CN201956156U - Filter - Google Patents
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- CN201956156U CN201956156U CN2011200374228U CN201120037422U CN201956156U CN 201956156 U CN201956156 U CN 201956156U CN 2011200374228 U CN2011200374228 U CN 2011200374228U CN 201120037422 U CN201120037422 U CN 201120037422U CN 201956156 U CN201956156 U CN 201956156U
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Abstract
The utility model discloses a filter, relating to the technical field of electromagnetic compatibility. The filter provided by the utility model comprises two magnetic cores, two groups of coils and a magnetic core base; the two magnetic cores are arranged opposite to each other; the two groups of coils are arranged between the two magnetic cores to form a common-mode magnetic circuit and a differential-mode circuit; and the bottom ends of the two magnetic cores are fixed on the magnetic core base, and the input/output pipe pins of the two groups of coils are led out through the magnetic core base. By adopting the utility model, the production complexity and the production cost of the filter are decreased, and the space for printed circuit boards can be greatly saved.
Description
Technical field
The utility model relates to the electromagnetic compatibility technology field, relates in particular to a kind of filter that can suppress differential mode electromagnetic interference and common mode electromagnetic interference simultaneously.
Background technology
At present, in including power electronic product such as Switching Power Supply, uninterrupted power supply and frequency converter or device, because it is operated on off state, can produce electromagnetic interference signal inevitably, therefore, Electro Magnetic Compatibility (Electro Magnetic Compatibility is called for short EMC) design at power electronic product or device then seems particularly important.Wherein, the electromagnetic interference that needs in the described electromagnetic Compatibility Design to consider (Electromagnetic Interference is called for short EMI) mainly is divided into: differential mode electromagnetic interference signal and common mode electromagnetic interference signal.These interference signals not only influence the operate as normal of circuit self, also can enter electrical network in the mode of conduction and radiation, pollute other equipment; Owing to also have electromagnetic interference signal inevitably in the electrical network, influence the operate as normal of equipment simultaneously, therefore must take corresponding way to suppress these interference signals.
In the design of existing EMC, use always and respectively common mode electromagnetic interference signal and differential mode electromagnetic interference signal are carried out filtering to common mode inductance and differential mode inductance.Common mode inductance is for the common mode electromagnetic interference signal, and the flow direction that coil as shown in Figure 1 produces is identical, and the effect of mutual reinforcement is arranged, thereby the coil common code impedance improves, and common mode current weakens greatly.And for the differential mode electromagnetic interference signal, the coil differential-mode current produces the opposite magnetic flux of direction in magnetic core as shown in Figure 2, and magnetic flux is cancelled out each other, and makes that magnetic flux is near zero in the magnetic core, and coil inductance is almost nil, so it can not suppress the differential mode electromagnetic interference signal.But in practice, also there are differential mode inductance composition, coil as shown in Figure 3 in the common mode inductance, be equivalent to have two differential mode inductance L1 and L2 in the common mode inductance, their magnetic circuit opposite magnetic flux as shown in Figure 3, the air gap of L1 is Lg1, the air gap of L2 is Lg2.Because air gap Lg1 and Lg2 are bigger, the differential mode inductance in the common mode inductance is very little, can not satisfy the differential mode inductance amount of filtering differential mode electromagnetic interference signal needs, therefore, needs extra differential mode inductance to come filtering differential mode electromagnetic interference signal in the prior art.
Like this, state common mode inductance and differential mode inductance in realization and respectively common mode electromagnetic interference signal and differential mode electromagnetic interference signal are carried out in the process of filtering, utility model people finds that there are the following problems at least in the prior art:
By common mode inductance filtering common mode electromagnetic interference signal, the filtering mode relative complex and the cost of differential mode inductance filtering differential mode electromagnetic interference signal are higher in the prior art, and the space that takies printed circuit board (PrintedCircuitBoard is called for short PCB) is bigger.
