CN202905391U - Common mode inductor - Google Patents
Common mode inductor Download PDFInfo
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- CN202905391U CN202905391U CN 201220497689 CN201220497689U CN202905391U CN 202905391 U CN202905391 U CN 202905391U CN 201220497689 CN201220497689 CN 201220497689 CN 201220497689 U CN201220497689 U CN 201220497689U CN 202905391 U CN202905391 U CN 202905391U
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- common mode
- magnetic core
- single magnetic
- mode inductance
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Abstract
The utility model relates to a common mode inductor which comprises a magnetic core with a coil, wherein the magnetic core is at least composed of two magnetic core units being in parallel connection and made of different magnetic conductive materials. The magnetic conductive materials of the magnetic core units could be any two of amorphous, nanocrystalline alloy, manganese zinc ferrite, nickel zinc ferrite, iron dust core, sendust Core, high magnetic flux powder core and permalloy. Since the magnetic core is formed by magnetic core units made of different magnetic conductive materials and wound with a coil after the magnetic core units are connected parallelly, the sensitive quality and bandwidth of the common mode inductor are greater than those of a common mode inductor made of single material and being same in the number of turns. Moreover, the common mode inductor suppresses electromagnetic interference of high and low frequencies, thereby reaching the desirable anti-electromagnetic interference effect.
Description
Technical field
The utility model relates to electronic technology field, more particularly, relates to a kind of common mode inductance.
Background technology
Along with development and the product extensive use of power electronics and information technology, the problem of electromagnetic interference (Electro-Magnetic Interference, EMI) is increasingly serious.For example mixed various high-frequency circuits, digital circuit and analog circuit on the mainboard of computer-internal, can produce a large amount of frequency electromagnetic waves during their work and interfere with each other.Electromagnetic interference also can outwards be launched by mainboard wiring or external cable, causes electromagnetic radiation pollution, not only affects other electronic equipment normal operation, and is also harmful.
In order to eliminate the interference signal inputted on the electronic circuit holding wire and the various interference of induction, must the appropriate design filter circuit suppress the interference of common and different mode, common mode inductance is exactly a part in the filter circuit.Common mode inductance is in fact a bidirectional filter: want common mode electromagnetic interference on the filtered signal line on the one hand, electromagnetic interference is not outwards sent in inhibition itself again on the other hand, avoids affecting the normal operation of other electronic equipments under the same electromagnetic environment.In Mathematical Modeling, desirable common mode inductance can have higher impedance at full frequency band.In actual applications, because the characteristic that the magnetic permeability of common mode inductance core material descends with frequency, cause common mode inductance only in limited frequency range, to present inductive, and can not suppress simultaneously the electromagnetic interference of low-and high-frequency, therefore can't reach the anti-electromagnetic interference effect of expection.
The utility model content
The technical problems to be solved in the utility model is, for the defects of prior art, provide a kind of under the identical number of turn sensibility reciprocal higher, have a wider common mode inductance of inductive frequency band.
The technical scheme that its technical problem that solves the utility model adopts is:
Construct a kind of common mode inductance, comprise the magnetic core that is provided with coil, wherein, described magnetic core is composed in parallel by at least two single magnetic cores, wherein has at least two described single magnetic cores to adopt not identical permeability magnetic material to make.
Common mode inductance described in the utility model, wherein, the permeability magnetic material that consists of described single magnetic core is at least two kinds arbitrarily in amorphous, nanometer crystal alloy, manganese-zinc ferrite, nickel-zinc ferrite, ferrocart core, iron Si-Al Magnetic Powder Core, high magnetic flux powder core and the permalloy.
Common mode inductance described in the utility model, wherein, described magnetic core comprises two described single magnetic cores.
Common mode inductance described in the utility model, wherein, two described single magnetic cores adopt respectively amorphous and nickel-zinc ferrite to make.
Common mode inductance described in the utility model, wherein, two described single magnetic cores adopt respectively amorphous and manganese-zinc ferrite to make.
Common mode inductance described in the utility model, wherein, described magnetic core comprises three described single magnetic cores.
Common mode inductance described in the utility model, wherein, three described single magnetic cores adopt respectively amorphous, nickel-zinc ferrite and manganese-zinc ferrite to make.
Common mode inductance described in the utility model, wherein, the coiling of described coil employing order winding mode.
