Switching Strategy of DWPT Systems Based on Mutual Inductance Estimation Positioning Scheme for Constant Output Voltage

In this article, we propose a novel switching strategy for maintaining constant output voltage in dynamic wireless power transfer (DWPT) systems, leveraging a positioning scheme based on mutual inductance estimation. First, we enhance the secondary coil positioning method by improving mutual inductance estimation to support various load types. Furthermore, a practical secondary coil positioning scheme is introduced to address real-world challenges in DWPT systems, factoring in parameter fluctuations and time delays. Following this, steady-state and transient models of the primary coil switching process are derived to thoroughly assess the switching dynamics and identify potential safety risks. Based on these insights, we develop a primary coil switching strategy that guarantees both system safety and consistent output voltage while facilitating practical implementation. Simulation and experimental results validate the design objectives of the secondary coil positioning scheme and primary coil switching strategy. Furthermore, we analyze the mutual interactions between the positioning scheme and switching strategy, confirming their compatibility and effectiveness under simultaneous operation.