CN102386760A - Frequency converter multistage EMI (electromagnetic interference) filter circuit - Google Patents
Frequency converter multistage EMI (electromagnetic interference) filter circuit Download PDFInfo
- Publication number
- CN102386760A CN102386760A CN2011103734658A CN201110373465A CN102386760A CN 102386760 A CN102386760 A CN 102386760A CN 2011103734658 A CN2011103734658 A CN 2011103734658A CN 201110373465 A CN201110373465 A CN 201110373465A CN 102386760 A CN102386760 A CN 102386760A
- Authority
- CN
- China
- Prior art keywords
- differential mode
- common mode
- capacitor
- direct current
- phase
- 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.)
- Pending
Links
Images
Landscapes
- Power Conversion In General (AREA)
Abstract
The invention provides a frequency converter multistage EMI (electromagnetic interference) filter circuit. The filter circuit is arranged on a three-phase input line and a direct current bus which are connected with a load by virtue of a rectifying circuit in a three-phase power grid and comprises a three-phase common mode inductor, a differential mode filter capacitor, a common mode capacitor, a direct current mutual inductor, a direct current bus support capacitor and a second order differential mode capacitor. A manner that an alternating current side and a direct current side are matched is adopted to form the multistage filter circuit, and the problems that a filter is heavy and the adaptability to a load is poor can be effectively solved.
Description
Technical field
The invention belongs to the electromagnetic compatibility field, be specifically related to the multistage EMI of a kind of frequency converter (Electromagnetic Interference, electromagnetic interference) filter circuit.
Background technology
Because the main devices of frequency converter is a power semiconductor; Like IGBT, diode, thyristor etc.; And these devices all are operated on off state; Very high
and
can be produced thereby formation DM EMI and common mode disturbances, i.e. EMI.General, along with the increase of transducer power, EMI disturbs and can strengthen thereupon.Along with countries in the world are more and more stricter to the EMI restriction, the effect of EMI filter circuit in frequency converter is more and more important.Frequency converter on the market generally is confined to the interchange input side of frequency converter to the design of EMI filter circuit now; Means relatively more commonly used are on inlet wire, to add X electric capacity or simple differential mode of Y electric capacity inlet wire or common mode filtering; What have also can add a common mode inductance, constitutes a two-stage filtering with Y electric capacity.This one-level or two-stage filtering as to reach filter effect preferably must with the value of common mode inductance or electric capacity get very big, does like this and can cause the excessive or leakage current of filter circuit volume to exceed standard, and it is very poor to the adaptability of electrical network and interference source impedance.
Summary of the invention
The technical problem that the present invention will solve is: provide a kind of frequency converter multistage EMI filter circuit, can solve the filtering device heaviness effectively, to the problem of workload-adaptability difference.
The present invention solves the problems of the technologies described above the technical scheme of being taked to be: the multistage EMI filter circuit of a kind of frequency converter; Be arranged on the three-phase incoming line and dc bus that three phase network is connected with load through rectification circuit, it is characterized in that: be connected in series the three-phase common mode inductance between three phase network and the rectification circuit;
Before the three-phase common mode inductance, connect three differential mode filter capacitors, three differential mode filter capacitors are connected between the three-phase incoming line with star-like ways of connecting, and differential mode filter capacitor and three-phase common mode inductance constitute the differential mode filter circuit;
Behind the three-phase common mode inductance, connect three differential mode capacitors and a common mode capacitance; Three differential mode capacitors are connected between the three-phase incoming line with star-like ways of connecting; Its neutral point is through above-mentioned common mode capacitance ground connection; The while common mode capacitance is resistance of parallel connection also, and three-phase common mode inductance, three differential mode capacitors and a common mode capacitance constitute differential mode common mode mixed filtering circuit;
Be connected direct current reactor on the dc bus between rectification circuit and the load, direct current reactor has two coils of magnetic cores altogether, and is connected on respectively on the positive and negative dc bus, and the end of the same name of coil is connected with the electric current input direction;
Positive and negative dc bus behind the direct current reactor is respectively through a direct current common mode capacitance ground connection, and direct current common mode capacitance and direct current reactor constitute direct current common mode filtering circuit;
Connect dc bus between the positive and negative dc bus behind the direct current reactor respectively and support electric capacity and second order differential mode capacitor, direct current reactor, dc bus support electric capacity and the second order differential mode capacitor constitutes second order differential mode filter circuit.
