Abstract
The analysis of capacitive wireless power transfer was conducted in a general manner. The circuit model of a capacitive wireless power transfer chain was presented. The derivation of the power transfer efficiency through the chain in question as well as the active power delivered to the appliance terminating this chain was shown. Both the case of the maximal efficiency and the one of the maximal appliance power were treated and conditions for these optima were found in both cases. The appliance power corresponding to the maximal efficiency and the efficiency corresponding to the maximal appliance power were also expressed. The total admittance of the capacitive wireless power transfer chain was calculated. For both optimal conditions, the appliance power and total admittance were written in the normalized form, which enabled to express them as functions of single variable in the same way as the efficiency.
Highlights
The paper deals with a general rigorous circuit analysis of a wireless power transfer (WPT) chain, which realizes the WPT with the help of capacitive coupling
The analysis of capacitive wireless power transfer was conducted in a general manner
The derivation of the power transfer efficiency through the chain in question as well as the active power delivered to the appliance terminating this chain was shown
Summary
The paper deals with a general rigorous circuit analysis of a wireless power transfer (WPT) chain, which realizes the WPT with the help of capacitive coupling. The adaptors form electromagnetic field with the help of suitable coupling elements They contain matching networks and typically frequency converters because suitable frequencies for transfer through the medium differ from suitable frequencies for the source and appliance. General block scheme of WPT chain (FC – Frequency Converter, MN – Matching Network, CE – Coupling Element). The analysis of the CWPT chain presented in this paper generalizes the results from [7]–[10]. It is developed as the dual case to the analysis of the IWPT chain [13].
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