CN108233355A - Common mode electromagnetic noise injection network and active Electromagnetic interference filter - Google Patents

Common mode electromagnetic noise injection network and active Electromagnetic interference filter Download PDF

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Publication number
CN108233355A
CN108233355A CN201810518652.2A CN201810518652A CN108233355A CN 108233355 A CN108233355 A CN 108233355A CN 201810518652 A CN201810518652 A CN 201810518652A CN 108233355 A CN108233355 A CN 108233355A
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electromagnetic noise
common mode
network
capacitance
input
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黄敏超
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Minye Information Technology Shanghai Co Ltd
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Minye Information Technology Shanghai Co Ltd
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Priority to CN201810518652.2A priority Critical patent/CN108233355A/en
Publication of CN108233355A publication Critical patent/CN108233355A/en
Priority to PCT/CN2019/097067 priority patent/WO2019223815A2/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/02—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Abstract

The present invention relates to a kind of common mode electromagnetic noise injection network and active Electromagnetic interference filter, which includes injection member and common mode circuit；Wherein, the injection member at least has common mode electromagnetic noise component inputs and circuit end；The common mode electromagnetic noise component inputs are used to input common mode electromagnetic noise component；The circuit end is connect with any point in the common mode circuit, for injecting the common mode electromagnetic noise component；The injection member has and only includes capacitance group or have and only include winding inductance.

Description

Common mode electromagnetic noise injection network and active Electromagnetic interference filter
Technical field
The present invention relates to technical field of filtering, are done more particularly, to a kind of common mode electromagnetic noise injection network and active Electromagnetic Disturb wave filter.
Background technology
Fig. 1 is the connection diagram of electrical equipment and electric power system, as shown in Figure 1, as electrical equipment is more and more universal, The high frequency electromagnetic noise that electrical equipment generates can not only influence the electronic equipment on periphery, but also can influence electric power system.Therefore, Electromagnetic compatibility (referred to as " EMC ") laws and regulations requirement is carried out by European Union in 1996, and mandatory requirement is necessary using the electronic equipment of public electric wire net Meet the requirement of correlation EMC regulations limit value.Wherein, electric power system can be ac power supply system or DC power-supply system.
Fig. 2 is the application schematic diagram of existing passive electromagnetic interface filter, as shown in Fig. 2, being done to meet the electromagnetism in EMC regulations It disturbs (referred to as " EMI "), almost all of electrical equipment can all use and form passive electromagnetic interface filter by passive device, be serially connected with use Between electric equipment and electric power system, to inhibit the electromagnetic noise in electrical equipment, meet the requirement of EMI regulations limitation, avoid shadow Ring electric power system.
Fig. 3 be existing common mode EMI filters schematic diagram, as shown in figure 3, the typical structure of passive electromagnetic interface filter be by Common mode EMI filters and differential mode EMI filter composition, wherein common mode EMI filters are by common mode inductance LcmAnd CYCapacitance forms.Figure 4 be the schematic diagram of existing differential mode EMI filter, as shown in figure 4, differential mode EMI filter is by differential mode inductance LdmAnd CXCapacitance forms.
Although passive electromagnetic interface filter can inhibit electromagnetic noise, meet the requirement of EMI regulations limitation, avoid influencing periphery Electronic equipment and power supply grid, still, its concatenation can lead to many problems：
First, loss is serious：When inhibiting faint uA grade electromagnetic noises, need to bear the load current of electrical equipment simultaneously, So as to cause additional loss and fever, the efficiency and reliability of electrical equipment are reduced；
It is second, bulky：To bear electrical equipment load current, inevitably result in common mode inductance and differential mode inductance volume increases Greatly, the even more than volume of electrical equipment functional circuitry, becomes to put the cart before the horse；
Third, cost increases：Needs for the electromagnetic noise suppression for meeting different frequency range, it usually needs using being total to for different magnetic materials Mould inductance inhibits the electromagnetic noise of different frequency range, necessarily leads to multiple-stage filtering framework in this way, eventually leads to passive electromagnetic interface filter Cost increases, and volume further increases, while also causes more to be lost and generate heat；
Fourth, near-field coupling：Since passive device volume is big and electromagnetic noise near field coupling occur in the influence of stray parameter, high band Conjunction and resonance, cause filter effect that expected design is not achieved.
Fig. 5 is the conceptual schematic view of existing active EMI filter, as shown in figure 5, to solve above-mentioned traditional passive EMI The defects of wave filter, the concept structure of active EMI filter are suggested, and active EMI filter can acquire the production of rear class electrical equipment Raw electromagnetic noise current or voltage signal, closed loop feedback is realized after amplifying by gain, to achieve the purpose that noise suppressed.
Through retrieving domestic and international patent database, active EMI filter has two related patents.Two patents all use On conventional common mode inductance plus the 3rd couples winding to extract the common mode electromagnetic noise for flowing through common mode inductance, is put by gain After big processing, the common mode circuit formed including the earth or shell is injected by capacitance, to realize the inhibition of common-mode noise.
But since 3 windings of common mode inductance cannot reach complete coupling, always can there are 3% ~ 5% or so leakage inductance, So as to while common mode electromagnetic noise is coupled to, be also coupled to the differential mode electromagnetic noise of part, be mingled in common mode electromagnetic noise In be amplified processing together, be injected into common mode circuit, finally result in the new common mode electricity caused by being mixed into differential mode electromagnetic noise Magnetic noise, so as to which the inhibition of expected common mode electromagnetic noise be not achieved.
In a wherein patent, active differential mode EMI filter is also in addition proposed, wherein being serially connected in dc bus by sampling On inductive drop signal obtain differential mode electromagnetic noise, then after enhanced processing, control mosfet transistor impedance come it is real Now inhibit the purpose of differential mode noise.However, differential mode electromagnetic noise can be included on the dc bus of power supply, also simultaneously comprising common mode Therefore electromagnetic noise, not only includes differential mode electromagnetic noise, also including common mode electromagnetic noise in the electromagnetic noise obtained from inductance. Mix the differential mode electromagnetic noise of common mode electromagnetic noise so together after enhanced processing, the impedance for passing through mosfet transistor becomes Change, be injected into differential mode circuit, finally result in and cause new differential mode electromagnetic noise due to being mixed into common mode electromagnetic noise, finally up to not To expected differential mode noise inhibition.
Fig. 6 is the test setting figure of existing standard Conduction Interference, as shown in fig. 6, the Conduction Interference according to CISP16-1-2 Standard testing setting figure, wherein the linear impedance matching network using standard（Abbreviation LISN）Be serially connected with power supply grid system and The Conduction Interference noise of equipment under test is extracted between electrical equipment.In Conduction Interference test, the electromagnetism that receiver detects is made an uproar Sound is by linear impedance matching network（Abbreviation LISN）Coupling extraction.It can be flowed through in the input cable of power supply grid system Differential-mode current IdmWith common mode current Icm.Differential-mode current is being direction in inputting cable on the contrary, through the difference in tested electrical equipment Back to power supply grid system after mould electromagnetic noise source, and common mode current is co-flow in cable is inputted, by what is be tested Common mode electromagnetic noise source returns to LISN through the earth in electrical equipment, then is received machine and couples extraction through LISN.
Although the schematic diagram of existing active EMI filter shown in fig. 5 is not only suitable for suppression common mode electromagnetic noise, it is also suitable In differential mode electromagnetic noise suppression, but common mode electromagnetic noise is different with the propagation path of differential mode electromagnetic noise, differential mode electromagnetic noise Only can be by differential mode loop propagation, and common mode electromagnetic noise can only be propagated by common-mode path, however, can on input cable and It generates and overlaps inside electrical equipment, and the other half propagation path of common mode electromagnetic noise is through too greatly being surveyed by electromagnetic interference The receiver of examination detects that therefore, it is to realize that common-mode noise poor in electrical equipment, which is carried out completely isolated extraction and is injected separately into, The inhibition of poor common mode electromagnetic noise is very crucial.