Press such scheme, described differential mode filter capacitor, differential mode capacitor and common mode capacitance are metallized film capacitor.
Press such scheme, each respectively parallelly connected little differential mode capacitor of described three differential mode capacitors, the capacitance of little differential mode capacitor is less than differential mode capacitor.
Press such scheme, described differential mode capacitor is worth big 2 one magnitude than the appearance of little differential mode capacitor.
Press such scheme, the span of described resistance is 10-100k Ω.
Beneficial effect of the present invention is: the present invention is arranged on the three-phase incoming line and dc bus that three phase network is connected with load through rectification circuit; The mode that adopts AC side and DC side to cooperate; Constitute multi-stage filter circuit; Can solve the filtering device heaviness effectively, to the problem of workload-adaptability difference.
Description of drawings
Fig. 1 is the circuit theory diagrams of one embodiment of the invention.
Embodiment
Fig. 1 is the circuit theory diagrams of one embodiment of the invention, comprises that three-phase common mode inductance, differential mode filter capacitor, differential mode capacitor, common mode capacitance, direct current instrument transformer, dc bus support electric capacity and second order differential mode capacitor.Rectification circuit Q1 in the present embodiment is that three-phase is not controlled rectifier bridge.
Between three phase network and rectification circuit Q1, be connected in series three-phase common mode inductance L1, the magnetic material that adopts ferrite or other to have good high frequency constitutes, and its effect is to cut off three phase network and frequency converter common mode disturbances each other.
Before three-phase common mode inductance L1, connect three differential mode filter capacitor C1, C2, C3 formation differential mode filter circuit, three differential mode filter capacitor C1, C2, C3 are connected between the three-phase incoming line with star-like ways of connecting.The differential mode filter circuit will guarantee that follow-up converter circuit does not receive the interference of electrical network from the DM EMI filtering of electrical network.
Behind three-phase common mode inductance L1, connect differential mode capacitor and common mode capacitance and constitute differential mode common mode mixed filtering circuit.Three differential mode capacitor C4, C6, C8 are connected between the three-phase incoming line with star-like ways of connecting, and its neutral point is again through a common mode capacitance C10 ground connection, and while common mode capacitance C10 is the resistance R 1 of one tens k of parallel connection also; Three each respectively parallelly connected little differential mode capacitors of differential mode capacitor, promptly C4 is parallelly connected with C5, C6 is parallelly connected with C7, C8 is parallelly connected with C9.The value of these 6 electric capacity is different; Can make C4=C6=C8＞C5=C7=C9; Wherein C4 is than high two one magnitude of C5, and the purpose of doing like this is to utilize effective filtering frequency range difference of the metallic film electric capacity of different appearance values, guarantees that filter circuit is effective in the filter range of examination.These three pairs of electric capacity adopt star-like connected mode equally then, and their main effect is the DM EMI of filtering from frequency converter inside, in order to avoid frequency converter causes EMI to disturb to electrical network.C10 is connected on the neutral point of three pairs of electric capacity, is equivalent to the series connection with capacitor C 4-C9, constitutes the common mode filtering circuit.Because neutral point current potential and the electrical network of capacitor C 4-C9 are similar at low frequency end,, and can not cause the excessive problem of leakage current so the value of C10 can be a lot of greatly with traditional common mode capacitance.
For the electrical network common mode disturbances, L1 and C4-C10 constitute a LC second order common mode filtering circuit; For the frequency converter common mode disturbances, L1 and C4-C10 constitute a CL second order common mode filtering circuit.
