A Multichannel High-Current AGV Wireless Charging System Based on Perpendicular DD Coil Array and Current Multiplier Rectifier

With the rapid development of wireless power transfer (WPT) technology, high-power wireless charging for the automatic guided vehicle (AGV) has become a hot topic in recent years. The charging voltage of the AGV is lower than 60 V, the receiver current can be tens of amperes, forming a low-voltage high-current system. In this article, an <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</i>-channel interleaved current-multiplier WPT system is proposed to promote the current level as well as the system reliability. The perpendicular DD coil array with self-decoupling is adopted to realize independent power transmission of each channel. Finally, a four-channel current-quadruple WPT prototype is built and a series of experiments are conducted. The results show that the system reaches an output power of about 2 kW with the efficiency of 87.81%.