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High-power-factor three-phase rectifier circuit and control method

A high power factor, three-phase rectification technology, applied in the direction of AC power input conversion to DC power output, high-efficiency power electronic conversion, output power conversion devices, etc., to achieve the effect of wide control range

Inactive Publication Date: 2015-07-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention not only solves the problem of capacitance withstand voltage, but also can realize power factor regulation well by changing the control program for different loads

Method used

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  • High-power-factor three-phase rectifier circuit and control method
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  • High-power-factor three-phase rectifier circuit and control method

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the implementation and protection of the present invention are not limited thereto. If there are no specific details below, those skilled in the art can refer to the prior art.

[0019] figure 1An overall structure diagram of a three-phase rectifier as an example of the present invention is given, which includes a main circuit, an auxiliary power supply module, a single-chip microcomputer control module (commonly used single-chip microcomputers can be used), and a drive module. The main circuit includes the first to sixth switch tubes Q1~Q6, the first to twelfth diodes VD1~VD12, the first to fifth capacitors C1~C5, the first inductance L, the load, the first to the third voltage sensors, first and second current sensors. Three-phase power supply, first and second voltage sensors, first and second current sensors, three-phase rectifier bridge...

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Abstract

The invention discloses a high-power-factor three-phase rectifier circuit and a control method thereof. The rectifier circuit comprises a two-way switch circuit, a main circuit, a sampling circuit, an auxiliary power supply module, a single chip microcomputer control module and a drive module, wherein input of the auxiliary power supply module is connected to mains supply, output of the auxiliary power supply module is connected with power input ends of the single chip microcomputer control module and the drive module respectively, the single chip microcomputer control module samples input-phase voltage, input-phase current and output voltage of the main circuit, input of the drive module is connected to a drive signal output end of the single chip microcomputer control module, and output of the drive module is connected with gate poles of six switch tubes in the main circuit. According to an adjusting method, different loads can be automatically adjusted, and the rectifier circuit is mainly applied to reactive compensation of equipment such as a transformer, an electrical motor, a fluorescent lamp, an electric-arc furnace and the like loaded with inductive electric power in a power grid. Through power factor adjustment, the load is a pure resistive load, that is, load voltage and current are in the same phase.

Description

technical field [0001] The invention relates to the field of power electronic AC technology, in particular to a three-phase rectifier circuit with high power factor, which belongs to the field of power electronic AC technology, and can be used for inductive power loads in power grids such as transformers, motors, sunlight and electric arc furnaces and other equipment A three-phase rectification circuit for reactive power compensation and a control method thereof. Background technique [0002] At present, reactive power compensation can be divided into high-voltage reactive power compensation and low-voltage reactive power compensation. Installing a reactive power compensation device at the high voltage is expensive, and the compensation effect is not obvious. The methods of low-voltage reactive power compensation can be divided into centralized compensation and local compensation. Reactive power compensation devices can be divided into static, dynamic and static plus dynam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M7/162
CPCY02B70/10
Inventor 康龙云李臻黄志臻
Owner SOUTH CHINA UNIV OF TECH
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