CN100341081C - Multiple choke coil and electronic equipment using the same - Google Patents

Abstract

The invention is comprised of a coil group arranging a plurality of terminal-integrated type coils ( 1 ), ( 4 ) formed by bending a metal sheet in a preset development form and having a predetermined positional relationship, and a magnetic material ( 7 ) burying therein the coil group. For example, axes of the plurality of coils ( 1 ), ( 4 ) constituting the coil group, are arranged in parallel wherein the center point of at least one coil selected from the plurality of coils ( 1 ), ( 4 ) and the center point of a coil other than the selected coil are in an staggered arrangement. Due to this, an array type choke coil can be realized which is thin overall and operable with a large current in a high frequency band.

Description

Multi-joint choke and use the electronic equipment of multi-joint choke

Technical field

The present invention relates to the employed multi-joint choke of various electronic equipments and use electronic equipment, the especially power-supply device of multi-joint choke.

Background technology

For inductors such as chokes,, wish its realization miniaturization, slimming for miniaturization, lightweight with electronic equipment adapt.In addition, with respect to high speed, the high integration of LSI such as CPU, wish that inductor can be at high band to count the big electric current use of A to tens of A.

Therefore, hope can provide the inductor with following performance at an easy rate: have little volume and have little resistance for suppressing heating, and little in the loss of high band, even and also little because of the reduction of the DC stacked inductance value that causes under the situation of big electric current.

Recently, in transducers such as DC/DC, can adopt the circuit mode that is referred to as heterogeneous mode at the power circuit of high band by big electric current as being used for.The sort circuit mode is when a plurality of DC/DC transducers are carried out phase control, also uses switch to make its mode of concurrent working successively.The feature of this mode be can be with high efficient at high band by big electric current and realize the reduction of pulsating current.

But adopting the foregoing circuit structure may not be enough to high band by big electric current, even also require it to realize miniaturization, also can pass through big electric current at high band for the used choke of such power circuit equipment.

For such problem, for example disclosed choke has following structure in TOHKEMY 2002-246242 communique: will have the coil of wire coiled coiled type of insulating coatings such as polyurethanes and the air core coil that forms is embedded in the magnetic.Be to use as this magnetic and coated with 2 kinds or above resin material that surperficial magnetic material powder forms through curing.In addition, the metal terminal that forms through bending process is housed on magnetic, air core coil and metal terminal is electrically connected by welding, solder or conductive adhesive etc.

Yet, in the structure of the choke of above-mentioned prior art,, be difficult to do dc resistance very little owing to must carry out follow-up connection processing to metal terminal; In addition, increase, also be difficult to miniaturization if the space then is set according to a plurality of side by side above-mentioned coils of heterogeneous number.Moreover, under the situation of heterogeneous use, also exist because the uneven problem that can not give full play to its feature of the inductance value between a plurality of coils.

In addition, will have the coil of wire coiled coiled type of insulating coating such as polyurethanes and the air core coil that forms when being used for heterogeneous mode,, vertically be configured to row, then can not realize slimming because of whole height increases if for example with a plurality of air core coils.Have again, use such air core coil, just must increase the number of turns, the problem that also exists choke itself to increase for increasing inductance value.

Summary of the invention

Purpose of the present invention just is to address these problems, and a kind of multi-joint choke is provided, and its dc superposition characteristic is good, can be when high band can be guaranteed inductance value with big current work, and can realize miniaturization.

Multi-joint choke of the present invention comprises position relation with setting and the coil groups of a plurality of terminals one body coil of configuration and above-mentioned coil groups is embedded in the magnetic of magnetic inside; The metal plate that above-mentioned terminal one body coil is made of predefined expansion shape is through being bent to form.Adopt this structure, because the coil portion of a plurality of terminal one body coils is embedded in the magnetic with insulating properties, thereby good in the characteristic of high band, the error of inductance value is also little, and, multi-joint choke short circuit, highly productive can seldom be appearred.

In addition, multi-joint choke of the present invention can be made, in said structure, being configured to of above-mentioned coil groups: the central shaft of a plurality of coils that constitute coil groups is parallel to each other thereby coil is arranged side by side, simultaneously, the central point of at least one coil of selecting from a plurality of coils is different with the height of the central point of selected coil coil in addition.Like this, can make volume little, can realize high coupling and can be applicable to the multi-joint choke of big electric current.

And then, its structure can be made, in said structure, the inductance value that the distance between the central point of at least one coil of selecting central point by changing at least one coil select from coil groups and a plurality of coils beyond this selected coil obtains stipulating.And, the inductance value that the height and position between the central point of at least one coil of selecting central point by changing at least one coil select from coil groups and a plurality of coils beyond this selected coil obtains stipulating.Owing to adopt this structure,, can obtain at an easy rate also that the different volume of inductance value is little, the multi-joint choke of highly low structure even the number of turns of coil is identical.

Have again, its structure can be made, in said structure, at least one coil that to select from coil groups becomes V font or inverted v-shaped with two coil configuration adjacent with this selected coil, thereby to flow through the interior flow direction of coil that passes that is produced when being configured in two coils adjacent with this selected coil be mutual different direction to flow direction and the electric current in the coil of passing that is produced when making electric current flow through above-mentioned selected coil.Owing to adopt this structure, when also can make inductance value bigger, make small-sized multi-joint choke.

In addition, its structure can be made, in said structure, at least one coil that to select from coil groups becomes V font or inverted v-shaped with two coil configuration adjacent with this selected coil, is identical direction thereby the flow direction that is produced when making electric current flow through above-mentioned selected coil and electric current flow through the flow direction that is produced when being configured in two coils adjacent with this selected coil.Owing to adopt this structure, can make that DC stacked feature is good, volume is little, the multi-joint choke of highly low structure.

In addition, its structure can be made, in said structure, the number of turns that constitutes the coil of coil groups is enclosed (wherein by (N+0.5), N be 1 or above integer) constitute, its structure forms for the N circle part of the coil selected from above-mentioned coil groups with (N+0.5) circle part stacked arrangement of the adjacent coil of this selected coil.Owing to adopt this structure, can make also that volume is little, the multi-joint choke of highly low structure.

And then its structure can be made, in said structure, and the inductance value that each distance between the central point of central point by changing selected coil and the coil that is configured in two coils adjacent with this selected coil obtains stipulating.Owing to adopt this structure,, also can make the different small-sized multi-joint choke of inductance value even the number of turns of coil is identical.

In addition, the structure of multi-joint choke of the present invention can be made, and in said structure, the central point of a plurality of coils of the feasible formation of the configuration of coil coil groups is in the same plane.Like this, can make little, the highly low structure of the error of the inductance value between a plurality of coils, applicable to the multi-joint choke of big electric current and high band.

Have again, can make, in said structure, the inductance value that obtains stipulating by the distance between the central point that changes 2 adjacent in a plurality of above-mentioned coils coils.Like this, even use the identical coil of the number of turns, also can make the different multi-joint choke of inductance value at an easy rate.

In addition, can make, in said structure, the configuration of coil groups makes that the direction of the magnetic flux in the coil that electric current produced when flowing through each of a plurality of coils is different mutually.Like this, each magnetic flux mutual superposition can make the big multi-joint choke of inductance value.

And, can make, in said structure, the configuration of coil groups makes that the direction of the magnetic flux in the coil that electric current produced when flowing through each of a plurality of coils is an equidirectional.Like this, because it is saturated to suppress magnetic flux, thereby can make the good multi-joint choke of dc superposition characteristic.

In addition, the structure of multi-joint choke of the present invention can be made, in said structure, being configured to of above-mentioned coil groups: the feasible central shaft that constitutes a plurality of coils of coil groups is parallel to each other thereby coil is arranged side by side, simultaneously, make at least one coil of from a plurality of coils, selecting central point and and the central point of the adjacent coil of selected coil between distance be the external diameter of selected coil and adjacent coil the external diameter sum 1/2 or below, at least 1 circle and adjacent coil interlock of selected coil.Owing to adopt this structure, can make volume little, can realize high coupling and can be applicable to the multi-joint choke of big electric current.

And then, can make, in said structure, the number of turns of selected coil and adjacent coil by the N circle (wherein, N be 2 or above integer) constitute, its configuration makes (N-1) circle and adjacent coil interlock of selected coil.Like this, can make volume little, can realize high coupling and can be applicable to the multi-joint choke of big electric current.

Have again, can make, in said structure, the configuration of coil groups makes that the difference of the external diameter of difference and adjacent coil of the external diameter of selected coil and internal diameter and internal diameter is identical, the internal diameter sum of the distance between the central point of the central point of selected coil and adjacent coil and the external diameter of selected coil and adjacent coil 1/2 consistent.Like this, can make volume littler, can realize high coupling and can be applicable to the multi-joint choke of big electric current.

In addition, can make, in said structure, the central point by changing selected at least one coil in coil groups and and the central point of the adjacent coil of selected coil between the distance inductance value that obtains stipulating.Like this, even the number of turns of coil is identical, owing to also can obtain different inductance value, thereby can more freely set the inductance value of regulation.

And, can make, in said structure, the configuration of coil groups makes that the direction of the magnetic flux the when direction of the magnetic flux in coil when electric current flows through in coil groups selected at least one coil and electric current flow through coil with selected coil institute adjacency is equidirectional.Like this, can make that dc superposition characteristic is good, volume is little, highly low structure.

In addition, can make, in said structure, the configuration of coil groups makes that the direction of the magnetic flux the when direction of the magnetic flux in coil when electric current flows through in coil groups selected at least one coil and electric current flow through coil with selected coil institute adjacency is a different directions.Like this, can when keeping small-sized shape, make inductance value bigger.

And then, can make, in said structure, a plurality of coils of coil groups all dispose point-blank.So, can control inductance value accurately.

In addition, in the above-mentioned multi-joint choke, can make, at least one coil configuration of selecting from a plurality of coils is on the position of staggering with point-blank a plurality of other coils of configuration.Like this, owing to can in magnetic, fill a plurality of coils of configuration expeditiously, thereby can further make the global shape miniaturization of multi-joint choke.

In addition, in the above-mentioned multi-joint choke, can make, the configuration of coil groups makes selected 2 or above input terminal expose on identical surface with at least one side in the lead-out terminal.Like this, become easily, can easily carry out the installation of multi-joint choke and and confirm operation with the circuit arrangement of semiconductor integrated circuit etc.

In addition, the structure of multi-joint choke of the present invention is that in the above-mentioned coil groups, a plurality of above-mentioned coil that constitutes coil groups vertically is embedded in the inside of magnetic.Adopt this structure, can make its working frequency range is high band, and, inductance value and dc resistance can be reduced, thereby the multi-joint choke that can be applicable to big electric current, can realize miniaturization can be made.

