AC-AC three level AC-AC converter based on positive converter

Abstract

This invention discloses an AC-AC three-level converter based on normal converter, in which, the circuit of the converter is composed of an input high voltage AC supply, an input filter, a multi-level converter, a HF transformer, a cycle converter, an output filter and output AC load, in which, the multi-level converter is composed of one or many basic units to convert the input voltage to multiple output levels, said basic unit is made up of two four quadrant power switches and one four-quadrant clamp power switch and the circuit topology group based on the AC-AC three-level converter of a normal converter includes normal, push-and-pull, semi-bridge and full bridge topologies, which reduces voltage stress of power switch, series of power conversion and increases power factors of input side, conversion efficiency and power density.

Description

technical field [0001] The invention belongs to power electronic conversion technology, in particular to an AC-AC three-level AC-AC converter based on a forward converter. Background technique [0002] AC-AC conversion technology is a conversion technology that uses power semiconductor devices to convert AC power of a certain frequency and amplitude into AC power of the same or another frequency and amplitude. It is widely used in National defense, industrial and mining enterprises, scientific research institutes, university laboratories and daily life. [0003] So far, research on AC-AC converters by power electronics researchers at home and abroad has mainly focused on two-level AC-AC converters such as non-electrical isolation, low-frequency and high-frequency electrical isolation; for multi-level converters Research mainly focuses on multilevel DC-DC, DC-AC and AC-DC converters, while research on multilevel AC-AC converters is very small, and is limited to non-isolated,...

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