CN104333340A - Electromagnetic interference filter - Google Patents
Electromagnetic interference filter Download PDFInfo
- Publication number
- CN104333340A CN104333340A CN201410518082.9A CN201410518082A CN104333340A CN 104333340 A CN104333340 A CN 104333340A CN 201410518082 A CN201410518082 A CN 201410518082A CN 104333340 A CN104333340 A CN 104333340A
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- China
- Prior art keywords
- electric capacity
- electromagnetic interference
- interference filter
- common mode
- protection circuit
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- 239000000919 ceramic Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000001052 transient effect Effects 0.000 abstract 6
- 239000011324 bead Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
The invention discloses an electromagnetic interference filter comprising a first stage protection circuit and a second stage protection circuit which are connected in parallel. The beneficial effects of the electromagnetic interference filter are that the electromagnetic interference filter comprises the first stage protection circuit and the second stage protection circuit which are connected in parallel. The first stage protection circuit is arranged in front of the second stage protection circuit along a current direction. The first stage protection circuit comprises a piezoresistor R1, a piezoresistor R2 and a discharge tube GDT. The piezoresistor R1 and the piezoresistor R2 are connected in series and then the two ends are respectively connected with the positive electrode and the negative electrode of power supply input. One end of the discharge tube GDT is connected with the connecting part of the piezoresistor R1 and the piezoresistor R2, and the other end is grounded. The second stage protection circuit comprises a transient diode D1 and a transient diode D2. The transient diode D1 and the transient diode D2 are connected in series and then the two ends of the circuit are respectively connected with the positive electrode and the negative electrode of power supply input, and the connecting part of the transient diode D1 and the transient diode D2 is grounded.
Description
Technical field
The present invention relates to a kind of filter circuit, particularly relate to a kind of Electromagnetic interference filter.
Background technology
Along with the develop rapidly of modern science and technology, the application of electronics, power electronics, electric equipment is more and more extensive, they be in operation produce high density, wide spectrum electromagnetic signal be full of whole space, form complicated electromagnetic environment.Complicated electromagnetic environment requirements electronic equipment and power supply have higher Electro Magnetic Compatibility.So suppress the technology of electromagnetic interference also more and more to come into one's own.
But existing electromagnetism anti-jamming circuit more complicated, not only increases cost, the structure of device is also made to increase.
Summary of the invention
Namely object of the present invention is the deficiency overcoming present technology, provides a kind of Electromagnetic interference filter, solves the defect that existing electromagnetism anti-jamming circuit structure is too complicated.
The present invention is achieved through the following technical solutions: Electromagnetic interference filter, comprise common mode inductance L, two inputs of common mode inductance L are connected respectively to two signal input ports, two output is connected respectively to two signal output ports, the input end of common mode inductance L is parallel with an electric capacity C1, and the output of common mode inductance L is parallel with an electric capacity C2.
Namely this device comprises two inputs, two outputs and an earth terminal.Circuit comprises common mode choke (i.e. common mode inductance L), filter capacitor C1, C2, common mode inductance L is inoperative to series mode interference, but when there is common mode disturbances, because the flow direction of two coils is identical, after overcoupling, total inductance amount increases rapidly, therefore presents very large induction reactance to common-mode signal, make it to not easily pass through, its two coils respectively around on the ferrite bead of low-loss, high permeability, when have electric current by time, the magnetic field on two coils will be strengthened mutually.When rated current is larger, the wire diameter of common mode choke also wants corresponding increase, can bear larger electric current, in addition, suitably increases inductance value, can improve low cut characteristic.C1 and C2 is mainly used to filtering series mode interference.
Further, above-mentioned electric capacity C1 and electric capacity C2 adopts film-type electric capacity.
Further, electric capacity C3 and C4 of series connection is provided with between two above-mentioned output ports, the junction ground connection of electric capacity C3 and C4.C3 and C4 can suppress common mode disturbances effectively.
Further, above-mentioned electric capacity C2 is parallel with a discharge resistance R1, protection electric capacity C2.
Further, above-mentioned electric capacity C3 and electric capacity C4 adopts ceramic condenser.
The invention has the beneficial effects as follows: a kind of electromagnetism anti-jamming circuit relatively simple for structure is provided, is made up of few electronic devices and components, for receiver port, the structure of signal pickup assembly reduced greatly.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples:
[embodiment]
As shown in Figure 1, Electromagnetic interference filter, comprise common mode inductance L, two inputs of common mode inductance L are connected respectively to two signal input ports, two output is connected respectively to two signal output ports, the input end of common mode inductance L is parallel with an electric capacity C1, and the output of common mode inductance L is parallel with an electric capacity C2.
Namely this device comprises two inputs, two outputs and an earth terminal.Circuit comprises common mode choke (i.e. common mode inductance L), filter capacitor C1, C2, common mode inductance L is inoperative to series mode interference, but when there is common mode disturbances, because the flow direction of two coils is identical, after overcoupling, total inductance amount increases rapidly, therefore presents very large induction reactance to common-mode signal, make it to not easily pass through, its two coils respectively around on the ferrite bead of low-loss, high permeability, when have electric current by time, the magnetic field on two coils will be strengthened mutually.When rated current is larger, the wire diameter of common mode choke also wants corresponding increase, can bear larger electric current, in addition, suitably increases inductance value, can improve low cut characteristic.C1 and C2 is mainly used to filtering series mode interference.
