ZVS/ZCS Three-Winding Coupled Inductor Based Non-isolated Bidirectional DC-DC Converter with Ripples Elimination at High Current Port and MPPT of Photovoltaic Systems

In this paper, a new non-isolated bidirectional dc-dc converter with zero voltage switching (ZVS) and zero current switching (ZCS) capability is proposed. The proposed converter not only increases the voltage gain, but also eliminates current ripples at the high current port by using a three-winding coupled inductor. Therefore, the proposed topology is suitable for transferring the photovoltaic (PV) generated power to the load, where the maximum power from PV can be extracted. In the proposed converter, the ZVS operation of two main switches is obtained by using auxiliary switches, while the auxiliary switch is tuned OFF under the ZCS state. The ZVS/ZCS operation of switches can be achieved by tuning parameters of the coupled inductor and the required overlapping time for the trigger pulses of main and auxiliary switches at the whole range of duty cycle (0