CN209708809U - Reduce the transformer of electromagnetic interference - Google Patents
Reduce the transformer of electromagnetic interference Download PDFInfo
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- CN209708809U CN209708809U CN201920369679.XU CN201920369679U CN209708809U CN 209708809 U CN209708809 U CN 209708809U CN 201920369679 U CN201920369679 U CN 201920369679U CN 209708809 U CN209708809 U CN 209708809U
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Abstract
The utility model discloses and is provided with winding region on a kind of transformer for reducing electromagnetic interference, including skeleton, primary winding element, shielding winding element, secondary windings, accessory power supply winding and skeleton；Primary winding element includes the first armature winding and the second armature winding, and the first armature winding is wound on the winding region of skeleton；Shield winding includes the first shield winding and secondary shielding winding, and the first shield winding is wound in outside the first armature winding；In outside the first shield winding, secondary shielding winding is wound in outside secondary windings secondary winding wound, and the second armature winding antiphase is inverse to be around in outside secondary shielding winding；Accessory power supply winding is wound in outside the second armature winding.The utility model is a kind of transformer for reducing electromagnetic interference, is reduced between distribution capacity armature winding, and then reduces the coupled capacitor of primary and secondary interlayer, then the port equivalent capacity of winding also becomes smaller therewith, to achieve the purpose that reduce electromagnetic interference.
Description
Technical field
The utility model relates to field transformers, more particularly to a kind of transformer for reducing electromagnetic interference.
Background technique
In the epoch that now current electronic product is prevailing, almost people have contact to obtain all the time, however modern electricity
Sub- product function is stronger and stronger, and electronic circuit also becomes increasingly complex, and electromagnetic interference (EMI) and emc issue become
Main problem.In order to reduce these electronic products in the operating condition to extraneous bring interfere and by external environment interference,
Each countries and regions, which have, formulates corresponding standard to judge the qualified or not of electronic product.It is dry in order to reduce these
It disturbs, engineers both know about the method for doing some anti-electromagnetic interference (EMI)s, such as: filter circuit level-one, two-stage even three-level
Filtering, adjustment PCB copper foil cabling, increase some absorbing circuits, add some magnetic beads etc. in the pin of transistor.
It is well known, however, that the raising of cost, the reduction of working efficiency and one more must can be brought by increasing component
The more a risks of component.It is known that generating electromagnetic interference (EMI) needs to be provided simultaneously with following three conditions, i.e. electromagnetism is dry
Disturb (EMI) three elements: interference source, interferencing propagation approach (or transmission channel) and sensitive equipment.So how not influence to imitate
It is rate, simple under the premise of increase cost and become crucial technical problem effectively reducing electromagnetic interference (EMI).
Utility model content
The purpose of the utility model is to overcome shortcoming in the prior art, provide that a kind of structure is simple, efficiency is higher
And reduce electromagnetic interference transformer.
The purpose of this utility model is achieved through the following technical solutions:
A kind of transformer reducing electromagnetic interference, comprising:
Skeleton is provided with winding region on the skeleton；
Primary winding element, it is described primary winding element include the first armature winding and the second armature winding, described first
Armature winding is wound on the winding region of the skeleton；
Shield winding element, the shielding winding element include the first shield winding and secondary shielding winding, described first
Shield winding is wound in outside first armature winding；
Secondary windings, in outside first shield winding, the secondary shielding winding is wound in the secondary winding wound
Outside the secondary windings, the second armature winding antiphase is inverse to be around in outside the secondary shielding winding；And
Accessory power supply winding, the accessory power supply winding are wound in outside second armature winding.
In one of the embodiments, the coiled wire-wound coil number of first shield winding and the secondary shielding winding around
Line coil number ratio is 1:1.
The coiling of the coiling line footpath of first shield winding and the secondary shielding winding in one of the embodiments,
Line footpath is equal.
Second armature winding is opposite with the winding direction of first armature winding in one of the embodiments,.
The winding turns of second armature winding are 28TS~32TS in one of the embodiments,.
The shielding winding element further includes the first insulating tape in one of the embodiments, the first insulating tape packet
It is overlying on outside first shield winding.
The shielding winding element further includes the second insulating tape in one of the embodiments, the second insulating tape packet
It is overlying on outside the secondary windings.
The thickness of first insulating tape is identical with the thickness of second insulating tape in one of the embodiments,.
The coiling of second armature winding is copper wire in one of the embodiments,.
