CN103490563B - PCB filter circuit for micro machine multipoint earthing wideband EMC - Google Patents
PCB filter circuit for micro machine multipoint earthing wideband EMC Download PDFInfo
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- CN103490563B CN103490563B CN201310386148.9A CN201310386148A CN103490563B CN 103490563 B CN103490563 B CN 103490563B CN 201310386148 A CN201310386148 A CN 201310386148A CN 103490563 B CN103490563 B CN 103490563B
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Abstract
The invention discloses a kind of PCB filter circuit for micro machine multipoint earthing wideband EMC, this PCB filter circuit includes the positive and negative input being connected with power supply and the positive and negative outfan being connected with micro machine, it is characterized in that, this PCB filter circuit also includes the first filter capacitor C1 and the filter unit of suppression common mode electromagnetic interference signal suppressing differential mode electromagnetic interference signal；This first filter capacitor C1 and filter unit are parallel between this positive and negative input and positive and negative outfan successively.The present invention uses multiple-unit common mode inhibition and differential mode suppression compound circuit for the PCB filter circuit of micro machine multipoint earthing wideband EMC, can effectively suppress differential mode and common mode electromagnetic interference.
Description
Technical field
The present invention relates to electromagnetic compatibility (EMC, electromagnetic
Compatibility) filter, particularly to a kind of PCB filter circuit for micro machine multipoint earthing wideband EMC.
Background technology
Direct current generator is not only widely used on household appliances, is also frequently seen its trace in industrial and mining establishment.The operation principle special due to direct current generator and architectural characteristic, determining it is the important sources that in system, electromagnetic interference produces.Its reason producing electromagnetic interference mainly has two to select: one is commutator segment spark problems, and two is the back-emf transition effect producing preposition rectification circuit.If do not carried out EMC protective treatment, overwhelming majority direct current generator wherein especially cannot be paid close attention to the American-European-Japanese product waiting developed countries and regions of outlet by various countries about the standard limit of EMC forcible authentication.
Though the design of EMC wave filter has theoretical basis, but complicated because of concrete condition in actual design, it is difficult to simply apply mechanically.The direct current generator of different size is due to product parameters difference, structural manufacturing process difference etc. factor, its composition (common mode disturbances, differential mode interference) producing the frequency range of electromagnetic interference, intensity and electromagnetic interference signal is different, add internal impedance frequency characteristic the most different, this just requires to design for the EMC wave filter of direct current generator to consider the design adding personalization, so could really find best solution.
Mostly use at present filtering devices such as installing discrete electric capacity, inductance inside and outside motor additional in industry, this method can only meet the EMC standard of relatively low requirement mostly, and along with installing device increasing number installation difficulty increases, waste is a large amount of artificial, and production efficiency is greatly affected；The most useful filter circuit being assembled on pcb board, some filtering performances can be improved, but the filter circuit on pcb board mostly is LC filter circuit, but runs into higher EMC and require that (such as CISPR-25 Level5) also is difficult to meet, can only be that client gives way acceptance mostly.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of PCB filter circuit for micro machine multipoint earthing wideband EMC, can suppress differential mode and common mode electromagnetic interference signal, improves filtering performance.
For solving above-mentioned technical problem, the technical scheme is that and be achieved in that:
A kind of PCB filter circuit for micro machine multipoint earthing wideband EMC, this PCB filter circuit includes the positive and negative input being connected with power supply and the positive and negative outfan being connected with micro machine, and this PCB filter circuit also includes the first filter capacitor C1 and the filter unit of suppression common mode electromagnetic interference signal suppressing differential mode electromagnetic interference signal；This first filter capacitor C1 and filter unit are parallel between this positive and negative input and positive and negative outfan successively.
Preferably, described filter unit includes the first one-level π type filter circuit and the second one-level π type filter circuit；This first one-level π type filter circuit includes inductance L1 and is connected in parallel on the electric capacity C11 and electric capacity C12 at this inductance L1 two ends, the common port of this electric capacity C11 and electric capacity C12 is earth terminal, and the connection end of described inductance L1 and electric capacity C11 is additionally operable to connect described positive input terminal, the connection end of described inductance L1 and electric capacity C12 is additionally operable to connect described positive output end；This second one-level π type filter circuit includes inductance L2 and is connected in parallel on the electric capacity C21 and electric capacity C22 at this inductance L2 two ends, the common port of this electric capacity C21 and electric capacity C22 is earth terminal, and the connection end of described inductance L2 and electric capacity C21 is additionally operable to connect described negative input end, the connection end of described inductance L2 and electric capacity C22 is additionally operable to connect described negative output terminal.
