CN1725390A - Iron-core and phase-reversing transformer using the iron-core - Google Patents

Iron-core and phase-reversing transformer using the iron-core Download PDF

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Publication number
CN1725390A
CN1725390A CNA2005100850596A CN200510085059A CN1725390A CN 1725390 A CN1725390 A CN 1725390A CN A2005100850596 A CNA2005100850596 A CN A2005100850596A CN 200510085059 A CN200510085059 A CN 200510085059A CN 1725390 A CN1725390 A CN 1725390A
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China
Prior art keywords
leg
secondary coil
primary winding
iron core
mentioned
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CNA2005100850596A
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Chinese (zh)
Inventor
稻垣隆章
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TDK Corp
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TDK Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support

Abstract

The present invention provides a ferrite core and inverter transformer which can be made more efficient by a one-input and multiple-output structure and can be further reduced in the number of components and cost and has a high installation area reduction effect.The ferrite core comprises a leg portion 2 for a primary coil around which a primary coil 7 is to be wound, and leg portions 3, 4 and 5 for a secondary coil around which secondary coils 8, 9 and 10 are to be wound. These leg portions 3, 4 and 5 are magnetically coupled by a coupling portion 6. There are three or more leg portions 3, 4 and 5 for a secondary coil as opposed to just one leg portion 2 for a primary coil, and the leg portions 3, 4 and 5 for a secondary coil are formed at such positions that they may have nearly the same magnetic resistance with respect to the leg portion 2 for a primary coil. To be more specific, the distance between each of the leg portions 3, 4 and 5 for a secondary coil and the leg portion 2 for a primary coil is set nearly the same.