And then, can make, in said structure, the inductance value that obtains stipulating by the interval that changes between a plurality of coils.Like this,, also inductance value can be changed, thereby the inductance value of satisfying the demand can be easily realized even the number of turns is identical.

Have, can make, in said structure, the configuration of coil groups makes that the direction of the magnetic flux in the coil that electric current produced when flowing through a plurality of coil is equidirectional.Like this, can reduce pulsating current.

In addition, can make, in said structure, the configuration of coil groups makes that the direction of the magnetic flux in the coil that electric current produced when flowing through a plurality of coil is mutual different directions.Like this, can improve dc superposition characteristic.

In addition, can make, in said structure, the number of turns of a plurality of coils by (N+0.5) circle (wherein, N be 1 or above integer) constitute, its structure is that the 0.5 circle part that is positioned at each coil up and down is configured in the same plane.Like this, can reduce whole height.

Also have, can make, in said structure, all input terminals of a plurality of coils and at least one side of lead-out terminal are exposed on identical plane.Like this, can improve installation capability.

In addition, in above-mentioned multi-joint choke, can make, magnetic is by ferrite magnetic body, at least a formation of selecting in the complex of the complex of ferrimagnetism powder and insulative resin and metal magnetic powder and insulative resin.Like this, because coil groups is embedded in the inside of the magnetic with insulating properties, thereby can reduce the generation of short circuit etc., and can make the multi-joint choke that is applicable to high band.

In addition, the structure of above-mentioned multi-joint choke can be made, and forms dielectric film on the surface of coil.Like this,, short circuit etc. can be do not occurred between metal plate yet, also filling rate can be increased even will constitute the metal plate bending of coil and make its driving fit.

Moreover the structure of above-mentioned multi-joint choke can be made, and coil groups has 2 terminals at least from showing out of having nothing in common with each other.Like this, owing to can widen the width of terminal, thereby can improve heat dispersion.Have again, owing to can increase the bonding strength of terminal part, thereby also can improve reliability.

In addition, the structure of above-mentioned multi-joint choke can be made, and at least one terminal of coil groups is through the bottom surface and at least 2 faces of face on every side and exposing.Like this, can improve packing density and reliability.

In addition, in above-mentioned multi-joint choke, can make, in the above-mentioned coil groups, expose at least and have by nickel (Ni) in the terminal part on surface or comprise the substrate layer that the layer of nickel (Ni) constitutes, its superiors form solder layer or tin (Sn) layer.Like this, can make solder firmly and improve its reliability.

Have again, in above-mentioned multi-joint choke, can make, at least one side's of expression input terminal and lead-out terminal labeling section is set on the magnetic.Like this, can easily carry out the inspection of installation exercise and installation front and back.

In addition, in above-mentioned multi-joint choke, can make, magnetic forms rectangular shape.Like this, can easily install automatically.

In addition, by above-mentioned multi-joint choke is loaded in the power-supply device, it is little and can realize small-sized, the slimming of various electronic equipments with the power-supply device of big current work to make volume.

Description of drawings

Fig. 1 is the perspective elevation of the multi-joint choke of the embodiment of the invention 1.

Fig. 2 is the wiring diagram of the multi-joint choke of embodiment 1.

Fig. 3 is the plane graph of the punching press writing board shape before the used one-piece type coil of terminal of the multi-joint choke of expression formation embodiment 1.

Fig. 4 is the stereogram of the used one-piece type coil of terminal of the multi-joint choke of embodiment 1.

Fig. 5 is the profile along the A1-A1 line shown in Figure 1 of the multi-joint choke of embodiment 1.

Fig. 6 is to use the circuit diagram of power circuit of heterogeneous mode of the multi-joint choke of embodiment 1.

Fig. 7 is the perspective elevation of the multi-joint choke of embodiments of the invention 2.

Fig. 8 is the wiring diagram of the multi-joint choke of embodiment 2.

Fig. 9 is the profile along the B1-B1 line shown in Figure 7 of the multi-joint choke of embodiment 2.

Figure 10 is the profile along the B1-B1 line shown in Figure 7 of the multi-joint choke of embodiment 2.

Figure 11 is illustrated in the multi-joint choke of embodiment 2, is used to ask the basic block diagram of the relation of distance between the central point of coil or height and position and inductance value, is the stereogram of the coiler part of the one-piece type coil of terminal and magnetic area part on every side.

Figure 12 A is illustrated in the multi-joint choke of embodiment 2, is used to ask the perspective elevation of arrangement of multi-joint choke of the relation separately of distance between the central point of coil or height and position and inductance value.

Figure 12 B is illustrated in the multi-joint choke of embodiment 2, is used to ask the profile of arrangement of multi-joint choke of the relation separately of distance between the central point of coil or height and position and inductance value.

Figure 13 A is illustrated in the multi-joint choke of embodiment 2 graph of a relation of distance and inductance value between the central point of coil.

Figure 13 B is illustrated in the multi-joint choke of embodiment 2 the height place value between the central point of coil and the graph of a relation of inductance value.

Figure 14 is the distortion illustration of multi-joint choke of expression embodiment 2, is the structural perspective that is illustrated in and disposes the other one-piece type coil of terminal of configuration on the position that the one-piece type coil of a plurality of terminals point-blank staggers.

Figure 15 is the perspective elevation of the multi-joint choke of the embodiment of the invention 3.

Figure 16 is the profile along the B2-B2 line shown in Figure 15 of the multi-joint choke of embodiment 3.

Figure 17 A is the perspective elevation of positive coupling structure occasion of the multi-joint choke of embodiments of the invention 4.

Figure 17 B is the wiring diagram of multi-joint choke of the positive coupling structure of embodiment 4.

Figure 18 is the profile along the A2-A2 line shown in Figure 17 A of the multi-joint choke of embodiment 4.

Figure 19 A is the profile along the B3-B3 line shown in Figure 17 A of the multi-joint choke of embodiment 4.

Figure 19 B is the profile along the B3-B3 line shown in Figure 17 A of the multi-joint choke of embodiment 4.

Figure 20 A is the perspective elevation of negative coupling structure occasion of the multi-joint choke of embodiment 4.

Figure 20 B is the wiring diagram of multi-joint choke of the negative coupling structure of embodiment 4.

Figure 21 A is in the multi-joint choke of embodiment 4, has the profile of the multi-joint choke of the identical structure of the direction of the magnetic flux that passes 2 coils.

Figure 21 B is in the multi-joint choke of embodiment 4, has the profile of the multi-joint choke of the identical structure of the direction of the magnetic flux that passes 2 coils.

Figure 22 A is illustrated in the multi-joint choke of embodiment 4, is used to try to achieve the basic block diagram of the relation of distance and inductance value between the central point of coil, is the stereogram of the coiler part of the one-piece type coil of terminal and magnetic area part on every side.

Figure 22 B is illustrated in the multi-joint choke of embodiment 4, is used to try to achieve the perspective elevation of the arrangement of the multi-joint choke of the relation of distance and inductance value between the central point of coil.

Figure 22 C is illustrated in the multi-joint choke of embodiment 4, is used to try to achieve the vertical view of the arrangement of the multi-joint choke of the relation of distance and inductance value between the central point of coil.

Figure 22 D is illustrated in the multi-joint choke of embodiment 4 graph of a relation of distance and inductance value between the central point of coil.

Figure 23 A is the variation of the multi-joint choke of embodiment 4, is the perspective elevation of 3 chokes being made positive coupling structure occasion.

Figure 23 B is the wiring diagram of 3 chokes of positive coupling structure of the variation of Figure 23 A.

Figure 23 C is another variation of the multi-joint choke of embodiment 4, is the perspective elevation of 3 chokes being made negative coupling structure occasion.

Figure 23 D is the wiring diagram of 3 chokes of negative coupling structure of the variation of Figure 23 C.

Figure 24 A is a variation again of the multi-joint choke of embodiment 4, is the perspective elevation of the one-piece type coil of terminal being arranged at grade and made the multi-joint choke of negative coupling structure by the V font.

Figure 24 B is the end view of the multi-joint choke of a variation again of Figure 24 A.

Figure 24 C is the wiring diagram of the multi-joint choke of a variation again of Figure 24 A.

Figure 25 is the another variation of the multi-joint choke of embodiment 4, is the profile of the central point of the one-piece type coil of terminal being arranged multi-joint choke point-blank.

Figure 26 is the perspective elevation of the multi-joint choke of embodiments of the invention 5.

Figure 27 is in the multi-joint choke of expression embodiment 5, is used to make the vertical view of shape of the punching press flat board of the one-piece type coil of terminal.

Figure 28 is in the multi-joint choke of expression embodiment 5, makes the stereogram of the shape of the one-piece type coil of terminal by bending.

Figure 29 is the profile along the A3-A3 line shown in Figure 26 of the multi-joint choke of embodiment 5.

Figure 30 is the profile along the B4-B4 line shown in Figure 26 of the multi-joint choke of embodiment 5, is the figure of the positive coupling structure occasion of expression.

Figure 31 is the profile along the B4-B4 line shown in Figure 26 of the multi-joint choke of embodiment 5, is the figure of the negative coupling structure occasion of expression.

Figure 32 A is the multi-joint choke that is used for illustrating at embodiment 5, and the distance and the graph of a relation of coupling between the central point of coil are the profiles of multi-joint choke that makes the structure of central point distance R=6mm.

Figure 32 B is in the multi-joint choke of embodiment 5, makes the profile of multi-joint choke of the structure of central point distance R=7mm.

Figure 32 C is in the multi-joint choke of embodiment 5, makes the profile of multi-joint choke of the structure of central point distance R=8mm.

Figure 32 D is in the multi-joint choke of embodiment 5, makes the profile of multi-joint choke of the structure of central point distance R=0mm.

Figure 33 A is the profile of structure of coil portion of the multi-joint choke of expression embodiments of the invention 6.

Figure 33 B is in the multi-joint choke of embodiment 6, represents the profile of the structure of coil portion equally.

Figure 34 is illustrated in the multi-joint choke of embodiment 6, between the central point of coil portion apart from the graph of a relation of S and inductance value.

Figure 35 is the profile of multi-joint choke of variation of the multi-joint choke of embodiment 6.

Figure 36 A is the perspective elevation of multi-joint choke of another variation of the multi-joint choke of embodiment 6.

Figure 36 B is the stereogram of the used one-piece type coil of terminal of the multi-joint choke of above-mentioned another variation.

Figure 36 C is the stereogram of the used one-piece type coil of terminal of the multi-joint choke of above-mentioned another variation.

Figure 36 D is the wiring diagram of the multi-joint choke of above-mentioned another variation.

Figure 37 A is the perspective elevation of the multi-joint choke of a variation again of the multi-joint choke of embodiment 6.

