A 6.78 MHz Wireless Power Transfer System for Simultaneous Charging of Multiple Receivers with Maximum Efficiency using Adaptive Magnetic Field Distributor IC

Hao Qiu, M. Takamiya
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Abstract

We developed a 6.78 MHz wireless power transfer (WPT) system for simultaneous charging of multiple receiver (RX) coils. On the basis of the transmitter (TX)-RX and RX-RX coupling distinguished by the adaptive magnetic field distributor (AMFD) IC, the distribution of magnetic fields from the TX coils was optimized at each RX coil for the maximum efficiency. A 2-TX 2-RX WPT system was implemented with the AMFD ICs fabricated in 1.8 V, 180 nm CMOS process. Compared with the conventional method, the system efficiency is increased from 8.9 % to 61 % with the load power of 173 mW.
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基于自适应磁场分配器集成电路的6.78 MHz无线电力传输系统,可实现多个接收器同时充电,效率最高
我们开发了一种6.78 MHz无线电力传输(WPT)系统,用于同时为多个接收器(RX)线圈充电。基于自适应磁场分配器(AMFD) IC识别的发射器(TX)-RX和RX-RX耦合,优化了发射器线圈在每个RX线圈上的磁场分布,以获得最大的效率。采用1.8 V、180 nm CMOS工艺制作AMFD集成电路,实现了2-TX 2-RX WPT系统。在负载功率为173 mW的情况下,与传统方法相比,系统效率由8.9%提高到61%。
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