The invention discloses a
high voltage gain bidirectional DC-DC (
direct current-
direct current) converter based on switching capacitors and
coupling inductors. The
high voltage gain bidirectional DC-
DC converter based on the switching capacitors and the
coupling inductors is formed by combining Boost convertors, the
coupling inductors and the switching capacitors in interleaved mode. An electric circuit of the
high voltage gain bidirectional DC-
DC converter based on the switching capacitors and the coupling inductors comprises n / 2 coupling inductors T1[L1, L2], T2[L3, L4]... T(n / 2)[L(n-1), Ln], 2n
high frequency power switches S1, S2... Sn and Q1, Q2... Qn, N-1
high frequency switching capacitors C1, C2... C(n-1) and two input and output filter capacitors CL and CH. The high
voltage gain bidirectional DC-
DC converter based on the switching capacitors and the coupling inductors can effectively reduce current stress of a
low voltage side power device and
voltage stress of a high
voltage side power device, further reduces the
ripple of an input current and decrease the
inductor size by using the coupling inductors, improves efficiency of an exchanger, and achieves bidirectional DC-DC conversion high in efficiency and high in voltage gain. According to high voltage gain bidirectional DC-DC converter based on the switching capacitors and the coupling inductors, an interleaved technology, a
magnetic integration technology and a switching
capacitor technology are combined, and therefore novel topology of the high voltage gain bidirectional DC-DC converter based on the switching capacitors and the coupling inductors not only has characteristics of being low in
ripple of the input current and easy to design in EMT mode of an interleaved converter, but also achieves the purposes that a
transformation ratio of input voltage and output voltage is large and switch voltage stress is low.