Fig. 6 is the test setting figure of existing standard Conduction Interference, as shown in fig. 6, the electromagnetic noise flowed on input cable 1 Electric current I inputs 1 can include 1/2 common mode electromagnetic noise current ICMWith differential mode electromagnetic noise current IDM, and returned at another The electromagnetic noise current I inputs 2 flowed on input cable 2 can include common mode electromagnetic noise current I in the same directionCMWith reversed differential mode Electromagnetic noise current IDM.Input 1/2 common mode electromagnetic noise current I in the same direction in cable 1 and 2CMIt can be by tested electrical equipment Common mode electromagnetic noise source 101 through connecing the metallic plate of the earth in conduction test back in receiver, so as to common mode electromagnetic noise Electric current ICMMachine examination is received to measure.Differential mode electromagnetic noise source 100 in tested electrical equipment generates differential mode electromagnetic electric current and is inputting Reverse flow in cable 1 and 2 after LISN is coupled, is received machine examination and measures.
Invention content
The purpose of the present invention is to provide a kind of common mode electromagnetic noise injection network, the common mode electromagnetic noise injection network energy Common mode electromagnetic noise after treatment is enough made to pass through common mode circuit back to the common-mode noise source in electrical equipment, is set using electricity Standby electromagnetic noise can not enter in electric power system even on a small quantity.
The present invention provides a kind of common mode electromagnetic noise injection network, the common mode electromagnetic noise injection network include injection member and Common mode circuit；Wherein,
The injection member at least has common mode electromagnetic noise component inputs and circuit end；
The common mode electromagnetic noise component inputs are used to input common mode electromagnetic noise component；The circuit end is returned with the common mode Any point connection in road, for injecting the common mode electromagnetic noise component；
The injection member has and only includes capacitance group or have and only include winding inductance.
Wherein, capacitance group includes one or more capacitances.
Further, the injection member includes three capacitances, respectively the first capacitance, the second capacitance and third capacitance；
The first end of first capacitance is the common mode electromagnetic noise component inputs, second capacitance and third electricity Two first ends held are the circuit end；
Three second ends of first capacitance, second capacitance and the third capacitance connect simultaneously.
Further, the injection member is ground capacity, and the first end of the ground capacity is the common mode electromagnetic noise Component inputs, the second end of the ground capacity is the circuit end.
Further, the common mode circuit is the circuit that common mode current flows through, and is set including electrical equipment input circuit, electricity consumption Standby housing or the earth.
Further, the input cable being connected between electric power system and electrical equipment, the input cable packet are further included Include the first input cable being connected in parallel between electric power system and electrical equipment and the second input cable；
The injection member is three winding common mode inductance, and the three winding of the three winding common mode inductance is respectively primary side winding, secondary Winding NS1With vice-side winding NS2, the vice-side winding NS1With vice-side winding NS2Opposite and polarity is identical；Wherein,
One end of the primary side winding is the common mode electromagnetic noise component inputs, and another termination of the primary side winding refers to Ground；
The vice-side winding NS1With the vice-side winding NS2First end and the described first input cable and second input line Cable connects one to one, the vice-side winding NS1With the vice-side winding NS2Second end be the circuit end.
Further, setting electrical equipment includes firewire, zero curve, rectifier bridge and capacitance；Wherein,
The firewire and the zero curve are connect with the rectifier bridge, and the capacitance connection is in the anode and cathode of the rectifier bridge Between；
The input circuit of the circuit end and electrical equipment connects；
Connection of the corresponding decanting point in the circuit end between the firewire and the anode of the capacitance and the rectifier bridge On line, for injecting simultaneously.
Further, setting electrical equipment includes input anode line, input cathode line and capacitance；
The first end of the capacitance is connected on the input anode line, and the second end of the capacitance is connected to the input and bears On the line of pole；
The corresponding decanting point in the circuit end of the injection member is located at the input anode line and the input cathode line On, for injecting simultaneously.
Common mode electromagnetic noise injection network provided by the invention includes injection member and common mode circuit；Wherein, injection member have and Only there is common mode electromagnetic noise component inputs and circuit end；Common mode electromagnetic noise component inputs are made an uproar for inputting by electromagnetism Sound switching network carries out the common mode electromagnetic noise component of gain amplification and phase closed-loop process；In circuit end and the common mode circuit Any point connection, for injecting common mode electromagnetic noise component；Injection member has and only includes capacitance or have and only include winding Inductance.
In active Electromagnetic interference filter, the common mode electromagnetic noise and differential mode electromagnetic noise extracted pass through electromagnetic noise Switching network carries out gain and closed loop feedback processing, and differential mode electromagnetic noise and common mode electromagnetic noise after treatment is by differential mode Electromagnetic noise injection network and common-mode noise injection network are returned to by differential mode circuit and common mode circuit in electrical equipment respectively Differential mode noise source and common-mode noise source, in this way, the electromagnetic noise of electrical equipment can on a small quantity even enter electric power system in, So that surrounding enviroment and power supply grid are not influenced by the electromagnetic noise of electrical equipment, while can also electrical equipment be allowed to meet EMI The requirement of regulation limit value.
Another object of the present invention, which also resides in, provides a kind of active Electromagnetic interference filter, the active Electromagnetic interference filter Including common mode electromagnetic noise injection network as described above.
Further, electromagnetic noise switching network is further included；
The electromagnetic noise switching network includes the first resistance-capacitance network, the second resistance-capacitance network and operational amplifier；Wherein,
The first end of first resistance-capacitance network is used to receive the common-mode noise component that common mode electromagnetic noise extraction network is exported, The second end of first resistance-capacitance network is connect with the negative input of the operational amplifier；
Second resistance-capacitance network is connected between the electrode input end and negative input of the operational amplifier；
The common mode electromagnetic noise point of the output terminal of the operational amplifier and the injection member of the common mode electromagnetic noise injection network Input terminal connection is measured, the common mode electromagnetic noise component inputs are for common mode of the input from the electromagnetic noise switching network Electromagnetic noise component.
Further, the common mode electromagnetic noise extraction network is further included, for extracting the common mode electromagnetism inputted in cable Noise；
The common mode electromagnetic noise extraction network is connect with the electromagnetic noise switching network.
The advantageous effect of active Electromagnetic interference filter provided by the invention compared with the prior art, is same as offer of the present invention Common mode electromagnetic noise injection network advantageous effect compared with the prior art, details are not described herein again.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the connection diagram of electrical equipment and electric power system；
Fig. 2 is the application schematic diagram of existing passive electromagnetic interface filter；
Fig. 3 is the schematic diagram of existing common mode EMI filters；
Fig. 4 is the schematic diagram of existing differential mode EMI filter；
Fig. 5 is the conceptual schematic view of existing active EMI filter；
Fig. 6 is the test setting figure of existing standard Conduction Interference；
Fig. 7 is the schematic diagram of active EMI filter technology provided in an embodiment of the present invention；
Fig. 8 is the first schematic diagram that electromagnetic noise provided in an embodiment of the present invention handles network；
Fig. 9 is the second schematic diagram that electromagnetic noise provided in an embodiment of the present invention handles network；
Figure 10 is the first schematic diagram of electromagnetic noise sampling network provided in an embodiment of the present invention；
Figure 11 is the second schematic diagram of electromagnetic noise sampling network provided in an embodiment of the present invention；
Figure 12 is the first schematic diagram that electromagnetic noise provided in an embodiment of the present invention extracts network；
Figure 13 is the second schematic diagram that electromagnetic noise provided in an embodiment of the present invention extracts network；
Figure 14 is the schematic diagram of the differential mode electromagnetic noise injection network provided in an embodiment of the present invention based on semiconductor transistor；
Figure 15 is the schematic diagram of the differential mode electromagnetic noise injection network provided in an embodiment of the present invention based on double winding differential mode inductance；
Figure 16 is the schematic diagram of the differential mode electromagnetic noise injection network provided in an embodiment of the present invention based on 3 winding differential mode inductances；
Figure 17 is the schematic diagram of the common mode electromagnetic noise injection network provided in an embodiment of the present invention based on capacitance；
Figure 18 is the schematic diagram of the common mode electromagnetic noise injection network provided in an embodiment of the present invention based on ground capacity；
Figure 19 is the schematic diagram of the common mode electromagnetic noise injection network provided in an embodiment of the present invention based on common mode inductance；
Figure 20 is the power supply adaptor simplified electrical circuit diagram of one provided in an embodiment of the present invention exchange input；
Figure 21 is the Switching Power Supply simplified electrical circuit diagram of a direct current provided in an embodiment of the present invention input；
Figure 22 is the power supply adaptor simplified electrical circuit diagram of one provided in an embodiment of the present invention exchange input；
Figure 23 is the Switching Power Supply simplified electrical circuit diagram of a direct current provided in an embodiment of the present invention input；
Figure 24 is the schematic diagram of electromagnetic noise switching network provided in an embodiment of the present invention；
Figure 25 is the schematic diagram of active Electromagnetic interference filter that the embodiment of the present invention one provides；
Figure 26 is the schematic diagram of active Electromagnetic interference filter provided by Embodiment 2 of the present invention；
Figure 27 is the schematic diagram of active Electromagnetic interference filter that the embodiment of the present invention three provides；
Figure 28 is the schematic diagram of active Electromagnetic interference filter that the embodiment of the present invention four provides；
Figure 29 is the schematic diagram of active Electromagnetic interference filter that the embodiment of the present invention five provides.