Leading groove and line outlet groove are offered on the skeleton in one of the embodiments, second armature winding
Starting point is in the leading groove, and the take-up end of second armature winding is in the line outlet groove.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The utility model is a kind of transformer for reducing electromagnetic interference, by setting antiphase it is inverse around second it is primary around
Group, also, the take-up end of the second armature winding is adjusted, to reduce between distribution capacity armature winding, then by the beginning of first
Shield winding is added between grade winding, the second armature winding and secondary windings, to reduce the coupled capacitor of primary and secondary interlayer,
Allow the pressure difference of the adjacent turn-to-turn of coil upper and lower level to become smaller against winding using transformer antiphase in summary, this just allow distribution capacity and
Coupled capacitor becomes smaller, then the port equivalent capacity of winding also becomes smaller therewith, to achieve the purpose that reduce electromagnetic interference；And
And the structure of the transformer is simple, coiling is convenient, for existing transformer, not only will not influence the effect of transformer
Rate and cost can also improve the anti-interference ability to electromagnetism.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram of the transformer of the reduction electromagnetic interference of one embodiment of the utility model；
Fig. 2 is the schematic diagram of internal structure of the transformer shown in FIG. 1 for reducing electromagnetic interference；
Fig. 3 is the structural schematic diagram of another embodiment of the transformer shown in FIG. 1 for reducing electromagnetic interference；
Fig. 4 is the structure principle chart of the transformer shown in FIG. 1 for reducing electromagnetic interference.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The better embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making practical new to this
The disclosure of type understands more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein packet
Include any and all combinations of one or more related listed items.
The three elements of electromagnetic interference (EMI): interference source, interferencing propagation approach (or transmission channel) and sensitive equipment.This
Scheme is exactly to start with certainly solving from the source of electromagnetic interference (EMI).In the design of transformer of inverse-excitation type, we would generally use three
Primary in Mingzhi's winding presss from both sides secondary winding to design, and this winding can reduce the leakage inductance of transformer, reduces power switch
The voltage stress of pipe improves product efficiency thus to reduce absorbing circuit indirectly.But it will increase just using sandwich winding
Coupled capacitor between secondary, in the course of work of Switching Power Supply, the charge and discharge repeatedly of the distribution capacity of winding not only imitates power supply
Rate reduce, it also with the distributed inductance of winding constitute LC oscillator can generate ringing noise, these just will generate electromagnetic interference from
And interference is brought to the external world.Inverse-excitation type list out-put supply design of transformer (sandwich winding), transformer be divided into 4 around
Group, armature winding N1, N3, secondary windings N2, accessory power supply winding N4.Sandwich winding leads to the distribution capacity of transformer
It is increased with the coupled capacitor of primary and secondary, electromagnetic interference (EMI) is caused to increase.
Please refer to Fig. 1 and Fig. 2, a kind of transformer reducing electromagnetic interference, comprising: skeleton 100, primary winding element 200,
Shield winding element 300, secondary windings 400 and accessory power supply winding 500, it should be noted that the skeleton 100 is for winding
Each coil；The primary winding element 200 is used to receive the voltage signal of power supply output, and is provided according to the voltage signal
Input voltage signal gives the secondary windings；The shielding winding element 300 is grounded, and the shielded layer as transformer, is used
In the parasitic capacitance of adjustment transformer, and EMI is inhibited to interfere；The secondary windings 400 is connected with load, for according to input electricity
Signal is pressed to export supply voltage, powering load；The accessory power supply winding 500 is used to convert boost voltage for supply voltage
Signal.
It should be noted that being provided with winding region 110 on the skeleton 100；The winding region 110 is a U-shaped coiling
Structure facilitates the coiling realized to each coil, improves the stability of transformer.
Referring to Fig. 2, the primary winding element 200 includes the first armature winding 210 and the second armature winding 220, institute
The first armature winding 210 is stated to be wound on the winding region 110 of the skeleton 100.It should be noted that first armature winding
210 be the first primary coil, for receiving the voltage signal of power input；Second armature winding 220 is the second primary line
Circle, for antiphase against skeleton is around in, i.e., when the direction of the first armature winding 210 being wound on skeleton is clockwise
It waits, then it is counterclockwise, second armature winding 220 and described first that the second armature winding 220, which is wound on the direction on skeleton,
Being wrapped in for armature winding 210 is contrary；Also, adjust the second armature winding plays take-up end, to reduce to armature winding
Between distribution capacity, then by adding shield winding between the first armature winding, the second armature winding and secondary windings, to reduce
The coupled capacitor of primary and secondary interlayer allows the adjacent turn-to-turn of coil upper and lower level against winding using transformer antiphase in summary
Pressure difference becomes smaller, this just allows distribution capacity and coupled capacitor to become smaller, then the port equivalent capacity of winding also becomes smaller therewith, to reach
To the purpose for reducing electromagnetic interference
Referring to Fig. 2, the shielding winding element 300 includes the first shield winding 310 and secondary shielding winding 320, institute
The first shield winding 310 is stated to be wound in outside first armature winding 210.It should be noted that first shield winding 310
For the common mode interference signal of primary side to be returned to the earth by shielded layer；The secondary shielding winding 320 is used for primary side
Common mode interference signal is by shielded layer back to greatly.
