CN206210558U - Anti-interference high frequency transformer - Google Patents
Anti-interference high frequency transformer Download PDFInfo
- Publication number
- CN206210558U CN206210558U CN201621284719.3U CN201621284719U CN206210558U CN 206210558 U CN206210558 U CN 206210558U CN 201621284719 U CN201621284719 U CN 201621284719U CN 206210558 U CN206210558 U CN 206210558U
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- CN
- China
- Prior art keywords
- high frequency
- magnetic core
- transformer body
- radome
- transformer
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Abstract
The utility model discloses a kind of anti-interference high frequency transformer, it includes transformer body, the transformer body includes an I-type magnetic core, magnetic core mid-wrap has armature winding and secondary windings, a framework is provided with outside magnetic core, the both ends of magnetic core are supported on the both sides inwall of the framework respectively, and the bottom of the framework is provided with metal stitch；Wherein, the open circuit band that Copper Foil is made is provided between the armature winding and/or the coil of secondary windings；A radome is covered with outside the transformer body, the width between the radome and transformer body with gap, gap is more than 1mm.The utility model carries out electrostatic screen by increasing open circuit band between primary, secondary windings, and radome is covered with outside transformer body is combined shielding, so as to greatly reduce distribution capacity, and then improves the efficiency of Switching Power Supply, reduction ringing noise.
Description
Technical field
The utility model is related to field transformer, more particularly to a kind of anti-interference high frequency transformer.
Background technology
Anti-interference high frequency transformer is that working frequency exceedes intermediate frequency（10kHz）Power transformer, be mainly used in high frequency and open
As high-frequency switch power transformer in powered-down source, also have for inverse as high frequency in high frequency inverter and Inverter Welder
Variable power source transformer.By working frequency just, anti-interference high frequency transformer can be divided into several class：10kHz-50kHz、
50kHz-100kHz, 100kHz~500kHz, 500kHz~1MHz, more than 1MHz.
Anti-interference high frequency transformer is the topmost part of Switching Power Supply.Topological structure in Switching Power Supply has very
It is many, such as semibridge system circuit for power conversion, two switch triodes turn on to produce the high-frequency impulse of 100kHz in turn during work
Ripple, then carries out transformation by anti-interference high frequency transformer, exports alternating current, anti-interference each winding coil of high frequency transformer
Number of turn ratio then determines the number of output voltage.The most obvious in typical semibridge system transforming circuit is three anti-interference height
Frequency power transformer：Main transformer, driving transformer and auxiliary transformer（Standby transformer）, every kind of transformer in national regulation all
There are respective criterion, such as main transformer, as long as the power supply of more than 200W, its core diameter（Highly）Just cannot be less than
35mm.And auxiliary transformer, power be no more than 300W when its core diameter reach 16mm just it is much of that.In Switching Power Supply
During transistor switching, by repeatedly charging and discharging, its energy is all clamped and is disappeared with absorbing circuit the distribution capacity of coil
Consumption, reduces the efficiency of Switching Power Supply.Additionally, the distribution capacity of coil also forms LC vibrations together with the leakage inductance of coil, produce
Ringing noise.
Utility model content
Therefore, for above-mentioned problem, the utility model proposes a kind of new anti-interference high frequency transformer, to existing
Anti-interference high-frequency transformer structure is improved, and distribution capacity is reduced by increasing electrostatic screen measure, and then improve switch
The efficiency of power supply, reduces ringing noise.
In order to solve the above-mentioned technical problem, the technical scheme that the utility model is used is, a kind of anti-interference high frequency transformation
Device, including transformer body, the transformer body include an I-type magnetic core, magnetic core mid-wrap have armature winding and it is secondary around
Group, is provided with a framework outside magnetic core, the both ends of magnetic core are supported on the both sides inwall of the framework respectively, the bottom of the framework
It is provided with metal stitch；Wherein, the open circuit band that Copper Foil is made is provided between the armature winding and/or the coil of secondary windings.
The utility model by set open circuit band with reduce the misfortune between armature winding and secondary windings close, this open circuit band both with
The magnetic core connection of anti-interference high frequency transformer, can be connected with the ground of Switching Power Supply again, can play good electrostatic screen effect.