Be connected the direct current reactor L2 that is used to improve the rectified power factor on the dc bus between rectification circuit Q1 and the load; The magnetic core of this direct current reactor adopts high-frequency magnetic material to process; Direct current reactor L2 has two coils of magnetic core altogether; And be connected on respectively on the positive and negative dc bus, the end of the same name of coil is connected with the electric current input direction; Positive and negative dc bus behind the direct current reactor L2 is respectively through a direct current common mode capacitance C13, C14 ground connection, and direct current common mode capacitance C13, C14 and direct current reactor L2 constitute direct current common mode filtering circuit.Direct current reactor L2 and the dc bus that is connected between the positive and negative dc bus support second order differential mode filter circuit of capacitor C 11 and second order differential mode capacitor C12 formation; C11 is an alminium electrolytic condenser in the present embodiment; C12 is a thin-film capacitor; Wherein the low frequency performance of C11 is good, and high band does not have effect basically, and C12 remedies the effect of C11 at high frequency.
Simultaneously, direct current reactor L2 in the winding process through control technology, with leakage inductance do a little bigger a little, like this leakage inductance of L2 respectively with C13, C14 formation LC common mode filtering circuit, their effect is the common mode disturbances of filtering from the follow-up motor side of frequency converter.
Claims (5)
1. multistage EMI filter circuit of frequency converter is arranged on the three-phase incoming line and dc bus that three phase network is connected with load through rectification circuit, it is characterized in that: be connected in series the three-phase common mode inductance between three phase network and the rectification circuit;
Before the three-phase common mode inductance, connect three differential mode filter capacitors, three differential mode filter capacitors are connected between the three-phase incoming line with star-like ways of connecting, and differential mode filter capacitor and three-phase common mode inductance constitute the differential mode filter circuit;
Behind the three-phase common mode inductance, connect three differential mode capacitors and a common mode capacitance; Three differential mode capacitors are connected between the three-phase incoming line with star-like ways of connecting; Its neutral point is through above-mentioned common mode capacitance ground connection; The while common mode capacitance is resistance of parallel connection also, and three-phase common mode inductance, three differential mode capacitors and a common mode capacitance constitute differential mode common mode mixed filtering circuit;
Be connected direct current reactor on the dc bus between rectification circuit and the load, direct current reactor has two coils of magnetic cores altogether, and is connected on respectively on the positive and negative dc bus, and the end of the same name of coil is connected with the electric current input direction;
Positive and negative dc bus behind the direct current reactor is respectively through a direct current common mode capacitance ground connection, and direct current common mode capacitance and direct current reactor constitute direct current common mode filtering circuit;
Connect dc bus between the positive and negative dc bus behind the direct current reactor respectively and support electric capacity and second order differential mode capacitor, direct current reactor, dc bus support electric capacity and the second order differential mode capacitor constitutes second order differential mode filter circuit.
2. the multistage EMI filter circuit of frequency converter according to claim 1 is characterized in that: described differential mode filter capacitor, differential mode capacitor and common mode capacitance are metallized film capacitor.
3. the multistage EMI filter circuit of frequency converter according to claim 1 is characterized in that: each respectively parallelly connected little differential mode capacitor of described three differential mode capacitors, the capacitance of little differential mode capacitor is less than differential mode capacitor.
4. the multistage EMI filter circuit of frequency converter according to claim 3 is characterized in that: described differential mode capacitor is worth big 2 one magnitude than the appearance of little differential mode capacitor.
