DUAL ACTIVE BRIDGE - BASED BATTERY CHARGING FOR EV WITH CHARGING CURRENT CANCELING DOUBLE LINE FREQUENCY RIPPLE

Tóm tắt

Two-stage single-phase rectifiers, which comprises a front-end ac-dc converter and a downstream DC-DC stage, are widely used in electric vehicle onboard charger applications. In this context, the implementation of bidirectional power transfer capabilities has gained considerable attention. Then, Totempole power factor correction and Dual Active Bridge converters emerge as commendable choices for enhancing the efficiency of this configuration. The incorporation of wide band gap semiconductor devices serves to elevate the switching frequency, resulting in a notable reduction in the dimensions of passive components. The size of passive components are then reduced significantly. However, the bulk DC-link capacitors of the ACDC stage becomes one of the major barriers to achieve higher power density. The reason is their volume depend on the ripple power at the double line frequency, which generated from the AC-DC stage. Moreover, the charging current containing this low frequency ripple causes negative effect to the batter such as, more heat and reducing the battery life. To solve these problems, software technique to reduce this low frequency current ripple is studied. The analysis, simulations, and experiments are done to verified the effective of method. The results demonstrate that the output current ripple can be reduced by about 9 times when the control technique is applied