Single-stage isolation type three-phase PFC converter and control method therefor

A converter, isolated technology, applied in the field of single-stage isolated three-phase PFC converter and its control, can solve the problems of complex structure and control method, limited application, etc., to save power devices, drive circuits, and control logic. Streamlined, high working stability

Pending Publication Date: 2018-03-13
SHENZHEN BOYN ELECTRIC
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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 single-stage isolated three-phase PFC converter and its control method to solve the technical problem of limited application caused by the complex structure and control method of the above-mentioned prior art

Method used

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  • Single-stage isolation type three-phase PFC converter and control method therefor
  • Single-stage isolation type three-phase PFC converter and control method therefor
  • Single-stage isolation type three-phase PFC converter and control method therefor

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Embodiment 1

[0041] Such as Figure 4 As shown, this embodiment proposes a single-stage isolated three-phase PFC converter, including a primary input circuit, a transformer, and a secondary output circuit. The primary input circuit includes a first switch unit, a first rectifier unit, The second switch unit and the series resonant unit; the first switch unit includes three switch groups, and the three switch groups are respectively arranged on the three phase lines of the connected three-phase three-wire power supply; the three switch groups are respectively The first rectification unit is connected to the first rectification unit through three phase lines; the first rectification unit is connected to the second switching unit and the series resonant unit connected in series, the primary side of the transformer, and the secondary side of the transformer The side is connected to the output circuit of the secondary side; the first rectifier unit performs AC rectification operation, the trans...

Embodiment 2

[0082] Such as Figure 14 As shown, this embodiment proposes a modified embodiment of the PFC converter according to Embodiment 1. Two isolated three-phase PFC converters are connected in parallel (or interleaved in parallel) to illustrate, and through the control described in Embodiment 1 The method respectively controls at least two three-phase PFC converters connected in parallel. This embodiment can be equivalent to a series resonant half bridge. , it is staggered parallel connection, which can make the input current of the front end continuous and improve EMI.

Embodiment 3

[0084] Such as Figure 15 As shown, this embodiment proposes a modified embodiment of the PFC converter according to Embodiment 1. Two or more isolated three-phase PFC converters are connected in parallel or interleaved in parallel. The control method respectively controls at least two three-phase PFC converters connected in parallel. This embodiment can be equivalent to a series resonant full bridge, and the working phases of converter A and converter B are out of phase by half a high-frequency period. and Q7B each have a 50% duty cycle, so when the first switch unit (Q1AQ2A, Q3AQ4A, Q5AQ6A) of the A circuit is turned on, a loop is formed through Q7B, and the first switch unit of the B circuit (Q1BQ2B, Q3BQ4B, Q5BQ6B) is turned on Time to form a loop through Q7A.

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Abstract

The invention discloses a single-stage isolation type three-phase PFC converter and a control method therefor. The converter comprises a primary side input circuit, a transformer and a secondary sideoutput circuit; the primary side input circuit comprises a first switch unit, a first rectifying unit, a second switch unit and a series resonance unit; the first switch unit comprises three switch groups which are arranged on three phase lines of a connected three-phase three-line power supply respectively; the three switch groups are connected with the first rectifying unit through the three phase lines separately; the first rectifying unit is connected with the second switch unit, the mutually and serially connected series resonance unit and the primary side of the transformer; and the secondary side of the transformer is in circuit connection with the secondary side output circuit. The converter is simple in structure, and realizes the functions of alternating current and direct current conversion, power factor correction, isolation and conversion, soft switching and voltage regulation, so that many power devices are omitted; and therefore, the converter is applicable to a high power density occasion.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a single-stage isolated three-phase PFC converter and a control method thereof. Background technique [0002] In recent years, the power load capacity of single equipment has become larger and larger, and most of them use three-phase power supply, such as electric vehicle charging stations, etc. If there is no PFC correction function, the power quality of the grid will be greatly damaged, and even serious damage will occur. Leading to the paralysis of the power grid, at present, PFC (power factor correction) circuits include two types of boost (Boost) and buck (Buck), but whether it is a boost or buck PFC conversion circuit, if the output needs When the isolation or voltage exceeds a certain range, the subsequent stage needs to add a DC converter. Therefore, for a long time, the AC-DC conversion circuit with three-phase AC input is generally a PFC+DC / DC two-stage circui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M3/335H02M1/42H02M1/32
CPCH02M1/32H02M1/4216H02M3/335H02M7/217Y02B70/10
Inventor 李伦全周涛郑车晓
Owner SHENZHEN BOYN ELECTRIC
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