CN104064329A - High-frequency pulse transformer with planar magnetic core - Google Patents
High-frequency pulse transformer with planar magnetic core Download PDFInfo
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- CN104064329A CN104064329A CN201310095432.0A CN201310095432A CN104064329A CN 104064329 A CN104064329 A CN 104064329A CN 201310095432 A CN201310095432 A CN 201310095432A CN 104064329 A CN104064329 A CN 104064329A
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Abstract
The invention relates to a high-frequency pulse transformer with a planar magnetic core. A base plate of a planar transformer coil winding is made from a ferrite soft magnetic insulating material. A single-layer planar coil is made on the ferrite insulating base plate by the technologies of ion sputtering, vacuum vapor deposition, screen printing and the like. A planar coil of a secondary winding is embedded between primary winding layers, and reverse current phase is formed between the adjacent primary winding layers. As a result, energy can be transmitted to the secondary winding through the utilization of resultant magnetic flux between the primary windings, and transformer external resultant magnetic flux generating electromagnetic interference is greatly reduced. Therefore, the electromagnetic interference (EMI) is effectively inhibited, the magnetic flux transmitting energy is fully separated from the magnetic flux generating electromagnetic interference, and electromagnetic interference caused by stray radiation is greatly reduced under the condition of effectively improving the transformer transmission efficiency and the power density.
Description
Technical field
The present invention relates to high-frequency pulse transformer technology.Relate in particular to dull and stereotyped magnetic core high-frequency pulse transformer.
Background technology
Continuous progress along with secondary power supply technology, planar high-frequency pulse transformer is subject to the attention in boundary day by day with its good high frequency performance, yet planar high-frequency pulse transformer is also difficult to go beyond the technical bottleneck of proximity effect, and the compactness of volume and the rising of frequency make the impact of proximity effect more serious, the lifting of its performance is restricted; High cost has limited the popularization and application of planar high-frequency pulse transformer simultaneously.
Up to now, flat surface transformer is still continued to use the core structure of traditional transformer---mainly take " E " shape as main; The distribution of winding and direction of current flow are also basic identical with traditional transformer.These designs and structure cannot be broken away from proximity effect, the leakage field that traditional transformer runs into ... Deng technical barrier, so, although planar pulse transformer has solved skin effect, focus preferably ... etc. problem, make the performance of high-frequency pulse transformer obtain obvious lifting, but still have very large skill upgrading space.
Summary of the invention
Dull and stereotyped magnetic core high-frequency pulse transformer involved in the present invention, adopt ferrite soft magnetic insulating material to make the substrate 2-1 of flat surface transformer coil windings, utilize ion sputtering, vacuum evaporation, screen painting ... etc. technique, on ferrite insulated substrate, make single flat planar coil 2-2, the planar coil of secondary winding is embedded into armature winding interlayer, and make adjacent armature winding interlayer electric current anti-phase, just can utilize the interlayer resultant flux 4-5 of armature winding to secondary winding transmitting energy, and the outside resultant flux 4-7 that produces electromagnetic interference is significantly weakened, thereby effectively suppressed electromagnetic interference (EMI), the magnetic flux 4-5 of transmitting energy and the magnetic flux 4-7 that produces electromagnetic interference are peeled away completely, when effectively promoting transformer efficiency of transmission and power density, significantly reduce the electromagnetic interference that stray radiation causes.
According to Ampere's law, the flat surface transformer that can simply judge single layer structure is after anti-phase by the interlayer electric current of armature winding, the interior flux 4-5 of its interlayer strengthens mutually, the outside magnetic flux 4-4 of interlayer cancels out each other, by the resultant flux 4-6 that only has top layer and bottom winding, being mutually to strengthen, can producing the outside magnetic flux 4-7 of winding---this magnetic flux is the root that produces electromagnetic interference; Interlayer by secondary winding design at armature winding, just can make full use of armature winding interlaminar improvement magnetic flux 4-5 transmitting energy, and the outside magnetic flux 4-7 of transmission electromagnetic interference does not participate in Energy Transfer, the magnetic flux 4-5 that has realized transmitting energy peels off completely with the magnetic flux 4-7 that produces electromagnetic interference.