5. the multistage EMI filter circuit of frequency converter according to claim 1 is characterized in that: the span of described resistance is 10-100
.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103734658A CN102386760A (en) | 2011-11-22 | 2011-11-22 | Frequency converter multistage EMI (electromagnetic interference) filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103734658A CN102386760A (en) | 2011-11-22 | 2011-11-22 | Frequency converter multistage EMI (electromagnetic interference) filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102386760A true CN102386760A (en) | 2012-03-21 |
Family
ID=45825839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103734658A Pending CN102386760A (en) | 2011-11-22 | 2011-11-22 | Frequency converter multistage EMI (electromagnetic interference) filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102386760A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095122A (en) * | 2013-02-26 | 2013-05-08 | 广东工业大学 | Electro-magnetic interference (EMI) filter used for three-phase three-level three-switch power factor correction (PFC) circuit |
| CN103516183A (en) * | 2013-09-30 | 2014-01-15 | 无锡洲翔成套焊接设备有限公司 | Spraying power supply three-phase filter |
| CN103944413A (en) * | 2014-05-08 | 2014-07-23 | 台州市恒智起重科技有限公司 | Frequency converter main loop circuit with efficient filter capacity |
| CN104638907A (en) * | 2015-02-11 | 2015-05-20 | 深圳市振邦智能科技有限公司 | Circuit for improving EMI (Electro Magnetic Interference) of refrigerator with inverter |
| CN107196494A (en) * | 2017-06-16 | 2017-09-22 | 上海辛格林纳新时达电机有限公司 | Leakage current absorption plant and application of frequency converter system in a kind of frequency convertor system |
| CN107819397A (en) * | 2017-12-06 | 2018-03-20 | 浙江大学 | Input filter and its method to set up include the frequency converter of the input filter |
| CN108450038A (en) * | 2015-07-23 | 2018-08-24 | 比厄吉特·施多克 | Filter circuit for the neutral conductor currents compensation in energy network |
| CN108829965A (en) * | 2018-06-07 | 2018-11-16 | 深圳大学 | Design method, system, equipment and the storage medium of EMI FILTER |
| CN111181413A (en) * | 2018-11-13 | 2020-05-19 | 罗克韦尔自动化技术公司 | Power conversion system and filter for the same |
| CN112039357A (en) * | 2019-06-04 | 2020-12-04 | 四川长江飞瑞能源科技有限公司 | Solar photovoltaic power generation pumping irrigation off-grid boosting and voltage reducing transmission control system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5646498A (en) * | 1995-08-07 | 1997-07-08 | Eaton Corporation | Conducted emission radiation suppression in inverter drives |
| US20020070821A1 (en) * | 2000-12-07 | 2002-06-13 | Henry Moller | RFI filter for a frequency converter |
| KR20050007860A (en) * | 2003-07-11 | 2005-01-21 | 최세완 | Active High Power Factor Diode Rectifier System |
| CN201138785Y (en) * | 2007-11-29 | 2008-10-22 | 上海美多通信设备有限公司 | Wave filter circuit for switch power supply |
| US20110049991A1 (en) * | 2009-03-05 | 2011-03-03 | Toshiba Mitsubishi-Electric Indus. Sys. Corp. | Uninterruptible power supply apparatus |
| CN202334291U (en) * | 2011-11-22 | 2012-07-11 | 中冶南方（武汉）自动化有限公司 | Multi-stage EMI (electromagnetic interference) filter circuit of inverter |
-
2011
- 2011-11-22 CN CN2011103734658A patent/CN102386760A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5646498A (en) * | 1995-08-07 | 1997-07-08 | Eaton Corporation | Conducted emission radiation suppression in inverter drives |
| US20020070821A1 (en) * | 2000-12-07 | 2002-06-13 | Henry Moller | RFI filter for a frequency converter |
| KR20050007860A (en) * | 2003-07-11 | 2005-01-21 | 최세완 | Active High Power Factor Diode Rectifier System |
| CN201138785Y (en) * | 2007-11-29 | 2008-10-22 | 上海美多通信设备有限公司 | Wave filter circuit for switch power supply |
| US20110049991A1 (en) * | 2009-03-05 | 2011-03-03 | Toshiba Mitsubishi-Electric Indus. Sys. Corp. | Uninterruptible power supply apparatus |
| CN202334291U (en) * | 2011-11-22 | 2012-07-11 | 中冶南方（武汉）自动化有限公司 | Multi-stage EMI (electromagnetic interference) filter circuit of inverter |
Non-Patent Citations (1)
| Title |
|---|
| 张小林等: "DC/ DC电源中的电磁干扰及其对策", 《微电子学》 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095122A (en) * | 2013-02-26 | 2013-05-08 | 广东工业大学 | Electro-magnetic interference (EMI) filter used for three-phase three-level three-switch power factor correction (PFC) circuit |
