CN100495599C - Transformer - Google Patents

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Publication number
CN100495599C
CN100495599C CNB2006100678458A CN200610067845A CN100495599C CN 100495599 C CN100495599 C CN 100495599C CN B2006100678458 A CNB2006100678458 A CN B2006100678458A CN 200610067845 A CN200610067845 A CN 200610067845A CN 100495599 C CN100495599 C CN 100495599C
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CN
China
Prior art keywords
winding
aforementioned
secondary winding
transformer
elementary winding
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Expired - Fee Related
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CNB2006100678458A
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Chinese (zh)
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CN1841584A (en
Inventor
横原映二
越智卓马
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Sanken Electric Co Ltd
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Sanken Electric Co Ltd
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Publication of CN1841584A publication Critical patent/CN1841584A/en
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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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/325—Coil bobbins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding

Abstract

There provide a low cost and high performance transformer which is adjustable for the optimum value of the leakage inductance without changing the shape of the bobbin. The transformer comprises a primary and secondary windings (1), (2), and a bobbin (10) having a first and second winders (11), (12) for winding the primary and secondary windings (1), (2). Each or one of the first and second winders (11), (12) is separated into a plurality of divisions in the axial direction of the bobbin (10). The ratio of the winding numbers of the separately disposed primary or secondary winding (1), (2) is changed to adjust the leakage inductance with the primary and secondary windings (1), (2), thus easily changing the value of the leakage inductance according to the purpose of use of the transformer.

Description

Transformer
Technical field
The present invention relates to transformer, relate in particular to the transformer that uses in the supply unit of resonance type switching power etc.
Background technology
In order to reduce switching loss and to reduce noise, switching waveform whole or local on utilize the resonance of the leakage inductance (leakage inductance) of transformer and resonance electricity consumption container to move the resonance type switching power increasing day by day.Yet among resonance type switching power, because desired output goes into condition differences such as voltage, thereby best primary inductance or leakage inductance are also different.So, in order to produce the high-performance variable depressor that adapts with its purposes, the inductance of the elementary winding of the suitable selection of need transformer or the value of leakage inductance.
Following Patent Document 1 is that publicity goes out following transformer, and it has disposed elementary winding and secondary winding, and the bobbin with the 2nd coiling portion of the 1st coiling portion of the elementary winding of reeling and coiling secondary winding; The 2nd coiling portion bobbin axially on after separating, through the two ends of flange configurations in the 1st coiling portion.The transformer of Patent Document 1 is by adopting respectively at the central part of three bobbins of the cutting apart elementary winding of reeling, and the structure of both sides coiling secondary winding shortens the distance between elementary winding and the secondary winding, reduces leakage inductance.Because this kind transformer stably adapts to desired value for inductance or the leakage inductance that makes transformer, and make the production lotization of transformer, need the 1st coiling portion and the 2nd coiling portion, the flange that separates elementary winding and secondary winding is set at definite shape made.
Yet, even if the output power of resonance type switching power is identical, transformer often changes because of the output voltage and the peak load of resonance type switching power, the consideration of electrical efficiency when improving usual use the or the power consumption when reducing non-loaded standby etc. needs to change the value of inductance and leakage inductance.In addition, even if transformer is under the situation of the identical leakage inductance of needs, for example under the situation of the resonance type switching power of same input voltage, because output voltage difference, the number of turns of secondary winding is also different, thereby because its leakage inductance difference, condition of resonance is also different, thereby has produced the problem of the best operation condition that departs from transformer.
The inductance value of transformer, the number of turns of available winding and the interval between iron core are adjusted, and be corresponding with it, and the value of leakage inductance then depends on elementary winding and the distance between the width of secondary winding, elementary winding and secondary winding and the area in opposite directions of winding.Because so-called elementary winding and the width of secondary winding and the interval that the distance between elementary winding and secondary winding depends on the flange of bobbin, thereby the value of leakage inductance, its major part depends on the shape of bobbin.Yet, in order to use many expensive moulds to prepare many kinds of bobbins and unrealistic according to making the inductance of transformer and leakage inductance under the various conditions of transformer, all become optimum value.Therefore, among used transformer, the value of inductance and leakage inductance is in conditions such as power converter efficient of sacrificing Switching Power Supply or heat generation, by what form near the value compromise of optimum value as far as possible.
