CN1866703A - High-attenuation ultra-small common mode conduction electromagnetic interference active filter - Google Patents
High-attenuation ultra-small common mode conduction electromagnetic interference active filter Download PDFInfo
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- CN1866703A CN1866703A CN 200610042743 CN200610042743A CN1866703A CN 1866703 A CN1866703 A CN 1866703A CN 200610042743 CN200610042743 CN 200610042743 CN 200610042743 A CN200610042743 A CN 200610042743A CN 1866703 A CN1866703 A CN 1866703A
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- electromagnetic interference
- common mode
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Abstract
The invention discloses a high attenuation microminiaturte common mode transmission electromagnetic interference active filter, which includes ring high-frequency current-transformer, wherein three windings twine round the mutual-inductor; the coiling directions of three windings are the same; two windings connect the alternating current power lead-in end; another end connects the carry-in terminal of operational amplifier; the export of operational amplifier feedbacks signal to noise source device by two high-pressure capacitances and electric resistances. The filter has simple and reasonable structure, which has strong noise attenuation ability and good low-frequency filtering feature.
Description
Technical field
The invention belongs to the production and the application of Electromagnetic interference filter, relate to the active Electromagnetic interference filter of the high attenuation multiple of a kind of miniaturization.
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, and filter effect is not good enough, and designs and produces the process complexity, is easy to generate resonance.According to the data-searching that the applicant carried out, the at present product and the relevant report of the electromagnetic interface filter that does not also constitute by active elements such as operational amplifiers.
Summary of the invention
The objective of the invention is to, a kind of Electromagnetic interference filter based on active element is provided, traditional relatively passive electromagnetic interface filter, it is stronger that this filter has the noise attentuation ability, the advantage that overall dimension is littler, the Conducted Electromagnetic Interference that is specially adapted to power electronic equipments such as Switching Power Supply suppresses.
The technical solution that realizes above-mentioned purpose is: a kind of active Electromagnetic interference filter, it is characterized in that, this filter comprises annular HF current transformer, be wound with 3 windings on the instrument transformer circumference respectively, the coiling direction of 3 windings is homophase, 2 windings wherein are connected in series to the input live wire and the zero line side of equipment successively respectively, another winding is linked to the input of operational amplifier by a resistance string, and the output of operational amplifier is parallel to output signal respectively the live wire and the zero line side of electrical network by 2 higfh-tension ceramics electric capacity and resistance.
Active Electromagnetic interference filter of the present invention owing to adopted HF current transformer, has not only realized the accurate detection of HF noise signal but also has effectively rejected the fundamental frequency signal.Adopted high-speed wideband current mode operational amplifier simultaneously, greatly improved dynamic response and the frequency response ability of filter interference signal.Adopt higfh-tension ceramics electric capacity at output, overcome of the influence of grid side high pressure, realized the automatic feedback of noise signal simultaneously operational amplifier.This filter has that circuit structure is simple, design is convenient, volume is little, in light weight, the noise attentuation ability is strong, to characteristics such as the low frequency signal filter effect are especially obvious, the Conducted Electromagnetic Interference that is specially adapted to power electronic equipments such as Switching Power Supply suppresses.
Description of drawings
Fig. 1 is an electromagnetic interference active filter circuit structure schematic diagram of the present invention;
Fig. 2 is an electromagnetic interference active filter actual device structure photo of the present invention;
Fig. 3 is the experimental result of electromagnetic interference active filter 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, common mode electromagnetic interference active filter of the present invention, comprise high frequency common mode electromagnetic interference current transformer, be wound with 3 windings on the circumference of instrument transformer, the coiling direction of 3 windings is homophase, and wherein 2 windings are connected in series to the interchange inlet wire of noise power-supply device, i.e. live wire and zero line respectively, another winding is connected to the input (negative terminal) of operational amplifier A by series resistance R1, and the input of operational amplifier A also has a resistance R 2 (anode).Operational amplifier A is operated in open loop situations, and its output is connected with 2 higfh-tension ceramics capacitor C 1 and C2 and a resistance R 3, and higfh-tension ceramics capacitor C 1 and C2 are parallel-connected to output signal respectively the live wire and the zero line side of noise source equipment inlet wire.
The high frequency common mode current mutual inductor serial is in AC network, high frequency common mode disturbance current signal that can the detection noise source device.Because 3 windings all adopt the homophase coiling, so the common mode interference signal of the electrical network of only taking a sample does not then process for differential mode noise.The cut-off frequency of instrument transformer is determined by formula (1):
In the formula, n is the no-load voltage ratio of former secondary winding, μ
0Be permeability of vacuum, μ
rBe the magnetic permeability of core material, A
eBe the cross-sectional area of magnetic core, l is the effective length of magnetic core, and R is the equiva lent impedance of secondary.In order to improve the noise signal sampling precision of instrument transformer, should make cut-off frequency low as far as possible, to obtain the noise information in the more abundant more broad frequency range.
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.
Amplify voltage signal afterwards through operational amplifier and refill electrical network by electric capacity at last.Because there is the 220V power frequency high voltage in the interchange end of incoming cables of equipment, therefore, feedback electric capacity must be selected high voltage bearing ceramic condenser.Simultaneously, excessive for fear of the leakage current between live wire and the zero line, the value of electric capacity also be difficult for to be selected excessive, generally just enough at the pF order of magnitude, two electric capacity that present embodiment adopts be 4700pF, the value withstand voltage is 2kV.
