CN103618516A - Emi filter - Google Patents
Emi filter Download PDFInfo
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- CN103618516A CN103618516A CN201310567559.8A CN201310567559A CN103618516A CN 103618516 A CN103618516 A CN 103618516A CN 201310567559 A CN201310567559 A CN 201310567559A CN 103618516 A CN103618516 A CN 103618516A
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- shell
- electromagnetic interface
- interface filter
- pin
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Abstract
The invention relates to an EMI filter. The EMI filter comprises a sealed outer shell, a filtering body fixed inside the outer shell and pins, wherein the pins are fixed on the outer side of the outer shell and are electrically connected with the filtering body, the space among the interior of the outer shell, the filtering body and the outer shell is filled with heat dissipating silica gel. According to the EMI filter, the heat dissipating silica gel inside the outer shell can fast transmit the heat produced by the filtering body to the outer shell, and accordingly a good heat dissipating effect is obtained.
Description
Technical field
The present invention relates to a kind of minimizing and exchange the device that inputs or outputs harmonic components, particularly relate to a kind of electromagnetic interface filter.
Background technology
Electromagnetic interface filter is a kind of low pass filter being comprised of inductance and electric capacity, and it can allow the useful signal of low frequency pass through smoothly, and High-frequency Interference is had to inhibitory action.
Military Power electromagnetic interface filter requires product to seal, and volume is little, can bear large electric current, and this just easily causes electromagnetic interface filter affect device lifetime, even inefficacy because of overheated.
Summary of the invention
Based on this, be necessary for traditional electromagnetic interface filter because the large overheated problem causing of electric current provides the electromagnetic interface filter that a kind of thermal diffusivity is good.
A kind of electromagnetic interface filter, the shell that comprises sealing, be fixed on the filtering body in shell, and be fixed on the outside of shell the pin being electrically connected with described filtering body, fill by thermal grease in the space between described enclosure, filtering body and shell.
In an embodiment, the material of described shell and pin is kovar alloy therein.
In an embodiment, the kovar alloy of described shell and pin is dual electroplating anticorrosion arbor gold-plated after first nickel plating therein.
In an embodiment, described pin is round pin therein, and cross section is circular or oval.
In an embodiment, described filtering body comprises inductor, capacitor and connects the internal connection line of described inductor and capacitor therein; Described inductor comprises the coil of glasses type structure, and the coil of described glasses type structure comprises each connecting line that is set in the coil on magnetic core and connects these two coils of left and right, and the coil of described glasses type structure adopts litz wire to carry out boxing.
In an embodiment, described inductor also comprises the internal electrical sensor coil that adopts shell pin straight forming therein, and described internal electrical sensor coil is located at magnetic core inside.
In an embodiment, described capacitor is feedthrough capacitor therein, and described feedthrough capacitor adopts groove type erection welding, at the interior end of shell, offers groove, and described feedthrough capacitor is welded in groove, forms good contact weld with shell.
In an embodiment, also comprise the insulator that connects described pin and shell therein, described insulator is glass material.
In an embodiment, the packaged type of described shell is parallel seam welding, during encapsulation, first vacuumizes and encapsulates therein.
Therein in an embodiment, the components and parts of described filtering body are for vertically to install perpendicular to outer casing bottom, and part components and parts are in the horizontal direction towards identical, another part components and parts in the horizontal direction perpendicular to described towards identical components and parts.
The thermal grease that above-mentioned electromagnetic interface filter is filled in enclosure can conduct to rapidly shell by the heat of filtering body generation, thereby obtains preferably radiating effect.
Accompanying drawing explanation
Fig. 1 is the front view of electromagnetic interface filter in an embodiment;
Fig. 2 is the left view of electromagnetic interface filter shown in Fig. 1;
Fig. 3 is the internal structure schematic diagram of electromagnetic interface filter in 1 one embodiment;
Fig. 4 is the moulding figure of the inductor coil of glasses type structure.
Embodiment
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.In accompanying drawing, provided first-selected embodiment of the present invention.But the present invention can realize in many different forms, be not limited to embodiment described herein.On the contrary, providing the object of these embodiment is to make to disclosure of the present invention more thoroughly comprehensively.
It should be noted that, when element is called as " being fixed on " another element, can directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may have centering elements simultaneously.Term as used herein " vertical ", " level ", " left side ", " right side " and similar statement are just for illustrative purposes.
Unless otherwise defined, all technology of using are herein identical with the implication that belongs to the common understanding of those skilled in the art of the present invention with scientific terminology.The term using in specification of the present invention herein, just in order to describe the object of specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise one or more relevant Listed Items arbitrarily with all combinations.
Electromagnetic interface filter of the present invention adopts brand-new design concept and structure, object is by improving the aspects such as material, technique and project organization, improve reliability, environmental suitability, electrical property and the technique operability of filter, enable to meet the demand of the Military Power electromagnetic interface filter of large electric current.
