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J. Electromagn. Eng. Sci > Volume 16(4); 2016 > Article
Journal of Electromagnetic Engineering and Science 2016;16(4):199-205.
DOI: https://doi.org/10.5515/JKIEES.2016.16.4.199   
Reconfigurable Wireless Power Transfer System for Multiple Receivers
Sun-Han Hwang1, Chung G. Kang1, Seung-Min Lee2, Moon-Que Lee2
1Department of Electrical Engineering, Korea University
2Department of Electrical Engineering and Computer Science, University of Seoul
Correspondence:  Moon-Que Lee,Email: mqlee@uos.ac.kr
We present a novel schematic using a 3-dB coupler to transmit radiofrequency (RF) power to two receivers selectively. Whereas previous multiple receiver supporting schemes used hardware-switched methods, our scheme uses a soft power-allocating method, which has the advantage of variable power allocation in real time to each receiver. Using our scheme, we can split the charging area and focus the RF power on the targeted areas. We present our soft power-allocating method in three main points. First, we propose a new power distribution hardware structure using a FPGA (field-programmable gate array) and a 3-dB coupler. It can reconfigure the transmitting power to two receivers selectively using accurate FPGA-controlled signals with the aid of software. Second, we propose a power control method in our platform. We can variably control the total power of transmitter using the DC bias of the drain input of the amplifier. Third, we provide the possibility of expansion in multiple systems by extending these two wireless power transfer systems. We believe that this method is a new approach to controlling power amplifier output softly to support multiple receivers.
Key words: LCIPT, Multiport Amplifier (MPA), Wireless Power Transfer (WPT), 3 dB Coupler


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