Fig. 4
From: A new coupled-inductor-free bidirectional DC-DC converter with low current ripple in both sides

Equivalent circuit of the converter in step-down mode: (a) first state; (b) second state.
From: A new coupled-inductor-free bidirectional DC-DC converter with low current ripple in both sides

Equivalent circuit of the converter in step-down mode: (a) first state; (b) second state.