Interleaved non-isolated switched capacitor network high-gain soft switching converter and control method thereof

Abstract

The invention discloses an interleaved non-isolated switched capacitor network high-gain soft switching converter and a control method thereof. According to the method, a resonance branch shared by two boost circuits contained in the converter is found through equivalent circuit analysis on the basis of hard switching topology of the high-gain direct-current converter of the interleaved non-isolated diode capacitor network; ZVS switching-on of the two switching tubes and ZCS switching-off of all diodes are achieved by inserting a resonant inductor into the branch and connecting resonant capacitors to the two ends of the switching tubes in parallel. The quasi-resonance soft switching circuit design method has certain universality, is suitable for a high-gain direct-current converter of an interleaved non-isolated switched capacitor network, and has a wide application prospect in a new energy distributed power generation system.

Description

technical field [0001] The invention belongs to the field of distributed power generation such as new energy photovoltaics and fuel cells, and specifically relates to a quasi-resonant circuit design method suitable for a type of non-isolated interleaved boost converter, in particular to a high-gain soft switch for an interleaved non-isolated switched capacitor network Converter and its control method. Background technique [0002] Microgrid technology represents the development trend of distributed energy supply systems in the future and is an important part of the future intelligent power distribution system. It is of great significance to promote energy conservation and emission reduction and achieve sustainable energy development. Photovoltaic and fuel cell technologies in new energy have become ideal ways of future household new energy power generation due to their wide application range, short construction period, and clean and pollution-free features. However, the rem...

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Problems solved by technology

[0006] The purpose of the present invention is to propose a high-gain interleaved non-isolated switched capacitor network for the inherent defects that the interleaved non-isolated diode capacitor network high-gain DC converter cannot further improve the switching frequency and efficiency, and the power density is limited. Soft-switching converter and control method thereof to achieve high efficiency while increasing system power density

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