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A back-to-back bridgeless three-level rectifier with multiple diodes in series

A three-level rectification and diode series connection technology, applied in electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve problems such as economic losses and increase in power loss of power grids, reduce circuit heating, and reduce voltage. stress, the effect of improving circuit efficiency

Active Publication Date: 2022-05-03
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When the power factor in the grid is poor, the power loss of the grid will increase when transmitting power, resulting in economic losses

Method used

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  • A back-to-back bridgeless three-level rectifier with multiple diodes in series
  • A back-to-back bridgeless three-level rectifier with multiple diodes in series
  • A back-to-back bridgeless three-level rectifier with multiple diodes in series

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Embodiment Construction

[0059] A multi-diode series back-to-back bridgeless three-level rectifier, the effective value of the grid voltage on the input side is 220V, the frequency is 50Hz, the output voltage on the DC side is 400V, the switching frequency is 20kHz, the filter inductance L=3mH, and the resistance value of the load RL 80, the output capacitor C1 = C2 = 4700μF.

[0060]A multi-diode series back-to-back bridgeless three-level rectifier comprises a novel single-phase three-level PWM rectifier circuit, a rectifier bridge circuit, a multi-diode series branch, and two series-connected stabilizing capacitor buffer circuits.

[0061] The rectifier bridge of the rectifier adopts a three-level rectifier connected in series with multiple diodes as a single-phase three-level PWM rectification circuit, which includes 4 fully-controlled power switch MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistor): S 1 , S 2 , S 3 , S 4 , 6 ordinary diodes: D 1 、D 2 、D 3 、D 4 、D 5 、D 6 , an embed...

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Abstract

A multi-diode series back-to-back bridgeless three-level rectifier includes two bridge arms: a multi-diode rectification bridge arm and a traditional rectification bridge arm. Compared with the traditional rectification bridge arm, the rectifier of the present invention reduces the voltage stress borne by the MOS transistor through the series connection of multiple diodes. Also, provide an additional power branch connected directly to the midpoint of the series capacitor. While the rectifier of the present invention provides an extra power channel, since it adds a new diode structure, the stability and reliability of the circuit are improved. In addition to the back-to-back MOS tube group at the power input end, each MOS tube has an additional diode to share the voltage stress, the switching loss is relatively small, the circuit heat is reduced, and the circuit efficiency is improved. Compared with the traditional two-level rectifier, the rectifier can achieve three levels of phase voltage on the AC side, which can significantly reduce the capacitance value; reduce the voltage stress of the device; reduce the circuit volume and cost; reduce The output voltage ripple is reduced; the volume and cost of capacitors and semiconductor devices are reduced.

Description

technical field [0001] The invention relates to the technical field of single-phase three-level active rectifiers, in particular to a multi-diode series back-to-back bridgeless three-level rectifier. Background technique [0002] When the power factor in the grid is poor, the power loss of the grid when transmitting power will increase, resulting in economic losses. In order to reduce the impact of low power factor on the power consumption side on the power grid and improve the overall power factor of the power grid, a large number of power consumption equipment is added with power electronic devices to manage the reactive power at the power consumption end. Therefore, the optimization research of power factor correction circuit has attracted much attention. The multi-diode series back-to-back bridgeless three-level rectifier can maintain a stable voltage output to the load while maintaining a high power factor, and is suitable for many occasions. Compared with traditional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M7/797H02M1/42
CPCH02M7/217H02M7/797H02M1/4225Y02B70/10
Inventor 马辉曾雨涵周沫函邹旭
Owner CHINA THREE GORGES UNIV
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