In addition, the transformer that uses in resonance type switching power is because the electric current that flows in constituting the enamelled wire of winding is a sine wave shape, thereby than the switching current of brachmorphy ripple, has that the peak electricity rheology is big, copper loss becomes big trend.In addition, in order to realize the miniaturization of resonance type switching power, set switching frequency very high, be subjected to the influence of the skin effect etc. of copper cash, among the big single line of diameter, it is big that copper loss becomes.So among a part of transformer,, in winding, use the twisted wire that forms by the less fine copper wire strands of high-frequency current loss in order to reduce copper loss.
Yet, because according to the desired safety standard of transformer, must fully guarantee the elementary winding of transformer and space length, leakage distance and the withstand voltage properties between secondary winding and the iron core, thereby must be by on the lead-out wire of winding, inserting insulating sleeve, or guarantee its insulating properties and leakage distance each other with insulating tape.Want to make the whole twisted wires of fine copper wire of bunchy to pierce into very difficulty of insulating sleeve, thereby can't the actual production transformer.In addition, even if the use insulating tape is guaranteed space length and leakage distance between elementary winding and the secondary winding, because twisted wire is very scattered, thereby the poor reliability of transformer.Also have, the operability when using the transformer of twisted wire to make is poor, increases with number and manufacturing cost, thereby has improved the manufacturing unit price of transformer.
Corresponding with it, following Patent Document 2 publicities go out another kind of transformer, and it has disposed elementary winding and secondary winding, and bobbin, and it has reel the 1st coiling portion of elementary winding and the 2nd coiling portion of coiling secondary winding; The 1st coiling portion and the 2nd coiling portion bobbin axially on be separated into a plurality of, through the flange alternate configurations.The transformer of Patent Document 2 is guaranteed its insulating properties by the flange of bobbin being brought up to the space length that can fully keep between elementary winding and the secondary winding and the degree of leakage distance.Therefore the operating efficiency in the time of can improving the manufacturing transformer by omission insulating sleeve and insulating tape.
(Patent Document 1) TOHKEMY 2004-31611 communique
(Patent Document 2) TOHKEMY 7-283037 communique
Summary of the invention
Yet the transformer of Patent Document 2 becomes greatly the profile of transformer owing to set the flange of bobbin very highly, has produced the problem on the product that can't be used for nearest small-sized and slimming.
Therefore, the objective of the invention is to provide a kind of low cost, high performance transformer by addressing the above problem.More specifically, the object of the present invention is to provide a kind of transformer that is easy to adjust the leakage inductance value.In addition, another object of the present invention is to provide a kind of profile little, can fully guarantee the space length between elementary winding and the secondary winding and the transformer of leakage distance.
Transformer of the present invention provides a kind of shape that needn't change bobbin and flange as before leakage inductance can be adjusted to low cost, the high performance transformer of optimum value.Transformer of the present invention comprises: elementary winding and secondary winding; And bobbin, it has volume and scratches the 1st coiling portion of elementary winding and the 2nd coiling portion of coiling secondary winding; The 1st coiling portion and the 2nd coiling portion the two or wherein any one party configured separate on the axis direction of bobbin is a plurality of.Owing to by the elementary winding of change configured separate or the number of turns ratio of secondary winding, be easy to adjust the leakage inductance value of elementary winding and secondary winding, therefore, can be easy to change the value of leakage inductance according to the purposes of transformer.
If adopt the present invention, needn't change the shape of bobbin, when can obtain best leakage inductance value,, therefore can provide the transformer of low-cost and high-performance owing to can fully guarantee space length and leakage distance between elementary winding and the secondary winding.
Description of drawings
Fig. 1 is the ground plan that the execution mode of transformer of the present invention is adopted in expression.
Fig. 2 is the profile along the A-A line of Fig. 1.
Fig. 3 is the installation diagram that has omitted Fig. 1 of winding.
