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A three-phase alternating-current step-up and step-down converter circuit and a control method thereof

A technology of buck-boost conversion and control method, applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, control/regulation system, etc., can solve the problems of efficiency and limited volume and cost requirements, etc. Achieve the effect of reducing the switch drive potential, high efficiency, and simplifying the control method

Pending Publication Date: 2019-01-08
NANJING PANDA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a new three-phase AC-DC buck-boost conversion circuit and its control method to solve the technical problems of the above-mentioned prior art in places with limited efficiency and volume or relatively high cost requirements.

Method used

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  • A three-phase alternating-current step-up and step-down converter circuit and a control method thereof
  • A three-phase alternating-current step-up and step-down converter circuit and a control method thereof
  • A three-phase alternating-current step-up and step-down converter circuit and a control method thereof

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Embodiment 1

[0053] Such as Figure 4 Shown is a three-phase AC-DC buck-boost conversion circuit proposed by the present invention, which includes an input switch tube group, a rectifier switch unit and an energy storage freewheeling unit. The input switch tube group includes three switch tubes Q1~Q3, three switches The tubes Q1~Q3 are respectively set on the three phase lines of the connected three-phase three-wire power supply (or connected through the input filter); the three switching tubes Q1~Q3 are respectively connected to the rectifier switch unit; the sources of the switching tubes Q1~Q3 The three-phase AC input terminals (or input filter terminals) are respectively connected, and the drains of the switching tubes Q1-Q3 are respectively connected to the three input terminals of the rectifying switch unit. The rectifier switch unit is a unit that adds a switch tube at the lower end of the three-phase uncontrolled diode rectifier bridge. The specific connection is that the cathode o...

Embodiment 2

[0060] Such as Figure 4 As shown, a load (or a circuit that can be equivalent to a load) can be connected between the positive output terminal and the negative output terminal. According to the basic principle of circuit step-down, the output voltage should be lower than the input voltage to form a step-down. Therefore, in this circuit, when any two phases of the three phases are turned on, the instantaneous minimum point of a certain interval class should be the 30°, 90°, 150°, 210°, 270°, 330° point of the phase, or Similar to the periodic phase difference relationship point, the lowest value at this time is 1+1 / 2 times the highest amplitude of the phase voltage, and the instantaneous lowest point in a certain interval should be 0°, 60°, 120°, 180° of the phase °, 240°, 300° points, or similar periodic phase difference relationship points, the lowest value at this time is times the maximum amplitude of the phase voltage; for details, please refer to Figure 5 , such as t...

Embodiment 3

[0086] Such as Figure 15 As shown, this embodiment proposes a modified embodiment of the three-phase AC-DC buck-boost conversion circuit according to Embodiment 1, including at least two three-phase AC-DC buck-boost conversion circuits as described above in parallel, and each of the three The switch tube drives between the intersecting DC buck-boost conversion circuits work in an interleaved mode. In order to make the AC input current continuous.

[0087] Through the aforementioned "long" and "short" drive signal control methods, at least two (denoted as N) three-phase AC-DC buck-boost converters connected in parallel can be controlled respectively, and N three-phase AC-DC buck-boost converters connected in parallel The working phase of the converters differs by 1 / N high-frequency cycles; in addition, the positive and negative side inductor current balance control is added to the control algorithm to avoid the current loop crossing in each converter caused by parallel connec...

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Abstract

The invention discloses a three-phase alternating direct current voltage boost-buck conversion circuit and a control method thereof, A three-phase alternating-current step-up / step-down converter include an input switch tube set, a rectifier switch unit and an energy storage freewheeling unit, the input switch tube group comprising first to third switch tubes, the rectifier switch unit comprising first to sixth diodes, fourth to sixth switch tubes, the energy storage freewheeling unit comprising seventh diodes, eighth diodes, seventh switch tubes, first to second freewheeling inductors and capacitors. The conversion circuit of the invention has a simple structure and a relatively simple control method, so that the advantages are obvious when the output voltage range of small and medium power is wide and high efficiency and high power density are required.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a three-phase AC-DC buck-boost conversion circuit and a control method thereof. Background technique [0002] Due to the increasing requirements of national regulations or the power system environment on electrical equipment, the single-phase power supply method of single-phase power supply for single-phase power supply equipment exceeding a certain power level is gradually changed to three-phase power supply, and power factor correction is required to ensure Grid power quality and reduce the impact on the grid. For example, the early electric vehicle charger was only 3.3KW, and then gradually increased to 6.6KW, 10KW or even higher. If there is no power factor correction (PFC) function, the power quality of the grid will be affected. The damage is very large, and even the power grid will be paralyzed when it is serious. [0003] In addition, the output voltage range of the equi...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M3/155
CPCH02M3/155H02M7/217
Inventor 李伦全刘斌李伦武
Owner NANJING PANDA ELECTRONICS
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