It should also be noted that, referring to Fig. 3, include 6 windings in the transformer of the present embodiment, first it is primary around
Organize N1, the second armature winding N3, secondary windings N2, accessory power supply winding N4, the first shield winding NC1 and secondary shielding winding
NC2。
Referring to Fig. 2, the secondary windings 400 is wound in outside first shield winding 310, the secondary shielding winding
320 are wound in outside the secondary windings 400, and 220 antiphase of the second armature winding is inverse to be around in the secondary shielding winding 320
Outside；The accessory power supply winding 500 is wound in outside second armature winding 220.It should be noted that in this way, passing through setting
Antiphase it is inverse around the second armature winding 220 so that transformer antiphase allows the pressure difference of the adjacent turn-to-turn of coil upper and lower level against winding
Become smaller, this just allows distribution capacity and coupled capacitor to become smaller, then the port equivalent capacity of winding also becomes smaller therewith, subtracts to reach
The purpose of small electromagnetic interference (EMI).Also, transformer antiphase is against winding the case where reaching anti-electromagnetic interference (EMI) standard
Under, product cost can also be effectively reduced and improve product efficiency.
It should be noted that the coiled wire-wound coil number of first shield winding 310 and the secondary shielding winding 320
Coiled wire-wound coil number ratio is 1:1.In the present embodiment, the coiled wire-wound coil number of first shield winding 310 is 1.1 circle (lead copper
Foil), similarly, the coiled wire-wound coil number of the secondary shielding winding 320 is also 1.1 circles (lead copper foil), so, it is ensured that transformation
The shield effectiveness of device, improves the stability of transformer, and reduces electromagnetic interference brought by transformer.
It should be noted that the coiling line footpath of first shield winding 310 and the secondary shielding winding 320 around
Line line footpath is equal.In the present embodiment, the size of the coiling line footpath of first shield winding 310 is 0.025mm, that is,
The diameter of the coiling of first armature winding 210 is 0.025mm.So, it is ensured that the rational design of transformer improves and becomes
The stability of depressor.Further, the coiling of second armature winding is copper wire.
It should be noted that second armature winding 220 is opposite with the winding direction of first armature winding 210.
In the present embodiment, first armature winding, accessory power supply winding and the first shield winding and secondary shielding winding are all suitable
The winding method of hour hands is wrapped on skeleton 100, and the second armature winding is to be wound on skeleton in a reverse direction only, i.e.,
It is wound on skeleton in mode counterclockwise.So we just need the phase by the second armature winding to exchange, that is,
The take-up that rises of second armature winding is exchanged, is just able to satisfy the reasonability of design in this way；To i.e. so that coil upper and lower level is adjacent
The pressure difference of turn-to-turn becomes smaller, and but also distribution capacity and coupled capacitor become smaller, so that the port equivalent capacity of winding
Become smaller therewith, not only can achieve the purpose for reducing electromagnetic interference (EMI) in this way, but also meet the holding water property of design.
It should be noted that the winding turns of second armature winding are 28TS~32TS.In the present embodiment, preferably
, the winding turns of second armature winding are 30TS.Also, the starting point of second armature winding is the PIN3 of skeleton
Foot, and take-up end is the PIN2 foot of skeleton, and the starting point of first armature winding is the PIN1 foot of skeleton, and take-up
End be skeleton PIN2 foot, thus constitute and be winding into opposite phase with the first primary, thus just solve counterclockwise around
The problem of opposite in phase caused by system.
It should be noted that referring to Fig. 3, the shielding winding element 300 further includes the first insulating tape 330, described
One insulating tape 330 is coated on outside first shield winding 210.The shielding winding element 300 further includes the second insulating tape
340, second insulating tape 340 is coated on outside the secondary windings 400.It should be noted first insulating tape 330
Thickness it is identical with the thickness of second insulating tape 340.It, can be closely by the by the way that the first insulating tape 330 is arranged
One shield winding 210 is wrapped on the first armature winding, and the second insulating tape 340 can be closely by secondary windings 400
It is wrapped on the first shield winding 210.
