Active Rectifier Design and Synchronization Control for 6.78 MHz Wireless Power Transfer
Active Rectifier Design and Synchronization Control for 6.78 MHz Wireless Power Transfer
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DOI：
10.1109/ecce44975.2020.9235386
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
Peter Pham;Spencer Cochran;D. Costinett;L. Tolbert
中科院分区：
文献类型：
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作者：
Peter Pham;Spencer Cochran;D. Costinett;L. Tolbert
在无线电力传输系统中，有源整流器显示出更高的效率和调节能力。为了实现阻抗或输出调节，确保稳定运行并最大限度地提高效率，整流器的开关动作必须与发射器线圈产生的磁场同步。本文提出了一种使用商用元器件，包括低成本微控制器来实现锁相环同步控制器的方法。利用离散小信号模型推导了固有反馈的传递函数，并设计了稳定同步环路的补偿器。采用大信号状态空间建模方法，设计了一种高效率、软开关、6.78 MHz的功率级。设计并制作了一个40W的低调GaN基整流样机，通过实验验证了其同步能力和实现软开关的高效率。
In wireless power transfer systems, active rectifiers demonstrate improved efficiency and regulation capability. To enable impedance or output regulation, ensure stable operation, and maximize the efficiency, switching actions of the rectifier have to be synchronized with the magnetic field generated from the transmitter coil. This work presents an implementation of a phase- locked-loop synchronization controller using commercial components, including a low-cost microcontroller. A discrete-time small-signal model is used to derive the transfer function of the inherent feedback and design a compensator stabilizing the synchronization loop. Large-signal state-space modeling is used to design a high-efficiency, soft-switching, 6.78MHz power stage. A low-profile, 40W, GaN-based rectifier prototype is designed and built to experimentally verify the ability to synchronize and achieve high efficiency due to soft-switching.