Preferably, the area of section of the open circuit band is not less than 6cm2, the thickness of band of opening a way is more than 1mm.Open circuit band
The magnetic resistance of ring is linear with its area of section, and magnetic resistance characterizes material to the obstruction characteristic by magnetic flux, and the definition of magnetic resistance is：
R=L/μ A, L is magnetic flux path length（cm）, A areas of section（cm2）, μ is magnetic conductivity, and μ=B/H, H is magnetic field intensity,
B is magnetic flux density.From the foregoing, it will be observed that to high frequency transformer, the permeability of shielding material is higher, thicker, and area of section is bigger, then shield
Cover efficiency higher.
It is further preferred that a radome is covered with outside the transformer body, between the radome and transformer body
With gap, the width in gap is more than 1mm.Meanwhile, non-magnetic rate material is filled with gap.When needing, the magnetic field of shielding is very strong
When, single-layer shield material is only used, it is not not reach shielding requirements, saturation can exactly occur, the utility model proposes one kind combination
The mode of shielding, is internally shielded using open circuit band, and radome is installed additional in the outside of whole transformer body, carries out group
Shielding is closed, can preferably suppress radiation interference.Meanwhile, carry shield by one（Open circuit band）Transformer body be placed on
In another radome, and gap is left between the two, any non-magnetic rate material can be filled in gap and is supported, such as aluminium.
The shield effectiveness for combining shielding is more much higher than single shield, therefore combination shielding can play the shield effectiveness of higher level.
It is further preferred that the outer surface of the magnetic core is provided with one layer of insulating tape.
It is further preferred that being arranged with insulating cell between the armature winding and secondary windings, insulating cell can basis
It is actually needed to set its number of plies, general 3~5 layers.Can be reduced between armature winding and secondary windings by insulating cell
The capacitance of distribution capacity, is conducive to the common mode for reducing switched power output to harass；Simultaneously also increase armature winding and time
Dielectric strength between level winding, meets the pressure-resistant requirement of insulation.
According to the general principle of electromagnetic shielding, low frequency magnetic field is low due to its frequency, Kelvin effect very little, and absorption loss is very
It is small, and because its wave impedance is very low, reflection loss also very little, therefore it is simple by absorbing and reflection is difficult to obtain the shielding of needs
Efficiency.The utility model carries out electrostatic screen by increasing open circuit band between primary, secondary windings, and in transformer sheet
It is external to be covered with radome and be combined shielding, so as to greatly reduce distribution capacity, and then the efficiency of Switching Power Supply is improved, reduction
Ringing noise.The utility model simple structure is easily achieved, with good practicality.
Brief description of the drawings
Fig. 1 is the overall structure diagram of anti-interference high frequency transformer of the present utility model；
Fig. 2 is the transformer body schematic diagram of anti-interference high frequency transformer of the present utility model；
Fig. 3 is the coiling schematic diagram of anti-interference high frequency transformer of the present utility model.
Specific embodiment
The utility model is further illustrated in conjunction with the drawings and specific embodiments.
As a specific example, referring to Fig. 1, a kind of anti-interference high frequency transformer of the present utility model, including transformation
Device body 100 and cover in the radome 200 outside transformer body 100.In the present embodiment, set on the inwall of the radome 200
Have raised 201, transformer body 100 is provided with corresponding draw-in groove（Do not shown on figure）, draw-in groove is placed in by raised 201
It is interior and cover at outside transformer body 100 radome 200, and between the side wall and transformer body 100 of the radome 200
With gap, the width d in gap is more than 1mm.Meanwhile, non-magnetic rate material can be filled with gap, can also be not filled with certainly.
Referring to Fig. 2 and Fig. 3, the transformer body 100 includes an I-type magnetic core 101, is winding section in the middle of magnetic core 101
1011, armature winding 102 and secondary windings 103 are wound with winding section 1011, a framework 104, magnetic core are provided with outside magnetic core 101
101 both ends are supported on the both sides inwall of the framework 104 respectively, and the bottom of the framework 104 is provided with metal stitch 105；
Wherein, in the present embodiment, the open circuit band 106 that two Copper Foils are made, secondary windings are provided between the coil of armature winding 102
The open circuit band 106 that two Copper Foils are made also is provided between 103 coil.The outer surface of magnetic core 101 is additionally provided with one layer of insulating cement
Band（Do not shown on figure）.The utility model by open circuit band 106 is set with reduce armature winding 102 and secondary windings 103 it
Between misfortune close, this open circuit band 106 be both connected with the magnetic core 101 of anti-interference high frequency transformer, again can be with the ground of Switching Power Supply
Connection, can play good electrostatic screen effect.
