High-gain direct-current converter topological structure based on active network

Abstract

The invention relates to the field of direct-current converters, in particular to a high-gain direct-current converter topological structure based on an active network. The structure comprises an input source, four inductors, two power switch tubes, two diodes, three capacitor units, an output diode, an output filter capacitor and a load resistor, wherein the front stage of the converter is an active network Boost structure composed of two inductors and a power switch tube, and the rear stage of the converter is a boost unit composed of an inductor, a capacitor and a diode. On the basis that the number of capacitors is not increased, the topological structure of the high-gain converter is deduced by reasonably changing the positions of the capacitors in the boost unit, and the topologicaltypes of the high-gain direct-current converter are enriched; meanwhile, the direct-current converter can complete a high-gain boosting task from a photovoltaic cell to a direct-current bus required by a grid-connected inverter, and has the advantages of small voltage stress of a power device and simplicity in control.

Description

technical field [0001] The invention relates to the field of DC converters, in particular to a topological structure of a high-gain DC converter based on an active network. Background technique [0002] With the energy crisis and environmental pollution, solar energy and fuel cells have become a major part of the world's energy structure. However, the output voltage of new energy power generation units such as photovoltaics and fuel cells is far lower than the DC bus voltage required for grid connection, and a high-gain step-up DC-DC converter is usually required as an interface circuit. [0003] The traditional Boost converter can only be applied to occasions where the voltage gain is less than 8, and the boosting capability is limited. In order to increase the voltage gain, various non-isolated high-gain DC converter topologies have been proposed in the prior art. One is to use multi-stage cascading of converters to achieve high-gain boost, but it requires multiple sets ...

AI Technical Summary

Problems solved by technology

However, the existing high-gain DC converter technology based on inductor-capacitor-diode only proposes a single topology or expands the number of topologies by increasing the number of capacitors, and does not derive high gain based on the position transformation of the capacitor in the capacitor unit. Converter topology

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