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Non-isolated three-phase rectification converter and control method

A three-phase rectification, non-isolated technology, applied in the direction of converting DC power input to DC power output, converting AC power input to DC power output, irreversible AC power input to DC power output, etc., can solve the problem of diversion path Problems such as many devices and high cost requirements in application sites

Pending Publication Date: 2021-09-14
深圳市高益智能电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a non-isolated three-phase rectifier converter and a control method to solve the cost requirements of the application site caused by the large number of diversion path devices in the above-mentioned prior art and the insufficient utilization of the diversion capacity of the step-down switching device relatively high problem

Method used

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  • Non-isolated three-phase rectification converter and control method
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  • Non-isolated three-phase rectification converter and control method

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Embodiment 1

[0039] Such as image 3 As shown, this embodiment proposes a non-isolated three-phase rectifier converter, including an input rectifier bridge group, a step-down switch unit and an energy storage freewheeling unit; the input terminal of the input rectifier bridge group is connected to an external three-phase The output terminal of the three-wire power supply (or three-phase three-wire power supply with a filter) is connected, the output terminal of the input rectifier bridge group is connected to the input terminal of the step-down switch unit, and the output terminal of the step-down switch unit is connected to the input terminal of the step-down switch unit. The energy storage freewheeling unit is connected. The three-phase three-wire power supply is an AC power supply, including phase A, phase B and phase C; the input rectifier bridge group includes a first rectifier bridge FB1 and a second rectifier bridge FB2, and the first rectifier bridge FB1 and the second rectifier br...

Embodiment 2

[0044] The non-isolated three-phase rectifier converter provided in this embodiment uses two image 3 The input and output of the converter unit in the shown embodiment 1 are connected in parallel, but the phase sequence of the input of the two sub-converter units is different from the three-phase three-wire power supply connection. The first input connection adopts the ABC three-phase phase sequence arrangement, and in addition One uses CAB or any other sequence than the first one.

[0045] Such as Figure 4 As shown, in this embodiment, the non-isolated three-phase rectifier converter includes two sub-converter units connected in different phase sequences, denoted as converter a and converter b, and the input connection of converter a adopts ABC phase sequence Arrangement (consistent with the phase sequence of the converter units in Embodiment 1), the input connection of converter b is arranged in CAB phase sequence; the input and output of converter a and converter b are c...

Embodiment 3

[0076] Such as Figure 14 As shown, this embodiment proposes an implementation scheme that is improved and deformed according to the non-isolated three-phase rectifier converter in Embodiment 1. In this embodiment, a non-isolated three-phase rectifier converter is proposed, including at least three three-phase rectifier converters as described in Embodiment 1 connected in parallel, and the switching tubes between each three-phase rectifier converter are driven to Work in the same frequency mode.

[0077] In addition, for Embodiment 2 or Embodiment 3, since multiple converter subunits in Embodiment 1 are included, the switching tube frequency between each converter subunit can also adopt a phase-staggered mode.

[0078] Through the aforementioned "high" and "medium" driving signal control methods, at least two (denoted as N) parallel-connected three-phase rectifier converters can be controlled respectively, and the switching period of N parallel-connected three-phase rectifier...

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Abstract

The invention relates to the field of power electronics, in particular to a non-isolated three-phase rectifier converter and a control method, and the three-phase rectifier converter comprises an input rectifier bridge group, a step-down switch unit and an energy storage follow current unit; and the input end of the input rectifier bridge group is connected with an external three-phase three-wire power supply, the input end of the step-down switch unit is connected with the output end of the rectifier bridge group, and the output end of the step-down switch unit is connected with the energy storage follow current unit. The converter is simple in structure and simple in control method, the rectifier bridge and the step-down switch in the converter can be reused to the maximum extent, and the converter has very obvious advantages in occasions with medium and high power and requiring high efficiency and high power density.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a non-isolated three-phase rectifying converter and a control method. Background technique [0002] As the current power of electrical equipment is increasing, more and more electrical equipment adopts the three-phase power supply mode. If the electrical equipment does not have the power factor correction (PFC) function, it will greatly damage the power quality of the power grid, seriously Sometimes even lead to the paralysis of the grid. In order to meet the quality requirements of the power grid, reduce harmonic pollution to the power grid or cause unnecessary transmission burden on the distribution network, the three-phase electrical equipment must have the PFC function or add a filter device to meet the requirements of relevant regulations. [0003] Generally speaking, for a three-phase AC input rectifier conversion circuit, if the PFC (power factor correction) function is r...

Claims

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Application Information

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IPC IPC(8): H02M7/08H02M7/217H02M3/158
CPCH02M7/08H02M7/2173H02M3/1584
Inventor 李伦全李玲刘斌
Owner 深圳市高益智能电气有限公司
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