Analysis of Non-Ideal Series-Series Compensated Inductive Wireless Power Transfer Link Under Sub-Resonant Frequency Control

Following the rise in wireless power transfer (WPT) applications, sub-resonant frequency control (SFC) has proven to be an effective solution in cases where constant output current mode (COCM) operation of inductive WPT link (IWPTL) is required. This paper outlines analysis of a non-ideal series-series (SS) compensated IWPTL under SFC, considering the voltage drops across and equivalent series resistance (ESR) of practical components. The resulting equations are then compared with those of an ideal system which have been revealed in previous works, demonstrating an error reduction of up to 83.3% for an example system simulated in PSIM software. The results showcase improved precision of the newly presented approach by demonstrating higher correlation with practical values than previously achieved which may be of great importance in high precision applications.