Reference numeral：
1- first inputs cable；2- second inputs cable；01- common mode electromagnetic noise extractors；02- differential modes electromagnetic noise is extracted Device；The first samplers of 001-；The second samplers of 002-；21- electromagnetic noises handle network；22- electromagnetic noise switching networks；23- Differential mode electromagnetic noise injection network；25- common mode electromagnetic noise injection networks；31- electromagnetic noise sampling networks；32- electromagnetic noises Extract network；The first operational amplifiers of 33-；34- second operational amplifiers；The first resistance-capacitance networks of 35-；The second resistance-capacitance networks of 36-； 100- first inputs the electromagnetic noise of cable；101- second inputs the electromagnetic noise of cable；108- common mode electromagnetic noise output terminals； 109- differential mode electromagnetic noise output terminals.
Specific embodiment
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation Example is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill Personnel's all other embodiments obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " " center ", " on ", " under ", "left", "right", " vertical ", The orientation or position relationship of the instructions such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to Convenient for the description present invention and simplify description rather than instruction or imply signified device or element must have specific orientation, With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ", " third " is only used for description purpose, and it is not intended that instruction or hint relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition Concrete meaning in invention.
Fig. 7 is the schematic diagram of active EMI filter technology provided in an embodiment of the present invention, with reference to shown in Fig. 7, for traditional nothing The shortcomings that source electromagnetic interface filter and existing active EMI filter, the embodiment of the present invention propose that a kind of poor common mode electromagnetic noise presses down respectively The active EMI filter technology of system, it is practical that the technology is implemented with active Electromagnetic interference filter, the active Electromagnetic interference filter by Electromagnetic noise processing network 21, electromagnetic noise switching network 22, differential mode electromagnetic noise injection network 23 and common mode electromagnetic noise note Enter network 25 to form.
The active EMI filter technology that the embodiment of the present invention proposes handles network 21 from electrical equipment by electromagnetic noise Input cable in extract differential mode electromagnetic noise and common mode electromagnetic noise respectively after, be separately input to electromagnetic noise switching network 22 into Row gain and closed loop feedback processing, differential mode electromagnetic noise and common mode electromagnetic noise after treatment are noted by differential mode electromagnetic noise Enter network 23 and common mode electromagnetic noise injection network 25 by electromagnetic noise after processing, pass through differential mode circuit respectively and common mode is returned Road returns to differential mode noise source and common-mode noise source in electrical equipment.It is recycled inside electromagnetic noise in this way, can realize, allows use The electromagnetic noise of electric equipment does not enter in electric power system even on a small quantity so that surrounding enviroment and power supply grid be not by electrical equipment The influence of electromagnetic noise, while electrical equipment can also be allowed to meet the requirements of EMI regulation limit values.
The active EMI filter technology that the embodiment of the present invention proposes handles network 21, differential mode electromagnetic noise note in electromagnetic noise Entering network 23 and common mode electromagnetic noise injection network 25 has following key innovations：
1. the extraction network of independent differential mode electromagnetic noise is used in the electromagnetic noise processing network 21 that the embodiment of the present invention proposes, It is output to rear class electromagnetic noise switching network 22 and carries out gain and closed loop feedback processing.The embodiment of the present invention proposes diversified forms The electromagnetic noise of differential mode extracts network 32 to coordinate the electromagnetic noise switching network 22 of rear class, differential mode electromagnetic noise injection network 23 With common mode electromagnetic noise injection network 25.
The electromagnetic noise processing network for the differential mode that the embodiment of the present invention proposes can be realized to be more than with common mode electromagnetic noise The isolation of 60dB is equivalent to the common mode electromagnetic noise only less than 0.1% in the differential mode electromagnetic noise of extraction so that electromagnetism is made an uproar Sound inhibition can reach expected inhibition.
2. the extraction of independent common mode electromagnetic noise is used in the electromagnetic noise processing network 21 that the embodiment of the present invention proposes Network is output to rear class electromagnetic noise switching network 22 and carries out gain and closed loop feedback processing.
The embodiment of the present invention proposes the electromagnetic noise extraction network 32 of the common mode of diversified forms, and the electromagnetism to coordinate rear class is made an uproar Sound switching network 22, common mode electromagnetic noise injection network 23 and common mode electromagnetic noise injection network 25.The embodiment of the present invention proposes Common mode electromagnetic noise extraction network 32 can realize with differential mode electromagnetic noise be more than 60dB isolation, be equivalent to extraction In common mode electromagnetic noise only less than 0.1% differential mode electromagnetic noise so that electromagnetic noise suppression effect can reach expected and inhibit effect Fruit.
3. the active EMI filter that the embodiment of the present invention proposes, will using independent differential mode electromagnetic noise injection network 23 Differential mode electromagnetic noise that treated is injected into the differential mode circuit of electrical equipment, is pressed down by changing the differential-mode impedance in differential mode circuit Differential mode electromagnetic noise processed.The embodiment of the present invention proposes the differential mode electromagnetic noise injection network 23 of diversified forms, after prime is handled Differential mode electromagnetic noise be injected into the differential mode circuit of electrical equipment, by changing the differential-mode impedance in differential mode circuit, to realize electricity The inhibiting effect of magnetic noise.
4. the active EMI filter that the embodiment of the present invention proposes is divided using independent common mode electromagnetic noise injection network 25 Not by the common mode circuit of treated common mode electromagnetic noise is injected into electrical equipment, the common mode then returned in electrical equipment is made an uproar Sound source forms internal recycle.The embodiment of the present invention proposes the common mode electromagnetic noise injection network 25 of diversified forms, and prime is handled Common mode electromagnetic noise afterwards is injected into the common mode circuit of electrical equipment, then returnes to the common-mode noise source in electrical equipment, shape It is recycled into inside, realizes the inhibiting effect of electromagnetic noise.
5. the active EMI filter that the embodiment of the present invention proposes has the flexibility of differential mode electromagnetic noise decanting point, can be with Differential mode electromagnetic noise is being injected from input cable to any point in the differential mode circuit in rear class electrical equipment, by changing differential mode Differential-mode impedance in circuit realizes the inhibiting effect of electromagnetic noise.
6. the active EMI filter that the embodiment of the present invention proposes has the flexibility of common mode electromagnetic noise decanting point, can be with Injection common mode electromagnetic noise is being carried out from input cable to any point in the common mode circuit in rear class electrical equipment, is being then back to Common mode electromagnetic noise source into electrical equipment forms the internal inhibiting effect for recycling, realizing electromagnetic noise.
The electromagnetic noise of diversified forms processing network 21, the differential mode electromagnetic noise note proposed below for the embodiment of the present invention Enter network 23, common mode electromagnetic noise injection network 25 and flexible electromagnetic noise decanting point to be illustrated one by one.
A variety of realization methods of network are handled for electromagnetic noise below.
The electromagnetic noise processing network 21 that the active EMI filter that the embodiment of the present invention proposes uses is carried including electromagnetic noise Network 32 is taken, electromagnetic noise extraction network 32 there are following 2 kinds of main realization methods：Directly extraction network and indirectly extraction net Network or corresponding referred to as single-stage extraction network and two-stage extraction network, make an uproar for extracting differential mode electromagnetic noise and common mode electromagnetism Sound.
Wherein, electromagnetic noise extraction network 32 includes common mode electromagnetic noise extractor 01 and differential mode electromagnetic noise extractor 02；Wherein, common mode electromagnetic noise extractor 01 is used to extract and export the common mode electromagnetic noise of the input cable；Differential mode electromagnetism Noise extractor 02 is used to extract and export the differential mode electromagnetic noise of the input cable.
