A High Frequency Switched Gallium Nitride Based Bi-directional EV Supply Equipment for Vehicle-to-Home Applications

The rapid growth of global electric vehicle (EV) adoption, fueled by advancements in power electronics and battery technologies, has led to an increasing demand for fast and efficient charging solutions. There is a rising research interest in compact EV supply Equipment(EVSE) with vehicle-to-grid (V2G), vehicle-to-home (V2H), and vehicle-to-load (V2L) capabilities, as these systems play a crucial role in improving grid resilience and energy flexibility.A need of high performance with improved power density has drifted the designs from Silicon (Si) to Gallium Nitride(GaN). This paper presents the design and implementation of a high-frequency bidirectional EV charger utilizing Gallium Nitride (GaN) power devices for improved efficiency and compactness. The system operates at 200 kHz and consists of two power conversion stages: a totem-pole power factor correction (PFC) converter, which rectifies the singlephase 230 V AC input to 400 V DC while achieving high power factor, and a dual active bridge (DAB) converter, which provides galvanic isolation and efficient DC-DC conversion to 48 V DC. A novel control strategy is introduced to address zero-crossing challenges in the totem-pole PFC, ensuring stable operation and minimal harmonic distortion. The use of GaN devices enables high-frequency operation, reducing passive component value, size and enhancing power density. Experimental results validate the effectiveness of the proposed design, demonstrating high efficiency, stable operation, and reliable bidirectional power transfer. This work contributes to the development of compact, high-performance EV interfaced (V2H) systems that support grid stability and energy resilience in residential applications.