Abstract
Frequency splitting is a key characteristic of wireless power transfer system. With the increases of coupling coefficient, the power transferred to load drops sharply. The resonant frequency splits from one into two within splitting region. Previous reports about frequency splitting mainly focused on the analysis of coupled mode theory or the solutions of ridge equations. In this work, we presented the analytical results based on a simply T-type circuit model. With impedance analysis, the even and odd splitting frequencies were derived. In addition, the frequency splitting phenomena were analysed with output voltage curves at different coupling by the aid of simulation. Furthermore, the frequency splitting and the frequency bifurcation discussed frequently in inductively coupled wireless power transfer system were analysed comparatively based on the circuit model. Then, a half-bridge inverter based wireless power system was constructed to demonstrate the experimental results. Finally, the simulation and experimental results validated the theoretical analysis. DOI: http://dx.doi.org/10.5755/j01.eee.19.10.5455
Highlights
In recent years, the wireless power transfer (WPT) technologies have been the growing hot topics for researchers
It can be seen that when the system operates in frequency splitting region, the voltage peaks are at the odd frequency and even frequency; and at its native resonant frequency, the voltage gain curve reaches the bottom
To acquire the maximum transfer power, the WPT system should operate in high frequency, normally more than 1 MHz
Summary
The wireless power transfer (WPT) technologies have been the growing hot topics for researchers. For magnetic resonance coupling WPT systems, when moving the two coils to be close step by step and when they are close enough, the power transferred to load drop sharply. This is because the resonant frequency has been changed when the coupling of coils becomes stronger. Frequency splitting is an important issue, related to the power transfer efficiency and capability of WPT systems. In [17], an asymptotic coupled mode theory method has been used to analyse the frequency splitting phenomena in contactless power transfer systems. The discussion and conclusions are given in the Section IV
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