In single-stage extraction network, common mode electromagnetic noise extractor 01 is used to directly extract and export the common mode electricity of input cable Magnetic noise；Differential mode electromagnetic noise extractor 02 is used to directly extract and export the differential mode electromagnetic noise of input cable.
In two-stage extraction network, common mode electromagnetic noise extractor 01 is used to extract and export indirectly the common mode electricity of input cable Magnetic noise；Differential mode electromagnetic noise extractor 02 is used to extract and export indirectly the differential mode electromagnetic noise of input cable.
Fig. 8 is the first schematic diagram that electromagnetic noise provided in an embodiment of the present invention handles network, with reference to shown in Fig. 8, single-stage It extracts in network, common mode electromagnetic noise extractor 01 and differential mode electromagnetic noise extractor 02 are ring type current transformer, directly Differential mode electromagnetic noise and common mode electromagnetic noise are extracted, is output to rear class electromagnetic noise switching network 22, gain is carried out and closed loop is anti- Feedback is handled.
Single-stage extraction network is made of 2 current transformers, wherein, the first input cable 1 sequentially passes through common mode electromagnetism and makes an uproar The inner ring of sound extractor 01 and differential mode electromagnetic noise extractor 02；Second input cable 2 passes through common mode electromagnetic noise extractor 01 After inner ring, along differential mode electromagnetic noise extractor 02 thickness direction around the ring body one of differential mode electromagnetic noise extractor 02 enclose after around Go out.
In other words, common mode electromagnetic noise extractor 01 is inserted in the first input cable 1 and the second input cable 2 simultaneously, according to Current loop law, the output of common mode electromagnetic noise extractor 01 are equal to the electric current summation for being inserted in 2 input cables, as IInput 1+IInput 2=（ICM/2+IDM）+（ICM/2-IDM）=ICM, therefore, the output of common mode electromagnetic noise extractor 01 is made an uproar for common mode electromagnetism Acoustoelectric current ICM。
Similarly, the direction for inputting cable is inserted according to differential mode electromagnetic noise extractor 02 and the side of electric current is flowed through in cable To, it can be deduced that the output of differential mode electromagnetic noise extractor 02 is differential mode electromagnetic noise current:（ICM/2+IDM）-（ICM/2-IDM）= IDM。
Wherein, the realization method of two-level network extraction differential mode electromagnetic noise and common mode electromagnetic noise is as follows：
Fig. 9 is the second schematic diagram that electromagnetic noise provided in an embodiment of the present invention handles network, with reference to shown in Fig. 9, two-stage extraction The realization method of network is made of two parts network：Electromagnetic noise sampling network 31 and electromagnetic noise extraction network 32.
Electromagnetic noise sampling network 31 is arranged between input cable and electromagnetic noise extraction network 32, for input line The poor common mode electromagnetic noise of cable, which is sampled and exports the poor common mode electromagnetic noise sampled to electromagnetic noise, extracts network 32； Common mode electromagnetic noise extractor 01 is used to extract and export in the poor common mode electromagnetic noise that electromagnetic noise sampling network 31 is sampled Common mode electromagnetic noise；Differential mode electromagnetic noise extractor 02 is used to extracting and exporting the difference that electromagnetic noise sampling network 31 is sampled Differential mode electromagnetic noise in common mode electromagnetic noise.
The overall electromagnetic noise on every input cable that electromagnetic noise sampling network 31 extracts, is then input to poor common mode Electromagnetic noise extracts network 32, after common mode electromagnetic noise and differential mode electromagnetic noise are individually insulated, then is output to rear class electricity Magnetic noise switching network 22 carries out gain and closed loop feedback processing.Wherein, the overall electromagnetic noise on every input cable includes Differential mode electromagnetic noise and common mode electromagnetic noise.
Wherein, the realization method of electromagnetic noise sampling network 31 is as follows：
Electromagnetic noise sampling network 31 can be carried out sampling the overall electromagnetic noise in every input cable with various ways.Electromagnetism The various ways realization method of noise samples network 31 can need to extract with rear differential common mode electromagnetic noise according to practical application A variety of realization methods at network 32 carry out arbitrary combination, to obtain purer differential mode electromagnetic noise and common mode electromagnetic noise, Input as rear class electromagnetic noise switching network 22.
Electromagnetic noise sampling network 31 includes the first sampler 001 and the second sampler 002, and there are two types of realization methods for tool.
Figure 10 is the first schematic diagram of electromagnetic noise sampling network provided in an embodiment of the present invention, with reference to shown in Figure 10, the In one mode, the first sampler 001 and the second sampler 002 are current transformer；Wherein, the first sampler 001 is arranged on On first input cable 1, the first sampler 001 connects with common mode electromagnetic noise extractor 01 or differential mode electromagnetic noise extractor 02 It connects；Second sampler 002 is arranged on the second input cable 2, the second sampler 002 and common mode electromagnetic noise extractor 01 or poor Mould electromagnetic noise extractor 02.
Every cable can add in current transformer and carry out using the electromagnetic noise current in cable, and the electromagnetism being achieved in that is made an uproar Sound can include common mode electromagnetic noise and differential mode electromagnetic noise in cable.
Figure 11 is the second schematic diagram of electromagnetic noise sampling network provided in an embodiment of the present invention, with reference to shown in Figure 11, the In two modes, electromagnetic noise sampling network includes inductance L1, and inductance L1 includes two primary side winding NP1And NP2It is adopted with two secondary Sample winding NS1And NS2；Wherein, one of primary side winding NP1It is serially connected between the first input cable 1 and electrical equipment, another Primary side winding NP2It is serially connected between the second input cable 2 and electrical equipment；Two secondary sampler winding NS1And NS2With two primary sides Winding NP1And NP2Correspond coupling, two secondary sampler winding NS1And NS2Two second ends be used to export corresponding input The poor common mode electromagnetic noise of cable.
More specifically, electromagnetic noise sampling network 31 adds coupling winding to obtain on every input cable using inductance Electromagnetic noise, wherein inductance L1 are made of 4 windings, are primary side winding N respectivelyP1And NP2, secondary sampler winding NS1And NS2, it is former Side winding NP1With secondary sampler winding NS1Tightly coupled winding mode is used to reach the high degree of coupling；Primary side winding NP2With secondary Sample winding NS2Tightly coupled winding mode is used to reach the high degree of coupling.
Primary side winding NP1It is serially connected between the first input cable 1 and electrical equipment input, primary side winding NP2It is serially connected with second It inputs between cable 2 and electrical equipment input.Secondary sampler winding NS1And NS2One end ground connection after, other end output coupling to pair The electromagnetic noise of cable should be inputted.The electromagnetic noise being achieved in that can make an uproar including the common mode electromagnetic noise in cable and differential mode electromagnetism Sound.
Wherein, the realization method at poor common mode electromagnetic noise extraction network 32 is as follows：
Poor common mode electromagnetic noise extraction network 32 can be isolated with diversified forms, be made an uproar with the differential mode electromagnetism for obtaining purer Sound and common mode electromagnetic noise, the input as rear class electromagnetic noise switching network 22.Poor common mode electromagnetic noise extraction network 32 A variety of realization methods can be appointed with a variety of realization methods of prime electromagnetic noise sampling network 31 according to practical application Meaning combination, to obtain purer differential mode electromagnetic noise and common mode electromagnetic noise, as rear class electromagnetic noise switching network Input 22.
There are two types of the realization methods at poor common mode electromagnetic noise extraction network 32：Winding induced voltage offsets mode and operation is put Big device algebraical sum mode.
Figure 12 is the first schematic diagram that electromagnetic noise provided in an embodiment of the present invention extracts network 32, with reference to shown in Figure 12, Poor common mode electromagnetic noise extraction network 32 can be realized by way of the winding induced voltage counteracting of magnetic device, to obtain Purer differential mode electromagnetic noise and common mode electromagnetic noise, wherein, common mode electromagnetic noise extractor 01 and differential mode electromagnetic noise Extractor 02 is double winding inductance, respectively L1 and L2；Wherein, the polarity of two windings of common mode electromagnetic noise extractor 01 On the contrary, the first end of two windings of common mode electromagnetic noise extractor 01 be respectively used to receive first input cable 1 and second it is defeated Enter the poor common mode electromagnetic noise of cable 2, the second end of two windings of common mode electromagnetic noise extractor 01 is used to output common mode Electromagnetic noise；The polarity of two windings of differential mode electromagnetic noise extractor 02 is identical, two of differential mode electromagnetic noise extractor 02 The first end of winding is respectively used to receive the poor common mode electromagnetic noise that the first input cable 1 and second inputs cable 2, differential mode electromagnetism The second end of two windings of noise extractor 02 is used to output differential mode electromagnetic noise.
