A ZVT Bidirectional Converter With Coupled-Filter-Inductor and Elimination of Input Current Notches

This article proposes a ZVT bidirectional buck/boost converter. The proposed converter benefits from the features of the coupled-filter-inductor, while there are no current notches on the current waveform of the input source. As a result, the lifetime of the batteries, which are the primary input source of the bidirectional converters increases, and also, the EMI noises on the equipment which is connected to the batteries would reduce. In the proposed converter, ZVS condition of the main switches and ZCS condition of the auxiliary switches are obtained, regardless of the condition of load, values of the input or output voltages, and the power flow direction. The proposed converter is thoroughly analyzed, and to confirm the theoretical analysis, the experimental results of a 200 W-100 kHz prototype for both the boost and buck modes are presented. Besides, the harmonic content of the input current is analyzed and compared, theoretically and practically.