| Title |
Design and Parallel Operation of 30 kW SiC MOSFET-Based High Frequency Switching LLC Converter With a Wide Voltage Range for EV Fast Charger |
| Authors |
Gi-Young Lee ; Sung-Soo Min ; Su-Seong Park ; Young-Chan Cho ; Sang-Taek Lee ; Rae-Young Kim |
| DOI |
https://doi.org/10.6113/TKPE.2022.27.2.165 |
| Keywords |
EV fast charger; LLC converter; Snubber capacitor; Parallel operation; Wide output voltage range |
| Abstract |
The electrification trend of mobility increases every year due to the development of power semiconductor and battery technology. Accordingly, the development and distribution of fast chargers for electric vehicles (EVs) are in demand. In this study, we propose a design and implementation method of an LLC converter for fast chargers. Two 15 kW LLC converters are configured in parallel to have 30 kW rated output power, and the control algorithm and driving sequence are designed accordingly and verified. In addition, the improved power conversion efficiency is confirmed through zero-voltage switching (ZVS) of the LLC converter and reduction of turn-off loss through snubber capacitors. The implemented 30 kW LLC converters show a wide output voltage range of 200?950 V. Experiments applying various load conditions verify the converter performance. |