First, two opposite one end of winding polarity of double winding inductance L1 are respectively connected to the sampling of prime electromagnetic noise The electromagnetic noise 100 and second of first input cable of the output of network 31 inputs the electromagnetic noise 101 of cable；Double winding inductance 2 winding other ends of L1 export after being connected as common mode electromagnetic noise.
Since the common mode current that the first input cable 1 and second is inputted in cable 2 is in the same direction, and first inputs cable 1 It is reversely opposite with the differential-mode current in the second input cable 2, therefore, according to magnetic theory, the first input cable 1 and second The induced voltage that the common mode current in the same direction of input cable 2 generates in double winding inductance L1 in the winding of magnetic core is cancelled out each other, and is changed Yan Zhi does not have inhibiting effect to common mode current, otherwise has inhibiting effect to differential-mode current.Therefore, by double winding inductance L1 this The connection mode of sample can isolate out differential mode electromagnetic noise, and obtain pure common mode electromagnetic noise.
According to the principle of above-mentioned isolation differential mode electromagnetic noise, common mode electromagnetic noise can also be isolated.First, double winding electricity Two identical one end of winding polarity of sense L2 are respectively connected to the first input of the output of prime electromagnetic noise sampling network 31 The electromagnetic noise 100 and second of cable inputs the electromagnetic noise 101 of cable；2 winding other end phases of double winding inductance L2 It is exported after even as differential mode electromagnetic noise.
The differential-mode current that first input cable 1 and second is inputted in cable 2 is reversely opposite, and first inputs cable 1 It is in the same direction with the common mode current in the second input cable 2.Therefore, according to magnetic theory, the first input cable 1 and second inputs The induced voltage that the differential-mode current in the same direction of cable 2 generates in double winding inductance L2 in the winding of magnetic core is cancelled out each other, in other words, There is no inhibiting effect to differential-mode current, otherwise have inhibiting effect to common mode current.Therefore, by connecting as double winding inductance L2 The mode of connecing can isolate out common mode electromagnetic noise, and obtain pure differential mode electromagnetic noise.
Figure 13 is the second schematic diagram that electromagnetic noise provided in an embodiment of the present invention extracts network 32, with reference to shown in Figure 13, Poor common mode electromagnetic noise extraction network 32 can also be realized with the mode of operational amplifier logarithm sum, purer to obtain Differential mode electromagnetic noise and common mode electromagnetic noise.
The output of common mode electromagnetic noise is by the first operational amplifier 33, resistance R1, resistance R2, resistance R3Come with resistance R4 real The purpose of differential mode electromagnetic noise is now isolated.The negative input of first operational amplifier 33 and resistance R1, R2 and R3It is connected, first The electrode input end of operational amplifier 33 is connected with resistance R4, is connected to the ground after resistance R4；First operational amplifier 33 it is defeated Outlet and resistance R3It is connected, while as common mode electromagnetic noise output terminal 108, the other end of resistance R1 and the first input cable 1 Electromagnetic noise 100 be connected；The other end of resistance R2 is connected with the electromagnetic noise 101 of the second input cable 2.According to operation amplifier The connection mode of device and resistor network can realize addition of algebra, by the electromagnetic noise current I of the first input cable 1Input 1With it is defeated Enter the electromagnetic noise current I of cable 2Input 2Middle progress addition of algebra IInput 1+ IInput 2, common mode electromagnetic noise I is so obtained in this wayCM, Isolate out differential mode electromagnetic noise IDM。
According to the method for above-mentioned acquisition common mode electromagnetic noise, can realize subtraction to obtain differential mode electromagnetic noise, with after From falling common mode electromagnetic noise.
The output of differential mode electromagnetic noise is by second operational amplifier 34, resistance R5, resistance R6, resistance R7 and resistance R8 Lai real The purpose of common mode electromagnetic noise is now isolated.The negative input of second operational amplifier 34 is connected with resistance R5 and R7；Second fortune The electrode input end for calculating amplifier 34 is connected with resistance R6 and resistance R8, is connected to the ground after resistance R8；Second operational amplifier 34 output terminal is connected with resistance R7, while as the output terminal of differential mode electromagnetic noise；The other end of resistance R5 and the first input The electromagnetic noise 100 of cable is connected；The other end of resistance R6 is connected with the electromagnetic noise 101 of the second input cable.
Algebraically subtraction can be realized according to the connection mode of operational amplifier and resistor network, by the first input cable 1 Electromagnetic noise current IInputWith the electromagnetic noise current I of the second input cable 2Input 2Middle progress addition of algebra IInput 1- IInput 2, so Differential mode electromagnetic noise I can be obtainedDM, isolate out common mode electromagnetic noise ICM。
" algebraical sum of operational amplifier " realization method of above-mentioned elaboration be will input common mode electromagnetic noise in cable and Differential mode electromagnetic noise realizes one of realization method of addition of algebra and algebraically subtraction.
Wherein, involved+Vcc and-Vcc represents positive supply and negative supply respectively in the present embodiment attached drawing.
It is a variety of realization methods of differential mode electromagnetic noise injection network below.
Differential mode electromagnetic noise injection network 23 can be realized with various ways：The shape of semiconductor transistor and differential mode inductance Formula.The differential mode electromagnetic noise injection network includes injection member, wherein, injection member at least has the first injection end, the second injection end With differential mode electromagnetic noise component inputs；In the present embodiment, the first injection end preferably inputs cable connecting pin, for input Cable connects, and the second injection end is preferably electrical equipment connecting pin, for connecting electrical equipment, certainly, above-mentioned first injection end It may be selected to connect with the decanting point in the differential mode circuit of other forms with the second injection end, for example rectifier bridge is electric later in electrical equipment Circuit in road, differential mode electromagnetic noise component inputs divide for inputting the differential mode electromagnetic noise from electromagnetic noise switching network Amount, injection member are used to inhibit the noise of the differential mode electromagnetic noise component.
Figure 14 is the signal of the differential mode electromagnetic noise injection network provided in an embodiment of the present invention based on semiconductor transistor Figure, with reference to shown in Figure 14, the differential mode electromagnetic noise injection network based on semiconductor transistor, wherein, semiconductor transistor is field Effect transistor Q1, drain electrode are connected to the first input cable 1, and source electrode is connected to electrical equipment, and gate pole is connected to prime The differential mode electromagnetic noise output terminal 109 of electromagnetic noise switching network 22.
The active EMI filter that the embodiment of the present invention proposes can change to adjust the using the gate voltage of transistor Q1 Differential-mode impedance on one input cable 1, so as to fulfill the purpose of differential mode electromagnetic noise is inhibited.
It is in same differential mode circuit since the first input cable 1 and second inputs cable 2, transistor Q1 can To be placed on any position in differential mode circuit, the purpose for inhibiting differential mode electromagnetic noise, such as the second input cable 2 can act as On or in rear class electrical equipment in differential mode circuit.
Figure 15 is showing for the differential mode electromagnetic noise injection network provided in an embodiment of the present invention based on double winding differential mode inductance It is intended to, with reference to shown in Figure 15, the differential mode electromagnetic noise injection network based on double winding differential mode inductance, wherein, double winding differential mode electricity Feeling L3 has 2 windings：Primary side winding NPWith vice-side winding NS；The primary side winding N of double winding differential mode inductance L3PBefore the connection of one end The differential mode electromagnetic noise output terminal 109 of grade electromagnetic noise switching network 22, the other end does grounding；Double winding differential mode inductance L3 Vice-side winding NSOne termination first input cable 1, it is another termination rear class electrical equipment.