Figure 37 B is the stereogram of the used one-piece type coil of terminal of the multi-joint choke of an above-mentioned variation again.

Figure 37 C is the stereogram of the used one-piece type coil of terminal of the multi-joint choke of an above-mentioned variation again.

Figure 37 D is the above-mentioned wiring diagram of the multi-joint choke of a variation again.

Figure 38 A is the perspective elevation of multi-joint choke of another variation of the multi-joint choke of embodiment 6.

Figure 38 B is the stereogram of the used one-piece type coil of terminal of the multi-joint choke of above-mentioned another distortion.

Figure 38 C is the stereogram of the used one-piece type coil of terminal of the multi-joint choke of above-mentioned another distortion.

Figure 38 D is the wiring diagram of the multi-joint choke of above-mentioned another distortion.

Figure 39 is the stereoscopic figure of the multi-joint choke of embodiments of the invention 7.

Figure 40 is the stereoscopic figure of another structure of the multi-joint choke of expression embodiments of the invention 7.

Figure 41 is the stereoscopic figure of another structure of the multi-joint choke of expression embodiments of the invention 7.

Symbol description

1,71,131,601 first coils

2,72,602 first input end

3,73,603 first lead-out terminals

4,74,132,604 second coils

5,75,605 second input terminals

6,76,606 second lead-out terminals

7,607,713,723,730,740,750 magnetics

31,631 circular-arc parts

32,134,135,136,635 ends

33,633 connecting portions

34,634,715,716 coil portions

50，505，506，507，508，509，510，711，712，721，722，731，732，

741,742,751,752 coils

51,632 dielectric films

52 substrate layers

53 the superiors

61 input electric power

63 chokes

64 capacitors

65 loads

77,133 tertiary coils

78 the 3rd input terminals

79 the 3rd lead-out terminals

121 mark parts

501 right coils (the one-piece type coil of terminal)

502,504 central coil (the one-piece type coil of terminal)

503 left coils (the one-piece type coil of terminal)

641,642,643,644,649,650,651,652 central points

645,646,647,648 outer peripheral portions

20,151,161,171,733,735,743,745,753,755,5052,5062,5072 input terminals

30,162,172,734,736,744,746,754,756,5053,5063,5073 lead-out terminals

Embodiment

Below, with reference to accompanying drawing embodiments of the invention are elaborated.In the accompanying drawing below, owing to being put on identical label, identical structure division omits its explanation sometimes.

Embodiment 1

Fig. 1 is the perspective elevation of the multi-joint choke of embodiments of the invention 1.And Fig. 2 is the wiring diagram of this multi-joint choke.First coil 1 is made of integrally formed first input end 2 and first lead-out terminal 3.Second coil 4 equally also is made of the second integrally formed input terminal 5 and second lead-out terminal 6.First coil 1 and second coil 4 are wound into equidirectional, and their number of turns all is 1.5 circles.Like this, when second input terminal 5 from the first input end of first coil 12 and second coil 4 flows through under the situation of electric current, the flow direction in the coil of first coil 1 and second coil 4 is same direction.

In addition, the central axes of the central shaft of first coil 1 and second coil 4, and its configuration makes first coil 1 be positioned at the upper strata, second coil 4 is positioned at lower floor.In addition, central shaft separately is meant the axis by the annulus center.In addition, because first coil 1 is identical with the number of turns of second coil 4, thereby the height and position of its central point is also different.

Have, first coil 1 and second coil 4 are embedded in the inside of magnetic 7 again, the rectangular shape that whole magnetic 7 is formed roughly.Therefore, the multi-joint choke of present embodiment is because it whole is rectangular shape roughly, thus when installing automatically easy operating, clamp mistake etc. when being difficult to produce installation.

In addition, Fig. 3 and Fig. 4 are used to illustrate the manufacture method of first coil 1 and second coil 4 and the key diagram of structure, Fig. 3 is the plane graph of the shape of expression punching press flat board, and Fig. 4 is that expression is with its folding one-piece type coil of terminal, i.e. stereogram of the state of first coil 1 and second coil 4 made.

Below, use Fig. 3 and Fig. 4 that the concrete structure of first coil 1 and second coil 4 is described.At first, manufacture method and the structure thereof to the one-piece type coil of terminal of first coil 1 and second coil 4 describes.Fig. 3 is that the one-piece type coil of the terminal plane graph of the shape of punching press flat board is before made in expression.3 circular-arc parts 31 of the ring-type that the punching press flat board is formed by metal plate utilization corrosion or punching press, connect the coupling part 33 between these circular-arc parts 31 and constitute from 2 ends 32 that 2 circular-arc parts prolong.In addition, as metal plate, mainly use copper or silver-colored constant resistance is low, pyroconductivity is big material.In addition, the formation method of punching press flat board is not limited to corrosion or punch process, also can utilize methods such as cutting off processing or compression moulding processing to form.

In addition, form dielectric film 51 on the surface of 3 circular-arc parts 31.Insulative resin such as polyimides can form at an easy rate as long as this dielectric film 51 for example is coated with.Like this, when above-mentioned circular-arc part 31 being folded and make it overlap to form coiler part 34 up and down, can prevent the short circuit between coil.In addition, owing on coupling part 33, do not establish dielectric film 51, thereby even bending coupling part 33, dielectric film 51 can not break or peel off yet, and can prevent to come from the deterioration in characteristics that such dielectric film 51 causes.

3 circular-arc parts 31 of this punching press flat board as shown in Figure 4, overlap central point and are become coil portion 34 by coupling part 33 bendings.In addition, circular-arc part 31 is arranged to the radial one-piece type coil of terminal that forms by the center of bending, 2 end 32 relative coil portions 34.

Like this, the loop construction of first coil 1 and second coil 4 just can be realized utilizing dielectric film 51 to carry out insulation processing in coil portion 34.Therefore, can between coil separately, reach 31 of circular-arc parts and realize gapless laminations.As a result, can make the big multi-joint choke of occupation efficiency.

Secondly, magnetic 7 for example can use, and adds and mixes 3.3 weight portion silicones and granulate into the composite magnetic body of whole grain powder by screen cloth in soft magnetic alloy powder.Such composite magnetic body is made the structure that coats soft magnetic alloy powder with silicones.It is the iron (Fe) of 13 μ m that soft magnetic alloy powder can use the average grain diameter made from for example water atomization: nickel (Ni) is than the soft magnetic alloy powder that is 50: 50.

In addition, though the magnetic 7 of the multi-joint choke of present embodiment uses soft magnetic alloy powder as the metal magnetic powder,, be not limited to this though use silicones to make this complex as insulative resin.For example, can be the complex of ferrimagnetism powder and insulating resin or the metal magnetic powder except that above-mentioned and the complex of insulating resin, and then, can also not complex and ferrite magnetic body just.Though the resistance of this situation ratio increases when using the metal magnetic powder, because the resistance height can prevent the generation of eddy current on the contrary, can obtain good characteristic at high band.

In addition, as the metal magnetic powder, can use it form to amount to and contain 90 weight % or above iron (Fe), nickel (Ni) and cobalt (Co) and the filling rate metal magnetic powder is the metal magnetic powder of 65 volume %-90 volume %.If use such metal magnetic powder, can obtain the magnetic 7 that the high complex of its saturation flux density height and permeability constitutes.In addition, if the average grain diameter of this metal magnetic powder is 1 μ m-100 μ m, also be effective to reducing eddy current loss.

Because the insulating properties of such magnetic 7 is good, thus can prevent between a plurality of coils and coil portion 34 between short circuit etc., can make the multi-joint choke of high reliability.And, by using such magnetic 7, owing to can also suppress because of in multi-joint choke, flowing through the eddy current that electric current produces in magnetic 7, thereby can also make the multi-joint choke that can be used for the high band zone.And then, under situations such as this multi-joint choke formation power circuit equipment of use, can also guarantee insulating properties with other parts.

Fig. 5 represents along the profile of the A1-A1 line of multi-joint choke shown in Figure 1.Below, the manufacture method of using one-piece type coil of terminal and magnetic 7 shop drawings 1 and multi-joint choke shown in Figure 5 is described.At first, magnetic 7 is packed in the mould, dispose 2 one-piece type coils of above-mentioned terminal and make its position that has setting respectively relation.Afterwards, the mould of again magnetic 7 being packed into is pressed.The pressure of this compression moulding is for example 3 tons/cm ²In addition, after from mould, taking out, make its sclerosis 150 ℃ of heat treatments of carrying out about 1 hour.Then, the surface along magnetic 7, separately end 32 is bent to bottom surface portions from the side, form first input end 2, the second input terminals, 5, the first lead-out terminals 3 and second lead-out terminal 6.

In addition, expose formation substrate layer 52 on the surface portion of magnetic 7 at first input end 2, first lead-out terminal 3, second input terminal 5 and second lead-out terminal 6, and the formation the superiors 53 make it cover this substrate layer 52.Substrate layer 52 is preferably nickel (Ni) layer, and the superiors 53 are preferably solder layer or tin (Sn) layer.In addition, form dielectric film 51 on the surface of the coil portion in being embedded in magnetic 7 34.

As mentioned above, on the terminal that exposes on the surface of multi-joint choke, comprise up to its bottom surface portions, like this, can more multi-joint choke be installed on the substrate as the solder layer that the superiors 52 form.In addition, because terminal is folded into the following of multi-joint choke rather than its side, thereby can reduce when being installed to multi-joint choke on the substrate, to install shared area.Have again, owing on terminal, form the Ni layer in the present embodiment, on substrate layer 52, form solder layer, thereby can prevent the oxidation of Ni layer, and can obtain good solder performance as the superiors 53 as substrate layer 52.

For example, occasion at the multi-joint choke of existing structure, when using under choke one side's terminal is not installed to state on the substrate etc. securely, also following situation can occur: situation or multi-joint choke that terminal is thrown off from substrate etc. because of heating produce from phenomenons such as handstand such as substrates.But, under the situation of the multi-joint choke of present embodiment,, thereby can prevent the generation of this bad phenomenon reliably because the good terminal area of solder performance is formed at from the side portion to the bottom surface.

In addition, first coil 1 and second coil 4 be owing to be to form by metal plate being carried out the punching press bending, thereby, compare with the coil that forms with Wire-wound, even also can keep little D.C. resistance and enough inductance value in the high frequency band use, and can flow through big electric current.In addition, even the number of turns of coil is few, owing to can guarantee enough inductance value, thereby can make that volume is little, the multi-joint choke of highly low structure.

