Abstract
This paper presents the design and implementation of a Class EF $_2$ inverter and Class EF $_2$ rectifier for two -W wireless power transfer (WPT) systems, one operating at 6.78 MHz and the other at 27.12 MHz. It will be shown that the Class EF $_2$ circuits can be designed to have beneficial features for WPT applications such as reduced second-harmonic component and lower total harmonic distortion, higher power-output capability, reduction in magnetic core requirements and operation at higher frequencies in rectification compared to other circuit topologies. A model will first be presented to analyze the circuits and to derive values of its components to achieve optimum switching operation. Additional analysis regarding harmonic content, magnetic core requirements and open-circuit protection will also be performed. The design and implementation process of the two Class-EF $_2$ -based WPT systems will be discussed and compared to an equivalent Class-E-based WPT system. Experimental results will be provided to confirm validity of the analysis. A dc–dc efficiency of 75% was achieved with Class-EF $_2$ -based systems.
Highlights
T HE research in the wireless power transfer (WPT) field covers a wide range of topics and areas such as circuit topologies, device technologies and component packaging, coils and magnetic designs, control and system optimization methods, tuning and impedance matching techniques, development of accurate simulation models, and compliance with EMI regulations
This paper presented the analysis, design process, and implementation of a Class-EF2 inverter and a Class-EF2 rectifier topology for WPT systems that operate at multimegahertz frequencies
A detailed mathematical analysis was performed on the Class-EF2 topology to derive its component parameters for optimum switching conditions and other performance parameters such as voltage and current stresses, power-output capability, and harmonic content
Summary
T HE research in the wireless power transfer (WPT) field covers a wide range of topics and areas such as circuit topologies, device technologies and component packaging, coils and magnetic designs, control and system optimization methods, tuning and impedance matching techniques, development of accurate simulation models, and compliance with EMI regulations. One of the key interests in WPT technology is to increase the frequency of operation from the kilohertz range to the megahertz range to improve the tolerance to misalignment by allowing ferrite cores to be removed. A higher frequency increases the reflected resistance seen by the primary coil driver, power can be transferred at reduced current stresses. Similar to switched-mode power supplies, the additional benefits of operating at multimegahertz switching frequencies such as the ISM bands 6.78, 13.56, and 27.12 MHz are reduc-.
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