Hybrid four-level rectifier

Abstract

The invention discloses a hybrid four-level rectifier, which mainly comprises an A-phase circuit, a B-phase circuit, a C-phase circuit, a capacitor C1, a capacitor C2, a capacitor C3 and a resistor R,wherein two ends of the capacitor C1 are recorded as a g end and an h end separately; two ends of the capacitor C2 are recorded as an h end and a j end separately; two ends of the capacitor C3 are recorded as a j end and a k end separately; the A-phase circuit, the B-phase circuit and the C-phase circuit are connected in parallel and then connected to the g end; the capacitor C1 is connected withthe capacitor C2 through the h ends in series; the capacitor C2 is connected with the capacitor C3 through the j ends in series; and the k end of the capacitor C3 is connected with the resistor R inseries and then connected to the g end. According to the hybrid four-level rectifier, the number of output levels is increased, reduction of voltage stress of a switching device is facilitated and theswitching device is applicable to medium-voltage high-power occasions. According to the hybrid four-level rectifier, the harmonic distortion rate of input current is also reduced, the switching lossof a converter is reduced, the switching frequency of the converter is improved, the volume of a passive device is reduced and the power density of the converter can be improved. The hybrid four-levelrectifier is applicable to medium-voltage high-power application occasions and low-voltage high-power density application occasions.

Description

technical field [0001] The invention relates to the electrical field, in particular to a hybrid four-level rectifier. Background technique [0002] Medium and high voltage inverters are widely used in industrial fields such as charging piles, communication power supplies, industrial inverters, and AC / DC transmission systems. The rectifier unit is an important part of the medium and high voltage inverter. [0003] Power semiconductor devices such as insulated gate bipolar transistors are widely used in the field of medium and high voltage inverters. However, at present, the voltage level of high-voltage power semiconductor devices is limited, and the higher the voltage level, the higher the cost, and the poor switching performance. [0004] Although there are two-level and three-level converters with multiple IGBTs connected in series on the market, their design and layout have problems such as poor reliability, large commutation circuits, and high production costs. Theref...

AI Technical Summary

Problems solved by technology

However, at present, the voltage level of high-voltage power semiconductor devices is limited, and the higher the voltage level, the higher the cost, and the poor switching performance

[0004] Although there are two-level and three-level converters with multiple IGBTs in series on the market, their design and layout have problems such as poor reliability, large commutation circuits, and high production costs.

Images