Have, because first coil, 1 second coil 4 is embedded in the inside of magnetic 7, this magnetic 7 has good insulating properties again, thereby, can prevent from reaching faults such as producing short circuit between the coil portion 34 between a plurality of coils.Particularly, main component as the metal magnetic powder of magnetic 7, by using at least a or above material in iron content (Fe), nickel (Ni) and the cobalt (Co), can obtain to have the magnetic 7 of the magnetic characteristic of the high saturation magnetic flux density that can be applicable to big electric current and high permeability, can be made into the multi-joint choke of big inductance value.

Below, the action of the multi-joint choke of present embodiment is described.First coil 1 has the identical number of turns and identical coiling direction with second coil 4.When by first input end 2 and second input terminal 5 inflow currents, produce magnetic field, and the direction of passing the magnetic flux in each coil is same direction.First coil 1 and second coil 4 are configured to differing heights makes it form magnetic coupling.

Produce magnetic flux when flowing through electric current in first coil 1, this magnetic flux constitutes the center in the coil that passes first coil 1 and returns the magnetic circuit at the center in the coil of first coil 1 by the outside of first coil 1 again.Too, the magnetic flux of generation constitutes the center in the coil pass second coil 4 and returns the magnetic circuit at the center in the coil of second coil 4 by the outside of second coil 4 again when flowing through electric current in second coil 4.At this moment, because first coil 1 and second coil 4 are configured to differing heights, thereby, in the magnetic flux that in first coil 1, flows through the magnetic circuit that electric current produces, the magnetic flux that exists and overlap because of the magnetic flux by the magnetic circuit that electric current produced in second coil 4.In addition, in second coil 4, flow through in the magnetic flux of the magnetic circuit that electric current produces, exist similarly and the magnetic flux that overlaps because of the magnetic flux that in first coil 1, flows through the magnetic circuit that electric current produces.

Therefore, in first coil 1 and second coil 4, produce coupling.In addition, because that first coil 1 and second coil 4 are configured to is highly different, thereby the stack of the magnetic flux of the magnetic flux of the magnetic circuit that is produced by first coil 1 and the magnetic circuit that produced by second coil 4 more increases, and can realize high coupling.

Under the situation of multi-joint choke, its inductance value also is subjected to the influence of the coupling of first coil 1 and second coil 4.The coupling of first coil 1 and second coil 4 is along with changing because of the magnetic flux that flows through the magnetic circuit that electric current produces in first coil 1 with because of the stack degree of the magnetic flux that flows through the magnetic circuit that electric current produces in second coil 4.This stack also changes along with the configuration of first coil 1 and second coil 4.Therefore, if the distance of the central point of the central point of first coil 1 and second coil 4 is changed, then the stack of magnetic flux also changes.Therefore, even do not change the inductance value that the number of turns of first coil 1 and second coil 4 also can change multi-joint choke.That is, the distance of the central point by suitably changing first coil 1 and the central point of second coil 4 then can easily obtain the inductance value of stipulating.

In addition, similarly, the height and position of the central point that also can be by changing first coil 1 and the central point of second coil 4 changes the stack of magnetic flux equally.Therefore, also can not change the number of turns of first coil 1 and second coil 4 by this method and the inductance value of multi-joint choke is changed.Particularly, if change the height and position of coil, then realize the structure that volume is littler, highly low easily.

As mentioned above, the multi-joint choke of present embodiment can make volume little, can realize high coupling and applicable to the multi-joint choke of big electric current.Particularly, the multi-joint choke of present embodiment is best suited for a plurality of DC/DC transducers power circuit that constitutes in parallel shown in the circuit diagram of Fig. 6.

Fig. 6 represents to adopt the circuit diagram of the power circuit of heterogeneous mode.Input electric power 61 is imported into switch element 62, and the integrating circuit by chokes Figure 63 and capacitor 64 constitute is connected to output with load 65.In addition, use for example 500KHz as switching frequency.Power circuit shown in Figure 6 can be used for higher frequency and pass through big electric current with high efficient by a plurality of DC/DC transducers are carried out phase control and make its concurrent activity.But, in existing circuit structure, have pulsating current to produce as output.Obtain desired direct current as being output as, preferably reduce this pulsating current as far as possible; In order to reduce pulsating current, the inductance value that increases choke 63 is effective.

On the other hand,, must prevent that the magnetic flux appearance of choke 63 when big electric current flows through is saturated, for this reason, preferably reduce the inductance value of choke 63 in order to obtain being applicable to the power circuit of big electric current.Inductance value one is little, owing to can improve the dc superposition characteristic of choke 63, thereby can be corresponding better with big electric current.In addition, in the time of on for example preparing above-mentioned power circuit is contained in electronic equipment such as notebook computer, choke 63 also must be small-sized.

Therefore, when the multi-joint choke with present embodiment is used as the choke of power circuit shown in Figure 6, then can in high band, use, and can be with high efficient by big electric current.In addition, the multi-joint choke of present embodiment is because the distance of central point that can be by changing each coil or the inductance value that height and position obtains stipulating, therefore, can more freely tackle the situation that will suppress pulsating current and be applicable to the situation etc. of big electric current.

In addition, though the multi-joint choke of present embodiment is to make the one-piece type coil of bigeminy terminal, also can make three, tetrad or more than.Also can be point-blank with the one-piece type coil configuration of these terminals.In addition, point-blank the one-piece type coil of a plurality of terminals of configuration can also be configured in the plane side by side two row, triplex row or more than, perhaps be piled up configuration.Have, the number of turns of coil is not subjected to the restriction of 1.5 circles yet again.In addition, also not having special necessity does identically with coiling direction the number of turns of each coil.

As mentioned above, the multi-joint choke of present embodiment since can make volume little, can realize high coupling and applicable to the big multi-joint choke of electric current, thereby, effective especially under the situation that is loaded on electronic equipments such as mobile phone.

Embodiment 2

Below, with reference to Fig. 7 to Figure 10 the multi-joint choke of embodiments of the invention 2 is described.Though the basic structure of the multi-joint choke of present embodiment is identical with the multi-joint choke of embodiments of the invention 1, the feature of present embodiment is to have increased an one-piece type coil of terminal and it is arranged to V-shape.

Fig. 7 is the perspective elevation of the multi-joint choke of present embodiment.And Fig. 8 is the wiring diagram of this multi-joint choke.First coil 71 is made of one first input end 72 and first lead-out terminal 73.Second coil 74 similarly is made of one second input terminal 75 and second lead-out terminal 76.In addition, tertiary coil 77 also is made of one the 3rd input terminal 78 and the 3rd lead-out terminal 79.The coiling direction of each coil is identical, and the number of turns all is 1.5 circles.Like this, under the situation by each input terminal inflow current in first coil 71, second coil 74 and tertiary coil 77, the direction of passing the magnetic flux in the coil of first coil 71, second coil 74 and tertiary coil 77 is identical direction.

In addition, the central shaft of the central shaft of first coil 71, second coil 74 and the central shaft of tertiary coil 77 are parallel to each other, and its configuration makes win coil 71 and tertiary coil 74 be positioned at the upper strata, and make second coil 74 be positioned at lower floor.Like this, first coil 71, second coil 74 and tertiary coil 77 are configured to the V font.First coil 71, second coil 74 and tertiary coil 77 are embedded in the inside of magnetic 7, and magnetic 7 is become cuboid.In addition, the one-piece type coil of terminal used in the multi-joint choke of first coil 71, second coil 74 and tertiary coil 77 and embodiments of the invention 1 is identical, be the one-piece type coil of terminal, omit its explanation because of its manufacture method is identical by metal plate being carried out punching press and being folded to form.

Fig. 9 and Figure 10 are the profiles along the B1-B1 line of the multi-joint choke of present embodiment shown in Figure 7.In addition, though structurally to be identical, shown in Figure 9 arrow C 1, C2, C3 among these figure different with the direction of the part of arrow D1, D2 shown in Figure 10, D3.These arrow C 1, C2, C3, D1, D2, D3 represent to pass the direction of the magnetic flux in the coil of first coil 71, second coil 74 and tertiary coil 77.

The occasion of Fig. 9, represent respectively first coil 71, tertiary coil 77 from various places from first input end 72, the 3rd input terminal 78 inflow currents the time flow direction, and the flow direction when representing second coil 74 from second lead-out terminal, 76 inflow currents.Therefore, pass the flow direction in the coil of first coil 71, tertiary coil 77 and the flow direction that passes in the coil of second coil 74 becomes oppositely.This state is called positive coupling.

On the other hand, the occasion of Figure 10, the flow direction when representing first coil 71, second coil 74 and tertiary coil 77 respectively from separately first input end 72, second input terminal 75 and the 3rd input terminal 78 inflow currents.Therefore, the flow direction that passes in first coil 71, second coil 74 and tertiary coil 77 coil separately is identical.This state is called negative coupling.

Below, the action of the multi-joint choke of said structure is described.

Among Fig. 9, just produce magnetic flux when flowing through electric current in first coil 71, this magnetic flux constitutes the magnetic circuit at the center in the coil that center in the coil that passes first coil 71 and the outside by first coil 71 turn back to first coil 71 again.Constitute magnetic circuit when flowing through electric current in second coil 74 and the tertiary coil 77 similarly.At this moment, first coil 71, second coil 74 and tertiary coil 77 be owing to be configured to the V font, thereby, in the magnetic flux of the magnetic circuit that in flow through first coil 71, second coil 74 and tertiary coil 77 because of electric current, is produced, there is the magnetic flux that overlaps.Particularly, be that this magnetic flux overlaps the strongest part near the center of each coil.

Promptly, in the magnetic flux that in flow through first coil 71 because of electric current, is produced, the magnetic flux at center in the coil that passes second coil 74 is arranged, flowing through because of electric current in the magnetic flux that is produced in the tertiary coil 77 equally, the magnetic flux at the interior center of the coil of perforation second coil 77 is also arranged.And because that the direction of magnetic flux at the center in the coil of this second coil 74 of perforation is passed the flow direction at the center in the coil of second coil 74 when flowing through in second coil 74 with electric current is identical, thereby the magnetic flux that passes the center in second coil 74 increases.

In addition, in the magnetic flux that in flow through second coil 74 because of electric current, is produced, there is the magnetic flux at the center in the coil that passes first coil 71 and tertiary coil 77.And, because the flow direction that passes the center in the coil of this first coil 71 and tertiary coil 77 and electric current pass in the coil of first coil 71 when flowing through in first coil 71 and the tertiary coil 77 identical with the flow direction at the center that the coil of tertiary coil 77 is interior, thereby, pass in the coil of first coil 71 and the magnetic flux at the center in the coil of tertiary coil 77 increases.

Like this, produce big magnetic field in the multi-joint choke, then inductance value is bigger.Thereby, when the multi-joint choke with this positive coupling is used as the choke 63 of power circuit shown in Figure 6,, thereby can suppress pulsating current because the inductance value of the multi-joint choke of positive coupling is big, can use at high band, and can make power circuit applicable to big electric current.

