CN104616865A - Transformer - Google Patents

Transformer Download PDF

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Publication number
CN104616865A
CN104616865A CN201410440748.3A CN201410440748A CN104616865A CN 104616865 A CN104616865 A CN 104616865A CN 201410440748 A CN201410440748 A CN 201410440748A CN 104616865 A CN104616865 A CN 104616865A
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CN
China
Prior art keywords
coil
primary
transformer
screen
tertiary
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.)
Pending
Application number
CN201410440748.3A
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Chinese (zh)
Inventor
曾金辉
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 DBK Electronics Co Ltd
Original Assignee
Shenzhen DBK 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 DBK Electronics Co Ltd filed Critical Shenzhen DBK Electronics Co Ltd
Priority to CN201410440748.3A priority Critical patent/CN104616865A/en
Publication of CN104616865A publication Critical patent/CN104616865A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a transformer. A layer of first coil serving as a primary coil, a layer of second coil serving as a secondary coil, a layer of third coil serving as a primary coil, a layer of fourth coil serving as a secondary coil and a layer of fifth coil serving as a primary coil are wound in the axial direction of a framework, and shielding layers are arranged between the first coil and the second coil, between the second coil and the third coil, between the third coil and the fourth coil and between the fourth coil and the fifth coil respectively. According to the transformer, the winding structure of the primary coil, the secondary coil, another primary coil, another secondary coil and another primary coil is adopted, gaps between the primary coils and the secondary coils are greatly reduced, and leakage inductance is greatly reduced. Meanwhile, total magnetic field intensity of the gaps between the primary coils and the secondary coils is lowered, the total energy of a primary winding space magnetic field and the total energy of a secondary space magnetic field are greatly reduced, and leakage inductance is further reduced and is almost 2-4% of primary inductance. Due to the fact that the leakage inductance is reduced, loss of the transformer and voltage loss are greatly reduced.

