CN207652310U - Common mode electromagnetic noise extracts network and active Electromagnetic interference filter - Google Patents

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

Info

Publication number
CN207652310U
CN207652310U CN201820813429.6U CN201820813429U CN207652310U CN 207652310 U CN207652310 U CN 207652310U CN 201820813429 U CN201820813429 U CN 201820813429U CN 207652310 U CN207652310 U CN 207652310U
Authority
CN
China
Prior art keywords
electromagnetic noise
common mode
mode electromagnetic
network
input cable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201820813429.6U
Other languages
Chinese (zh)
Inventor
黄敏超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minye Information Technology Shanghai Co Ltd
Original Assignee
Minye Information Technology Shanghai Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minye Information Technology Shanghai Co Ltd filed Critical Minye Information Technology Shanghai Co Ltd
Priority to CN201820813429.6U priority Critical patent/CN207652310U/en
Application granted granted Critical
Publication of CN207652310U publication Critical patent/CN207652310U/en
Priority to PCT/CN2019/088496 priority patent/WO2019223801A1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

Abstract

The utility model is related to a kind of common mode electromagnetic noise extraction network and active Electromagnetic interference filters, it includes the input cable being connected between power supply system and electrical equipment and electromagnetic noise sampler and common mode electromagnetic noise extractor that the common mode electromagnetic noise, which extracts network,；The electromagnetic noise sampler is arranged between the input cable and the common mode electromagnetic noise extractor, for the poor common mode electromagnetic noise to the input cable sample and export the poor common mode electromagnetic noise sampled to the common mode electromagnetic noise extractor；The common mode electromagnetic noise extractor is for extracting and exporting the common mode electromagnetic noise in the poor common mode electromagnetic noise that the electromagnetic noise sampler is sampled.

