High-reliability inverter

Abstract

The invention provides a high-reliability inverter. In the high-reliability inverter, the source of a first power three-pole switching tube and the drain of a second power three-pole switching tube are connected with the positive electrode of a first power diode and the negative electrode of a fourth power diode, the source of a fourth power three-pole switching tube and the drain of a third power three-pole switching tube are connected with one end of an output filter capacitor and one end of a load, the other ends of the output filter capacitor and the load are connected with one end of an output filter inductor, and the negative electrode of a fifth freewheel diode and the positive electrode of a sixth freewheel diode are connected with the other end of the output filter inductor. By the inverter, the problem of through connection of a bridge arm is solved; compared with the traditional semi-bridge inverter, the high-reliability inverter has the advantages that the voltage stress of a power device is reduced, and the high-reliability inverter is more suitable for high-voltage and high-power occasions; the problem of reverse recovery of a body-free diode is solved, reverse recovery loss is correspondingly reduced, and high conversion efficiency is achieved; and moreover, the inverter has the advantages of simplicity in control scheme, high reliability and the like, and is easy to implement.

Description

technical field [0001] The invention relates to an inverter in an electric energy conversion device, in particular to a high-reliability inverter. Background technique [0002] With the development of power electronics technology, inverters have been widely researched and applied. Traditional bridge inverters have bridge arm shoot-through problems and body diode reverse recovery problems, among which the bridge arm shoot-through problem reduces inverter In order to avoid the straight-through problem of the bridge arm, it is necessary to add a dead time between the driving of the upper and lower bridge arms, and the addition of the dead time will increase the THD of the inverter output, and even cause the output waveform to be distorted. In addition, the reverse recovery problem of the body diode is manifested in that the reverse recovery time of the body diode is long, and the reverse recovery loss is large, which is not conducive to the improvement of the efficiency of the ...

AI Technical Summary

Problems solved by technology

[0002] With the development of power electronics technology, inverters have been widely researched and applied. Traditional bridge inverters have bridge arm shoot-through problems and body diode reverse recovery problems, among which the bridge arm shoot-through problem reduces inverter In order to avoid the bridge arm through problem, it is necessary to add dead time between the drive of the upper and lower bridge arms, and the addition of the dead time will increase the THD of the inverter output, and even cause the distortion of the output waveform

In addition, the reverse recovery problem of the body diode is manifested in the long reverse recovery time of the body diode and the large reverse recovery loss, which is not conducive to the improvement of the efficiency of the inverter

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