Abstract
This article presents the results of the proposed numerical and analytical analysis of the Wireless Power Transfer System (WPT). The system consists of a transmitting surface and a receiving surface, where each of them is composed of planar spiral coils. Two WPT systems were analysed (periodic and aperiodic) considering two types of coils (circular and square). In the aperiodic system, the adjacent coils were wound in the opposite direction. The influence of the type of coils, the winding direction, the number of turns, and the distance between the coils on the efficiency of the WPT system was compared. In periodic models, higher efficiency was obtained with circular rather than square coils. The results obtained with both proposed methods were consistent, which confirmed the correctness of the adopted assumptions. In aperiodic models, for a smaller radius of the coil, the efficiency of the system was higher in the square coil models than in the circular coil models. On the other hand, with a larger radius of the coil, the efficiency of the system was comparable regardless of the coil type. When comparing both systems (periodic and aperiodic), for both circular and square coils, aperiodic models show higher efficiency values (the difference is even 57%). The proposed system can be used for simultaneous charging of many sensors (located in, e.g., walls, floors).
Highlights
The traditional charging of devices with cables and wires turned out to be very lossy, difficult to install, and subject to frequent breakdowns [1]
The energy transmission from the source to the load should primarily concern active energy, which over time is directly related to the voltage at the load terminals as well as the current resulting from the voltage and the load response
The calculations of the exemplary wireless power transfer (WPT) systems were made in the frequency range from 0.1 MHz to 1 MHz
Summary
The traditional charging of devices with cables and wires turned out to be very lossy (approx. 30%), difficult to install, and subject to frequent breakdowns [1]. The authors propose and study a numerical and analytical model that can be used to analyse the power transmission conditions in the presented WPT systems. The calculations of the exemplary WPT systems were made in the frequency range from 0.1 MHz to 1 MHz. The calculations of the exemplary WPT systems were made in the frequency range from 0.1 MHz to 1 MHz Using both proposed methods, the authors analysed the impact of the type of coils, the winding direction, and geometric parameters (coil radius, number of turns, and distance between the coils) on the power transfer efficiency.
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