Description

Common mode electromagnetic noise extracts network and active Electromagnetic interference filter
Technical field
The utility model is related to technical field of filtering, and network and active electrical are extracted more particularly, to a kind of common mode electromagnetic noise Magnetic disturbance filter.
Background technology
Fig. 1 is the connection diagram of electrical equipment and power supply 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 power supply 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 regulation limit values.Wherein, power supply system can be ac power supply system, can also be DC power-supply system.
Fig. 2 is the application schematic diagram of existing passive electromagnetic interface filter, as shown in Fig. 2, dry to meet the electromagnetism in EMC regulations It disturbs (referred to as " EMI "), almost all of electrical equipment can all use and constitute passive electromagnetic interface filter by passive device, be serially connected with use Between electric equipment and power supply system, to inhibit the electromagnetic noise in electrical equipment, meets the requirement of EMI regulations limitation, avoid shadow Ring power supply 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, avoids 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, the load electricity for bearing electrical equipment simultaneously is needed Stream, so as to cause additional loss and fever, reduces the efficiency and reliability of electrical equipment；
Second, bulky：To bear electrical equipment load current, common mode inductance and differential mode inductance volume are inevitably resulted in Increase, even more than the volume of electrical equipment functional circuitry, becomes to put the cart before the horse；
Third, cost increases：For meet different frequency range electromagnetic noise suppression needs, it usually needs use different magnetic materials Common mode inductance inhibit the electromagnetic noise of different frequency range, necessarily lead to multiple-stage filtering framework in this way, eventually lead to passive EMI filters Wave device cost increases, and volume further increases, while also causing more to be lost and generate heat；
Fourth, near-field coupling：Since passive device volume is big and the influence of stray parameter, it is close that electromagnetic noise occurs in high band Field coupling 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 concept structure of the defect of filter, active EMI filter is 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 including the earth or shell composition is injected by capacitance, to realize the inhibition of common-mode noise.
But since 3 windings of common mode inductance cannot reach complete coupling, can always there be 3% ~ 5% or so leakage inductance, To while being coupled to common mode electromagnetic noise, 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, 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.Also include common mode simultaneously however, can include differential mode electromagnetic noise on the DC bus of power supply Therefore electromagnetic noise includes not only differential mode electromagnetic noise from the electromagnetic noise that inductance obtains, also includes common mode electromagnetic noise. 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 reaches 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 using standard linear impedance matching network（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 Power supply grid system is returned to after mould electromagnetic noise source, and common mode current is co-flow in inputting cable, 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, therefore, poor common-mode noise in electrical equipment is carried out completely isolated extraction and be injected separately into be to realize 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 will 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 will 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, 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 is received machine examination and measures after LISN is coupled.
Utility model content
The purpose of this utility model is to provide a kind of common mode electromagnetic noises to extract network, including the common mode electromagnetic noise carries Take the active Electromagnetic interference filter of network that can use the common mode electromagnetic noise of electric equipment is a small amount of even not enter power supply system In so that surrounding enviroment and power supply grid are not influenced by the electromagnetic noise of electrical equipment, while could be used that electric equipment meets The requirement of EMI regulation limit values.
The utility model provides a kind of common mode electromagnetic noise extraction network, and it includes connection which, which extracts network, Input cable and electromagnetic noise sampler between power supply system and electrical equipment and common mode electromagnetic noise extractor；
The electromagnetic noise sampler is arranged between the input cable and the common mode electromagnetic noise extractor, is used for The poor common mode electromagnetic noise of the input cable sample and export the poor common mode electromagnetic noise sampled to described total Mould electromagnetic noise extractor；
The common mode electromagnetic noise extractor is for extracting and exporting the poor common mode that the electromagnetic noise sampler is sampled Common mode electromagnetic noise in electromagnetic noise.
Further, the input cable includes the first input cable and the second input cable in parallel；
The electromagnetic noise sampler includes the first sampler and the second sampler；Wherein,
On the first input cable, first sampler is made an uproar with the common mode electromagnetism for the first sampler setting Sound extractor connects；
On the second input cable, second sampler is made an uproar with the common mode electromagnetism for the second sampler setting Sound extractor connects.
Further, the input cable includes the first input cable and the second input cable in parallel；
The electromagnetic noise sampler includes inductance, the inductance include two primary side windings and two secondary samplers around Group；Wherein,
Two primary side windings are coupled with two secondary sampler winding one-to-one correspondence；
One of them described primary side winding is serially connected between the first input cable and electrical equipment, another described original Side winding is serially connected between the second input cable and electrical equipment；
Two first ends of two secondary sampler windings are connected to ground, two of two secondary sampler windings Second end is used to export the poor common mode electromagnetic noise of corresponding input cable.
Further, the input cable includes the first input cable and the second input cable in parallel；
The common mode electromagnetic noise extractor is double winding inductance；Wherein,
The polarity of described two windings is on the contrary, the first end of two windings of the common mode electromagnetic noise extractor is used respectively In the poor common mode electromagnetic noise for receiving the first input cable and the second input cable, the common mode electromagnetic noise extraction The second end of two windings of device is used to output common mode electromagnetic noise.
Further, the input cable includes the first input cable and the second input cable in parallel；
The common mode electromagnetic noise extractor includes the first operational amplifier, resistance R1, resistance R2, resistance R3 and resistance R4；Wherein,
The first end of the resistance R1 is used to receive the poor common mode electromagnetic noise of the first input cable, the resistance R2 First end be used to receive the poor common mode electromagnetic noise of the second input cable, the second end of the resistance R1 and the resistance The second end of R2 is connect with the negative input of first operational amplifier；The resistance R3 is connected to first operation Between the negative input and output end of amplifier；The resistance R4 is connected to the electrode input end of first operational amplifier Between ground.
Common mode electromagnetic noise extraction network provided by the utility model includes being connected between power supply system and electrical equipment Input cable and electromagnetic noise sampler and common mode electromagnetic noise extractor；Also, electromagnetic noise sampler is arranged defeated Enter between cable and common mode electromagnetic noise extractor, for the poor common mode electromagnetic noise for inputting cable sample and will be adopted The poor common mode electromagnetic noise of sample is exported to common mode electromagnetic noise extractor；Common mode electromagnetic noise extractor is for extracting and exporting electricity Common mode electromagnetic noise in the poor common mode electromagnetic noise that magnetic noise sampler is sampled.Common mode electromagnetic noise extraction network passes through Electromagnetic noise sampler to input cable poor common mode electromagnetic noise carry out sampling and by the poor common mode electromagnetic noise sampled it is defeated Go out to be equivalent to common mode electromagnetic noise extractor to common mode electromagnetic noise extractor and be extracted from the input cable of electrical equipment indirectly Common mode electromagnetic noise, in active Electromagnetic interference filter, the common mode electromagnetic noise extracted passes through electromagnetic noise switching network Gain and closed loop feedback processing are carried out, common mode electromagnetic noise after treatment passes through by common mode electromagnetic noise injection network Common mode circuit returns to the common-mode noise source in electrical equipment, in this way, the common mode electromagnetic noise of electrical equipment can on a small quantity even Do not enter in power supply system so that surrounding enviroment and power supply grid are not influenced by the electromagnetic noise of electrical equipment, while also can Electrical equipment is allowed to meet the requirement of EMI regulation limit values.
The another object of the utility model, which also resides in, provides a kind of active Electromagnetic interference filter, active Electromagnetic interference filter Wave device includes common mode electromagnetic noise extraction network as described above.
Further, further include electromagnetic noise switching network and common mode electromagnetic noise injection network；
The common mode electromagnetic noise extraction network, the electromagnetic noise switching network and the common mode electromagnetic noise inject net Network is sequentially connected.
The advantageous effect of active Electromagnetic interference filter provided by the utility model compared with the prior art, is same as this practicality The advantageous effect of the common mode electromagnetic noise extraction network of novel offer compared with the prior art, details are not described herein again.
Description of the drawings
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art Specific implementation mode or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art Under the premise of labour, other attached drawings are can also be obtained according to these attached drawings.
Fig. 1 is the connection diagram of electrical equipment and power supply 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 for the active Electromagnetic interference filter filtering technique that the utility model embodiment provides；
Fig. 8 is the first schematic diagram that the electromagnetic noise that the utility model embodiment provides handles network；
Fig. 9 is the second schematic diagram that the electromagnetic noise that the utility model embodiment provides handles network；
Figure 10 is the first schematic diagram of the electromagnetic noise sampling network that the utility model embodiment provides；
