CN103208913B - Filtering reactance level and variable frequency driving system using same - Google Patents
Filtering reactance level and variable frequency driving system using same Download PDFInfo
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- CN103208913B CN103208913B CN201210008662.4A CN201210008662A CN103208913B CN 103208913 B CN103208913 B CN 103208913B CN 201210008662 A CN201210008662 A CN 201210008662A CN 103208913 B CN103208913 B CN 103208913B
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Abstract
The invention discloses a filtering reactance level and a variable frequency driving system using same. The variable frequency driving system using the filtering reactance level comprises a rectifying input level, an inverter output level and a filtering reactance level. The filtering reactance level which is coupled between the rectifying input level and the inverter output level and comprises a magnetic core module, a first winding group, a second winding group and a third winding group. The magnetic core module comprises a middle column, a first edge column and a second edge column. The first winding group is wound on the first edge column, the second winding column is wound on the second edge column, and the first winding group and the second winding group are in series connection with a first direct current arm which is arranged between the rectifying input level and the inverter output level. The third winding group is wound on the middle column and two ends of the third winding group are in series connection with a second direct current arm between the rectifying input circuit and the inverter output circuit. The three winding groups of the filtering reactance level are capable of supplying enough common mode choke to restrain common mode currents and form adjustable different mode inductance to reduce energy loss of a filtering reactance.
Description
Technical field
The present invention about a kind of filter reactance level, and especially in regard to a kind of filter reactance level be applied in frequency changing driving system.
Background technology
In the middle of the control of motor machine or induction motor, it is an important problem that the speed of motor regulates, the Traditional DC speed adjusting technique adopted in existing motor machine, because hardware volume is large and failure rate is high and it is limited to make it apply.
Frequency converter (Variable-frequency Drive, VFD), application converter technique and electronics active member technology, pass from the frequency of the working power of input and the mode of amplitude by changing, to control the output of alternating current motor.
The effect of frequency converter changes the frequency and amplitude that supply the AC power of giving induction motor, changes the cycle of its moving magnetic field further, reach the object that level and smooth Perceived control answers motor rotary speed.The appearance of frequency converter, makes complicated speed regulating control simplify, and coordinates the most of work that originally can only complete with direct current machine of AC system induction motor combination replacement, make Circuits System be able to reduced volume and reduce maintenance rate with frequency converter.
Existing a kind of frequency converter generally includes rectifier and inverter, and may there is current ripple noise during signal transmission betwixt, the common practice on monolateral direct current arm, arranges an inductance, with filtering current ripple noise.But on two direct current arms, generation common mode current is flowed to inverter by rectifier during frequency converter running, common mode current will produce unnecessary electromagnetic interference (Electromagnetic interference, EMI) by for during practical operation.Traditional common mode current solution arranges inductor all respectively to reduce common mode current on two direct current arms, and then suppress electromagnetic interference.But the inhibition of the inductor in traditional method to common mode current is limited.
Summary of the invention
For solving the problem, the object of the present invention is to provide a kind of filter reactance level and apply the frequency changing driving system of this filter reactance level, wherein, this filter reactance level can produce enough common mode inductances to suppress common mode current and to form adjustable differential mode inductance, to reduce the energy loss of filter reactance.
Filter reactance level in a preferred embodiment of the present invention has three groups of coiling groups, wherein two groups of coiling groups be coupled to frequency changing driving system a direct current arm on and be wound in the both sides side column of magnetic core module respectively, another direct current arm that another group coiling group is coupled to frequency changing driving system is wound on the center pillar of magnetic core module.Under common-mode state, the magnetic flux of three coiling groups adds up mutually; Under differential mode state, on two coiling groups on side column and center pillar, the magnetic flux of coiling group is cancelled out each other.Thus, three coiling groups can provide enough common mode inductance to suppress common mode current, and form less differential mode inductance, to reduce the energy loss of filter reactance.
