CN103490563A - PCB filter circuit for micromotor multipoint earthing broadband EMC - Google Patents
PCB filter circuit for micromotor multipoint earthing broadband EMC Download PDFInfo
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- CN103490563A CN103490563A CN201310386148.9A CN201310386148A CN103490563A CN 103490563 A CN103490563 A CN 103490563A CN 201310386148 A CN201310386148 A CN 201310386148A CN 103490563 A CN103490563 A CN 103490563A
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Abstract
The invention discloses a PCB filter circuit for micromotor multipoint earthing broadband EMC. The PCB filter circuit for micromotor multipoint earthing broadband EMC comprises a positive input end, a negative input end, a positive output end and a negative output end, wherein the positive input end and the negative input end are connected with a power supply, and the positive output end and the negative output end are connected with a micromotor. The PCB filter circuit for micromotor multipoint earthing broadband EMC is characterized by further comprising a first filter capacitor C1 used for restraining a differential-mode electromagnetic interference signal, and a filter unit used for restraining a common-mode electromagnetic interference signal, wherein the first filter capacitor C1 and the filter unit are arranged between the positive input end and the negative input end and between the positive output end and the negative output end in parallel in sequence. According to the PCB filter circuit for micromotor multipoint earthing broadband EMC, due to the fact that a compound circuit of multi-unit common-mode rejection and multi-unit differential-mode rejection is adopted, differential-mode electromagnetic interference and common-mode electromagnetic interference can be effectively restrained.
Description
Technical field
The present invention relates to electromagnetic compatibility (EMC, electromagnetic compatibility) filter, particularly a kind of pcb board filter circuit for electrical micro-machine multipoint earthing wideband EMC.
Background technology
Direct current machine not only is widely used on household appliances, in industrial and mining enterprises, also often sees its trace.Due to the special operation principle of direct current machine and architectural characteristic, determined that it is the important sources that in system, electromagnetic interference produces.Its reason that produces electromagnetic interference mainly contains two and selects: the one, and commutator segment spark problems, the 2nd, the back-emf transition effect that preposition rectification circuit is produced.If do not carried out the EMC protective treatment, most direct current machines can't be by various countries the standard limit about the EMC forcible authentication, wherein to export the developed country such as American-European-Japanese and regional product, especially paid close attention to.
Though the EMC design of filter has theoretical basis, in actual design, because of the concrete condition complexity, be difficult to simply apply mechanically.The direct current machine of different size is due to product parameters difference, structural manufacturing process difference etc. factor, the composition (common mode disturbances, differential mode interference) of frequency range, intensity and the electromagnetic interference signal of its generation electromagnetic interference is different, add the internal impedance frequency characteristic also different, this just requires EMC design of filter for direct current machine to consider to add personalized design, could really find best solution like this.
Mostly adopt and install the filtering devices such as discrete electric capacity, inductance additional inside and outside motor in industry at present, this method can only meet the low EMC standard required mostly, and increase along with installing device quantity increases installation difficulty, waste is a large amount of artificial, and production efficiency is greatly affected; The also useful filter circuit be assembled on pcb board, can improve some filtering performances, but the filter circuit on pcb board mostly is the LC filter circuit, but run into higher EMC, require (as CISPR-25 Level5) also to be difficult to meet, can only be client's acceptance of giving way 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 board filter circuit for electrical micro-machine multipoint earthing wideband EMC, can suppress differential mode and common mode electromagnetic interference signal, improves filtering performance.
For solving the problems of the technologies described above, technical scheme of the present invention is achieved in that
A kind of pcb board filter circuit for electrical micro-machine multipoint earthing wideband EMC, this pcb board filter circuit comprises the positive and negative input be connected with power supply and the positive and negative output be connected with electrical micro-machine, and this pcb board filter circuit also comprises the first filter capacitor C1 that suppresses the differential mode electromagnetic interference signal and the filter unit that suppresses the common mode electromagnetic interference signal; This first filter capacitor C1 and filter unit are parallel between this positive and negative input and positive and negative output successively.
