Abstract
This article presents a method for analysis of the low-power periodic Wireless Power Transfer (WPT) system, using field and circuit models. A three-dimensional numerical model of multi-segment charging system, with periodic boundary conditions and current sheet approximation was solved by using the finite element method (FEM) and discussed. An equivalent circuit model of periodic WPT system was proposed, and required lumped parameters were obtained, utilizing analytical formulae. Mathematical formulations were complemented by analysis of some geometrical variants, where transmitting and receiving coils with different sizes and numbers of turns were considered. The results indicated that the proposed circuit model was able to achieve similar accuracy as the numerical model. However, the complexity of model and analysis were significantly reduced.
Highlights
In the present days, we have observed a growing number of devices operating due to wireless power transfer (WPT) technology [1], which became more available in extensive scattered grids of many interdependent sources and loads [2]
Current trends in wireless charging of electric vehicles [3,4] and modern electronics [1,5,6] have led to the development of the inductive power transfer (IPT) concept
On the the basis basis of of structure of the WPT cell; it was a reference for the simplified circuit model
Summary
We have observed a growing number of devices operating due to wireless power transfer (WPT) technology [1], which became more available in extensive scattered grids of many interdependent sources and loads [2]. WPT is considered to be an alternative method of charging wireless devices, where a pair of coils [7,9] (accompanied with additional intermediate coils [10,11]) or an array of coils [12,13,14] is utilized. Multi-coil systems operate at high frequencies (f ≥ 1 MHz) [13,15], and in some cases, power transfer is assisted by using metamaterial structures [14]. For low frequencies (f < 1 MHz), an array of coils as domino form resonators [16] and linear resonator arrays [17,18] are considered, where in intermediate space between transmitter and receiver, energy transfer is assisted by using several resonators. A detailed analysis was performed for a series configuration of resonators, while parallel-series topology of planar coils, acting as group of energy transmitters and receivers, are still not fully developed
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