The active EMI filter that the embodiment of the present invention proposes can utilize the primary side winding N of double winding inductance L3PBy prime The differential-mode component of electromagnetic noise switching network 22 is coupled to the vice-side winding N of double winding inductance L3SIn the differential mode circuit at place, come Change the differential-mode impedance in differential mode circuit, so as to fulfill the purpose of differential mode noise is inhibited.
Figure 16 is the signal of the differential mode electromagnetic noise injection network provided in an embodiment of the present invention based on 3 winding differential mode inductances Figure, with reference to shown in Figure 16, the differential mode electromagnetic noise injection network based on 3 winding differential mode inductances, wherein, 3 winding differential mode inductance L4 With 3 windings：Primary side winding NP1, vice-side winding NS1With vice-side winding NS2；The primary side winding N of 3 winding differential mode inductance L4P1One The differential mode electromagnetic noise output terminal 109 of end connection prime electromagnetic noise switching network 22, the other end does grounding；3 windings are poor The vice-side winding N of mould inductance L4S1One termination first input cable 1, it is another termination rear class electrical equipment；3 winding differential mode inductances The vice-side winding N of L4S2One termination second input cable 2, it is another termination rear class electrical equipment.
The active EMI filter that the embodiment of the present invention proposes can utilize the primary side winding N of 3 winding differential mode inductance L4P1It will The differential mode electromagnetic noise output terminal 109 of prime electromagnetic noise switching network 22 is coupled to the vice-side winding of 3 winding differential mode inductance L4 NS1With vice-side winding NS2In the differential mode circuit at place, to change the differential-mode impedance in differential mode circuit, so as to fulfill differential mode noise is inhibited Purpose.
It is the realization method of common-mode noise injection network below.
Common-mode noise injection network can also be realized with various ways：Common-mode noise injection network based on capacitance is based on The common-mode noise injection network of ground capacity and the common-mode noise injection network based on common mode inductance.
The common mode electromagnetic noise injection network includes injection member, wherein, injection member at least has common mode electromagnetic noise component Input terminal and circuit end, common mode electromagnetic noise component inputs are made an uproar for inputting the common mode electromagnetism from electromagnetic noise switching network Sound component, circuit end is preferably connect with electrical equipment housing, the input circuit of electrical equipment connects or ground connection, certainly, circuit end The common mode circuit any point that can be flowed through with common mode current is attached, and injects common-mode noise.
Figure 17 is the schematic diagram of the common mode electromagnetic noise injection network provided in an embodiment of the present invention based on capacitance, with reference to figure Shown in 17, the common-mode noise injection network based on capacitance, wherein, capacitance C1, one end of capacitance C2 and C3 is connected to together；Capacitance The other end of C1 with first input cable 1 and rear class electrical equipment be connected, the other end of capacitance C2 with second input cable 2 and after Grade electrical equipment is connected；The other end of capacitance C3 and the common mode electromagnetic noise output terminal 108 of prime electromagnetic noise switching network 22 It is connected.
The active EMI filter that the embodiment of the present invention proposes can be electric by prime by capacitance C3, capacitance C1 and capacitance C2 The common mode electromagnetic noise output terminal 108 of magnetic noise switching network 22 is injected into common mode circuit, after common mode current is allowed to return to Common-mode noise source in grade electrical equipment, plays the purpose of suppression common mode electromagnetic noise, while realizes and make EMI reception machine testings few Amount.Even it cannot detect common-mode noise.
The connection mode of common-mode noise injection network based on capacitance is related to the earth due to not needing to, and can not only fit With the I class electrical equipments with input tape the earth, it is also applied for inputting the II classes electrical equipment without the earth and direct current supply Electrical equipment.
Figure 18 is the schematic diagram of the common mode electromagnetic noise injection network provided in an embodiment of the present invention based on ground capacity, is joined According to shown in Figure 18, one end connection prime electromagnetic noise of the common-mode noise injection network based on ground capacity, wherein capacitance C4 turns The shell of the common mode electromagnetic noise output terminal 108 of switching network 22, another termination the earth or electrical equipment.
The active EMI filter that the embodiment of the present invention proposes can be by capacitance C4 by prime electromagnetic noise switching network 22 Common mode output component be injected into common-mode noise circuit, common mode electromagnetic noise is allowed to return to common-mode noise source as soon as possible, can be a small amount of Common-mode noise is not even detected by EMI receivers.
Figure 19 is the schematic diagram of the common mode electromagnetic noise injection network provided in an embodiment of the present invention based on common mode electromagnetism, is joined According to shown in Figure 19, the common-mode noise injection network based on common mode inductance, common mode inductance L5 has 3 windings：Primary side winding NP1, secondary Winding NS1With vice-side winding NS2.The primary side winding N of common mode inductance L5P1One end connection prime electromagnetic noise switching network 22 Common mode electromagnetic noise output terminal 108, another termination reference ground；The vice-side winding N of common mode inductance L5S1One end is connected to the first input Cable 1, the other end is connected to electrical equipment；The vice-side winding N of common mode inductance L5S2One end be connected to the second input cable 2, separately One end is connected to electrical equipment.
The active EMI filter that the embodiment of the present invention proposes can pass through the primary side winding N of inductance L5P1Prime electromagnetism is made an uproar The common mode output component of sound switching network 22, the vice-side winding N through inductance L5S1And NS2Common-mode noise circuit is injected into, to offset Common mode current in common mode circuit, it is possible to reduce common-mode noise is detected by EMI receivers.
Wherein, the decanting point for the differential mode electromagnetic noise injection network 23 that the embodiment of the present invention proposes can be in differential mode circuit Any position can realize the inhibiting effect of differential mode electromagnetic noise.The differential mode circuit mentioned in the embodiment of the present invention refers to differential mode Electric current IDMThe device inside electrical equipment, circuit and the input cable flowed through.
Figure 20 is the power supply adaptor simplified electrical circuit diagram of one provided in an embodiment of the present invention exchange input, with reference to Figure 20 institutes Show, the circuit of black arrow instruction is differential-mode current IDMThe differential mode circuit flowed through, from firewire L, rectifier bridge BD1, capacitance C1 to zero Line N, while including the line between device.The differential mode electromagnetic noise decanting point that the embodiment of the present invention proposes is in the circuit shown in Figure 20 In 4 points of A, B, C and D can be selected to be injected, wherein A points are that firewire L, B point are rectifier bridge BD1 anodes and capacitance C1 Line, line of the C points for rectifier bridge BD1 cathode and capacitance C1, D points are zero curve N.
It, can be with when the differential mode electromagnetic noise injection network using 3 winding differential mode inductances carries out the injection of differential mode electromagnetic noise Consider 2 points of A/D as 2 points of 2 vice-side winding insertion points of 3 winding differential mode inductances or B/C as 3 winding differential mode inductances 2 vice-side winding insertion points.
Figure 21 is the Switching Power Supply simplified electrical circuit diagram of a direct current provided in an embodiment of the present invention input, with reference to Figure 21 institutes Show, the circuit of black arrow instruction is differential-mode current IDMThe differential mode circuit flowed through.Differential mode circuit from input anode line, capacitance C1 To input cathode line.The differential mode electromagnetic noise decanting point that the embodiment of the present invention proposes can select A points and B points in figure 21 It is injected.A points are the line for inputting anode, and B points are the line for inputting cathode.
It, can be with when the differential mode electromagnetic noise injection network using 3 winding differential mode inductances carries out the injection of differential mode electromagnetic noise Consider 2 points of 2 vice-side winding insertion points as 3 winding differential mode inductances of A/B.
Wherein, the decanting point of common mode electromagnetic noise injection network 25 can be in any position in common mode circuit, can Realize the inhibiting effect of common mode electromagnetic noise.The common mode circuit that the present invention mentions refers to common mode current ICMInside the electrical equipment flowed through Device, circuit, input cable and the earth.
Figure 22 is the power supply adaptor simplified electrical circuit diagram of one provided in an embodiment of the present invention exchange input, with reference to Figure 22 institutes Show, black arrow is designated as common mode current ICMThe common mode circuit flowed through.Common mode circuit is from firewire L, zero curve N, rectifier bridge BD1 anodes With the line of capacitance C1, the line of rectifier bridge BD1 cathode and capacitance C1, the drain electrode and drain electrode of transistor Q1 and posting for the earth Raw capacitance CIt posts, into the earth；Another common mode circuit connects the anode of rectifier diode and the parasitic capacitance of the earth from transformer CIt posts, into the earth.