In a preferred embodiment, the invention provides a kind of frequency changing driving system, itself and a three phase network couple, and this frequency changing driving system comprises rectification input stage, inversion output stage and filter reactance level.Rectification input stage and this three phase network couple.Filter reactance level is coupled between this rectification input stage and this inversion output stage, and this filter reactance level comprises magnetic core module, the first coiling group, the second coiling group and the 3rd coiling group.Magnetic core module comprises center pillar, the first side column and the second side column.This first coiling group is wound on this first side column, and this second coiling group is wound on this second side column, and this first coiling group and this second coiling group are serially connected with the first direct current arm between this rectification input stage and this inversion output stage.3rd coiling group is wound in this center pillar, and the two ends of the 3rd coiling group are serially connected with on one second direct current arm between this rectification input stage and this inversion output stage.
In a preferred embodiment, this rectification input stage is in order to be converted to a direct voltage by biography from an AC-input voltage with steady job frequency of this three phase network, this inversion output stage is in order to be converted to an ac output voltage with variable frequency by this direct voltage, this ac output voltage is in order to drive an external loading.
In a preferred embodiment, in this magnetic core module, this center pillar, this first side column and this second side column are almost parallel, and this first side column and this second side column are positioned at the both sides of this center pillar.
In a preferred embodiment, the magnetic flux that this first coiling group and this second coiling group produce under a differential mode state in the same way, and is oppositely offset with the magnetic flux that the 3rd coiling group produces.In this embodiment, under differential mode state, this first direct current arm is contrary with the differential-mode current direction on this second direct current arm.
In a preferred embodiment, the magnetic flux that this first coiling group, this second coiling group and the 3rd coiling group produce under a common-mode state in the same way.In this embodiment, under common-mode state, this first direct current arm is identical with the common mode current direction on this second direct current arm, and flows to this inversion output stage by this rectification input stage.
In a preferred embodiment, this magnetic core module is any one in the combined magnetic core of EI, the combined magnetic core of EE.
In a preferred embodiment, the present invention also provides a kind of filter reactance level, couples between a rectification input stage and an inversion output stage, and this filter reactance level comprises magnetic core module, the first coiling group, the second coiling group and the 3rd coiling group.Magnetic core module comprises a center pillar, one first side column and one second side column.This first coiling group is wound in this first side column, and this second coiling group is wound in this second side column, and this first coiling group and this second coiling group are serially connected with on one first direct current arm between this rectification input stage and this inversion output stage.3rd coiling group is wound in this center pillar, and the 3rd coiling group is serially connected with on one second direct current arm between this rectification input stage and this inversion output stage.
In a preferred embodiment, in this magnetic core module, this center pillar, this first side column and this second side column are almost parallel, and this first side column and this second side column are positioned at the both sides of this center pillar.
In a preferred embodiment, the magnetic flux that this first coiling group and this second coiling group produce under a differential mode state in the same way, and is oppositely offset with the magnetic flux that the 3rd coiling group produces.Under differential mode state, this first direct current arm is contrary with the differential-mode current direction on this second direct current arm.
In a preferred embodiment, the magnetic flux that this first coiling group, this second coiling group and the 3rd coiling group produce under a common-mode state in the same way.Under common-mode state, this first direct current arm is identical with the common mode current direction on this second direct current arm, and flows to this inversion output stage by this rectification input stage.
Filter reactance level of the present invention has three coiling groups, and three coiling groups can provide enough common mode inductance to suppress common mode current, and form adjustable differential mode inductance, to reduce the energy loss of filter reactance.
