Frequency Sweeping Approach for Achieving Optimal Resonance Frequency in Inductive Wireless Power Transmission (IWPT)

Abstract

Wireless Power Transmission (WPT) technology is widely used but faces significant efficiency limitations due to reliance on manual tuning methods when the load changes. It also requires precise alignment between the transmitter and receiver coils typically confined to distances of less than a few centimeters. Moreover, load variations disrupt the magnetic resonance requiring manual adjustments to restore efficiency. This tuning process is often tedious and inaccurate which leads to suboptimal performance ultimately reducing transmission efficiency. The frequency sweep technique was employed to continuously align the operating frequency with the resonant frequency. This study presents a comprehensive approach for determining the optimal operating frequency in inductive WPT systems enabling the development of an automatic adaptive tuning technique. Experiments were conducted with an Arduino-based model representing the WPT system. Results demonstrated that transmission efficiency increased by at least 10% at a four-centimeter coil separation when the operating frequency was correctly aligned with the resonance frequency. These findings underscore the potential for substantial efficiency improvements in WPT systems through automatic tuning methods offering a more reliable and precise solution compared to manual tuning.