CN102307009A - EMI filter circuit - Google Patents
EMI filter circuit Download PDFInfo
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- CN102307009A CN102307009A CN201110194984A CN201110194984A CN102307009A CN 102307009 A CN102307009 A CN 102307009A CN 201110194984 A CN201110194984 A CN 201110194984A CN 201110194984 A CN201110194984 A CN 201110194984A CN 102307009 A CN102307009 A CN 102307009A
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Abstract
The invention relates to an EMI (Electro-Magnetic Interference) filter circuit, which belongs to the technical field of automatic control equipment in the power electronics field. A differential mode filter circuit of the circuit comprises a differential mode choke coil and a differential mode filter capacitor bank, and is used for filtering differential mode reference signal in the harmonic wave by a low-pass filter consisting of the differential mode choke coil and the differential mode filter capacitor bank; a common mode filter circuit comprises a common mode choke coil and a common mode filter capacitor bank, the midpoint of the common mode filter capacitor in the common mode filter capacitor bank is grounded, and the common filter circuit is used for filtering common mode reference signal in the harmonic wave. The EMI filter circuit increases the operation reliability of equipment, and further achieves the purposes of increasing the efficiency of surge absorption, miniaturization and lowering the cost.
Description
Technical field
The present invention relates to a kind of EMI filter circuit, belong to field of power electronics automation control appliance technical field.
Background technology
In recent years, along with the extensive use of electronic technology and large scale integrated circuit, electromagnetic interference and electromagnetic environment are increasingly sophisticated, and the Electromagnetic Compatibility of Power Electronics problem is more and more outstanding.Therefore, electronic equipment and automation control appliance with regard to the problem of needs consideration electromagnetic compatibility, are taken the concrete measures and are suppressed electromagnetic interference, with the safety and the reliability service of support equipment when design.The EMI filter circuit of the input in the tradition automation control appliance only occurs in the AC/DC converter usually; So that it is bigger with the radio frequency interference and the filter circuit volume of input power supply to isolate the AC electrical network; Used number of devices is more; Make oversized, the layout of main circuit board in disorder, the EMI filtration efficiency is low, the discreteness of system increases substantially, and finally causes the reliability of system significantly to reduce.
Summary of the invention
The invention provides and a kind ofly can realize miniaturization, low cost, high efficiency surging assimilation effect, satisfy the EMI filter circuit of the Electro Magnetic Compatibility demand under the complex working condition.
The objective of the invention is to realize through following technical scheme:
A kind of EMI filter circuit comprises:
The differential mode filter circuit comprises differential mode choke coil and differential mode filter capacitor group, and the low pass filter that is used for forming through differential mode choke coil and differential mode filter capacitor group is with the differential mode interference target signal filter of harmonic wave;
The common mode filtering circuit comprises common-mode choke coil and common mode filtering capacitance group, and the neutral earthing of the common mode filtering electric capacity in the said common mode filtering capacitance group is used for the common mode interference signal filtering with harmonic wave.
Can find out by the above-mentioned technical scheme that provides that the reliability in the equipment operation has been strengthened in the use of EMI filter circuit provided by the invention, thus the purpose that has further realized improving efficient that surging absorbs, miniaturization, reduced cost.
Description of drawings
The structural representation of the EMI filter circuit that Fig. 1 provides for the specific embodiment of the present invention;
The common mode EMI path of current sketch map that Fig. 2 provides for the specific embodiment of the present invention;
The differential mode EMI path of current sketch map that Fig. 3 provides for the specific embodiment of the present invention;
The electrical block diagram of the EMI filter circuit that Fig. 4 provides for the specific embodiment of the present invention;
The electrical block diagram of the EMI filter circuit of the increase pressure release resistance that Fig. 5 provides for the specific embodiment of the present invention.