The utility model content
Embodiment of the present utility model provides a kind of filter, can suppress common mode electromagnetic interference signal and differential mode electromagnetic interference signal simultaneously.For achieving the above object, embodiment of the present utility model adopts following technical scheme:
A kind of filter comprises: two magnetic cores, two groups of coils and a magnetic core base; Described two magnetic cores are provided with in opposite directions; Described two groups of coils are arranged between described two magnetic cores, form common mode magnetic circuit and differential mode magnetic circuit; The bottom of described two magnetic cores is fixed on the magnetic core base, and the input and output pin of described two groups of coils is drawn by the magnetic core base.
Further, the top of described magnetic core is the boss shape; The inboard on described boss shape top is provided with two key shape projectioies; Two key shape projectioies that are provided with on described two magnetic cores are connected to form described common mode magnetic circuit in opposite directions; Air gap between boss shape top that is provided with on described two magnetic cores and described boss shape top forms described differential mode magnetic circuit.
Further, described key shape projection is the key shape boss of surface smoothing.
Further, described magnetic core base is provided with location hole; The input and output pin of described two groups of coils is drawn by the location hole of magnetic core base.
Further, described magnetic core adopts the ferrite material; Described magnetic core base adopts the insulation material.
Further, the both sides between described magnetic core top and the bottom also are provided with two draw-in grooves, and described draw-in groove is used for described two magnetic cores are fixed together.
Further, described coil is an air core coil, and the outward flange of the key shape projection of the internal diameter of coil and described magnetic core is complementary; Described coil is set between the described magnetic core key shape projection that is provided with in opposite directions.
Further, described two groups of coils adopt flat coiling.
Further, described two groups of coils adopt the grooved flatwise coil.
Further, the direction of winding of described two groups of coils is opposite.
Two magnetic cores are provided with in opposite directions in a kind of filter that the utility model embodiment provides; Two groups of coils are arranged between described two magnetic cores, form common mode magnetic circuit and differential mode magnetic circuit; The bottom of described two magnetic cores is fixed on the magnetic core base, and the input and output pin of described two groups of coils is drawn by the magnetic core base.The filtering that the utility model is realized the common mode electromagnetic interference signal simultaneously by the common mode magnetic circuit and the differential mode magnetic circuit of described formation and the filtering of differential mode electromagnetic interference signal, with two inductance of use in the prior art, be that common mode inductance carries out filtering to common mode electromagnetic interference signal and differential mode electromagnetic interference signal respectively with differential mode inductance and compares, the utility model only can be realized the filter function of above-mentioned common mode electromagnetic interference signal and differential mode electromagnetic interference signal by a filter, thereby greatly reduce the complexity and the production cost of production, and can save the printed circuit board space greatly.
Description of drawings
Fig. 1 is the magnetic flux schematic diagram of common mode current in toroidal core in the prior art;
Fig. 2 is the magnetic flux schematic diagram of differential-mode current in toroidal core in the prior art;
Fig. 3 is magnetic flux and the air gap schematic diagram of differential-mode current in the toroidal core of common mode inductance in the prior art;
The stereogram of a kind of filter that Fig. 4 provides for the utility model embodiment;
The internal structure schematic diagram of a kind of filter that Fig. 5 provides for the utility model embodiment;
The coiling schematic diagram of a kind of filter coil that Fig. 6 provides for the utility model embodiment.
Description of reference numerals
1, magnetic core;
2, magnetic core key shape projection;
3, magnetic core base;
4, magnetic core boss shape top;
5, coil;
6, draw-in groove.
Embodiment
, be described in detail a kind of filter that the utility model embodiment provides below in conjunction with accompanying drawing.
As shown in Figure 4, a kind of filter construction schematic diagram that provides for the utility model embodiment; This filter comprises: two magnetic cores 1, two groups of coils 5 and magnetic core bases 3; Described two magnetic cores 1 are provided with in opposite directions; Described two groups of coils 5 are arranged between described two magnetic cores, form common mode magnetic circuit and differential mode magnetic circuit; The bottom of described two magnetic cores is fixed on the magnetic core base 3, and the input and output pin of described two groups of coils 5 is drawn by magnetic core base 3.
