High-gain boosting type direct-current converter

The invention provides a high-gain boosting type direct-current converter, comprising two inductors, two power switches, two output diodes and a voltage-multiplying unit, wherein input ends of the first inductor and the second inductor are connected with an anode of an input power supply; output ends of the first inductor and the second inductor are connected with drain electrodes of the first power switch and the second power switch; source electrodes of the first power switch and the second power switch are connected with a cathode of the input power supply; grid electrodes of the two power switches are respectively connected with respective controllers; a phase difference between driving phases of the two power switches is 180 degrees, namely an interleaving control policy is adopted; and one time of basic gain is improved on the basis of the gain of the previous circuit by additionally arranging one voltage-multiplying unit in the circuit. Compared with the existing high-gain boosting type direct-current converter, the high-gain boosting type direct-current converter has the advantages that the circuit topology is simple and the coupling inductance does not exist (EMI (Electro-Magnetic Interference) is small); and voltage stress of a switching element can be greatly reduced and the whole working efficiency of the converter is improved.