CN105162431A - Broadband surface-mounted EMI filter for suppressing electromagnetic interference - Google Patents
Broadband surface-mounted EMI filter for suppressing electromagnetic interference Download PDFInfo
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- CN105162431A CN105162431A CN201510558429.7A CN201510558429A CN105162431A CN 105162431 A CN105162431 A CN 105162431A CN 201510558429 A CN201510558429 A CN 201510558429A CN 105162431 A CN105162431 A CN 105162431A
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- electric capacity
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- circuit board
- choke
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Abstract
The invention discloses a broadband surface-mounted EMI filter for suppressing electromagnetic interference. The broadband surface-mounted EMI filter comprises a tube shell (1), and also a choking coil (3), capacitors (2) and a printed circuit board (4), wherein the two ends of the tube shell (1) are insulated by insulators; the printed circuit board (4) is glued on the bottom of the hollow cavity of the tube shell (1); the choking coil (3) is welded in the central position of the printed circuit board (4); four capacitors (2) are provided, wherein two capacitors are located between the input end of the tube shell and the choking coil, while the other two capacitors are located between the choking coil and the output end of the tube shell. The broadband surface-mounted EMI filter for suppressing the electromagnetic interference is small in volume, wide in filter frequency range and good in high-frequency electromagnetic interference suppression effect, and has favorable application prospect.
Description
Technical field
The present invention relates to a kind of broadband Surface Mount electromagnetic interface filter, particularly a kind of for suppressing the broadband Surface Mount electromagnetic interface filter of electromagnetic interference.
Background technology
Electromagnetic interface filter is the product of electromagnetic compatibility development, is to solve electromagnetic interference, realize electromagnetic compatibility first-selection and must use device.Tie up on integrated battlefield at " land, sea, air, sky, magnetic " five, all will use a large amount of electronics between ourselves and the enemy, Battle Field Electromagnetic will be very complicated, and electromagnetic compatibility problem will be more and more outstanding.Electromagnetic compatibility refers to that, under same Battle Field Electromagnetic, various main battle weaponry can perform respective fight function, and each equipment and each subsystem can normally work, and not by the interference of other equipments, does not also disturb other to equip.If the combat system-of-systems of oneself exists the incompatible problem of electromagnetism, will be out of action.Electromagnetic interface filter can not be substituted in the application in solution electromagnetic interference, raising antijamming capability field.
Clock circuit, high-frequency circuit (microwave circuit) etc. are main radiated interference sources, the clutter produced during the work such as crystal oscillator, switching device, harmonic wave can cause on power supply stronger high frequency radiation electromagnetic interference, and designing such circuit is ensure that complete machine reaches the key of radiation index.
The passive port network that electromagnetic interface filter part is mainly made up of the components and parts such as inductance, electric capacity.Inductance can the various ways such as, printed circuit form new-type with magnetic core coiling form, air core inductor exist, and same electric capacity also can exist with the various ways such as discrete capacitor, printed circuit.Traditional electromagnetic interface filter is by the impact of device, circuit structure, distributed constant, and volume is bigger than normal, filter range is narrow, high frequency characteristics is poor.
Summary of the invention
The object of the invention is to provide a kind of for suppressing the broadband Surface Mount electromagnetic interface filter of electromagnetic interference, solves that small product size of the prior art is large, the problem of frequency filtering narrow range, high frequency characteristics difference.
For suppressing a broadband Surface Mount electromagnetic interface filter for electromagnetic interference, comprising shell, also comprising: choke, electric capacity and printed circuit board.
Described shell is the rectangular tubular housing of hollow, and two openends of shell are sealed by the insulator of the band pin sintered respectively, and defining wherein one end is input, and the other end is output; Described printed circuit board is the FR-4 double-sided metal thin plate that surface is printed with circuit, and printed circuit board is pasted onto the bottom of shell hollow cavity, and is connected with the input pin of shell and output pin; Described choke is the magnet ring structure of enamelled wire coiling, by the center of wire bonds at printed circuit board; Described electric capacity is the X2Y capacitor that " X " electric capacity combines with electrode in " Y " electric capacity, shape is rectangle and has 4, be numbered C1, C2, C3 and C4 respectively, wherein electric capacity C1 and electric capacity C2 all welds between input on a printed circuit board and choke, and be connected with input and choke respectively by printed circuit, wherein electric capacity C1 and electric capacity C2 is in parallel; Electric capacity C3 and electric capacity C4 all welds on a printed circuit board between output and choke, and is connected with choke and output respectively by printed circuit, and wherein electric capacity C3 and electric capacity C4 is in parallel.
