Three-port clamping type back-to-back bridgeless three-level rectifier

Abstract

The invention discloses a three-port clamping type back-to-back bridgeless three-level rectifier, and belongs to the technical field of power electronic converters. The three-port clamping type back-to-back bridgeless three-level rectifier comprises a three-port clamping structure and a traditional rectifier bridge arm structure. Compared with a traditional rectifier bridge arm, the three-level rectifier has the advantages that the three-port structure is used for clamping the capacitor voltage so that the voltage stress borne by each semiconductor device in the three-port structure is reduced. Meanwhile, an additional power branch is provided to be directly connected to the midpoint of the series capacitor. According to the three-level rectifier, an extra power channel is provided, and meanwhile, due to the fact that a new diode structure is added, the stability and reliability of a circuit are improved. Compared with a traditional two-level rectifier, the rectifier has the advantages that the number of levels of phase voltage on the alternating current side can be three, and the capacitance value can be remarkably reduced; the voltage stress of the device is reduced; the cost of capacitors and semiconductor devices is reduced; and the size of the circuit is correspondingly increased due to the complexity of the three-port structure.

Description

technical field [0001] The invention relates to the technical field of single-phase three-level active rectifiers, in particular to a three-port clamp type back-to-back bridgeless three-level rectifier. Background technique [0002] For conventional power factor correction (PFC) rectifiers, high efficiency cannot be achieved in a wide input voltage range, such as when the public grid is used as a power source, and the efficiency will be greatly reduced when the AC voltage level is low. The back-to-back bridgeless three-level rectifier of the three-port clamping type can be flexibly adapted to the appropriate working mode to obtain the maximum efficiency due to the three-level structure. At the same time, the three-port clamp-type back-to-back bridgeless three-level rectifier can maintain a stable voltage output to the load while maintaining a high power factor. Compared with the traditional two-level rectifier, the proposed three-port clamped back-to-back bridgeless three-l...

AI Technical Summary

Problems solved by technology

However, due to the large volume of the main circuit of the circuit, the use of the three-port clamp type back-to-back bridgeless three-level rectifier in some occasions is limited.

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