As preferred version, described filter unit comprises 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 comprises inductance L 1 and is connected in parallel on capacitor C 11 and the capacitor C 12 at these inductance L 1 two ends, the common port of this capacitor C 11 and capacitor C 12 is earth terminal, and the link of described inductance L 1 and capacitor C 11 is also for being connected described positive input terminal, the link of described inductance L 1 and capacitor C 12 is also for being connected described positive output end; This second one-level π type filter circuit comprises inductance L 2 and is connected in parallel on capacitor C 21 and the capacitor C 22 at these inductance L 2 two ends, the common port of this capacitor C 21 and capacitor C 22 is earth terminal, and the link of described inductance L 2 and capacitor C 21 is also for being connected described negative input end, the link of described inductance L 2 and capacitor C 22 is also for being connected described negative output terminal.
As preferred version, described filter unit comprises the first secondary π type filter circuit and the second secondary π type filter circuit, this first secondary π type filter circuit comprises inductance L 1 and the inductance L 3 be connected in series and is connected in parallel on respectively this inductance L 1 and capacitor C 11, capacitor C 12 and the capacitor C 31 at inductance L 3 two ends, the common port of this capacitor C 11, capacitor C 12 and capacitor C 31 is earth terminal, and the link of described inductance L 1 and capacitor C 11 is also for being connected described positive input terminal, the link of described inductance L 3 and capacitor C 31 is also for being connected described positive output end; This second secondary π type filter circuit comprises inductance L 2 and the inductance L 4 be connected in series and is connected in parallel on respectively this inductance L 2 and capacitor C 21, capacitor C 22 and the capacitor C 41 at inductance L 4 two ends, the common port of this capacitor C 21, capacitor C 22 and capacitor C 41 is earth terminal, and the link of described inductance L 2 and capacitor C 21 is also for being connected described negative input end, the link of described inductance L 4 and capacitor C 41 is also for being connected described negative output terminal.
As preferred version, described earth terminal is electrically connected by the earthing rod of grounding ports and described electrical micro-machine, and the grounding ports of described earth terminal at least is provided with two.
As preferred version, described the first secondary π type filter circuit also comprises capacitor C 32, this capacitor C 32 capacitor C 31 that is connected in parallel; Described the second secondary π type filter circuit also comprises capacitor C 42, this capacitor C 42 capacitor C 41 that is connected in parallel.
As preferred version, described pcb board filter circuit also comprises the second filter capacitor C2, and this second filter capacitor C2 and the first filter capacitor C1 are connected in parallel.
As preferred version, described pcb board filter circuit also comprises piezo-resistance R, and this piezo-resistance 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, for the pcb board filter circuit of electrical micro-machine multipoint earthing wideband EMC, adopts multiple unit common mode inhibition and differential mode to suppress compound circuit, can effectively suppress differential mode and common mode electromagnetic interference.
2, the present invention is provided with a plurality of grounding ports for the pcb board filter circuit of electrical micro-machine multipoint earthing wideband EMC, improves filtering performance.
3, the present invention, for the pcb board filter circuit of the electrical micro-machine multipoint earthing wideband EMC piezo-resistance R that is connected in parallel, can filter out higher filtering voltage, reduces the generation of commutator segment spark problems.
The accompanying drawing explanation
Fig. 1 is the calcspar of the present invention for the pcb board filter circuit of electrical micro-machine multipoint earthing wideband EMC;
The schematic diagram one that Fig. 2 is filter circuit of the present invention;
The schematic diagram two that Fig. 3 is filter circuit of the present invention;
Fig. 4 is the composition structure chart of the present invention for the pcb board filter circuit of electrical micro-machine multipoint earthing wideband EMC;
The embodiment mono-that Fig. 5 is pcb board filter circuit of the present invention;
The embodiment bis-that Fig. 6 is pcb board filter circuit of the present invention;
The embodiment tri-that Fig. 7 is pcb board filter circuit of the present invention;
Fig. 8 is filtering performance curve comparison figure.
[symbol description]
1 power supply
2 electrical micro-machines
21 earthing rods
The positive supply binding post of 22 electrical micro-machines
The negative supply binding post of 23 electrical 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.
Embodiment
As shown in Figure 1 and Figure 4, pcb board filter circuit 3 of the present invention comprise with power supply 1 be electrically connected positive input terminal 33 and negative input end 34 and the positive output end 35 be electrically connected with the positive supply binding post 22 of electrical micro-machine 2, negative output terminal 36, the first filter capacitor C1 31 that suppresses the differential mode electromagnetic interference signal be electrically connected with negative supply binding post 23 and filter unit 32, the first filter capacitor C1 31 and the filter unit 32 that suppresses the common mode electromagnetic interference signal be parallel between positive input terminal 33, negative input end 34 and positive output end 35, negative output terminal 35 successively.And pcb board filter circuit 3 is installed on the end cap of electrical micro-machine 2.
