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Energies 2019, 12(6), 1017; https://doi.org/10.3390/en12061017

The Design and Optimization of a Wireless Power Transfer System Allowing Random Access for Multiple Loads

1
School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
2
Zhifang Engineering Design Co. Ltd., Nanjing 210014, China
3
Key Laboratory of Smart Grid Technology and Equipment in Jiangsu Province, No. 2, Sipailou Street, Nanjing 210096, China
4
State Grid China Electric Power Research Institute, Beijing 100192, China
5
State Grid Yancheng Power Supply Company, No. 189, Jiefang South Road, Yancheng 224000, China
*
Author to whom correspondence should be addressed.
Received: 12 January 2019 / Revised: 12 March 2019 / Accepted: 12 March 2019 / Published: 15 March 2019
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Abstract

As is common in multi-load wireless power transfer (WPT) systems based on series–series compensation topology, the power received by loads and the efficiency of the process are highly sensitive to changes in the number of loads. To guarantee that the power supplied to a load remains stable when other loads access or leave the system, we propose an improved multi-load system for WPT. The new system uses an LCC/S topology (based on inductor–capacitor–inductor or LCL topology) to keep the power received by the loads stable. By comparing two scenarios (ideal and real models based on LCC/S topology), we aim to eliminate cross-coupling between receiving coils by connecting compensating capacitors in series on the receiving side. In this way, the stability of the power received by loads is further improved. Moreover, a method of optimizing control over the efficiency is proposed based on the effect on the overall efficiency of impedance and number of loads. This allows us to optimize the overall efficiency of the system. Finally, a system to verify our theoretical analysis is established and used to show the validity and effectiveness of the proposed system. View Full-Text
Keywords: wireless power transfer (WPT); multiple loads; LCC/S topology; efficiency optimization; power stabilization wireless power transfer (WPT); multiple loads; LCC/S topology; efficiency optimization; power stabilization
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Tan, L.; Zhang, M.; Wang, S.; Pan, S.; Zhang, Z.; Li, J.; Huang, X. The Design and Optimization of a Wireless Power Transfer System Allowing Random Access for Multiple Loads. Energies 2019, 12, 1017.

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