CN101252338A - High power multi-bridge arm frequency converter - Google Patents
High power multi-bridge arm frequency converter Download PDFInfo
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- CN101252338A CN101252338A CNA200710115194XA CN200710115194A CN101252338A CN 101252338 A CN101252338 A CN 101252338A CN A200710115194X A CNA200710115194X A CN A200710115194XA CN 200710115194 A CN200710115194 A CN 200710115194A CN 101252338 A CN101252338 A CN 101252338A
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- circuit
- brachium pontis
- group
- bridge arm
- frequency converter
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Abstract
The invention discloses a frequency conversion speeder for a big-power motor with multiple bridge arms. The frequency conversion speeder comprises a power transformer, a rectifier circuit, a filter circuit and an inverter circuit; the secondary side of the power transformer is connected with the rectifier circuit; the filter circuit and the inverter circuit are connected in parallel between the positive generatrix(P+) and the negative generatrix(P-) of the rectifier circuit. The filter circuit comprises a filter capacitor and the inverter circuit comprises n(n is a natural number more than 3) bridge arms, each composed of two controllable pieces which are connected in series; voltage output is connected between the two controllable pieces which are connected in series. The frequency conversion speeder can realize bridge arm division according the volume of the power, thus solving the problems in speed regulation of a multi-phase motor.
Description
(1) technical field
The present invention relates to a kind of frequency converter, particularly a kind of high power multi-bridge arm motor frequency change speed regulating device.
(2) background technology
At present, in the prior art, high power motor can be the three-phase high voltage, also can be heterogeneous low-voltage.The withstand voltage of modern power electronic device is conditional, so multiphase motor can be used for large-power occasions as six phases, nine phases even 15 phase motor, the speed governing of multiphase motor just needed multi-bridge arm frequency converter.
(3) summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of required many brachium pontis converter plant of multiphase motor speed governing that solves is provided.
The present invention is achieved by the following technical solutions:
High power multi-bridge arm frequency converter of the present invention, comprise power transformer, rectification circuit, filter circuit and inverter circuit, the secondary of described power transformer connects rectification circuit, be parallel with filter circuit and inverter circuit between positive bus-bar of described rectification circuit (P+) and the negative busbar (P-), described filter circuit is made up of a filter capacitor, described inverter circuit contains the brachium pontis that two controllable devices are composed in series by n to be formed, n is the natural number greater than 3, connect voltage output between described two series connection controllable devices, a controllable devices collector electrode is connected to the positive bus-bar (P+) of rectification circuit in the controllable devices of described two series connection, and another controllable devices emitter is connected to the negative busbar (P-) of rectification circuit.
The described inverter circuit of high power multi-bridge arm frequency converter of the present invention can be made up of n=6,9 or 15 brachium pontis.
High power multi-bridge arm frequency converter of the present invention, the secondary of described power transformer has m winding, the brachium pontis of described inverter circuit is divided into m group brachium pontis, above-described m is the natural number greater than 1, described every group of brachium pontis filter circuit all in parallel, every group of brachium pontis respectively is connected with the secondary winding of a power transformer by a rectification circuit.
High power multi-bridge arm frequency converter of the present invention, the brachium pontis of described inverter circuit are divided into L group brachium pontis, each filter circuit in parallel of described every group of brachium pontis, and described L group brachium pontis is connected with the secondary of a power transformer by a rectification circuit.
The invention has the beneficial effects as follows:
(1) can solve the frequency control of multiphase motor, when motor moves in small-power, also can not divide into groups, when high-power operation, can be according to the size packets of gross power.
(2) input transformer adopts the many windings of secondary, can reduce Harmonics of Input, reduces the pollution to electrical network.
(3) a plurality of brachium pontis adopt same carrier wave, and differing of each brachium pontis is the same with differing of multiphase motor, so just can well control multiphase motor.
(4) description of drawings
Fig. 1 is the shared one group of rectification circuit inverter schematic diagram of the present invention;
Fig. 2 divides the inverter schematic diagram of two groups of rectification circuits for the present invention;
Fig. 3 is the rectification circuit schematic diagram of the present invention's two groupings.
(5) embodiment
Below in conjunction with accompanying drawing the present invention is specified.