Description

A kind of transformer
Technical field
The invention belongs to field transformer, more precisely, relate to the voltage device that a kind of leakage inductance is little.
Background technology
Transformer belongs to a kind of element of energy transferring, conversion, storage, release, can be used for the flyback topologies structure power conversion of AC input, DC output, be widely used in the power supply of electric consumers, carry out voltage transformation, Secure isolation, store and release energy.Transformer can be operated in DCM (discontinuous), CRM (critical continuous mode), CCM (completely continuous) pattern, magnetic core center pillar needs to grind air gap, to support the direct current flux that larger DC magnetizing current causes, the slope of BH magnetic hysteresis loop diminishes, and due to the existence of air gap, energy storage, in air gap (magnetic resistance), reduces residual magnetic flux density, adds the scope of AC flux density.
In current low-voltage and high-current flyback topologies structure power application conversion, transformer all adopts the bakelite skeleton of magnetic core+routine to carry out coiling, it is a kind of axial winding method, the method adopted just presss from both sides time open sandwich winding, owing to being subject to technique for coiling, wire enamel skin thickness, the impact of the thickness of safety insulation gummed paper, the relative distance of primary and secondary is larger, have larger leakage inductance and leakage field, elementary leakage inductance is: L s0n 1 2l avk s/ l (c+ (b+d)/3) (1);
μ 0for permeability of vacuum, μ 0=4 π × 10 -7h/M=0.4 π × 10 -8h/cm
Wherein l represents window width, and c represents primary and secondary winding space, and b represents elementary and takies window height, and d represents secondary and takies window height.
From formula, elementary leakage inductance is directly proportional to the secondary number of turn square, is inversely proportional to window width, is directly proportional to winding space, and leakage inductance is approximately 8% ~ 10% of primary inductance, and it is secondary that this leakage inductance does not have linkage to arrive, and result in larger loss and the loss of voltage.
The loss caused is: P=1/2L lS× I sPK 2× f s(2)
L lSfor primary leakage inductance is refracted to secondary leakage inductance by the turn ratio;
I sPKit is secondary peak value electric current;
The loss of voltage causing leakage inductance to be lost is: V lS=L lS× I sPK/ T (1-D) (3)
Above-mentioned formula can be found out, traditional technique for coiling leakage inductance is relatively large, and the efficiency of transformer is relatively low.And for reducing the high-frequency ac impedance increase that skin effect causes, secondary general employing litz wire, it is made up of many fine rules, easily fractures during operation, and loss often can be caused to increase.
Summary of the invention
The present invention, in order to solve problems of the prior art, provides a kind of transformer.
In order to realize above-mentioned object, technical scheme of the present invention is: a kind of transformer, comprise skeleton, axial direction along skeleton is wound around one deck first coil as primary coil, as one deck second coil of secondary coil, as one deck tertiary coil of primary coil, as one deck the 4th coil of secondary coil, as one deck the 5th coil of primary coil, between the first coil and the second coil, second coil and tertiary coil, tertiary coil and the 4th coil, the first screen is respectively arranged with between 4th coil and the 5th coil, secondary shielding layer, 3rd screen, 4th screen, wherein, together, described second coil, the 4th coils connected in series are together for the first coil, tertiary coil, the 5th coils connected in series.
Preferably, described second coil, the 4th coil adopt flat enamelled wire, and described first coil, tertiary coil, the 5th coil adopt TEX-E insulated electric conductor.
Preferably, the diameter of described TEX-E insulated electric conductor is 0.43mm.
Preferably, described first screen, secondary shielding layer, the 3rd screen, the 4th screen adopt gum Copper Foil.
Preferably, the number of turn of described first coil, tertiary coil, the 5th coil is respectively nine circles; The number of turn of described second coil, the 4th coil is two circles.
Preferably, the 6th coil as primary coil, the 7th coil as secondary coil for powering also is wound with successively in the outside of the 5th coil.
Preferably, the 5th screen is also provided with in the outside of described 7th coil.
Transformer of the present invention of the present invention, is divided into three parts by elementary, is divided into two parts secondary, have employed first-secondary-first-secondary-first winding structure, constitute the double-deck sandwich winding that just folder is secondary, this just makes the gap greatly reduced between primary and secondary, thus substantially reduces leakage inductance.Simultaneously because primary and secondary has double-layer staggered, so the total magnetic intensity at primary and secondary interval reduces, armature winding space magnetic field gross energy and secondary spatial magnetic field gross energy also can greatly reduce, and further reduce leakage inductance, leakage inductance is approximately 2% ~ 4% of primary inductance.Because leakage inductance reduces, the loss of transformer and the loss of voltage just reduce a lot.Because secondary coil is flat copper enamelled wire winding, first, the gap between less primary and secondary, decreases leakage inductance, and skin effect becomes very little simultaneously, makes product can be applied in larger current density, ensure that the safety distance needed for certification.The efficiency of this transformer can improve 3% ~ 5% than traditional transformer.There is screen between adjacent primary and secondary, totally four layers, receive elementaryly, decrease the distributed capacitance between primary and secondary, and create electrostatic screen effect, reduce common mode noise current.