Wherein, the top 4 of described magnetic core is the boss shape as shown in Figure 5; The inboard on described boss shape top is provided with two key shape projectioies 2; Two key shape projectioies 2 that are provided with on described two magnetic cores are connected to form described common mode magnetic circuit in opposite directions; Air gap Lg3 between boss shape top 4 that is provided with on described two magnetic cores and described boss shape top forms described differential mode magnetic circuit.
Need to prove that two key shape projectioies 2 that are provided with on described two magnetic cores are connected to form described common mode magnetic circuit in opposite directions, compared with prior art, are equivalent to common mode inductance, are used for filtering common mode electromagnetic interference signal; Air gap Lg 3 between boss shape top 4 that is provided with on described two magnetic cores and described boss shape top forms described differential mode magnetic circuit, compared with prior art, is equivalent to differential mode inductance, is used for filtering differential mode electromagnetic interference signal.In the prior art, the differential mode inductance in the annular as shown in Figure 3 common mode inductance, because its air gap Lg1, Lg2 is bigger, so differential mode inductance is less, and the differential mode inductance that needs in the reality is bigger.Like this, the differential mode inductance that produces in the existing annular common mode inductance can't satisfy the demand of filtering differential mode electromagnetic interference signal, the utility model is exactly the filter that has proposed a kind of integrated differential mode inductance and common mode inductance at this problem, and this filter can be realized filtering differential mode electromagnetic interference signal and two kinds of functions of common mode electromagnetic interference signal simultaneously.
The main feature of the utility model median filter is described differential mode magnetic circuit, and the air gap Lg3 of described differential mode magnetic circuit can select the height of magnetic core top boss according to the needs of actual conditions, thereby can adjust the size of air gap Lg3.Like this, because the air gap Lg3 in the differential mode magnetic circuit is less, the differential mode inductance amount is bigger, thus effective filtering differential mode electromagnetic interference signal just.
Wherein, described key shape projection is the key shape boss of surface smoothing.
Wherein, described magnetic core adopts the ferrite material; Described magnetic core base adopts the insulation material.
Wherein, described magnetic core base 3 is provided with location hole; The input and output pin of described two groups of coils is drawn by the location hole of magnetic core base 3.
Wherein, the both sides between described magnetic core top and the bottom also are provided with two draw-in grooves 6, and described draw-in groove 6 is used for described two magnetic cores 1 are fixed together.
Wherein, described coil 5 is an air core coil, and the outward flange of the key shape projection 2 of the internal diameter of coil 5 and described magnetic core 5 is complementary; Described coil 5 is set between the described magnetic core key shape projection 2 that is provided with in opposite directions.
Wherein, described two groups of coils 5 adopt flat coiling as shown in Figure 6, and described two groups of coils 5 adopt the grooved flatwise coil; The direction of winding of described two groups of coils is opposite.
Need to prove that compare with the coil of artificial coiling annular magnet ring in the prior art, employed coil can adopt Winder to carry out the batch coiling in the utility model, thereby can improve speed of production greatly, reduces production costs; Can also adopt flat coiling or banded coiling to come coiling in the utility model, make that coiling density is higher, reduce the space hold amount greatly.
The above coiling not only is confined to copper coiling or copper strips coiling, can also select other unlike materials according to actual conditions.
Two magnetic cores are provided with in opposite directions in a kind of filter that the utility model embodiment provides; Two groups of coils are arranged between described two magnetic cores, form common mode magnetic circuit and differential mode magnetic circuit; The bottom of described two magnetic cores is fixed on the magnetic core base, and the input and output pin of described two groups of coils is drawn by the magnetic core base.The filtering that the utility model is realized the common mode electromagnetic interference signal simultaneously by the common mode magnetic circuit and the differential mode magnetic circuit of described formation and the filtering of differential mode electromagnetic interference signal, with two inductance of use in the prior art, be that common mode inductance carries out filtering to common mode electromagnetic interference signal and differential mode electromagnetic interference signal respectively with differential mode inductance and compares, the utility model only can be realized the filter function of above-mentioned common mode electromagnetic interference signal and differential mode electromagnetic interference signal by a filter, thereby greatly reduce the complexity and the production cost of production, and can save the printed circuit board space greatly.
