Topic: New Challenges, Opportunities and Solutions for EV Charging Facilities
Speaker: Pan Qishan
Date and time: August 23, 14:00–15:00
Venue: Room A200, #1 Building of SIST
Host: Li Zehui
Abstract:
Over the past decade, the electric vehicle (EV) industry has experienced rapid development, drawing significant attention from both industry and academia to the power electronics systems associated with EVs. This rapid expansion suggests that traditional technologies are nearing maturity. However, as new demands for EVs continue to emerge, fresh opportunities for technological advancement arise. To enhance the charging speed of EVs and alleviate range anxiety, there is a general trend towards shifting high-voltage battery systems from 400V to 800V. Additionally, emerging application scenarios such as Vehicle-to-Load (V2L), Vehicle-to-Home (V2H) and Vehicle-to-Grid (V2G) are gaining popularity. Consequently, the corresponding charging facilities, including DC fast chargers and on-board chargers (OBC), require technological innovation. For DC fast chargers, it is essential to accommodate the charging requirements of both 400V and 800V battery platforms. Therefore, the output voltage range of chargers should span from 200V to 1000V. Compared to traditional DC fast charging stations, the new generation features ultra-wide gain range, ultra-high power, and bidirectional power conversion. For OBCs, new bidirectional models compatible with 800V battery platforms are necessary. Unlike traditional 400V OBCs, the increase in output voltage not only raises device voltage stress but also enhances the power of OBC. This shift introduces a demand for single-phase/three-phase grid compatibility. Furthermore, the increased voltage stress enables the replacement of silicon (Si) devices with silicon carbide (SiC) devices and the substitution of electrolytic capacitors (E-caps) with film capacitors. This talk will introduce the new challenges and opportunities facing EV charging facilities and propose feasible solutions, focusing on innovative approaches for ultra-wide gain DC fast charging modules and 800V on-board chargers without E-caps.
Biography:
Pan Qishan received the B.S. degree in Automation from Zhejiang University in 2022. He is currently working toward the Ph.D. degree in Electrical Engineering in the School of Information Science and Technology, ShanghaiTech University. His research interests include ultra-wide gain range resonant converters, universal fast chargers and E-capless on-board chargers for EVs.