Figure 11 is the second schematic diagram of the electromagnetic noise sampling network that the utility model embodiment provides；
Figure 12 is the first schematic diagram that the electromagnetic noise that the utility model embodiment provides extracts network；
Figure 13 is the second schematic diagram that the electromagnetic noise that the utility model embodiment provides extracts network；
Figure 14 is the differential mode electromagnetic noise injection network based on semiconductor transistor that the utility model embodiment provides Schematic diagram；
Figure 15 is the differential mode electromagnetic noise injection network based on double winding differential mode inductance that the utility model embodiment provides Schematic diagram；
Figure 16 is the differential mode electromagnetic noise injection network based on 3 winding differential mode inductances that the utility model embodiment provides Schematic diagram；
Figure 17 is the schematic diagram for the common mode electromagnetic noise injection network based on capacitance that the utility model embodiment provides；
Figure 18 is the signal for the common mode electromagnetic noise injection network based on ground capacity that the utility model embodiment provides Figure；
Figure 19 is the signal for the common mode electromagnetic noise injection network based on inductance electromagnetism that the utility model embodiment provides Figure；
Figure 20 is the power supply adaptor simplified electrical circuit diagram for the exchange input that the utility model embodiment provides；
Figure 21 is the Switching Power Supply simplified electrical circuit diagram for the direct current input that the utility model embodiment provides；
Figure 22 is the power supply adaptor simplified electrical circuit diagram for the exchange input that the utility model embodiment provides；
Figure 23 is the Switching Power Supply simplified electrical circuit diagram for the direct current input that the utility model embodiment provides；
Figure 24 is the schematic diagram for the electromagnetic noise switching network that the utility model embodiment provides；
Figure 25 is the schematic diagram for the active Electromagnetic interference filter that the utility model embodiment one provides；
Figure 26 is the schematic diagram for the active Electromagnetic interference filter that the utility model embodiment two provides；
Figure 27 is the schematic diagram for the active Electromagnetic interference filter that the utility model embodiment three provides；
Figure 28 is the schematic diagram for the active Electromagnetic interference filter that the utility model embodiment four provides；
Figure 29 is the schematic diagram for the active Electromagnetic interference filter that the utility model embodiment five provides.
Reference numeral：
1- first inputs cable；2- second inputs cable；01- common mode electromagnetic noise extractors；02- differential mode electromagnetic noises carry Take 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 networks；25- common mode electromagnetic noise injection networks；31- electromagnetic noise sampling networks；32- difference common modes Electromagnetic noise extracts network；The first operational amplifiers of 33-；34- second operational amplifiers；The first resistance-capacitance networks of 35-；36- second Resistance-capacitance network；100- first inputs the electromagnetic noise of cable；101- second inputs the electromagnetic noise of cable；108- common mode electromagnetism is made an uproar Sound output terminal；109- differential mode electromagnetic noise output ends.
Specific implementation mode
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally All other embodiment that field those of ordinary skill is obtained without making creative work, belongs to this practicality Novel protected range.
It is in the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", " perpendicular Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only The utility model and simplifying describes for ease of description, do not indicate or imply the indicated device or element must have it is specific Orientation, with specific azimuth configuration and operation, therefore should not be understood as limiting the present invention.In addition, term " the One ", " second ", " third " are used for description purposes only, and are not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally Connection；It can be mechanical connection, can also be electrical connection；Can be directly connected, can also indirectly connected through an intermediary, It can be the connection inside two elements.For the ordinary skill in the art, it can understand above-mentioned art with concrete condition The concrete meaning of language in the present invention.
Fig. 7 is the schematic diagram for the active EMI filter technology that the utility model embodiment provides, with reference to shown in Fig. 7, for biography Unite passive electromagnetic interface filter and existing active EMI filter the shortcomings that, the utility model embodiment proposes that a kind of poor common mode electromagnetism is made an uproar The active EMI filter technology that sound inhibits respectively, practical that the technology is implemented with active Electromagnetic interference filter, active Electromagnetic interference For filter by electromagnetic noise processing network 21, electromagnetic noise switching network 22, differential mode electromagnetic noise injection network 23 and common mode are electric Magnetic noise injection network 25 forms.
The active EMI filter technology that the utility model embodiment proposes handles network 21 by electromagnetic noise and is set from electricity consumption After extracting differential mode electromagnetic noise and common mode electromagnetic noise in standby input cable respectively, it is separately input to electromagnetic noise switching network 22 carry out gain and closed loop feedback processing, and differential mode electromagnetic noise and common mode electromagnetic noise after treatment are made an uproar by differential mode electromagnetism Sound injection network 23 and common mode electromagnetic noise injection network 25 are by electromagnetic noise after processing, respectively by differential mode circuit and altogether Mould circuit returns to differential mode noise source and common-mode noise source in electrical equipment.In this way, cycle inside electromagnetic noise may be implemented, Allow the electromagnetic noise of electrical equipment is a small amount of not enter in power supply system even so that surrounding enviroment and power supply grid are not set by electricity consumption The influence of standby 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 utility model embodiment proposes is made an uproar in electromagnetic noise processing network 21, differential mode electromagnetism Sound injection network 23 and common mode electromagnetic noise injection network 25 have following key innovations：
1. using independent differential mode electromagnetic noise in the electromagnetic noise processing network 21 that the utility model embodiment proposes Network is extracted, rear class electromagnetic noise switching network 22 is output to and carries out gain and closed loop feedback processing.The utility model embodiment The electromagnetic noise extraction network of the differential mode of diversified forms is proposed to coordinate the electromagnetic noise switching network 22 and differential mode electromagnetism of rear class Noise injection network 23.
The electromagnetic noise processing network for the differential mode that the utility model embodiment proposes may be implemented big with common mode electromagnetic noise In the isolation of 60dB, it is equivalent to the common mode electromagnetic noise only less than 0.1% in the differential mode electromagnetic noise of extraction so that electromagnetism Noise suppression effect can reach expected inhibition.
2. using independent common mode electromagnetic noise in the electromagnetic noise processing network 21 that the utility model embodiment proposes Network is extracted, rear class electromagnetic noise switching network 22 is output to and carries out gain and closed loop feedback processing.
The utility model embodiment proposes that the electromagnetic noise of the common mode of diversified forms extracts network, to coordinate the electromagnetism of rear class Noise switching network 22 and common mode electromagnetic noise injection network 25.The electromagnetic noise for the common mode that the utility model embodiment proposes carries It takes network that the isolation for being more than 60dB with differential mode electromagnetic noise may be implemented, is equivalent in the common mode electromagnetic noise of extraction only not To 0.1% differential mode electromagnetic noise so that electromagnetic noise suppression effect can reach expected inhibition.
3. the active EMI filter that the utility model embodiment proposes uses independent differential mode electromagnetic noise injection network 23, by the differential mode circuit of treated differential mode electromagnetic noise is injected into electrical equipment, pass through the differential mode resistance changed in differential mode circuit Resist to inhibit differential mode electromagnetic noise.The utility model embodiment proposes the differential mode electromagnetic noise injection network 23 of diversified forms, will The differential mode circuit of prime treated differential mode electromagnetic noise is injected into electrical equipment, passes through the differential mode resistance changed in differential mode circuit It is anti-, to realize the inhibiting effect of electromagnetic noise.
4. the active EMI filter that the utility model embodiment proposes uses independent common mode electromagnetic noise injection network 25, respectively by the common mode circuit of treated common mode electromagnetic noise is injected into electrical equipment, then return in electrical equipment Common-mode noise source forms internal cycle.The utility model embodiment proposes the common mode electromagnetic noise injection network 25 of diversified forms, By the common mode circuit of prime treated common mode electromagnetic noise is injected into electrical equipment, the common mode in electrical equipment is then returned to Noise source forms internal cycle, realizes the inhibiting effect of electromagnetic noise.
5. the active EMI filter that the utility model embodiment proposes has the flexibility of differential mode electromagnetic noise decanting point, Differential mode electromagnetic noise can be being injected from input cable to any point in the differential mode circuit in rear class electrical equipment, pass through change Differential-mode impedance in differential mode circuit realizes the inhibiting effect of electromagnetic noise.
6. the active EMI filter that the utility model embodiment proposes has the flexibility of common mode electromagnetic noise decanting point, Injection common mode electromagnetic noise can be being carried out from input cable to any point in the common mode circuit in rear class electrical equipment, then Back to the common mode electromagnetic noise source in electrical equipment, internal cycle is formed, realizes the inhibiting effect of electromagnetic noise.
It makes an uproar below for electromagnetic noise processing network 21, the differential mode electromagnetism of the diversified forms of the utility model embodiment proposition Sound injection network 23, common mode electromagnetic noise injection network 25 and flexible electromagnetic noise decanting point are illustrated one by one.
It is a variety of realization methods that electromagnetic noise handles network below.
The electromagnetic noise processing network 21 that the active EMI filter that the utility model embodiment proposes uses is made an uproar including electromagnetism Sound extracts network, and electromagnetic noise extraction network has 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 extract network, make an uproar for extracting differential mode electromagnetic noise and common mode electromagnetism Sound.
