Load- and Position-Independent Moving MHz WPT System Based on GaN-Distributed Current Sources
Load- and Position-Independent Moving MHz WPT System Based on GaN-Distributed Current Sources
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DOI：
10.1109/tmtt.2017.2768031
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发表时间：
2017-12-01
影响因子：
4.3
通讯作者：
Mitcheson, Paul D.
中科院分区：
文献类型：
--
作者：
Pacini, Alex;Costanzo, Alessandra;Mitcheson, Paul D.
本文描述了一种用于工业移动应用的完整(DC-DC)感应无线功率传输(WPT)系统的建模、分析和设计。该系统工作在6.78 MHz，向沿线性路径移动的负载提供高达150W的功率，提供准恒定的直流输出电压，并保持零电压开关操作，不受位置和负载的影响，没有任何回调或反馈。该感应链路由固定的发射线圈阵列和移动的接收线圈组成，其长度被优化以实现沿路径的恒定耦合系数。每个TX线圈分别由恒幅和恒相正弦电流驱动，该电流由基于GaN的耦合负载独立EF类逆变器产生。根据接收器的位置，在给定的时间激活两个相邻的发射器；这有效地在两个发射线圈之间创建了虚拟串联连接。Rx线圈连接到无源E类整流器，该整流器旨在保持恒定的直流输出电压，而不受负载和位置的影响。给出了广泛的实验结果，展示了在不同加载条件和位置下的性能。在100W的直流输出功率下，DC-DC转换效率达到了80%的峰值，在30-500欧加的负载范围内，直流输出电压的变化小于5%。本文的工作是为工业自动化工厂中的滑块和质量移动器提供高效、免维护和可靠的WPT系统的设计解决方案。
This paper describes the modeling, analysis, and design of a complete (dc-to-dc) inductive wireless power transfer (WPT) system for industrial moving applications. The system operates at 6.78 MHz and delivers up to 150 W to a load moving along a linear path, providing a quasi-constant dc output voltage and maintaining a zero voltage switching operation, regardless of position and load, without any retuning or feedback. The inductive link consists of an array of stationary transmitting coils and a moving receiving coil whose length is optimized to achieve a constant coupling coefficient along the path. Each Tx coil is individually driven by a constant amplitude and phase sinusoidal current that is generated from a GaN-based coupled load-independent Class EF inverter. Two adjacent transmitters are activated at a given time depending on the receiver's position; this effectively creates a virtual series connection between the two transmitting coils. The Rx coil is connected to a passive Class E rectifier that is designed to maintain a constant dc output voltage independent of its load and position. Extensive experimental results are presented to show the performance over different loading conditions and positions. A peak dc-to-dc efficiency of 80% is achieved at 100 W of dc output power and a dc output voltage variation of less than 5% is measured over a load range from 30 to 500 Omega. The work in this paper is foreseen as a design solution for a high-efficient, maintenance-free, and reliable WPT system for powering sliders and mass movers in industrial automation plants.