This paper discusses the bidirectional Wireless Power Transfer (WPT) device for vehicle-to-house (V2H). It makes use of a simple, compact single-ended converter and a phase-difference control mechanism that is self-synchronized. This paper proposes a way whereby phase difference control could well be self-contained just on the slave side without mutual communication. This method allows for high-power wireless transmission despite the low coupling coefficient between the transfer coils. The phase difference and transmission power can be altered by changing the MOSFET conduction time on one side without synchronizing the phases on both sides.