Wherein, electromagnetic noise extraction network includes common mode electromagnetic noise extractor and differential mode electromagnetic noise extractor；Wherein, Common mode electromagnetic noise extractor is used to extract and export the common mode electromagnetic noise of the input cable；Differential mode electromagnetic noise extractor Differential mode electromagnetic noise for extracting and exporting the input cable.
In single-stage extraction network, common mode electromagnetic noise extractor is used to directly extract and export the common mode electromagnetism of input cable Noise；Differential mode electromagnetic noise extractor is used to directly extract and export the differential mode electromagnetic noise of input cable.
Two-stage is extracted in network, and common mode electromagnetic noise extractor is used to extract and export indirectly the common mode electromagnetism of input cable Noise；Differential mode electromagnetic noise extractor is used to extract and export indirectly the differential mode electromagnetic noise of input cable.
Fig. 8 is the first schematic diagram that the electromagnetic noise that the utility model embodiment provides handles network, with reference to shown in Fig. 8, In single-stage extraction network, common mode electromagnetic noise extractor and differential mode electromagnetic noise extractor are current transformer, are directly extracted Differential mode electromagnetic noise and common mode electromagnetic noise are output to rear class electromagnetic noise switching network 22, carry out at gain and closed loop feedback Reason.
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 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 that common mode electromagnetism is made an uproar Acoustoelectric current ICM。
Similarly, it is inserted in the direction for inputting cable according to differential mode electromagnetic noise extractor 02 and flows through the side of electric current 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 the electromagnetic noise that the utility model embodiment provides handles network, with reference to shown in Fig. 9, The realization method of two-stage extraction network is made of two parts network：Electromagnetic noise sampling network 31 and poor common mode electromagnetic noise extraction Network 32.
The setting of electromagnetic noise sampling network 31 between input cable and poor common mode electromagnetic noise extraction network 32, for pair The poor common mode electromagnetic noise of input cable sample and export the poor common mode electromagnetic noise sampled to poor common mode electromagnetism making an uproar Sound extracts network 32；Common mode electromagnetic noise extractor is for extracting and exporting the poor common mode that electromagnetic noise sampling network 31 is sampled Common mode electromagnetic noise in electromagnetic noise；Differential mode electromagnetic noise extractor is for extracting and exporting 31 institute of electromagnetic noise sampling network Differential mode electromagnetic noise in the poor common mode electromagnetic noise of sampling.
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. The various ways realization method of electromagnetic noise sampling network 31 can according to the actual application with rear differential common mode electromagnetic noise The a variety of realization methods for extracting network 32 carry out arbitrary combination, make an uproar to obtain purer differential mode electromagnetic noise and common mode electromagnetism Sound, the 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 the electromagnetic noise sampling network that the utility model embodiment provides, referring to Fig.1 0 institute Show, in first method, the first sampler 001 and the second sampler 002 are current transformer；Wherein, the first sampler 001 is set It sets on the first input cable 1, the first sampler 001 connects with common mode electromagnetic noise extractor or differential mode electromagnetic noise extractor It connects；The setting of second sampler 002 is on the second input cable 2, the second sampler 002 and common mode electromagnetic noise extractor or differential mode Electromagnetic noise extractor.
Every cable can be added current transformer and carry out using the electromagnetic noise current in cable, and the electromagnetism being achieved in that is made an uproar Sound will include common mode electromagnetic noise and differential mode electromagnetic noise in cable.
Figure 11 is the second schematic diagram of the electromagnetic noise sampling network that the utility model embodiment provides, referring to Fig.1 1 institute Show, in second method, electromagnetic noise sampling network includes inductance L1, and inductance L1 includes two primary side winding NP1And NP2With two Secondary sampler 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 A primary side winding NP1And NP2Correspond coupling, two secondary sampler winding NS1And NS2Two second ends be used to output pair The poor common mode electromagnetic noise of cable should be inputted.
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, 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 side 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 will include common mode electromagnetic noise in cable and differential mode electromagnetism is made an uproar 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, to obtain purer differential mode electricity Magnetic noise and common mode electromagnetic noise, the input as rear class electromagnetic noise switching network 22.Poor common mode electromagnetic noise extracts network 32 a variety of realization methods can with a variety of realization methods of prime electromagnetic noise sampling network 31, according to the actual application into The arbitrary combination of row, to obtain purer differential mode electromagnetic noise and common mode electromagnetic noise, as rear class electromagnetic noise transition net The input of network 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 the electromagnetic noise that the utility model embodiment provides extracts network, referring to Fig.1 2 institute Showing, poor common mode electromagnetic noise extraction network 32 can be realized by way of the winding induced voltage counteracting of magnetic device, with Obtain purer differential mode electromagnetic noise and common mode electromagnetic noise, wherein common mode electromagnetic noise extractor and differential mode electromagnetism are made an uproar Sound extractor is double winding inductance, respectively L1 and L2；Wherein, the double winding inductance L1 that common mode electromagnetic noise extractor uses Two windings polarity on the contrary, the first end of two windings of common mode electromagnetic noise extractor be respectively used to receive first input Cable 1 and second inputs the poor common mode electromagnetic noise of cable 2, and the second end of two windings of common mode electromagnetic noise extractor is used In output common mode electromagnetic noise；The polarity of two windings for the double winding inductance L2 that differential mode electromagnetic noise extractor uses is identical, The first end of two windings of differential mode electromagnetic noise extractor is respectively used to receive the first input input cable 2 of cable 1 and second Poor common mode electromagnetic noise, differential mode electromagnetic noise extractor use double winding inductance L1 and double winding inductance L2 two windings Second end be 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 inputs in cable 2 is in the same direction, and first inputs cable 1 It is reversed 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 type 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 Identical one end of two winding polarities of sense L2 is 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 as differential mode electromagnetic noise after even.
The differential-mode current that first input cable 1 and second inputs in cable 2 is reversed 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 has 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 the electromagnetic noise that the utility model embodiment provides extracts network, referring to Fig.1 3 institute Show, poor common mode electromagnetic noise extraction network 32 can also be realized with the mode of operational amplifier logarithm sum, purer to obtain Net 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 R3 and resistance R4 Lai real The purpose of differential mode electromagnetic noise is now isolated.The negative input of first operational amplifier 33 is connected with resistance R1, R2 and R3, and 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 is connected with resistance R3, while as common mode electromagnetic noise output end, the electricity of the other end of resistance R1 and the first input cable Magnetic noise 100 is connected；The other end of resistance R2 is connected with the electromagnetic noise 101 of the second input cable.According to operational amplifier and Addition of algebra may be implemented in the connection type of resistor network, by the electromagnetic noise current I of the first input cable 1Input 1And input line 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, isolation Fall differential mode electromagnetic noise IDM。
According to the method for above-mentioned acquisition common mode electromagnetic noise, subtraction may be implemented 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 end is connected with resistance R7, while as the output end 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 may be implemented according to the connection type of operational amplifier and resistor network, by the first input cable 1 Electromagnetic noise current IInput1 and second input cable 2 electromagnetic noise current IInput 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 the realization method of addition of algebra and algebraically subtraction.
Wherein, involved+Vcc and-Vcc indicates 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.
Figure 14 is the differential mode electromagnetic noise injection network based on semiconductor transistor that the utility model embodiment provides Schematic diagram, referring to Fig.1 shown in 4, the differential mode electromagnetic noise injection network based on semiconductor transistor, wherein semiconductor transistor For field-effect transistor Q1, drain electrode is connected to the first input cable 1, and source electrode is connected to electrical equipment, and gate pole is connected to The differential mode electromagnetic noise output end 109 of prime electromagnetic noise switching network 22.
The active EMI filter that the utility model embodiment proposes can be changed using the gate voltage of transistor Q1 to adjust Differential-mode impedance on section the first input cable 1, to realize the purpose for inhibiting differential mode electromagnetic noise.
It is in the 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 the differential mode electromagnetic noise injection network based on double winding differential mode inductance that the utility model embodiment provides Schematic diagram, referring to Fig.1 shown in 5, the differential mode electromagnetic noise injection network based on double winding differential mode inductance, wherein double winding is poor Mould inductance L3 has 2 windings：Primary side winding NPWith vice-side winding NS；The primary side winding N of double winding differential mode inductance L3POne end connects The differential mode electromagnetic noise output end 109 of prime electromagnetic noise switching network 22 is connect, the other end does grounding；Double winding differential mode electricity Feel the vice-side winding N of L3SOne termination first input cable 1, another termination rear class electrical equipment.
