New bidirectional step-up DC-DC converter derived from buckboost DC-DC converter

This paper proposes a new bidirectional step-up DC-DC converter, namely
modified buck-boost DC-DC converter. The proposed DC-DC converter was
derived from the conventional buck-boost DC-DC converter. Output voltage
expression of the proposed converter was derived by considering the voltage
drops across inductors and switching devices. The results have shown that
with the same parameter of input LC filter, proposed DC-DC converter has
lower conduction losses. Moreover, the proposed DC-DC converter has
lower rated voltage of filter capacitor than the conventional boost DC-DC
converter which lead to cost efficiency. Finally, a scaled-down prototype of
laboratory experiment was used to verify its theoretical analysis.