The photo of the active Electromagnetic interference filter that the inventor finishes by technique scheme as shown in Figure 2.Its overall dimensions: 43mm * 22mm, instrument transformer are ferrite material, diameter 18mm, the no-load voltage ratio of former secondary 1: 1, series resistance R1 is 10k Ω, balance resistance R2 is 10k Ω, the amplifier model is THS4001, and output capacitance is a high pressure magnetic sheet electric capacity, 4700pF/2kV.Test result as shown in Figure 3.Reached purpose of design through experiment showed.
Claims (5)
1. high-attenuation ultra-small common mode conduction electromagnetic interference active filter, it is characterized in that, this filter comprises annular HF current transformer, be wound with 3 windings on the instrument transformer circumference respectively, the coiling direction of 3 windings is homophase, 2 windings wherein are connected in series to the input live wire and the zero line side of equipment successively respectively, another winding is linked to the input of operational amplifier by a resistance string, and the output of operational amplifier is parallel to output signal respectively the live wire and the zero line side of electrical network by 2 higfh-tension ceramics electric capacity and resistance.
2. high-attenuation ultra-small common mode conduction electromagnetic interference active 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.
3. high-attenuation ultra-small common mode conduction electromagnetic interference active filter as claimed in claim 1 is characterized in that, described HF current transformer is in close AC power end of incoming cables one side, and connected mode is for being connected in series; High-voltage capacitance is in close noise source equipment one side, and connected mode is for being connected in parallel.
4. high-attenuation ultra-small common mode conduction electromagnetic interference active 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. high-attenuation ultra-small common mode conduction electromagnetic interference active 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 |
|---|---|---|---|
| CNB2006100427430A CN100403633C (en) | 2006-04-27 | 2006-04-27 | High-attenuation ultra-small common mode conduction electromagnetic interference active filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100427430A CN100403633C (en) | 2006-04-27 | 2006-04-27 | High-attenuation ultra-small common mode conduction electromagnetic interference active filter |
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| CN1866703A true CN1866703A (en) | 2006-11-22 |
| CN100403633C CN100403633C (en) | 2008-07-16 |
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Cited By (8)
| 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 |
| CN102256194A (en) * | 2011-06-23 | 2011-11-23 | 胡国强 | Sound device with alternating current filter |
| CN101527505B (en) * | 2009-03-31 | 2012-05-23 | 西安交通大学 | Disturbance voltage attenuation device |
| CN102844975A (en) * | 2010-04-05 | 2012-12-26 | 三菱电机株式会社 | Leakage current reducing device |
| CN107147280A (en) * | 2017-06-21 | 2017-09-08 | 山东超越数控电子有限公司 | A kind of support plate design method of improvement DC DC switch power supply EMIs |
| CN108696117A (en) * | 2017-04-07 | 2018-10-23 | 德州仪器公司 | Compensation active Electromagnetic interference filter |
| CN109155596A (en) * | 2016-04-18 | 2019-01-04 | 株式会社丰田自动织机 | Motor drive |
| CN109617391A (en) * | 2018-12-25 | 2019-04-12 | 西安理工大学 | The switch power supply EMI filter and its design method of stepless controllable rejection ability |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022016395A1 (en) * | 2020-07-21 | 2022-01-27 | AnApp Technologies Limited | Electromagnetic interference suppression circuit and related sensing circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001244770A (en) * | 2000-12-27 | 2001-09-07 | Mitsubishi Electric Corp | Noise filter |
| CN1282407C (en) * | 2001-02-14 | 2006-10-25 | 神达电脑股份有限公司 | Filter of electromagnetic interference |
| US6781444B2 (en) * | 2002-05-22 | 2004-08-24 | International Rectifier Corporation | Active common mode EMI filter, including series cascaded filter with reduced power dissipation and transistor voltage rating |
| CN2709989Y (en) * | 2004-07-24 | 2005-07-13 | 刘新普 | 220V. AC. power-supply fastening signal isolator |
-
2006
- 2006-04-27 CN CNB2006100427430A patent/CN100403633C/en active Active
Cited By (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 |
| CN102844975A (en) * | 2010-04-05 | 2012-12-26 | 三菱电机株式会社 | Leakage current reducing device |
| CN102844975B (en) * | 2010-04-05 | 2015-10-21 | 三菱电机株式会社 | Leakage current reduces device |
| CN102256194A (en) * | 2011-06-23 | 2011-11-23 | 胡国强 | Sound device with alternating current filter |
| CN109155596A (en) * | 2016-04-18 | 2019-01-04 | 株式会社丰田自动织机 | Motor drive |
| CN108696117A (en) * | 2017-04-07 | 2018-10-23 | 德州仪器公司 | Compensation active Electromagnetic interference filter |
| CN108696117B (en) * | 2017-04-07 | 2022-04-12 | 德州仪器公司 | Compensation type active electromagnetic interference filter |
| CN107147280A (en) * | 2017-06-21 | 2017-09-08 | 山东超越数控电子有限公司 | A kind of support plate design method of improvement DC DC switch power supply EMIs |
| CN109617391A (en) * | 2018-12-25 | 2019-04-12 | 西安理工大学 | The switch power supply EMI filter and its design method of stepless controllable rejection ability |
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| Publication number | Publication date |
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| CN100403633C (en) | 2008-07-16 |
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