Modular 11kW bidirectional onboard charger with SiC-MOSFET technology for mobile applications

Greifelt, Andreas; Heiland, Georg; Gerling, Dieter

doi:10.1109/cobep.2017.8257237

Cited by 2 publications

(1 citation statement)

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“…Charging of 48 V EVs is still a major challenge as it would require very high currents that must be managed using heavy and bulky connectors and cabling. 48 V on-board chargers were developed that would suit over-night charging [9]. Fast charging at 200 kW would instead require currents more than 4 kA in the few meters of cable between a charging station and the vehicle.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Battery for Charging 48 V EVs in High-Voltage Infrastructure

2022

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48 V is emerging as a safe-to-touch alternative voltage level for electric vehicles (EVs). Using a low- instead of a high-voltage drive train reduces isolation efforts, eliminates the risk of electric shock, and thus increases the system safety. In contrast, fast charging of a 48 V battery would require very high currents and is incompatible with the widely established high-voltage electric vehicle charging infrastructure. Instead of employing additional on board power converters for fast charging, the concept of a reconfigurable battery is presented. A small-scale prototype system is designed consisting of eight 48 V lithium iron phosphate battery modules. In series configuration, they can be charged at 460 V with up to 25 A. In 48 V parallel configuration, the peak discharge current is up to 800 A. The MOSFET-based reconfiguration system also operates as a module charge balancer during high-voltage charging. The cost overhead for the reconfiguration system is estimated to 3% for a scaled-up full size EV. Due to the additional reconfiguration switch resistances, the simulation of a 48 V 75 kW electric vehicle in the World harmonized Light-duty vehicles Test Procedure showed a performance reduction of 0.24%.

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Section: Introductionmentioning

confidence: 99%