An unconventional measurement technique to estimate power transfer efficiency in series-series resonant WPT system using S-parameters

Abstract

Power transfer efficiency is a critical performance parameter for the coil design of a wireless power transfer (WPT) system. An accurate and simplistic measurement technique of power transfer efficiency will ensure the system less susceptible to the external environment with high reliability. Broadly, S-parameter-based efficiency is considered a precise measurement technique attained by the network analyzer. However, it lacks consistency in the practical scenario, the input–output ports being calibrated at 50 Ω . Accordingly, most of the power dissipates in the instrument’s internal resistance. Therefore, this article proposes a novel S-parameter efficiency measurement technique aided by user-calibrated source and load factors. This technique’s output ensures the WPT system’s performance assessment even at high frequencies by S-parameters at all conditions. Besides, the proposed technique is experimentally verified and compared with various conventional techniques employed in several literary works.