It should be noted that leading groove and line outlet groove are offered on the skeleton, the starting point of second armature winding
In the leading groove, the take-up end of second armature winding is in the line outlet groove.In the present embodiment, embedding
It is placed in the starting point of the second armature winding of leading groove, i.e. the starting point of the second armature winding passes through leading groove and the skeleton
The electrical connection of PIN3 foot, embedded at the take-up end of the second armature winding of line outlet groove, i.e. the take-up end of the second armature winding is by going out
Wire casing is electrically connected with the PIN2 foot of the skeleton.In this way, the antiphase that the second armature winding may be implemented it is inverse around.
It is appreciated that the structural compactness in order to guarantee transformer, to improve input voltage signal and the output of transformer
The reliability of voltage signal, while in order to improve the structural stability of transformer, in one embodiment, referring to Fig. 1,
The transformer further includes being dielectrically separated from component, and the component that is dielectrically separated from includes the first insulating layer, second insulating layer and third
Insulating layer, first insulating layer are embedded between first armature winding and first shield winding, and described first
Insulating layer is closely wound on first armature winding, and the second insulating layer is embedded at the secondary shielding winding and described
Between second armature winding, and the second insulating layer is closely wound on the secondary shielding winding, the third insulating layer
Between second armature winding and the accessory power supply winding, and the third insulating layer is closely wound in described
On two armature windings.In this way, by the first insulating layer of setting, second insulating layer and third insulating layer, when each insulating layer is wrapped in
When on each winding, the layer insulation between each winding can be reinforced, and make the more compact structure of transformer, mentioned
The high transformer class of insulation, while improving the structural stability of transformer.
It should also be noted that, referring to Fig. 4, the transformer in one embodiment of the utility model winding mode into
Row illustrates:
First armature winding N1 initial line of transformer is in the PIN1 foot of transformer, and take-up is in the PIN2 foot of transformer, transformation
Second armature winding N3 initial line of device is in the PIN3 foot of transformer, and take-up is in the PIN2 foot of transformer, and the second armature winding
N3 carries out wrapped anti-clockwise, and the first shield winding NC1 initial line of transformer is in the PIN6 foot of transformer, and take-up end is hanging, transformation
For the same initial line of secondary shielding winding NC2 of device in the PIN6 foot of transformer, take-up end is hanging, the secondary windings N2 initial line of transformer
In the PIN8 foot of transformer, take-up is in the PIN11 foot of transformer, and the accessory power supply winding N4 initial line of transformer is in transformer
PIN5 foot, take-up is in the PIN6 foot of transformer.
It is possible thereby to learn, the take-up end of the first armature winding N1 and the second armature winding N3 are the PIN2 of transformer
Foot, while the second armature winding N3 carries out wrapped anti-clockwise, can reduce the distribution capacity between armature winding, and then reach reduction
The purpose of electromagnetic interference (EMI).
It is mentioned in order to facilitate efficiency when carrying out the winding of coil, improving coiling in order to improve the structural compactness after coiling
The structural stability of high transformer, and in order to reduce the distribution capacity between armature winding, and then reach and reduce electromagnetic interference
Purpose.For example, please referring to Fig. 2 and Fig. 3 in an embodiment, first armature winding is closely wound including one in the bone
Primary thick line on frame, the primary thick line wound clockwise is in formation multi-turn primary thick line circle, two adjacent rings on the skeleton
The lateral wall of the primary thick line circle fits closely together；Second armature winding is closely wound including one in described second
Primary filament on shield winding, the primary filament wrapped anti-clockwise are primary thin in forming multi-turn on the secondary shielding winding
Coil is provided with interval between primary filament circle described in two adjacent rings, and the line footpath of the primary thick line is greater than the primary filament
Line footpath.
It should be noted that each primary thick line circle forms a line and is wound on the skeleton, it is not in overlapping
The case where coil shifts, efficiency when so as to facilitate the winding for carrying out coil, raising coiling；After coiling can also being improved
Structural compactness improves the structural stability of transformer.Also, pass through the lateral wall of primary thick line circle described in setting two adjacent rings
It fits closely together, can also can have the active force mutually supported between coil two-by-two, after coiling not only can be improved
Structural compactness, and then the structural stability of transformer is improved, also further improve winding efficiency when coiling.