Fig. 4 is the sketch and the characteristic curve chart of structure of the transformer of presentation graphs 1.
Fig. 5 is the sketch and the characteristic curve chart of the transformer device structure of expression the 1st modification.
Fig. 6 is the sketch of the transformer device structure of expression the 2nd modification.
Fig. 7 is the sketch of the transformer device structure of expression the 3rd modification.
Fig. 8 is the sketch of the transformer device structure of expression the 4th modification.
Embodiment
The execution mode of transformer of the present invention is described according to Fig. 1～Fig. 8 below.
As Fig. 1～shown in Figure 3, the transformer of present embodiment has: elementary winding 1 and secondary winding 2, and it is made of enamelled wire; Bobbin 10, it has reel the 1st coiling portion 11 of elementary winding 1 and the 2nd coiling portion 12 of coiling secondary winding 2;
Auxiliary bobbin 9, itself and bobbin 10 walk abreast and disposed adjacent;
The 1st the 6 and the 2nd iron core 7 unshakable in one's determination, itself and bobbin 10 and auxiliary bobbin 9 disposed adjacent and formation magnetic circuit when electric current is flowed through elementary winding 1 and secondary winding 2;
Supporter 5, it has a plurality of terminals 15 that are connected with substrate.
As shown in Figure 3, the 1st coiling portion 11 and the 2nd coiling portion 12 are the tubular with pair of openings 10a; Have flange 4, it is formed between the 1st coiling portion 11 and the 2nd coiling portion 12; A pair of flange part 13, it is positioned at the two ends of bobbin 10.As the illustrative transformer of present embodiment, as Figure 1 and Figure 2, by bobbin 10 axially on be configured to the two ends of the 2nd coiling portion 12 of the few secondary winding of the coiling number of turns 2 after separating the 1st coiling portion 11 of the many elementary windings 1 of the coiling number of turns.Elementary winding 1 and secondary winding 2 are the center through flange 4 alternate configurations with the 2nd coiling portion 12, dispose the 1st coiling portion 11 in the outside of the 2nd coiling portion 12 with released state.Auxiliary bobbin 9 is identical with bobbin 10, forms the tubular with pair of openings 9a, and two ends have flange part 14.Reeling on the auxiliary bobbin 9 and be different from the secondary winding (not shown) of the secondary winding 2 of reeling on the bobbin 10.
Bobbin 10 is arranged on the surperficial 5c of supporter 5, tabular 13a of the portion that is provided with that forms on the bottom of flange part 13 and supporter 5 butts.The 11, the 2nd coiling portion 12 of the 1st coiling portion, flange 4 and the flange part 13 that constitute bobbin 10 can be used synthetic resin and so on monolithic molding.The 1st the 6 and the 2nd iron core 7 unshakable in one's determination is set at the EE iron core shape that forms with ferrite and so on.The 1st the 6 and the 2nd iron core 7 unshakable in one's determination has respectively from the cardinal principle central part of main body 6d, 7d at right angles outstanding main leg 6a, 7a; By the end of main body 6d, 7d towards with main leg 6a, excitatory pin 6b, 7b that the same direction of 7a is outstanding; By the other end of main body 6d, 7d towards with main leg 6a, saturated leg 6c, 7c that the same direction of 7a is outstanding.Main leg 6a, 7a are configured in the cavity of bobbin 10, and saturated leg 6c, 7c are configured in the cavity of auxiliary bobbin 9.The configuration that contacts with each other of excitatory pin 6b, the 7b of the 1st the 6 and the 2nd iron core 7 unshakable in one's determination and saturated leg 6c, 7c end between main leg 6a, the 7a, is disposed with the distance at the interval that forms specified gap.Saturated leg 6c, 7c be with respect to main leg 6a, 7a and saturated leg 6c, 7c, is its area of section and reduces shape, so that be saturable with the magnetic line of force seldom.Corresponding with it, excitatory pin 6b, 7b then are the area of section and increase shape, even very macro-energy can be unsaturated yet so that stored.The 1st the 6 and the 2nd iron core 7 unshakable in one's determination also can use the EI iron core to wait the iron core of other shape.
