Abstract
A DC-DC converter that can be applied for battery chargers with the power-capacity of over 7-kW for electric vehicles (EVs) is presented in this paper. Due to a new architecture, the proposed converter achieves a reduction of conduction losses at the primary side by as much as 50% and has many benefits such as much smaller circulating current, less duty-cycle loss, and lower secondary-voltage stress. In addition, its power handing capacity can be upsized easily with the use of two full-bridge inverters and two transformers. Besides, all the switches in the converter achieve zero-voltage switching (ZVS) during whole battery charging process, and the size of output filter can be significantly reduced. The circuit configuration, operation, and relevant analysis are presented, followed by the experiment on a prototype realized with a 7-kW charger. The experimental results validate the theoretical analysis and show the effectiveness of the proposed converter as battery charger.
Highlights
Due to global warming and decreasing availability of fossil fuels, electric vehicle (EV) penetration in the vehicle market is growing quickly
EVs need some form of rechargeable energy storage such as batteries
The capacity of the battery in EVs has kept increasing in order to extend the driving range after charging the battery once, and with this battery capacity increase, the power handing capacity of battery chargers is continuously increasing to shorten the charging time [1]
Summary
Due to global warming and decreasing availability of fossil fuels, electric vehicle (EV) penetration in the vehicle market is growing quickly. Increasing the power-capacity with conventional chargers causes serious problems such as poor efficiency, large circulating current, large switching power loss, and very high voltage stress. Because rectifier diodes in the DC-DC converter experience very high large conduction losses are generated, a serious problem the power-capacity of voltage stresses, very large conductionwhich lossesisare generated, whichfor is increasing a serious problem for increasing battery chargers [13]. Its power handing capacity can be less duty-cycle losses, and lower secondary-voltage its power handing capacity upsized with the use of two full-bridge inverters and two transformers. During the whole battery active switches in the proposed converter achieve zero-voltage switching (ZVS) during the whole charging process,process, and the and size the of the canfilter be reduced significantly. Battery charging sizeoutput of thefilter output can be reduced significantly
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