It should also be noted that, by the primary thick line of setting wound clockwise and the primary filament of wrapped anti-clockwise,
And the line footpath of primary thick line is greater than the line footpath of primary filament, so that having with the first armature winding and the second armature winding opposite
Phase, reduce the distribution capacity between armature winding, so that the pressure difference of the adjacent turn-to-turn of coil upper and lower level becomes smaller, but also distribution electricity
Hold and coupled capacitor becomes smaller, so that the port equivalent capacity of winding also becomes smaller therewith, it is dry so as to reach reduction electromagnetism
Disturb the purpose of (EMI).
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The utility model is a kind of transformer for reducing electromagnetic interference, by setting antiphase it is inverse around second it is primary around
Group, also, the take-up end of the second armature winding is adjusted, to reduce between distribution capacity armature winding, then by the beginning of first
Shield winding is added between grade winding, the second armature winding and secondary windings, to reduce the coupled capacitor of primary and secondary interlayer,
Allow the pressure difference of the adjacent turn-to-turn of coil upper and lower level to become smaller against winding using transformer antiphase in summary, this just allow distribution capacity and
Coupled capacitor becomes smaller, then the port equivalent capacity of winding also becomes smaller therewith, to achieve the purpose that reduce electromagnetic interference；And
And the structure of the transformer is simple, coiling is convenient, for existing transformer, not only will not influence the effect of transformer
Rate and cost can also improve the anti-interference ability to electromagnetism.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed
Carefully, but it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the general of this field
For logical technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these are all
Belong to the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of transformer for reducing electromagnetic interference characterized by comprising
Skeleton is provided with winding region on the skeleton；
Primary winding element, the primary winding element includes the first armature winding and the second armature winding, and described first is primary
Winding is wound on the winding region of the skeleton；
Winding element is shielded, the shielding winding element includes the first shield winding and secondary shielding winding, first shielding
Winding is wound in outside first armature winding；
Secondary windings, in outside first shield winding, the secondary shielding winding is wound in described the secondary winding wound
Outside secondary windings, the second armature winding antiphase is inverse to be around in outside the secondary shielding winding；And
Accessory power supply winding, the accessory power supply winding are wound in outside second armature winding.
2. it is according to claim 1 reduce electromagnetic interference transformer, which is characterized in that first shield winding around
The coiled wire-wound coil number ratio of line coil number and the secondary shielding winding is 1:1.
3. it is according to claim 1 reduce electromagnetic interference transformer, which is characterized in that first shield winding around
Line line footpath is equal with the coiling line footpath of the secondary shielding winding.
4. the transformer according to claim 1 for reducing electromagnetic interference, which is characterized in that second armature winding and institute
The winding direction for stating the first armature winding is opposite.
5. it is according to claim 1 reduce electromagnetic interference transformer, which is characterized in that second armature winding around
Coil number is 28TS~32TS.
6. the transformer according to claim 1 for reducing electromagnetic interference, which is characterized in that the shielding winding element also wraps
The first insulating tape is included, first insulating tape is coated on outside first shield winding.
7. the transformer according to claim 6 for reducing electromagnetic interference, which is characterized in that the shielding winding element also wraps
The second insulating tape is included, second insulating tape is coated on outside the secondary windings.
8. the transformer according to claim 7 for reducing electromagnetic interference, which is characterized in that the thickness of first insulating tape
It is identical with the thickness of second insulating tape.
9. it is according to claim 1 reduce electromagnetic interference transformer, which is characterized in that second armature winding around
Line is copper wire.
10. it is according to claim 1 reduce electromagnetic interference transformer, which is characterized in that offered on the skeleton into
Wire casing and line outlet groove, the starting point of second armature winding is in the leading groove, the receipts of second armature winding
Line end is in the line outlet groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920369679.XU CN209708809U (en) | 2019-03-21 | 2019-03-21 | Reduce the transformer of electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920369679.XU CN209708809U (en) | 2019-03-21 | 2019-03-21 | Reduce the transformer of electromagnetic interference |
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| Publication Number | Publication Date |
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| CN209708809U true CN209708809U (en) | 2019-11-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109920633A (en) * | 2019-03-21 | 2019-06-21 | 惠州市纬特科技有限公司 | Reduce the transformer of electromagnetic interference |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109920633A (en) * | 2019-03-21 | 2019-06-21 | 惠州市纬特科技有限公司 | Reduce the transformer of electromagnetic interference |
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