CN1851973B - Wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter - Google Patents
Wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter Download PDFInfo
- Publication number
- CN1851973B CN1851973B CN200610042760A CN200610042760A CN1851973B CN 1851973 B CN1851973 B CN 1851973B CN 200610042760 A CN200610042760 A CN 200610042760A CN 200610042760 A CN200610042760 A CN 200610042760A CN 1851973 B CN1851973 B CN 1851973B
- Authority
- CN
- China
- Prior art keywords
- filter
- passive
- electromagnetic interference
- frequency
- common mode
- 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.)
- Expired - Fee Related
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 21
- 239000002178 crystalline material Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Abstract
This invention discloses a broad band high attenuation common mode conductive electromagnetic interference parallel mixed filter including a passive common mode filter inductor LCM, the input end of which is serial to the output of the HF current inductor LCT to make up of an active filter and a passive filter, the passive common mode filter inductor is serial to a noise source device to filter the HF electromagnetic noise effectively and correct the source impedance property of the device, in which, the output of the operational amplifier is parallel to the resistor by two high voltage ceramic condensers to be connected to the input of a small passive common mode inductor and works at the open loop state, the input of which is serial to the network side of the device by a HF current mutual inductor.
Description
Technical field
The invention belongs to the production and the application of Electromagnetic interference filter, relate to a kind of active Electromagnetic interference filter of parallel connection mixed type of wide-frequency-band high-attenuation multiple.
Background technology
When current power electronic equipment was used widely and is developed rapidly, the electromagnetic interference (EMI) problem that is accompanied by it was also more and more serious.Particularly in recent years, power inverter is constantly advancing towards high frequency, technique direction efficient, high power density, and this is to the electromagnetic noise that how effectively to suppress switching device and produce great challenge especially.The passive electromagnetic interface filter that is made of passive components such as inductance, electric capacity of extensive use at present is bulky in low-frequency range, and filter effect is not good enough, and the relative high frequency part then shows good filtering performance.And active filter, is difficult in the broad frequency band scope though possess good noise attentuation ability in low frequency part owing to be subjected to the restriction of active element self gain bandwidth product, and especially high band is difficult to obtain bigger noise attentuation multiple.According to the data-searching that the applicant carried out, also there be not at present the product and the relevant report of the parallel connection mixed type common mode EMI filters that active element such as associative operation amplifier and passive electrical sensing unit constitute.
Summary of the invention
The objective of the invention is to, a kind of wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter is provided, this hybrid filter has overcome on the one hand that traditional passive electromagnetic interface filter volume is big, the shortcoming of Heavy Weight, and passive filter high band good wave filtering effect, the advantage that overall dimension is little have been kept; Overcome the not enough shortcoming of active filter high-frequency noise decay on the other hand, and kept the advantage that active filter low-frequency compensation ability is strong, volume is little.This mixed type electromagnetic interface filter has been realized learning from other's strong points to offset one's weaknesses between active and the passive filter, has complementary advantages, and is specially adapted to the Conducted Electromagnetic Interference inhibition of power electronic equipments such as Switching Power Supply.
The technical solution that realizes above-mentioned purpose is: a kind of wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter is characterized in that this filter comprises a passive common mode filter inductance L
CM, this passive common mode filter inductance L
CMInput and HF current transformer L
CTOutput be in series, constitute the hybrid filter of source filter and passive filter;
Passive common mode filter inductance L
CMThe coiling direction of former and deputy limit winding identical, former and deputy limit winding is in series with the end of incoming cables of noise source equipment respectively;
HF current transformer L
CTBe wound with 3 windings respectively, 3 windings are the homophase coiling, and wherein 2 windings are connected in series to the output of impedance stable network LISN respectively, an end ground connection of another winding, and the other end of this winding is by series resistance R
1An input of concatenation operation amplifier, another input of operational amplifier passes through resistance R
2Ground connection, the output of operational amplifier is connected to the passive common mode inductance L by 2 higfh-tension ceramics electric capacity with output signal
CMInput, the output of operational amplifier is also by a resistance R
3Ground connection.
