CN203118703U - Common mode choke for improving common-mode radiation interference - Google Patents

Common mode choke for improving common-mode radiation interference Download PDF

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Publication number
CN203118703U
CN203118703U CN 201220666084 CN201220666084U CN203118703U CN 203118703 U CN203118703 U CN 203118703U CN 201220666084 CN201220666084 CN 201220666084 CN 201220666084 U CN201220666084 U CN 201220666084U CN 203118703 U CN203118703 U CN 203118703U
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common mode
coil windings
magnetic core
coil winding
common
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CN 201220666084
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Chinese (zh)
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丁峰峰
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Sichuan Changhong Electric Co Ltd
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Sichuan Changhong Electric Co Ltd
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Abstract

The utility model provides a common mode choke for improving common-mode radiation interference. The common mode choke comprises a magnetic core (1), a first coil winding (2) and a second coil winding (3), wherein the magnetic core (1) is a hollow circular ferrite magnetic core with uniform thickness; the first coil winding (2) and the second coil winding (3) are wound on the circumference of the magnetic core (1) side by side in the same winding way; a first input terminal (4) of the first coil winding (2) and a second input terminal (5) of the second coil winding (3) are positioned at the same side of the magnetic core (1); a first output terminal (7) of the first coil winding (2) and a second output terminal (6) of the second coil winding (3) are positioned at the other side of the magnetic core (1); and the number of turns of the first coil winding (2) and the second coil winding (3) are the same. The common mode choke is used for a power supply wire inlet end of a television and can effectively improve the common-mode radiation interference of a power supply end; and the common mode choke has the advantages of simple structure, easiness in implement, saving cost and the like.

Description

A kind of common mode inductance that improves the common mode radiation interference
Technical field
The utility model relates to television set EMC technical field, especially relates to a kind of common mode inductance that improves the common mode radiation interference that is applied to the TV set power end.
Background technology
In needs such as television set are considered the Electrical Appliances Designing of anti-electromagnetic interference and made, often relate to EMC.So-called EMC, it is the english abbreviation form of Electro Magnetic Compatibility, its Chinese implication is Electro Magnetic Compatibility, refers to that the operation that meets the requirements in its electromagnetic environment of electronic equipment or system does not produce the ability of intolerable electromagnetic interference to any equipment in its environment.EMC comprises the requirement of two aspects: refer to that on the one hand electronic equipment 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 electronic equipment has to a certain degree immunity to interference, i.e. electromagnetic susceptibility to the electromagnetic interference that exists in the environment of place.
In order to guarantee that electric appliance component or electronic installation etc. can have the ability of operate as normal in electromagnetic environment, and the research electromagnetic wave all must be considered the EMC problem to mechanism and precautionary measures that social production activity and health work the mischief.But; in EMC design in the past; particularly in television set EMC such as LCD, PDP design; in order to solve the common mode radiation interference problem that power end especially concentrates on low frequency end better; usually will consider and adopt technical schemes such as increasing magnet ring to go to solve; but above-mentioned technical scheme can increase EMC design cost, use cost undoubtedly, thereby causes the corresponding increase of electronic product complete machine cost, has reduced the competitiveness of product in market.
The utility model content
The purpose of this utility model is: at the problem of prior art existence, a kind of common mode inductance that common mode radiation disturbs that improves is provided, can improve the common mode radiation interference problem of electronic product power ends such as television set effectively, can reduce EMC design cost, use cost effectively again, and implement simple.
The purpose of this utility model is achieved through the following technical solutions: a kind of common mode inductance that improves the common mode radiation interference comprises magnetic core, first coil windings and second coil windings; Wherein, described magnetic core is the annular ferrite core of a hollow, described first coil windings all is wound on the described magnetic core circumference with identical winding mode side by side with second coil windings, first input end of described first coil windings all is positioned at magnetic core the same side with second input terminal of described second coil windings, and first lead-out terminal of described first coil windings and second lead-out terminal of described second coil windings all are positioned at the other side of magnetic core.
Further, described first coil windings all forms with the identical enamel insulation lead coiling of specification with second coil windings.
Further, the coiling number of turn of described first coil windings and second coil windings is identical, and internal diameter size is identical.
Further, described first coil windings and second coil windings are evenly to be wound on the magnetic core circumference, and the turn-to-turn distance between adjacent two circles arranged side by side is all identical.
Compared with prior art, a kind of common mode inductance that improves the common mode radiation interference of the utility model only adopts a FERRITE CORE, and two coil windings all are wound on the described magnetic core circumference side by side with identical winding mode, simple in structure, can reach effective common mode radiation interference problem of improving power end, also can reduce the EMC design and manufacture cost effectively, thereby reduce the production cost of complete machine.
Description of drawings
Fig. 1 improves the structure principle chart of the common mode inductance of common mode radiation interference for the utility model is a kind of.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
As shown in Figure 1, a kind of common mode inductance that improves the common mode radiation interference comprises magnetic core 1, first coil windings 2 and second coil windings 3.Wherein, described magnetic core 1 is a uniform endless belt-shaped FERRITE CORE of thickness, and described magnetic core 1 is the nickel-zinc ferrite toroidal core.Because nickel-zinc ferrite has high frequency, wideband, high impedance, low-loss characteristics, therefore, utilize the common mode inductance of ferrite core of nickel-zinc to have certain anti-interference capability, and energy consumption is lower.This common mode inductance is installed in power supply and exchanges the end of incoming cables, especially be installed in the power inleting terminal in the television product, not only can improve the common mode radiation interference problem of TV set power end effectively, and implement simpler, economical, can reduce the manufacturing cost of television set machine product effectively, promote the market competitiveness of television set.
A kind of common mode inductance that improves the common mode radiation interference of the utility model, described first coil windings 2 all is wound on described magnetic core 1 circumference with identical winding mode side by side with second coil windings 3, first input end 4 of described first coil windings 2 all is positioned at magnetic core 1 the same side with second input terminal 5 of described second coil windings 3, and first lead-out terminal 7 of described first coil windings 2 all is positioned at magnetic core 1 an other side with second lead-out terminal 6 of described second coil windings 3.Wherein, described first coil windings 2 all forms with the identical enamel insulation lead coiling of specification with second coil windings 3, and the coiling number of turn is identical, internal diameter size is also identical, for guaranteeing jamproof effect, described first coil windings 2 and second coil windings 3 evenly are wound on magnetic core 1 circumference, turn-to-turn distance B between adjacent two circles arranged side by side is all identical, as specific embodiment, the turn-to-turn distance B value between described first coil windings 2 two circles arranged side by side adjacent with second coil windings 3 is 1-2mm.
Adopt the common mode inductance of this kind structure, its first coil windings 2 and second coil windings 3 include four terminals altogether, wherein, first input end 4, second input terminal 5 are the input terminal of common mode inductance, near the AC power end of incoming cables, first lead-out terminal 7, second lead-out terminal 6 are the lead-out terminal of common mode inductance.When this common mode inductance is installed in the AC power end of incoming cables, for example be used for the TV set power end of incoming cables, after the energising, from current direction, electric current flows into from first input end 4 of first coil windings 2, through after whole first coil windings 2, flow out from first lead-out terminal 7 of first coil windings 2, again through with load that this common mode inductance is connected after, electric current flows into from second lead-out terminal 6 of second coil windings 3 of this common mode inductance again, through after whole second coil windings 3, flow out from second input terminal 5 of second coil windings 3, therefore, for running current, the sense of current in the two circle coils side by side of first coil windings 2 of this common mode inductance and second coil windings 3 is opposite, cancel out each other in the magnetic field that rightabout parallel alternating current produces, magnetic core is difficult for saturated, for common mode interference signal, this common mode inductance is because the high-impedance behavior of its wider frequency range can be improved the common mode radiation interference problem of TV set power end effectively, and implement simple, economy has reduced EMC design cost and application cost effectively.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; should be pointed out that all any modifications of within spirit of the present utility model and principle, doing, be equal to replacement and improvement etc., all should be included within the protection range of the present utility model.

