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Joint Power Routing and Current Scheduling in Multi-Relay Magnetic MIMO WPT System

机译:多继电器磁性MIMO WPT系统中的关节电源路由和电流调度

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Magnetic resonant coupling wireless power transfer (MRC-WPT) enables convenient device-charging. When MIMO MRC-WPT system incorporated with multiple relay components, both relay On-Off state (i.e., power routing) and TX current (i.e., current scheduling) could be adjusted for improving charging efficiency and distance. Previous approaches need the collaboration and feedback from the energy receiver (RX), achieved using side-channels, e.g., Bluetooth, which is time/energy-consuming. In this work we propose, design, and implement a multi-relay MIMO MRC-WPT system, and design an almost optimum joint optimization of power routing and current scheduling method, without relying on any feedback from RX. We carefully decompose the joint optimization problem into two subproblems without affecting the overall optimality of the combined solution. For current scheduling subproblem, we propose an almost-optimum RX-feedback independent solution. For power routing subproblem, we first design a greedy algorithm with 1/2 approximation ratio, and then design a DQN based method to further improve its effectiveness. We prototype our system and evaluate it with extensive experiments. Our results demonstrate the effectiveness of the proposed algorithms. The achieved power transfer efficiency (PTE) on average is 3.2X, 1.43X, 1.34X, and 7.3X over the other four strategies: without relay, with non-adjustable relays, greed based, and shortest-path based ones.
机译:磁共振耦合无线电源转移(MRC-WPT)可实现方便的设备充电。当MIMO MRC-WPT系统与多继电器组件结合起来时,可以调整继电器开关状态(即,电源路由)和TX电流(即,电流调度)以提高充电效率和距离。以前的方法需要使用侧通道实现的能量接收器(Rx)的协作和反馈,例如蓝牙,这是时间/能量的。在这项工作中,我们建议,设计和实施多继电器MIMO MRC-WPT系统,并设计了电源路由和电流调度方法的几乎最佳的关节优化,而无需依赖RX的任何反馈。我们仔细地将联合优化问题分解为两个子问题,而不会影响组合解决方案的整体最优性。对于当前调度子问题,我们提出了一个近似最佳的RX反馈独立解决方案。对于电力路由子问题,我们首先设计具有1/2近似比的贪婪算法,然后设计基于DQN的方法,以进一步提高其有效性。我们使用广泛的实验来对我们的系统进行原型并评估它。我们的结果表明了所提出的算法的有效性。实现的电力传输效率(PTE)平均为3.2倍,1.43倍,1.34倍,7.3倍,其他四种策略:无继电器,具有不可调节的继电器,贪婪和基于最短的路径。

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