Dual Side Control of Wireless Power Transfer with Mutual Inductance Estimation

In this paper, with two H-bridge inverters like a dual active bridge, a dual side controlled wireless power transfer (WPT) system is proposed, especially without communication. In conventional dual side-controlled communication-less WPT studies, load condition is unknown at the primary side inverter. So, the primary side inverter usually operates in the full load condition. This paper proposes a way for controlling the primary side inverter according to load conditions with the estimation of secondary side inverter information. For the way, the estimation procedure of mutual inductance considering the change of self-inductance at the primary side is proposed. The proposed method improves efficiency at the overall load condition, which is verified with the experimental results.