Embodiment
This embodiment provides a kind of EMI filter circuit, as shown in Figure 1, comprising:
Differential mode filter circuit 1 comprises differential mode choke coil and differential mode filter capacitor group, and the low pass filter that is used for forming through differential mode choke coil and differential mode filter capacitor group is with the differential mode interference target signal filter of harmonic wave;
Common mode filtering circuit 2 comprises common-mode choke coil and common mode filtering capacitance group, and the neutral earthing of the common mode filtering electric capacity in the said common mode filtering capacitance group is used for the common mode interference signal filtering with harmonic wave.
Concrete, when frequency converter moved, common mode current path and differential-mode current path were as shown in Figures 2 and 3.Behind the EMI filter circuit that adds in the frequency converter as shown in Figure 4; When common mode disturbances occurs; The L1 common mode choke is because the flow direction of two coils is identical; The total inductance amount increases rapidly after overcoupling; Therefore common-mode signal is presented very big induction reactance; Make it to be difficult for passing through; Its two coils are respectively around low-loss; (common mode inductance with the nanometer crystal alloy manufacturing has very big impedance and inserts loss under downfield on the nanometer crystal alloy; Weak jamming had fabulous inhibitory action); When electric current passes through; Magnetic field on two coils will be strengthened mutually; And C7; C8; C9; Be connected across on the input three-phase; And, can suppress common mode disturbances effectively with the neutral earthing of capacitor.For reducing leakage current, capacitance generally must not surpass 0.1 μ F, and the capacitor mid point should be connected with the earth.C1, C2, C3, C4, C5, C6 are the differential mode filter capacitor, the peak voltage on can the filtering electrical network, and form a LC low pass filter with L2 differential mode choke, play the effect that suppresses differential mode interference.In Fig. 5, R1, R2, R3, R4, R5, R6 are bleeder resistance, the electric charge that accumulates on the filter capacitor can be bled off behind the power cut-off, make power input line not charged, guarantee safe in utilization.Parameter in the EMI filter circuit confirms according to the needed input current of frequency converter that mainly concrete data can be adjusted among a small circle, data are following: C1, C2, C3 are 1uf 275VAC; C4, C5, C6 are 0.47uf 275VAC; R1, R2, R3, R4, R5, R6 are 360K Ω 1/2W.
Existing 380V grade universal frequency converter generally adopts the PWM technology, when it works in switching mode and does to switch at a high speed, can produce a large amount of coupling noises.The rectifier bridge of frequency converter is nonlinear load concerning electrical network, and the harmonic wave that it produced can produce Harmonic Interference to other electronics, the electric equipment of same electrical network.On the other hand, the Harmonic Interference in the electrical network is mainly disturbed frequency converter through the power supply of frequency converter.There are a large amount of harmonic sources (like various rectifying installations, alternating current-direct current switchgear, electronic voltage adjustment equipment, nonlinear load and lighting apparatus etc.) in the electrical network; These loads all make voltage, the electric current in the electrical network produce wave distortion, thereby other equipment in the electrical network are produced interference.After the power supply of frequency converter received the interference from contaminated AC network, if do not add processing, electric network noise can disturb frequency converter through the electric network source circuit.The interference that causes to frequency converter mainly contains overvoltage, under-voltage, instantaneous power-down, surge, fall, the peak voltage pulse, radio frequency interference.Secondly, common mode disturbances also can be disturbed the operate as normal of frequency converter through the control signal wire of frequency converter.When above-mentioned situation occurring, the EMI filter circuit that adopts this embodiment to provide just can solve the relevant interference problem, thereby frequency converter can normally be moved.
Use the frequency converter electromagnetic compatibility test result of the EMI filter circuit that this embodiment provides following:
Do not use the frequency converter electromagnetic compatibility test result of the EMI filter circuit that this embodiment provides following:
The technical scheme that adopts this embodiment to provide; Through effective design; Make the PCB layout more reasonable; Effectively improved complete machine Electro Magnetic Compatibility, improved competitiveness of product; Also strengthened the reliability in the equipment operation simultaneously, thus the purpose that has further realized improving efficient that surging absorbs, miniaturization, reduced cost.