Under the situation of structure shown in Figure 10, just produce magnetic flux when flowing through electric current in first coil 71, this magnetic flux constitutes the magnetic circuit at the center in the coil that center in the coil that passes first coil 71 and the outside by first coil 71 turn back to first coil 71 again.Constitute magnetic circuit when flowing through electric current in second coil 74 and the tertiary coil 77 too.At this moment, because first coil 71, second coil 74 and tertiary coil 77 are configured to the V font, thereby electric current flows through in the magnetic flux of the magnetic circuit that is produced in first coil 71, second coil 74 and the tertiary coil 77 and has the magnetic flux that overlaps.Particularly, be the strongest part of coincidence of this magnetic flux near the center of each coil.

Flow through in the magnetic flux that is produced in first coil 71 at electric current, have the magnetic flux at the center in the coil that passes second coil 74.Similarly, flow through in the magnetic flux that is produced in the tertiary coil 77, also have the magnetic flux at the center in the coil that passes second coil 74 at electric current.And, because the flow direction that passes the center in the coil that passes second coil 74 when the flow direction at the center in the coil of this second coil 74 and electric current flow through in second coil 74 is in the other direction, thereby the magnetic flux that passes the center in the coil of second coil 74 reduces.

In addition, in the magnetic flux that in flow through second coil 74 because of electric current, is produced, there is the magnetic flux at the center in the coil that passes first coil 71 and tertiary coil 77.And, because the flow direction that passes the center in the coil of this first coil 71 and tertiary coil 77 and electric current pass in the coil of first coil 71 when flowing through in first coil 71 and the tertiary coil 77 different with the flow direction at the center that the coil of tertiary coil 77 is interior, thereby, pass in the coil of first coil 71 and the magnetic flux at the center in the coil of tertiary coil 77 reduces.

The result is that the magnetic field that is produced in the multi-joint choke reduces, thereby can reduce inductance value.Therefore, when with the multi-joint choke of so negative coupling during,, thereby can improve the dc superposition characteristic of choke 63 because inductance value reduces as the choke 63 of power circuit shown in Figure 6, can make can with the power circuit that is applicable to bigger electric current.

The inductance value of the multi-joint choke of present embodiment is subjected to the influence of the coupling of first coil 71, second coil 74 and tertiary coil 77.That is, the coupling of first coil 71, second coil 74 and tertiary coil 77 changes with the coincidence degree of the magnetic flux that flows through the magnetic circuit that is produced in first coil 71, second coil 74 and the tertiary coil 77 because of electric current.This coincidence changes with the configuration of first coil 71, second coil 74 and tertiary coil 77.Therefore, be benchmark with second coil 74, the coil by making its two ends i.e. distance of the central point of the central point of first coil 71 and tertiary coil 77 changes, and can change the coincidence of magnetic flux.By the variation that this magnetic flux overlaps, the number of turns that need not change first coil 71, second coil 74 and tertiary coil 77 then can change the inductance value of multi-joint choke.

Herein, Figure 11 to Figure 13 B represents to try to achieve the result of the relation of the distance of central point of the central point of first coil 71 of multi-joint choke of present embodiment of positive coupling or negative coupling and second coil 74 or height and position and inductance value.

Figure 11 is the perspective elevation of being released and represent in the subregion of the coil portion 34 of the one-piece type coil of terminal used in the present embodiment and the magnetic 7 around it.Magnetic core as magnetic 7 is that long * wide * height is the cuboid of 10mm * 10mm * 3.5mm, and the internal diameter of the coil portion 34 of the one-piece type coil of terminal is 4.2mm, and external diameter is 7.9mm, highly is 1.7mm, its magnetic permeability mu=26.In addition, among Fig. 7-Figure 10, though the number of turns is 1.5 circles, above-mentioned relation is that 3 circles are tried to achieve with the number of turns.

In addition, the perspective elevation (Figure 12 A) and the profile (Figure 12 B) of the arrangement of Figure 12 A and Figure 12 B multi-joint choke when using the coil portion 34 of the one-piece type coil of terminal shown in Figure 11.These figure be explanation be used for trying to achieve respectively with second coil 74 be benchmark, and first coil 71 between and and tertiary coil 77 between distance D and the relation of inductance value, and be the structure chart of the relation of the height and position H of first coil 71 of benchmark and tertiary coil 77 and inductance value with second coil 74.

Figure 13 A keeps height and position H necessarily, promptly to be made as H=2.7mm, the result of the inductance value L that tries to achieve when making distance D (this distance with the central point of the central point of tertiary coil 77 and the second coil 74 equates) change of the central point of the central point of first coil 71 and second coil 74.Inductance value increase when disposing than negative coupling when according to this result as can be known, coil is positive coupling configuration.In addition, by being changed, distance D can change inductance value L.

Figure 13 B is that expression will be apart from keeping certain, when height and position H is changed and the graph of a relation of inductance value L.As indicated in this figure, can see by height and position H is changed also can changing inductance value L.At this moment, it is certain that distance D keeps, and its value is D=6.5mm.

Therefore, thereby the position of the central point of central point by changing first coil 71 and tertiary coil 77 changes distance D, height and position H, and just can make inductance value L is the multi-joint choke of desired value.In addition, in the present embodiment, though the distance of the central point of the central point of the distance of the central point of first coil 71 and the central point of second coil 74 and tertiary coil 77 and second coil 74 is identical, the present invention is not limited thereto.These distances also can be different.In addition, among the present invention, though first coil 71 is identical with the height and position of tertiary coil 77, needn't be necessarily identical, also can be different.

According to these results, can with second coil 74 distance of the central point of the central point of baseline configuration first coil 71 and tertiary coil 77 according to design, thereby obtain having the multi-joint choke of the structure that the inductance value of making increases, when with this multi-joint choke as with the choke 63 of the same power circuit shown in Figure 6 of the multi-joint choke of embodiment 1 time, then can make and to suppress pulsating current, be applicable to the power circuit of high band and big electric current.

On the other hand, similarly can be according to the distance of the central point of the central point of design configurations first coil 71 and tertiary coil 77, thereby obtain having the multi-joint choke of the structure that suppresses inductance value, when with this multi-joint choke as with the choke 63 of the same power circuit shown in Figure 6 of the multi-joint choke of embodiment 1 time, then can improve the dc superposition characteristic of choke 63, can also obtain to be applicable to the power circuit of bigger electric current.

In addition, though the multi-joint choke of present embodiment makes three with coil, also can be increased on the line tetrad or more than.In addition, can also with the one-piece type coil of a plurality of terminals that disposes on the straight line in one plane side by side two row, triplex row or more than, can also make laminated construction.Have, the number of turns of coil also is not limited to 1.5 circles again.In addition, the number of turns of each coil also can be different with coiling direction.Moreover, in the present embodiment,, also can be configured to inverted v-shaped though the configuration of each coil is the V font.

Have again, as shown in figure 14, also the one-piece type coil 122 of terminal can be configured in straight line on the one-piece type coil 121,121 of a plurality of terminals that the disposes position of departing from.Therefore, the filling rate of the coil in the magnetic 7 can be improved, the miniaturization more of multi-joint choke integral body can be made.

As mentioned above, the multi-joint choke of present embodiment since can obtain volume little, can realize high coupling, applicable to the multi-joint choke of big electric current, thereby, can bring into play great effect in the time of on being used for electronic equipment such as mobile phone.

Embodiment 3

Below, with reference to Figure 15 and Figure 16 the multi-joint choke of embodiments of the invention 3 is described.The basic structure of the multi-joint choke of present embodiment is identical with the multi-joint choke of embodiment 1.

Figure 15 is the perspective elevation of the multi-joint choke of present embodiment.The used coil of first coil 131, second coil 132 and tertiary coil 133 and the multi-joint choke of embodiment 1 is identical, is made of through the one-piece type coil of terminal that pressing lap forms metal plate.The number of turns of each coil all is 2.5 circles.

Figure 16 is the profile along the B2-B2 line of multi-joint choke shown in Figure 15.The central shaft of the central shaft of the central shaft of first coil 131, second coil 132 and tertiary coil 133 is parallel to each other, and its configuration makes first coil 131 and tertiary coil 133 be positioned at the upper strata, and second coil 132 is positioned at lower floor.In addition, the end 136 with first overhang 134, second overhang 135 and tertiary coil disposes at grade.The coil portion of first coil 131, second coil 132 and tertiary coil 133 is embedded in the inside of magnetic 7.

Below, the action of the multi-joint choke of said structure is described.

The multi-joint choke of present embodiment can realize similarly to Example 1 that by the coupling of coil volume is little, can carry out high coupling and can be applicable to big electric current.The multi-joint choke of present embodiment is being by having following characteristics aspect the number of turns of coil and the configuration, thereby can further make the little and highly low structure of volume.

As shown in figure 16, above the right side part with 2 circles, second coil 132 highly, lamination has the left part of first coil 131 of 3 circle height.In addition, lamination has the right side parts of the tertiary coil 133 of 2 circle height above the left part with 3 circles, second coil 132 highly.Like this, first coil 131, second coil 132 and tertiary coil 133 can be configured as the coil with 2.5 circles respectively.Therefore, first coil 131 and tertiary coil 133 are configured in the upper strata making, and when second coil 132 is configured in the structure of lower floor, can easily make the not laminated construction of coil wasting space, that compactedness is big.Like this, can make further that volume is little, the multi-joint choke of highly low structure.

When so multi-joint choke is used as the choke 63 of power circuit shown in Figure 6, can guarantee upward desired inductance value of design at an easy rate, also miniaturization can be realized, and small-sized, high performance power circuit equipment can be made.

Embodiment 4

Use Figure 17 A, Figure 17 B and Figure 18 that the multi-joint chokes figure of embodiments of the invention 4 is described.Figure 17 A is the perspective elevation of the multi-joint choke of present embodiment, and Figure 17 B is its wiring diagram.Figure 18 is the profile along the A2-A2 line of the multi-joint choke shown in Figure 17 A.

At first, because the one-piece type coil of terminal 50 is as long as make according to the method identical with the Fig. 3 of embodiment 1 and manufacture method shown in Figure 4, thereby omit its explanation.In addition, the number of turns of the one-piece type coil 50 of terminal needn't be in particular integer, can freely be set at 1.5 circles, 1.75 circles etc.In addition, about the size of coil and inductance value etc. too.In an embodiment, only these coils are done following explanation as the one-piece type coil 50 of terminal.Therefore, for connected terminal, also only input terminal 20 and lead-out terminal 30 are described.In addition and since magnetic 7 also can be produce according to identical manufacture method with embodiment 1 in the identical parts of material of explanation, thereby omit its explanation.

