GaN-Based DC-DC converters for EV fast charging: A review of wide bandgap devices technology
Rajkumar Ponnambalam, V. Indragandhi
Abstract
The fast-expanding electric vehicles (EVs) market has created demand for high power, efficient fast charging solutions, which are essential to enhance the user experience and enable the higher acceptance of EVs. Still, the inherent limits of conventional silicon (Si)based converters in terms of power density, efficiency and thermal performance limit the development of smaller sized and higher power solutions. Wide bandgap (WBG) semiconductors with Gallium Nitride (GaN) leading the front show remarkable material properties that enable major progress in power electronics. Here, the current situation, technical advancements, continuous challenges and future direction of GaN-based EV chargers are reviewed. The main topics covered are the development of appropriate power converter topologies, advanced GaN High Electron Mobility Transistor (HEMT) gate driving techniques, innovations in high-frequency magnetic component design, effective thermal management for high power density, strategies for electromagnetic interference (EMI) mitigation, device reliability and system-level cost implications. This review paper presents the transforming power of GaN technology to revolutionize the design of EV rapid chargers, enabling the development of more efficient, lightweight and ultimately ubiquitous next generation charging solutions.