Abstract
This paper deals with in loop design of coupling elements of the wireless charging systems (WChS). The in-loop design is created as a script/User Interface (UI) in MATLAB environment, which is based on finite element models of WChS. Main aim of developed tool is to easily identify the optimal geometrical parameters of the coupling coils. The optimization of the coil’s geometrical and electrical parameters is specified by an algorithm, which is based on definition for transfer of required amount of power and on geometrical restrictions of the target application. The second part of the proposed script/UI is used for user guided design of the electromagnetic shielding. It enables to optimize the shielding parameters in order to reach the limits defined by international standards for safety levels with respect to human exposure. Proposed design methodology together with user interface have been verified though experimental validation. For this purpose, construction of WChS was realized based on the results from in loop design process. Comparisons have been made according to the evaluation of simulation model´s accuracy, that is, the values of self-inductances, mutual inductances, coupling coefficient and gain characteristics have been evaluated (simulations vs. experiments). At the end of the paper the evaluation of the shielding performance was realized, while once more the comparison between simulation and experiments have been made. Received results are showing less than 2% of the relative error. Using presented methodology, the fast optimization actions can be done during design and modelling of WChS.
Highlights
In addition to the regulations on wireless charging and its commercialization, it is necessary to consider several other important technical issues in the design of the system
The accuracy of FEM model and in loop design procedure were verified by comparing the characteristics of the relevant coupling coil system suited for practical experimentations of wireless charging systems (WChS)
Within horizontal plane, limiting threshold is achieved at the 36 cm from the side of the coil. Both results confirm very high accuracy and reliability of the proposed in Experimental measurement using laboratory test stand was focused on the determination of the loop design methodology and simulation model as well
Summary
In addition to the regulations on wireless charging and its commercialization, it is necessary to consider several other important technical issues in the design of the system. Proposed model can provide preciseand magnetic intensities to regulations), faster and moreand accurate determination of operation information related related to magnetic fields distribution (electric magnetic intensities related to conditions (i.e., efficiency, peak power, transfer distance, component stresses). The mentioned model (Figure 2.) is fully reconfigurable in following ways: Coil Geometry/Material Parameters. The model itself dividedofto four sub models, which are used for wireless charging electromagnetic field is radiation designed system of coupling elements, while these main resultssystem are optimization. Using the value of nominal load of the system and considering efficiency of the power transfer it is possible to determine maximal admissible parasitic resistance of the coil (Rcoil ) (6). The conditions listed above (9)–(11) determines, that the calculation of the coils geometry is optimized to reach defined requirements on the efficiency and on the amount of the transferred power. Mentioned equations are representing basic set of mathematical expressions, which are being used within proposed modelling approach
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