Description

Iron core and utilize the inverter transformer of this iron core
Technical field
The present invention relates to a kind ofly have many legs sections cores a plurality of secondary coil legs, so-called, and relate to the inverter transformer that utilizes this kind iron core with respect to a primary winding leg.
Background technology
For example, the inverter transformer of control change in voltage normally makes identical shaped a pair of iron core combination in the lamp circuit of the backlight of lighting liquid crystal indicator etc., constitute closed flux path, on the iron core that combines, twine different primary winding and the secondary coils of the number of turns simultaneously and constitute.The basic configuration of iron core, it is representative with avris magnetic core with central magnetic core and its bilateral symmetry setting with the E font iron core that connecting portion is connected that the U font iron core of a pair of foot is arranged with the connecting portion two ends.
Fig. 8 is the schematic diagram of an example that has adopted the inverter transformer of general U font iron core 101.In the U font iron core 101, a pair of leg 102 parallel to each other carries out magnetic by connecting portion 103 and connects, and again a pair of U font iron core 101 is carried out magnetic by two front ends of leg 102 and connects, and has constituted the closed flux path of ring-type.And, on the leg 02 of a side, twined primary winding 104, twined the secondary coil 105 different on the leg 102 of opposite side with primary winding 104 number of turns, constituted inverter transformer thus.The difference that the inverter transformer of this structure can be set according to the number of turns of primary winding 104 and secondary coil 105, and obtain required voltage.
Fig. 9 is the schematic diagram of an example that has adopted the inverter transformer of E font iron core 111.In the E font iron core 111, carry out magnetic with a pair of avris magnetic core 113 by connecting portion 114 as the central magnetic core 112 of leg and be connected.In E font iron core 111, also connect to come combination by two front ends of central magnetic core 112 and avris magnetic core 113 by a pair of E font iron core 111, constitute closed flux path.
But, for example for liquid crystal indicator, along with the development to big picture direction, the set backlight quantity in the liquid crystal board back side also has the trend of increase, and it is essential that this just feasible increase of controlling the quantity of the inverter transformer of lighting the required high voltage variation of backlight becomes.In each above-mentioned inverter transformer, primary winding and secondary coil are one to one, and a corresponding backlight also must use an inverter transformer.
But use in the structure of an inverter transformer at a backlight, also must increase the quantity of inverter transformer along with the increase of backlight number, so can cause the reduction of the operating efficiency that the increase owing to number of parts causes and the increase of cost of parts, the increase that inverter transformer is realized required area, and have the danger that liquid crystal indicator is difficult to miniaturization.Therefore, because above-mentioned situation has proposed a kind of inverter transformer, as long as single this transformer can be lighted 2 backlights.(for example, with reference to patent documentation 1 and patent documentation 2 etc.).
Specifically, a kind of 2 outer legs that twined secondary coil that are provided with are disclosed in patent documentation 1,1 outer leg that has twined primary winding is set simultaneously, and makes in addition that leg disposes in opposite directions, and the middle foot subtend configuration between outer leg and the inverter transformer that constitutes.In patent documentation 2, disclose a kind of for the identical magnetic that carries out with spiral is connected, and with the configuration of 2 secondary coils and primary winding subtend, wherein closed flux path magnetic core is to be connected the inverter transformer of the second magnetic core be combined into of first magnetic core that leg is formed by connecting and offset flat shape with second leg usefulness in being plugged on the second roll through hole by being plugged on first leg in the first roll through hole.
[patent documentation 1] spy opens the 2003-22917 communique
[patent documentation 2] spy opens the 2003-309026 communique
Yet in the invention of these patent documentations record, the outer leg that all twines secondary coil is set to a plurality of, is 2 example and only occurred outer leg quantity in the actual disclosed document, is never put down in writing greater than 2 structures.Liquid crystal indicator develops to big picture direction gradually, and the number of backlight has the trend of increase especially, and in this kind situation, is 2 with the numerical limitations of outer leg, then can produce restriction in the reduction of number of parts, is difficult to dwindle real area.And, under the situation that outer leg number increases, need the technology of the alarming situations such as instability of the output current that a kind of instability that can eliminate magnetic resistance causes especially.
Summary of the invention
The present invention has used for reference above actual conditions in the past and has proposed.Promptly, the object of the present invention is to provide a kind of iron core, it realizes high efficiency by the corresponding a plurality of outputs of input, further cuts down possibility that be collapsed into of number of parts and cost, reduces to be provided with area significantly, the while also provides a kind of inverter transformer.In addition, the present invention also aims to, a kind of instability of eliminating the output current that is brought by the instability of magnetic resistance is provided, the secondary coil that is wound in each outer leg (secondary coil leg) is realized the iron core and the inverter transformer of impartial output.
The inventor in order to achieve the above object, carried out for a long time, lastingly, repeatedly various investigations and test.Its result, be equipped with secondary coil leg more than 3 for 1 primary winding leg, can reach the effect that number of parts is significantly cut down, for example, even can obtain under the situation that the quantity to backlight significantly increases, with outer leg number is that 2 o'clock situation is compared, and no matter is the correspondence or the reduction of real area but also can make, and the large increase of reaching is all arranged.
The present invention is based on such opinion and finishes, iron core of the present invention is characterised in that, comprise primary winding leg that twines primary winding and the secondary coil leg that twines secondary coil, and by connecting portion above-mentioned leg is carried out magnetic and connect, has secondary coil leg more than 3 for 1 primary winding leg, simultaneously for above-mentioned primary winding leg, these secondary coil legs are formed on magnetic resistance value about equally position all respectively.