Common mode inductance described in the utility model, wherein, at least two described single magnetic cores are annular or square;
When described single magnetic core was annular, wherein the internal diameter difference of any two described single magnetic cores and external diameter difference were respectively less than 5mm;
When being square, wherein the peripheral lengths difference of any two described single magnetic cores, peripheral width difference, endoporus length difference and endoporus width difference are respectively less than 5mm at described single magnetic core.
Common mode inductance described in the utility model, wherein, at least two described single magnetic cores adopt bonding or the mode of tying up is connected in parallel.
Common mode inductance described in the utility model, wherein, at least two described single magnetic core parallel connections refer to: the magnetic circuit of each single magnetic core is parallel to each other.
The beneficial effects of the utility model are: consist of magnetic core by adopting two or more single magnetic core parallel connections that are made of different permeability magnetic materials, and on the magnetic core after the parallel connection coiling, formed common mode inductance is in sensibility reciprocal and the bandwidth of the common mode inductance of the identical number of turn that consists of greater than the magnetic core of any single material aspect sensibility reciprocal, the bandwidth, the electromagnetic interference that therefore can suppress simultaneously low-and high-frequency reaches the anti-electromagnetic interference effect of expection.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the common mode inductance front view of the utility model preferred embodiment;
Fig. 2 is the common mode inductance vertical view with two single magnetic cores of the utility model preferred embodiment;
Fig. 3 is the common mode inductance vertical view with three single magnetic cores of the utility model preferred embodiment;
Fig. 4 is the common mode inductance of single amorphous material, single manganese-zinc ferrite material and the common mode inductance sensibility reciprocal test data comparing result of the utility model preferred embodiment.
Embodiment
The common mode inductance of the utility model preferred embodiment as depicted in figs. 1 and 2, comprise the magnetic core 10 that is provided with coil 20, wherein, magnetic core 10 is composed in parallel by at least two single magnetic cores and (Figure 2 shows that the schematic diagram of two single magnetic core parallel connections, it comprises: the first single magnetic core 11 and the second single magnetic core 12), wherein have at least two single magnetic cores to adopt not identical permeability magnetic material to make (in this enforcement, the first single magnetic core 11 is made by different permeability magnetic materials respectively with the second single magnetic core 12).Therefore formed like this common mode inductance can suppress the electromagnetic interference of low-and high-frequency simultaneously in sensibility reciprocal and the bandwidth of the common mode inductance of the identical number of turn that consists of greater than any single material magnetic core aspect sensibility reciprocal, the bandwidth, reaches the anti-electromagnetic interference effect of expection.Concrete principle analysis is as follows.
The inductance value theoretical calculation formula of single magnetic core common mode inductance is:
L＝N
2*u
0*u
r*A
e/l
e （1），
In the above-mentioned formula (1), L represents inductance value, and N represents coil turn, u
0The expression permeability of vacuum, u
rExpression magnetic core relative permeability, A
eExpression magnetic core sectional area, l
eThe expression length of magnetic path.Wherein, because u
rDecay with the frequency increase, so u
rBe the function of frequency f, can be expressed as u
r(f).So the sensibility reciprocal L of single magnetic core common mode inductance also is the function of frequency f, can represent with following formula (2):
L(f)＝N
2*u
0*u
r(f)*A
e/l
e （2）。
In the present embodiment, because two single magnetic cores that adopt different permeability magnetic materials to consist of are composed in parallel magnetic core, inductance value L
Always(f) be the algebraical sum of 2 single magnetic core L (f), can represent with following formula (3):
L
Always(f)=L
1(f)+L
2(f) (3).
Can be found out by above-mentioned analysis, the common mode inductance in the present embodiment is in sensibility reciprocal and the bandwidth of the common mode inductance of the identical number of turn that consists of greater than any single material magnetic core aspect sensibility reciprocal, the bandwidth, and its sensibility reciprocal is higher, and frequency band is wider.
In above-described embodiment, two or more single magnetic core parallel connections refer to, the magnetic circuit of the single magnetic core that each is in parallel is parallel to each other.For example, for the single magnetic core of two or more annulars, its axis is on same straight line, and the toroid in each single magnetic core is parallel; For two or more square single magnetic cores, its long limit be arranged in parallel respectively and adjacent being in the same place with broadside, and the square magnetic circuit in each single magnetic core is parallel.
