Four-level inverter topological unit and four-level inverter

Abstract

The invention provides a four-level inverter topological unit. The four-level inverter topological unit comprises four switching tubes of diodes in reverse parallel connection and two diodes; and relative to the technical problems that a large number of semiconductor devices are arranged in the conventional four-level inverter, the cost for the inverter and reference circuits thereof is increased, and the packaging difficulty of the inverter and application circuits thereof is increased as a large number of semiconductor devices are arranged in the four-level inverter, the four-level inverter topological unit provided by the invention reduces the number of the semiconductor devices in the entire inverter while realizing single-phase and multi-phase applications and ensuring that direct current is inverted into alternating current, the size is small, the cost is low, and the packaging difficulty of the application circuits of the four-level inverter topological unit is reduced at the same time.

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 with 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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