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Alternating current-direct current (AC-DC) converter and frequency converter

An AC-DC converter technology, applied in the field of frequency converters, can solve the problem of high cost, achieve the effect of low cost, improve power factor and power factor guarantee

Inactive Publication Date: 2011-05-11
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rectifier consists of a three-phase IGBT bridge and a three-phase inductor, and a complex control algorithm is required to generate the IGBT drive signal, so the cost is very high

Method used

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  • Alternating current-direct current (AC-DC) converter and frequency converter
  • Alternating current-direct current (AC-DC) converter and frequency converter
  • Alternating current-direct current (AC-DC) converter and frequency converter

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Embodiment Construction

[0031] Aiming at the problems existing in the prior art, the present invention proposes a brand-new AC-DC converter structure, which can not only improve the power factor, but also has the function of energy recovery, and the cost is low.

[0032] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0033] Figure 5 It is a structural schematic diagram of a frequency converter with the AC-DC converter of the present invention. Such as Figure 5 As shown, the frequency converter is mainly composed of three parts: an AC-DC converter, a capacitor and an IGBT-based frequency converter. The functions of the capacitor and the IGBT-based frequency converter are the sam...

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Abstract

The invention discloses an alternating current-direct current (AC-DC) converter which comprises a converter based on a three-phase thyristor, a full-bridge converter based on a simplified insulated gate bipolar transistor (IGBT) and an inductor connected between the converter and the full-bridge converter, wherein in a driving mode, the converter based on the three-phase thyristor works in an AC-DC rectifier mode, and the full-bridge converter based on the simplified IGBT works in a boost chopper circuit mode and controls the inductor to suppress current harmonics of the power supply network so as to increase the power factor; and in a regenerative braking mode, the converter based on the three-phase thyristor feeds the regenerated energy back to the power supply system so as to realize energy recovery. The invention also discloses a frequency converter. By using the scheme, the power factor can be increased, energy recovery can be realized, and the implementation cost is low.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to an AC-DC converter and a frequency converter including the AC-DC converter. Background technique [0002] At present, variable frequency speed regulation motor drives (frequency converters) have been widely used in various industrial fields, mainly for precise speed control or energy saving. Due to the simple structure and low cost, in most frequency converters, a diode bridge rectifier is used to convert an alternating current (AC, Alternating Current) to a direct current (DC, direct current). figure 1 It is a structural schematic diagram of an existing frequency converter in common use. Such as figure 1 As shown, a diode bridge rectifier is used to process the conversion from AC to DC, and a frequency converter based on an insulated gate bipolar transistor (IGBT, Insulated Gate Bipolar Transisitor) is used to process the conversion from DC to AC. [0003] However, diode bridg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12H02M5/44
CPCH02M7/757H02M1/007
Inventor 姚吉隆吴学智赵研峰克晶宋英华
Owner SIEMENS AG
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