电工技术学报  2016, Vol. 31 Issue (14): 165-175    DOI:
电力电子 |
交错并联双向Buck/Boost集成LLC谐振型三端口直流变换器
孙孝峰, 申彦峰, 李午英, 王宝诚
燕山大学电力电子节能与传动控制河北省重点实验室 秦皇岛 066004
Interleaved Bidirectional Buck/Boost and LLC Integrated Three-Port DC-DC Converter
Sun Xiaofeng, Shen Yanfeng, Li Wuying, Wang Baocheng
Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province Yanshan University Qinhuangdao 066004 China
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摘要 将交错并联双向Buck/Boost电路与全桥LLC谐振电路通过共用全桥开关单元集成在一起,提出了一种新型的三端口直流变换器,实现了器件共享,降低了体积和成本。该三端口变换器包括两个双向端口和一个隔离的单向输出端口,通过PWM+PFM的混合调制策略,可实现端口间功率流的灵活控制。与传统的移相全桥集成型三端口直流变换器相比,提出的变换器输入电流纹波小,可在宽电压和功率范围内实现一次侧开关管的零电压软开关(ZVS)和二次侧整流二极管的零电流软开关(ZCS)关断,开关损耗小,而且不存在占空比丢失、变压器直流偏磁等问题。研究了该三端口变换器的工作原理、工作模式和端口功率传输模式,并对其增益、软开关等特性进行了深入分析,最后搭建了一台500W的实验样机,实验结果验证了变换器的实用性和理论分析的正确性。
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关键词 三端口变换器双向Buck/BoostLLCPWM+PFM混合调制软开关    
Abstract:By integrating the two-phase interleaved bidirectional Buck/Boost circuit with the full-bridge LLC resonant circuit, a novel three-port converter (TPC) is proposed. Thus, the full-bridge switching unit is shared and the cost is reduced. The proposed TPC consists of two bidirectional DC ports and an isolated unidirectional DC port. With PWM plus PFM modulation strategy, flexible power flow control can be easily achieved. All primary power switches operate with ZVS and all secondary diodes can achieve ZCS-off in wide voltage and power ranges, thus the switching losses are reduced. In addition, the duty cycle loss and transformer DC bias current inherently existed in conventional phase shift full-bridge integrated TPCs, can be well eliminated in the proposed TPC combined with the LLC resonant tank. The basic operation principle, operation modes and power transfer modes of the proposed TPC are investigated. Then both the gain and the ZVS characteristics are analyzed in detail. Finally, the experimental results from the built 500W prototype verify the proposed converter.
Key wordsThree-port converter    bidirectional Buck/Boost    LLC    PWM plus PFM mixed modulation    soft switching   
收稿日期: 2014-05-28      出版日期: 2016-07-28
PACS: TM46  
基金资助:国家自然科学基金资助项目(51077112)
作者简介: 孙孝峰 男,1970年生,教授,博士生导师,研究方向为变流器拓扑及控制、新能源并网和电能质量控制。E-mail: sxf@ysu.edu.cn
引用本文:   
孙孝峰, 申彦峰, 李午英, 王宝诚. 交错并联双向Buck/Boost集成LLC谐振型三端口直流变换器[J]. 电工技术学报, 2016, 31(14): 165-175. Sun Xiaofeng, Shen Yanfeng, Li Wuying, Wang Baocheng. Interleaved Bidirectional Buck/Boost and LLC Integrated Three-Port DC-DC Converter. Transactions of China Electrotechnical Society, 2016, 31(14): 165-175.
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