Multi-input converter with power factor correction and maximum power point tracking features

A multi-input converter for photovoltaic (PV) power system applications with power factor correction (PFC) and maximum power point tracking (MPPT) features is proposed in this paper. With the proposed phase-shifted pulse-width-modulation (PWM) control, the multi-input converter can draw power from the utility line and PV arrays individually or simultaneously and deliver it to the load. In addition, an almost unity power factor for the utility line and an MPPT for PV arrays can also be achieved. Moreover, all the power switches in the proposed converter can be operated with either zero-voltage-switching (ZVS) at turn-on transition or zero-current-switching (ZCS) at turn-off transition. Hence, the switching losses of the power switches can be reduced. Experimental measurements are demonstrated to verify the performance of the proposed multi-input converter.