Preferably, in above-described embodiment, the material that consists of at least two single magnetic cores is at least two kinds arbitrarily in the permeability magnetic materials such as amorphous, nanometer crystal alloy, manganese-zinc ferrite, nickel-zinc ferrite, ferrocart core, iron Si-Al Magnetic Powder Core, high magnetic flux powder core and permalloy.
In a further embodiment, as depicted in figs. 1 and 2, magnetic core comprises the single magnetic core of two parallel connections.Preferably, two single magnetic cores are respectively and adopt the amorphous single magnetic core that consists of and the single magnetic core that adopts manganese-zinc ferrite to consist of.After tested, the interference band that the corresponding common mode inductance of magnetic core that adopts the single magnetic core parallel connection of these two kinds of materials to form afterwards can suppress is: 10～400kHz and 10～40MHz.Can solve low frequency conduction current emission and conduction emission problem, radiation-emitting is also had certain effect, especially more outstanding at army's mark, NEBS authenticated connection effect.
As shown in Figure 2, the below compares test to have the common mode inductance that adopts the first single magnetic core 11 that amorphous consists of and adopt the second single magnetic core 12 magnetic cores that form in parallel that manganese-zinc ferrite consists of as example with the amorphous common mode inductance of the identical number of turn and sensibility reciprocal and the bandwidth of manganese-zinc ferrite common mode inductance.Wherein, the first single magnetic core 11 that test is adopted is of a size of: 50mm*25mm*20mm, the second single magnetic core 12 is of a size of: 48mm*27mm*18mm, consist of and be provided with two windings on the magnetic core in parallel, each winding 9 circle coil, use Agilent E4980A LCR tester test inductance value, and compare with the amorphous common mode inductance of the identical number of turn and the inductance value of manganese-zinc ferrite common mode inductance.The correction data curve as shown in Figure 4, as can be seen from Figure 4, in 10kHz～400kHz frequency range, the common mode inductance of the present embodiment has higher sensibility reciprocal and bandwidth than traditional common mode inductance.
And in many international standards in EMC field, all require the low frequencies test, contained 10kHz(even lower) to this frequency range of 150kHz, the requirement of GR-1089-CORE current emission in for example RE101/RE102/CE101/CE102 in national military standard and the American army mark, and the North America NEBS system; Simultaneously these standards also require product to pass through 150kHz～30MHz to conduct transmission test.General electric series products is at 10～400kHz frequency range Electro Magnetic Compatibility (Electro MagneticCompatibility, EMC) problem is serious, and wherein EMC comprises two aspects: the equipment that refers on the one hand can not surpass certain limit value to the electromagnetic interference that the place environment produces in normal course of operation; Refer to that on the other hand utensil has to a certain degree immunity to interference, i.e. electromagnetic susceptibility to the electromagnetic interference that exists in the environment of place.Use the filter of single-stage common mode inductance to be difficult to the authentication by EMC, the filter that uses multistage common mode inductance again so that cost be difficult to bear.So on performance, above-described embodiment is better than the common mode inductance that single material magnetic core consists of in the frequency characteristic of 10～400kHz, and its cost and volume be again less than a plurality of common mode inductances, so it has very large advantage obtaining product E MC authenticated connection.
Perhaps, two single magnetic cores adopt respectively nickel-zinc ferrite and manganese-zinc ferrite to consist of.After tested, the interference band that the corresponding common mode inductance of magnetic core that adopts the single magnetic core parallel connection of these two kinds of materials to form afterwards can suppress is: 100～400kHz and 10～300MHz, can be used for solving conduction emission and radiation-emitting problem, favourable at EMC authenticated connections such as the CE that carries out the civil electrical product, CCC, C-tick.
Need to prove, the material that adopts of each single magnetic core can be selected suitable material according to its concrete performance requirement and applied environment in the present invention, can not limit protection range of the present utility model with concrete permeability magnetic material cited in above-described embodiment.
