Efficiency control for multi-receiver inductive power transfer systems without knowing realtime coupling

This study is centered on maintaining high efficiency within a multi-receiver system in the absence of real coupling information. It explores the derivation of an optimal driving current crucial for efficiency maximization, revealing its reliance on both loading and coupling conditions. Furthermore, an average current is defined based on known coupling ranges, typically accessible during the system's design phase. Employing this derived driving current significantly enhances system scalability with minimal additional requirements in communication, state estimation, and activating circuits. In an experimental setup, a two-receiver system is constructed to contrast the efficiency achieved when possessing real-time coupling knowledge vs solely knowing the coupling range. The observed maximum efficiency difference between these scenarios amounts to 1.7%.