A Dual-Output AC–AC Converter for Double Transmitter Wireless Power Transfer Systems

The double transmitter wireless power transfer (WPT) system has broad application prospects in the fields of public transportation, underwater unmanned equipment, and smart home. However, traditional double transmitter WPT systems use independent power supplies to drive each coil, resulting in high hardware costs and complex control. To simplify the topology of the double transmitter WPT system, this article proposes a high-performance single-input dual-output ac–ac converter, which can achieve dual high-frequency ac outputs under a 50 Hz ac power supply conditions. The proposed ac–ac converter can decrease the count of power converters and improve the transmission efficiency of the double transmitter WPT system. First, the structure and working principle of the ac–ac converter are introduced. An equivalent circuit model of the double transmitter WPT system is established, and the impact of mutual inductance variation on the output current is analyzed. Based on this, a constant current control strategy is also explained. Finally, an experimental platform is built to verify the superiority of the proposed topology. The experimental results verify the effectiveness of the proposed ac–ac converter, the transmission efficiency can reach up to 93.7%. The WPT system can maintain a constant current output under misalignment conditions.