By further analysis, individual layer plane winding is as one group of coil, and their turn-to-turn magnetic flux 4-2 cancels out each other, and outside magnetic flux 4-3 strengthens mutually.Individual layer plane winding is superposeed, and making between adjacent layer electric current anti-phase, the interlayer magnetic flux 4-5 between this two layer planes winding strengthens mutually, and the outside magnetic flux 4-4 of interlayer cancels out each other, the resultant flux of winding outside weakens during than single layer winding to some extent, theoretical foundation of the present invention that Here it is.Secondary winding is embedded between the planar primary winding of two groups of individual layers, just can utilizes the interlayer resultant flux 4-5 of armature winding to secondary winding transmitting energy; Now, the outside resultant flux 4-7 of armature winding has not participated in Energy Transfer, and has significantly been weakened, and can also shield as required and suppress.
According to analysis above, the magnetic flux of transmitting energy is in the interlayer conduction of armature winding, utilize ferrite soft magnetic insulating material to make the base material of flat surface transformer individual layer plane winding, winding is produced on to dull and stereotyped soft magnetic material surface, not only do not affect the normal making of winding, when the magnetic property that utilizes substrate strengthens and to be coupled between winding, can also effectively weaken by controlling the thickness of ferrite base material the impact of proximity effect between winding layers.The flat surface transformer that adopts the technology of the present invention to make can be operated in 100kHz～30MHz frequency range.
Can adopt ion sputtering film coating, vacuum vapor plating, physical vapour deposition (PVD), chemical vapour deposition (CVD) ... etc. kinds of processes, make planar coil on ferroxcube magnetic insulating substrate, these techniques all can strictly be controlled the thickness of plated film; Also can adopt screen printing process, coated technique to make the coil of graphite material.The conductor of coil can have multiple choices as required, for example: gold, silver, copper ... in metal material, also can be the metal oxide nonmetallic materials of the high conductivities such as graphite based material or butter of tin, but film-forming temperature must be lower than the Curie temperature of Ferrite Material.
Via hole between single flat planar coil heap poststack making layer, crosses interlayer hole and makes according to technique needs, can carry out after completing all planar coil is stacking, or carries out in the stacking process of planar coil.The manufacture craft of via hole adopts heavy copper method or completion method conventionally, also can adopt welding, crimping ... etc. method.
According to the needs of electromagnetic shielding, top layer and the bottom at coil assembly are designed with respectively screen, this screen is the conductor that radially leaves insulation gap, this insulation gap can prevent that the flux current of conductively-closed from producing closed circuit, screen is designed with earth terminal, and this earth terminal is ground connection or unsettled as required.
In the stacking process of single flat planar coil; between every layer, implement necessary insulation measures; coil assembly after stacking completing; be encased in the outer box of custom-designed soft magnetic ferrites; this outer box can effectively be protected coil circuit; also be the path of the outside resultant flux of coil, can play the effect that suppresses electromagnetic radiation simultaneously.
The dull and stereotyped magnetic core high-frequency pulse transformer outside completing is reserved with coil electrode, and transformer Inside coil is connected with circuit by electrode.The material of electrode is generally copper, copper is gold-plated, copper is silver-plated ... in metal material.
Accompanying drawing explanation
Fig. 1: conventional planar transformer device structure schematic diagram
1---planar coil;
1-1---armature winding;
1-2---secondary winding;
1-3 electrode;
3-1---magnetic core.
Fig. 2: single layer winding resultant flux schematic diagram
4-1---single conductor magnetic flux;
4-2---resultant flux between conductor turns;
The outside resultant flux of 4-3---wire.
Fig. 3: the structure of the anti-phase winding of interlayer electric current and magnetic flux schematic diagram
4-1---single conductor magnetic flux;
4-2---resultant flux between conductor turns;
The outside resultant flux of 4-4---interlayer;
The inner resultant flux of 4-5---interlayer;
4-6---winding top layer and bottom resultant flux;
4-7---total resultant flux.
