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

A gridded modular bidirectional high voltage gain soft‐switching DC–DC converter and its multiport expansion

“…In addition, it is also worth mentioning that the low efficiency is a common and serious problem of the high VG bidirectional DC-DC converters, which is mainly resulted by large switching losses. Soft-switching techniques of introducing auxiliary cell to the converter are an effective way to achieve zero-voltage switching (ZVS) or zero-current switching (ZCS) of the switches [23][24][25][26][27][28]. The converter proposed in [23], which is based on a cascaded buck-boost structure with active snubber cell, realizes zero-current transition and improves efficiency.…”

“…However, this converter only realizes the soft-switching of the main switches, and the auxiliary switch still works in hard-switching condition, which limits their voltage and power expansion. The converters mentioned in [24][25][26][27] utilizing the coupled-inductor in the auxiliary cell to realize soft commutation of all semiconductor devices. However, the common disadvantage of these converters with the auxiliary coupled-inductor or auxiliary transformer is the inevitable circulating magnetizing energy resulted by the magnetizing inductance, which leads to the saturation and large conduction losses of magnetic elements.…”