Conference paper
Highly Efficient EV Battery Charger Using Fractional Charging Concept with SiC Devices
This paper describes the implementation of the fractional power conversion concept for use in an on-board charger for Electric Vehicles (EV). High gain step up topologies are required and an efficiency analysis of the full bridge boost converter is made. A comparison of many power devices including Si, GAN and SiC devices concludes that SiC devices are well suited for this application.
Using loss equations and battery charging characteristics the converter is optimized for low loss in a full battery charge cycle. Switching-average methods model the small signal characteristics and a PI controller is implemented. The fractional charging configuration results in a very high current gain.
A 100 kHz prototype was tested on a 300 V EV battery, achieving a converter efficiency of 97.6%. For a 400 V battery the charger can charge 4 kW at more than 98% efficiency. The power density of the charger is 3.6 kW/L.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2019 |
| Pages: | 1601-1608 |
| Proceedings: | 2019 IEEE Applied Power Electronics Conference and Exposition |
| ISBN: | 1538683296 , 153868330X , 153868330x , 1538683318 , 9781538683293 , 9781538683309 and 9781538683316 |
| ISSN: | 10482334 and 24706647 |
| Types: | Conference paper |
| DOI: | 10.1109/APEC.2019.8722191 |
| ORCIDs: | Zhang, Zhe |
Batteries Battery chargers Control system analysis Control theory DC-DC power converters Design optimization Field effect transistors Gain Inductors PI PI control Si SiC Silicon carbide Switches Switching frequency battery charge cycle battery chargers battery charging characteristics battery powered vehicles converter efficiency efficiency analysis electric vehicles fractional charging concept fractional charging configuration results fractional power conversion concept frequency 100.0 kHz full bridge boost converter high current gain high gain step highly efficient EV battery charger loss equations on-board charger power 3.6 kW power 4.0 kW power convertors power density power devices secondary cells silicon carbide devices silicon compounds switching convertors switching-average methods model voltage 300.0 EV voltage 400.0 V wide band gap semiconductors
