| Title |
Comparing and Selecting the Optimal Topology of 50kW Fast Charging DC-DC Converter with a Wide Output Voltage Range |
| DOI |
https://doi.org/10.5370/KIEE.2024.73.5.793 |
| Keywords |
Fast charger; DC-DC converter; Wide output range; High output current; Output reconfigurable structure; LLC resonant converter; Buck converter |
| Abstract |
The introduction of high-voltage battery vehicles and the necessity of 400 kW-capacity EV ultra-fast-charging systems emphasize the requirement for DC-DC converters with wide output voltage ranges and high output capabilities Previously, 10 kW DC-DC converters were parallelly expanded to meet fast charging demands, but for 400 kW chargers, this approach necessitates excessive modules, increasing maintenance and complexity in system configuration and control. This paper analyzed DC-DC converter topologies, to establish an optimized design for DC-connected fast charging specifications. It proposes a topology that addresses the shortcomings of existing ones, designed to operate differently secondary side configuration of the converter for varying battery charging voltages. The proposed 50 kW DC-DC converter, when expanded for fast charging, is expected to offer substantial advantages in maintenance and system configuration |