A cascaded multi-bootstrap dc-dc converter for photovoltaic systems

Abstract

The invention discloses a cascaded multi-bootstrap DC-DC converter for a photovoltaic system, which includes an input power supply V in , input supply V in The positive connection of the inductance L 1 at one end, the inductance L 1 The other ends are connected to the freewheeling diode D 1 anode and freewheeling diode D 2 anode of the freewheeling diode D 1 The cathodes of the coupled inductors are respectively connected to the primary winding L of the coupled inductor 2 One end of the capacitor C 1 One end and the clamping capacitor C b One end of the coupled inductor primary winding L 2 The other ends are connected to the freewheeling diode D 4 The anode, capacitor C 3 One end of the freewheeling diode D 2 The cathode and the drain of the switching tube S, the capacitor C b The other ends are respectively connected to the clamping diode D b cathode and freewheeling diode D 3 the anode of the capacitor C 3 The other ends are respectively connected to the clamping diode D b The anode and coupled inductor secondary winding L 3 One end of the coupled inductor secondary winding L 3 The other ends are connected to the freewheeling diode D 4 The cathode and capacitance C 2 one end.

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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