This filter adopts the small passive common mode inductance, has revised the impedance operator of noise source equipment, makes its load characteristic be tending towards perception more, is beneficial to the application of shunt active power filter, and the electromagnetic noise of high band can be easily by the small inductor filtering simultaneously.The passive EMI filter element that this inductance is traditional relatively, overall dimension and weight all reduce significantly.
The filter effect of filter of the present invention, not only comparing merely, passive or active filter all has clear improvement and improves.And, the filter effect of parallel connection mixed type electromagnetic interface filter involved in the present invention, much larger than active and passive filter filter effect sum, mixing is not a simple addition.This filter has characteristics such as circuit structure is simple, design is convenient, volume is little, in light weight, the noise attentuation ability is strong, is specially adapted to the Conducted Electromagnetic Interference inhibition of power electronic equipments such as Switching Power Supply.
Description of drawings
Fig. 1 is the active compound filter circuit structure of an electromagnetic interference of the present invention schematic diagram;
Fig. 2 is the theoretical model figure of the active compound filter of electromagnetic interference of the present invention;
Fig. 3 is applied to the photo of actual device for the active compound filter of electromagnetic interference of the present invention;
Fig. 4 is the experimental result of the active compound filter of electromagnetic interference of the present invention;
The embodiment that realizes below in conjunction with accompanying drawing and inventor and the present invention are used for the operation principle that the 300W computer switching power supply exchanges end of incoming cables common mode electromagnetic interference inhibition and are described in further detail.
Embodiment
See figures.1.and.2, wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter of the present invention comprises a passive common mode filter inductance L
CM, this passive common mode filter inductance L
CMInput and HF current transformer L
CTOutput be in series, constitute passive filter and active filter hybrid filter;
Passive common mode filter inductance L
CMThe coiling direction of former and deputy limit winding identical, former and deputy limit winding respectively with the end of incoming cables of noise source equipment with being in series;
HF current transformer L
CTBe wound with 3 windings respectively, 3 windings are the homophase coiling, and wherein 2 windings are connected in series to the output of impedance stable network LISN respectively, an end ground connection of another winding, and the other end is by a resistance R
1Be connected in series to an input (negative pole) of operational amplifier A, another input (positive pole) of operational amplifier A is by a resistance R
2Ground connection, the output of operational amplifier A is connected to passive small-sized common mode inductance L by 2 higfh-tension ceramics electric capacity with output signal
CMInput, the output of operational amplifier A is also by a resistance R
3Ground connection.
Source common mode filtering inductance L
CMThe employing non-crystalline material is made, and operational amplifier A is operated in open loop situations, i.e. no any being electrically connected between input and the output.
Because the signal of the active part of hybrid filter is connected in the input of noise source equipment in parallel, the offset current of generation and noise current opposite sign but equal magnitude injects electrical network, can equivalence be a controlled current source therefore.The open-loop gain that is provided with the source part is A, and the reactance of passive common mode filter inductance is Z
1, the common mode equivalent resistance of source impedance stabilizing network LISN is R, the equivalent common code impedance of noise source equipment is Z
n, parallel connection mixed type electromagnetic interface filter then involved in the present invention can be used model description shown in Figure 2.
In this model, when system only adopted the passive common mode filter inductance, its insertion loss (insertionloss---IL) was
When system advanced to adopt pure active filter, its insertion loss was
If system adopts active and passive hybrid architecture, its insertion loss is
As seen, adopt active and passive mixed filtering structure can obtain higher decay, and its noise attentuation ability is much larger than active and simple addition passive filter noise attentuation than any one simple filter.
Operational amplifier is mainly realized the further amplification to detection signal.In order to obtain higher gain, operational amplifier is operated in open loop situations.Bandwidth of operational amplifiers is enough wide simultaneously, so that the noise signal in the detected frequency band of instrument transformer all can distortionlessly be amplified.According to the design standard of national electromagnetic compatibility, information electrical type equipment disturbed test frequency band range is 150kHz～30MHz, so bandwidth of operational amplifiers should be not less than 50MHz.
