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《The World of Inverters》 2009-08
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Study on Frequency-tracking Wireless Power Transfer System by Resonant Coupling

Fu Wenzhen Zhang Bo Qiu Dongyuan  
Detuning is the application barrier of resonant coupling wireless power transfer. This paper analyzes effects about inductance variations of launch coil and receiving coil to wireless transmission efficiency based on its transmission mechanism and model,and also analyzes its detuning mechanism.Thus,it reveals that inductance of launch coil changing is one of the main influencing factors of transmission efficiency.In order to make sure that wireless power transfer by resonant coupling operates without detuning,a new method of frequency tracking control is came up with,which is,making frequency of transmitting power source tracking with the nature frequency of launch resonant circuit automaticllly. Hence,it avoids detuning and improves transmission efficiency greatly.Finally,a prototype of 1MHz wireless power transfer system by resonant coupling was made.Experimental results prove this method very well.
【Fund】: 国家自然科学基金(50877028);; 广东省自然科学基金重点项目(8251064101000014);; 国家863高技术基金项目(2007AA05Z200);; 国家科技支撑计划(2008BAF34B09)
【CateGory Index】: TN751
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