Accompanying drawing explanation
For the above and other object of content of the present invention, feature, advantage and embodiment can be become apparent, being described as follows of institute's accompanying drawings:
Figure 1 shows that the functional block diagram of a kind of frequency changing driving system according to a preferred embodiment of the present invention;
Figure 2 shows that the circuit diagram of frequency changing driving system according to a preferred embodiment of the present invention;
Figure 3 shows that the schematic diagram of filter reactance level according to a preferred embodiment of the present invention;
Figure 4 shows that the schematic diagram of filter reactance level under differential mode state in Fig. 3;
Figure 5 shows that the schematic diagram of filter reactance level under common-mode state in Fig. 3.
Wherein, description of reference numerals is as follows:
100: frequency changing driving system
120: rectification input stage
140: inversion output stage
160: filter reactance level
200: three phase network
220: motor load
180: energy-storage module
D1: the first direct current arm
D2: the second direct current arm
W1: the first coiling group
W2: the second coiling group
W3: the three coiling group
162: magnetic core module
162a, 162b: core assembly
164: the first side columns
166: the second side columns
168: center pillar
Id: differential-mode current
Ic1, Ic2: common mode current
FD1, FD2, FD3, FC1, FC2, FC3: magnetic flux
Embodiment
Refer to Fig. 1, it is the functional block diagram of a kind of frequency conversion drive (Variable-frequency Drive, the VFD) system 100 in a preferred embodiment of the present invention.As shown in Figure 1, frequency changing driving system 100 comprises rectification input stage 120, inversion output stage 140 and filter reactance level 160.
In this preferred embodiment, frequency changing driving system 100 can receive the AC-input voltage with steady job frequency by three phase network 200, and adjust frequency and the amplitude of AC-input voltage, recycle adjusted ac output voltage and drive outside motor load 220 (as induction motor), thus, the rotating speed of motor load 220 can just be controlled smoothly.
From the above, rectification input stage 120 is electrically connected three phase network 200.Rectification input stage 120 is converted to DC input voitage in order to the AC-input voltage that biography is had steady job frequency from three phase network 200, inversion output stage 140 is in order to convert the ac output voltage with variable frequency to by DC input voitage, this ac output voltage is in order to drive motor load 220.
What should be specified is, in this preferred embodiment, filter reactance level 160 is coupled with between rectification input stage 120 and inversion output stage 140, filter reactance level 160 can in order to filtering direct current ripple noise and electromagnetic interference (Electromagnetic interference, EMI), and guarantee that the electrical signals between rectification input stage 120 and inversion output stage 140 transmits quality, in this preferred embodiment, filter reactance level 160 forms adjustable differential mode inductance and common mode inductance, differential mode inductance can be used to intercept direct current ripple noise, common mode inductance then can be used to reduce electromagnetic interference.
See also Fig. 2, it is the circuit diagram of middle according to a preferred embodiment of the present invention frequency changing driving system 100.As shown in Figure 2, be electrically connected by the first direct current arm D1 and the second direct current arm D2 between rectification input stage 120 and inversion output stage 140.
Under differential mode state, differential-mode current Id flows to inversion output stage 140 along the first direct current arm D1 by rectification input stage 120, and flows to rectification input stage 120 along the second direct current arm D2 by inversion output stage 140.First direct current arm D1 flows to contrary with the differential-mode current on the second direct current arm D2.
Under common-mode state, a part of common mode current Ic1 flows to inversion output stage 140 along the first direct current arm D1 by rectification input stage 120, and the common mode current Ic2 of another part flows to inversion output stage 140 along the second direct current arm D2 by rectification input stage 120.First direct current arm D1 flows to identical with the common mode current on the second direct current arm D2.
See also Fig. 3, it is the schematic diagram of middle according to a preferred embodiment of the present invention filter reactance level 160.Filter reactance level 160 comprises magnetic core module 162, first coiling group W1, the second coiling group W2 and the 3rd coiling group W3.Wherein, magnetic core module 162 comprises center pillar 168, first side column 164 and the second side column 166.
As shown in Figure 3, center pillar 168, first side column 164 of magnetic core module 162 and the second side column 166 almost parallel, and the first side column 166 and the second side column 168 are positioned at the both sides of center pillar 166.
