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This paper gives an overview of current wireless charging technologies on electric vehicles (EVs) charging. In general, the near-field technologies are preferred over far-field ones. Inductive power transfer and strongly coupled magnetic resonance technologies are chosen for detailed review. Furthermore, special issues related to EV applications are also discussed, namely efficient power supply, misalignment tolerance, multiple pickup control, simultaneous power and data transmission and shielding methods.

Given the increasing demand to increase the switching frequency and efficiency of switched-mode power converters, pulse-width-modulated (PWM) soft-switching techniques have been proposed to combine the desirable features of PWM and resonant-mode converters. This paper presents the evolution of several soft-switching techniques, operating principles, performance characteristics, experimental results, merits and limitations are also discussed. Experimental results of three classes of zero-voltage-switched converters and one class of zerocurrent-switched converter are prototyped and presented.

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This paper presents the quantitative analysis for the optimal design of wireless power transmission (WPT) systems based on magnetic resonant coupling (MRC) mechanism. In this paper, the exemplified MRC-based WPT system adopts the series-series topology and one resonant coil, which shows that the energy efficiency and transferred power are both significantly affected by the mutual inductance of the primary-resonant coils and the resonant-secondary coils. In addition, the simulated and experimental results are both provided to illustrate the influence of the mutual inductance on the performance of MRC-based WPT systems regulating the relative displacement among coils. Thus, this quantitative analysis can offer the significant theoretical and experimental basis for the optimal design of MRC-based WPT systems in various application fields.Index Terms-Magnetic field analysis, magnetic resonant coupling (MRC), optimization, wireless power transmission (WPT).

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