Three-phase buck-boost rectification converter and control method thereof

A converter, buck-boost technology, applied in the direction of converting DC power input to DC power output, converting AC power input to DC power output, and converting irreversible AC power input to DC power output, etc. Many, large loss and other issues

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

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Problems solved by technology

[0004] The object of the present invention is to propose a three-phase buck-boost rectifier converter and its control method, which solves the problem that the existing two-stage converter needs multiple conversions, there are too man...

Method used

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  • Three-phase buck-boost rectification converter and control method thereof
  • Three-phase buck-boost rectification converter and control method thereof
  • Three-phase buck-boost rectification converter and control method thereof

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Embodiment 1

[0052] Such as Figure 4 As shown, a non-isolated three-phase buck-boost rectifier converter includes an input rectifier bridge group, a step-down switch unit and an energy storage freewheeling unit; the input rectifier bridge group includes first to third rectifier bridges FB1~ FB3, the first to third rectifier bridges FB1 to FB3 all include four diodes, and the four diodes are respectively connected in series in pairs in the same direction to form two bridge arm groups with the same function, and the two bridge arm groups are connected in parallel to form Two AC input ports, that is, the midpoint of two diodes connected in series in the bridge arm group, a rectified output positive terminal, that is, the cathode of the bridge arm group, and a rectified output negative terminal, that is, the anode of the bridge arm group; the step-down switch The unit includes first to sixth switching tubes Q1~Q6, and the energy storage freewheeling unit includes first to second freewheeling ...

Embodiment 2

[0093] Such as Figure 16 As shown, Embodiment 2 proposes a modified embodiment based on Embodiment 1, including at least two non-isolated three-phase buck-boost rectifier converters as described in Embodiment 1, each non-isolated The three-phase buck-boost rectifier converters are connected in parallel, and the working phases of the first to sixth switch tubes Q1 to Q6 of each non-isolated three-phase buck-boost rectifier converter are interleaved according to 1 / N high-frequency switching cycles , where N is the total number of parallel non-isolated three-phase buck-boost rectifier converters.

[0094] The control method of embodiment 2 is the same as that of embodiment 1. Through the "high" and "middle" mode PWM drive signal control methods described in embodiment 1, N non-isolated three-phase buck-boost rectifiers connected in parallel can be respectively The converter is controlled, and the working phases of the first to sixth switching tubes Q1 to Q6 of N three-phase rec...

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Abstract

The invention discloses a three-phase buck-boost rectification converter and a control method thereof. The three-phase rectification converter comprises an input rectifier bridge group, a buck switch unit and an energy storage follow current unit. The input rectifier bridge group comprises first to third rectifier bridges, the step-down switch unit comprises first to sixth switch tubes, and the energy storage follow current unit comprises thirteenth to fourteenth diodes, a seventh switch tube, first to second follow current inductors and a filter capacitor. According to the invention, by applying the middle-mode PWM driving signal and the high-mode PWM driving signal to the switch tube, the input rectifier bridge group and the step-down switch unit in the three-phase rectifier converter can be multiplexed to the maximum extent, and the three-phase rectifier converter is suitable for a wide range of medium and small power output voltage, or the output voltage is in a range from multiple to multiple input phase voltage, and high efficiency and high power density are needed.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a three-phase buck-boost rectifier converter and a control method thereof. Background technique [0002] At present, the power of electrical equipment is getting bigger and bigger, and more and more electrical equipment adopts three-phase power supply mode. If the electrical equipment does not have power factor correction (PFC) function, it will greatly damage the power quality of the grid. In severe cases It may even lead to the breakdown of the power grid. In order to meet the quality requirements of the grid, reduce harmonic pollution to the 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 rectification conversion circuit, if the PFC functio...

Claims

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Application Information

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