Abstract
A foreign metal object will deteriorate the performance of wireless power transfer (WPT) systems and cause insecurity issues. Therefore, the influence principles and rules of foreign metal objects on soft-switching conditions of Class-E inverters and the performance of WPT systems are developed in this paper. The effects of different metal materials on coil parameters at different frequencies and positions are analyzed first, then the effects of foreign metal objects on soft-switching conditions of Class-E inverters and the power transfer capability of WPT systems are investigated. Principle analyses and simulation results demonstrate that there are significantly different effects on the soft-switching conditions and power transfer when a foreign metal object is placed near the transmitter coil or the receiver coil. In addition, the monotonicity of the variation in power transfer also depends on the position of the foreign metal object. Finally, a WPT experimental prototype with a Class-E inverter is implemented to verify the influence principles and rules of foreign metal objects. The experimental results are highly consistent with the principle analyses and simulation results.
Highlights
With the continuous development of wireless power transfer (WPT) technology and its commercialization process, its security issues attract more and more attention [1,2,3,4]
The influences of different metal materials on coil parameters at different frequencies and different positions have been analyzed, and the influence principles and rules of foreign metal object on soft-switching conditions of the Class-E inverter and power transfer of the WPT system have been developed as follows: When a foreign metal object is placed at the receiver side, the soft-switching conditions can be maintained, but the power transfer is less than the nominal value and decreases monotonically as the foreign metal object approaches the receiver coil
When the foreign metal object is placed near the transmitter coil, the soft-switching conditions will be invalid
Summary
With the continuous development of wireless power transfer (WPT) technology and its commercialization process, its security issues attract more and more attention [1,2,3,4]. The variation of the coil parameters caused by a foreign metal object will change the resonant frequency of the system [6,9], thereby deteriorating the transfer efficiency. The experiment results that the soft-switching conditions of the Class-E inverter will be or a foreign metal object. Fact, all of the papers only consider theefficiency thermal decrease when a foreign metal object is involved in the WPT insteadinfocus on the FOD heating issue and the efficiency decrease when a foreign metalsystem, object isand involved the WPT system, method without discussing the impacts of the metal object on the WPT system’s performance, such and instead focus on the FOD method without discussing the impacts of the metal object on the WPT as soft-switching conditions and power transfer capacity.and. Considering particular metal material, since all of them similar effect at high frequency, effects ofthe a one kind of particular metal material, since have all ofathem have a similar effect at highthe frequency, foreign metal objectmetal on theobject soft-switching conditions ofconditions the Class-E is presented inpresented
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