CN103208913A - 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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- CN103208913A CN103208913A CN2012100086624A CN201210008662A CN103208913A CN 103208913 A CN103208913 A CN 103208913A CN 2012100086624 A CN2012100086624 A CN 2012100086624A CN 201210008662 A CN201210008662 A CN 201210008662A CN 103208913 A CN103208913 A CN 103208913A
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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 is about a kind of filter reactance level, and especially in regard to a kind of filter reactance level that is applied in the 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 is regulated, and the traditional DC speed regulation technology that adopts in the existing motor machine is big and failure rate is high makes its application limited because of the hardware volume.
(Variable-frequency Drive VFD), uses converter technique and electronics active member technology to frequency converter, by changing biography from the frequency of the working power of input and the mode of amplitude, with the output of control alternating current motor.
The effect of frequency converter is frequency and the amplitude that changes for the AC power of giving induction motor, further changes the cycle of its moving magnetic field, reaches the purpose of level and smooth control induction motor rotating speed.The appearance of frequency converter makes complicated speed regulating control oversimplify, and with the frequency converter most of work that originally can only finish with direct current machine that cooperated AC system induction motor combination replacement, makes Circuits System be able to reduced volume and reduces maintenance rate.
Existing a kind of frequency converter generally includes rectifier and inverter, and may there be the current ripple noise in signal betwixt when transmitting, and the common practice is at monolateral direct current arm one inductance to be set, with filtering current ripple noise.Yet the frequency converter running time will produce common mode current and flow to inverter by rectifier on two direct current arms, common mode current will produce in the time of will be for practical operation unnecessary electromagnetic interference (Electromagnetic interference, EMI).Traditional common mode current solution is on two direct current arms inductor to be set all respectively to reduce common mode current, and then suppresses electromagnetic interference.Yet the inductor in the traditional method is limited to the inhibition of common mode current.
Summary of the invention
For addressing the above problem, the object of the present invention is to provide a kind of filter reactance level and use 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 the preferred embodiment of the present invention has three groups of coiling groups, wherein two groups of coiling groups are coupled on the direct current arm of frequency changing driving system and are wound in the both sides side column of magnetic core module respectively, and another group coiling group is coupled on another direct current arm of frequency changing driving system and 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 the differential mode state, the magnetic flux of coiling group is cancelled out each other on two coiling groups on the side column and the center pillar.Thus, three coiling groups can provide enough common mode inductance suppressing 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.The 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.The magnetic core module comprises center pillar, first side column and 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.The 3rd coiling group is wound in this center pillar, and the two ends of the 3rd coiling group are serially connected with on the one second direct current arm between this rectification input stage and this inversion output stage.
In a preferred embodiment, this rectification input stage is converted to a direct current voltage in order to the AC-input voltage with steady job frequency that will pass from this three phase network, this inversion output stage is in order to be converted to this direct voltage the ac output voltage with variable frequency, and this ac output voltage is in order to drive an external loading.
In a preferred embodiment, this center pillar, this first side column and this second side column almost parallel in this magnetic core module, 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 and is oppositely offset with the magnetic flux that the 3rd coiling group produces in the same way.In this embodiment, this first direct current arm is opposite with differential-mode current direction on this second direct current arm under the differential mode state.
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, this first direct current arm is identical with common mode current direction on this second direct current arm under the common-mode state, 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 the 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.The 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 the one first direct current arm between this rectification input stage and this inversion output stage.The 3rd coiling group is wound in this center pillar, and the 3rd coiling group is serially connected with on the one second direct current arm between this rectification input stage and this inversion output stage.
In a preferred embodiment, this center pillar, this first side column and this second side column almost parallel in this magnetic core module, 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 and is oppositely offset with the magnetic flux that the 3rd coiling group produces in the same way.This first direct current arm is opposite with differential-mode current direction on this second direct current arm under the differential mode state.
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.This first direct current arm is identical with common mode current direction on this second direct current arm under the common-mode state, 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 suppressing common mode current, and form adjustable differential mode inductance, to reduce the energy loss of filter reactance.
Description of drawings
For allowing the above-mentioned of content of the present invention and other purposes, feature, advantage and embodiment can become apparent appended graphic being described as follows:
A kind of functional block diagram of frequency changing driving system in Figure 1 shows that according to a preferred embodiment of the present invention;
The circuit diagram of frequency changing driving system in Figure 2 shows that according to a preferred embodiment of the present invention;
The schematic diagram of filter reactance level in Figure 3 shows that according to a preferred embodiment of the present invention;
Figure 4 shows that the schematic diagram of filter reactance level under the differential mode state among Fig. 3;
Figure 5 shows that the schematic diagram of filter reactance level under common-mode state among Fig. 3.
