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AC Push-Pull Conversion - Buck Circuit of Full-Bridge Rectification

A step-down circuit and full-bridge rectification technology, applied in the direction of converting AC power input to DC power output, DC power input to DC power output, electrical components, etc., can solve the problems of unsuitable application occasions, poor voltage regulation and frequency conversion capabilities , Functional limitations and other issues, to achieve the effect of novel design structure, reliable pressure regulation ability, and strong versatility

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

AI Technical Summary

Problems solved by technology

The direct AC-AC converter with single-phase input has a simple circuit, easy control, and low cost, but its function is limited, its voltage regulation and frequency conversion capabilities are poor, its low-voltage ride-through ability is poor, and its input power factor is low.
If it is not handled correctly, the power factor of the power frequency high-voltage AC power supply will not be 1, and a large amount of harmonic current will cause various hazards, so it must be dealt with
The three-phase input direct AC-AC converter has complete functions and high performance, but its circuit is complicated, the control is cumbersome, the cost is high, and the low-voltage ride-through ability is poor.
The limitations of this solution make it impossible to keep up with the development of technology and cannot meet the requirements of smart grid, so it will be eliminated
[0007] In summary, the direct AC-AC converter has the disadvantages of complex control and low input power factor, and the indirect AC-AC converter needs input power factor correction to reduce Harmonic interference on the grid side is not suitable for high-voltage AC input-low-voltage AC or low-voltage DC output applications, and the traditional uncontrollable rectifier bridge PFC correction circuit cannot meet the requirements of bidirectional power flow

Method used

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  • AC Push-Pull Conversion - Buck Circuit of Full-Bridge Rectification
  • AC Push-Pull Conversion - Buck Circuit of Full-Bridge Rectification
  • AC Push-Pull Conversion - Buck Circuit of Full-Bridge Rectification

Examples

Experimental program
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Effect test

Embodiment 1

[0022] like figure 1 As shown, this embodiment provides an AC push-pull conversion-full-bridge rectification step-down circuit, including a high-frequency conversion circuit and an impedance conversion circuit 4 , the output end of the high-frequency conversion circuit is connected to the input end of the impedance conversion circuit 4 .

[0023] The high-frequency conversion circuit includes: successively cascaded filter circuits L1, C1, a first push-pull circuit 1, a transformer 2 and a second push-pull circuit 3. The output terminal of the first push-pull circuit 1 is connected to the input terminal of the impedance conversion circuit 4 through the transformer 2 and the second push-pull circuit 3 .

[0024] The transformer 2 is a primary and secondary transformer with center taps, and the leakage inductance of the primary side and the secondary side is lower than 10mH.

[0025] The filter circuit is an LC filter.

[0026] The inductor L1 is made of iron powder ...

Embodiment 2

[0039] like figure 2 As shown, this embodiment relates to a combined linear AC-DC conversion device, which is composed of three sets of AC push-pull conversion-full bridge rectification step-down circuits with the same structure, wherein each AC push-pull conversion-full bridge rectification step-down circuit The input ends of the step-down circuit are respectively connected to any two phases of the three-phase alternating current, and the output ends of the step-down circuits of the three sets of AC push-pull conversion-full-bridge rectification are connected in parallel and output a DC voltage.

[0040] This embodiment can avoid excitation saturation of the transformer, realize greater power output, and have three-phase linear input impedance characteristics at the same time.

Embodiment 3

[0042] like image 3 As shown, this embodiment relates to a combined linear AC-DC conversion device, which is composed of three sets of AC push-pull conversion-full-bridge rectification step-down circuits with the same structure, and the three sets of AC push-pull conversion-full-bridge rectification The input terminals of the step-down circuit are connected in series, and the output terminals are connected in series to output DC voltage.

[0043] This embodiment can avoid excitation saturation of the transformer, and realize high voltage input and greater power output.

[0044] The technical innovation of the step-down circuit of AC push-pull transformation-full-bridge rectification of the present invention: a push-pull circuit composed of two common emitter reverse conduction switches and a primary and secondary transformer with center taps are used to realize the conversion from high-voltage power frequency The AC voltage is transformed into a low-voltage power frequ...

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Abstract

The invention discloses an alternating-current push-pull conversion-full-bridge rectification step-down circuit in the technical field of power electronics. The step-down circuit comprises a high-frequency conversion circuit and an impedance conversion circuit, and the output end of the high-frequency conversion circuit is connected with the input end of the impedance conversion circuit; the high-frequency conversion circuit comprises a filter circuit, a transformer, a first push-pull circuit and a second push-pull circuit which are sequentially cascaded, and the primary and the secondary of the transformer are provided with center taps; the impedance conversion circuit is a fully controlled bridge type rectifier circuit, the output end of which is connected in parallel with a filter capacitor, the middle points of the two bridge arms of the bridge are respectively connected with the two alternating-current output ends of the second push-pull circuit, and the output end of the rectifier bridge outputs direct-current voltage. The step-down circuit outputs stable direct-current voltage, generates a unit input power factor at the same time, realizes flexible voltage-regulating capability, obtains linear input impedance, and overcomes the defect of mutual interference between the fluctuation of the power supply and the fluctuation of the load, and in addition, the step-down circuit supports four-quadrant operation, can feed the direct-current voltage back to an alternating-current power grid, sufficiently utilizes load side idle electric energy, and has the advantages of high universality, simple structure and low cost.

Description

technical field [0001] The present invention relates to an AC-DC converter in the technical field of power electronics, in particular to an AC push-pull conversion-full-bridge rectification step-down circuit, that is, an AC-DC converter for bidirectional flow of energy in AC conversion . Background technique [0002] With the development of my country's smart grid, the proportion of distributed power generation systems such as solar power, wind power and small hydropower in the entire energy structure is gradually increasing. Distributed power supply has small capacity, wide distribution, both AC and DC power supply, and the power supply voltage or frequency has large fluctuations. The small size, light weight, AC push-pull conversion-full bridge rectification step-down circuit can flexibly connect various distributed power sources to the power system, and has a good application prospect. [0003] The power electronic transformer with two-way flow of energy specifically in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02M3/337
CPCY02B70/1475Y02B70/10
Inventor 李华武马红星江剑锋杨喜军
Owner SHANGHAI JIAO TONG UNIV
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