And, inverter transformer of the present invention is characterised in that, comprise the 1st iron core, primary winding and secondary coil and the 2nd iron core, wherein said the 1st iron core has primary winding leg that twines primary winding and the secondary coil leg that twines secondary coil, and by connecting portion above-mentioned leg is carried out magnetic and connect, described primary winding and secondary coil are wrapped in each leg of above-mentioned the 1st iron core, and described the 2nd iron core is connected each leg of above-mentioned the 1st iron core, constitutes closed flux path with above-mentioned the 1st iron core; And above-mentioned the 1st iron core has secondary coil leg more than 3 for 1 primary winding leg, and simultaneously for above-mentioned primary winding leg, these secondary coil legs are formed on its magnetic resistance value about equally position all respectively.
Iron core of the present invention and inverter transformer possess for 1 primary winding leg and have secondary coil leg more than 3, and therefore relative 1 input will have 3 outputs.Herein, each secondary coil leg is formed on for primary winding leg magnetic resistance value about equally position all respectively, and therefore, output current can not produce difference, can impartial export.
And, owing to the secondary coil leg that has for 1 primary winding leg more than 3, with be provided with primary winding and secondary coil one to one 3 situations with upper core (inverter transformer) be identical, so number of parts can be reduced to below 1/3, cost of parts also will decline to a great extent thereupon.
And the reduction effect that reaches on this problem of area is also quite big being provided with.For example, have the iron core (inverter transformer) of 2 secondary coil legs with respect to 1 primary winding leg, be provided with primary winding and secondary coil one to one 2 iron cores (inverter transformer) compare, area is set too big variation can not take place.But in contrast thereto, have the iron core (inverter transformer) of 3 secondary coil legs with respect to 1 primary winding leg, be provided with primary winding and secondary coil one to one 3 iron cores (inverter transformer) compare, reduced to be provided with area.Along with the increase of secondary coil leg quantity, the advantage that area reduces thereupon is set will highlight.
The effect of invention
Based on iron core among the present invention and inverter transformer, can realize the high efficiency that the corresponding many outputs of input bring, thereby make the possibility that is collapsed into of cutting down a considerable amount of number of parts and cost.In addition,, for example, compare, can significantly cut down area is set with the iron core (inverter transformer) that has 2 secondary coil legs with respect to 1 primary winding leg based on the present invention.
Description of drawings
Fig. 1 is an example using iron core of the present invention, (a) is the plane graph of the iron core of 3 outputs of corresponding 1 input, (b) is side view.
Fig. 2 is and 3 plane graphs of exporting other example of corresponding iron core of 1 input.
Fig. 3 is the plane graph that primary winding on the iron core shown in Figure 1 and secondary coil twine state.
Fig. 4 is a side view of using an example of the inverter transformer that iron core shown in Figure 1 constitutes.
Fig. 5 be with 4 corresponding iron cores of output of 1 input on primary winding and the plane graph of secondary coil winding state.
Fig. 6 (a) is provided with primary winding and the secondary coil plane graph during 2 inverter transformers one to one, (b) is the plane graph when being provided with 2 secondary coil legs for 1 primary winding leg.
Fig. 7 (a) is provided with primary winding and the secondary coil plane graph during 3 inverter transformers one to one, is for 1 primary winding leg (b), the plane graph when being provided with 3 secondary coil legs.
Fig. 8 is the side view of an example of using the transformer of U font iron core in the past.
Fig. 9 is the side view of an example of using the transformer of E font iron core in the past.
Symbol description
1: iron core, 2,31,52,61,71: the primary winding leg, 3,4,5,33,34,35,36,53,62,63,72,73,74: the secondary coil leg, 6: connecting plate, 7,37,54,64,75: primary winding, 8,9,10,38,39,40,41,55,65,66,76,77,78: secondary coil, 11: tabular magnetic core, 20,51: inverter transformer
Embodiment
With reference to the accompanying drawings iron core of the present invention and inverter transformer are described.
The (a) and (b) of Fig. 1 represent to adopt an example of iron core of the present invention.The iron core 1 of present embodiment is when core has disposed the primary winding leg, disposed the secondary coil leg 3,4,5 that (is 3 herein) more than 3 again around it, and their magnetic is connected and formation with tabular connecting portion 6.In addition, 3 secondary coil legs the 3,4, the 5th herein are provided with the angle intervals of isogonism roughly around primary winding leg 2.
Above-mentioned primary winding leg 2, secondary coil leg 3,4,5 and connecting portion 6 can be by ferrite (ferrite) material, with method integral productions such as sintering.Ferrite Material can use Mn-Zn ferrite etc., or Ferrite Material arbitrarily, but in order to improve performance, preferably uses the good Ferrite Material of the high soft magnetic characteristic of magnetic susceptibility and magnetic density.
In addition, above-mentioned primary winding leg 2, secondary coil leg 3,4,5 are cylindrical in the present embodiment, but are not limited thereto, and also can make the arbitrary shape of triangular prism shape, polygonal column etc.The shape of connecting portion 6 is also identical, made herein and have and primary winding leg, whole secondary coil legs 3,4,5 all can be comprised the rectangular plate shape of size wherein, but also can be to make primary winding leg 2, secondary coil leg 3,4,5 form the arbitrary shape of the flux path that links up.Such as, as shown in Figure 2, also can remove unwanted part in the connecting portion 6, and form the summary Y word shape that only constitutes the flux path part.
As shown in Figure 3, in above-mentioned iron core 1, around primary winding leg 2, twined primary winding 7, twined secondary coil 8,9,10 respectively on each secondary coil leg 3,4,5, simultaneously, as shown in Figure 4, the tabular magnetic core 11 as the 2nd iron core is engaged with the front end face of primary winding leg 2 and secondary coil leg 3,4,5, constituted inverter transformer 20.
