A Novel WPT System Based on Dual Transmitters and Dual Receivers for High Power Applications: Analysis, Design and Implementation

Abstract

Traditional Wireless Power Transfer (WPT) systems only have one energy transmission path, which can hardly meet the power demand for high power applications, e.g., railway applications (electric trains and trams, etc.) due to the capacity constraints of power electronic devices. A novel WPT system based on dual transmitters and dual receivers is proposed in this paper to upgrade the power capacity of the WPT system. The reliability and availability of the proposed WPT system can be dramatically improved due to the four energy transmission paths. A three-dimensional finite element analysis (FEA) tool ANSYS MAXWELL (ANSYS, Canonsburg, PA, USA) is adopted to investigate the proposed magnetic coupling structure. Besides, the effects of the crossing coupling mutual inductances among the transmitters and receivers are analyzed. It shows that the same-side cross couplings will decrease the efficiency and transmitted power. Decoupling transformers are employed to mitigate the effects of the same-side cross couplings. Meanwhile, the output voltage in the secondary side can be regulated at its designed value with a fast response performance, and the system can continue work even with a faulty inverter. Finally, a scale-down experimental setup is provided to verify the proposed approach. The experimental results indicate that the proposed method could improve the transmitted power capacity, overall efficiency and reliability, simultaneously. The proposed WPT structure is a potential alternative for high power applications.

An Overview of Resonant Circuits for Wireless Power Transfer

“…With the objectives to achieve no power cables, no sparking hazards, better convenience and high flexibility, wireless power transfer (WPT) has attracted considerable attention in many industrial applications and interdisciplinary areas [1][2][3]. As one of the most prominent technologies, the WPT is changing the conventional usage of energy in daily life for human being.…”

A Three-Phase Dynamic Wireless Charging System with Constant Output Voltage

“…The wireless power transfer (WPT) has many advantages compared with wired charger technology (e.g., opportunity charging, safety, immunity to ice, water, spark and other chemicals), [2,3] which makes WPT an ideal charging implementation in mobile phones, pacemakers and underwater robots [4,5].…”

Analysis and Design of a Wireless Power Transfer System with Dual Active Bridges

“…Ze is the equivalent impedance, whose real part and imaginary part are denoted as Re and Xe, respectively. The primary resonant angular frequency ω1, the secondary resonant angular frequency ω2, the primary reactance X1, and the secondary reactance X2 are defined as: Uncontrolled rectification is utilized in most WPT systems [7,9,12,24]. The analysis presented is based on full load conditions and the output filtering capacitor is supposed to be large enough to maintain a stable output DC voltage.…”

“…Uncontrolled rectification is utilized in most WPT systems [7,9,12,24]. The analysis presented is based on full load conditions and the output filtering capacitor is supposed to be large enough to maintain a stable output DC voltage.…”