Dual Active Bridge-Based Battery Charger for Plug-in Hybrid Electric Vehicle With Charging Current Containing Low Frequency Ripple
Dual Active Bridge-Based Battery Charger for Plug-in Hybrid Electric Vehicle With Charging Current Containing Low Frequency Ripple
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DOI：
10.1109/tpel.2015.2413815
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发表时间：
2015-12-01
影响因子：
6.7
通讯作者：
Diaz, Daniel
中科院分区：
文献类型：
--
作者：
Xue, Lingxiao;Shen, Zhiyu;Diaz, Daniel
制造商希望插电式混合动力汽车的车载电池充电器具有高功率密度。宽带隙器件可以通过提高开关频率来缩小其他无源元件，但交直流功率因数校正级的大块直流链路电容器，成为提高功率密度的主要障碍之一，因为它的体积取决于直流电流充电系统中双线频率处的纹波功率。但是，如果这种双线频率纹波流入电池，则直流链路电容可以显着降低。本文将这种充电方案称为正弦充电，并基于一个由全桥交流-直流级和双有源桥直流-直流级组成的两级电池充电系统进行分析和实现。我们进一步发现，变换器损耗导致纹波功率不平衡和直流链路电容增大。因此，分析了变换器损耗对纹波功率平衡的影响，并在此基础上提出了直流链路电压纹波的反馈控制，以进一步减小直流链路电容。在硅基和氮化镓基充电系统中验证了所提出的解决方案的有效性。
Manufacturers want high power density for the on-board battery chargers of plug-in hybrid electric vehicles. Wide bandgap devices can be used to shrink other passive components by increasing the switching frequency, but the bulk dc link capacitor of the ac-dc power factor correction stage, becomes one of the major barriers to higher power density, because its volume depends on the ripple power at the double line frequency in a dc current charging system. However, if this double line frequency ripple flows into the battery, the dc link capacitance can be significantly reduced. This charging scheme, named as sinusoidal charging in this paper, is analyzed and implemented based on a two-stage battery charging system, which is comprised of one full bridge ac-dc stage and one dual active bridge dc-dc stage. We further find that converter loss causes ripple power imbalance and bigger dc link capacitance. Therefore, the impact of converter loss on the ripple power balance is analyzed, and a feedback control on the dc link voltage ripple is proposed based on this analysis in order to further reduce the dc link capacitance. The effectiveness of the proposed solutions is verified in both Si-based and GaN-based charging systems.