Abstract

Due to the trend toward high-power on-board charging for Electric Vehicle (EV) powertrains, modular approach has been considered as an evident solution to achieve high power level, high efficiency, and reliability. However, it increases the complexity in both hardware and controller design. This paper proposes a comprehensive control strategy for GaN-modular charging system that can implement a precise constant current and constant voltage (CC/CV) charging profile and an excellent current sharing capability. Moreover, the efficiency of the proposed system is improved at a wide range of charging power by adopting a proper load shedding scheme. The circuit configuration consists of three individual modules of two-stage converter units, in which a totem pole power factor correction (PFC) and an isolated phase shift full bridge (PSFB) are selected as the front-end and back-end converter respectively. The average current mode control employed in PSFB stage not only maintains the constant current charging, but also automatically achieves current balancing among converter modules. The theoretical analysis and simulation results of a 11kW On-Board Charging (OBC) system have been presented to demonstrate the feasibility of proposed control method.

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