In this inverter transformer 20, constituted the 1st transformer by primary winding leg 2 and secondary coil leg 3 and primary winding 7 and secondary coil 8, the change in voltage and the output of stipulating by secondary coil 8.In like manner, by primary winding leg 2 and secondary coil leg 4, and primary winding 7 and secondary coil 9 constituted the 2nd transformer, and by primary winding leg 2 and secondary coil leg 5, and primary winding 7 and secondary coil 10 have constituted the 3rd transformer.This has just realized corresponding 3 output functions of 1 input of described inverter transformer 20.
In the inverter transformer 20 of above-mentioned structure, the number of turns ratio of the number of turns of primary winding 7 and secondary coil 8,9,10 will suitably be set according to required voltage.On the other hand, under the certain situation of the output of each secondary coil 8,9,10, the number of turns of each secondary coil 8,9,10 is identical.
Herein, in order to obtain certain output from each secondary coil 8,9,10, secondary coil leg 3,4,5 is extremely important to the distance of primary winding leg 2, with respect to above-mentioned primary winding leg 2, is necessary each secondary coil leg 3,4,5 is set to magnetic resistance position about equally.Therefore, in the iron core 1 of this form of implementation, the distance between each secondary coil leg 3,4,5 of decision design and the above-mentioned primary winding leg 2 equates.
As shown in Figure 1, the distance between each secondary coil leg 3,4,5 and the above-mentioned primary winding leg 2 is respectively L 1, L 2, L 3When the magnetic resistance between each secondary coil leg 3,4,5 of consideration and the above-mentioned primary winding leg 2, flux path in the middle of them is made of connecting plate 6 with regard to needing, and because between each secondary coil leg 3,4,5 and the above-mentioned primary winding leg 2, connecting plate 6 need have sufficient cross-sectional area, is certain so can suppose the cross-sectional area A of flux path herein.
If constituting the magnetic susceptibility of the connecting plate 6 of flux path is μ, the magnetic resistance R of 2 of secondary coil leg 3 and primary winding legs then 1Can be expressed as R 1=L 1/ μ A.In like manner, the magnetic resistance R of 2 of secondary coil leg 4 and primary winding legs 2Can be expressed as R 2=L 2/ μ A, the magnetic resistance R that secondary coil 5 and primary winding are 2 3Can be expressed as R 3=L 3/ μ A.As mentioned above, the cross-sectional area A of flux path is certain, also is the flux path that constitutes by with a plate 6, so magnetic susceptibility μ is also certain.Each secondary coil is certain with the magnetic resistance between leg 3,4,5 and the above-mentioned primary winding leg 2, promptly in order to make R 1=R 2=R 3, need be with L 1=L 2=L 3Get final product.
According to the above description, made up inverter transformer 1 corresponding 3 output of input, that can carry out identical output by each secondary coil 8,9,10, for identical consideration, also can make up corresponding 3 more than the output of 1 input simply, for example the inverter transformer of 1 corresponding 4 output of input.
Fig. 5 represents an example of the inverter transformer of 1 corresponding 4 output of input.In this example, around the primary winding leg 31 of centre, promptly 4 of square connecting plate 32 jiaos, prepare secondary coil leg 33～36 respectively, on primary winding leg 31, twine primary winding 37, on secondary coil 33～36, twine secondary coil 38～41 respectively.And the distance that primary winding leg 31 and each secondary coil leg are 33～36 equates.Thus, constituted the inverter transformer of 1 corresponding 4 output of input, each secondary coil 38～41 output is also roughly certain.
In inverter transformer of the present invention, as previously mentioned, can realize the inverter transformer of 1 corresponding 3 output of input, 11 corresponding a plurality of output of input such as corresponding 4 outputs of input, and realize the reduction of number of parts and the compression of cost of parts.And, especially when consider inverter transformer area is set the time, with respect to 1 primary winding leg, it is very effective that 3 above secondary coil legs are set, and is explained below.
Schematic diagram when Fig. 6 is corresponding 2 outputs of 1 input is that primary winding and the secondary coil situation of 2 inverter transformers 51 one to one is set (a), (b) is the situation that is provided with 2 secondary coil legs 62,63 for 1 primary winding leg 61.Among Fig. 6 (a), each inverter transformer 51 is made of 1 primary winding leg 52 and 1 secondary coil leg 53, and is corresponding therewith, is provided with primary winding 54 and secondary coil 55 each 1 again.Among Fig. 6 (b), on primary winding leg 61, twine in the secondary coil 64, on secondary coil leg 62,63, twine secondary coil 65,66 again separately.
Herein, if consider the situations such as interference of each transformer bay, suppose with between the interval of primary winding and secondary coil and each secondary coil be set to designated value the time, the primary winding leg 52 in each inverter transformer 51 of Fig. 6 (a) and the interval a of secondary coil leg 53 1, with the inferior primary winding leg 61 in the inverter transformer of Fig. 6 (b) and the interval a of secondary coil leg 62,63 2Must be about equally.And the interval b that the secondary coil leg in the inverter transformer 51 among Fig. 6 (a) is 53 1, and the interval b of 62,63 of secondary coil legs in the inverter transformer of Fig. 6 (b) 2Also must equate.
In Fig. 6 (a), area is set can uses a of 2 inverter transformers 1* b 1Expression, and in Fig. 6 (b), area is set can uses a of inverter transformer 2* b 2Expression.As mentioned above, because a 1=a 2, b 1=b 2So, a 1* b 1=a 2* b 2, their area that is provided with is almost not change.
Secondly, consider the situation of 1 corresponding 3 output of input.Schematic diagram when Fig. 7 is 3 outputs of 1 input correspondence, (a) be to be provided with primary winding and the secondary coil situation of 3 inverter transformers 51 one to one, (b) be the situation that 3 secondary coil legs 72,73,74 are set with respect to 1 primary winding leg 71.In Fig. 7 (b), on primary winding leg 71, twine in the primary winding 75, on each secondary coil leg 72,73,74, twine secondary coil 76,77,78 respectively.
In Fig. 7 (a), area is set can uses a of 3 inverter transformers 3* b 3Expression, 3 inverter transformers are arranged side by side, so the length b in its orientation 3Will be bigger, area is set also can be very big.And in Fig. 7 (b), the inverter transformer of 1 corresponding 3 output of input is provided with area and can uses a 4* b 4Expression.At this moment, the length b in the orientation of secondary coil leg 72,73,74 especially 4With above-mentioned length b 3Compared significantly and to have cut down, therefore, area has been set compares with Fig. 7 (a) occasion significantly reduction has also been arranged.In addition, under the situation of 1 corresponding 4 output of input, also can adopt the be provided with area identical, can make the effect of cutting down area more remarkable with corresponding 3 outputs of 1 input shown in above-mentioned Fig. 7 (b).

