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Multi-diode series connection type back-to-back bridgeless three-level rectifier

A diode series and three-level rectification technology, which is applied in the direction of electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the problems of increased power loss and economic losses in the power grid, and achieve reduced voltage stress and circuit reduction. The effect of heat generation and small switching loss

Active Publication Date: 2021-05-28
CHINA THREE GORGES UNIV
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  • 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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  • Multi-diode series connection type back-to-back bridgeless three-level rectifier
  • Multi-diode series connection type back-to-back bridgeless three-level rectifier
  • Multi-diode series connection type back-to-back bridgeless three-level rectifier

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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 connection type back-to-back bridgeless three-level rectifier comprises two bridge arms, namely a multi-diode rectifier bridge arm and a traditional rectifier bridge arm. Compared with the traditional rectifier bridge arm, the rectifier reduces the voltage stress borne by the MOS transistor through series connection of the multiple diodes. Meanwhile, an additional power branch is provided to be directly connected to the midpoint of the series capacitor. According to the rectifier, an extra power channel is provided, and meanwhile, a new diode structure is added, so that the stability and the reliability of a circuit are improved. Except the power input end back-to-back MOS transistor group, each MOS transistor is provided with an additional diode to share voltage stress, so that the switching loss is relatively small, the circuit heating is reduced, and the circuit efficiency is 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 circuit size and cost are reduced; output voltage ripples are reduced; and the volume and the cost of the capacitor and the semiconductor device 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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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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