Photovoltaic system-used cascaded multi-bootstrap DC-DC converter

Abstract

The invention discloses a photovoltaic system-used cascaded multi-bootstrap DC-DC converter. The photovoltaic system-used cascaded multi-bootstrap DC-DC converter comprises an input power supply Vin;the positive electrode of the input power supply Vin is connected with one end of an inductor L1; the other end of the inductor L1 is respectively connected with the anode of a fly-wheel diode D1 andthe anode of a fly-wheel diode D2; the cathode of the fly-wheel diode D1 is respectively connected with one end of a primary winding L2 of a coupling inductor, one end of a capacitor C1 and one end ofa clamping capacitor Cb; the other end of the primary winding L2 of the coupling inductor is respectively connected with the anode of a fly-wheel diode D4, one end of a capacitor C3, the cathode of the fly-wheel diode D2 and the drain of a switch transistor S; the other end of the capacitor Cb is respectively connected with the cathode of a clamping diode Db and the anode of a fly-wheel diode D3;the other end of the capacitor C3 is respectively connected with the anode of the clamping diode Db and one end of a secondary winding L3 of the coupling inductor; and the other end of the secondarywinding L3 of the coupling inductor is respectively connected with the cathode of the fly-wheel diode D4 and one end of a capacitor C2.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a cascaded multi-bootstrap DC-DC converter for a photovoltaic system. Background technique [0002] With the depletion of traditional fossil energy and the deteriorating environment of human beings, the development of clean renewable energy is imminent. All countries in the world are committed to the research and development of new energy applications, of which solar energy and wind energy have been obtained a wider range of applications. However, for these systems, how to operate grid-connected and meet the high voltage requirements in the grid is still the most important issue. At present, a large number of boost converters have been developed to meet these applications. Among different converters, the traditional BOOST converter can theoretically increase the voltage gain by increasing the duty cycle. However, in practical applications, due to the limitation of parasitic parameters, very...

AI Technical Summary

Problems solved by technology

However, in practical applications, due to the limitation of parasitic parameters, very high voltage gain cannot be achieved

If a cascaded topology is used, the problem of low efficiency caused by the increase in the number of devices will be highlighted again.

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