In this preferred embodiment, magnetic core module 162 can comprise two core assembly 162a and 162b, and wherein core assembly 162a and 162b is respectively E-type magnetic core and I type magnetic core.That is, in this preferred embodiment, magnetic core module 162 adopts the combined magnetic core of EI combined by core assembly 162a and the 162b of E type and I type.Wherein, can identical gap, interval (gap) between three arms of E-type magnetic core assembly 162a and the core assembly 162b of I type, gap arrange with magnetic adjustment on be easier to.
Specifically magnetic core module 162 of the present invention is not limited with the combined magnetic core of EI, in other preferred embodiments, magnetic core module 162 also can be the various magnetic cores of the combined magnetic core of EE or other tool equivalences.
First coiling group W1 is wound on the first side column 164, and the two ends of the first coiling group W1 are coupled on the first direct current arm D1 between rectification input stage 120 and inversion output stage 140.Second coiling group W2 is wound on the second side column 166, and the two ends of the second coiling group W2 are also coupled on the first direct current arm D1, furthermore, the two ends of this second coiling group W2 are respectively coupled to this first coiling group W1 and this inversion output stage 140, that is, the first coiling group W1 and the second coiling group W2 is serially connected with the first direct current arm D1 between rectification input stage 120 and inversion output stage 140.3rd coiling group W3 is wound on center pillar 168, and the two ends of the 3rd coiling group W3 are serially connected with on the second direct current arm D2 between rectification input stage 120 and this inversion output stage 140.
The self-induction of three coiling groups and mutual inductance can use matrix notation:
Wherein L represents self-induction, and M represents mutual inductance, and x and y is respectively the numbering of the first coiling group W1, the second coiling group W2 and the 3rd coiling group W3.
See also Fig. 4, it is depicted as the schematic diagram of filter reactance level 160 under differential mode state in Fig. 3.In the same way, and the magnetic flux FD3 that magnetic flux FD1 and magnetic flux FD2 and the 3rd coiling group W3 produces oppositely offsets the magnetic flux FD1 that first coiling group W1 produces under differential mode state and the magnetic flux FD2 that produces of the second coiling group W2.Thus, can produce and add that magnetic flux FD2 deducts magnetic flux FD3 and produces adjustable differential mode inductance by magnetic flux FD1.The size of differential mode inductance is adjusted by the coiling density of the first coiling group W1, the second coiling group W2 and the 3rd coiling group W3, the number of turn and ratio etc.
Below describe in detail, under differential mode state, the magnetic flux that two lateral coils (i.e. the first coiling group W1 and the second coiling group W2) produce and the magnetic flux that intermediate coil (i.e. the 3rd coiling group W3) produces disappear mutually in module 162, control different mode flux amount with this principle, the saturation current of differential mode inductance value and filter reactance level 160 can be designed.If represent with the inductance matrix of coiling group, then under differential mode state, inductance value is:
L
DM＝(L
11+M
12+M
13)+(L
22+M
21+M
23)+(L
33+M
31+M
32)；
And under differential mode state, M
12m
13m
21m
23m
31m
32< 0.
On the other hand, see also Fig. 5, it is depicted as the schematic diagram of filter reactance level 160 under common-mode state in Fig. 3.The magnetic flux FC2 that the magnetic flux FC1 that under common-mode state, the first coiling group W1 produces, the second coiling group W2 produce and the magnetic flux FC3 that produces of the 3rd coiling group W3 in the same way, mutually adds up and produces adjustable and the larger common mode inductance of numerical value.The size of common mode inductance is adjusted by the coiling density of the first coiling group W1, the second coiling group W2 and the 3rd coiling group W3, the number of turn and ratio etc.
