Wireless Power Transfer for Battery Powering System

Abstract

The LCL topology (formed by an LC tank with a transmitting coil) is extensively utilized in wireless power transfer (WPT) systems with the features of a constant resonant current and ability to disconnect load abruptly. However, it requires high input voltage, which limits its utilization in battery powering scenarios (12~24 V). A current-fed inverter (CFI) is applied to the LCL-S (a compensation capacitor in series with the receiving coil) WPT systems to boost the input voltage, thereby getting a higher resonant current in the transmitting side (Tx). To facilitate the voltage regulation in the receiving side (Rx), a semi-active bridge (SAB) is introduced into the system, which further boosts the output voltage by a lower frequency switching at different duty ratios. Rigorous mathematical analysis of the proposed system is carried out and design guidelines are subsequently derived. Moreover, a power loss reduction is realized by zero voltage switch (ZVS) of the four switches in the Tx which are deduced and presented. Simulations and experiments are added to verify the proposed system. Consequently, a 93.3% system efficiency (DC-to-DC efficiency) is obtained using the proposed topology. Optimization techniques for a higher efficiency are included in this study.

Design and Optimization of Structure of Tower-Type Coil in Wireless Charging System for Electric Vehicles

“…An impedance analyzer is used to extract the parameters in Eqs. (7) and (8). The original resonant frequency is set to 85.0 kHz.…”

“…Compared to the wired charging mode of EVs, the convenience of wireless charging using magnetic resonance can make EVs more acceptable to drivers because they do not need to handle power plug. At the same time, EVs system using wireless charging mode can be safer [5][6][7].…”

Design of A Series Resonant Converter GMAW Welding Machine by Using the Harmonic Current Technique for Power Transfer

“…At the end of the first pulses these modes end, and circulation modes start. In circulation modes pulses continue to flow through the load [18].…”

“…At the end of the first pulses these modes end, and circulation modes start. In circulation modes pulses continue to flow through the load [18]. Figure 8 shows the output voltage waveforms of the H-bridge (v bri ) and its harmonic components.…”

A Fractional-Order Element (FOE)-Based Approach to Wireless Power Transmission for Frequency Reduction and Output Power Quality Improvement

“…[10] showed that magnetic resonant coupling WPT normally works in megahertz and its efficiency is improved with increasing frequency. Despite its long-lasting popularity, using coils to achieve WPT through high-frequency actions cannot satisfy today's needs, and power electronics elements are being developed to realize the same function [11]. However, it is well known that current power electronics technologies cannot satisfy such high-frequency switching [12]; therefore, in order to meet the capability of contemporary power switches to realize WPT, it is of great necessity to propose new methods for reducing the resonant frequency.…”