| CN103516183A (en) * | 2013-09-30 | 2014-01-15 | 无锡洲翔成套焊接设备有限公司 | Spraying power supply three-phase filter |
| CN103944413A (en) * | 2014-05-08 | 2014-07-23 | 台州市恒智起重科技有限公司 | Frequency converter main loop circuit with efficient filter capacity |
| CN104638907A (en) * | 2015-02-11 | 2015-05-20 | 深圳市振邦智能科技有限公司 | Circuit for improving EMI (Electro Magnetic Interference) of refrigerator with inverter |
| CN108450038A (en) * | 2015-07-23 | 2018-08-24 | 比厄吉特·施多克 | Filter circuit for the neutral conductor currents compensation in energy network |
| CN108450038B (en) * | 2015-07-23 | 2022-04-05 | 比厄吉特·施多克 | Filter circuit for neutral conductor current compensation in energy networks |
| CN107196494A (en) * | 2017-06-16 | 2017-09-22 | 上海辛格林纳新时达电机有限公司 | Leakage current absorption plant and application of frequency converter system in a kind of frequency convertor system |
| CN107819397A (en) * | 2017-12-06 | 2018-03-20 | 浙江大学 | Input filter and its method to set up include the frequency converter of the input filter |
| CN107819397B (en) * | 2017-12-06 | 2023-11-28 | 浙江大学 | Input filter, setting method thereof and frequency converter comprising input filter |
| CN108829965A (en) * | 2018-06-07 | 2018-11-16 | 深圳大学 | Design method, system, equipment and the storage medium of EMI FILTER |
| CN108829965B (en) * | 2018-06-07 | 2022-03-15 | 深圳大学 | Method, system, device and storage medium for designing electromagnetic interference filter |
| CN111181413A (en) * | 2018-11-13 | 2020-05-19 | 罗克韦尔自动化技术公司 | Power conversion system and filter for the same |
| CN111181413B (en) * | 2018-11-13 | 2023-11-24 | 罗克韦尔自动化技术公司 | Power conversion system and filter for the same |
| CN112039357A (en) * | 2019-06-04 | 2020-12-04 | 四川长江飞瑞能源科技有限公司 | Solar photovoltaic power generation pumping irrigation off-grid boosting and voltage reducing transmission control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102386760A (en) | Frequency converter multistage EMI (electromagnetic interference) filter circuit | |
| US9312753B2 (en) | Power converter with low common mode noise | |
| CN104205601B (en) | Circuit structure and arrangement structure of capacitors | |
| EP2876794B1 (en) | Input EMI filter and method for motor drive including an active rectifier | |
| CN102044961A (en) | Circuit for eliminating noise of switching power supply | |
| CN102938608B (en) | Passive component integrated device of power-factor correction circuit | |
| CN110212784B (en) | Passive element integration device for single-phase three-level AC/DC resonant converter | |
| CN104466969B (en) | A kind of LCL type wave filter based on three-winding transformer | |
| CN104410257B (en) | A kind of passive element integrating device of LCL filter | |
| CN101192791B (en) | EMC common mode filtering circuit | |
| CN202334291U (en) | Multi-stage EMI (electromagnetic interference) filter circuit of inverter | |
| CN101860193B (en) | Power factor correction circuit | |
| CN105958809A (en) | Filter with coupled inductor and parameter determining method of filter | |
| CN103856176B (en) | Adopt the LCL filter of coupling inductance | |
| CN209516921U (en) | The common-mode interference suppression circuit of air-conditioning | |
| CN103247984A (en) | DC (Direct-Current) common-mode busbar integrated with EMI (Electromagnetic Interference) filtering function | |
| CN104953591A (en) | LLCL type filter based on three-winding transformer | |
| CN202996476U (en) | Stacked staggered winding based planar EMI (electro-magnetic interference) filter | |
| CN102307009A (en) | EMI filter circuit | |
| CN201893695U (en) | Noise elimination circuit of switching power supply | |
| CN209516920U (en) | Inhibit the air-conditioning frequency conversion system of common mode interference | |
| CN203537229U (en) | EMC common-mode filter circuit applied to electric welding machine | |
| CN203289335U (en) | DC common-mode busbar integrating EMI filtering function | |
| CN203660535U (en) | Hybrid passive power filter | |
| CN209402407U (en) | Inhibit the air-conditioning frequency conversion system of common mode interference |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120321 |