Full frequency band signal enters printed circuit board by shell input pin, through the bypass of electric capacity C1 and electric capacity C2, reflection and isolation, tentatively suppresses the interference signal in full frequency band signal; Then through the reflection of choke, absorption and shielding isolation, interference signal is suppressed further; Then through the bypass of electric capacity C3 and electric capacity C4, reflection and isolation, last suppression is carried out to interference signal, exports finally by shell output pin.
This technology shell inside cavity adopts three-dimensional irregular design according to the profile of components and parts, expands inner space, guarantees structural strength.The X2Y capacitor that electric capacity adopts " X " electric capacity and " Y " electric capacity to combine, reduces volume.Choke suppresses electromagnetic interference by eddy current loss, carries out offsetting reducing distributed constant to the impact of high frequency performance to parasitic capacitance.Printed board adopts Low ESR grounding technology, is embodied in large area ground connection and multipoint earthing; Adopting the isolation technology of high impedance, be embodied in ground wire separating signal transmssion line, by connecting transmission after capacitor filtering, improving high frequency performance.By described structural design, realize that volume is little, frequency filtering wide ranges, high-frequency electromagnetic interference suppressioning effect are good.
Accompanying drawing explanation
Fig. 1 is a kind of for suppressing the structure chart of the broadband Surface Mount electromagnetic interface filter of electromagnetic interference;
Fig. 2 is a kind of for suppressing the printed circuit board circuit diagram of the broadband Surface Mount electromagnetic interface filter of electromagnetic interference.
1. shell 2. electric capacity 3. choke 4. printed circuit board.
Embodiment
For suppressing a broadband Surface Mount electromagnetic interface filter for electromagnetic interference, comprising shell 1, characterized by further comprising: choke 3, electric capacity 2 and printed circuit board 4.
Described shell 1 is the rectangular tubular housing of hollow, and two openends of shell are sealed by the insulator of the band pin sintered respectively, and defining wherein one end is input, and the other end is output; Described printed circuit board 4 is that surface is printed with the FR-4 double-sided metal thin plate of circuit, and printed circuit board 4 is pasted onto the bottom of shell 1 hollow cavity, and is connected with the input pin of shell 1 and output pin; Described choke 3 is the magnet ring structure of enamelled wire coiling, by the center of wire bonds at printed circuit board 4; Described electric capacity 2 is the X2Y capacitor that " X " electric capacity combines with electrode in " Y " electric capacity, shape is rectangle and has 4, be numbered C1, C2, C3 and C4 respectively, wherein electric capacity C1 and electric capacity C2 is all welded between input on printed circuit board 4 and choke, and be connected with input and choke 3 respectively by printed circuit, wherein electric capacity C1 and electric capacity C2 is in parallel; Electric capacity C3 and electric capacity C4 is all welded on printed circuit board 4 between output and choke, and is connected with choke 3 and output respectively by printed circuit, and wherein electric capacity C3 and electric capacity C4 is in parallel.
Full frequency band signal enters printed circuit board 4 by shell 1 input pin, through the bypass of electric capacity C1 and electric capacity C2, reflection and isolation, tentatively suppresses the interference signal in full frequency band signal; Then through the reflection of choke 3, absorption and shielding isolation, interference signal is suppressed further; Then through the bypass of electric capacity C3 and electric capacity C4, reflection and isolation, last suppression is carried out to interference signal, exports finally by shell 1 output pin.
