Four-level inversion topological unit and four-level inverter

Abstract

The invention provides a four-level inversion topological unit. The four-level inversion topological unit comprises four switching tubes which are connected in parallel with diodes in reverse direction and two diodes. According to the conventional four-level inverter, due to a large number of semiconductor devices, the cost of the inverter and the cost of an application circuit of the inverter are improved, and the packaging difficulty of the inverter and the packaging difficulty of the application circuit of the inverter are improved. The four-level inversion topological unit provided by the invention has the advantages that when single-phase application and multi-phase application are realized, direct current is inverted into alternating current, the quantity of the semiconductor devices of the whole inverter is decreased, the four-level inversion topological unit is small in size and low in cost, and the packaging difficulty of the application circuit of the inverter is reduced.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a four-level inverter topology unit and a four-level inverter. Background technique [0002] An inverter is a device that converts direct current into alternating current. With the continuous development and progress of technology and the continuous improvement of people's living standards, inverters have also become an important equipment for people to go out and emergency. Most of the current inverters are diode-clamped inverters or flying capacitor inverters. [0003] figure 1 and figure 2 Partial structures of conventional four-level inverters are shown respectively. in, figure 1 It is a partial structure of a diode-clamped four-level inverter, figure 2 It is a partial structure of the flying capacitor type four-level inverter. exist figure 1 In the inverter structure shown, four electrical signals with different potentials are generated through ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in this application is to provide a four-level inverter topology unit and a four-level inverter to solve the problem that the number of semiconductor devices in the existing four-level inverter is large, thereby increasing the The technical problem of the cost of the inverter and its reference circuit, while avoiding the technical problem of increasing the packaging difficulty of the inverter and its application circuit due to the large number of semiconductor devices in the four-level inverter

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