CN1851973B - Broadband High Attenuation Common Mode Conducted Electromagnetic Interference Parallel Hybrid Filter - Google Patents
Broadband High Attenuation Common Mode Conducted Electromagnetic Interference Parallel Hybrid Filter Download PDFInfo
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- 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
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Abstract
本发明公开了一种宽频带高衰减共模传导电磁干扰并联混合型滤波器，包括无源共模滤波电感LCM，该无源共模滤波电感LCM的输入端与高频电流互感器LCT的输出端相串联，构成有源滤波器和无源滤波器；无源共模滤波电感与噪声源设备相串联，能够有效滤除高频电磁噪声又能够修正设备的源阻抗特性。运算放大器的输出通过2个高压陶瓷电容和电阻并联连接到小型无源共模电感的输入端，且工作在开环状态，其输入端经高频电流互感器串联连接到设备的电网侧。本发明优于构成它的单纯有源或无源滤波器，而且远大于有源与无源的滤波效果之和，其结构简单、合理，噪声衰减能力强、外形尺寸小、重量轻等特点。能够满足开关电源等电力电子设备的传导电磁干扰抑制。
The invention discloses a wide-band high-attenuation common-mode conduction electromagnetic interference parallel hybrid filter, which includes a passive common-mode filter inductor LCM, the input end of the passive common-mode filter inductor LCM and the output of a high-frequency current transformer LCT The terminals are connected in series to form an active filter and a passive filter; the passive common-mode filter inductor is connected in series with the noise source equipment, which can effectively filter out high-frequency electromagnetic noise and correct the source impedance characteristics of the equipment. The output of the operational amplifier is connected in parallel to the input of a small passive common-mode inductor through two high-voltage ceramic capacitors and resistors, and works in an open-loop state. Its input is connected in series to the power grid side of the equipment through a high-frequency current transformer. The present invention is superior to the simple active or passive filter that constitutes it, and is far greater than the sum of active and passive filtering effects. It has the characteristics of simple and reasonable structure, strong noise attenuation ability, small size and light weight. It can meet the conduction electromagnetic interference suppression of power electronic equipment such as switching power supply.
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 |
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| CN200610042760A CN1851973B (en) | 2006-04-30 | 2006-04-30 | Broadband High Attenuation Common Mode Conducted Electromagnetic Interference Parallel Hybrid Filter |
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| CN200610042760A CN1851973B (en) | 2006-04-30 | 2006-04-30 | Broadband High Attenuation Common Mode Conducted Electromagnetic Interference Parallel Hybrid Filter |
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| CN1851973A CN1851973A (en) | 2006-10-25 |
| CN1851973B true CN1851973B (en) | 2010-05-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3553935A4 (en) * | 2016-12-12 | 2019-12-04 | Mitsubishi Electric Corporation | CURRENT CONVERTING DEVICE |
Families Citing this family (13)
| 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 EMI noise source of switching power supply |
| 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 | A magnetometer electromagnetic interference diagnosis filtering method and system |
| CN115840087B (en) * | 2021-09-22 | 2025-05-23 | 中车株洲电力机车研究所有限公司 | Method for testing common-mode insertion loss of hybrid EMI filter and related equipment |
| CN114257241B (en) * | 2021-12-28 | 2025-04-25 | 芯聚威科技(成都)有限公司 | A common mode cancellation circuit for switched capacitor sampling circuit |
| CN118381315A (en) * | 2024-04-30 | 2024-07-23 | 洛坦电子科技(上海)有限公司 | Filtering device for power supply, vehicle-mounted charger and new energy electric automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3553935A4 (en) * | 2016-12-12 | 2019-12-04 | Mitsubishi Electric Corporation | CURRENT CONVERTING DEVICE |
| US10700625B2 (en) | 2016-12-12 | 2020-06-30 | Mitsubishi Electric Corporation | Power conversion device |
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| CN1851973A (en) | 2006-10-25 |
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