开关频率之间的关系。最后,搭建50V/200V 650W的实验样机,对理论分析结果进行实验验证。实验中变换器的所有开关管均实现了ZVS且输入电流纹波几乎为0,其满载效率为96.85%。
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关键词 双向DC-DC变换器交错并联三电平零电压开通电流纹波    
Abstract:In this paper, a zero voltage switching (ZVS) N-type interleaved three-level bidirectional DC-DC converter is proposed in order to overcome several critical issues, such as high voltage stress on the switches, large current ripples in the input current, output current and inductor current, which are associated with two-level DC-DC converters. The proposed converter adopts a paralleled two-phase interleaving three-level structure and its switches are turned on with a phase-shifting angle 90°, which reduces the input and output current ripples as well as the voltage stresses on the switches. A soft-switching control algorithm based on frequency adjustment is employed which enables the converter to achieve ZVS of all switches within a wide load range. Consequently, the efficiency of the converter can be improved. The operation principles and mathematical model of the converter have been analyzed in detail and the relations among the inductor current ripple, the input current and the duty cycle have been deduced. Meanwhile, the relations among the minimum negative inductor current, the average inductor current and the switching frequency have also been derived under the ZVS condition. Finally, a 50V/200V 650W prototype has been built and the theoretical analysis results are verified by the experiments. The ZVS operation is realized for all the power devices, the input current ripple of the converter is almost zero and an efficiency of 96.85% is achieved.
Key wordsBidirectional DC-DC converter    interleaved multiphase three-level    zero voltage switching    current ripples   
收稿日期: 2019-11-28     
PACS: TM46  
基金资助:国家自然科学基金青年基金资助项目(51707088,51607081)
通讯作者: 李思奇 男,1983年生,教授,研究方向为电力电子变换系统及电动汽车无线充电等。E-mail:lisiqi@kust.edu.cn   
作者简介: 鲁思兆 男,1985年生,副教授,研究方向为多电平变换器拓扑结构及其控制。E-mail:lusz10@kust.edu.cn
引用本文:   
鲁思兆, 吴雷, 李思奇, 韦光勇. 零电压开关N型交错并联三电平双向DC-DC变换器[J]. 电工技术学报, 2020, 35(zk2): 461-469. Lu Sizhao, Wu Lei, Li Siqi, Wei Guangyong. Zero Voltage Switching N-Type Interleaved Three-Level Bidirectional DC-DC Converter. Transactions of China Electrotechnical Society, 2020, 35(zk2): 461-469.
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