Four-level topology unit and application circuit thereof

Abstract

The invention discloses a four-level topology unit comprising a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a first clamping diode, a second clamping diode and six diodes. Compared with the diode clamping type four-level topology unit in the prior art, the four-level topology unit disclosed by the invention has the advantages that two clamping diodes are reduced, so that the cost of an inverter is effectively reduced, the structure of the inverter is simplified and the encapsulation difficulty is lowered. Compared with the flying capacitor type four-level topology unit in the prior art, the four-level topology unit disclosed by the invention has the advantages that three capacitors can be reduced when the four-level topology unit is applied to a four-level inverter; and as the cost of the capacitor is far higher than that of the diode, the cost of the inverter is effectively reduced. The invention also discloses a variety of 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 topological unit and an application circuit thereof. Background technique [0002] An inverter 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 capacitors C...

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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