This second one-level π type filter circuit comprises inductance L 2 and is connected in parallel on capacitor C 21 and the capacitor C 22 at these inductance L 2 two ends, the common port of this capacitor C 21 and capacitor C 22 is earth terminal, and the link of described inductance L 2 and capacitor C 21 is also for being connected negative input end 34, the link of described inductance L 2 and capacitor C 22 is also for being connected negative output terminal 36.
As shown in Figure 3, filter unit 32 comprises the first secondary π type filter circuit and the second secondary π type filter circuit.This first secondary π type filter circuit comprises inductance L 1 and the inductance L 3 be connected in series and is connected in parallel on respectively this inductance L 1 and capacitor C 11, capacitor C 12 and the capacitor C 31 at inductance L 3 two ends, the common port of this capacitor C 11, capacitor C 12 and capacitor C 31 is earth terminal, and the link of described inductance L 1 and capacitor C 11 is also for being connected positive input terminal 33, the link of described inductance L 3 and capacitor C 31 is also for being connected positive output end 35.
This second secondary π type filter circuit comprises inductance L 2 and the inductance L 4 be connected in series and is connected in parallel on respectively this inductance L 2 and capacitor C 21, capacitor C 22 and the capacitor C 41 at inductance L 4 two ends, the common port of this capacitor C 21, capacitor C 22 and capacitor C 41 is earth terminal, and the link of described inductance L 2 and capacitor C 21 is also for being connected negative input end 34, the link of described inductance L 4 and capacitor C 41 is also for being connected negative output terminal 36.
Described earth terminal is electrically connected by grounding ports 37 and the earthing rod 21 on electrical micro-machine 2 shells, and grounding ports 37 at least is provided with two.As shown in Figure 8, the filter curve of curve 1 for filter circuit is not installed, filter curve when curve 2 is 1 for the grounding ports of filter circuit, filter curve when curve 3 is 4 for the grounding ports of filter circuit, the filtering performance of the filter circuit that as can be seen from Figure 8 grounding ports is 4 obviously is better than the filter circuit that grounding ports is 1.Certainly, according to the needs of actual production, 2 grounding ports (as shown in Figure 6), 3 grounding ports (not shown)s or 4 grounding ports (as shown in Fig. 5 and Fig. 7) can also be set, but be not limited to this.And need reserved 4 earthing rod 21(on the shell of electrical micro-machine 2 as shown in Figure 4).
According to the power of differential mode interference signal in transmitting procedure, second filter capacitor that can be connected in parallel on the first filter capacitor C1 31, thus the size of change differential mode filter capacitor effectively suppresses differential mode interference signal (as shown in Figure 3).Power according to common mode interference signal, filter unit 31 can be selected described the first one-level π type filter circuit and the second first-level filtering wave circuit or described the first secondary filter circuit and the second secondary filter circuit, further, also comprise capacitor C 32 in described the first secondary filter circuit, this capacitor C 32 is connected in the two ends of described capacitor C 31 in parallel, and also comprise capacitor C 42 in described the second secondary filter circuit, this capacitor C 42 also is connected in the two ends of described capacitor C 41.
In addition, as shown in Figures 2 and 3 at positive input terminal 33, negative input end 34 and the first filter capacitor C1 31 piezo-resistance R that can be connected in parallel, reduce the generation of commutator segment spark problems, effectively the filtering high voltage.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (7)
1. the pcb board filter circuit for electrical micro-machine multipoint earthing wideband EMC, this pcb board filter circuit comprises the positive and negative input be connected with power supply and the positive and negative output be connected with electrical micro-machine, it is characterized in that, this pcb board filter circuit also comprises the first filter capacitor C1 that suppresses the differential mode electromagnetic interference signal and the filter unit that suppresses the common mode electromagnetic interference signal; This first filter capacitor C1 and filter unit are parallel between this positive and negative input and positive and negative output successively.