Accompanying drawing explanation
Fig. 1 shows transformer coiling distribution map of the present invention.
Fig. 2 shows the electrical connection diagram of transformer of the present invention.
Embodiment
The technical problem solved to make the present invention, the technical scheme of employing, the technique effect easy to understand obtained, below in conjunction with concrete accompanying drawing, be described further the specific embodiment of the present invention.
With reference to figure 1, the invention provides a kind of transformer, comprise skeleton 2 and be wound on secondary coil, the primary coil on skeleton 2, the cross section of the preferred skeleton 2 of the present invention is in " work " font.
Axial direction along skeleton 2 is wound around one deck first coil (N1) 2 as primary coil, one deck second coil (N2) 4 as secondary coil, one deck tertiary coil (N3) 6 as primary coil, the one deck the 4th coil (N4) 8 as secondary coil, one deck the 5th coil (N5) 10 as primary coil.That is, the first coil 2, second coil 4, tertiary coil 6, the 4th coil 8, the 5th coil 10 are respectively along the axial direction coiling of skeleton 2.Wherein as the first coil 2 of primary coil, tertiary coil 6, the 5th coil 10 adopt close around mode, and as the second coil 4 of secondary coil, the 4th coil 8 adopt all around mode.
Between the first coil 2 and the second coil 4, the second coil 4 and tertiary coil 6, tertiary coil 6 and the 4th coil 8, between the 4th coil 8 and the 5th coil 10, be respectively arranged with the first screen 3, secondary shielding layer 5, the 3rd screen 7, the 4th screen 9; That is screen is equipped with at adjacent two between secondary coil and primary coil.Wherein, the first coil 2, tertiary coil 6, the 5th coil 10 are cascaded, as armature winding; Described second coil 4, the 4th coil 8 are cascaded, as secondary winding.
The winding electrical connection of transformer of the present invention, as Fig. 2, is divided into three parts by elementary, is divided into two parts secondary, have employed first-secondary-first-secondary-first winding structure, constitute the double-deck sandwich winding that just folder is secondary, this just makes the gap greatly reduced between primary and secondary, according to L s0n 1 2l avk s/ l (c+ (b+d)/3), thus substantially reduce leakage inductance.Simultaneously because primary and secondary has double-layer staggered, so the total magnetic intensity at primary and secondary interval reduces, armature winding space magnetic field gross energy and secondary spatial magnetic field gross energy also can greatly reduce, and further reduce leakage inductance, leakage inductance is approximately 2% ~ 4% of primary inductance.Because leakage inductance reduces, the loss so caused according to formula is: P=1/2L lS× I sPK 2× f s; V lS=L lS× I sPK/ T (1-D), the loss of transformer and the loss of voltage just reduce a lot.
Preferably, described second coil 4, the 4th coil 8 adopt flat enamelled wire in the present invention, and described first coil 2, tertiary coil 6, the 5th coil 10 adopt TEX-E insulated electric conductor.Because secondary coil is flat copper enamelled wire winding, first, the gap between less primary and secondary, decreases leakage inductance, and skin effect becomes very little simultaneously, makes product can be applied in larger current density, ensure that the safety distance needed for certification.
In the execution mode that the present invention one is concrete, the diameter of described TEX-E insulated electric conductor is 0.43mm.Described first screen 3, secondary shielding layer 5, the 3rd screen 7, the 4th screen 8 adopt gum Copper Foil.The number of turn of described first coil 2, tertiary coil 6, the 5th coil 10 is respectively nine circles; The number of turn of described second coil 4, the 4th coil 8 is two circles.
The efficiency of this transformer can improve 3% ~ 5% than traditional transformer.There is screen between adjacent primary and secondary, totally four layers, receive elementaryly, decrease the distributed capacitance between primary and secondary, and create electrostatic screen effect, reduce common mode noise current.
Transformer of the present invention, is also wound with the 6th coil (N6) 11 as primary coil for powering, the 7th coil (N7) 12 as secondary coil successively in the outside of the 5th coil 10.The 5th screen 13 is also provided with in the outside of described 7th coil 12.
The present invention is by preferred embodiment having carried out detailed explanation.But, by studying carefully above, concerning the change of each execution mode with to increase be apparent for one of ordinary skill in the art.Being intended that these changes all and increasing of applicant has all dropped in scope that the claims in the present invention protect.

