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Technical Dialogue

Wireless Charging

D24.8 - Wireless Power Transfer System with Automatic Tuning Capability in Metallic Environment

Thursday, March 20, 2025
11:30 AM – 1:30 PM ET
Location: Level One, Hall A3
Wireless power transfer (WPT) systems utilize alternating magnetic fields to transfer energy. However, metal objects within these magnetic fields generate eddy currents, leading to increased system losses, detuning, and reduced power transfer efficiency and capabilities. This paper proposes an automatic tuning assist circuit (ATAC) to mitigate the impact of metal objects on WPT systems. First, an LCC-S compensated WPT system is adopted to theoretically analyze the effects of the metal plate on the receiver side. Moreover, the equivalent model of the metal-affected LCC-S circuit is established, and the ATAC is proposed to eliminate the effects of the coil self-inductance variations caused by the metal plate. Finally, comprehensive experiments are conducted to validate the system performances with and without the ATAC when a metal plate is added to the receiver side of the WPT system. Experimental results indicate that the proposed ATAC can significantly improve the peak power transfer efficiency of the WPT system from 66% to 75%, together with an increment of peak transmitted power of over 210%.