Refer to Fig. 1 and Fig. 2, electromagnetic interface filter comprises the shell 10 of sealing, is fixed on the filtering body in shell 10, and is fixed on the outside of shell 10 pin being electrically connected with filtering body.Referring to Fig. 1, pin 1 represents that filter input is anodal, and pin 2 represents filter output cathode, and pin 3 represents filter input negative pole, and pin G represents the output negative pole of filter ground connection, and 4 pins are foursquare 4 summits and distribute.Referring to Fig. 3, filtering body comprises inductor 22, capacitor 26 and the internal connection line 24 that connects inductor 22 and capacitor 26.Fill by thermal grease 28 in space between the inside of shell 10, filtering body and shell 10.
The electromagnetic interface filter volume that seals in the present embodiment little (referring to table 1, wherein D is the distance between the adjacent two pins that do not indicate of accompanying drawing), inner space is 12*11*8mm, and need to lead to large electric current, therefore heat dissipation problem is comparatively outstanding.The heat that adopts thermal grease that filtering body is produced conducts to rapidly shell, can obtain preferably radiating effect.
Table 1
For further improving radiating effect, shell 10 and pin adopt kovar alloy (KOVAR) material, replace traditional shell of moulding to encapsulate.Concrete employing is preferably 4J29 material of thermal diffusivity in the present embodiment.
For solving the overheated problem of large electric current, except from strengthening the angle of heat radiation, can also design from reducing the angle of heating.Please refer to Fig. 4, inductor comprises the coil of glasses type structure as shown in Figure 4, also comprises the internal electrical sensor coil that adopts shell pin straight forming.The coil of glasses type structure comprises each coil being set on magnetic core of left and right, and connects the connecting line of these two coils.The coil of glasses type structure adopts litz wire to carry out boxing, during high frequency, can reduce skin effect, reduces resistance loss heating.
For meeting the demand of war products, electromagnetic interface filter of the present invention need to have good environmental suitability.Common filter adopts conventionally moulds shell encapsulation, and Material degradation in high temperature, high humidity environment, easily causes filter operation irregularity; Pin corrosion-vulnerable fracture in salt mist environmental test; Filter poor sealing performance, external humidification and corrosive liquid easily enter filter inside, and its working life is reduced.
In order to solve common filter tenable environment bad adaptability, easily make moist, the stitch fracture that is corroded after salt mist test, the problem of poor sealing performance, the shell 10 of electromagnetic interface filter and pin be as aforementioned employing kovar alloy material, and adopt the mode of dual plating, gold-plated after first nickel plating.For reducing residual on pin of corrosive liquid in salt mist environment, adopt round pin, cross section, for circular or be similar to the column pin of circle (such as ellipse), substitutes the flat pin of conventional filter.Adopt the electromagnetic interface filter of said structure and material to have no corrosion through 96 hours salt mist tests.
The insulator that connects pin and shell 10 adopts glass material, substitutes traditional ceramic material.Ceramic material generally more crisp, have cavity, and glass after high temperature sintering without cavity, good mechanical property, and shell can combine closely, sealing property can reach airtight rank.In addition, the encapsulation of shell 10 adopts the packaged type of parallel seam welding, during encapsulation, first vacuumizes and encapsulates, and further guarantees the reliability of product.
The inductor coil of the glasses type structure shown in Fig. 4, two coil being just inserted on magnetic core can be used as a tool high frequency magnetic bead use, High-frequency Interference is had to good inhibitory action, and adopt litz wire to carry out boxing, makes high frequency Insertion Loss can reach requirement.
As aforementioned, electromagnetic interface filter also comprises an internal electrical sensor coil that adopts shell pin straight forming, and this inductor coil is designed at magnetic core innerly, and in the time of can reducing high frequency, coil transmits and receives.Each components and parts of filtering body adopt the vertical mounting means perpendicular to shell 10 bottoms as shown in Figure 3, part components and parts are in the horizontal direction towards identical, all the other components and parts, in the horizontal direction perpendicular to these components and parts above, can prevent that inner components and parts from producing high-frequency coupling like this.
Capacitor 26 is feedthrough capacitor, and feedthrough capacitor adopts groove type erection welding.Particularly, at the interior end of shell 10, offer groove, feedthrough capacitor is welded in groove, forms good contact weld, thereby can reduce alternating-current resistance with shell, meets the performance requirement of high frequency band.
Adopt the suppressing bandwidth of the electromagnetic interface filter of said structure and technique can reach 100KHz-2GHz, and be less than-40dB of Insertion Loss, higher than the 100KHz-1GHz of external equivalents.
Above-mentioned electromagnetic interface filter has improved the scope of application of filter product, has increased the reliability of product.And improved the blanketing frequency scope of electromagnetic interface filter, surpassed the index of external advanced manufacturer, made domestic filter product production domesticization reach a new step.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. an electromagnetic interface filter, the shell that comprises sealing, is fixed on the filtering body in shell, and is fixed on the outside of shell the pin being electrically connected with described filtering body, it is characterized in that, fill by thermal grease in the space between the inside of described shell, filtering body and shell.