Preferably, described filter unit includes the one or two grade of π type filter circuit and the two or two grade of π type filter circuit, one or two grade of π type filter circuit includes the inductance L1 being connected in series and inductance L3 and is connected in parallel on this inductance L1 and the electric capacity C11 at inductance L3 two ends, electric capacity C12 and electric capacity C31 respectively, the common port of this electric capacity C11, electric capacity C12 and electric capacity C31 is earth terminal, and the connection end of described inductance L1 and electric capacity C11 is additionally operable to connect described positive input terminal, the connection end of described inductance L3 and electric capacity C31 is additionally operable to connect described positive output end；Two or two grade of π type filter circuit includes the inductance L2 being connected in series and inductance L4 and is connected in parallel on this inductance L2 and the electric capacity C21 at inductance L4 two ends, electric capacity C22 and electric capacity C41 respectively, the common port of this electric capacity C21, electric capacity C22 and electric capacity C41 is earth terminal, and the connection end of described inductance L2 and electric capacity C21 is additionally operable to connect described negative input end, the connection end of described inductance L4 and electric capacity C41 is additionally operable to connect described negative output terminal.
Preferably, described earth terminal is electrically connected with by the earthing rod of grounding ports with described micro machine, and the grounding ports of described earth terminal is at least provided with two.
Preferably, described one or two grade of π type filter circuit also includes electric capacity C32, and this electric capacity C32 is connected in parallel electric capacity C31；Described two or two grade of π type filter circuit also includes electric capacity C42, and this electric capacity C42 is connected in parallel electric capacity C41.
Preferably, described PCB filter circuit also includes the second filter capacitor C2, and this second filter capacitor C2 and the first filter capacitor C1 is connected in parallel.
Preferably, described PCB filter circuit also includes varistor R, and this varistor R is connected in parallel between this positive and negative input and the first filter capacitor C1.
The technique effect that the present invention reaches is as follows:
1, the present invention is for the PCB filter circuit of micro machine multipoint earthing wideband EMC, uses multiple-unit common mode inhibition and differential mode suppression compound circuit, can effectively suppress differential mode and common mode electromagnetic interference.
2, the present invention is provided with multiple grounding ports for the PCB filter circuit of micro machine multipoint earthing wideband EMC, improves filtering performance.
3, the present invention is connected in parallel varistor R in the PCB filter circuit of micro machine multipoint earthing wideband EMC, may filter that higher filtering voltage, reduces the generation of commutator segment spark problems.
Accompanying drawing explanation
Fig. 1 is the present invention block chart for the PCB filter circuit of micro machine multipoint earthing wideband EMC；
Fig. 2 is the schematic diagram one of filter circuit of the present invention；
Fig. 3 is the schematic diagram two of filter circuit of the present invention；
Fig. 4 is the present invention composition structure chart for the PCB filter circuit of micro machine multipoint earthing wideband EMC；
Fig. 5 is the embodiment one of PCB filter circuit of the present invention；
Fig. 6 is the embodiment two of PCB filter circuit of the present invention；
Fig. 7 is the embodiment three of PCB filter circuit of the present invention；
Fig. 8 is filtering performance curve comparison figure.
[symbol description]
1 power supply
2 micro machines
21 earthing rods
The positive supply binding post of 22 micro machines
The negative supply binding post of 23 micro machines
3 PCB filter circuits
31 first filter capacitor C1
32 filter units
33 positive input terminals
34 negative input ends
35 positive output ends
36 negative output terminals
37 grounding ports.
Detailed description of the invention
As shown in Figure 1 and Figure 4, PCB filter circuit 3 of the present invention includes negative output terminal 36, the first filter capacitor C1 31 of suppression differential mode electromagnetic interference signal and the filter unit 32 of suppression common mode electromagnetic interference signal being electrically connected with positive input terminal 33 and negative input end 34 and the positive output end 35 being electrically connected with the positive supply binding post 22 of micro machine 2 with power supply 1 and negative supply binding post 23 is electrically connected with, and the first filter capacitor C1 31 and filter unit 32 are parallel between positive input terminal 33, negative input end 34 and positive output end 35, negative output terminal 35 successively.And PCB filter circuit 3 is installed on the end cap of micro machine 2.