The multi-joint choke of present embodiment constitutes by the one-piece type coil 50 of a plurality of terminals being configured in the magnetic 7.Multi-joint choke is configured in the position relation of the one-piece type coil 50 of terminal with regulation in the mould at first respectively, carries out press forming with the part that magnetic 7 covers except that the end.Because its press forming condition also can be identical with embodiment 1, thereby omit its explanation.

Bending exposes outside its outer field surface from magnetic 7 outstanding ends, for preventing by the oxidation of copper or the terminal that constitutes of silver and improve the reliability that solder etc. is connected that formation is by the substrate layer 52 of nickel (Ni) or nickeliferous (Ni) alloy formation on the exposed portions serve of terminal.And then, at this Ni or contain the superiors 53 that form soft solder or tin (Sn) or plumbous (Pb) on the substrate layer 52 of Ni alloy.

These all ends of exposing all form input terminal 20 and lead-out terminal 30 along the bottom surface of multi-joint choke with the face bending of bottom surface adjacency.Like this, owing to be essentially no pin configuration, thereby, compare with the existing multi-joint choke of band pin configuration and can carry out high-density mounting.Above-mentioned manufacture method is also identical with embodiment 1 basically.

In addition, also the occasion with embodiment 1 is identical for this point of magnetic 7 preferred rectangular shapes.Like this, for the required adsorption operations that carries out automatically being installed and also can being realized at an easy rate with the location of printed panel etc.In addition, both can indicate the direction of installation and the polarity of terminal, also can carry out chamfering.No matter have, be polygonal or cylindrical again, as long as upper surface is an even shape, is not particularly limited.

Below, the configuration structure that is embedded in a plurality of coils in the magnetic 7 is described.In the present embodiment, shown in Figure 17 A, with the size of coil, all identical 2 coil arrangement of the number of turns and make in the direction of the magnetic flux that the center produced of each coil opposite on same plane.Figure 17 B is its wiring diagram, indicates power supply connecting portion I1, I2, O1, O2 respectively on the input terminal 20 of the one- piece type coil 50,50 of each terminal and lead-out terminal 30.

Have under the situation that adopts above structure, the situation in the magnetic field that is produced is described.Figure 19 A and Figure 19 B are the profile along the B3-B3 line shown in Figure 17 A, and the direction of passing the magnetic flux in each coil when electric current flows through is different mutually.Therefore, the magnetic circuit of formation makes the magnetic flux stack of passing in each coil.Its result, the inductance value of each coil increases.Produce such magnetic flux coupling coil direction be configured to positive coupling structure.

On the other hand,, also be arranged such that when each coil midstream overcurrent, pass the identical multi-joint choke structure of direction of the magnetic flux in the coil though size and 2 all identical coils of the number of turns of coil are arranged at grade with Figure 17 A sample the samely.Figure 20 A is the perspective elevation that the one-piece type coil 50 of the terminal of identical coiling direction is arranged in the multi-joint choke on the same level.Figure 20 B represents its wiring diagram.On the input terminal 20 of the one- piece type coil 50,50 of each terminal and lead-out terminal 30, indicate separately power supply connecting portion I1, I2, O1, O2.

Figure 21 A and Figure 21 B are the profiles of this multi-joint choke, and the direction of passing the magnetic flux in each coil when electric current flows through is all identical.Therefore, though the magnetic flux that passes in each coil returns the original place by the outside of coil, a little less than the coupling of the magnetic flux of this situation, the magnetic circuit of Xing Chenging makes that the magnetic flux that is produced is the direction of cancelling out each other in multi-joint choke integral body respectively.Just can obtain to suppress the saturated effect of magnetic flux.That is, the arrangement of this coil is negative coupling.

As mentioned above, the configuration of positive coupling and the negative coupling characteristic that can obtain having nothing in common with each other.Below, between the central point of 2 coils that carry out positive coupling of trying to achieve apart from the relation of R and inductance value L and adopt between the central point of 2 coils of negative coupling configuration result to describe apart from the relation of R and inductance value L.

Figure 22 A is a coil portion 34 of expression and the perspective elevation of surrounding the part of its magnetic 7 on every side.Coil portion 34 is of a size of internal diameter 4.2mm, external diameter 7.9mm, height 1.7mm, and its number of turns is 3 circles.In addition, the permeability of the magnetic core that is made of magnetic 7 is μ=26, is of a size of 10mm * 10mm * 3.5mm, is L=0.595 μ H by these inductance value L that obtain.

Figure 22 B and Figure 22 C are that expression is with the coil portion 34 of the unit structure shown in 2 Figure 22 A and the perspective elevation and the plane graph of magnetic 7 configurations structure at grade.In the multi-joint choke of this structure, be parameter with the architectural difference of positive coupling structure and negative coupling structure, the result from R and inductance value L is illustrated among Figure 22 D with the Correlation Centre dot spacing.

When being 10mm apart from R between the central point of 2 coils 50,50, the inductance value L of positive coupling structure is 0.579 μ H, and the inductance value L of negative coupling structure is littler by 1.4% than the inductance value L of positive coupling structure, is 0.571 μ H.Equally, when distance was 9.2mm between central point, the inductance value L of positive coupling structure was 0.583 μ H, and negative coupling structure is littler by 2.7% than it, is 0.567 μ H.

That is to say, in positive coupling structure, along with reduce its inductance value L increase between central point apart from R.On the other hand, in negative coupling structure, along with reducing apart from R between central point, its inductance value L also reduces.In a word, as long as positive coupling structure reduces just can increase inductance value L apart from R between central point, can not obtain big inductance value even do not increase the number of turns of each coil yet.Have again, since more little between the central point of coil apart from R, can increase inductance value L more, thereby help realizing the miniaturization of multi-joint choke.

On the other hand, more little apart from R between the central point of the coil of negative coupling structure, inductance value is also more little.In negative coupling structure,, prevent easily that also magnetic flux is saturated even there is big electric current to flow through because the D.C. magnetic field composition that is produced in each coil is cancelled out each other.That is, negative coupling structure is compared with the occasion that a plurality of chokes that are made of 1 coil are used in combination by adopting the choke of built-in a plurality of coils, can not only realize miniaturization, can also improve dc superposition characteristic significantly.

Below, the multi-joint choke that disposed 3 one-piece type coils of terminal in magnetic 7 (below, become 3 chokes) is described.

Figure 23 A is the perspective elevation of expression with 3 one-piece type coil 501,502,503 configurations of terminal structure point-blank.In addition, in order to distinguish the one-piece type coil of these terminals, be called right coil 501, central coil 502 and left coil 503 below respectively.Figure 23 B represents this configuration structure, and each coil is the wiring diagram of 3 chokes of positive coupling frame mode configuration.In addition, Figure 23 C is with one-piece type coils 501,503,504 configurations of 3 terminals point-blank equally, is the perspective elevation of 3 chokes of negative coupling structure.Equally, in order to distinguish the one-piece type coil 501,503,504 of these terminals, below, be called right coil 501, central coil 504 and left coil 503 respectively.In this structure, comprise central coil 504, the coiling direction of right coil 501 and left coil 503 is all identical.Figure 23 D represents the wiring diagram of this multi-joint choke.In addition, Figure 23 B utilizes among Figure 23 D, and the power supply connecting portion of input terminal 20 and lead-out terminal 30 is expressed as I1, I2, I3, O1, O2, O3 respectively.

The result because of the inductance value L of each coil due to the positive coupling structure of coil and negative coupling structure different of table 1 expression present embodiment.

Table 1

The coupling structure		Coil configuration and flow direction	Inductance value (μ H)
				The coupling structure	Positive coupling structure	Figure 23 A, Figure 23 B	Right coil	501 0.5798 central coil 502 0.5870 left coils 503 0.5798
Negative coupling structure	Figure 23 C, Figure 23 D	Right coil	501 0.5715 central coil 504 0.5704 left coils 503 0.5715

As shown in Table 1, the average inductance value of 3 coils, the configuration of positive coupling structure is bigger during than the configuration of negative coupling structure.Only with regard to central coil 502, the inductance value of negative coupling structure is 0.5704 μ H, and 0.5870 μ H during than positive coupling structure is little by 2.8%.

As mentioned above, even in 3 chokes that used 3 one-piece type coils 501,502,503 of terminal, also same with the occasion of having used 2 one-piece type coils 50 of terminal, by positive coupling structure and negative coupling structure, perhaps can at random regulate inductance value L apart from R between the central point of coil, owing to can set correspondingly inductance value L according to the use order of multi-joint choke, thereby realize optimal design easily.

In addition, in the present embodiment, though bright be 2 and 3 to connect structures, the invention is not restricted to this.4 or the above one-piece type coil configuration of terminal can also be made 4 or above structure point-blank.In addition, point-blank the one-piece type coil of terminal of configuration can also be configured to side by side 2 row or more than.

And, on the position of leaving the configuration one-piece type coil of a plurality of terminals point-blank, also can dispose the one-piece type coil of at least one terminal.Figure 24 A is configured to the V font at grade with the one-piece type coil 505,506,507 of 3 terminals of same number of turns, makes the perspective elevation of the multi-joint choke of negative coupling structure.In addition, Figure 24 B is its end view, and Figure 24 C is a wiring diagram.Each input terminal 5052,5062,5072 made by the one-piece type coil 505,506,507 of terminal and lead-out terminal 5053,5063,5073 is shown as unidirectional structure.Such coil is also similarly to Example 1 by corroding metal plate or the punch process making.Like this, by a plurality of coils of alternate configurations, also can increase the filling rate of the one-piece type coil 505,506,507 of terminal in the magnetic 7 and make the choke integral miniaturization.

In addition, in the multi-joint choke of structure shown in Figure 23 A, also the coil of the different number of turns can be made up.For example, Figure 25 is the profile that the central point of the one-piece type coil of terminal is configured to the multi-joint choke of structure point-blank.The occasion of this structure is arranged side by side the configuration point-blank of central point of each coil 508,509,510 of the one-piece type coil 509,510 of terminal of 2 circles and the one-piece type coil 508 of terminal that the number of turns is 3 circles with the number of turns.

Like this, adopt present embodiment, do not change the number of turns and the size of coil, and by adopting the positive coupling structure or the negative coupling structure of a plurality of coils, and adjust between the central point of each coil distance and it is embedded in the magnetic 7, can not only control inductance value accurately according to design, and can make that volume is little, the multi-joint chokes figure of highly low structure.

The multi-joint choke that will be made of these structures is during as the choke of the power circuit illustrated in fig. 6 of embodiment 1, for example, with regard to the multi-joint choke of the built-in one-piece type coil of a plurality of terminals that adopts positive coupling structural arrangements, can obtain big inductance value.Therefore, if used as choke 63, then can obtain the power circuit of may command pulsating current.