Embodiment 1:
Fig. 1 is shared one group of rectification circuit inverter schematic diagram, high power multi-bridge arm frequency converter of the present invention, comprise power transformer, rectification circuit, filter circuit, inverter circuit, as shown in Figure 1, the inverter circuit syndeton of shared one group of rectification circuit is, controllable devices S1, S2 connect with the form of series connection, and the collector electrode of its S1 is connected to positive bus-bar P+, emitter is connected with the collector electrode of S2, and the emitter of S2 is connected to negative busbar P-.Between the emitter of S1 and the collector electrode of S2 voltage output point U1.Controllable devices S3, S4 form second brachium pontis, and the collector electrode of its S3 is connected to positive bus-bar P+, and emitter is connected with the collector electrode of S4, and the emitter of S4 is connected to negative busbar P-.Between the emitter of S3 and the collector electrode of S4 voltage output point U2.Controllable devices S2n-3, S2n-2 form n-1 brachium pontis, and the collector electrode of its S2n-3 is connected to positive bus-bar P+, and emitter is connected with the collector electrode of S2n-2, and the emitter of S2n-2 is connected to negative busbar P-.Between the emitter of S2n-3 and the collector electrode of S2n-2 voltage output point Un-1.N brachium pontis is identical with n-1 the brachium pontis structure that S2n-3, S2n-2 form, and the voltage output point is Un.The filter capacitor C of described filter circuit is connected between the positive and negative busbar of rectification circuit, and described rectification circuit connects power transformer secondary winding, and the converter circuit of so shared one group of rectification circuit is even good.
Embodiment 2:
Fig. 2 is for dividing the inverter schematic diagram of two groups of rectification circuits, Fig. 3 is the rectification circuit schematic diagram of two groupings, as shown in Figure 2, it is the inverter of two groups of rectification circuits of branch, its brachium pontis version is identical with Fig. 1 among the embodiment one, every group of brachium pontis adopts independently rectifier power source, and filter capacitor C1, C2 are connected between separately the power supply positive and negative busbar.
As shown in Figure 3, the connection of two secondary winding T2, T3 of power transformer is, T2 is a delta connection, and T3 is a star connection.The three phase rectifier filtering device of T2 group is connected into three-phase bridge rectification by diode, and its power positive end is P1+, and power supply negative terminal is P1-.The three phase rectifier filtering device of T3 group is connected into three-phase bridge rectification by diode equally, and its power positive end is P2+, and power supply negative terminal is P2-.
The brachium pontis of one group of inverter circuit in two groups of each map interlinkings 2 of rectification circuit among Fig. 3 has promptly formed the converter circuit of inverter circuit brachium pontis two groupings.
Claims (4)
1, a kind of high power multi-bridge arm frequency converter, comprise power transformer, rectification circuit, filter circuit, inverter circuit, it is characterized in that: the secondary of described power transformer connects rectification circuit, be parallel with filter circuit and inverter circuit between positive bus-bar of described rectification circuit (P+) and the negative busbar (P-), described filter circuit is made up of a filter capacitor, described inverter circuit contains the brachium pontis that two controllable devices are composed in series by n to be formed, n is the natural number greater than 3, connect voltage output between described two series connection controllable devices, a controllable devices collector electrode is connected to the positive bus-bar (P+) of rectification circuit in the controllable devices of two series connection, and another controllable devices emitter is connected to the negative busbar (P-) of rectification circuit.
2, high power multi-bridge arm frequency converter according to claim 1 is characterized in that: n=6,9 or 15.
3, high power multi-bridge arm frequency converter according to claim 1 and 2, it is characterized in that: the secondary of described power transformer has m winding, the brachium pontis of described inverter circuit is divided into the m group, above-described m is the natural number greater than 1, described every group of brachium pontis filter circuit all in parallel, described every group of brachium pontis respectively are connected with the secondary winding of a power transformer by a rectification circuit.
4, high power multi-bridge arm frequency converter according to claim 1 and 2, it is characterized in that: the brachium pontis of described inverter circuit is divided into L group brachium pontis, described L is the natural number greater than 1, described every group of brachium pontis filter circuit all in parallel, described L group brachium pontis is connected with the secondary winding of a power transformer by a rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710115194XA CN101252338A (en) | 2007-12-14 | 2007-12-14 | High power multi-bridge arm frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710115194XA CN101252338A (en) | 2007-12-14 | 2007-12-14 | High power multi-bridge arm frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101252338A true CN101252338A (en) | 2008-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200710115194XA Pending CN101252338A (en) | 2007-12-14 | 2007-12-14 | High power multi-bridge arm frequency converter |
Country Status (1)
| Country | Link |
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| CN (1) | CN101252338A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104518724A (en) * | 2014-12-17 | 2015-04-15 | 中国船舶重工集团公司第七一二研究所 | 15-phase motor subchannel control system and control method |
| WO2017049859A1 (en) * | 2015-09-24 | 2017-03-30 | 卧龙电气集团股份有限公司 | High/low voltage conversion star-type multiphase variable-frequency driving system |
-
2007
- 2007-12-14 CN CNA200710115194XA patent/CN101252338A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104518724A (en) * | 2014-12-17 | 2015-04-15 | 中国船舶重工集团公司第七一二研究所 | 15-phase motor subchannel control system and control method |
| WO2017049859A1 (en) * | 2015-09-24 | 2017-03-30 | 卧龙电气集团股份有限公司 | High/low voltage conversion star-type multiphase variable-frequency driving system |
| US10305409B2 (en) | 2015-09-24 | 2019-05-28 | Wolong Electric Group Co., Ltd. | High-low-voltage conversion star multi-phase variable-frequency drive system |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080827 |