Supporter 5 is identical with bobbin 10, and available synthetic resin and so on monolithic molding is the square frame shape of central zone cavity 16.Supporter 5 forms concave panel 17 on the part of surperficial 5c, be coupled among the concave panel 17 of supporter 5 by the 13a of the portion that is provided with that makes bobbin 10, can carry out the location when the surperficial 5c that bobbin 10 is carried to supporter 5 gone up.Terminal 15 has the 1st terminal 15a that connects elementary winding 1, and the 2nd terminal 15b that connects secondary winding 2, according to transformer or specification that the substrate of transformer is installed, determines its number and configuration.The 1st terminal 15a is the outwards outstanding shape from 5 one side 5a of supporter, and the 2nd terminal 15b is the shape of outwards giving prominence to towards the direction opposite with the 1st terminal 15a from another side 5b of supporter 5.Among transformer shown in Figure 1, respectively there are eight the 1st terminal 15a and the 2nd terminal 15b to be outwards outstanding shape from side 5a, the 5b of supporter 5.The lead-out wire 1a at elementary winding 1 two ends of arranged spaced connects with different the 1st terminal 15a respectively, and the lead-out wire 2a at the two ends of secondary winding 2 connects with different the 2nd terminal 15b respectively.Each terminal 15 is L-shaped, and is outstanding from side 5a, the 5b of supporter 5 with a side end as shown in Figure 3, and the opposing party's end remains on the supporter 5 with outstanding state from the bottom surface 5d of supporter 5.Lead-out wire 1a, the 2a of elementary winding 1 and secondary winding 2 with outwards is connected a side's of outstanding terminal 15 end from side 5a, the 5b of supporter 5, the opposing party's of the terminal of outwards giving prominence to from the bottom surface 5d of supporter 5 15 end is connected with substrate.In addition, lead-out wire 1a, the 2a of elementary winding 1 and inferior wire-wound group 2 are as Figure 1 and Figure 2, and the bottom surface 5d that passes supporter 5 goes up the slot part 5e that forms and is connected with the 1st terminal 15a and the 2nd terminal 15b respectively.Though not shown, be wound on other secondary winding on the auxiliary bobbin 9, the lead-out wire at its two ends passes after the slot part 5e, respectively with other the 2nd terminal 15b connection that is different from the 2nd terminal 15b that secondary winding 2 is connected.
Among used transformer, hold secondary winding or hold under the situation of elementary winding construction when adopting by the secondary winding pincers by elementary winding pincers, because being wound on the lead-out wire of the winding in the coiling portion of central authorities need be by on any one party in the winding of both sides, thereby be difficult to fully to guarantee space length and leakage distance between elementary winding and the secondary winding.Yet, the transformer of present embodiment, be set at outstanding in the opposite direction respectively formation owing to will connect the 1st terminal 15a of elementary winding 1 with the 2nd terminal 15b that is connected secondary winding 2, thereby can fully guarantee space and leakage distance between elementary winding 1 and the secondary winding 2.In addition, also needn't be as the existing miniaturization that with mode, can realize transformer for the height that obtains space between elementary winding 1 and the secondary winding 2 and leakage distance and increase flange 4.
In addition, among illustrative transformer, disposed the protective cover 8 that surrounds bobbin 10 surfaces and side.Protective cover 8 can be used and bobbin 10 identical materials form, and as shown in Figure 2, has protruding 8a at its back side, and it can insert among the groove 4a that forms on the surface of flange 4 of bobbin 10.Between the groove 4a of the protruding 8a of protective cover 8 and the flange 4 of bobbin 10, separated from one another across the interval of regulation.By the leakage distance that prolongs elementary winding 1 and secondary winding 2 elementary winding 1 and secondary winding 2 are reliably insulated.In addition, elementary winding 1 and secondary winding 2 are more close owing to making, thereby can make transformer miniaturization more.