Filter unit 32 includes two at least one-level π type filter circuits.As in figure 2 it is shown, filter unit 32 includes the first one-level π type filter circuit and the second one-level π type filter circuit.This first one-level π type filter circuit includes inductance L1 and is connected in parallel on the electric capacity C11 and electric capacity C12 at this inductance L1 two ends, the common port of this electric capacity C11 and electric capacity C12 is earth terminal, and the connection end of described inductance L1 and electric capacity C11 is additionally operable to connect positive input terminal 33, the connection end of described inductance L1 and electric capacity C12 is additionally operable to connect positive output end 35.
This second one-level π type filter circuit includes inductance L2 and is connected in parallel on the electric capacity C21 and electric capacity C22 at this inductance L2 two ends, the common port of this electric capacity C21 and electric capacity C22 is earth terminal, and the connection end of described inductance L2 and electric capacity C21 is additionally operable to connect negative input end 34, the connection end of described inductance L2 and electric capacity C22 is additionally operable to connect negative output terminal 36.
As it is shown on figure 3, filter unit 32 includes the one or two grade of π type filter circuit and the two or two grade of π type filter circuit.One or two grade of π type filter circuit includes the inductance L1 being connected in series and inductance L3 and is connected in parallel on this inductance L1 and the electric capacity C11 at inductance L3 two ends, electric capacity C12 and electric capacity C31 respectively, the common port of this electric capacity C11, electric capacity C12 and electric capacity C31 is earth terminal, and the connection end of described inductance L1 and electric capacity C11 is additionally operable to connect positive input terminal 33, the connection end of described inductance L3 and electric capacity C31 is additionally operable to connect positive output end 35.
Two or two grade of π type filter circuit includes the inductance L2 being connected in series and inductance L4 and is connected in parallel on this inductance L2 and the electric capacity C21 at inductance L4 two ends, electric capacity C22 and electric capacity C41 respectively, the common port of this electric capacity C21, electric capacity C22 and electric capacity C41 is earth terminal, and the connection end of described inductance L2 and electric capacity C21 is additionally operable to connect negative input end 34, the connection end of described inductance L4 and electric capacity C41 is additionally operable to connect negative output terminal 36.
Described earth terminal is electrically connected with the earthing rod 21 on micro machine 2 shell by grounding ports 37, and grounding ports 37 is at least provided with two.As shown in Figure 8, curve 1 is the filter curve not installing filter circuit, curve 2 be the grounding ports of filter circuit be filter curve when 1, curve 3 be the grounding ports of filter circuit be filter curve when 4, as can be seen from Figure 8 grounding ports is that the filtering performance of filter circuit of 4 is substantially better than the filter circuit that grounding ports is 1.Certainly, according to the needs of actual production, it is also possible to arrange 2 grounding ports (as shown in Figure 6), 3 grounding ports (not shown)s or 4 grounding ports (as shown in figure 5 and figure 7), but be not limited to this.And need reserved 4 earthing rod 21(on the shell of micro machine 2 as shown in Figure 4).
According to the power of differential mode interference signal in transmitting procedure, the second filter capacitor can be connected in parallel on the first filter capacitor C1 31, thus change the size of differential mode filter capacitor, effective suppression differential mode interference signal (as shown in Figure 3).Power according to common mode interference signal, filter unit 31 may select described first one-level π type filter circuit and the second first-level filtering wave circuit or described first secondary filter circuit and the second secondary filter circuit, further, described first secondary filter circuit also includes electric capacity C32, this electric capacity C32 is connected in the two ends of described electric capacity C31 in parallel, and described second secondary filter circuit also includes electric capacity C42, this electric capacity C42 is also connected in the two ends of described electric capacity C41.
Additionally, varistor R can be connected in parallel at positive input terminal 33, negative input end 34 and the first filter capacitor C1 31 as shown in Figures 2 and 3, reduces the generation of commutator segment spark problems, effectively filter out high voltage.
The above, only presently preferred embodiments of the present invention, it is not intended to limit protection scope of the present invention.