In addition, for example, with regard to the multi-joint choke of the built-in one-piece type coil of a plurality of terminals that adopts negative coupling structural arrangements, owing to can obtain little inductance value at an easy rate, thereby, can make power circuit applicable to bigger electric current.In addition, such power circuit is preferably used as the power circuit of personal computer and mobile phone etc.

Embodiment 5

Figure 26 is the perspective elevation of the multi-joint choke of embodiments of the invention 5.In the present embodiment, use 2 terminals one-piece type and it is embedded in the magnetic 607.First coil, 601 integrally formed first input end 602 and first lead-out terminals 603.Second coil, 604 same integrally formed second input terminal 605 and second lead-out terminals 606.Though the coiling direction of each coil is different, the number of turns all is 2 circles.Like this, when electric current when each terminal of first input end 602 and second input terminal 605 flows into first coil 601 and second coil 604, the flow direction in each coil of first coil 601 and second coil 604 is a different directions.

In addition, the central shaft of the central shaft of first coil 601 and second coil 604 is parallel to each other, and it is configured to 1 circle of second coil 604 is clipped in 2 circles of first coil 601.First coil 601 and second coil 604 are embedded in the inside of magnetic 607, and magnetic 607 is made rectangular shape.Adopt such configuration, can make first coil 601 and second coil 604 form magnetic coupling.

Like this, because the multi-joint choke of present embodiment is a rectangular shape, easy operating when automatically multi-joint choke being installed.

Use Figure 27 and Figure 28 that manufacture method and concrete structure thereof as the one-piece type coil of terminal of first coil 601 and second coil 604 are described herein.

At first, as shown in figure 27, by metal plate being corroded or the punching press flat board that is made of following three parts is made in punching press, that is: 2 circular-arc parts 631, connect the coupling part 633 of these 2 circular-arc parts 631 and the end separately 635 that prolongs from an end of 2 circular-arc parts 631.In addition, metal plate so long as low resistances such as copper or silver, high thermal conductivity materials all can, be not particularly limited.

Have again, form dielectric film 632 on the surface of 2 circular-arc parts 631.Like this, make it overlapping up and down and in the coil portion 634 that constitutes in that circular-arc parts 631 are folding with 2 of punching press flat board, can prevent short circuit as 631 of the circular-arc parts of coil.In addition, 633 surface does not form dielectric film 632 in the coupling part.Like this, owing on the zone except coupling part 633, establish dielectric film 632, thereby, even crooked coupling part 633 breaking of dielectric film 632 can not taken place yet or peels off etc., can suppress to come from the deterioration of the coil characteristics that such dielectric film 632 causes.

This punching press flat board overlaps its central point by bending with coupling part 633 2 circular-arc parts 631 as shown in figure 28, thereby makes 2 circular-arc parts 631 form coil portions 634.In addition, the center of 2 end 635 relative coils 634 is arranged to radial, thereby forms the one-piece type coil of terminal.In addition, in the present embodiment, first coil 601 and second coil 604 are owing to make structure in 2 circles that 1 circle with second coil 604 is clipped in first coil 601, thereby, with regard to coil portion 634 separately, be provided with gap size exactly and only be the lamination under the gauge situation of circular-arc part 631.

By adopting such punching press flat board, because the coil portion 634 that forms at circular-arc part 631 laminations has used the insulation processing of having carried out with dielectric film 632, thereby the gap is not set between circular-arc part 631 also can be superimposed, can make the high multi-joint choke of duty ratio.

In addition, what Figure 27 and Figure 28 were represented is to be the situation of 2 circles as the one-piece type coil of terminal, but obviously, as long as further increase the quantity of circular-arc part 631 under the dull and stereotyped state of punching press, just can make 3 circle or the above one-piece type coils of terminal at an easy rate.

In addition, as magnetic 607, owing to can utilize the material of explanation among the embodiment 1 and manufacture method to make, thereby omit its explanation.

About the manufacture method of multi-joint choke shown in Figure 26,, omit its explanation equally owing to also can utilize the manufacture method identical to make with embodiment 1.

Figure 29 represents along the profile of the A3-A3 line of multi-joint choke shown in Figure 26.First input end 602 and first lead-out terminal 603 of first coil 601 forms along the bottom surface from the side of magnetic 607.In addition, be exposed at first input end 602 and first lead-out terminal 603 on the surface portion of magnetic 607 and form substrate layer 52, on substrate layer 52, form the superiors 53 its covering.Substrate layer 52 is preferably to electroplate nickel (Ni) layer that forms, the superiors' 53 preferred solder layer or tin (Sn) layer.These are all identical with embodiment 1.

Like this, first input end 602, second input terminal 605, first lead-out terminal 603 and second lead-out terminal 606 are owing to form for example solder layer as the superiors 53 on the area part that bends in the bottom surface of magnetic 607, thereby, can more multi-joint choke be installed on printed circuit board (PCB) etc.In addition, owing to make no pin configuration by this, thereby can also install with high density.

First coil 601 of the multi-joint choke of present embodiment and second coil 604 are metal plate to be carried out the punching press bending form.Therefore, with comparing of past, be easier to guarantee that at necessary inductance value of high band and low dc resistance, its result satisfies the requirement of big electric current easily with Wire-wound and at the coil that the fore-end mounting terminal of lead constitutes.

In addition, even because the number of turns of coil seldom also can be guaranteed necessary inductance value, thereby, can realize that volume is little, the multi-joint choke of highly low structure.

In addition, first coil 601 and second coil 604 are embedded in the inside of magnetic 607, and the insulating properties of this magnetic 607 is good, can prevent to reach between the coil portion 634 between the coil short trouble to occur, can make the multi-joint choke of high reliability.Particularly, because the main component of metal magnetic powder adopts one or more the magnetic 607 that comprises from iron (Fe), nickel (Ni), cobalt (Co) selection, thereby can obtain magnetic 607 with magnetic characteristics such as high saturation magnetic flux density and high permeabilities applicable to big electric current, can make the big multi-joint choke of inductance value.

Below, the action of the multi-joint choke of said structure is described.

First coil 601 is identical with the number of turns of second coil 604, but coiling direction is opposite.Therefore, when first input end 602 and second input terminal 605 electric currents flow through, because of passing flow direction in each coil for oppositely in the magnetic field that is produced.Figure 30 is the profile along the B4-B4 line of the multi-joint choke of present embodiment shown in Figure 26, the direction of representing to pass the magnetic flux in each coil with arrow.The direction of the magnetic flux in each coil of first coil 601 and second coil 604 is opposite, is positive coupling structure.

On the other hand, Figure 31 is the profile along the B4-B4 line of multi-joint choke shown in Figure 26 equally, the direction of representing to pass the magnetic flux in each coil with arrow.In this occasion, electric current flows into from second lead-out terminal 606 of first input end 602 and second coil 604 of first coil 601, and the flow direction in the flow direction in the coil of first coil 601 and the coil of second coil 604 is identical, is negative coupling structure.

Below, the action of the multi-joint choke of said structure is described.

As shown in figure 30, though produce magnetic flux when electric current flows through first coil 601, the magnetic circuit that this magnetic flux constitutes is to pass in the coil of first coil 601, and turns back in the coil of first coil 601 by the outside of first coil 601 again.When flowing through second coil 604, electric current constitutes magnetic circuit too.

At this moment, first coil 601 and second coil 604 be owing to be configured to part interlock mutually, thus in first coil 601 and second coil 604 because of electric current flows through in the magnetic flux of the magnetic circuit that is produced, have the magnetic flux that overlaps.It particularly near the center of each coil the stronger part of coincidence of this magnetic flux.

That is to say,, flow through the magnetic flux that also has in the magnetic flux that second coil 604 produced in the coil that passes first coil 601 because of electric current equally because of electric current flows through the magnetic flux that has in the magnetic flux that first coil 601 produced in the coil that passes second coil 604.And, because it is identical to pass the direction of the magnetic flux in the coil that passes first coil 601 when the direction of the interior magnetic flux of the coil of this first coil 601 flows through in second coil 604 with electric current, thereby these magnetic flux stacks increase the magnetic flux in the coil that passes first coil 601.In addition, for second coil 604 because stack similarly, thereby the magnetic flux in the coil that passes first coil 601 is increased.

Like this, in multi-joint choke, produce big magnetic field, make inductance value bigger.Therefore, when the multi-joint choke that will make positive coupling structure during as the choke 63 of the power circuit shown in Figure 6 of embodiment 1, because the inductance value of the multi-joint choke of positive coupling can increase, thereby, can make and can suppress pulsating current, and at the power circuit of high band applicable to big electric current.

In addition, in the multi-joint choke of structure shown in Figure 31, though produce magnetic flux when electric current flows through first coil 601, the magnetic circuit that this magnetic flux constitutes is to pass in the coil of first line 601, and turns back in the coil of first coil 601 by the outer rear flank of first coil 601 again.Have again, constitute magnetic circuit when electric current flows through second coil 604 too.At this moment, because first coil 601 and second coil 604 are configured to the mutual interlock of a part of coil, thereby in the magnetic flux that flows through the magnetic circuit that first coil 601 and second coil 604 produced because of electric current, there is the magnetic flux that overlaps.It particularly near the center of each coil the stronger part of coincidence of this magnetic flux.

As shown in figure 31, in flow through the magnetic flux that first coil 601 produced because of electric current, the magnetic flux in the coil that passes second coil 604 is arranged, the magnetic flux in the coil that passes first coil 601 is also arranged in flow through the magnetic flux that second coil 604 produced because of electric current equally.

And, because it is opposite that electric current flows through the direction of the magnetic flux in the coil that passes second coil 604 when the direction of passing the magnetic flux in the coil that second coil 604 produced and electric current flow through first coil 601, thereby the magnetic flux that passes in the coil of second coil 604 reduces.In addition, similarly, because the flow direction that electric current flows through in the coil that passes first coil 601 when the direction of passing the magnetic flux in the coil that first coil 601 produced flows through second coil 604 with electric current is different, thereby the magnetic flux that passes in the coil of second coil 604 reduces.Like this, the magnetic field that is produced in the multi-joint choke is reduced, can suppress magnetic flux and occur saturated.

Therefore, when the multi-joint choke that will bear the coupling structure during equally as the choke 63 of the power circuit shown in Figure 6 of embodiment 1, because it is saturated to suppress magnetic flux, thereby can improve the dc superposition characteristic of choke 63, can make power circuit applicable to bigger electric current.

In addition, the inductance value of multi-joint choke is subjected to the influence of the coupling state of first coil 601 and second coil 604.The coupling of this first coil 601 and second coil 604 changes along with the magnetic flux that flows through the magnetic circuit that first coil 601 and second coil 604 produced because of electric current overlaps degree, and this coincidence degree changes with the configuration of first coil 601 and second coil 604.