Though omitted elementary winding 1 and secondary winding 2 among the figure, in assembling during transformer, as shown in Figure 3, at first prepared elementary winding 1 and secondary winding 2 and be wound on bobbin 10 in the 1st coiling portion 11 and the 2nd coiling portion 12 respectively.Then, after protective cover 8 is installed in the top of bobbin 10, surround bobbin 10 with protective cover 8.By being cooperated, protective cover 8 is installed on the flange part 13 of bobbin 10, can protective cover 8 and bobbin 10 is fixing, but also available adhesive securement protective cover 8 and bobbin 10.When being installed to protective cover 8 on the bobbin 10, the protruding 8a on protective cover 8 back sides can be inserted in the groove 4a of flange 4 of bobbin 10.Form the opening 8b consistent on the protective cover 8 with the opening 10a of bobbin 10, behind the main leg 6a of the 1st the 6 and the 2nd iron core 7 unshakable in one's determination, the opening 8b that 7a passes protective cover 8, the inside of inserting bobbin 10 from the opening 10a of bobbin 10.In addition, saturated leg 6c, the 7c of the 1st the 6 and the 2nd iron core 7 unshakable in one's determination insert the inside of auxiliary bobbin 9 from the opening 9a of auxiliary bobbin 9.At this moment the bonding agent of available epoxy and so on is fixed between the end of excitatory pin 6b, the 7b of the 1st the 6 and the 2nd iron core 7 unshakable in one's determination and saturated leg 6c, 7c and between the inner peripheral surface of the outer peripheral face of main leg 6a, 7a and bobbin 10.Main leg 6a, 7a with the end separating state configuration in bobbin 10.
Then, prepare supporter 5, the 13a of the portion that is provided with that forms on the flange part 13 of bobbin 10 is coupled among the last concave panel 17 that forms of surperficial 5c of supporter 5.The surperficial 5c butt of the bottom surface by making protective cover the 8, the 1st the 6 and the 2nd iron core 7 unshakable in one's determination and the flange part 14 of auxiliary bobbin 9 and supporter 5, with each component configuration to supporter 5.Though not shown, the bobbin 10 and the supporter 5 of protective cover 8 have been installed can have been fixed by coiling insulating tape on side face.After bobbin 10 and supporter 5 is fixing, the elementary winding 1 of bobbin 10 and lead-out wire 1a, the 2a of secondary winding 2 are connected on the 1st terminal 15a and the 2nd terminal 15b of supporter 5 with scolding tin.Yet also can be before fixedly bobbin 10 and supporter 5, lead-out wire 1a, the 2a of elementary winding 1 and secondary winding 2 is connected on the 1st terminal 15a and the 2nd terminal 15b.In addition, other secondary winding that is wound on the auxiliary bobbin 9 is identical with the secondary winding 2 of bobbin 10, and available scolding tin is connected to lead-out wire on the 2nd terminal 15b.Can form transformer by above-mentioned operation, but also can there be other various methodologies in the manufacturing process of transformer, above-mentioned operation is an example wherein only.Especially between the 1st the 6 and the 2nd iron core 7 unshakable in one's determination, and the 1st the unshakable in one's determination the 6 and the 2nd unshakable in one's determination 7 and bobbin 10 between owing to form the thermal expansion ratio difference of the material of each parts, on each parts crackle takes place sometimes.Therefore, the adhering method of each parts preferably suitably changes according to the specification of transformer.
Transformer is connected with not shown substrate at a plurality of terminals 15, and during the switch connection of supply unit, electric current promptly flows in elementary winding 1 and secondary winding 2.Main leg 6a, 7a, excitatory pin 6b, 7b and saturated leg 6c, 7c are excitatory by elementary winding 1 and secondary winding 2, and energy is stored among the 1st the 6 and the 2nd iron core 7 unshakable in one's determination.The magnetic line of force of main leg 6a, the last generation of 7a is by excitatory pin 6b, 7b and saturated leg 6c, 7c.Switch one disconnects, and energy stored promptly is released in the 1st the 6 and the 2nd iron core 7 unshakable in one's determination, produces output voltage on transformer.Be wound on other secondary winding on the auxiliary bobbin 9 when transformer action, produce output voltage with the secondary winding 2 of bobbin 10.
