Analysis and parameters optimization of a contactless IPT system for EV charger
Analysis and parameters optimization of a contactless IPT system for EV charger
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电动汽车充电机非接触式IPT系统分析及参数优化
DOI：
10.1109/apec.2014.6803528
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
G. Lisi
中科院分区：
文献类型：
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作者：
Rui Chen;Cong Zheng;Zaka Ullah Zahid;E. Faraci;Wen;J. Lai;M. Senesky;David I. Anderson;G. Lisi
本文从理论分析和实验结果两方面讨论了串联补偿式感应功率传输系统的特性。为了使系统效率最大化，提出了两级结构，其中包括PFC级和工作在ZVS区域的谐振DC-DC级。实现实用的非接触式电动汽车充电器的主要设计挑战之一是松耦合变压器耦合条件的变化。这与电池充电器的大范围负载变化相结合，使得谐振DC-DC级的参数设计更加复杂。为了优化所有耦合和载荷条件下的参数设计，提出了一种参数扫描方法。设计程序搜索设置的参数，以最小化平均一次电流，同时保持一次电容上的电压应力低于预设限值；考虑了高耦合和低耦合两种情况。为了验证分析结果，建立了一个4kw谐振DC-DC样机并进行了测试。在4 cm间隙距离、耦合系数0.526时，输出功率范围为0.8 kW ~ 4 kW， DC-DC级的效率为97%。
This paper discusses the characteristics of a series-series compensated inductive power transfer system (IPT) with theoretical analysis and experimental results. To maximize system efficiency, two-stage structure, which includes a PFC stage and a resonant DC-DC stage operating in ZVS region, is proposed. One of the major design challenges in implementation of a practical contactless EV charger is the variation of the coupling condition of the loosely coupled transformer. This combined with the battery charger's wide range load variation makes parameters design of the resonant DC-DC stage more complex. To optimize the parameter design for all coupling and load conditions, a parameter sweeping method is proposed. The design procedure searches parameters set to minimize the averaged primary current while keeping the voltage stress across the primary capacitor below the preset limit; both the high coupling and low coupling conditions are considered. To validate the analysis, a 4 kW resonant DC-DC prototype was built and tested. At 4 cm gap distance with 0.526 coupling coefficient, an efficiency of 97% for the DC-DC stage was achieved with output power range from 0.8 kW to 4 kW.