55-kW Variable 3X DC-DC Converter for Plug-in Hybrid Electric Vehicles
55-kW Variable 3X DC-DC Converter for Plug-in Hybrid Electric Vehicles
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DOI：
10.1109/tpel.2011.2165559
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发表时间：
2012-04-01
影响因子：
6.7
通讯作者：
Tolbert, Leon M.
中科院分区：
文献类型：
--
作者：
Qian, Wei;Cha, Honnyong;Tolbert, Leon M.
在插电式混合动力汽车(HEV)牵引传动系统中，提出了一种将蓄电池与逆变器直流母线连接的传统DC-DC转换器的替代方案。商用混合动力汽车中使用的升压变流器在小型化的同时，在提高额定功率和实现高效率方面遇到了障碍。提出了一种四电平飞控电容式DC-DC转换器，可以通过大幅降低电感要求来克服这些缺点。四电平转换器的一个特例，即3X DC-DC转换器，在三个离散的输出/输入电压比下工作，从而进一步将电感要求降低到最小值(几乎为零)。与开关电容DC-DC转换器相比，3X DC-DC转换器可以在不牺牲效率的情况下以可变的输出/输入电压比工作，并且它利用寄生电感降低了对电容的要求。介绍了逆变器的工作原理、电流纹波分析、抑制励磁涌流的暂态控制和功率损耗分析。给出了55kW样机的实验结果，验证了该拓扑的原理和分析。
This paper presents an alternative to the traditional dc-dc converter interfacing the battery with the inverter dc bus in plug-in hybrid electric vehicle (HEV) traction drives. The boost converter used in commercial HEVs meets with obstacles when it comes to upgrading the power rating and achieving high efficiency while downsizing the converter. A four-level flying-capacitor dc-dc converter is explored that can overcome these drawbacks by dramatically reducing the inductance requirement. A special case of the four-level converter, the 3X dc-dc converter, operates at three discrete output/input voltage ratios, thus further reducing the inductance requirement to a minimal value (almost zero). When further compared to its switched-capacitor dc-dc converter counterparts, the 3X dc-dc converter can be operated at variable output/input voltage ratios without sacrificing efficiency, and it lowers the capacitance requirement by utilizing the parasitic inductance. The operating principle, current ripple analysis, the transient control to limit the inrush current, and power loss analysis are introduced. Experimental results of a 55-kW prototype are provided to demonstrate the principle and analysis of this topology.