By changing the distance between the 1st the 6 and the 2nd iron core 7 unshakable in one's determination, can adjust or control the inductance value of elementary winding 1 and secondary winding 2.Transformer is according to the magnetic flux density of the 1st the 6 and the 2nd iron core 7 unshakable in one's determination, determine the area of section of the 1st the 6 and the 2nd iron core 7 unshakable in one's determination and the number of turns of elementary winding 1, spacing between the main leg 6a that can be by adjusting the 1st iron core 6 and the main leg 7a of the 2nd iron core 7 is adjusted inductance.Corresponding with it, the number of turns of secondary coil 2 can be selected the regulation number of turns by the input voltage of transformer and output voltage decision.The coiling direction of elementary winding 1 and secondary winding 2 can suitably determine according to the specification of transformer.
The value of leakage inductance depends on distance and the relative area between width, elementary winding 1 and the secondary winding 2 of the primary coil 1 of coiling and secondary coil 2, but among the present invention, the ratio of the elementary winding 1 by changing configured separate and the number of turns of secondary winding 2, the relative area between elementary winding 1 and the secondary winding 2 can be changed, the leakage inductance value of elementary winding 1 and secondary winding 2 can be adjusted or control.Owing to do not change the width of elementary winding 1 and secondary winding 2 and the distance between elementary winding 1 and the secondary winding 2, therefore needn't change the interval of flange 4 or flange part 13, promptly available same bobbin 10 forms the transformer with different leakage inductance values.That is to say that the present invention need not can form multiple transformer by changing the shape that mould changes bobbin 10.The relative area of the value of leakage inductance between elementary winding 1 and secondary winding 2, minimum when promptly the thickness of elementary winding 1 of Juan Raoing and secondary winding 2 equates.For example, if the number of turns of elementary winding 1 is set at 50 circles, wants leakage inductance value with elementary winding 1 and secondary winding 2 and be set at hour, the elementary winding 1 of 50 circles of can reeling respectively in the 1st coiling portion 11 of configured separate is connected in parallel after making the phase place unanimity.In addition, another kind of method is to be connected in series after the elementary winding 1 of 25 circles of reeling respectively in the 1st coiling portion 11 of configured separate makes the phase place unanimity.
Secondly, when wanting to make the leakage inductance value increase of elementary winding 1 and secondary winding 2, two of configured separate can be changed into the different number of turns by elementary winding 1.Particularly, can be set at 20 circles and 30 by the number of turns and enclose, be connected in series after making the phase place unanimity two elementary windings 1.When wanting to make the leakage inductance value of elementary winding 1 and secondary winding 2 further to increase, can be set at 10 circles and 40 by the number of turns and enclose, be connected in series after making the phase place unanimity two elementary windings 1.When wanting to make the leakage inductance value of elementary winding 1 and secondary winding 2 to be increased to maximum, enclose and to accomplish as long as the number of turns of two elementary windings 1 is set at 0 circle and 50.
Fig. 4 (a) and (b) have been to use the sketch of transformer of the present embodiment of the bobbin 10 with three coiling portions of cutting apart 11,12, and the curve chart of representing elementary winding 1 and the variation of the leakage inductance value of secondary winding 2.Relation between the leakage inductance value of the number of turns percentage of two elementary windings 1 that are connected in series after the graphical representation of Fig. 4 (b) is cut apart and elementary winding 1 and secondary winding 2 (μ H).Indicate elementary winding 1 with P among the figure, indicate secondary winding 2, indicate auxiliary winding 18 described later with A with S.Whole number of turns of elementary winding 1 as 100%, are changed the 1st elementary winding P1 of the elementary winding 1 after cutting apart and the number of turns of the 2nd elementary winding P2.If make the number of turns of the 1st elementary winding P1 be increased to half gradually near whole number of turns of elementary winding 1, then the leakage inductance value descends, if by continuing to increase the number of turns of the 1st elementary winding P1, make it to take a turn for the worse with the number of turns of the 2nd elementary winding P2, then the leakage inductance value rises once more.Be a half of the number of turns of elementary winding 1 when the number of turns of the 1st elementary winding P1 and the 2nd elementary winding P2, the leakage inductance value becomes minimum L1, hence one can see that, and the ratio of the number of turns by changing the 1st elementary winding P1 and the 2nd elementary winding P2 can make the value of leakage inductance become big.As mentioned above, the ratio of the number of turns by changing elementary winding 1 can be adjusted to desirable value with the leakage inductance value of elementary winding 1 and secondary winding 2.