Fig. 4: the anti-phase winding magnetic flux of interlayer electric current synthesizes schematic diagram
4-1---single conductor magnetic flux;
4-2---resultant flux between conductor turns;
The outside resultant flux of 4-4---interlayer;
The inner resultant flux of 4-5---interlayer;
4-6---winding top layer and bottom resultant flux.
Fig. 5: flat plate magnet core transformer catotropia structural representation
1---planar coil;
1-3---copper electrode;
2-1---ferroxcube magnetic insulating substrate;
2-2---planar coil;
2-3---interlevel via;
2-4---location hole.
Fig. 6: flat plate magnet core transformer hypertropia structural representation
1---planar coil;
1-3---copper electrode;
2-1---ferroxcube magnetic insulating substrate;
2-2---planar coil;
2-3---interlevel via;
2-4---location hole.
Fig. 7: flat plate magnet core transformer general structure schematic diagram
1---planar coil;
1-3---copper electrode;
2-1---ferroxcube magnetic insulating substrate;
The outer box of 5-1---ferrite soft magnetic insulating material.
Embodiment
embodiment mono-: ion sputtering technique is made dull and stereotyped magnetic core high-frequency pulse transformer.
Adopt ferrite soft magnetic insulating material to make the substrate of flat surface transformer single flat planar coil, on this ferrite substrate, be reserved with interlevel via, electrode pilot hole, location hole ... Deng fabrication hole; Utilize ion sputtering technique on ferrite substrate, to make the conducting film that a layer thickness meets the demands; The techniques such as recycling laser, etching cut into planar spiral winding by conducting film; Adopt heavy process for copper at the certain thickness copper conductive layer of interlevel via surface deposition of ferrite substrate; In the stacking process of coil, the interlevel via that adopts welding procedure that needs are communicated with is electrically connected; Coil stacking followed elementary → secondary → elementary principle, and top layer and the bottom are primary coil.
In the stacking process of single flat planar coil; between every layer, implement necessary insulation measures; coil assembly after stacking completing; be encased in the outer box of custom-designed soft magnetic ferrites; this outer box can effectively be protected coil circuit; also be the path of the outside resultant flux of coil, can play the effect that suppresses electromagnetic radiation simultaneously.
According to the armature winding layer electric current anti-phase principle adjacent with secondary winding layer, be connected the interlayer wiring of armature winding, guarantee that between armature winding interior layer, magnetic flux is mutually to strengthen in secondary winding plane.Now, between the exterior layer of armature winding, magnetic flux is cancelled out each other, and only having the outside magnetic flux of the outside magnetic flux of top layer and the bottom is mutually to strengthen, and this part magnetic flux does not participate in power conversion, only can produce stray radiation, should reduce as far as possible.
2 layers of secondary winding total (the total number of plies-1) ÷, secondary winding can have multiple connected mode, according to the requirement of output voltage and power output, sets the connected mode of secondary winding.
embodiment bis-: screen printing process is made graphite coil flat plate magnet core high-frequency pulse transformer.
Adopt ferrite soft magnetic insulating material to make the substrate of flat surface transformer single flat planar coil, on this ferrite substrate, be reserved with interlevel via, electrode pilot hole, location hole ... Deng fabrication hole; Adopt screen printing process on ferrite substrate, to make the graphite planar spiral winding that a layer thickness meets the demands; Adopt fill process in the interlevel via of ferrite substrate, to fill full graphite conductor; Coil stacking followed elementary → secondary → elementary principle, and top layer and the bottom are primary coil.
In the stacking process of single flat planar coil; between every layer, implement necessary insulation measures; coil assembly after stacking completing; be encased in the outer box of custom-designed soft magnetic ferrites; this outer box can effectively be protected coil circuit; also be the path of the outside resultant flux of coil, can play the effect that suppresses electromagnetic radiation simultaneously.
According to the armature winding layer electric current anti-phase principle adjacent with secondary winding layer, be connected the interlayer wiring of armature winding, guarantee that between armature winding interior layer, magnetic flux is mutually to strengthen in secondary winding plane.Now, between the exterior layer of armature winding, magnetic flux is cancelled out each other, and only having the outside magnetic flux of the outside magnetic flux of top layer and the bottom is mutually to strengthen, and this part magnetic flux does not participate in power conversion, only can produce stray radiation, should reduce as far as possible.