The photo that the active hybrid electromagnetic interference filter that the inventor finishes by technique scheme is applied to the 300W computer switching power supply as shown in Figure 3.The common mode filtering small inductor adopts non-crystalline material, diameter 30mm, former and deputy limit winding is equal 16 circles, and current sampling mutual inductor is a ferrite material, diameter 18mm, the no-load voltage ratio on former and deputy limit 1: 1, series resistance R1 is 10k Ω, and balance resistance R2 is 10k Ω, and the amplifier model is THS4001, output capacitance is a high pressure magnetic sheet electric capacity, 3300pF/2kV.Test result as shown in Figure 4.Reached purpose of design through experiment showed.
Claims (5)
1. a wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter is characterized in that, this filter comprises a passive common mode filter inductance (L
CM), this passive common mode filter inductance (L
CM) input and HF current transformer (L
CT) output be in series, constitute the hybrid filter of source filter and passive filter;
Passive common mode filter inductance (L
CM) the coiling direction of former and deputy limit winding identical, former and deputy limit winding respectively with the end of incoming cables of noise source equipment with being in series;
HF current transformer (L
CT) being wound with 3 windings respectively, 3 windings are the homophase coiling, and wherein 2 windings in series are to the output of impedance stable network (LISN), an end ground connection of another winding, the other end of this winding is by a series resistance (R
1) input of concatenation operation amplifier, another input of operational amplifier is by resistance (R
2) ground connection, the output of operational amplifier is connected to passive common mode inductance (L by 2 higfh-tension ceramics electric capacity with output signal
CM) input, the output of operational amplifier is also by resistance (R
3) ground connection.
2. wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter as claimed in claim 1 is characterized in that, described passive common mode filter inductance (L
CM) make by non-crystalline material.
3. wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter as claimed in claim 1 is characterized in that described operational amplifier is operated in open loop situations, promptly between the input of amplifier and the output without any electric connection.
4. wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter as claimed in claim 1 is characterized in that, the value of described 2 higfh-tension ceramics electric capacity is the pF order of magnitude.
5. wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter as claimed in claim 1 is characterized in that described bandwidth of operational amplifiers is not less than 50MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610042760A CN1851973B (en) | 2006-04-30 | 2006-04-30 | Wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610042760A CN1851973B (en) | 2006-04-30 | 2006-04-30 | Wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1851973A CN1851973A (en) | 2006-10-25 |
| CN1851973B true CN1851973B (en) | 2010-05-12 |
Family
ID=37133445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610042760A Expired - Fee Related CN1851973B (en) | 2006-04-30 | 2006-04-30 | Wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1851973B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3553935A4 (en) * | 2016-12-12 | 2019-12-04 | Mitsubishi Electric Corporation | Power conversion device |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427957C (en) * | 2006-11-28 | 2008-10-22 | 南京师范大学 | Device and method for measuring internal impedance of noise source of switch power supply EMI |
| CN101527505B (en) * | 2009-03-31 | 2012-05-23 | 西安交通大学 | Disturbance voltage attenuation device |
| EP2709250A1 (en) | 2012-09-13 | 2014-03-19 | Nxp B.V. | Noise filtering |
| US10097222B2 (en) * | 2016-10-28 | 2018-10-09 | Tektronix, Inc. | Variable passive network noise filter for noise reduction |
| US10374510B2 (en) * | 2017-04-07 | 2019-08-06 | Texas Instruments Incorporated | Compensated active electro-magnetic interference filters |
| CN108051671B (en) * | 2017-12-08 | 2022-12-13 | 中国核动力研究设计院 | Device and method for inhibiting power line conduction emission in wide frequency range |
| KR101945463B1 (en) * | 2018-05-02 | 2019-02-07 | 울산과학기술원 | A Transformer-Isolated Common-Mode Active EMI Filter without Additional Components on Power Line, and Method for reducing EMI noise using it |