The present invention has been not limited to use has the three above-mentioned transformers of cutting apart the bobbin 10 of coiling portion 11,12, also can use to have more that multireel forms transformer around the bobbin 10 of portion 11,12.Fig. 5～Fig. 8 example illustrates other execution mode of the present invention.
Fig. 5 (a) and (b) have been to use the sketch of the transformer of the bobbin 10 with four coiling portions of cutting apart 11,12, and the curve chart of variation of representing the leakage inductance value of elementary winding 1 and secondary winding 2.Elementary winding 1 is divided into two with secondary winding 2, each other alternate configurations.The relation of the leakage inductance value (μ H) of elementary winding 1 number of turns percentage of the graphical representation of Fig. 5 (b) and elementary winding 1 and secondary winding 2.The number of turns ratio of secondary winding 2 is made as fixing.Identical with transformer shown in Figure 4, if make the number of turns of the 1st elementary winding P1 be increased to half gradually near whole number of turns of elementary winding 1, then the leakage inductance value descends, if by continuing to increase the number of turns of the 1st elementary winding P1, make it to take a turn for the worse with the number of turns of the 2nd elementary winding P2, then the leakage inductance value rises once more.Yet because the 2nd elementary winding P2 and the 1st secondary winding S1 and the 2nd these two disposed adjacent of secondary winding S2, therefore, when the leakage inductance value was slightly more than the number of turns of the 1st elementary winding P1 in the number of turns of the 2nd elementary winding P2, the leakage inductance value became minimum L2.In addition, the secondary winding 2 that constitutes by the 1st secondary winding S1 and the 2nd secondary winding since relative area greater than transformer shown in Figure 4, therefore, the minimum value L2 of leakage inductance value is also littler than the minimum value L1 of the leakage inductance value of transformer shown in Figure 4.
Fig. 6 has represented to use the sketch of the transformer of the bobbin 10 with five coiling portions of cutting apart 11,12.By elementary winding 1 is divided into three, secondary winding 2 is divided into two, each other alternate configurations.Though omitted diagram, but when being made as the number of turns of two secondary winding 2 ratio fixedly, with the 1st elementary winding P1, the 2nd elementary winding P2 of elementary winding 1, when the 3rd elementary winding P3 forms the same number of turns, elementary winding 1 becomes minimum value with the leakage inductance value of secondary winding 2.Yet, under the situation of elementary winding 1 that is connected in series, but because the number of turns ratio of the elementary winding 1 of appropriate change, with the 1st elementary winding P1, when the 3rd elementary winding P3 forms the same number of turns, when the number of turns that the 2nd elementary winding P2 is formed during more than the 1st elementary winding P1 and the 3rd elementary winding P3, elementary winding 1 becomes minimum value with the leakage inductance value of secondary winding 2.In addition, because transformer shown in Figure 6 is compared with transformer shown in Figure 5, relative area further increases, so the minimum value of the leakage inductance of transformer is also littler than the minimum value of the leakage inductance of transformer shown in Figure 5.
Fig. 7 and Fig. 8 are illustrated in the transformer of the auxiliary winding 18 of having reeled on the bobbin 10.Transformer shown in Figure 7 has appended auxiliary winding 18 between the 2nd elementary winding P2 of secondary winding 2 and elementary winding 1.Among this transformer, when comparing with the number of turns of the 2nd elementary winding P2, because the number of turns of the 1st elementary winding P1 of secondary winding 2 close configurations for a long time, the leakage inductance value becomes minimum value.Transformer shown in Figure 8 appends auxiliary winding 18 adjacent with the 2nd elementary winding P2 of elementary winding 1 with secondary winding 2 opposite sides.Among this transformer,,, thereby have the characteristic identical with transformer shown in Figure 4 because the 1st elementary winding P1 and the distance between the 2nd elementary winding P2 and the secondary winding 2 of elementary winding 1 are identical with transformer shown in Figure 4 even append auxiliary winding 18.