Wherein, description of reference numerals is as follows:
100: frequency changing driving system
120: the rectification input stage
140: the inversion output stage
160: the 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 3rd coiling group
162: the 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
See also Fig. 1, it is a kind of frequency conversion drive (Variable-frequency Drive, VFD) functional block diagram of system 100 in the 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 frequency and the amplitude of adjustment AC-input voltage, the adjusted ac output voltage of recycling drives outside motor load 220 (as induction motor), thus, just can control the rotating speed of motor load 220 smoothly.
From the above, rectification input stage 120 electrically connects three phase network 200.Rectification input stage 120 is converted to DC input voitage in order to will pass the AC-input voltage that has a steady job frequency from three phase network 200, inversion output stage 140 is in order to convert DC input voitage to the ac output voltage with variable frequency, and this ac output voltage is in order to drive motor load 220.
What should be specified is, in this preferred embodiment, between rectification input stage 120 and inversion output stage 140, be coupled with filter reactance level 160, filter reactance level 160 can be 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 the 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, and common mode inductance then can be used to reduce electromagnetic interference.
See also Fig. 2, its be according to a preferred embodiment of the present invention in the circuit diagram of frequency changing driving system 100.As shown in Figure 2, electrically connect by the first direct current arm D1 and the second direct current arm D2 between rectification input stage 120 and the inversion output stage 140.
Under the 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.Differential-mode current on the first direct current arm D1 and the second direct current arm D2 flows to opposite.
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 another common mode current Ic2 partly flows to inversion output stage 140 along the second direct current arm D2 by rectification input stage 120.The first direct current arm D1 flows to identical with common mode current on the second direct current arm D2.
See also Fig. 3, its be according to a preferred embodiment of the present invention in the schematic diagram of filter reactance level 160.Filter reactance level 160 comprises magnetic core module 162, the 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 second side column 166.
As shown in Figure 3, the center pillar 168 of magnetic core module 162, first side column 164 and second side column, 166 almost parallels, and first side column 166 and 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 are respectively E type magnetic core and I type magnetic core.That is to say that in this preferred embodiment, magnetic core module 162 adopts by the core assembly 162a of E type and I type and the combined magnetic core of EI that 162b combines.Wherein, identical gap (gap) at interval between three arms of E type core assembly 162a and the core assembly 162b of I type arranges with the magnetic adjustment in the gap and to be easier to.
What need to specify is, magnetic core module 162 of the present invention is not limited with the combined magnetic core of EI, and 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.
The first coiling group W1 is wound on 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 the inversion output stage 140.The second coiling group W2 is wound on second side column 166, and the two ends of the second coiling group W2 also are 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 to say that the first coiling group W1 and the second coiling group W2 are serially connected with the first direct current arm D1 of 140 of rectification input stage 120 and inversion output stages.The 3rd coiling group W3 is wound on the 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 be used matrix notation:
Wherein L represents self-induction, and M represents mutual inductance, and x and y are 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 the differential mode state among Fig. 3.The magnetic flux FD2 that the magnetic flux FD1 that the first coiling group W1 produces under the differential mode state and the second coiling group W2 produce in the same way, and the magnetic flux FD3 that magnetic flux FD1 and magnetic flux FD2 and the 3rd coiling group W3 produce oppositely offsets.Thus, can produce by magnetic flux FD1 and add that magnetic flux FD2 deducts magnetic flux FD3 and produces adjustable differential mode inductance.The big I of differential mode inductance is adjusted by coiling density, the number of turn and the ratio etc. of the first coiling group W1, the second coiling group W2 and the 3rd coiling group W3.