2. the pcb board filter circuit for electrical micro-machine multipoint earthing wideband EMC according to claim 1, is characterized in that, described filter unit comprises 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 comprises inductance L 1 and is connected in parallel on capacitor C 11 and the capacitor C 12 at these inductance L 1 two ends, the common port of this capacitor C 11 and capacitor C 12 is earth terminal, and the link of described inductance L 1 and capacitor C 11 is also for being connected described positive input terminal, the link of described inductance L 1 and capacitor C 12 is also for being connected described positive output end;
This second one-level π type filter circuit comprises inductance L 2 and is connected in parallel on capacitor C 21 and the capacitor C 22 at these inductance L 2 two ends, the common port of this capacitor C 21 and capacitor C 22 is earth terminal, and the link of described inductance L 2 and capacitor C 21 is also for being connected described negative input end, the link of described inductance L 2 and capacitor C 22 is also for being connected described negative output terminal.
3. the pcb board filter circuit for electrical micro-machine multipoint earthing wideband EMC according to claim 1, is characterized in that, described filter unit comprises the first secondary π type filter circuit and the second secondary π type filter circuit,
This first secondary π type filter circuit comprises inductance L 1 and the inductance L 3 be connected in series and is connected in parallel on respectively this inductance L 1 and capacitor C 11, capacitor C 12 and the capacitor C 31 at inductance L 3 two ends, the common port of this capacitor C 11, capacitor C 12 and capacitor C 31 is earth terminal, and the link of described inductance L 1 and capacitor C 11 is also for being connected described positive input terminal, the link of described inductance L 3 and capacitor C 31 is also for being connected described positive output end;
This second secondary π type filter circuit comprises inductance L 2 and the inductance L 4 be connected in series and is connected in parallel on respectively this inductance L 2 and capacitor C 21, capacitor C 22 and the capacitor C 41 at inductance L 4 two ends, the common port of this capacitor C 21, capacitor C 22 and capacitor C 41 is earth terminal, and the link of described inductance L 2 and capacitor C 21 is also for being connected described negative input end, the link of described inductance L 4 and capacitor C 41 is also for being connected described negative output terminal.
4. according to the described pcb board filter circuit for electrical micro-machine multipoint earthing wideband EMC of claim 2 or 3, it is characterized in that, described earth terminal is electrically connected by the earthing rod of grounding ports and described electrical micro-machine, and the grounding ports of described earth terminal at least is provided with two.
5. the pcb board filter circuit for electrical micro-machine multipoint earthing wideband EMC according to claim 3, is characterized in that, described the first secondary π type filter circuit also comprises capacitor C 32, this capacitor C 32 capacitor C 31 that is connected in parallel; Described the second secondary π type filter circuit also comprises capacitor C 42, this capacitor C 42 capacitor C 41 that is connected in parallel.
6. the pcb board filter circuit for electrical micro-machine multipoint earthing wideband EMC according to claim 1, is characterized in that, described pcb board filter circuit also comprises the second filter capacitor C2, and this second filter capacitor C2 and the first filter capacitor C1 are connected in parallel.
7. the pcb board filter circuit for electrical micro-machine multipoint earthing wideband EMC according to claim 1, it is characterized in that, described pcb board filter circuit also comprises piezo-resistance R, and this piezo-resistance R is connected in parallel between this positive and negative input and the first filter capacitor 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 |
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| 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 |
|---|---|
| CN103490563A true CN103490563A (en) | 2014-01-01 |
| CN103490563B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923591A (en) * | 2018-09-28 | 2018-11-30 | 浙江凯威碳材料有限公司 | A kind of micro machine anti-interference protective device of semicircular ring electromagnetic compatibility |
| WO2020035005A1 (en) * | 2018-08-16 | 2020-02-20 | 广东肇庆爱龙威机电有限公司 | Brushed direct-current electric motor |
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| CN203027172U (en) * | 2012-12-17 | 2013-06-26 | 芜湖博耐尔汽车电气***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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| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020035005A1 (en) * | 2018-08-16 | 2020-02-20 | 广东肇庆爱龙威机电有限公司 | Brushed direct-current electric motor |
| CN110868000A (en) * | 2018-08-16 | 2020-03-06 | 广东肇庆爱龙威机电有限公司 | DC brush motor |
| CN108923591A (en) * | 2018-09-28 | 2018-11-30 | 浙江凯威碳材料有限公司 | A kind of micro machine anti-interference protective device of semicircular ring electromagnetic compatibility |
| 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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| CN103490563B (en) | 2016-08-17 |
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