Claims (7)
1., for a PCB filter circuit of micro machine multipoint earthing wideband EMC, this PCB filter circuit includes and power supply
Positive and negative input that power supply connects and the positive and negative outfan that is connected with micro machine, it is characterised in that this PCB filter circuit
Also include the first filter capacitor C1 and the filter unit of suppression common mode electromagnetic interference signal suppressing differential mode electromagnetic interference signal；Should
First filter capacitor C1 and filter unit are parallel between this positive and negative input and positive and negative outfan successively；
Described filter unit includes the first one-level π type filter circuit and the second one-level π type filter circuit；
This first one-level π type filter circuit includes inductance L1 and is connected in parallel on the electric capacity C11 and electric capacity C12 at this inductance L1 two ends, should
The common port of electric capacity C11 and electric capacity C12 is earth terminal, and the connection end of described inductance L1 and electric capacity C11 is additionally operable to described in connection
Positive input terminal, the connection end of described inductance L1 and electric capacity C12 is additionally operable to connect described positive output end；
This second one-level π type filter circuit includes inductance L2 and is connected in parallel on the electric capacity C21 and electric capacity C22 at this inductance L2 two ends, should
The common port of electric capacity C21 and electric capacity C22 is earth terminal, and the connection end of described inductance L2 and electric capacity C21 is additionally operable to described in connection
Negative input end, the connection end of described inductance L2 and electric capacity C22 is additionally operable to connect described negative output terminal；
This earth terminal is electrically connected with by the earthing rod of grounding ports with described micro machine, and the grounding ports of this earth terminal is at least
It is provided with two.
PCB filter circuit for micro machine multipoint earthing wideband EMC the most according to claim 1, it is characterised in that
Described PCB filter circuit also includes the second filter capacitor C2, and this second filter capacitor C2 and the first filter capacitor C1 parallel connection are even
Connect.
PCB filter circuit for micro machine multipoint earthing wideband EMC the most according to claim 1, it is characterised in that
Described PCB filter circuit also includes varistor R, and this varistor R is connected in this positive and negative input and the first filtering in parallel
Between electric capacity C1.
4., for a PCB filter circuit of micro machine multipoint earthing wideband EMC, this PCB filter circuit includes and power supply
Positive and negative input that power supply connects and the positive and negative outfan that is connected with micro machine, it is characterised in that this PCB filter circuit
Also include the first filter capacitor C1 and the filter unit of suppression common mode electromagnetic interference signal suppressing differential mode electromagnetic interference signal；Should
First filter capacitor C1 and filter unit are parallel between this positive and negative input and positive and negative outfan successively；Described filter unit
Including the one or two grade of π type filter circuit and the two or two grade of π type filter circuit,
One or two grade of π type filter circuit include the inductance L1 being connected in series and inductance L3 and be connected in parallel on respectively this inductance L1 and
The electric capacity C11 at inductance L3 two ends, electric capacity C12 and electric capacity C31, the common port of this electric capacity C11, electric capacity C12 and electric capacity C31 is ground connection
Hold, and the connection end of described inductance L1 and electric capacity C11 is additionally operable to connect described positive input terminal, described inductance L3 and electric capacity C31's
Connect end to be additionally operable to connect described positive output end；
Two or two grade of π type filter circuit include the inductance L2 being connected in series and inductance L4 and be connected in parallel on respectively this inductance L2 and
The electric capacity C21 at inductance L4 two ends, electric capacity C22 and electric capacity C41, the common port of this electric capacity C21, electric capacity C22 and electric capacity C41 is ground connection
Hold, and the connection end of described inductance L2 and electric capacity C21 is additionally operable to connect described negative input end, described inductance L4 and electric capacity C41's
Connect end to be additionally operable to connect described negative output terminal；
This earth terminal is electrically connected with by the earthing rod of grounding ports with described micro machine, and the grounding ports of this earth terminal is at least
It is provided with two.
PCB filter circuit for micro machine multipoint earthing wideband EMC the most according to claim 4, it is characterised in that
Described one or two grade of π type filter circuit also includes electric capacity C32, and this electric capacity C32 is connected in parallel electric capacity C31；Described two or two grade of π type
Filter circuit also includes electric capacity C42, and this electric capacity C42 is connected in parallel electric capacity C41.