The above; it only is embodiment of the present utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion by described protection range with claim.
Claims (10)
1. a filter is characterized in that, comprising: two magnetic cores, two groups of coils and a magnetic core base; Described two magnetic cores are provided with in opposite directions; Described two groups of coils are arranged between described two magnetic cores, form common mode magnetic circuit and differential mode magnetic circuit; The bottom of described two magnetic cores is fixed on the magnetic core base, and the input and output pin of described two groups of coils is drawn by the magnetic core base.
2. filter according to claim 1 is characterized in that, the top of described magnetic core is the boss shape; The inboard on described boss shape top is provided with two key shape projectioies; Two key shape projectioies that are provided with on described two magnetic cores are connected to form described common mode magnetic circuit in opposite directions; Air gap between boss shape top that is provided with on described two magnetic cores and described boss shape top forms described differential mode magnetic circuit.
3. filter according to claim 2 is characterized in that, described key shape projection is the key shape boss of surface smoothing.
4. filter according to claim 3 is characterized in that, described magnetic core adopts the ferrite material; Described magnetic core base adopts the insulation material.
5. filter according to claim 4 is characterized in that, described magnetic core base is provided with location hole; The input and output pin of described two groups of coils is drawn by the location hole of magnetic core base.
6. filter according to claim 5 is characterized in that, the both sides between described magnetic core top and the bottom also are provided with two draw-in grooves, and described draw-in groove is used for described two magnetic cores are fixed together.
7. according to any described filter in the claim 3 to 6, it is characterized in that described coil is an air core coil, and the outward flange of the key shape projection of the internal diameter of coil and described magnetic core is complementary; Described coil is set between the described magnetic core key shape projection that is provided with in opposite directions.
8. filter according to claim 7 is characterized in that, described two groups of coils adopt flat coiling.
9. filter according to claim 8 is characterized in that, described two groups of coils adopt the grooved flatwise coil.
10. filter according to claim 9 is characterized in that the direction of winding of described two groups of coils is opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200374228U CN201956156U (en) | 2011-02-14 | 2011-02-14 | Filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200374228U CN201956156U (en) | 2011-02-14 | 2011-02-14 | Filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201956156U true CN201956156U (en) | 2011-08-31 |
Family
ID=44500260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200374228U Expired - Lifetime CN201956156U (en) | 2011-02-14 | 2011-02-14 | Filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201956156U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594284A (en) * | 2012-02-22 | 2012-07-18 | 南京航空航天大学 | Plane electro-magnetic interference (EMI) filter formed by multi-coil integrated LC unit |
| CN102638158A (en) * | 2011-02-14 | 2012-08-15 | 北京科耐特科技有限公司 | Filter |
-
2011
- 2011-02-14 CN CN2011200374228U patent/CN201956156U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638158A (en) * | 2011-02-14 | 2012-08-15 | 北京科耐特科技有限公司 | Filter |
| CN102594284A (en) * | 2012-02-22 | 2012-07-18 | 南京航空航天大学 | Plane electro-magnetic interference (EMI) filter formed by multi-coil integrated LC unit |
| CN102594284B (en) * | 2012-02-22 | 2015-07-01 | 南京航空航天大学 | Plane electro-magnetic interference (EMI) filter formed by multi-coil integrated LC unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Anhui Dynamic Power Co., Ltd. Assignor: Beijing Kennett Science & Technology Co., Ltd. Contract record no.: 2012340000066 Denomination of utility model: Filter and its making method Granted publication date: 20110831 License type: Exclusive License Record date: 20120326 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110831 |
|
| CX01 | Expiry of patent term |