Two designs for DC-DC stage of electric vehicle charging stations

摘要

Pulse-voltage and pulse-current methods are widely used in advanced battery charging systems, because they enhance the overall charging process and prolong the battery lifetime. This paper proposes two battery charging systems for an electric vehicle charging station based on these methods. The first design is a developed version of a studied non-dissipative pulse-current DC-DC stage in which the negative pulse current is generated by a current recirculating block. It employs a precisely designed control system to charge and discharge electric vehicles in a wide range of voltage level. The second design is a pulse-voltage DC-DC stage suggested for high-power applications for the first time based on power electronics circuits. It also attenuates the sudden battery power changes caused by pulse-voltage method. The two designs have been accurately formulated. The practical results with the frequency responses confirm that the two designs work well and have less output power changes compared to the recent relevant works.