The active EMI filter that the utility model embodiment proposes can utilize the primary side of inductance double winding differential mode inductance L3 Winding NPThe differential-mode component of prime electromagnetic noise switching network 22 is coupled to the vice-side winding N of double winding differential mode inductance L3SPlace Differential mode circuit in, to change the differential-mode impedance in differential mode circuit, to realize inhibit differential mode noise purpose.
Figure 16 is the differential mode electromagnetic noise injection network based on 3 winding differential mode inductances that the utility model embodiment provides Schematic diagram, referring to Fig.1 shown in 6, the differential mode electromagnetic noise injection network based on 3 winding differential mode inductances, wherein 3 winding differential mode electricity Feeling L4 has 3 windings：Primary side winding NP1, vice-side winding NS1With vice-side winding NS2；The primary side winding of 3 winding differential mode inductance L4 NP1One end connects the differential mode electromagnetic noise output end 109 of prime electromagnetic noise switching network 22, and the other end does grounding；3 around The vice-side winding N of group differential mode inductance L4S1One termination first input cable 1, another termination rear class electrical equipment；3 winding differential modes The vice-side winding N of inductance L4S2One termination second input cable 2, another termination rear class electrical equipment.
The active Electromagnetic interference filter that the utility model embodiment proposes can utilize the primary side of 3 winding differential mode inductance L4 Winding NP1The differential mode electromagnetic noise output end 109 of prime electromagnetic noise switching network 22 is coupled to 3 winding differential mode inductance L4's Vice-side winding NS1With vice-side winding NS2In the differential mode circuit at place, to change the differential-mode impedance in differential mode circuit, inhibit to realize The purpose of differential mode noise.
It is the realization method of common mode electromagnetic noise injection network below.
Common mode electromagnetic noise injection network can also be realized with various ways：Common mode electromagnetic noise based on capacitance injects net Network, the common mode electromagnetic noise injection network based on ground capacity and the common mode electromagnetic noise injection network based on common mode inductance.
Figure 17 is the schematic diagram for the common mode electromagnetic noise injection network based on capacitance that the utility model embodiment provides, ginseng Shown in Figure 17, the common mode electromagnetic noise injection network based on capacitance, wherein one end of capacitance C1, capacitance C2 and C3 are connected to Together；The other end of capacitance C1 is connected with the first input cable 1 and rear class electrical equipment, the other end of capacitance C2 and the second input Cable 2 is connected with rear class electrical equipment；The common mode electromagnetic noise of the other end and prime electromagnetic noise switching network 22 of capacitance C3 Output end 108 is connected.
The utility model embodiment propose active EMI filter can by capacitance C3, capacitance C1 and capacitance C2 will before The common mode electromagnetic noise output end 108 of grade electromagnetic noise switching network 22 is injected into common mode circuit, to allow common mode current to return To common-mode noise source in rear class electrical equipment, the purpose of suppression common mode electromagnetic noise is played, while realizing and EMI is allowed to receive machine testing On a small quantity.Even it cannot detect common-mode noise.
The connection type of common mode electromagnetic noise injection network based on capacitance not only may be used due to that need not be related to the earth Be applicable in the I class electrical equipments of input tape the earth, be also applied for inputting II classes electrical equipment and the direct current confession without the earth The electrical equipment of electricity.
Figure 18 is the signal for the common mode electromagnetic noise injection network based on ground capacity that the utility model embodiment provides Figure, referring to Fig.1 shown in 8, the common mode electromagnetic noise injection network based on ground capacity, one end connection prime electricity of wherein capacitance C4 The shell of the common mode electromagnetic noise output end 108 of magnetic noise switching network 22, another termination the earth or electrical equipment.
The active EMI filter that the utility model embodiment proposes can be by capacitance C4 by prime electromagnetic noise transition net The common mode output component of network 22 is injected into common-mode noise circuit, and common mode electromagnetic noise is allowed to return to common-mode noise source as soon as possible, can be with It is a small amount of even common-mode noise not to be detected by EMI receivers.
Figure 19 is the signal for the common mode electromagnetic noise injection network based on common mode electromagnetism that the utility model embodiment provides Figure, referring to Fig.1 shown in 9, the common mode electromagnetic noise injection network based on common mode inductance, common mode inductance L5 has 3 windings：Primary side around Group NP1, vice-side winding NS1With vice-side winding NS2.The primary side winding N of common mode inductance L5P1One end connection prime electromagnetic noise conversion The common mode electromagnetic noise output end 108 of network 22, other end ground connection；The vice-side winding N of common mode inductance L5S1One end is connected to first Cable 1 is inputted, 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, the other end is connected to electrical equipment.
The active Electromagnetic interference filter that the utility model embodiment proposes can pass through the primary side winding N of inductance L5P1 will The common mode output component of prime electromagnetic noise switching network 22, the vice-side winding N through inductance L5S1And NS2It is injected into common-mode noise Circuit, 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 utility model embodiment proposes can be that differential mode returns Any position in road can realize the inhibiting effect of differential mode electromagnetic noise.The differential mode mentioned in the utility model embodiment returns Road refers to differential-mode current IDMThe device inside electrical equipment, circuit and the input cable flowed through.
Figure 20 is the power supply adaptor simplified electrical circuit diagram for the exchange input that the utility model embodiment provides, with reference to figure Shown in 20, 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 curve N, while it including the line between device.The differential mode electromagnetic noise decanting point that the utility model embodiment proposes is in Figure 20 institutes 4 points of A, B, C and D can be selected to be injected in the circuit shown, wherein A points be firewire L, B point be rectifier bridge BD1 anodes with The line of capacitance C1, C points are the line of rectifier bridge BD1 cathode and capacitance C1, and 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 for the direct current input that the utility model embodiment provides, with reference to Figure 21 Shown, the circuit of black arrow instruction is differential-mode current IDMThe differential mode circuit flowed through.Differential mode circuit is from the positive line of input, capacitance C1 to input cathode line.The differential mode electromagnetic noise decanting point that the utility model embodiment proposes can select A in figure 21 Point and B points are injected.A points are the line of input 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 vice-side winding insertion points of 2 points of the A/B as 3 winding differential mode inductances.
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 utility model is mentioned refers to common mode current ICMThe electrical equipment flowed through Internal device, circuit, input cable and the earth.
Figure 22 is the power supply adaptor simplified electrical circuit diagram for the exchange input that the utility model embodiment provides, with reference to figure Shown in 22, 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 The line of anode and capacitance C1, the line of rectifier bridge BD1 cathode and capacitance C1, the drain electrode of transistor Q1, and drain electrode and the earth Parasitic capacitance CIt posts, into the earth；Another common mode circuit connects the parasitism of the anode and the earth of rectifier diode from transformer Capacitance CIt posts, into the earth.
The decanting point for the common mode electromagnetic noise injection network that the utility model embodiment proposes can select A, B, C and D point, Unlike differential mode electromagnetic noise injection network can select single-point to be injected, the decanting point of common mode electromagnetic noise injection network is necessary Selection pairing injection.When using common mode electromagnetic noise injection network based on capacitance shown in Figure 17, it is necessary to while A points need to be used Tie point with B points as capacitance C1 and capacitance C2.Equally, when the common mode electromagnetic noise injection net using 3 winding common mode inductances When network, it is necessary to while being 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 for the direct current input that the utility model embodiment provides, with reference to Figure 23 Shown, the circuit of black arrow instruction is common mode current ICMThe common mode circuit flowed through.Common mode circuit from input anode with capacitance C1 Line, input the line of 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, transistor Q3 and transistor Q4 bridge arms Parasitic capacitance C between midpoint 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 utility model embodiment proposes can select A, B, C and D point, Unlike differential mode electromagnetic noise injection network can select single-point to be injected, the decanting point of common mode electromagnetic noise injection network is necessary Selection pairing injection.When using common mode electromagnetic noise injection network based on capacitance, it is necessary at the same need to use A points and B points as The tie point of capacitance C1 and capacitance C2.Equally, when using the common mode electromagnetic noise injection network based on 3 winding common mode inductances, Must the vice-side winding of common mode inductance be inserted into A points and B points simultaneously.
Figure 24 is the schematic diagram for the electromagnetic noise switching network that the utility model embodiment provides, with reference to Fig. 8 to Figure 24 institutes Show, 22 major function of electromagnetic noise switching network that the utility model embodiment proposes is that prime electromagnetic noise is handled network 21 The differential mode electromagnetic noise and common mode electromagnetic noise of output are amplified to be handled with closed loop feedback, then is exported to the differential mode electromagnetism of rear class Noise injection network 23 and common mode electromagnetic noise injection network 25.Electromagnetic noise switching network 22 can use operational amplifier, the One resistance-capacitance network 35 and the second resistance-capacitance network 36 realize gain amplification and closed loop feedback.Electromagnetic noise switching network 22 can lead to It crosses resistance and capacitance in the first resistance-capacitance network 35 of adjustment and the second resistance-capacitance network 36 and carries out Gain tuning and phase adjustment, come real Now inhibit the gain and phase that electromagnetic noise needs.
Electromagnetic noise extraction network, the differential mode electromagnetic noise injection network for the diversified forms that the utility model embodiment proposes 23, 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 utility model embodiment proposes is applicable not only to ac power supply system, is also applied for DC power-supply system.
