CN206210558U - Anti-interference high frequency transformer - Google Patents

Anti-interference high frequency transformer Download PDF

Info

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
Authority
CN
China
Prior art keywords
transformer
interference
magnetic core
radome
windings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201621284719.3U
Other languages
Chinese (zh)
Inventor
易沈辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Bao Hui Polytron Technologies Inc
Original Assignee
Shenzhen City Bao Hui Hardware Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen City Bao Hui Hardware Electronics Co Ltd filed Critical Shenzhen City Bao Hui Hardware Electronics Co Ltd
Priority to CN201621284719.3U priority Critical patent/CN206210558U/en
Application granted granted Critical
Publication of CN206210558U publication Critical patent/CN206210558U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

Anti-interference high frequency transformer
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.
CN201621284719.3U 2016-11-28 2016-11-28 Anti-interference high frequency transformer Active CN206210558U (en)

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 Active CN206210558U (en) 2016-11-28 2016-11-28 Anti-interference high frequency transformer

Country Status (1)

Country Link
CN (1) CN206210558U (en)

Similar Documents

Publication Publication Date Title
Nagatsuka et al. Compact contactless power transfer system for electric vehicles
Fu et al. Investigation on transformer design of high frequency high efficiency dc-dc converters
CN105742047A (en) Control method for inductance parameter of high-frequency transformer body
Guidi et al. Efficiency optimization of high power density dual active bridge dc-dc converter
CN102231318A (en) Method and transformer for reducing common-mode interference in sandwich winding transformer
CN204480870U (en) A kind of transmitting coil structure of high quality factor
CN105099205A (en) Switching power supply, flyback converter and transformer
CN104036921A (en) Magnetically-coupled resonant high-frequency air-core transformer
TW201320122A (en) Reactor and electrical device
Elrajoubi et al. High-frequency transformer review and design for low-power solid-state transformer topology
CN111817303A (en) Circuit and method for improving power quality of power grid
Yeh et al. A study on high frequency transformer design in medium-voltage solid-state transformers
CN104616865A (en) Transformer
CN206210558U (en) Anti-interference high frequency transformer
CN203673947U (en) Transformer
CN202585081U (en) High-power magnetic integrated transformer for electric vehicle charging machine
CN206163275U (en) Transformer
Alabakhshizadeh et al. Air gap fringing flux reduction in a high frequency inductor for a solar inverter
CN203827227U (en) Novel energy-saving high-frequency excitation cabinet
CN204390867U (en) A kind of high frequency transformer
Hsieh et al. An inductive wireless charger for electric vehicle by using LLC resonance with matrix ferrite core group
CN110301019B (en) Transformer and switching power supply
CN103594237B (en) A kind of 18 pulse phase shifting rectifier transformers
Ambatipudi et al. High performance planar power transformer with high power density in MHz frequency region for next generation switch mode power supplies
CN102881412A (en) Energy-generation transformer

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 Bao Hui Polytron Technologies Inc

Address before: 518000 third new two Zhuang village two road 1, Baoan District Sha Jing Street, Shenzhen, Guangdong

Patentee before: Shenzhen City Bao Hui Hardware Electronics Co., Ltd.