The decanting point for the common mode electromagnetic noise injection network that the embodiment of the present invention proposes can select A, B, C and D point, unlike Differential mode electromagnetic noise injection network can select single-point to be injected, and the decanting point of common mode electromagnetic noise injection network must select Pairing injection.When using the common mode electromagnetic noise injection network based on capacitance shown in Figure 17, it is necessary to while A points and B need to be used Point is as capacitance C1 and the tie point of capacitance C2.Equally, when the common mode electromagnetic noise injection network using 3 winding common mode inductances When, it is necessary to while it is inserted into the vice-side winding of common mode inductance in A points and B points.
Figure 23 is the Switching Power Supply simplified electrical circuit diagram of a direct current provided in an embodiment of the present invention input, with reference to Figure 23 institutes Show, the circuit of black arrow instruction is common mode current ICMThe common mode circuit flowed through.Common mode circuit is from input anode with capacitance C1's Line, the line of input cathode and capacitance C1, the line of capacitance C1 and transistor Q1 drain electrodes, capacitance C1 and transistor Q2 source electrodes Line, the parasitic capacitance C between transistor Q1 and transistor Q2 bridge arms midpoint and the earthIt posts, in transistor Q3 and transistor Q4 bridge arms Parasitic capacitance C between point and the earthIt posts, transformer T1, transformer T1Parasitic capacitance C between the earthIt postsAnd the earth.
The decanting point for the common mode electromagnetic noise injection network that the embodiment of the present invention proposes can select A, B, C and D point, unlike Differential mode electromagnetic noise injection network can select single-point to be injected, and the decanting point of common mode electromagnetic noise injection network must select Pairing injection.When using common mode electromagnetic noise injection network based on capacitance, it is necessary to while need to be by the use of A points and B points as capacitance The tie point of C1 and capacitance C2.Equally, when using the common mode electromagnetic noise injection network based on 3 winding common mode inductances, it is necessary to The vice-side winding of common mode inductance is inserted into A points and B points simultaneously.
Figure 24 is the schematic diagram of electromagnetic noise switching network provided in an embodiment of the present invention, with reference to shown in Fig. 8 to Figure 24, this 22 major function of electromagnetic noise switching network that inventive embodiments propose is the difference for exporting prime electromagnetic noise processing network 21 Mould electromagnetic noise and common mode electromagnetic noise are amplified to be handled with closed loop feedback, then is exported to the differential mode electromagnetic noise injection of rear class Network 23 and common mode electromagnetic noise injection network 25.Electromagnetic noise switching network 22 can use operational amplifier, the first capacitance-resistance net Network 35 and second resistance-capacitance network 36 realizes gain amplification and closed loop feedback.Electromagnetic noise switching network 22 can be by adjusting Resistance and capacitance carry out Gain tuning and phase adjustment in one resistance-capacitance network 35 and the second resistance-capacitance network 36, inhibit electricity to realize The gain and phase that magnetic noise needs.
Electromagnetic noise extraction network 32, the differential mode electromagnetic noise injection network for the diversified forms that the embodiment of the present invention proposes 23rd, common mode electromagnetic noise injection network 25 and processing after the decanting point of differential mode electromagnetic noise and common mode electromagnetic noise can basis Practical application needs to carry out arbitrary combination.
The active EMI filter technology that the embodiment of the present invention proposes is applicable not only to ac power supply system, is also applied for direct current Electric power system.
The active EMI filter technology that the embodiment of the present invention proposes is suitable for the I class electrical equipments inputted with ground wire, is also suitable In the II class electrical equipments that no ground wire inputs.
Embodiment one
Figure 25 is the schematic diagram of active Electromagnetic interference filter that the embodiment of the present invention one provides, with reference to shown in Figure 25, the present invention Embodiment one proposes a kind of active Electromagnetic interference filter, and embodiment one handles network 21 by electromagnetic noise and extracts electrical equipment The electromagnetic noise of generation obtains differential mode electromagnetic noise and common mode electromagnetic noise, then passes through 2 electromagnetic noise transition nets respectively respectively It, will treated differential mode electromagnetic noise by differential mode electromagnetic noise injection network 23 after network 22 carries out gain and closed loop feedback processing By differential mode circuit to offset the differential mode noise that rear class electrical equipment generates in differential mode circuit, while noted by common mode electromagnetic noise Entering network 25, common mode electromagnetic noise returns to the common-mode noise source in electrical equipment by common mode circuit by treated, so as to real Endless form inside existing electromagnetic noise, meets the requirement of electromagnetic interference (EMI) regulation limit value so that electric power system and surrounding enviroment It is not influenced by the electromagnetic noise that electrical equipment generates.
The present invention proposes that electromagnetic noise processing network 21 is made of 2 current transformers in embodiment one, and it is poor to obtain respectively Mould electromagnetic noise generates differential-mode current IDMThe common mode current I generated with common mode electromagnetic noiseCM。
The embodiment of the present invention proposes that the differential mode electromagnetic noise injection network 23 in embodiment one is used based on semiconductor crystal The differential mode electromagnetic noise injection network of pipe；The present invention proposes that the common mode electromagnetic noise injection network 25 in embodiment one uses and is based on The common mode electromagnetic noise injection network of capacitance.
Embodiment two
Figure 26 is the schematic diagram of active Electromagnetic interference filter provided by Embodiment 2 of the present invention, with reference to shown in Figure 26, the present invention Embodiment two proposes a kind of active Electromagnetic interference filter, and the electricity of the extraction electrical equipment generation of network 21 is handled by electromagnetic noise Magnetic noise, obtains differential mode electromagnetic noise and common mode electromagnetic noise respectively, then respectively by 2 electromagnetic noise switching networks 22, into After row gain and closed loop feedback processing, by differential mode electromagnetic noise injection network 23, by treated, differential mode electromagnetic noise passes through difference The differential mode noise that rear class electrical equipment in differential mode circuit generates is offset, while by common mode electromagnetic noise injection network in mould circuit 25th, by treated, common mode electromagnetic noise returns to the common-mode noise source in electrical equipment by common mode circuit, so as to fulfill electricity Endless form inside magnetic noise, meets the requirement of electromagnetic interference (EMI) regulation limit value so that electric power system and surrounding enviroment not by The electromagnetic noise that electrical equipment generates influences.
The present invention proposes that electromagnetic noise processing network 21 is by electromagnetic noise sampling network 31 and poor common mode electricity in embodiment two Magnetic noise extraction network 32 forms.Wherein, electromagnetic noise sampling network 31 passes through current transformer sample mode.Electromagnetic noise carries Network 32 is taken to carry out the extraction of differential mode electromagnetic noise and common mode electromagnetic noise using magnetic counteracting mode.The present invention proposes embodiment two In differential mode electromagnetic noise injection network 23 use the differential mode electromagnetic noise injection network based on semiconductor transistor；The present invention carries The common mode electromagnetic noise injection network 25 gone out in embodiment two uses the common mode electromagnetic noise injection network based on capacitance.
Embodiment three
Figure 27 is the schematic diagram of active Electromagnetic interference filter that the embodiment of the present invention three provides, with reference to shown in Figure 27, the present invention Embodiment three proposes a kind of active Electromagnetic interference filter, and the electricity of the extraction electrical equipment generation of network 21 is handled by electromagnetic noise Magnetic noise obtains differential mode electromagnetic noise and common mode electromagnetic noise, then is carried out respectively by 2 electromagnetic noise switching networks 22 respectively After gain and closed loop feedback processing, by differential mode electromagnetic noise injection network 23, by treated, differential mode electromagnetic noise passes through differential mode The differential mode noise that rear class electrical equipment in differential mode circuit generates is offset, while by common mode electromagnetic noise injection network 25 in circuit By treated, common mode electromagnetic noise returns to the common-mode noise source in electrical equipment by common mode circuit, makes an uproar so as to fulfill electromagnetism Endless form inside sound, meets the requirement of electromagnetic interference (EMI) regulation limit value so that electric power system and surrounding enviroment are not by electricity consumption The electromagnetic noise that equipment generates influences.
The present invention proposes that electromagnetic noise processing network 21 is by electromagnetic noise sampling network 31 and poor common mode electricity in embodiment three Magnetic noise extraction network 32 forms.Wherein electromagnetic noise sampling network 31 passes through current transformer sample mode, poor common mode electromagnetism Noise extraction network 32 is realized by way of operational amplifier algebraical sum.
