Multi-Objective Optimization of On-Board Chargers Based on State-of-the-Art 650V GaN Power Transistors for the Application of Electric Vehicles

High voltage GaN power transistors have the potential to enable high efficiency and power density of power electronic converters like on- board charger (OBC) in electric vehicles. A comprehensive design optimization with state-of- the-art GaN-HEMT devices is essential to achieve a lightweight, compact and efficient OBC. This paper presents a design optimization for achieving multiple objectives (efficiency and volume) at the same time. The optimization searches for optimal switching frequencies and suitable GaN-HEMT transistors for a given power rating. These state- of-the-art GaN-HEMT transistors are collected from different manufacture regarding the smallest values of Rds(on) and different type of packaging. The optimal solutions show that a 3.7 kW OBC based on 650V GaN devices can achieve an efficiency of 96.32%, volume of 1.82 L and power density of 2.03 kW/L.