Under common-mode state, the magnetic flux that three coiling groups produce equidirectional is added in magnetic core, if represent with the inductance matrix of coiling group, the common mode inductance amount formed is:
L
CM＝(L
11+M
12+M
13)+(L
22+M
21+M
23)//(L
33+M
31+M
32)；
And under common-mode state, M
12m
21< 0.
In practical application, because common mode current is little compared with differential-mode current, although magnetic flux is added, the current saturation problem of filter reactance level 160 can not be caused.
In addition, in preferred embodiment as shown in Figure 2, frequency changing driving system 100 also comprises energy-storage module 180, in practical application, energy-storage module 180 comprises capacity cell (as shown in Figure 2), the two ends of energy-storage module 180 are coupled to two direct current arms (i.e. the first direct current arm D1 and the second direct current arm D2) respectively, and energy-storage module 180 is arranged between filter reactance level 160 and inversion output stage 140, the direct voltage of energy-storage module 180 in order to produce after the rectification of temporary rectification input stage 120, and promote inversion output stage 140 with this.
In sum, filter reactance level in the present invention has three coiling groups, wherein two coiling groups be coupled to frequency changing driving system a direct current arm on and be wound in the both sides side column of magnetic core module, another direct current arm that another coiling group is coupled to frequency changing driving system is wound on the center pillar of magnetic core module.Under common-mode state, the magnetic flux of three coiling groups adds up mutually; Under differential mode state, on two coiling groups on side column and center pillar, the magnetic flux of coiling group is cancelled out each other.Thus, three coiling groups can provide enough common mode inductance to suppress common mode current, and form adjustable differential mode inductance, to reduce the energy loss of filter reactance.
Although content of the present invention discloses as above with execution mode; so itself and be not used to limit content of the present invention; anyly have the knack of this those skilled in the art; in the spirit and scope not departing from content of the present invention; when doing various change and retouching, therefore the protection range of content of the present invention is when being as the criterion depending on the accompanying claim person of defining.
Claims (12)
1. a frequency changing driving system, itself and a three phase network couple, and this frequency changing driving system comprises:
One rectification input stage, couples with this three phase network;
One inversion output stage; And
One filter reactance level, be coupled between this rectification input stage and this inversion output stage, this filter reactance level comprises:
One magnetic core module, it comprises a center pillar, one first side column and one second side column;
One first coiling group and one second coiling group, this the first coiling group is wound on this first side column, this the second coiling group is wound on this second side column, and this first coiling group and this second coiling group are serially connected with one first direct current arm between this rectification input stage and this inversion output stage; And
One the 3rd coiling group, is wound in this center pillar, and the two ends of the 3rd coiling group are serially connected with on one second direct current arm between this rectification input stage and this inversion output stage;
The magnetic flux that wherein this first coiling group and this second coiling group produce under a differential mode state in the same way, and is oppositely offset with the magnetic flux that the 3rd coiling group produces.
2. frequency changing driving system as claimed in claim 1, wherein this rectification input stage is in order to be converted to a direct voltage by biography from an AC-input voltage with steady job frequency of this three phase network, this inversion output stage is in order to be converted to an ac output voltage with variable frequency by this direct voltage, this ac output voltage is in order to drive an external loading.
3. frequency changing driving system as claimed in claim 1, wherein in this magnetic core module, this center pillar, this first side column and this second side column are almost parallel, and this first side column and this second side column are positioned at the both sides of this center pillar.
4. frequency changing driving system as claimed in claim 1, wherein under this differential mode state, this first direct current arm is contrary with the differential-mode current direction on this second direct current arm.
5. frequency changing driving system as claimed in claim 1, the magnetic flux that wherein this first coiling group, this second coiling group and the 3rd coiling group produce under a common-mode state in the same way.
6. frequency changing driving system as claimed in claim 5, wherein under this common-mode state, this first direct current arm is identical with the common mode current direction on this second direct current arm and flow to this inversion output stage by this rectification input stage.
7. frequency changing driving system as claimed in claim 1, wherein this magnetic core module is any one in the combined magnetic core of EI, the combined magnetic core of EE.