The I class electrical equipments that the active EMI filter technology that the utility model embodiment proposes is suitable for inputting with ground wire, The II class electrical equipments inputted suitable for no ground wire.
Embodiment one
Figure 25 is the schematic diagram for the active Electromagnetic interference filter that the utility model embodiment one provides, with reference to Figure 25 institutes Show, the utility model embodiment one proposes that a kind of active Electromagnetic interference filter, embodiment one handle network by electromagnetic noise The electromagnetic noise that 21 extraction electrical equipments generate, obtains differential mode electromagnetic noise and common mode electromagnetic noise, then pass through 2 respectively respectively After electromagnetic noise switching network 22 carries out gain and closed loop feedback processing, after being handled by differential mode electromagnetic noise injection network 23 Differential mode electromagnetic noise the differential mode noise that rear class electrical equipment in differential mode circuit generates is offset by differential mode circuit, while by By treated, common mode electromagnetic noise returns to being total in electrical equipment to common mode electromagnetic noise injection network 25 by common mode circuit Mode noise source meets the requirement of electromagnetic interference (EMI) regulation limit value to realize endless form inside electromagnetic noise so that supplies Electric system and surrounding enviroment are not influenced by the electromagnetic noise that electrical equipment generates.
The utility model proposes electromagnetic noise processing networks 21 in embodiment one to be made of 2 current transformers, obtains respectively It obtains differential mode electromagnetic noise and generates differential-mode current IDMThe common mode current I generated with common mode electromagnetic noiseCM。
The utility model embodiment proposes the differential mode electromagnetic noise injection network 23 in embodiment one using based on semiconductor The differential mode electromagnetic noise injection network of transistor；The utility model proposes the common mode electromagnetic noise injection networks 25 in embodiment one Using the common mode electromagnetic noise injection network based on capacitance.
Embodiment two
Figure 26 is the schematic diagram for the active Electromagnetic interference filter that the utility model embodiment two provides, with reference to Figure 26 institutes Show, the utility model embodiment two proposes a kind of active Electromagnetic interference filter, and handling the extraction of network 21 by electromagnetic noise uses The electromagnetic noise that electric equipment generates obtains differential mode electromagnetic noise and common mode electromagnetic noise, then passes through 2 electromagnetic noises respectively respectively Switching network 22, after carrying out gain and closed loop feedback processing, will treated differential mode by differential mode electromagnetic noise injection network 23 Electromagnetic noise offsets the differential mode noise that rear class electrical equipment generates in differential mode circuit by differential mode circuit, while by common mode electricity Magnetic noise injection network 25, by treated common mode electromagnetic noise by common mode circuit back to the common-mode noise in electrical equipment Source meets the requirement of electromagnetic interference (EMI) regulation limit value so that power supply system to realize endless form inside electromagnetic noise And surrounding enviroment are not influenced by the electromagnetic noise that electrical equipment generates.
The utility model proposes electromagnetic noise processing networks 21 in embodiment two to be total to by electromagnetic noise sampling network 31 and difference Mould electromagnetic noise is extracted network 32 and is formed.Wherein, electromagnetic noise sampling network 31 passes through current transformer sample mode.Poor common mode Electromagnetic noise extraction network 32 offsets the extraction that mode carries out differential mode electromagnetic noise and common mode electromagnetic noise using magnetic.
The utility model proposes the differential mode electromagnetic noise injection networks 23 in embodiment two using based on semiconductor transistor Differential mode electromagnetic noise injection network；The utility model proposes the common mode electromagnetic noise injection networks 25 in embodiment two to use base In the common mode electromagnetic noise injection network of capacitance.
Embodiment three
Figure 27 is the schematic diagram for the active Electromagnetic interference filter that the utility model embodiment three provides, with reference to Figure 27 institutes Show, the utility model embodiment three proposes a kind of active Electromagnetic interference filter, and handling the extraction of network 21 by electromagnetic noise uses The electromagnetic noise that electric equipment generates obtains differential mode electromagnetic noise and common mode electromagnetic noise, then passes through 2 electromagnetic noises respectively respectively After switching network 22 carries out gain and closed loop feedback processing, by differential mode electromagnetic noise injection network 23, by treated, differential mode is electric Magnetic noise offsets the differential mode noise that rear class electrical equipment generates in differential mode circuit by differential mode circuit, while by common mode electromagnetism By treated, common mode electromagnetic noise returns to the common-mode noise source in electrical equipment to noise injection network 25 by common mode circuit, To realize endless form inside electromagnetic noise, meet the requirement of electromagnetic interference (EMI) regulation limit value so that power supply system and week Surrounding environment is not influenced by the electromagnetic noise that electrical equipment generates.
The utility model proposes electromagnetic noise processing networks 21 in embodiment three to be total to by electromagnetic noise sampling network 31 and difference Mould electromagnetic noise is extracted network 32 and is formed.Wherein electromagnetic noise sampling network 31 passes through current transformer sample mode, poor common mode Electromagnetic noise extraction network 32 is realized by way of operational amplifier algebraical sum.
The utility model proposes the differential mode electromagnetic noise injection networks 23 in embodiment three using based on semiconductor transistor Differential mode electromagnetic noise injection network；The utility model proposes the common mode electromagnetic noise injection networks 25 in embodiment three to use base In the common mode electromagnetic noise injection network of capacitance.
Example IV
Figure 28 is the schematic diagram for the active Electromagnetic interference filter that the utility model embodiment four provides, with reference to Figure 28 institutes Show, the utility model embodiment four proposes a kind of active Electromagnetic interference filter, and handling the extraction of network 21 by electromagnetic noise uses The electromagnetic noise that electric equipment generates obtains differential mode electromagnetic noise and common mode electromagnetic noise, then passes through 2 electromagnetic noises respectively respectively After switching network 22 carries out gain and closed loop feedback processing, by differential mode electromagnetic noise injection network 23, by treated, differential mode is electric Magnetic noise offsets the differential mode noise that rear class electrical equipment generates in differential mode circuit by differential mode circuit, while by common mode electromagnetism By treated, common mode electromagnetic noise returns to the common-mode noise source in electrical equipment to noise injection network 25 by common mode circuit, To realize endless form inside electromagnetic noise, meet the requirement of electromagnetic interference (EMI) regulation limit value so that power supply system and week Surrounding environment is not influenced by the electromagnetic noise that electrical equipment generates.
The utility model proposes electromagnetic noise processing networks 21 in example IV to be total to by electromagnetic noise sampling network 31 and difference Mould electromagnetic noise is extracted network 32 and is formed.Wherein electromagnetic noise sampling network 31 is made an uproar by inductance sample mode, poor common mode electromagnetism Sound extraction network 32 is realized by way of operational amplifier algebraical sum.
The utility model proposes the differential mode electromagnetic noise injection networks 23 in example IV using based on semiconductor transistor Differential mode electromagnetic noise injection network；The utility model proposes the common mode electromagnetic noise injection networks 25 in example IV to use base In the common mode electromagnetic noise injection network of capacitance.
Embodiment five
Figure 29 is the schematic diagram for the active Electromagnetic interference filter that the utility model embodiment five provides, with reference to Figure 29 institutes Show, the utility model embodiment five proposes a kind of active Electromagnetic interference filter, and handling the extraction of network 21 by electromagnetic noise uses The electromagnetic noise that electric equipment generates obtains differential mode electromagnetic noise and common mode electromagnetic noise, then passes through 2 electromagnetic noises respectively respectively After switching network 22 carries out gain and closed loop feedback processing, by differential mode electromagnetic noise injection network 23, by treated, differential mode is electric Magnetic noise offsets the differential mode noise that rear class electrical equipment generates in differential mode circuit by differential mode circuit, while by common mode electromagnetism By treated, common mode electromagnetic noise returns to the common-mode noise source in electrical equipment to noise injection network 25 by common mode circuit, To realize endless form inside electromagnetic noise, meet the requirement of electromagnetic interference (EMI) regulation limit value so that power supply system and week Surrounding environment is not influenced by the electromagnetic noise that electrical equipment generates.
The utility model proposes electromagnetic noise processing networks 21 in embodiment five to be total to by electromagnetic noise sampling network 31 and difference Mould electromagnetic noise is extracted network 32 and is formed.Wherein electromagnetic noise sampling network 31 passes through current transformer employing mode, poor common mode Electromagnetic noise extraction network 32 is realized by way of operational amplifier algebraical sum.
The utility model proposes the differential mode electromagnetic noise injection networks 23 in embodiment five using based on double winding differential mode electricity The differential mode electromagnetic noise injection network of sense；The utility model proposes the uses of common mode electromagnetic noise injection network 25 in embodiment five Common mode electromagnetic noise injection network based on common mode inductance.
Finally it should be noted that：The above various embodiments is only to illustrate the technical solution of the utility model, rather than limits it System；Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should Understand：It still can be with technical scheme described in the above embodiments is modified, either to which part or whole Technical characteristic carries out equivalent replacement；And these modifications or replacements, this practicality that it does not separate the essence of the corresponding technical solution are new The range of each embodiment technical solution of type.

