CN202258647U - Common mode choke - Google Patents
Common mode choke Download PDFInfo
- Publication number
- CN202258647U CN202258647U CN2011203791374U CN201120379137U CN202258647U CN 202258647 U CN202258647 U CN 202258647U CN 2011203791374 U CN2011203791374 U CN 2011203791374U CN 201120379137 U CN201120379137 U CN 201120379137U CN 202258647 U CN202258647 U CN 202258647U
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- magnetic core
- common mode
- coils
- coil
- mode choke
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Abstract
The utility model relates to a common mode choke. The common mode choke comprises a magnetic core, two coils wound on the magnetic core and four terminals, wherein the two coils have the same size, the same number of turns and opposite winding directions; the magnetic core is a ferrite ring-shaped magnetic core; and the coils are insulated conductors and wound on the magnetic core in a single-layer manner. The common mode choke has low cost, can be efficiently wound by a machine, and is convenient to mount; and as an insulation layer is arranged between the magnetic core and the coils, the winding technology can be better controlled, and higher inductance can be made.
Description
Technical field
The utility model relates to a kind of inductance coil, especially a kind of common mode inductance.
Background technology
Inductance coil has the characteristic that suppresses the electric current variation, and bigger this effect of inductance is obvious more, and this effect is referred to as induction reactance to the inhibition of electric current, and the size of induction reactance is relevant with the size of the operating frequency of inductance and itself inductance.As far as desirable inductor models, when coil after intact, all magnetic fluxs all concentrate on coil in intracardiac.But generally loop coil can be around a full week, or coiling is not tight, can cause leakage of magnetic flux like this.Common mode inductance has two windings, and sizable gap is arranged therebetween, will produce flux leakage like this, and forms differential mode inductance.Differential mode inductance is by constituting around a coil on the iron core, so when the power supply that flows to coil increased, the iron core in the coil can be saturated.
The utility model content
The technical problem that the utility model will solve is: based on the problems referred to above, a kind of common mode inductance with certain DM EMI damping capacity is provided.
The utility model solves the technical scheme that its technical problem adopted: a kind of common mode inductance; Comprise a magnetic core, two coils and four terminals on this magnetic core; Described two coil dimension is identical, the number of turn is identical, coiling is in the opposite direction; Described magnetic core is the ferrite toroidal magnetic core, and described coil is an insulated conductor, and individual layer is around extremely on magnetic core.
Have a layer insulating between described magnetic core and the coil, under the instantaneous overvoltage effect, puncture between the two preventing.
The beneficial effect of the utility model is: the utility model cost is low, can be with the efficient coiling of machine, and easy for installation; Have a layer insulating between magnetic core and the coil, technique for coiling can better be controlled, and can do higher inductance value.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Fig. 1 is the structural representation of the utility model.
Among the figure: 1. magnetic core, 2. coil, 3. terminal.
Embodiment
Combine accompanying drawing that the utility model is done further detailed explanation now.These accompanying drawings are the sketch map of simplification, the basic structure of the utility model only is described in a schematic way, so it only show the formation relevant with the utility model.
A kind of common mode inductance as shown in Figure 1; Comprise that a magnetic core 1, two coils 2 on this magnetic core 1 and 3, two coils of four terminals are 2 measure-alike, the number of turn is identical, coiling is in the opposite direction, magnetic core 2 is the ferrite toroidal magnetic core; Coil 2 is an insulated conductor, and individual layer is around extremely on magnetic core 1.
Have a layer insulating between magnetic core 1 and the coil 2, under the instantaneous overvoltage effect, puncture between the two preventing.
During practical implementation; When the normal current in the circuit is flowed through common mode inductance; Electric current produces reverse magnetic field and cancels out each other in the inductance coil 2 of same-phase coiling, this moment, the normal signal electric current mainly received the influence (with the damping that causes because of leakage inductance on a small quantity) of coil resistance; When flowing through the electric current that common mode disturbances is arranged in the coil 2, understand the induction reactance that in coil 2, produces magnetic field in the same way and increase coil 2, make coil 2 show as high impedance, produce stronger damping, with this attenuation common-mode electric current, reach the purpose of filtering.
In Filter Design, we also can utilize leakage inductance.As in common filter, a common mode inductance only is installed, utilize the leakage inductance of common mode inductance to produce an amount of differential mode inductance, play inhibitory action to differential-mode current.Sometimes, also the very important person improves the differential mode inductance amount, to reach better filter effect for increasing the leakage inductance of common mode choke.
With above-mentioned desirable embodiment according to the utility model is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this utility model technological thought.The technical scope of this utility model is not limited to the content on the specification, must confirm its technical scope according to the claim scope.
Claims (2)
1. common mode inductance; It is characterized in that: comprise a magnetic core (1), two coils (2) and four terminals (3) on this magnetic core (1); Described two coils (2) are measure-alike, the number of turn is identical, coiling is in the opposite direction; Described magnetic core (1) is the ferrite toroidal magnetic core, and described coil (2) is an insulated conductor, and individual layer is around extremely on magnetic core (1).
2. a kind of common mode inductance according to claim 1 is characterized in that: have a layer insulating between described magnetic core (1) and the coil (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203791374U CN202258647U (en) | 2011-09-30 | 2011-09-30 | Common mode choke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203791374U CN202258647U (en) | 2011-09-30 | 2011-09-30 | Common mode choke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202258647U true CN202258647U (en) | 2012-05-30 |
Family
ID=46119853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203791374U Expired - Fee Related CN202258647U (en) | 2011-09-30 | 2011-09-30 | Common mode choke |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202258647U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102956345A (en) * | 2012-11-06 | 2013-03-06 | 苏州康开电气有限公司 | Transformer |
| CN104376969A (en) * | 2014-12-12 | 2015-02-25 | 绵阳市容富电子科技有限公司 | Common-mode inductor |
| CN104376970A (en) * | 2014-12-12 | 2015-02-25 | 绵阳市容富电子科技有限公司 | Common-mode choke |
| CN104377008A (en) * | 2014-12-12 | 2015-02-25 | 绵阳市容富电子科技有限公司 | PFC common mode inductor |
-
2011
- 2011-09-30 CN CN2011203791374U patent/CN202258647U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102956345A (en) * | 2012-11-06 | 2013-03-06 | 苏州康开电气有限公司 | Transformer |
| CN104376969A (en) * | 2014-12-12 | 2015-02-25 | 绵阳市容富电子科技有限公司 | Common-mode inductor |
| CN104376970A (en) * | 2014-12-12 | 2015-02-25 | 绵阳市容富电子科技有限公司 | Common-mode choke |
| CN104377008A (en) * | 2014-12-12 | 2015-02-25 | 绵阳市容富电子科技有限公司 | PFC common mode inductor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120530 Termination date: 20120930 |