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Bidirectional Wireless Power Transfer using CLLC Resonant Dual Active Bridge using Coupled Inductors

The demand of wireless power transmission is increasing day by day, and resonant dual active bridge (RDAB) has been found to be useful because it helps in achieving high efficiency due to less conduction losses. The main advantage of the RDAB is that it needs less reactive power due to resonance. The resonant dual active bridges give us the advantage of bidirectional power flow, i.e., power can be transferred from source to load side or load to source side. The necessary reactive power needed for converter operation is supplied from the capacitor in primary side of a transformer. To show wireless power transfer instead of using linear transformer, loosely coupled inductors are used in this paper. The RDAB Capacitor-inductor-inductor-capacitor (CLLC) topology helps in achieving zero voltage switching for wide range of loads and it also results in less switching losses and reliable operation. In this paper two different topologies are compared through the MATLAB simulations and then using coupled inductors, bidirectional wireless power flow is shown through CLLC converter.