Single-phase three-level power factor correction circuit with asymmetric novel T-shaped bridges

Abstract

A single-phase three-level power factor correction circuit with asymmetric novel T-shaped bridges comprises an uncontrolled rectifier bridge, two groups of bidirectional power tubes and capacitors C1 and C2. A first rectifier bridge arm of the uncontrolled rectifier bridge and one group of bidirectional power tubes form a first T-shaped bridge, and a second rectifier bridge arm of the uncontrolled rectifier bridge and the other group of bidirectional power tubes form a second T-shaped bridge; the first T-shaped bridge comprises a first group of bridge arms and a group of bidirectional power tubes; the first group of bridge arms comprises diodes D1 and D2, and the group of bidirectional power tubes comprises diodes D5, D6, D7 and D8 and a switch tube S1; the second T-shaped bridge comprises a second group of bridge arms and another group of bidirectional power tubes; and the second group of bridge arms comprises diodes D3 and D4, and the other group of bidirectional power tubes comprises diodes D9 and D10 and switch tubes S2 and S3. According to the circuit, boost output can be achieved, and the requirement for the voltage level of post-stage equipment is met. And meanwhile, the circuit also has the advantages of relatively high DC voltage output, relatively low harmonic content, relatively low switching stress, relatively simple control and the like.

Description

technical field [0001] The invention relates to a single-phase three-level rectifier circuit, in particular to a single-phase three-level power factor correction circuit of an asymmetrical new type T-bridge. Background technique [0002] With the development of economic and industrial control technology, the application fields of high-voltage and high-power converters are becoming more and more extensive, and a large number of rectification and inverter equipment are put into use. In order to meet the requirements of the voltage level of the subsequent equipment and improve the power quality of the grid, we usually introduce a Boost power factor correction circuit between the uncontrolled rectification circuit and the filter capacitor. In this traditional two-level power factor correction circuit, the power device needs to withstand a high turn-off voltage, and the switching loss is also high, and the required passive components are large in size. As the power of the high-v...

AI Technical Summary

Problems solved by technology

In this traditional two-level power factor correction circuit, the power device needs to withstand a high turn-off voltage, and the switching loss is also high, and the required passive components are large in size.

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