| DE102018216594A1 (en) * | 2018-09-27 | 2020-04-02 | Zf Friedrichshafen Ag | Improvement of electromagnetic compatibility |
| CN109617391B (en) * | 2018-12-25 | 2020-08-18 | 西安理工大学 | Stepless controllable suppression capability switching power supply EMI filter and design method thereof |
| CN113625214B (en) * | 2021-08-10 | 2023-08-29 | 广东工业大学 | Magnetometer electromagnetic interference diagnosis filtering method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5530396A (en) * | 1994-09-19 | 1996-06-25 | Center For Innovative Technology | Damped EMI input filter power factor correction circuits |
| CN1274977A (en) * | 2000-06-16 | 2000-11-29 | 清华大学 | Combined power filter with both active and passive parts |
| CN1465130A (en) * | 2001-06-29 | 2003-12-31 | 薛承基 | Active common mode emi filter mitigating conducted electromagnetic interference |
| CN1527456A (en) * | 2003-09-25 | 2004-09-08 | �Ϻ���ͨ��ѧ | Parallel mixed power filter for electrified railway |
-
2006
- 2006-04-30 CN CN200610042760A patent/CN1851973B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5530396A (en) * | 1994-09-19 | 1996-06-25 | Center For Innovative Technology | Damped EMI input filter power factor correction circuits |
| CN1274977A (en) * | 2000-06-16 | 2000-11-29 | 清华大学 | Combined power filter with both active and passive parts |
| CN1465130A (en) * | 2001-06-29 | 2003-12-31 | 薛承基 | Active common mode emi filter mitigating conducted electromagnetic interference |
| CN1527456A (en) * | 2003-09-25 | 2004-09-08 | �Ϻ���ͨ��ѧ | Parallel mixed power filter for electrified railway |
Non-Patent Citations (2)
| Title |
|---|
| 段勇,王跃,符志平,杨君,王兆安.新型单相并联混合电力滤波器的研究.电工电能新技术23 1.2004,23(1),51-54. |
| 段勇,王跃,符志平,杨君,王兆安.新型单相并联混合电力滤波器的研究.电工电能新技术23 1.2004,23(1),51-54. * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3553935A4 (en) * | 2016-12-12 | 2019-12-04 | Mitsubishi Electric Corporation | Power conversion device |
| US10700625B2 (en) | 2016-12-12 | 2020-06-30 | Mitsubishi Electric Corporation | Power conversion device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1851973A (en) | 2006-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1851973B (en) | Wide-frequency-band high-attenuation common-mode conductive electromagnetic interference shunt mixed type wave filter | |
| CN100403633C (en) | High-attenuation ultra-small common mode conduction electromagnetic interference active filter | |
| CN105403759B (en) | For the leakage current detection circuit of ADC samplings | |
| CN109946506B (en) | Zero crossing detection system | |
| CN101846702A (en) | Inductive current detection circuit | |
| CN205210170U (en) | Supply hourglass current detection circuit of ADC sampling | |
| CN205566240U (en) | Multi -level filter | |
| CN202737546U (en) | RCC (Ringing Choke Converter) charger control circuit and charger used for capacitive touch panel mobile terminal | |
| CN103312135A (en) | Ripple-reducing noise-suppressing circuit used for adjustable precise direct current large current source and control method | |
| CN204349789U (en) | AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus | |
| CN203643515U (en) | Transient electromagnetic pulse electric field tester | |
| CN105743331A (en) | Switching tube driving circuit for dual-tube flyback topological switch power supply | |
| CN110571127A (en) | Radio frequency power supply for multipole ion trap and ion guide device | |
| CN103107795A (en) | Floating ground active inductor | |
| CN104883047A (en) | Common-mode and differential-mode current suppression circuit | |
| CN110729975B (en) | Magnetic coupling resonant wireless power transmission power amplifier system | |
| CN204290903U (en) | The filter circuit that belt switch exports | |
| Vedde et al. | Optimization of a passive common mode EMI filter by adding an active feedback loop | |
| CN206850431U (en) | A kind of plug and play integrated modular active harmonics isolator | |
| CN103560311A (en) | Miniaturization and high-stability radio-frequency signal output module | |
| CN214125518U (en) | High-impedance radio frequency microphone circuit system | |
| CN111464049B (en) | Power adapter with high conversion rate and low loss rectification filter circuit | |
| CN210867491U (en) | Filter circuit, switching power supply and air conditioner | |
| CN216051907U (en) | Conditioning circuit for eliminating interference birefringence of optical voltage transformer and optical voltage transformer thereof | |
| CN203225652U (en) | Circuit for reducing ripple waves and suppressing noise for adjustable precision direct current large current source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 |