In addition, being arranged with insulating cell 107 between armature winding 102 and secondary windings 103, insulating cell 107 can basis
It is actually needed to set its number of plies, general 3~5 layers.By insulating cell 107 can reduce armature winding 102 and it is secondary around
The capacitance of distribution capacity between group 103, is conducive to the common mode for reducing switched power output to harass；Also increase primary simultaneously
Dielectric strength between winding 102 and secondary windings 103, meets the pressure-resistant requirement of insulation.
Wherein, the area of section of open circuit band is not less than 6cm2, the thickness of band of opening a way is more than 1mm.The magnetic of open circuit band
Resistance is linear with its area of section, and magnetic resistance characterizes material to the obstruction characteristic by magnetic flux, and the definition of magnetic resistance is：R = L
/ μ A, L are magnetic flux path length（cm）, A areas of section（cm2）, μ is magnetic conductivity, and μ=B/H, H are magnetic field intensity, and B is magnetic
Flux density.From the foregoing, it will be observed that to high frequency transformer, the permeability of shielding material is higher, thicker, and area of section is bigger, then shielding is imitated
Can be higher.
The utility model is covered with a radome outside transformer body, when the magnetic field for needing to shield is very strong, only with list
Layer shielding material, is not not reach shielding requirements, and saturation can exactly occur, the utility model proposes a kind of side for combining shielding
Formula, is internally shielded using open circuit band, and radome is installed additional in the outside of whole transformer body, is combined shielding,
Radiation interference can preferably be suppressed.Meanwhile, a transformer body with shield is placed in another radome, and
Gap is left between the two, any non-magnetic rate material can be filled in gap and is supported, such as aluminium.Combine the shield effectiveness of shielding
It is more much higher than single shield, therefore combination shielding can play the shield effectiveness of higher level.
Although specifically showing and describing the utility model with reference to preferred embodiment, those skilled in the art should
This is understood, not departing from the spirit and scope of the present utility model that appended claims are limited, in form and details
On the utility model can be made a variety of changes, be protection domain of the present utility model.
Claims (6)
1. a kind of anti-interference high frequency transformer, it is characterised in that：Including transformer body, the transformer body includes that one is I-shaped
Magnetic core, magnetic core mid-wrap has armature winding and secondary windings, and a framework is provided with outside magnetic core, and the both ends of magnetic core are supported respectively
On the both sides inwall of the framework, the bottom of the framework is provided with metal stitch；Wherein, the armature winding and/or secondary around
The open circuit band that Copper Foil is made is provided between the coil of group, the area of section of the open circuit band is not less than 6cm2。
2. anti-interference high frequency transformer according to claim 1, it is characterised in that：The thickness of the open circuit band is more than
1mm。
3. anti-interference high frequency transformer according to claim 1 and 2, it is characterised in that：The transformer body outer cover sets
There is a radome, there is gap between the radome and transformer body.
4. anti-interference high frequency transformer according to claim 3, it is characterised in that：The radome and transformer body it
Between gap width be more than 1mm.
5. anti-interference high frequency transformer according to claim 1, it is characterised in that：The outer surface of the magnetic core is provided with one layer
Insulating tape.
6. anti-interference high frequency transformer according to claim 1, it is characterised in that：The armature winding and secondary windings it
Between be arranged with insulating cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621284719.3U CN206210558U (en) | 2016-11-28 | 2016-11-28 | Anti-interference high frequency transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621284719.3U CN206210558U (en) | 2016-11-28 | 2016-11-28 | Anti-interference high frequency transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206210558U true CN206210558U (en) | 2017-05-31 |
Family
ID=58747567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621284719.3U Expired - Fee Related CN206210558U (en) | 2016-11-28 | 2016-11-28 | Anti-interference high frequency transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206210558U (en) |
-
2016
- 2016-11-28 CN CN201621284719.3U patent/CN206210558U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518000 6 village two, new two community, Xinqiao street, Shenzhen, Guangdong, Baoan District Patentee after: SHENZHEN BAOHUI TECHNOLOGY Co.,Ltd. Address before: 518000 third new two Zhuang village two road 1, Baoan District Sha Jing Street, Shenzhen, Guangdong Patentee before: SHENZHEN BAOHUI HARDWARE ELECTRONICS CO.,LTD. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170531 Termination date: 20211128 |