Voltage-multiplying unit-containing passive lossless clamping high-gain converter

A voltage-multiplying unit-containing passive lossless clamping high-gain converter comprises a power switch tube, two freewheel diodes, an output diode, a clamping capacitor, a voltage-multiplying capacitor, an output capacitor and a coupling inductance with two windings. The coupling inductance is utilized to expand the voltage gain of the converter and reduce the voltage stresses of the power switch tube and the diodes, the leakage inductance of the coupling inductance is used to realize the zero current turning-on of the power switch tube and restrain the reverse recovery currents of the diodes, a clamping circuit which is formed by the output diode and the clamping capacitor effectively absorbs voltage spikes when the power switch tube is turned off and realizes energy lossless transfer, and the voltage-multiplying capacitor is used to further improve the converter gain and further reduce the voltage stresses of the power switch tube and the diodes. The converter is simple in circuit structure, convenient to control and suitable for small power high-gain efficient grid-connected photovoltaic power generation occasions.