Advanced Primary-side Load Monitoring Schemes for Inductive Power Transfer Systems with Enhanced Nonlinear Rectifier Load Models

This paper is related to a general method to monitor the load conditions of direct inductive power transfer (IPT) systems at transmitter sides without any communications between the transmitters and receivers. The proposed method is established based on the analysis of IPT systems with full consideration of odd-order harmonics. Based on the derived enhanced nonlinear rectifier load model, the proposed load monitoring method performs superior accuracy than conventional load monitoring methods for IPT systems with light load conditions. Both simulations and experiments have been conducted to verify the effectiveness of the proposed primary-side load monitoring scheme. The results demonstrate that the proposed scheme significantly improves the estimation accuracy across a wide range of load resistances, from 10 Ω to 70 Ω.