Claims (7)

1. a kind of common mode electromagnetic noise extracts network, which is characterized in that including being connected between power supply system and electrical equipment Input cable and electromagnetic noise sampler and common mode electromagnetic noise extractor；
The electromagnetic noise sampler is arranged between the input cable and the common mode electromagnetic noise extractor, for institute The poor common mode electromagnetic noise for stating input cable carries out sampling and exports the poor common mode electromagnetic noise sampled to common mode electricity Magnetic noise extractor；
The common mode electromagnetic noise extractor is for extracting and exporting the poor common mode electromagnetism that the electromagnetic noise sampler is sampled Common mode electromagnetic noise in noise.
2. common mode electromagnetic noise according to claim 1 extracts network, which is characterized in that the input cable includes parallel connection First input cable and second input cable；
The electromagnetic noise sampler includes the first sampler and the second sampler；Wherein,
On the first input cable, first sampler is carried with the common mode electromagnetic noise for the first sampler setting Device is taken to connect；
On the second input cable, second sampler is carried with the common mode electromagnetic noise for the second sampler setting Device is taken to connect.
3. common mode electromagnetic noise according to claim 1 extracts network, which is characterized in that the input cable includes parallel connection First input cable and second input cable；
The electromagnetic noise sampler includes inductance, and the inductance includes two primary side windings and two secondary sampler windings；Its In,
Two primary side windings are coupled with two secondary sampler winding one-to-one correspondence；
One of them described primary side winding be serially connected in it is described first input cable and electrical equipment between, another described primary side around Group is serially connected between the second input cable and electrical equipment；
Two first ends of two secondary sampler windings are connected to ground, two second of two secondary sampler windings End is used to export the poor common mode electromagnetic noise of corresponding input cable.
4. common mode electromagnetic noise according to claim 1 extracts network, which is characterized in that the input cable includes parallel connection First input cable and second input cable；
The common mode electromagnetic noise extractor is double winding inductance；Wherein,
The polarity of two windings in the double winding inductance on the contrary, two windings of the common mode electromagnetic noise extractor One end is respectively used to receive the poor common mode electromagnetic noise of the first input cable and the second input cable, the common mode electricity The second end of two windings of magnetic noise extractor is used to output common mode electromagnetic noise.
5. common mode electromagnetic noise according to claim 1 extracts network, which is characterized in that the input cable includes parallel connection First input cable and second input cable；
The common mode electromagnetic noise extractor includes the first operational amplifier, resistance R1, resistance R2, resistance R3 and resistance R4；Its In,
The first end of the resistance R1 is used to receive the poor common mode electromagnetic noise of the first input cable, and the of the resistance R2 Poor common mode electromagnetic noise of the one end for receiving the second input cable, the second end of the resistance R1 and the resistance R2's Second end is connect with the negative input of first operational amplifier；The resistance R3 is connected to first operation amplifier Between the negative input and output end of device；The resistance R4 is connected to the electrode input end and ground of first operational amplifier Between.
6. a kind of active Electromagnetic interference filter, which is characterized in that include the common mode electricity as described in any one of claim 1-5 Magnetic noise extracts network.
7. active Electromagnetic interference filter according to claim 6, which is characterized in that further include electromagnetic noise switching network With common mode electromagnetic noise injection network；
Common mode electromagnetic noise extraction network, the electromagnetic noise switching network and the common mode electromagnetic noise injection network according to Secondary connection.
CN201820813429.6U 2018-05-25 2018-05-25 Common mode electromagnetic noise extracts network and active Electromagnetic interference filter Active CN207652310U (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201820813429.6U CN207652310U (en) 2018-05-25 2018-05-25 Common mode electromagnetic noise extracts network and active Electromagnetic interference filter
PCT/CN2019/088496 WO2019223801A1 (en) 2018-05-25 2019-05-27 Common-mode electromagnetic noise extraction network and active electromagnetic interference filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820813429.6U CN207652310U (en) 2018-05-25 2018-05-25 Common mode electromagnetic noise extracts network and active Electromagnetic interference filter

