A Dynamic Wireless Power Transfer Transmitter Power Distribution Network and Its Switch Method Based on Impedance Switch and Detuning Parameters

In the dynamic wireless power transfer (DWPT) system, cases involving high-speed vehicle operation and simultaneous charging of multiple vehicles will occur. In these cases, the transmitter (Tx) offline switch (the inverter is turned on and off frequently) will result in a significant average power reduction. The Tx online switch (the inverter is always on) is the better choice. However, the Tx online switch will generate switch spikes. To address this problem, considering power stability, economy, efficiency and switch spikes, this article first establishes the basic configuration of the transmitter power distribution network (TPDN) as a parallel LCC compensation topology. However, this topology has an induced current problem caused by the inter-Tx coupling. The induced current and switch spikes will result in low efficiency and high stress. Next, in order to address these problems, the mechanisms of the induced current and switch spikes are analyzed, and a TPDN and its switch control method based on impedance switch and detuning parameters is proposed, which can suppress the induced current and switch spikes without control complex power electronic switches. Finally, an 18-kW experimental platform with two Txs is constructed, which verifies the above methods.