Synchronization Control Method of Dual-Transmitter Wireless Power Transfer System with a Repeater

In order to improve the power transmission capacity of wireless charging system, a dual-transmitter wireless power transfer (DT-WPT) system with a repeater is presented in this paper. On this basis, in order to avoid the cancellation of the power injected by dual transmitters into the repeater, a method to keep the synchronization of the output voltage phases of the dual primary inverters is proposed in this paper. The method is achieved by adding a current-phase detection module in the system and it does not need communication between the two transmitting units.