Publications (1)

Publication Number Publication Date
CN207652310U true CN207652310U (en) 2018-07-24

Family

ID=62876261

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201820813429.6U Active CN207652310U (en) 2018-05-25 2018-05-25 Common mode electromagnetic noise extracts network and active Electromagnetic interference filter

Country Status (2)

Country Link
CN (1) CN207652310U (en)
WO (1) WO2019223801A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019223801A1 (en) * 2018-05-25 2019-11-28 敏业信息科技（上海）有限公司 Common-mode electromagnetic noise extraction network and active electromagnetic interference filter
WO2019223803A1 (en) * 2018-05-25 2019-11-28 敏业信息科技（上海）有限公司 Differential mode electromagnetic noise extraction network and active electromagnetic interference filter
WO2019223802A1 (en) * 2018-05-25 2019-11-28 敏业信息科技（上海）有限公司 Differential mode electromagnetic noise injection network and active electromagnetic interference filter

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004274161A (en) * 2003-03-05 2004-09-30 Tdk Corp Noise suppression circuit
CN104079164B (en) * 2014-06-30 2017-06-13 华为技术有限公司 A kind of active EMI filter and electric power controller
KR101710781B1 (en) * 2015-04-15 2017-02-27 강원대학교산학협력단 Active EMI filter apparatus by coupling common mode filter and differential mode filter
FR3053191A1 (en) * 2016-06-24 2017-12-29 Orange MEASUREMENT AND DIAGNOSIS OF EXTERNAL NOISE FOR TRANSMISSION SYSTEM ON BIFILAR ELECTRIC LINE
CN108233355A (en) * 2018-05-25 2018-06-29 敏业信息科技（上海）有限公司 Common mode electromagnetic noise injection network and active Electromagnetic interference filter
CN207559960U (en) * 2018-05-25 2018-06-29 敏业信息科技（上海）有限公司 Differential mode electromagnetic noise extracts network and active Electromagnetic interference filter
CN207652310U (en) * 2018-05-25 2018-07-24 敏业信息科技（上海）有限公司 Common mode electromagnetic noise extracts network and active Electromagnetic interference filter
CN108418569B (en) * 2018-05-25 2018-11-09 敏业信息科技（上海）有限公司 Differential mode electromagnetic noise injection network and active Electromagnetic interference filter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019223801A1 (en) * 2018-05-25 2019-11-28 敏业信息科技（上海）有限公司 Common-mode electromagnetic noise extraction network and active electromagnetic interference filter
WO2019223803A1 (en) * 2018-05-25 2019-11-28 敏业信息科技（上海）有限公司 Differential mode electromagnetic noise extraction network and active electromagnetic interference filter
WO2019223802A1 (en) * 2018-05-25 2019-11-28 敏业信息科技（上海）有限公司 Differential mode electromagnetic noise injection network and active electromagnetic interference filter
US11218073B2 (en) 2018-05-25 2022-01-04 Minye Information Tech. (Shanghai) Co., Ltd. Differential mode electromagnetic noise injection network and active electromagnetic interference filter

Also Published As

Publication number Publication date
WO2019223801A1 (en) 2019-11-28

Similar Documents

Publication Publication Date Title
CN108418569B (en) Differential mode electromagnetic noise injection network and active Electromagnetic interference filter
CN108233355A (en) Common mode electromagnetic noise injection network and active Electromagnetic interference filter
CN207559960U (en) Differential mode electromagnetic noise extracts network and active Electromagnetic interference filter
CN207652310U (en) Common mode electromagnetic noise extracts network and active Electromagnetic interference filter
CN105720582B (en) A kind of particular harmonic eliminates radio energy transmission system and its design method
CN104769452B (en) Transmission with improved radio frequency isolation/reception switching circuit
CN105470963B (en) A kind of Active Power Filter-APF and its control method
US20100109832A1 (en) Method and apparatus for adjusting displacement current in an energy transfer element
CN111987899B (en) LCL-EMI filter decoupling magnetic integration method for single-phase grid-connected converter
CN104034957B (en) Power conversion system and its voltage sampling apparatus
CN211785700U (en) Differential-common mode signal separator and artificial power network system
CN103856176B (en) Adopt the LCL filter of coupling inductance
CN206023716U (en) A kind of preamplifier of Low Magnetic field MRI spectrometer
CN107947115A (en) Monitoring is with suppressing transformer DC magnetic bias system in a kind of AT tractive power supply systems
CN205103301U (en) Hourglass current detection circuit who restraines common mode interference
CN104868774A (en) Grid-connected inverter of combination of LCL and multiple LC branches and current control method
CN205901578U (en) Wave filter with coupling inductance
CN105262331B (en) A kind of heavy DC wave filter
CN208849677U (en) Zero-voltage switch push-pull circuit with magnetic integrated morphology
CN106443508A (en) Low-noise and high-sensitivity inductive magnetic sensor
CN102856063B (en) For the transformer of isolated amplifier
CN107171325A (en) A kind of plug and play integrated modular active harmonics isolator
CN208706426U (en) Two-way integrates variable ratio mutual inductor
CN206584812U (en) A kind of optical fiber transferring high voltage current transformer of eccentrically arranged type
CN104459265B (en) The balanced compensated transformer measurement circuit of mutual inductor spurious impedance

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant