Same-Sided Decoupled Electric-Field Coupler Based Wireless Power Transfer System with Multi-Transmitter and Multi-Receiver
Zhou Wei1,2, Gao Qiao1,2, Chen Zelin1,2, Mai Ruikun1,2, He Zhengyou1,2
1. Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle Ministry of Education Southwest Jiaotong University Chengdu 611756 China; 2. School of Electrical Engineering Southwest Jiaotong University Chengdu 611756 China
Abstract In recent years, with the improvement of power supply levels, electric-field coupled wireless power transfer (EC-WPT) systems with a single transmitter and single receiver cannot meet the demands of applications with different power levels. The EC-WPT system with the multi-transmitter and multi-receiver can effectively expand the output power level. For a magnetic-field coupled wireless power transfer (MC-WPT) system with the multi-transmitter and multi-receiver, there is same-sided coupling between the power transmission channels, which will affect the resonance state of the system and then decrease the transmission performance of the system. Similarly, the EC-WPT system with multi-transmitter and multi-receiver also has system detuning problems because of the coupling relationship between the power transmission channels. The MC-WPT system has two decoupling methods: the circuit decoupling method and the magnetic path decoupling method. However, the system detuning problem caused by same-sided coupling in an EC-WPT system with the multi-transmitter and multi-receiver must be addressed and effectively solved. Therefore, this paper proposes a same-sided decoupled electric-field coupler to relieve the influence of the same-sided coupling of the multi-port capacitive coupler on system resonance. First, a typical EC-WPT system with the dual transmitter and dual receiver is established. Considering the full-capacitance model of the electric-field coupler, the equivalent circuit model of the system is built based on Ansys Maxwell finite element simulation and the capacitive coupling interface modeling method with an arbitrary number of ports. Moreover, the effect of the same-sided coupling on the resonance of the system is analyzed. According to the analysis of the system impedance, EC-WPT systems with the traditional dual-transmit and dual-receive coupler cannot always keep resonant operation under a wide range of loads due to the same-side coupling. Then, the structure of the decoupled coupler based on the separate-plate is proposed, and the connecting method of all the separated plates of the coupler is explained in detail. Furthermore, the decoupling effect, decoupling principle, and coupling coefficient of the EC-WPT system with the decoupled dual-transmitter and dual-receiver coupler are demonstrated. The decoupling performance on the condition of x-misalignment and different coupling distances are analyzed. Finally, an experimental prototype with a transmission power of 200 W is built to verify the decoupling effect of the EC-WPT system with the same-sided decoupled dual-transmitter and dual-receiver coupler based on the separate-plate. The same-sided decoupled effect of the proposed electric-field coupler is verified by the comparison experiment of the same-sided decoupled effect test of the EC-WPT system based on the traditional coupler and the separate-plate coupler. In addition, the x-misalignment experiment proves that the proposed coupler still has decoupling characteristics on the condition of the coupler deviated. The EC-WPT system with dual-transmitter and dual-receiver based on decoupled coupler is constructed with 20 Ω and 200 Ω as DC loads, respectively. The experimental results show that the output voltage and current of two inverters are in phase. Compared with the power transmission experiments of the EC-WPT system based on traditional couplers and same-sided decoupled couplers under various load conditions, the transmission power and efficiency of the proposed system are higher.
Zhou Wei,Gao Qiao,Chen Zelin等. Same-Sided Decoupled Electric-Field Coupler Based Wireless Power Transfer System with Multi-Transmitter and Multi-Receiver[J]. Transactions of China Electrotechnical Society, 2023, 38(18): 4811-4822.
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2023, Vol. 38 
