Abstract
In this paper, an automated impedance matching circuit is proposed to match the impedance of the transmit and receive resonators for optimum wireless power transfer (WPT). This is achieved using a 2D open-circuited spiral antenna with magnetic resonance coupling in the low-frequency ISM band at 13.56 MHz. The proposed WPT can be adopted for a wide range of commercial applications, from electric vehicles to consumer electronics, such as tablets and smartphones. The results confirm a power transfer efficiency between the transmit and receive resonant circuits of 92%, with this efficiency being sensitive to the degree of coupling between the coupled pair of resonators.
Highlights
Traditional vehicles based on fossil fuels are beginning to be replaced with electric vehicles (EV), to circumvent climate change and reduce carbon footprints [1,2,3]
We propose a high efficiency wireless power transfer system, using a magnetic resonance coupling system
The results show that when the gap is relatively small the strong coupling creates four distinct resonance ripples, which contribute towards optimizing the wireless power transfer (WPT) efficiency
Summary
Traditional vehicles based on fossil fuels are beginning to be replaced with electric vehicles (EV), to circumvent climate change and reduce carbon footprints [1,2,3]. It has been shown that a higher efficient can be achieved using magnetic resonance coupling. This means that for such a system to be practically viable, resonance parity must be maintained independently of the gap, to maintain the efficiency performance of the WPT system In this context, various studies have shown that resonance conditions can be maintained using techniques such as (i) impedance matching [7], (ii) frequency matching [10], and (iii) manipulation of coupling [11]. The wireless power transfer via magnetic resonance coupling in [13] offers the prospect of autonomously charging connected devices. This was achieved using a surface routing approach, which was found to be more efficient than linear routing. We propose a high efficiency wireless power transfer system, using a magnetic resonance coupling system. The reflection ratio (η11) and the transmission ratio (η21) are defined in [1] and shown in Equations (7) and (8), where S11 and S21 represent the reflection and transmission coefficients, respectively
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