CN102710156A - Input-stage circuit for intelligent transformer - Google Patents
Input-stage circuit for intelligent transformer Download PDFInfo
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- CN102710156A CN102710156A CN2012101921029A CN201210192102A CN102710156A CN 102710156 A CN102710156 A CN 102710156A CN 2012101921029 A CN2012101921029 A CN 2012101921029A CN 201210192102 A CN201210192102 A CN 201210192102A CN 102710156 A CN102710156 A CN 102710156A
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Abstract
The invention discloses an input-stage circuit for an intelligent transformer. The input-stage circuit is characterized by comprising three parallel bridge arms and three anti-parallel diode duplex tubes, wherein each bridge arm is formed by connecting two IGBT (Insulated Gate Bipolar Transistor) duplex tubes in series; and intermediate taps of the two IGBT duplex tubes on each bridge arm are connected with one anti-parallel diode duplex tube. According to the input-stage circuit, the input voltage grade can be effectively improved and the loss of a switch is reduced.
Description
Technical field
The present invention relates to the intelligent transformer field, particularly a kind of input stage circuit that is used for intelligent transformer.
Background technology
Intelligent transformer is realized voltage transformation and NE BY ENERGY TRANSFER in the electric power system through Technics of Power Electronic Conversion technology and high frequency transformer; Former secondary voltage amplitude of control transformer and phase place flexibly; Has higher stability; Can integrate various alternating current-direct current distributed power sources, and the real-time control that realizes power flow under the electricity market, very wide application prospect had.Intelligent transformer generally constitutes by three grades; Be input stage, isolation level and output stage; Control side sieve that comprises circuit topology and device for power switching; The performance of each grade all influences the whole performance of intelligent transformer to some extent, and the technical essential that need consider in the time of design mainly comprises electric pressure, switching loss and the integrity problem of input and output.
In order to realize the voltage after the conversion, all be to adopt the technical scheme of directly using copped wave to realize DC-DC in the prior art, but this technical scheme can not be effectively conversion direct voltage grade as required.
Summary of the invention
The technical problem that (one) will solve
The technical problem that the present invention will solve is: how a kind of input stage circuit is provided, can effectively improves the input voltage grade, and reduce switching loss.
(2) technical scheme
For solving the problems of the technologies described above; The invention provides a kind of input stage circuit that is used for intelligent transformer; This circuit comprises that the brachium pontis of three parallel connections, three inverse parallel diodes are two-tube; Wherein each brachium pontis is made up of 2 IGBT double-tube series, and 2 two-tube centres of IGBT on each brachium pontis lift one's head that to connect an inverse parallel diode two-tube.
Further, the input of said input stage circuit connects the ABC three-phase alternating current, and output is three level DC voltage.
Further, the corresponding intermediate voltage terminal input of centre tap that said three inverse parallel diodes are two-tube, high-pressure side and low-pressure end input be the top and bottom of corresponding brachium pontis respectively.
Further, between said high-pressure side and the intermediate voltage terminal, be connected to capacitor between said intermediate voltage terminal and the low-pressure end.
Further, the conducting of said IGBT and cut-off the employing pwm pattern.(3)
(3) beneficial effect
Effectively improve the input voltage grade, reduce switching loss, can guarantee the current waveform that grid side is good, and can guarantee that the power factor between current on line side and the power supply is 1.
Description of drawings
Fig. 1 is a circuit structure diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
The present invention provides a kind of input stage circuit scheme of intelligent transformer, based on three level topology design, adopts full bridge rectifier to realize the AC-DC function of input stage, can effectively improve the input voltage grade, and reduce switching loss.
Embodiment 1
Of Fig. 1, each brachium pontis is by 2 IGBT two-tube (1) series connection, and the main body of input stage circuit is formed in parallel by three brachium pontis, and on each brachium pontis lift one's head and connect inverse parallel diode two-tube (2) in the centre of 2 IGBT two-tube (1).The input of alternating current three-phase is connected on the joint portion of IGBT two-tube (1) on three brachium pontis respectively, and three level DC output high-pressure side and low-pressure end are connected on the top and bottom of brachium pontis, and intermediate voltage terminal is connected on the centre of diode two-tube (2) and lifts one's head.Be connected to absorption capacitor (3) between high-pressure side and intermediate voltage terminal, intermediate voltage terminal and the low-pressure end, play the effect of rectifying and wave-filtering.
Each brachium pontis is made up of four IGBT, and each IGBT has the inverse parallel diode of equal-wattage grade, plays the effect of protection and afterflow.The diode inverse parallel of second and the 3rd IGBT and two other equal-wattage grade, and the piezoelectricity utmost point in the middle of diode, drawing form three level structures.Input connects the ABC three-phase alternating current, and output is three level DC voltage.Output is parallel with bigger capacitor, plays the effect of smothing filtering.The purpose of rectification is played in the conducting of IGBT and cut-off the employing pwm pattern, and the three-level pwm rectification has 27 switch vectors, therefore under switching frequency is not very high situation, also can not guarantee to net the good current waveform of side, reduces the injection of harmonic current.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (5)
1. input stage circuit that is used for intelligent transformer; It is characterized in that; This circuit comprises that the brachium pontis of three parallel connections, three inverse parallel diodes are two-tube; Wherein each brachium pontis is made up of 2 IGBT double-tube series, and 2 two-tube centres of IGBT on each brachium pontis lift one's head that to connect an inverse parallel diode two-tube.
2. circuit as claimed in claim 1, its characteristic are that also the input of said input stage circuit connects the ABC three-phase alternating current, and output is three level DC voltage.
3. circuit as claimed in claim 2, its characteristic also are, the corresponding intermediate voltage terminal input of centre tap that said three inverse parallel diodes are two-tube, and high-pressure side and low-pressure end input be the top and bottom of corresponding brachium pontis respectively.
4. circuit as claimed in claim 3, its characteristic also be, between said high-pressure side and the intermediate voltage terminal, be connected to capacitor between said intermediate voltage terminal and the low-pressure end.
5. circuit as claimed in claim 1, its characteristic also be, the conducting of said IGBT and cut-off the employing pwm pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101921029A CN102710156A (en) | 2012-06-11 | 2012-06-11 | Input-stage circuit for intelligent transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101921029A CN102710156A (en) | 2012-06-11 | 2012-06-11 | Input-stage circuit for intelligent transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102710156A true CN102710156A (en) | 2012-10-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101921029A Pending CN102710156A (en) | 2012-06-11 | 2012-06-11 | Input-stage circuit for intelligent transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102710156A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000152646A (en) * | 1998-11-16 | 2000-05-30 | Mitsubishi Electric Corp | Inverter |
| CN102223078A (en) * | 2011-06-08 | 2011-10-19 | 清华大学 | Power electronic transformer aiming at distribution network and control method of power electronic transformer |
-
2012
- 2012-06-11 CN CN2012101921029A patent/CN102710156A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000152646A (en) * | 1998-11-16 | 2000-05-30 | Mitsubishi Electric Corp | Inverter |
| CN102223078A (en) * | 2011-06-08 | 2011-10-19 | 清华大学 | Power electronic transformer aiming at distribution network and control method of power electronic transformer |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121003 |