In a further embodiment, as shown in Figure 3, magnetic core 10 comprises the single magnetic core of three parallel connections.Preferably, three single magnetic cores adopt respectively amorphous, nickel-zinc ferrite and manganese-zinc ferrite to make.After tested, the interference band that the corresponding common mode inductance of magnetic core that adopts the single magnetic core parallel connection of these three kinds of materials to form afterwards can suppress is: 10kHz～300MHz.Owing to having used 3 single magnetic cores, its frequency bandwidth is wider, can be applied to the EMC scheme of various product, but is being inferior to above-mentioned embodiment with two single magnetic cores aspect volume and the process complexity.
The magnetic core constituted mode that is appreciated that two and three single magnetic cores of employing listed above only is used for explaining, and is not used in restriction this programme, can also obtain on this basis more constituted mode, does not enumerate one by one at this.
In the various embodiments described above, coil 20 winding methods on the magnetic core 10 can be: any in order winding mode, stepping winding mode and the overlapping winding mode.Wherein, the order coiling refers to: winding is the individual layer Spiral distribution along the outside in the magnetic core, and the hand of spiral does not change, and lead-in wire terminal and leading-out terminal are distributed in the winding two ends.Stepping coiling refers to: winding is at magnetic core outside monolayer distribution, in the magnetic core inboard since the 2nd circle whenever forward around a circle then to returning lap wound one circle, guarantee that lead-in wire terminal and leading-out terminal are distant.Overlapping coiling refers to: winding at the inboard first order of magnetic core coiling ground floor, then changes the hand of spiral to the second layer processed that unrolls at magnetic core outside monolayer distribution.
Owing to having turn-to-turn capacitance between the wire turn of winding, the lead-in wire terminal of winding and the nearlyer turn-to-turn capacitance of leading-out terminal distance are larger, and the frequency bandwidth of the larger then inductance of turn-to-turn capacitance is less.So obtain wider frequency characteristic, the two ends that will make winding as far as possible away from, and the order winding is best mode, if surpassing half inboard girth of magnet ring, the spiral span of winding just can use the stepping winding, the technique of banked winding is simpler than stepping winding, but turn-to-turn capacitance is greater than order, stepping winding.Therefore, in the various embodiments described above, preferred employing order winding mode.
In the various embodiments described above, as shown in Figure 1, at least two single magnetic cores are annular, perhaps are square (not shown).Preferably, when single magnetic core was annular, wherein the internal diameter difference of any two single magnetic cores and external diameter difference were respectively less than 5mm, and highly can equate also can be unequal; When being square, wherein the peripheral lengths difference of any two single magnetic cores, peripheral width difference, endoporus length difference and endoporus width difference are respectively less than 5mm at single magnetic core, and highly can equate also can be unequal.Wherein, the size of single magnetic core has comprised the size of the parts such as lacquer, containment vessel.
In the various embodiments described above, two single magnetic cores that consist of above-mentioned magnetic core 10 adopt bonding way to be connected in parallel, or adopt the mode of tying up to be connected in parallel.Be provided with at least two coils 20 windings at magnetic core 10, and each winding is made of a wire, or consisted of by the multiple conducting wires parallel connection.
In the various embodiments described above, common mode inductance can be vertical electric sense or horizontal inductance.Preferably, vertical inductance as depicted in figs. 1 and 2, magnetic core 10 and coil 20 are fixed on the same support 30, are provided with the pin 40 that is electrically connected with coil 20 at support 30.
In sum, the utility model is by adopting at least two single magnetic core parallel connections that are made of different permeability magnetic materials to consist of magnetic core 10, and on the magnetic core 10 after the parallel connection coiling 20, formed common mode inductance is in sensibility reciprocal and the bandwidth of the common mode inductance of the identical number of turn that consists of greater than any single material magnetic core aspect sensibility reciprocal, the bandwidth, the electromagnetic interference that therefore can suppress simultaneously low-and high-frequency reaches the anti-electromagnetic interference effect of expection.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (10)
1. a common mode inductance comprises the magnetic core that is provided with coil, it is characterized in that, described magnetic core is composed in parallel by at least two single magnetic cores, wherein has at least two described single magnetic cores to adopt not identical permeability magnetic material to make.
2. common mode inductance according to claim 1 is characterized in that, described magnetic core comprises two described single magnetic cores.
3. common mode inductance according to claim 2 is characterized in that, two described single magnetic cores adopt respectively amorphous and nickel-zinc ferrite to make.
4. common mode inductance according to claim 2 is characterized in that, two described single magnetic cores adopt respectively amorphous and manganese-zinc ferrite to make.
