AC chopper-full bridge rectified ac-dc converter

A technology of full-bridge rectification and AC chopping, which is applied in the direction of conversion of AC power input to AC power output, conversion of AC power input to DC power output, and conversion equipment that can be converted to DC without intermediate conversion, and can solve the feasibility Low cost, complex structure, high difficulty in control, etc., to achieve the effect of economy and practicality, small system size, and simplified circuit structure

Inactive Publication Date: 2011-12-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] After searching the existing technology, it is found that Chinese patent application number 02139030.4, publication date: 2003.03.12. records a "power electronic transformer", the technology power The electronic transformer is based on the three-phase-three-phase matrix converter structure, the intermediate link is very complicated, the realization is very difficult, the economy is low, and it is difficult to realize and promote the application
[0004] Further search found that Chinese patent application number 200910025824.3, publication date: 2009.11.04. It records a "multifunctional power electronic tra

Method used

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Embodiment 1

[0028] Such as figure 1 As shown, this embodiment includes: a step-down circuit 1 and a rectifier circuit 2 connected thereto, wherein: the step-down circuit 1 Convert high-voltage power frequency AC voltage into low-voltage high-frequency AC voltage. In the rectifier circuit 2, the low-voltage high-frequency AC voltage is converted into a low-voltage DC voltage, and a linear input impedance and a linear grid-side impedance are obtained to ensure a good grid-side power factor.

[0029] The step-down circuit 1 includes an input filter connected in sequence, an AC chopper BS1, and a high-frequency transformer for step-down T1 and output filter C2.

[0030] The 1-input filter used in the step-down circuit is composed of an LC filter (shown as L1 and C1 in the figure), The input end is connected to the AC power supply, and the output end is connected to the AC chopper BS1 The two inputs are connected.

[0031] Such as figure 2 As shown, the AC chopper used in step-dow...

Embodiment 2

[0042] Such as Figure 4 As shown, the schematic diagram of the three-phase input and output parallel AC chopper-full bridge rectifier AC-DC converter. each of them AC Chopper-Full Bridge Rectification AC-DC Converter The input terminals of the three-phase alternating current are respectively connected to any two phases, the three groups AC Chopper-Full Bridge Rectification AC-DC Converter The output terminals are connected in parallel and output DC voltage.

[0043] This embodiment can avoid excitation saturation of the transformer and support greater power output.

Embodiment 3

[0045] Such as Figure 5 As shown, a schematic diagram of an AC-DC converter with AC chopper-full-bridge rectification in series input and series output. consists of three groups of the same structure AC Chopper-Full Bridge Rectification AC-DC Converter Composition, the three groups AC Chopper-Full Bridge Rectification AC-DC Converter The input ends are connected in series, and the output ends are connected in series to output DC voltage.

[0046] This embodiment can avoid excitation saturation of the transformer, and realize high voltage input and greater power output.

[0047] After the device adopts a step-down circuit and a rectifier circuit, it can make the grid side of the power electronic converter work under the unit power factor, eliminate the pollution of the harmonic current to the grid, and at the same time make the reactive current content of each point on the line before the rectifier circuit It is beneficial to simplify circuit design, reduce cost, inc...

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Abstract

The invention discloses an AC chopper-full bridge rectification AC-DC converter in the technical field of power electronic conversion, comprising: a step-down circuit and a rectifier circuit or an impedance conversion circuit connected in series in sequence, and the step-down circuit is converted by an AC chopper The high-voltage power-frequency AC voltage is transformed into a high-voltage and high-frequency pulsed AC voltage, and the low-voltage and high-frequency pulsed AC voltage is obtained through step-down transformer step-down; the rectification circuit or impedance transformation circuit rectifies the output low-voltage and high-frequency pulsed AC voltage to obtain a stable The DC output and linear input impedance are reflected to the high-voltage AC grid to obtain linear input impedance and unit input power factor. The invention realizes the conversion of high-voltage AC voltage to low-voltage DC voltage through a step-down circuit and a rectifier circuit, and has the advantages of fewer power devices, simple overall structure and more perfect overall performance.

Description

technical field [0001] The invention relates to a device in the technical field of power electronic conversion, in particular to an AC-DC converter of AC chopping and full-bridge rectification. Background technique [0002] Power electronic transformers are mainly composed of power electronic converters, high-frequency transformers and controllers. These include: the power electronic converter of high-frequency and high-power power electronic devices such as IGBT or IGCT is the core of the power electronic transformer, and its function is to complete the frequency and amplitude conversion of electric energy; the function of the high-frequency transformer is isolation and voltage transformation; control The function of the inverter is to realize the control of power conversion, voltage stability and power quality. [0003] After searching the existing technology, it was found that Chinese patent application No. 02139030.4, publication date: 2003.03.12, recorded a "power elec...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M5/293H02M5/10H02M7/219
Inventor 马红星李华武曹中圣杨喜军
Owner SHANGHAI JIAO TONG UNIV
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