Magnetic-Coupling Current-Balancing Cells Based Input-Parallel Output-Parallel LLC Resonant Converter Modules for High-Frequency Isolation of DC Distribution Systems
Magnetic-Coupling Current-Balancing Cells Based Input-Parallel Output-Parallel LLC Resonant Converter Modules for High-Frequency Isolation of DC Distribution Systems
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DOI：
10.1109/tpel.2015.2507172
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发表时间：
2016-10
影响因子：
6.7
通讯作者：
Chuang Liu;Xinzhe Xu;Dacheng He;Haiyang Liu;X. Tian;Ying Guo;G. Cai;Chenglian Ma;Gang Mu
中科院分区：
文献类型：
--
作者：
Chuang Liu;Xinzhe Xu;Dacheng He;Haiyang Liu;X. Tian;Ying Guo;G. Cai;Chenglian Ma;Gang Mu
输入并联输出并联（IPOP）DC-DC变换器适用于低压大电流场合，特别是在直流配电中采用高频隔离代替传统的工频Transformer用于AC-DC变换器。与现有的IPOP DC-DC变换器闭环控制方法相比，本文提出了基于磁耦合电流平衡（MC-CB）单元的IPOP LLC谐振变换器模块，该模块能够实现IPOP系统自然开环工作。LLC模块可用作准谐振模式下的高频隔离直流Transformer，可实现逆变侧零电压开关（ZVS）和整流侧零电流开关（ZCS），确保高功率密度和高效率。所提出的用于IPOP LLC谐振变换器模块的MC-CB单元可以自适应地确保组成模块之间的输入电流共享（ICS）和输出电流共享（OCS），以使IPOP系统稳定地运行。此外，基于磁模型分析了IPOP变换器系统中MC-CB单元的稳态和动态均流性能。最后设计了一个硬件样机并进行了测试。实验结果验证了所提出的用于IPOP LLC谐振变换器模块的MC-CB单元的有效性和性能。
The input-parallel output-parallel (IPOP) dc-dc converters are suitable for low-voltage and high-current applications, especially using high-frequency isolation instead of traditional line-frequency transformer for ac-dc converters in dc distribution. Compared to the existing closed-loop control for IPOP dc-dc converters, the magnetic-coupling current-balancing (MC-CB) cells based IPOP LLC resonant converter modules are proposed in this paper, which can realize the IPOP system work under open-loop operating condition naturally. The LLC modules can be used as a high-frequency isolation dc transformer operating under the quasi-resonant mode, which can achieve zero-voltage switching (ZVS) for inverter side and zero-current switching (ZCS) for rectifier side ensuring high power density and high efficiency. The proposed MC-CB cells for IPOP LLC resonant converter modules can adaptively ensure both the input-current sharing (ICS) and the output-current sharing (OCS) among constituent modules to make the IPOP system operate stably. Additionally, the steady-state and dynamic-state current-sharing performance of MC-CB cells for the IPOP converter system are analyzed based on a magnetic model. In the end, a hardware prototype has been designed and tested. The experimental results have verified the validity and performance of the proposed MC-CB cells for the IPOP LLC resonant converter modules.