Single-phase three-switch-tube pseudo totem pole type three-level rectifier

Abstract

A single-phase three-switch-tube pseudo totem pole type three-level rectifier comprises a single-phase pseudo totem pole structure, a filter and a single-phase rectifier bridge with a bidirectional switch tubes. According to the single-phase pseudo totem pole structure, two asymmetric bridge arms are formed by two full-control power switch tubes and two common diodes; the single-phase rectification branch with the bidirectional switch tubes is composed of a bridge arm composed of two diodes, a group of bidirectional switch tubes, two identical capacitors and a load; and the bidirectional switch tube structure is composed of four diodes and a full-control switch tube, and bidirectional flow of current is achieved. The single-phase three-switch-tube pseudo totem pole type three-level rectifier integrates a traditional totem pole rectification technology and a three-level topology technology, and compared with a traditional boost power factor correction rectifier, the single-phase three-switch-tube pseudo totem pole type three-level rectifier can effectively reduce stress of the switch tubes, conduction loss of the switch tubes is small, and meanwhile the bridge arm direct connection phenomenon does not exist.

Description

technical field [0001] The invention relates to the technical field of power electronic electric energy conversion, in particular to a single-phase three-switch tube pseudo-totem pole three-level rectifier. Background technique [0002] In order to reduce the harm caused by high-order harmonics to electrical equipment caused by the power grid, a large number of power electronic equipment has been put into use. Due to the existence of the diode rectifier bridge in the traditional boost power factor correction circuit, the efficiency cannot be further improved. In recent years, the bridgeless power factor correction circuit has attracted much attention because it omits the conduction number of diodes in the conduction loop and effectively reduces the conduction loss of power devices. Among them, the traditional totem pole two-level rectifier topology has the advantages of higher efficiency, no bridge arm through-circuit, and fewer components than other topologies. However, th...

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Problems solved by technology

[0003] The present invention provides a single-phase three-switch tube pseudo-totem-pole three-level rectifier, which combines the traditional totem-pole structure with a three-level rectifier bridge, maintains the advantages of the traditional totem-pole two-level rectifier, and utilizes the three-level technology Solve the problem of high voltage stress on power devices of two-level rectifiers

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