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| Study on Boundary Condition of Wireless Power Transfer System Based on Envelope Modulation |
| Sun Yue, Zhang Lu, Wang Zhihui, Dai Xin, Jiang Cheng |
| College of Automation Chongqing University Chongqing 400030 China |
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Abstract Compared to the traditional wireless power transfer (WPT) system, the wireless power transfer system based on envelope modulation has the advantages of simple structure and convenient control. However, the conditions such as the initial parameters and load variation will severely affect the oscillatory condition and the high frequency electric energy envelope quality of the wireless power transfer system based on envelope modulation. Thereby, the power transmission and the quality of load power would be affected inevitably. Based on ac impedance analysis method, zero current switching (ZCS) control technology was used to analyze the system state variables in time domain. The boundary for oscillatory condition and the zero-valley value of the energy envelope of system were obtained based on the discrete iteration method. Then, the operating boundary condition for wireless power transfer system based on envelope modulation was derived. Simulation and experimental results illustrate that the system always operates in resonant soft-switching state and keeps good quality of high frequency electric energy envelope within the scope of the boundary conditions. The results prove the validity of the theoretical analysis.
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Published: 10 October 2017
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| Fund:科技部国家863计划主题项目（2015AA016201）和国家自然科学基金（51377183）资助 |
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2017, Vol. 32 
