No abstract

No abstract

No abstract

No abstract

Typical wireless power transfer systems utilize series compensation circuit which is based on magnetic coupling and resonance principles that was first developed by Tesla. However, changes in coupling caused by gap distance, alignment and orientation variations can lead to reduce power transfer efficiencies and the transferred power levels. This paper proposes impedance matched circuit to reduce frequency bifurcation effect and improve on the transferred power level, efficiency and total harmonic distortion (THD) performance of the series compensation circuit. A comprehensive mathematical analysis is performed for both series and impedance matched circuits to show the frequency bifurcation effects in terms of input impedance, variations in transferred power levels and efficiencies. Matlab/Simulink results validate the theoretical analysis and shows the circuits' THD performance when circuits are fed with power electronic converters.

No abstract

Achieving high efficiency with improved power transfer range and misalignment tolerance is the major design challenge in realizing Wireless Power Transfer (WPT) systems for industrial applications. Resonant coils must be carefully designed to achieve highest possible system performance by fully utilizing the available space. High quality factor and enhanced electromagnetic coupling are key indices which determine the system performance. In this paper, design parameter extraction and quality factor optimization of multi layered helical coils are presented using finite element analysis (FEA) simulations. In addition, a novel Toroidal Shaped Spiral (TSS) coil is proposed to increase power transfer range and misalignment tolerance. The proposed shapes and recommendations can be used to design high efficiency WPT resonator in a limited space.

Wireless power transfer (WPT) technology has been applied in a wide range of applications. However, directly comparing dissimilar designs with respect to PTE and transfer distance is misleading due to the differences in the design parameters. The term normalized distance has been proposed to compare diverse designs with different coil sizes and transfer distances. This paper presents an analysis on normalized distance and scalability of WPT systems considering maximum power transfer efficiency, transmitter (Tx) and receiver (Rx) coil radii and transfer distance. Merits of normalized distance and its limitations are investigated. Results in this paper propose to define more generalize term for normalized distance incorporating transfer distance, Tx and Rx coil radii, ratio between Tx, Rx coil radii and number of turns in each coil.