Claims (7)

1. one kind is improved the common mode inductance that common mode radiation disturbs, comprise magnetic core (1), first coil windings (2) and second coil windings (3), it is characterized in that: described magnetic core (1) is the annular ferrite core of a hollow, described first coil windings (2) all is wound on described magnetic core (1) circumference with identical winding mode side by side with second coil windings (3), first input end (4) of described first coil windings (2) all is positioned at magnetic core (1) the same side with second input terminal (5) of described second coil windings (3), and first lead-out terminal (7) of described first coil windings (2) all is positioned at the other side of magnetic core (1) with second lead-out terminal (6) of described second coil windings (3).
2. a kind of common mode inductance that common mode radiation disturbs that improves according to claim 1, it is characterized in that: described first coil windings (2) all forms with the identical enamel insulation lead coiling of specification with second coil windings (3).
3. according to claim 1 or 2 described a kind of common mode inductances that common mode radiation disturbs that improve, it is characterized in that: described first coil windings (2) is identical with the coiling number of turn of second coil windings (3), and internal diameter size is identical.
4. according to claim 1 or 2 described a kind of common mode inductances that common mode radiation disturbs that improve, it is characterized in that: described first coil windings (2) and second coil windings (3) evenly are wound on magnetic core (1) circumference, and the turn-to-turn distance between adjacent two circles arranged side by side is all identical.
5. a kind of common mode inductance that common mode radiation disturbs that improves according to claim 4 is characterized in that: the turn-to-turn distance between described first coil windings (2) two circles arranged side by side adjacent with second coil windings (3) is 1-2mm.
6. a kind of common mode inductance that common mode radiation disturbs that improves according to claim 1, it is characterized in that: described magnetic core (1) is a uniform endless belt-shaped FERRITE CORE of thickness.
7. according to claim 1 or 6 described a kind of common mode inductances that common mode radiation disturbs that improve, it is characterized in that: described magnetic core (1) is the nickel-zinc ferrite toroidal core.
CN 201220666084 2012-12-06 2012-12-06 Common mode choke for improving common-mode radiation interference Active CN203118703U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN 201220666084 CN203118703U (en) 2012-12-06 2012-12-06 Common mode choke for improving common-mode radiation interference

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CN203118703U true CN203118703U (en) 2013-08-07

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107025974A (en) * 2017-05-22 2017-08-08 无锡晶磊电子有限公司 A kind of winding method for common-mode inductor
CN110233044A (en) * 2019-07-12 2019-09-13 蚌埠市双环电感股份有限公司 A kind of ring-shaped inductors method for winding and its inductance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107025974A (en) * 2017-05-22 2017-08-08 无锡晶磊电子有限公司 A kind of winding method for common-mode inductor
CN110233044A (en) * 2019-07-12 2019-09-13 蚌埠市双环电感股份有限公司 A kind of ring-shaped inductors method for winding and its inductance

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