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Design of a wireless charging system with a phase-controlled inverter under varying parameters

机译：参数可变的相控逆变器无线充电系统设计

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摘要

Class-D full bridge is the most common inverter topology at the primary side for wireless electric vehicles (EVs) charging systems. This study takes a novel topology of a phase-controlled inverter as the power amplifier and puts it in a context of the whole charging system. The proposed inverter topology regulates the charging power through adjusting the phase-shift angle among phases with a constant operating frequency, which alleviates the EMI filter design. For various wireless EVs chargers, the gaps between the primary side and the secondary side are changing, which results in various coupling factors k. The equivalent resistance of the EVs battery Rbattery is also changing during the charging process. Even resonant frequencies at two sides are variable because of the components tolerances and operating environments. This study presents design considerations of a wireless EVs charging system with the proposed technology under variable k, Rbattery, and resonant frequencies. Circuit parameters are designed and the system efficiency is derived. Industrial prototype of an EV charging system is manufactured with the proposed topology at 3.0 kW. Experiments show that these design considerations can reflect the system characteristics, and the proposed system is a good candidate to be used in wireless EV battery chargers.
机译：D级全桥是无线电动汽车（EV）充电系统最常见的逆变器拓扑。这项研究采用了相控逆变器的新型拓扑作为功率放大器，并将其置于整个充电系统的环境中。所提出的逆变器拓扑结构通过以恒定的工作频率调整各相之间的相移角来调节充电功率，从而减轻了EMI滤波器的设计。对于各种无线电动汽车充电器，一次侧和二次侧之间的间隙不断变化，这导致各种耦合系数k。电动汽车电池Rbattery的等效电阻在充电过程中也会发生变化。由于组件的公差和工作环境，甚至两侧的谐振频率也是可变的。这项研究提出了在可变k，Rbattery和谐振频率下采用拟议技术的无线EV充电系统的设计考虑。设计电路参数并得出系统效率。 EV充电系统的工业原型以建议的3.0 kW拓扑结构制造。实验表明，这些设计考虑因素可以反映系统特性，并且所提出的系统是用于无线EV电池充电器的良好候选者。

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