Analysis and Design of Compensation Network for Two-Coil Wireless Power Transfer System with Variable Constant Voltage Gain Characteristics
Zhang Pengfei1, Gong Lijiao1,2, Ma Xinxin1, Yang Tong1, Huang Bo3
1. College of Mechanical and Electrical Engineering Shihezi University Shihezi 832003 China; 2. Xinjiang Production & Construction Corps Key Laboratory of Advanced Energy Storage Materials and Technology Shihezi University Shihezi 832003 China; 3. Xinjiang TianFu Energy Co., Ltd Shihezi 832000 China
Abstract Compared with the multi-coil structure, the two-coil wireless power transfer (WPT) system shows shortcomings in transmission distance and transmission efficiency, but the transmission characteristics of the WPT system can be improved by increasing the order of the compensation network and the active control strategy. Different from the design of compensation network, the research of active control strategy has the problems of large system complexity and high control cost. Therefore, combined with the transformer T network model, this paper proposes a new method for compensating network parameters and transmission characteristics analysis of a two-coil WPT system with variable gain constant voltage characteristics, which lays a research foundation for multi-node WPT technology of sensor networks. Firstly, the equivalent model of transformer T-network is established, and the element parameter expression of S-S two-coil WPT system with constant voltage characteristic is given. Secondly, the new parameters-equivalent coupling coefficient kr and equivalent variable ratio n1 are defined, and a new method for determining the compensation network parameters of SP-S and SP-PS compensation structures with variable gain and constant voltage characteristics is proposed. Then, considering the direct influence of system parasitic resistance on transmission characteristics, the variation trend of voltage gain stability with equivalent parameters under coil offset and frequency oscillation is analyzed, and the optimal equivalent parameter expression under coil offset is derived. Finally, the experimental prototypes of two-coil WPT system with S-S, SP-S and SP-PS compensation structures are built to verify the correctness and effectiveness of the variable gain constant voltage output characteristics and analysis conclusions of the proposed system. Through theoretical analysis and experimental verification, the following conclusions can be drawn: (1) The proposed new design method of two-coil WPT system’s compensation network makes the output voltage gain of WPT system meet the target variable ratio, simplifies the parameter design method, increases the degree of freedom of system design, and makes the parameter selection more flexible. (2) The two-coil WPT system under coil offset will increase first and then decrease with the increase of equivalent variable ratio n1, and will also show the same trend with the increase of equivalent coupling coefficient kr. (3) Considering the direct influence of the parasitic resistance of the system on the transmission characteristics, the optimal equivalent parameter expression of WPT system with or without parallel resonant element CL under coil offset is obtained. (4) The transmission efficiency of the steady-state WPT system increases first and then decreases with the increase of n21, the two-coil WPT system with CL increases first and then decreases with the increase of the equivalent coupling coefficient kr, and the WPT system without CL increases first and then decreases with the increase of k2r.
Zhang Pengfei,Gong Lijiao,Ma Xinxin等. Analysis and Design of Compensation Network for Two-Coil Wireless Power Transfer System with Variable Constant Voltage Gain Characteristics[J]. Transactions of China Electrotechnical Society, 2024, 39(5): 1256-1269.
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2024, Vol. 39 