Claims (6)

1. an iron core is characterized in that,
Have primary winding leg that twines primary winding and the secondary coil leg that twines secondary coil, and carry out the magnetic connection by connecting portion;
For 1 primary winding leg, have 3 above secondary coil legs, simultaneously for above-mentioned primary winding leg, above-mentioned each secondary coil leg is formed on separately the magnetic resistance position about equally.
2. iron core as claimed in claim 1 is characterized in that, sets the distance state between each secondary coil leg and the above-mentioned primary winding leg about equally.
3. iron core as claimed in claim 2 is characterized in that the cross-sectional area of above-mentioned each secondary coil leg about equally.
4. an inverter transformer is characterized in that,
Have: the 1st iron core, described iron core comprise primary winding leg that twines primary winding and the secondary coil leg that twines secondary coil, and carry out the magnetic connection by connecting portion;
Be wound in the primary winding and the secondary coil of each leg of above-mentioned the 1st iron core;
The 2nd iron core, described iron core combines with each leg of above-mentioned the 1st iron core, constitutes closed flux path with above-mentioned the 1st iron core;
For 1 primary winding leg, above-mentioned the 1st iron core has the secondary coil leg more than 3, and simultaneously for the above-mentioned leg of coil again and again, above-mentioned each secondary coil leg is formed on separately the magnetic resistance position about equally.
5. inverter transformer as claimed in claim 4 is characterized in that, in above-mentioned the 1st iron core, set between above-mentioned each secondary coil leg and the above-mentioned primary winding leg distance about equally.
6. inverter transformer as claimed in claim 5 is characterized in that the cross-sectional area of above-mentioned each secondary coil leg about equally.
CNA2005100850596A 2004-07-21 2005-07-20 Iron-core and phase-reversing transformer using the iron-core Pending CN1725390A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004213550 2004-07-21
JP2004213550A JP2006032861A (en) 2004-07-21 2004-07-21 Ferrite core and inverter transformer using same

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CN1725390A true CN1725390A (en) 2006-01-25

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KR (1) KR20060053941A (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101707121B (en) * 2008-07-25 2013-05-08 塞瑞斯逻辑公司 Transformer with split primary winding
CN103762064A (en) * 2013-12-27 2014-04-30 华为技术有限公司 Coupling inductor and multi-level power converter

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1835604A1 (en) * 2006-03-16 2007-09-19 STMicroelectronics S.r.l. Magnetic core for a coupled multi coil filter inductor
JP5257204B2 (en) * 2009-03-31 2013-08-07 Ｔｄｋ株式会社 Switching power supply
JP7283425B2 (en) * 2020-03-24 2023-05-30 Tdk株式会社 Magnetic components, power converters, and power conversion systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101707121B (en) * 2008-07-25 2013-05-08 塞瑞斯逻辑公司 Transformer with split primary winding
CN103762064A (en) * 2013-12-27 2014-04-30 华为技术有限公司 Coupling inductor and multi-level power converter
CN103762064B (en) * 2013-12-27 2016-08-31 华为技术有限公司 coupling inductance and multi-level power converter

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JP2006032861A (en) 2006-02-02
TW200609960A (en) 2006-03-16
KR20060053941A (en) 2006-05-22

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