Further, above-mentioned electric capacity C1 and electric capacity C2 adopts film-type electric capacity.
Further, electric capacity C3 and C4 of series connection is provided with between two above-mentioned output ports, the junction ground connection of electric capacity C3 and C4.C3 and C4 can suppress common mode disturbances effectively.
Further, above-mentioned electric capacity C2 is parallel with a discharge resistance R1, protection electric capacity C2.
Further, above-mentioned electric capacity C3 and electric capacity C4 adopts ceramic condenser.
Claims (5)
1. Electromagnetic interference filter, it is characterized in that: comprise common mode inductance L, two inputs of common mode inductance L are connected respectively to two signal input ports, two output is connected respectively to two signal output ports, the input end of common mode inductance L is parallel with an electric capacity C1, and the output of common mode inductance L is parallel with an electric capacity C2.
2. Electromagnetic interference filter according to claim 1, is characterized in that: described electric capacity C1 and electric capacity C2 adopts film-type electric capacity.
3. Electromagnetic interference filter according to claim 1, is characterized in that: electric capacity C3 and C4 being provided with series connection between two described output ports, the junction ground connection of electric capacity C3 and C4.
4. Electromagnetic interference filter according to claim 1, is characterized in that: described electric capacity C2 is parallel with a discharge resistance R1.
5. Electromagnetic interference filter according to claim 3, is characterized in that: described electric capacity C3 and electric capacity C4 adopts ceramic condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410518082.9A CN104333340A (en) | 2014-09-30 | 2014-09-30 | Electromagnetic interference filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410518082.9A CN104333340A (en) | 2014-09-30 | 2014-09-30 | Electromagnetic interference filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104333340A true CN104333340A (en) | 2015-02-04 |
Family
ID=52408008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410518082.9A Pending CN104333340A (en) | 2014-09-30 | 2014-09-30 | Electromagnetic interference filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104333340A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104702075A (en) * | 2015-03-27 | 2015-06-10 | 浙江捷昌线性驱动科技股份有限公司 | EMC rectification method of printed wiring board for brushed direct-current motor |
| CN108718109A (en) * | 2018-06-14 | 2018-10-30 | 河南华盛隆源电气有限公司 | A kind of line feed terminals and residual voltage module detection circuit |
| CN109244720A (en) * | 2018-09-26 | 2019-01-18 | 吉林省泰华电子股份有限公司 | A kind of lightning protection red and black isolated from power filtering insert row |
| CN119269999A (en) * | 2024-11-08 | 2025-01-07 | 中国电力科学研究院有限公司 | A method and system for fault arc diagnosis based on sampling resistor voltage signal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5969583A (en) * | 1996-12-23 | 1999-10-19 | Acuson Corporation | Common-mode EMI filter with a separately wound ground winding |
| CN2798396Y (en) * | 2005-03-11 | 2006-07-19 | 周熙文 | Antic interference emergency electric source |
| CN103595241A (en) * | 2012-08-13 | 2014-02-19 | 成都思迈科技发展有限责任公司 | An anti-vibration power supply filter |
| CN103595242A (en) * | 2012-08-13 | 2014-02-19 | 成都思迈科技发展有限责任公司 | A power supply filter capable of suppressing overvoltage surges |
-
2014
- 2014-09-30 CN CN201410518082.9A patent/CN104333340A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5969583A (en) * | 1996-12-23 | 1999-10-19 | Acuson Corporation | Common-mode EMI filter with a separately wound ground winding |
| CN2798396Y (en) * | 2005-03-11 | 2006-07-19 | 周熙文 | Antic interference emergency electric source |
| CN103595241A (en) * | 2012-08-13 | 2014-02-19 | 成都思迈科技发展有限责任公司 | An anti-vibration power supply filter |
| CN103595242A (en) * | 2012-08-13 | 2014-02-19 | 成都思迈科技发展有限责任公司 | A power supply filter capable of suppressing overvoltage surges |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104702075A (en) * | 2015-03-27 | 2015-06-10 | 浙江捷昌线性驱动科技股份有限公司 | EMC rectification method of printed wiring board for brushed direct-current motor |
| CN104702075B (en) * | 2015-03-27 | 2017-07-21 | 浙江捷昌线性驱动科技股份有限公司 | A kind of EMC amelioration methods on printed wiring board for brushed DC motor |
| CN108718109A (en) * | 2018-06-14 | 2018-10-30 | 河南华盛隆源电气有限公司 | A kind of line feed terminals and residual voltage module detection circuit |
| CN109244720A (en) * | 2018-09-26 | 2019-01-18 | 吉林省泰华电子股份有限公司 | A kind of lightning protection red and black isolated from power filtering insert row |
| CN119269999A (en) * | 2024-11-08 | 2025-01-07 | 中国电力科学研究院有限公司 | A method and system for fault arc diagnosis based on sampling resistor voltage signal |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20150204 |