IMeP: Impedance Matching Enhanced Power-Delivered-to-Load Optimization for Magnetic MIMO Wireless Power Transfer System

Recently, multiple-input multiple-output (MIMO) technology has been introduced into magnetic resonant coupling (MRC) enabled wireless power transfer (WPT) systems for concurrent charging of multiple devices. However, impedance mismatching phenomena caused by strong TX-RX, TX-TX, or RX-RX greatly affect the delivered to load (PDL) in practical systems. To solve this issue, we propose an effective scheduling algorithm I mpedance M atching enhanced P DL optimization MIMO MRC-WPT (called IMeP ), which integrates transmitter together with matching techniques, i.e. , adjusting TX coils tuning TX-RX/TX-TX and grouping RXs separate strongly coupled RX pairs. We formulate as a joint problem decouple it three sub-problems, current scheduling, coil adjustment, grouping. then them through alternating direction method multipliers (ADMM) based, randomized beamforming (RB) graph clique cover based algorithms, respectively. Extensive experiments are performed on prototype testbed, results demonstrate effectiveness our solution. Compared state-of-the-art efficiency (PTE) maximization solution, proposed achieves 74.7X performance improvement PDL average.