Analysis and Optimization of Three-Resonator Wireless Power Transfer System for Predetermined-Goals Wireless Power Transmission

Abstract

Three-resonator wireless power transfer (WPT) systems have been proposed to improve the power transfer efficiency (PTE) and power delivered to the load (PDL) in recent years. However, analysis formulas of a three-resonator WPT system are complicated, and the parameters for clarifying the transfer characteristics of this system are difficult to extract. In this paper, concise formulas for analyzing PTE and PDL of the three-resonator system are derived by introducing three factors. Diagram discriminance based on the derived formulas is proposed to obtain the frequency splitting criterions of PTE and PDL in this system. Further, at the transfer distances, where the PTE and PDL are low at original frequency due to frequency splitting phenomenon, the two predetermined-goals of maximizing PTE and PDL are achieved by optimizing coupling strength between the three resonators. The third predetermined-goal of obtaining a constant amount of PDL transfer at maximum PTE is also implemented based on basic algorithms in numerical software. Finally, Simulation and measurement results verify the correctness of analyzing the transfer characteristics of three-resonator WPT system using the presented concise formulas and discriminance. Moreover, effectiveness of realizing the three predetermined-goals via the proposed optimization method is confirmed with experiments.

Efficiency Analysis of Multiple-Transmitter Wireless Power Transfer Systems

“…The general calculation method of mutual inductance between each TX and RX has been presented in the former works of our team [2,8]. The electrical parameters of TX and RX are listed as follows: parasitic resistances including the ESR of external series capacitor, self-inductance, and capacitance of external series capacitor of TX are 5 Ω, Figure 4(a) shows the efficiency in the circular study area under a fixed voltage ratio and load, V 1 V 2 = 1 5 and R L = 10 Ω.…”

“…The research of magnetic-resonance coupling is particularly prized in the areas of wireless power transfer (WPT) since this research was published in the US journal Science in 2007 [1]. Many interesting fields on magnetic-resonance WPT have been studied in just the last 10 years alone [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

“…In [2,3], the circuit model and evaluation method for conventional and multiple-coil WPT systems are presented to discuss the frequency splitting properties. The frequency splitting results in degraded output power at the original frequency when the transfer distance is shortened.…”

Enhanced Power Transmission for on-Road Agv Wireless Charging Systems Using a Current-Optimized Technique

“…The early structure of a magnetic coupling WPT system was composed of four elements: source loop, transmitting coil (TX), receiving coil (RX), and load loop [2][3][4]. In order to heighten transmission distance with power delivered to the load (PDL), multi-repeater WPT systems have been proposed [5][6][7][8]. The practical application of a single charging platform supplying power to multiple devices attracts a great deal of attention [9][10][11], and some approaches using multiple TXs to transfer more power to a single RX have been studied in [12][13][14].…”

Cost-Effectiveness Comparison of Coupler Designs of Wireless Power Transfer for Electric Vehicle Dynamic Charging

“…Wireless power transfer (WPT) has attracted more and more attention for contactless charging and has been developed significantly for various applications in recent years [1][2][3], such as cell phone charging [4], grid fault detection [5], biomedical implants [6], etc. WPT technologies have been demonstrated to be suitable for complex operating situations [7,8].…”