Four-level topological unit and application circuit thereof

Abstract

The invention discloses a four-level topological unit which comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube and diodes reversely connected at both ends of the switching tubes in parallel. Compared with the diode-clamped four-level topological unit in the prior art, the number of the clamped diodes used is reduced by four. Compared with the flying capacitor four-level topological unit in the prior art, the number of the capacitors used is reduced by 3 in the process of applying the four-level topological unit to a four-level inverter. Therefore, the four-level topological unit used to form the four-level inverter can reduce the number of semiconductor apparatuses in the four-level inverter to effectively lower the cost of the inverter and simplify the structure of the inverter so as to reduce the packaging difficulty. The invention further discloses various four-level inverters and a four-level direct current-alternating current converting chip.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a four-level topology unit and a four-level inverter. Background technique [0002] Inverters convert direct current to 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 capacitors C1, C2 and C3, an...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the number of semiconductor devices used in the traditional diode-clamped four-level inverter and the flying-capacitor four-level inverter is relatively large, which increases the cost of the inverter and also increases the size of the inverter. Packaging Difficulty

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