Below describe in detail, under the differential mode state, the magnetic flux that the magnetic flux that two lateral coils (i.e. the first coiling group W1 and the second coiling group W2) produce and intermediate coil (i.e. the 3rd coiling group W3) produce disappears in module 162 mutually, with this principle control different mode flux amount, can design the saturation current of differential mode inductance value and filter reactance level 160.If represent that with the inductance matrix of coiling group then inductance value is under the differential mode state:
L
DM＝(L
11+M
12+M
13)+(L
22+M
21+M
23)+(L
33+M
31+M
32)；
And under the 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 among Fig. 3.The magnetic flux FC3 that the magnetic flux FC2 that magnetic flux FC1, the second coiling group W2 that the first coiling group W1 produces under the common-mode state produces and the 3rd coiling group W3 produce adds up mutually and produces and can adjust and common mode inductance that numerical value is bigger in the same way.The big I of common mode inductance is adjusted by coiling density, the number of turn and the ratio etc. of the first coiling group W1, the second coiling group W2 and the 3rd coiling group W3.
Under the common-mode state, three coiling groups produce magnetic flux addition in magnetic core of equidirectional, if represent that with the inductance matrix of coiling group formed common mode inductance amount 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 the practical application, because common mode current is little than the differential mode electric current, though the magnetic flux addition can not cause the current saturation problem of filter reactance level 160.
In addition, in the preferred embodiment as shown in Figure 2, frequency changing driving system 100 also comprises energy-storage module 180, in the 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 the inversion output stage 140, the direct voltage that energy-storage module 180 produces after in order to temporary rectification input stage 120 rectifications, and promote inversion output stage 140 with this.
In sum, filter reactance level among the present invention has three coiling groups, wherein two coiling groups are coupled on the direct current arm of frequency changing driving system and are wound in the both sides side column of magnetic core module, and another coiling group is coupled on another direct current arm of frequency changing driving system and 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 the differential mode state, the magnetic flux of coiling group is cancelled out each other on two coiling groups on the side column and the center pillar.Thus, three coiling groups can provide enough common mode inductance suppressing common mode current, and form adjustable differential mode inductance, to reduce the energy loss of filter reactance.
Though content of the present invention discloses as above with execution mode; so it is not in order to limit content of the present invention; anyly have the knack of this skill person; in the spirit and scope that do not break away from content of the present invention; when can doing various changes and retouching, so the protection range of content of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (14)
1. 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 is coupled between this rectification input stage and this inversion output stage, and 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 first coiling group is wound on this first side column, 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 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 the one second direct current arm between this rectification input stage and this inversion output stage.
2. frequency changing driving system as claimed in claim 1, wherein this rectification input stage is converted to a direct current voltage in order to the AC-input voltage with steady job frequency that will pass from this three phase network, this inversion output stage is in order to be converted to this direct voltage the ac output voltage with variable frequency, and this ac output voltage is in order to drive an external loading.
3. frequency changing driving system as claimed in claim 1, wherein this center pillar, this first side column and this second side column almost parallel in this magnetic core module, 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 the magnetic flux that this first coiling group and this second coiling group produce under a differential mode state and is oppositely offset with the magnetic flux that the 3rd coiling group produces in the same way.
5. frequency changing driving system as claimed in claim 4 is wherein opposite with differential-mode current direction on this second direct current arm in this first direct current arm under this differential mode state.
6. frequency changing driving system as claimed in claim 1, wherein 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.
7. frequency changing driving system as claimed in claim 6 is wherein identical with common mode current direction on this second direct current arm and flow to this inversion output stage by this rectification input stage in this first direct current arm under this common-mode state.
8. 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.
9. a filter reactance level couples between a rectification input stage and the inversion output stage, and 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 first coiling group is wound in this first side column, 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 the 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 the one second direct current arm between this rectification input stage and this inversion output stage.
10. filter reactance level as claimed in claim 9, wherein this center pillar, this first side column and this second side column almost parallel in this magnetic core module, and this first side column and this second side column are positioned at the both sides of this center pillar.
11. filter reactance level as claimed in claim 9, wherein the magnetic flux that this first coiling group and this second coiling group produce under a differential mode state and is oppositely offset with the magnetic flux that the 3rd coiling group produces in the same way.
12. filter reactance level as claimed in claim 11 is wherein opposite with differential-mode current direction on this second direct current arm in this first direct current arm under this differential mode state.
13. filter reactance level as claimed in claim 9, wherein 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.
14. filter reactance level as claimed in claim 13 is wherein identical with common mode current direction on this second direct current arm in this first direct current arm under this common-mode state, 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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| WO2015024376A1 (en) * | 2013-08-21 | 2015-02-26 | 华为技术有限公司 | Voltage converter 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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| 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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| Publication number | Publication date |
|---|---|
| CN103208913B (en) | 2015-05-20 |
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Granted publication date: 20150520 Termination date: 20190111 |