PCB filter circuit for micro machine multipoint earthing wideband EMC the most according to claim 4, it is characterised in that
Described PCB filter circuit also includes the second filter capacitor C2, and this second filter capacitor C2 and the first filter capacitor C1 parallel connection are even
Connect.
PCB filter circuit for micro machine multipoint earthing wideband EMC the most according to claim 4, it is characterised in that
Described PCB filter circuit also includes varistor R, and this varistor R is connected in this positive and negative input and the first filtering in parallel
Between electric capacity C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310386148.9A CN103490563B (en) | 2013-08-30 | 2013-08-30 | PCB filter circuit for micro machine multipoint earthing wideband EMC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310386148.9A CN103490563B (en) | 2013-08-30 | 2013-08-30 | PCB filter circuit for micro machine multipoint earthing wideband EMC |
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| Publication Number | Publication Date |
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| CN103490563A CN103490563A (en) | 2014-01-01 |
| CN103490563B true CN103490563B (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310386148.9A Active CN103490563B (en) | 2013-08-30 | 2013-08-30 | PCB filter circuit for micro machine multipoint earthing wideband EMC |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868000A (en) * | 2018-08-16 | 2020-03-06 | 广东肇庆爱龙威机电有限公司 | DC brush motor |
| CN108923591B (en) * | 2018-09-28 | 2023-12-01 | 浙江凯威碳材料有限公司 | Semi-circular ring electromagnetic compatibility anti-interference protection device for micro motor |
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| US4795951A (en) * | 1986-09-30 | 1989-01-03 | Siemens Aktiengesellschaft | D-C commutator motor with means for interference suppression |
| JP2003153496A (en) * | 2001-11-12 | 2003-05-23 | Matsushita Electric Ind Co Ltd | Motor control unit |
| CN1581685A (en) * | 2004-01-08 | 2005-02-16 | 邓树兴 | Electromagnetic compatible filter network and filter network module |
| CN2938568Y (en) * | 2006-02-09 | 2007-08-22 | 浙江科锋汽车电器有限公司 | Electromagnetic compatible anti-interference device of vehicle permanent magnetic DC motor |
| CN201584861U (en) * | 2009-12-21 | 2010-09-15 | 东莞市瑞柯电机有限公司 | EMC filter circuit board welded on motor |
| WO2012175590A1 (en) * | 2011-06-21 | 2012-12-27 | Valeo Systèmes d'Essuyage | Band attenuation filter |
| CN203027172U (en) * | 2012-12-17 | 2013-06-26 | 芜湖博耐尔汽车电气系统有限公司 | Direct-current motor driving circuit |
| CN203423588U (en) * | 2013-08-30 | 2014-02-05 | 武汉为腾科技有限公司 | PCB filter circuit used for micro-motor multipoint grounding broadband EMC |
-
2013
- 2013-08-30 CN CN201310386148.9A patent/CN103490563B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4795951A (en) * | 1986-09-30 | 1989-01-03 | Siemens Aktiengesellschaft | D-C commutator motor with means for interference suppression |
| JP2003153496A (en) * | 2001-11-12 | 2003-05-23 | Matsushita Electric Ind Co Ltd | Motor control unit |
| CN1581685A (en) * | 2004-01-08 | 2005-02-16 | 邓树兴 | Electromagnetic compatible filter network and filter network module |
| CN2938568Y (en) * | 2006-02-09 | 2007-08-22 | 浙江科锋汽车电器有限公司 | Electromagnetic compatible anti-interference device of vehicle permanent magnetic DC motor |
| CN201584861U (en) * | 2009-12-21 | 2010-09-15 | 东莞市瑞柯电机有限公司 | EMC filter circuit board welded on motor |
| WO2012175590A1 (en) * | 2011-06-21 | 2012-12-27 | Valeo Systèmes d'Essuyage | Band attenuation filter |
| CN203027172U (en) * | 2012-12-17 | 2013-06-26 | 芜湖博耐尔汽车电气系统有限公司 | Direct-current motor driving circuit |
| CN203423588U (en) * | 2013-08-30 | 2014-02-05 | 武汉为腾科技有限公司 | PCB filter circuit used for micro-motor multipoint grounding broadband EMC |
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| CN103490563A (en) | 2014-01-01 |
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