Single-stage Differential Current-fed Isolated AC-DC Converter for Electrolytic Capacitor-less OBC with DC Charging

Single-Stage Isolated Electrolytic Capacitor-Less EV Onboard Charger With Power Decoupling

“…The slope of i Lk2 is given as: (28) As shown in Fig. 7 However, during this mode, v ab = V Cc , therefore power is being transferred to the load only through the transformer T 1 and its current increases with the slope given as: (29) Similarly, during Mode 5, S 5 is turned ON, and S 6 is turned OFF. During this mode, L c begins to discharge as a negative voltage equal to -v c2 is applied across it.…”

“…In order to have high frequency isolation, the proposed converter, as shown in Fig. 2, is derived by interleaving each leg of the differential converter [26] and connecting each interleaved leg to the transformer windings of two isolated AC-DC converters [29]. Therefore, the two phase interleaved legs have a 180° phase shift in switching frequency.…”