The present invention proposes that the differential mode electromagnetic noise injection network 23 in embodiment three uses the difference based on semiconductor transistor Mould electromagnetic noise injection network；The present invention proposes that the common mode electromagnetic noise injection network 25 in embodiment three is used based on capacitance Common mode electromagnetic noise injection network.
Example IV
Figure 28 is the schematic diagram of active Electromagnetic interference filter that the embodiment of the present invention four provides, with reference to shown in Figure 28, the present invention Example IV proposes a kind of active Electromagnetic interference filter, and the electricity of the extraction electrical equipment generation of network 21 is handled by electromagnetic noise Magnetic noise obtains differential mode electromagnetic noise and common mode electromagnetic noise, then is carried out respectively by 2 electromagnetic noise switching networks 22 respectively After gain and closed loop feedback processing, by differential mode electromagnetic noise injection network 23, by treated, differential mode electromagnetic noise passes through differential mode The differential mode noise that rear class electrical equipment in differential mode circuit generates is offset, while by common mode electromagnetic noise injection network 25 in circuit By treated, common mode electromagnetic noise returns to the common-mode noise source in electrical equipment by common mode circuit, makes an uproar so as to fulfill electromagnetism Endless form inside sound, meets the requirement of electromagnetic interference (EMI) regulation limit value so that electric power system and surrounding enviroment are not by electricity consumption The electromagnetic noise that equipment generates influences.
The present invention proposes that electromagnetic noise processing network 21 is by electromagnetic noise sampling network 31 and poor common mode electricity in example IV Magnetic noise extraction network 32 forms.Wherein electromagnetic noise sampling network 31 is made an uproar by differential mode inductance sample mode, poor common mode electromagnetism Sound extraction network 32 is realized by way of operational amplifier algebraical sum.
The present invention proposes that the differential mode electromagnetic noise injection network 23 in example IV uses the difference based on semiconductor transistor Mould electromagnetic noise injection network；The present invention proposes that the common mode electromagnetic noise injection network 25 in example IV is used based on capacitance Common mode electromagnetic noise injection network.
Embodiment five
Figure 29 is the schematic diagram of active Electromagnetic interference filter that the embodiment of the present invention five provides, with reference to shown in Figure 29, the present invention Embodiment five proposes a kind of active Electromagnetic interference filter, and the electricity of the extraction electrical equipment generation of network 21 is handled by electromagnetic noise Magnetic noise obtains differential mode electromagnetic noise and common mode electromagnetic noise, then is carried out respectively by 2 electromagnetic noise switching networks 22 respectively After gain and closed loop feedback processing, by differential mode electromagnetic noise injection network 23, by treated, differential mode electromagnetic noise passes through differential mode The differential mode noise that rear class electrical equipment in differential mode circuit generates is offset, while by common mode electromagnetic noise injection network 25 in circuit By treated, common mode electromagnetic noise returns to the common-mode noise source in electrical equipment by common mode circuit, makes an uproar so as to fulfill electromagnetism Endless form inside sound, meets the requirement of electromagnetic interference (EMI) regulation limit value so that electric power system and surrounding enviroment are not by electricity consumption The electromagnetic noise that equipment generates influences.
The present invention proposes that electromagnetic noise processing network 21 is by electromagnetic noise sampling network 31 and poor common mode electricity in embodiment five Magnetic noise extraction network 32 forms.Wherein electromagnetic noise sampling network 31 passes through current transformer sample mode, poor common mode electromagnetism Noise extraction network 32 is realized by way of operational amplifier algebraical sum.
The present invention proposes that the differential mode electromagnetic noise injection network 23 in embodiment five is used based on double winding differential mode inductance Differential mode electromagnetic noise injection network；The present invention proposes that the common mode electromagnetic noise injection network 25 in embodiment five is used based on common mode The common mode electromagnetic noise injection network of inductance.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical features into Row equivalent replacement；And these modifications or replacement, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution The range of scheme.

Claims (10)

1. a kind of common mode electromagnetic noise injection network, which is characterized in that including injection member and common mode circuit；Wherein,
The injection member at least has common mode electromagnetic noise component inputs and circuit end；
The common mode electromagnetic noise component inputs are used to input common mode electromagnetic noise component；The circuit end is returned with the common mode Any point connection in road, for injecting the common mode electromagnetic noise component；
The injection member has and only includes capacitance group or have and only include winding inductance.
2. common mode electromagnetic noise injection network according to claim 1, which is characterized in that the injection member includes three Capacitance, respectively the first capacitance, the second capacitance and third capacitance；
The first end of first capacitance is the common mode electromagnetic noise component inputs, second capacitance and third electricity Two first ends held are the circuit end；
Three second ends of first capacitance, second capacitance and the third capacitance connect simultaneously.
3. common mode electromagnetic noise injection network according to claim 1, which is characterized in that the injection member is ground connection electricity Hold, the first end of the ground capacity is the common mode electromagnetic noise component inputs, and the second end of the ground capacity is institute State circuit end.
4. common mode electromagnetic noise injection network according to claim 1, which is characterized in that the common mode circuit is common mode electricity The circuit that stream flows through, including electrical equipment input circuit, electrical equipment housing or the earth.
5. common mode electromagnetic noise injection network according to claim 1, which is characterized in that further include and be connected to electric power system Input cable between electrical equipment, it is defeated that the input cable includes be connected in parallel between electric power system and electrical equipment first Enter cable and the second input cable；
The injection member is three winding common mode inductance, and the three winding of the three winding common mode inductance is respectively primary side winding, secondary Winding NS1With vice-side winding NS2, the vice-side winding NS1With vice-side winding NS2Opposite and polarity is identical；Wherein,
One end of the primary side winding is the common mode electromagnetic noise component inputs, and another termination of the primary side winding refers to Ground；
The vice-side winding NS1With the vice-side winding NS2First end and the described first input cable and second input line Cable connects one to one, the vice-side winding NS1With the vice-side winding NS2Second end be the circuit end.
6. common mode electromagnetic noise injection network according to claim 1, which is characterized in that setting electrical equipment includes fire Line, zero curve, rectifier bridge and capacitance；Wherein,
The firewire and the zero curve are connect with the rectifier bridge, and the capacitance connection is in the anode and cathode of the rectifier bridge Between；
The input circuit of the circuit end and electrical equipment connects；
Connection of the corresponding decanting point in the circuit end between the firewire and the anode of the capacitance and the rectifier bridge On line, for injecting simultaneously.
7. common mode electromagnetic noise injection network according to claim 1, which is characterized in that setting electrical equipment includes input Anode line, input cathode line and capacitance；
The first end of the capacitance is connected on the input anode line, and the second end of the capacitance is connected to the input and bears On the line of pole；
The corresponding decanting point in the circuit end of the injection member is located at the input anode line and the input cathode line On, for injecting simultaneously.
8. a kind of active Electromagnetic interference filter, which is characterized in that including the common mode electricity as described in any one of claim 1-7 Magnetic noise injection network.
9. active Electromagnetic interference filter according to claim 8, which is characterized in that further include electromagnetic noise transition net Network；
The electromagnetic noise switching network includes the first resistance-capacitance network, the second resistance-capacitance network and operational amplifier；Wherein,
The first end of first resistance-capacitance network is used to receive the common-mode noise component that common mode electromagnetic noise extraction network is exported, The second end of first resistance-capacitance network is connect with the negative input of the operational amplifier；
Second resistance-capacitance network is connected between the electrode input end and negative input of the operational amplifier；
The common mode electromagnetic noise point of the output terminal of the operational amplifier and the injection member of the common mode electromagnetic noise injection network Input terminal connection is measured, the common mode electromagnetic noise component inputs are for common mode of the input from the electromagnetic noise switching network Electromagnetic noise component.
10. active Electromagnetic interference filter according to claim 9, which is characterized in that further include common mode electromagnetic noise and carry Network is taken, for extracting the common mode electromagnetic noise inputted in cable；
The common mode electromagnetic noise extraction network is connect with the electromagnetic noise switching network.
CN201810518652.2A 2018-05-25 2018-05-25 Common mode electromagnetic noise injection network and active Electromagnetic interference filter Pending CN108233355A (en)

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