8. a filter reactance level, couple between a rectification input stage and an inversion output stage, this filter reactance level comprises:
One magnetic core module, it comprises a center pillar, one first side column and one second side column;
One first coiling group and one second coiling group, this the first coiling group is wound in this first side column, this the second coiling group is wound in this second side column, and this first coiling group and this second coiling group are serially connected with on one first direct current arm between this rectification input stage and this inversion output stage; And
One the 3rd coiling group, is wound in this center pillar, and the 3rd coiling group is serially connected with on one second direct current arm between this rectification input stage and this inversion output stage;
The magnetic flux that wherein this first coiling group and this second coiling group produce under a differential mode state in the same way, and is oppositely offset with the magnetic flux that the 3rd coiling group produces.
9. filter reactance level as claimed in claim 8, wherein in this magnetic core module, this center pillar, this first side column and this second side column are almost parallel, and this first side column and this second side column are positioned at the both sides of this center pillar.
10. filter reactance level as claimed in claim 8, wherein under this differential mode state, this first direct current arm is contrary with the differential-mode current direction on this second direct current arm.
11. filter reactance levels as claimed in claim 8, the magnetic flux that wherein this first coiling group, this second coiling group and the 3rd coiling group produce under a common-mode state in the same way.
12. filter reactance levels as claimed in claim 11, wherein under this common-mode state, this first direct current arm is identical with the common mode current direction on this second direct current arm, and flows to this inversion output stage by this rectification input stage.
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| CN201210008662.4A CN103208913B (en) | 2012-01-11 | 2012-01-11 | Filtering reactance level and variable frequency driving system using same |
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| CN201210008662.4A CN103208913B (en) | 2012-01-11 | 2012-01-11 | Filtering reactance level and variable frequency driving system using same |
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| CN103457454B (en) | 2013-08-21 | 2016-08-24 | 华为技术有限公司 | A kind of voltage changer and common-mode noise impedance adjusting method |
| CN108322950A (en) * | 2017-12-27 | 2018-07-24 | 中国船舶重工集团公司第七0研究所 | A kind of electrical heating method of no magnetic |
| CN113782320A (en) * | 2021-09-22 | 2021-12-10 | 台达电子企业管理（上海）有限公司 | Power conversion circuit |
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| US7132812B1 (en) * | 2001-04-11 | 2006-11-07 | Rockwell Automation Technologies, Inc. | Integrated DC link choke and method for suppressing common-mode voltage in a motor drive |
| CN101197205A (en) * | 2006-09-21 | 2008-06-11 | 福特环球技术公司 | Inductor topologies with substantial common mode and differential mode inductance |
| CN102136805A (en) * | 2010-01-25 | 2011-07-27 | 元宏国际股份有限公司 | AC-DC conversion device capable of filtering electromagnetic interference |
| CN202093921U (en) * | 2010-11-30 | 2011-12-28 | 薛韬 | Multiphase differential mode and common mode integrated reactor |
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| US5818705A (en) * | 1995-07-13 | 1998-10-06 | Compaq Computer Corporation | Portable computer having built-in AC adapter incorporating a space efficient electromagnetic interference filter |
| US7132812B1 (en) * | 2001-04-11 | 2006-11-07 | Rockwell Automation Technologies, Inc. | Integrated DC link choke and method for suppressing common-mode voltage in a motor drive |
| CN101197205A (en) * | 2006-09-21 | 2008-06-11 | 福特环球技术公司 | Inductor topologies with substantial common mode and differential mode inductance |
| CN102136805A (en) * | 2010-01-25 | 2011-07-27 | 元宏国际股份有限公司 | AC-DC conversion device capable of filtering electromagnetic interference |
| CN202093921U (en) * | 2010-11-30 | 2011-12-28 | 薛韬 | Multiphase differential mode and common mode integrated reactor |
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