Claims (1)
1. for suppressing a broadband Surface Mount electromagnetic interface filter for electromagnetic interference, comprising shell (1), characterized by further comprising: choke (3), electric capacity (2) and printed circuit board (4);
The rectangular tubular housing that described shell (1) is hollow, two openends of shell are sealed by the insulator of the band pin sintered respectively, and defining wherein one end is input, and the other end is output; Described printed circuit board (4) is that surface is printed with the FR-4 double-sided metal thin plate of circuit, and printed circuit board (4) is pasted onto the bottom of shell (1) hollow cavity, and is connected with the input pin of shell (1) and output pin; The magnet ring structure that described choke (3) is enamelled wire coiling, by the center of wire bonds in printed circuit board (4); Described electric capacity (2) is the X2Y capacitor that " X " electric capacity combines with electrode in " Y " electric capacity, shape is rectangle and has 4, be numbered C1, C2, C3 and C4 respectively, wherein electric capacity C1 and electric capacity C2 is all welded between input on printed circuit board (4) and choke, and be connected with shell input and choke (3) respectively by printed circuit, wherein electric capacity C1 and electric capacity C2 is in parallel; Electric capacity C3 and electric capacity C4 is all welded between output on printed circuit board (4) and choke, and is connected with choke (3) and shell output respectively by printed circuit, and wherein electric capacity C3 and electric capacity C4 is in parallel;
Full frequency band signal enters printed circuit board (4) by shell (1) input pin, through the bypass of electric capacity C1 and electric capacity C2, reflection and isolation, tentatively suppresses the interference signal in full frequency band signal; Then the reflection through choke (3), absorption and shielding isolation, suppress further to interference signal; Then through the bypass of electric capacity C3 and electric capacity C4, reflection and isolation, last suppression is carried out to interference signal, exports finally by shell (1) output pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510558429.7A CN105162431B (en) | 2015-09-06 | 2015-09-06 | A kind of broadband Surface Mount electromagnetic interface filter for suppression electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510558429.7A CN105162431B (en) | 2015-09-06 | 2015-09-06 | A kind of broadband Surface Mount electromagnetic interface filter for suppression electromagnetic interference |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105162431A true CN105162431A (en) | 2015-12-16 |
| CN105162431B CN105162431B (en) | 2017-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510558429.7A Active CN105162431B (en) | 2015-09-06 | 2015-09-06 | A kind of broadband Surface Mount electromagnetic interface filter for suppression electromagnetic interference |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106028774A (en) * | 2016-07-14 | 2016-10-12 | 贵州航天计量测试技术研究所 | Small EMI filter device capable of suppressing spike noise |
| CN107708398A (en) * | 2017-10-12 | 2018-02-16 | 四川中光防雷科技股份有限公司 | A kind of high reliability EMI filtration modules |
| CN108155888A (en) * | 2018-01-05 | 2018-06-12 | 北京航天微电科技有限公司 | A kind of LTCC heavy EMI filters for powered electromagnetic to be inhibited to interfere |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08162883A (en) * | 1994-12-02 | 1996-06-21 | Pfu Ltd | Emi filter |
| CN2561159Y (en) * | 2001-08-09 | 2003-07-16 | 神达电脑股份有限公司 | Electromagnetic interference wave filter for power source supplier |
| CN201682426U (en) * | 2010-05-24 | 2010-12-22 | 合肥恒磊电子科技有限公司 | AC/DC conversion device with low harmonic wave and high accuracy |
| CN103208914A (en) * | 2013-03-18 | 2013-07-17 | 南京航空航天大学 | Planar EMI (electromagnetic interference) filter for high-power application |
-
2015
- 2015-09-06 CN CN201510558429.7A patent/CN105162431B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08162883A (en) * | 1994-12-02 | 1996-06-21 | Pfu Ltd | Emi filter |
| CN2561159Y (en) * | 2001-08-09 | 2003-07-16 | 神达电脑股份有限公司 | Electromagnetic interference wave filter for power source supplier |
| CN201682426U (en) * | 2010-05-24 | 2010-12-22 | 合肥恒磊电子科技有限公司 | AC/DC conversion device with low harmonic wave and high accuracy |
| CN103208914A (en) * | 2013-03-18 | 2013-07-17 | 南京航空航天大学 | Planar EMI (electromagnetic interference) filter for high-power application |
Non-Patent Citations (2)
| Title |
|---|
| 区健昌: "X2Y一种新型的EMI滤波器", 《电气技术》 * |
| 沙占友: "《LED照明驱动电源优化设计》", 30 April 2014, 北京：中国电力出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106028774A (en) * | 2016-07-14 | 2016-10-12 | 贵州航天计量测试技术研究所 | Small EMI filter device capable of suppressing spike noise |
| CN106028774B (en) * | 2016-07-14 | 2019-01-04 | 贵州航天计量测试技术研究所 | A kind of small-sized electromagnetic interface filter device inhibiting spike noise |
| CN107708398A (en) * | 2017-10-12 | 2018-02-16 | 四川中光防雷科技股份有限公司 | A kind of high reliability EMI filtration modules |
| CN108155888A (en) * | 2018-01-05 | 2018-06-12 | 北京航天微电科技有限公司 | A kind of LTCC heavy EMI filters for powered electromagnetic to be inhibited to interfere |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105162431B (en) | 2017-12-29 |
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Address after: 100854 Beijing Haidian District Beijing 142 mail box 85 boxes Patentee after: Beijing Aerospace Micro Electric Technology Co., Ltd. Address before: 100854 Beijing Haidian District Beijing 142 mail box 85 boxes Patentee before: Beijing Changfeng Micro-Electronics Technology Co., Ltd. |