Direct-current to direct-current converter with high boost transformation ratio

The invention, which belongs to the technical field of power electronics, relates to a direct-current to direct-current converter with high boost transformation ratio. The converter comprises a direct current input terminal, a direct current output terminal, two boost inductors (L1 and L2), two intermediate reservoir capacitances (C1 and C2), four unidirectional rectifier diodes (D1, D2, D3, and D4), two switch tubes (T1 and T2), and a output filter capacitor C3. According to the invention, a controlling method that T1 and T2 are complementary and conducted is employed; the self-boost capability of the intermediate reservoir capacitances enables the high boost transformation ratio of the converter to be allowed; besides, the input current ripple and the output current ripple are small.