2 layers of secondary winding total (the total number of plies-1) ÷, can have multiple connected mode, according to the requirement of output voltage and power output, set the connected mode of secondary winding.
Claims (8)
1. dull and stereotyped magnetic core high-frequency pulse transformer.It is characterized in that: adopt ferrite soft magnetic insulating material to make the substrate of flat surface transformer coil windings, on ferrite substrate, be reserved with fabrication hole, utilize ion sputtering, vacuum evaporation, screen painting ... etc. technique, on ferrite insulated substrate, make the individual layer plane winding of low resistivity conductor, the plane winding of secondary winding is embedded into armature winding interlayer, and make adjacent armature winding interlayer electric current anti-phase, just can utilize the interlayer resultant flux of armature winding to secondary winding transmitting energy, and the outside resultant flux of the transformer that produces electromagnetic interference is significantly weakened, thereby effectively suppressed electromagnetic interference (EMI), the magnetic flux of transmitting energy and the magnetic flux that produces electromagnetic interference are peeled away completely, when effectively promoting transformer efficiency of transmission and power density, significantly reduce the electromagnetic interference that stray radiation causes.
In the stacking process of single flat planar coil; between every layer, implement necessary insulation measures; coil assembly after stacking completing; be encased in the outer box of custom-designed soft magnetic ferrites; this outer box can effectively be protected coil circuit; also be the path of the outside resultant flux of coil, can play the effect that suppresses electromagnetic radiation simultaneously.
2. according to ferrite soft magnetic insulating material claimed in claim 1.It is characterized in that: there is higher Curie temperature, 180 ℃ of its Curie point >.
3. according to being reserved with fabrication hole on ferrite substrate claimed in claim 1.It is characterized in that: on ferrite substrate, be reserved with interlevel via, electrode pilot hole, location hole ... Deng fabrication hole.
4. according to the individual layer plane winding of making on ferrite insulated substrate claimed in claim 1.It is characterized in that: utilize ion sputtering, vacuum evaporation, screen painting ... etc. technique, on the surface of ferrite insulated substrate, make the individual layer plane winding of low resistivity conductor.
5. according to low resistivity conductor claimed in claim 1.It is characterized in that: low resistivity conductor comprises: gold, silver, copper ... in metal material, can be also the metal oxide nonmetallic materials of the high conductivities such as graphite based material or butter of tin, but film-forming temperature must be lower than the Curie temperature of Ferrite Material.
6. according to the plane winding by secondary winding claimed in claim 1, be embedded into armature winding interlayer.It is characterized in that: coil stacking followed elementary → secondary → elementary principle, and top layer and the bottom are primary coil; Armature winding total (the total number of plies-1) ÷ 2+1 layer, 2 layers of secondary winding total (the total number of plies-1) ÷.In the stacking process of single flat planar coil, between every layer, implement necessary insulation measures.
7. according to claimed in claim 1, make adjacent armature winding interlayer electric current anti-phase, just can utilize the interlayer resultant flux of armature winding to secondary winding transmitting energy.It is characterized in that: armature winding and secondary winding are alternate stacking, so the primary winding current adjacent with each hierarchical level winding is anti-phase, just can meet the anti-phase requirement of adjacent armature winding interlayer electric current.