5. common mode inductance according to claim 1 is characterized in that, described magnetic core comprises three described single magnetic cores.
6. common mode inductance according to claim 5 is characterized in that, three described single magnetic cores adopt respectively amorphous, nickel-zinc ferrite and manganese-zinc ferrite to make.
7. each described common mode inductance in 6 according to claim 1 is characterized in that the coiling of described coil employing order winding mode.
8. each described common mode inductance in 6 according to claim 1 is characterized in that, at least two described single magnetic cores are annular or square;
When described single magnetic core was annular, wherein the internal diameter difference of any two described single magnetic cores and external diameter difference were respectively less than 5mm;
When being square, wherein the peripheral lengths difference of any two described single magnetic cores, peripheral width difference, endoporus length difference and endoporus width difference are respectively less than 5mm at described single magnetic core.
9. each described common mode inductance in 6 according to claim 1 is characterized in that, at least two described single magnetic cores adopt bonding or the mode of tying up is connected in parallel.
10. each described common mode inductance in 6 according to claim 1 is characterized in that, at least two described single magnetic core parallel connections refer to: the magnetic circuit of each single magnetic core is parallel to each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220497689 CN202905391U (en) | 2012-09-26 | 2012-09-26 | Common mode inductor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220497689 CN202905391U (en) | 2012-09-26 | 2012-09-26 | Common mode inductor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103680818A (en) * | 2013-12-31 | 2014-03-26 | 周涛 | Amorphous common mode inductor |
| CN105140003A (en) * | 2015-10-13 | 2015-12-09 | 东莞市昱懋纳米科技有限公司 | Composite common mode inductor magnetic core |
| CN106486261A (en) * | 2015-09-01 | 2017-03-08 | 乐金电子研发中心(上海)有限公司 | Integrated EMI inductance and the device of low frequency filtering inductance |
| CN106887299A (en) * | 2015-12-16 | 2017-06-23 | 莱尔德电子材料(深圳)有限公司 | Common mode choke including manganese-zinc ferrite and nickel-zinc ferrite |
| CN108010656A (en) * | 2017-10-30 | 2018-05-08 | 东莞市大忠电子有限公司 | A kind of high inductance core |
| CN110651338A (en) * | 2017-06-08 | 2020-01-03 | 阿莫绿色技术有限公司 | Laminated powder core |
| CN109817424B (en) * | 2017-11-22 | 2021-06-08 | 许继变压器有限公司 | Arc suppression coil winding method and arc suppression coil using same |
-
2012
- 2012-09-26 CN CN 201220497689 patent/CN202905391U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103680818A (en) * | 2013-12-31 | 2014-03-26 | 周涛 | Amorphous common mode inductor |
| CN103680818B (en) * | 2013-12-31 | 2016-04-20 | 湖北智权专利技术应用开发有限公司 | A kind of amorphous common mode inductance |
| CN106486261A (en) * | 2015-09-01 | 2017-03-08 | 乐金电子研发中心(上海)有限公司 | Integrated EMI inductance and the device of low frequency filtering inductance |
| CN105140003A (en) * | 2015-10-13 | 2015-12-09 | 东莞市昱懋纳米科技有限公司 | Composite common mode inductor magnetic core |
| CN106887299A (en) * | 2015-12-16 | 2017-06-23 | 莱尔德电子材料(深圳)有限公司 | Common mode choke including manganese-zinc ferrite and nickel-zinc ferrite |
| CN110651338A (en) * | 2017-06-08 | 2020-01-03 | 阿莫绿色技术有限公司 | Laminated powder core |
| CN110651338B (en) * | 2017-06-08 | 2021-07-20 | 阿莫绿色技术有限公司 | Laminated powder core |
| CN108010656A (en) * | 2017-10-30 | 2018-05-08 | 东莞市大忠电子有限公司 | A kind of high inductance core |
| CN109817424B (en) * | 2017-11-22 | 2021-06-08 | 许继变压器有限公司 | Arc suppression coil winding method and arc suppression coil using same |
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Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518055 No. 1001 Nanshan Chi Park B2 building 1-4 floor, building 6-10 Patentee after: VERTIV TECH Co.,Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: EMERSON NETWORK POWER Co.,Ltd. |
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Granted publication date: 20130424 |
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