In addition, the present invention also can carry out all changes.For example among above-mentioned transformer, it is the output voltage of the transformer situation when being lower than input voltage, but the output voltage at transformer is higher than under the situation of input voltage, also can put upside down, with the two ends of secondary winding 2 configured separate to elementary winding 1 by the winding position that makes elementary winding 1 and secondary winding 2.In these cases, especially at the output voltage height of transformer, and under the many situation of the number of turns of secondary winding 2, can adjust the leakage inductance value of elementary winding 1 and secondary winding 2 well.
If adopt power transformation device of the present invention, owing to, can adjust the leakage inductance value, thereby can be easy to change the value of leakage inductance according to the purposes of transformer by the elementary winding 1 of change configured separate or the number of turns ratio of secondary winding 2.Just because of this, needn't change the shape of bobbin 10 and flange 4 as before, just can obtain best leakage inductance value, can produce low cost, high performance transformer.
The present invention can be applicable to well voltage resonance formula Switching Power Supply, current resonance formula Switching Power Supply or with the resonance type switching powers such as particular resonance formula Switching Power Supply of a part of resonance of switch motion waveform in the transformer that uses.

Claims (5)

1, a kind of transformer is characterized in that, comprising: elementary winding and secondary winding; And bobbin, it has reel the 1st coiling portion of above-mentioned elementary winding and the 2nd coiling portion of the above-mentioned secondary winding of reeling,
Above-mentioned the 1st coiling portion and the 2nd coiling portion the two or wherein any one party configured separate on the axis direction of bobbin is a plurality of,
By the aforementioned elementary winding of change configured separate or the number of turns ratio of secondary winding, adjust the leakage inductance value of elementary winding and secondary winding.
2, transformer according to claim 1 is characterized in that: aforementioned the 1st coiling portion and the 2nd coiling portion form the tubular with pair of openings; Disposed the 1st unshakable in one's determination and the 2nd iron core, it inserts aforementioned pair of openings, and forms magnetic circuit when electric current is flowed through aforementioned elementary winding and secondary winding; By changing the distance between aforementioned the 1st iron core and aforementioned the 2nd iron core, adjust the inductance value of aforementioned elementary winding and aforementioned secondary winding.
3, transformer according to claim 1 and 2 is characterized in that: the side's that aforementioned the 1st coiling portion and the 2nd coiling portion number of turns is many winding separates and is configured to the two ends of the few the opposing party's winding of the number of turns;
By the aforementioned elementary winding of change configured separate or the number of turns ratio of secondary winding, adjust the leakage inductance of aforementioned elementary winding and aforementioned secondary winding.
4, transformer according to claim 1 and 2 is characterized in that: comprise supporter, it has a plurality of terminals that are connected with substrate,
Before or after fixing aforementioned bobbin and the aforementioned supporter, aforementioned elementary winding and secondary winding are connected with the terminal of aforementioned supporter.
5, transformer according to claim 4 is characterized in that: aforementioned terminal comprises the 1st terminal that connects aforementioned elementary winding and the 2nd terminal that connects aforementioned secondary winding,
Aforementioned the 1st terminal forms from a side of aforementioned supporter outwards outstanding,
Aforementioned the 2nd terminal forms from the another side court of aforementioned supporter outstanding with aforementioned the 1st terminal rightabout.
CNB2006100678458A 2005-03-31 2006-03-14 Transformer Expired - Fee Related CN100495599C (en)

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WO2008074767A2 (en) 2006-12-20 2008-06-26 Primozone Production Ab Power supply apparatus for a capacitive load
KR100798448B1 (en) * 2007-03-16 2008-01-28 주식회사 코일마스터 Inductor to improve current characteristics
CN101950656B (en) * 2010-08-24 2012-01-04 合肥华耀电子工业有限公司 Method for winding coils of high-frequency resonance transformer
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