8. according to the coil assembly after stacking completing claimed in claim 1, be encased in the outer box of custom-designed soft magnetic ferrites.It is characterized in that: according to the specification of product, the outer box of the soft magnetic ferrites of design specialized, this outer box can effectively be protected coil circuit, is also the path of the outside resultant flux of coil simultaneously, can play the effect that suppresses electromagnetic radiation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310095432.0A CN104064329A (en) | 2013-03-22 | 2013-03-22 | High-frequency pulse transformer with planar magnetic core |
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| CN201310095432.0A CN104064329A (en) | 2013-03-22 | 2013-03-22 | High-frequency pulse transformer with planar magnetic core |
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| CN201310095432.0A Pending CN104064329A (en) | 2013-03-22 | 2013-03-22 | High-frequency pulse transformer with planar magnetic core |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525370A (en) * | 2014-12-18 | 2015-04-22 | 佛山市赛科科技股份有限公司 | Deironing device |
| WO2016115952A1 (en) * | 2015-01-19 | 2016-07-28 | 中兴通讯股份有限公司 | Pcb having magnetic core mounting hole, and transformer |
| CN108258912A (en) * | 2015-09-11 | 2018-07-06 | 万国半导体(开曼)股份有限公司 | Pulse transformer |
| CN109559868A (en) * | 2018-11-30 | 2019-04-02 | 北京航天微电科技有限公司 | A kind of high power plate electromagnetic interface filter |
| CN112331461A (en) * | 2020-11-03 | 2021-02-05 | 衡山萌泰电子有限公司 | Resonance transformer |
| US11664157B2 (en) | 2018-11-02 | 2023-05-30 | Delta Electronics (Shanghai) Co., Ltd. | Magnetic element and method for manufacturing same |
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| CN1452774A (en) * | 1998-07-06 | 2003-10-29 | 密德康姆股份有限公司 | Multilayer transformer having electrical connection in magnetic core |
| CN2919484Y (en) * | 2006-06-23 | 2007-07-04 | 杨涤东 | No-noise low-magnetic-leakage power supply transformer |
| JP2011142218A (en) * | 2010-01-07 | 2011-07-21 | Toshiba Industrial Products Manufacturing Corp | Single-phase transformer and distribution system using the same |
| CN102982969A (en) * | 2012-11-27 | 2013-03-20 | 宁波澳普网络通信设备有限公司 | Pulse transformer |
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2013
- 2013-03-22 CN CN201310095432.0A patent/CN104064329A/en active Pending
Patent Citations (4)
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| CN1452774A (en) * | 1998-07-06 | 2003-10-29 | 密德康姆股份有限公司 | Multilayer transformer having electrical connection in magnetic core |
| CN2919484Y (en) * | 2006-06-23 | 2007-07-04 | 杨涤东 | No-noise low-magnetic-leakage power supply transformer |
| JP2011142218A (en) * | 2010-01-07 | 2011-07-21 | Toshiba Industrial Products Manufacturing Corp | Single-phase transformer and distribution system using the same |
| CN102982969A (en) * | 2012-11-27 | 2013-03-20 | 宁波澳普网络通信设备有限公司 | Pulse transformer |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525370A (en) * | 2014-12-18 | 2015-04-22 | 佛山市赛科科技股份有限公司 | Deironing device |
| WO2016115952A1 (en) * | 2015-01-19 | 2016-07-28 | 中兴通讯股份有限公司 | Pcb having magnetic core mounting hole, and transformer |
| CN108258912A (en) * | 2015-09-11 | 2018-07-06 | 万国半导体(开曼)股份有限公司 | Pulse transformer |
| CN108258912B (en) * | 2015-09-11 | 2020-04-28 | 万国半导体(开曼)股份有限公司 | Pulse transformer |
| US11664157B2 (en) | 2018-11-02 | 2023-05-30 | Delta Electronics (Shanghai) Co., Ltd. | Magnetic element and method for manufacturing same |
| CN109559868A (en) * | 2018-11-30 | 2019-04-02 | 北京航天微电科技有限公司 | A kind of high power plate electromagnetic interface filter |
| CN112331461A (en) * | 2020-11-03 | 2021-02-05 | 衡山萌泰电子有限公司 | Resonance transformer |
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Effective date of registration: 20160308 Address after: 518000 Tsinghua Research Institute, Nanshan District science and Technology Park, Shenzhen, Guangdong C310 Applicant after: GAOWU ELECTROMAGNETIC TECHNOLOGY (SHENZHEN) CO., LTD. Address before: 65, 243 little North Road, 510060, Guangdong Province, Guangzhou Applicant before: Wang Yong |
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Application publication date: 20140924 |