Frequency Division Decoupling of Triple Active Bridge Converters with Asymmetric Duty Modulation

The introduction of Asymmetric Duty Modulation (ADM) not only stands as a recent modulation scheme presenting fresh opportunities to enhance the performance of the Dual Active Bridge (DAB) converter. But it also introduces a novel approach to decouple power in the Triple Active Bridge (TAB) converter. On this basis, this article proposes a frequency division decoupling ADM (FDDADM) scheme specifically designed to untangle power coupling in TAB converter. The TAB converter using the FDD-ADM scheme is firstly analyzed through a high frequency link model. Then, transmission power for each port is determined. The FDD-ADM scheme stands out for its independence from specific phase shift requirements, enabling integration with other efficiency-optimized schemes. The FDD-ADM scheme is compared with Phase Shift Modulation (PSM) scheme in simulation and experiment. The effectiveness of decoupling is validated by simulation and experiment results.