Claims (7)

1. a transformer, comprise skeleton, it is characterized in that: the axial direction along skeleton is wound around one deck first coil as primary coil, one deck second coil as secondary coil, one deck tertiary coil as primary coil, one deck the 4th coil as secondary coil, one deck the 5th coil as primary coil, between the first coil and the second coil, the second coil and tertiary coil, tertiary coil and the 4th coil, between the 4th coil and the 5th coil, be respectively arranged with the first screen, secondary shielding layer, the 3rd screen, the 4th screen; Wherein, together, described second coil, the 4th coils connected in series are together for the first coil, tertiary coil, the 5th coils connected in series.
2. transformer according to claim 1, is characterized in that: described second coil, the 4th coil adopt flat enamelled wire, and described first coil, tertiary coil, the 5th coil adopt TEX-E insulated electric conductor.
3. transformer according to claim 2, is characterized in that: the diameter of described TEX-E insulated electric conductor is 0.43mm.
4. the transformer according to any one of claims 1 to 3, is characterized in that: described first screen, secondary shielding layer, the 3rd screen, the 4th screen adopt gum Copper Foil.
5. transformer according to claim 4, is characterized in that: the number of turn of described first coil, tertiary coil, the 5th coil is respectively nine circles; The number of turn of described second coil, the 4th coil is two circles.
6. transformer according to claim 5, is characterized in that: be also wound with the 6th coil as primary coil for powering, the 7th coil as secondary coil successively in the outside of the 5th coil.
7. transformer according to claim 6, is characterized in that: be also provided with the 5th screen in the outside of described 7th coil.
CN201410440748.3A 2014-09-02 2014-09-02 Transformer Pending CN104616865A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410440748.3A CN104616865A (en) 2014-09-02 2014-09-02 Transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410440748.3A CN104616865A (en) 2014-09-02 2014-09-02 Transformer

Publications (1)

Publication Number Publication Date
CN104616865A true CN104616865A (en) 2015-05-13

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Country Link
CN (1) CN104616865A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107622865A (en) * 2016-07-14 2018-01-23 钟杰元 Multiply polyurethane enamel covered wire power transformer
CN108173431A (en) * 2016-12-07 2018-06-15 特变电工新疆新能源股份有限公司 High voltage direct current based on synchronous conducting technology takes can converter
CN109411223A (en) * 2018-11-15 2019-03-01 宁夏银利电气股份有限公司 A kind of production method of high frequency transformer
CN110636953A (en) * 2018-09-18 2019-12-31 深圳欣锐科技股份有限公司 Integrated vehicle-mounted charger circuit, manufacturing method thereof and integrated vehicle-mounted charger

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070171585A1 (en) * 2006-01-25 2007-07-26 Delta Electronics, Inc. Method for suppressing common mode noise
US20100165671A1 (en) * 2008-06-30 2010-07-01 Cambridge Semiconductor Limited Switched-mode Power Supplies
CN102231318A (en) * 2011-04-11 2011-11-02 上海新进半导体制造有限公司 Method and transformer for reducing common-mode interference in sandwich winding transformer
CN202487310U (en) * 2012-03-27 2012-10-10 合肥吉源电子有限公司 Novel high shield high frequency transformer
CN202855504U (en) * 2012-09-03 2013-04-03 上为(福建)电子有限公司 Modified sandwich winding transformer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070171585A1 (en) * 2006-01-25 2007-07-26 Delta Electronics, Inc. Method for suppressing common mode noise
US20100165671A1 (en) * 2008-06-30 2010-07-01 Cambridge Semiconductor Limited Switched-mode Power Supplies
CN102231318A (en) * 2011-04-11 2011-11-02 上海新进半导体制造有限公司 Method and transformer for reducing common-mode interference in sandwich winding transformer
CN202487310U (en) * 2012-03-27 2012-10-10 合肥吉源电子有限公司 Novel high shield high frequency transformer
CN202855504U (en) * 2012-09-03 2013-04-03 上为(福建)电子有限公司 Modified sandwich winding transformer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107622865A (en) * 2016-07-14 2018-01-23 钟杰元 Multiply polyurethane enamel covered wire power transformer
CN108173431A (en) * 2016-12-07 2018-06-15 特变电工新疆新能源股份有限公司 High voltage direct current based on synchronous conducting technology takes can converter
CN110636953A (en) * 2018-09-18 2019-12-31 深圳欣锐科技股份有限公司 Integrated vehicle-mounted charger circuit, manufacturing method thereof and integrated vehicle-mounted charger
CN109411223A (en) * 2018-11-15 2019-03-01 宁夏银利电气股份有限公司 A kind of production method of high frequency transformer

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Application publication date: 20150513

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