High gain voltage-multiplying structure active lossless clamping converter

The utility model provides a high gain voltage-multiplying structure active lossless clamp converter which comprises a main switch tube, a clamp switch tube, a freewheeling diode, an output diode, a clamp capacitor, a voltage-multiplying capacitor, an output capacitor and a coupling inductor with two windings. According to the utility model, the coupling inductor is used to expand the voltage gain of the converter and reduce the voltage stress of a power switch tube and the diodes; the leakage inductance of the coupling inductor is used to realize zero voltage switching of the switch tubes and suppress reverse recovery current of the diodes; a clamp circuit which is composed of the clamp switch tube and the clamp capacitor effectively absorbs voltage spikes when the main switch tube is switched off and realizes lossless energy transfer; a voltage-multiplying circuit is used to further improve the gain of the converter and further reduce the voltage stress of the power switch tube and the output diode; and the high gain voltage-multiplying structure active lossless clamp converter has the advantages of simple circuit structure and convenient control, and is suitable for a grid-connected photovoltaic power generation occasion with small power, high gain and high efficiency.