The above; Only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (2)
1. an EMI filter circuit is characterized in that, comprising:
The differential mode filter circuit comprises differential mode choke coil and differential mode filter capacitor group, and the low pass filter that is used for forming through differential mode choke coil and differential mode filter capacitor group is with the differential mode interference target signal filter of harmonic wave;
The common mode filtering circuit comprises common-mode choke coil and common mode filtering capacitance group, and the neutral earthing of the common mode filtering electric capacity in the said common mode filtering capacitance group is used for the common mode interference signal filtering with harmonic wave.
2. EMI filter circuit according to claim 1 is characterized in that, said differential mode filter capacitor group also comprises bleeder resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110194984A CN102307009A (en) | 2011-07-11 | 2011-07-11 | EMI filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110194984A CN102307009A (en) | 2011-07-11 | 2011-07-11 | EMI filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102307009A true CN102307009A (en) | 2012-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110194984A Pending CN102307009A (en) | 2011-07-11 | 2011-07-11 | EMI filter circuit |
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| CN (1) | CN102307009A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594120A (en) * | 2012-01-30 | 2012-07-18 | 苏州腾冉电气设备有限公司 | High-power EMI (Electromagnetic Interference) filter |
| CN102931817A (en) * | 2012-10-23 | 2013-02-13 | 华为技术有限公司 | Three-phase alternating converter for tri-state switch unit |
| CN104113203A (en) * | 2014-07-17 | 2014-10-22 | 山东超越数控电子有限公司 | Method for locating EMI (Electromagnetic Interference) noise of switch power supply rapidly |
| US9203298B2 (en) | 2012-10-23 | 2015-12-01 | Huawei Technologies Co., Ltd. | Three-phase interleave converter with three-state switching cell |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2482269Y (en) * | 2000-12-28 | 2002-03-13 | 深圳市中兴通讯股份有限公司 | Three-phase input filter unit for switch power supply |
| US20080143432A1 (en) * | 2005-02-09 | 2008-06-19 | Roland Kuepfer | Active emc filter for machine tools |
-
2011
- 2011-07-11 CN CN201110194984A patent/CN102307009A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2482269Y (en) * | 2000-12-28 | 2002-03-13 | 深圳市中兴通讯股份有限公司 | Three-phase input filter unit for switch power supply |
| US20080143432A1 (en) * | 2005-02-09 | 2008-06-19 | Roland Kuepfer | Active emc filter for machine tools |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594120A (en) * | 2012-01-30 | 2012-07-18 | 苏州腾冉电气设备有限公司 | High-power EMI (Electromagnetic Interference) filter |
| CN102594120B (en) * | 2012-01-30 | 2016-05-25 | 苏州腾冉电气设备有限公司 | High-power electromagnetic interface filter |
| CN102931817A (en) * | 2012-10-23 | 2013-02-13 | 华为技术有限公司 | Three-phase alternating converter for tri-state switch unit |
| WO2014063478A1 (en) * | 2012-10-23 | 2014-05-01 | 华为技术有限公司 | Three-phase alternating converter for tri-state switch unit |
| US9203298B2 (en) | 2012-10-23 | 2015-12-01 | Huawei Technologies Co., Ltd. | Three-phase interleave converter with three-state switching cell |
| CN102931817B (en) * | 2012-10-23 | 2016-03-09 | 华为技术有限公司 | A kind of tri-state switch unit three-phase interleaved converter |
| CN104113203A (en) * | 2014-07-17 | 2014-10-22 | 山东超越数控电子有限公司 | Method for locating EMI (Electromagnetic Interference) noise of switch power supply rapidly |
| CN104113203B (en) * | 2014-07-17 | 2016-06-08 | 山东超越数控电子有限公司 | A kind of method for quick position switch power supply EMI noise |
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Application publication date: 20120104 |