2. electromagnetic interface filter according to claim 1, is characterized in that, the material of described shell and pin is kovar alloy.
3. electromagnetic interface filter according to claim 2, is characterized in that, the kovar alloy of described shell and pin is dual electroplating anticorrosion arbor gold-plated after first nickel plating.
4. electromagnetic interface filter according to claim 1, is characterized in that, described pin is round pin, and cross section is circular or oval.
5. electromagnetic interface filter according to claim 1, is characterized in that, described filtering body comprises inductor, capacitor and connects the internal connection line of described inductor and capacitor; Described inductor comprises the coil of glasses type structure, and the coil of described glasses type structure comprises each connecting line that is set in the coil on magnetic core and connects these two coils of left and right, and the coil of described glasses type structure adopts litz wire to carry out boxing.
6. electromagnetic interface filter according to claim 5, is characterized in that, described inductor also comprises the internal electrical sensor coil that adopts shell pin straight forming, and described internal electrical sensor coil is located at magnetic core inside.
7. electromagnetic interface filter according to claim 5, is characterized in that, described capacitor is feedthrough capacitor, described feedthrough capacitor adopts groove type erection welding, the interior end at shell offers groove, and described feedthrough capacitor is welded in groove, forms good contact weld with shell.
8. electromagnetic interface filter according to claim 1, is characterized in that, also comprises the insulator that connects described pin and shell, and described insulator is glass material.
9. electromagnetic interface filter according to claim 1, is characterized in that, the packaged type of described shell is parallel seam welding, during encapsulation, first vacuumizes and encapsulates.
10. according to the electromagnetic interface filter described in any one in claim 1-9, it is characterized in that, the components and parts of described filtering body are for vertically to install perpendicular to outer casing bottom, part components and parts are in the horizontal direction towards identical, another part components and parts in the horizontal direction perpendicular to described towards identical components and parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310567559.8A CN103618516A (en) | 2013-11-14 | 2013-11-14 | Emi filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310567559.8A CN103618516A (en) | 2013-11-14 | 2013-11-14 | Emi filter |
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| Publication Number | Publication Date |
|---|---|
| CN103618516A true CN103618516A (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310567559.8A Pending CN103618516A (en) | 2013-11-14 | 2013-11-14 | Emi filter |
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| CN (1) | CN103618516A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107734930A (en) * | 2017-10-23 | 2018-02-23 | 成都旭思特科技有限公司 | Wave filter with moisture proof function |
| CN109906001A (en) * | 2018-12-25 | 2019-06-18 | 成都燎原星光电子有限责任公司 | A kind of power-supply filter and power-supply filter assembly method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1465130A (en) * | 2001-06-29 | 2003-12-31 | 薛承基 | Active common mode emi filter mitigating conducted electromagnetic interference |
| US20040257747A1 (en) * | 2003-05-23 | 2004-12-23 | Stevenson Robert A. | Inductor capacitor EMI filter for human implant applications |
| CN101409136A (en) * | 2008-07-24 | 2009-04-15 | 艾默生网络能源有限公司 | EMI filter and switch power source |
| CN201274209Y (en) * | 2008-08-28 | 2009-07-15 | 台达电子工业股份有限公司 | Filter assembly |
| CN102360727A (en) * | 2011-11-10 | 2012-02-22 | 唐山尚新融大电子产品有限公司 | Plane magnetic integrated electro magnetic interference (EMI) filter |
| CN203554394U (en) * | 2013-11-14 | 2014-04-16 | 深圳振华富电子有限公司 | EMI filter |
-
2013
- 2013-11-14 CN CN201310567559.8A patent/CN103618516A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1465130A (en) * | 2001-06-29 | 2003-12-31 | 薛承基 | Active common mode emi filter mitigating conducted electromagnetic interference |
| US20040257747A1 (en) * | 2003-05-23 | 2004-12-23 | Stevenson Robert A. | Inductor capacitor EMI filter for human implant applications |
| CN101409136A (en) * | 2008-07-24 | 2009-04-15 | 艾默生网络能源有限公司 | EMI filter and switch power source |
| CN201274209Y (en) * | 2008-08-28 | 2009-07-15 | 台达电子工业股份有限公司 | Filter assembly |
| CN102360727A (en) * | 2011-11-10 | 2012-02-22 | 唐山尚新融大电子产品有限公司 | Plane magnetic integrated electro magnetic interference (EMI) filter |
| CN203554394U (en) * | 2013-11-14 | 2014-04-16 | 深圳振华富电子有限公司 | EMI filter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107734930A (en) * | 2017-10-23 | 2018-02-23 | 成都旭思特科技有限公司 | Wave filter with moisture proof function |
| CN109906001A (en) * | 2018-12-25 | 2019-06-18 | 成都燎原星光电子有限责任公司 | A kind of power-supply filter and power-supply filter assembly method |
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Application publication date: 20140305 |