Active Rectification for the Optimal Control of Bidirectional Resonant Wireless Power Transfer

In this paper, a method resorting to an active rectification for the optimal control of a bidirectional resonant wireless power transfer system is proposed. Benefiting from a dual active bridge topology, the real and the imaginary parts of the equivalent load impedance can be modulated simultaneously and independently, without requiring any additional power converter. Hence, the proposed method - based on a first harmonic analysis (FHA) - has shown its capacity to achieve the system maximum efficiency and to furnish the required power on an open-loop test-case despite variations in the windings mutual inductance and mistuned resonant capacitors. By extension, the proposed method is able to counter any change in the circuit parameters to some extent. Finally, a time-domain analysis (TDA) is performed for discussing on controllability restrictions associated with the considered full-bridge converters, whereas demonstrating the quasi-equivalence between TDA and FHA results.