Therefore, as long as the distance of the central point of the central point of the coil of first coil 601 of the multi-joint choke of change and the coil of second coil 604 just can change the coincidence degree of magnetic flux, its result, even do not change the number of turns of first coil 601 and second coil 604, also can change the inductance value of multi-joint choke.Like this, just can obtain design simply and go up necessary inductance value.

Below, according to concrete example between the central point of the coil of the central point of the coil that changes first coil 601 and second coil 604 apart from the time, the distance R between central point and the relation of coupling describe.Below, establish first coil 601 and second coil 604 is of a size of: external diameter 8mm, internal diameter 4mm, thickness of slab 0.5mm; Magnetic 607 is of a size of length * wide * height=10mm * 10mm * 3.5mm.

Figure 32 A is that the distance R between the central point of the central point of first coil 601 and second coil 604 is the profile of the multi-joint choke that constitutes of R=6mm.Equally, Figure 32 B is to be profile under the R=7mm situation apart from R between central point, and Figure 32 C is to be profile under the R=8mm situation apart from R between central point.The basic structure of these figure performance is structure shown in Figure 26, expression be section configuration along the B4-B4 line.In addition, Figure 32 D is to be the profile of R=0mm occasion apart from R between central point.In this case, because integral body miniaturization more, thereby the size of magnetic 607 is littler than the structure shown in Figure 32 A-Figure 32 C.

In the occlusion portion of 2 of the multi-joint choke of structure coils, the circular-arc part 631 that constitutes the coil portion of second coil 604 is clipped between 2 circular-arc parts 631 of the coil portion that constitutes first coil 601 shown in Figure 32 A.In addition, constituting the central point 641,642 of the coil section in left side separately of 2 circular-arc parts 631 of coil portion of first coil 601 and the central point 643,644 of coil section on 2 circular-arc part 631 right sides separately that constitutes the coil portion of second coil 604 all is configured on the same straight line.This is because each size of first coil 610 and second coil 604 all is: the external diameter of coil portion is 8mm, and internal diameter is 4mm, and the distance between the central point of coil is due to the 6mm.

In addition, in the occlusion portion of 2 of the multi-joint choke of structure coils, the circular-arc part 631 that constitutes the coil portion of second coil 604 is clipped between 2 circular-arc parts 631 of the coil portion that constitutes first coil 601 shown in Figure 32 B.And, constitute the central point 641,642 of coil section in left side separately of 2 circular-arc parts 631 of coil portion of first coil 601 and the outer peripheral portion 645,646 of coil section on right side separately of 2 circular-arc parts 631 that constitutes the coil portion of second coil 604 and be configured on the same straight line.This is because each size of first coil 610 and second coil 604 all is: the external diameter of coil portion is 8mm, and internal diameter is 4mm, and the distance between the central point of coil is due to the 7mm.

In addition, shown in Figure 32 C in the occlusion portion of 2 of the multi-joint choke of structure coils, be provided with between 2 circular-arc parts 631 of the coil portion that constitutes first coil 601 with the part of the circular-arc part 631 of the coil portion that constitutes second coil 604 overlapping.Its overlapping degree is configured on the same straight line outer peripheral portion 647,648 of coil section in left side separately of 2 circular-arc parts 631 of the coil portion that constitutes first coil 601 and the outer peripheral portion 645,646 of coil section on right side separately of 2 circular-arc parts 631 that constitutes the coil portion of second coil 604.This is because each size of first coil 601 and second coil 604 all is: the external diameter of coil portion is 8mm, and internal diameter is 4mm, and the distance between the central point of coil is due to the 8mm.

Have again, shown in Figure 32 D in the occlusion portion of 2 of the multi-joint choke of structure coils, constitute 2 circular-arc parts 631 of coil portion of first coil 601 and 2 circular-arc parts 631 that constitute the coil portion of second coil 604 and be configured to overlapping fully.Promptly constituting the central point 649,650 of 2 circular-arc parts 631 of coil portion of first coil 601 and the central point 651,652 of 2 circular-arc parts 631 that constitutes the coil portion of second coil 604 is configured on the same straight line.In addition, the central shaft of the coil of first coil 601 is the axis by the central point 649,650 of these 2 circular-arc parts 631, and same, the central shaft of the coil of second coil 604 is the axis by the central point 651,652 of 2 circular-arc parts 631.This is because each size of first coil 601 and second coil 604 all is: the external diameter of coil portion is 8mm, and internal diameter is 4mm, and the distance between the central point of coil is due to the 0mm.

Magnetic flux in the coil of second coil 604 that the occasion of the structure of the multi-joint choke shown in Figure 32 A, electric current are produced when flowing through first coil 601 can not blocked by the circular-arc part 631 of second coil 604.Magnetic flux in first coil 601 that is produced when equally, electric current flows through second coil 604 can not blocked by the circular-arc part 631 of first coil 601 yet.Therefore, the magnetic circuit of the multi-joint choke of this structure can be by first coil 601 and 604 blocking-up of second coil, and its result can increase the net sectional area of the coupling in each coil.

In addition, the multi-joint choke of this structure does not exist only in the external diameter and the identical situation of internal diameter of the coil of interlock as mentioned above, sets up under the not identical situation of the difference of the external diameter of interlock coil and internal diameter yet.For example, external diameter at the coil portion of first coil 601 is 9mm, internal diameter is 7mm, and the external diameter of the coil portion of second coil 604 is 8mm, internal diameter is under the situation of 6mm, if the distance between the central point of the central point of the coil of first coil 601 and the coil of second coil 604 is 6.5mm, then still can realize the multi-joint choke of aforesaid high coupling.

In addition, in the structure of the multi-joint choke shown in Figure 32 A, though the distance between the central point of the central point of first coil 601 and second coil 604 is set at the central point 641 of coil section in the left side separately of 2 circular-arc parts 631 that make the coil portion that constitutes first coil 601,642 and constitute the central point 643 of coil section on 2 circular-arc part 631 right sides separately of the coil portion of second coil 604,644 all on same straight line, but also not necessarily non-such setting is as long as and can guarantee the net sectional area of coupling in the coil fully and make it reach consistent degree.

In the structure of the multi-joint choke shown in Figure 32 B, the part of the magnetic flux in the coil of second coil 604 that electric current is produced when flowing through first coil 601 is blocked by the circular-arc part 631 of the coil portion of second coil 604.The part of the magnetic flux in the coil of first coil 601 that is produced when equally, electric current flows through second coil 604 is blocked by the circular-arc part 631 of the coil portion of first coil 601.Its result, the multi-joint choke of this structure can produce separately magnetic circuit by the part of first coil 601 and the blocking-up of second coil 604.Therefore, compare, can suppress its coupling with the multi-joint choke shown in Figure 32 A.

In the structure of the multi-joint choke shown in Figure 32 C, the part of the magnetic flux in the coil of second coil 604 that electric current is produced when flowing through first coil 601 is blocked by the circular-arc part 631 of the coil portion of second coil 604.The part of the magnetic flux in the coil of first coil 601 that is produced when equally, electric current flows through second coil 604 is blocked by the circular-arc part 631 of the coil portion of first coil 601.Its result, the multi-joint choke of this structure separately magnetic circuit can occur by the part of first coil 601 and the blocking-up of second coil 604.Therefore, the multi-joint choke comparison with structure shown in Figure 32 A and Figure 32 B can further suppress coupling.

In the structure of the multi-joint choke shown in Figure 32 D, because the central shaft arrangement of first coil 601 and the coil portion of second coil 604 becomes coaxial line, thereby, can not only more strengthen coupling, can also miniaturization.

As mentioned above, the net sectional area of coupling in the distance R between the central point of the central point of the coil by changing first coil 601 and the coil of second coil 604, not only scalable coupling degree, and scalable coil, thereby, can more freely regulate the coupling of multi-joint choke integral body.Like this, can easily realize having the multi-joint choke that necessary inductance value is gone up in design.

Embodiment 6

Figure 33 A and Figure 33 B are the profiles of structure of coil portion of the multi-joint choke of expression embodiments of the invention 6.Its structure is the inside that 2 one-piece type coils 711,712 of terminal is vertical configuration and is embedded in magnetic 713.In addition, in these figure, represent the direction in magnetic field, represent sense of current with solid line arrow arrow with dotted arrow.

The structure of the multi-joint choke of structure is shown in Figure 33 A, and each coil portion 715,716 of 2 one-piece type coils 711,712 of terminal is vertical configuration, thus and the direction in the magnetic field of electric current in terminal flows into the coil that is produced when electric current is flow through identical.This structure is positive coupling structure.Adopt this structure,, thereby can increase inductance value, can realize the miniaturization of multi-joint choke because of the stack of each magnetic flux because the flow direction that is produced is identical.

In addition, 3 or the above one-piece type coil of terminal also can carry out same configuration, as long as thereby make that the magnetic direction of electric current in terminal flows into the coil that is produced when electric current is flow through is identical then can to obtain identical effect.

The structure of the multi-joint choke of structure is shown in Figure 33 B, and 2 one-piece type coils 711,712 of terminal are vertical configuration equally, thereby and the magnetic direction of electric current in terminal flows into the coil that is produced when electric current is flow through respectively oppositely.This structure is negative coupling structure.Adopt this structure, owing to the magnetic flux that is produced is cancelled each other, thereby it is saturated to suppress magnetic flux, and the DC stacked spy that can improve multi-joint choke adds.

In addition, 3 or the above one-piece type coil of terminal also can carry out same configuration, thereby as long as the direction in the magnetic field of electric current in terminal flows into the coil that is produced when electric current is flow through is similarly different direction mutually, then can obtain same effect.

Below, the positive coupling structure like this and the multi-joint choke of negative coupling structure illustrate the relation apart from S and inductance value L between the central point of coil of 2 one-piece type coils 711,712 of terminal.Figure 34 is the graph of a relation apart from S and inductance value L between central point.This result tries to achieve according to following imposing a condition, that is: the one-piece type coil 711,712 of terminal is of a size of internal diameter 4.2mm, external diameter 7.9mm, height 1.7mm; The number of turns is 3 circles; In addition, the permeability of the magnetic core that is made of magnetic 713 is μ=26, and magnetic core is of a size of length * wide * height=10mm * 10mm * 3.5mm.Inductance value L is L=0.595 μ H.

Between central point be S=3.5mm apart from S the time, the inductance value L of the multi-joint choke of positive coupling structure is L=0.747 μ H, the inductance value L of the multi-joint choke of negative coupling structure is littler by 24.9% than the occasion of positive coupling structure, its value L=0.560 μ H.

Equally, between central point be S=2.7mm apart from S the time, the inductance value L of the multi-joint choke of positive coupling structure is L=0.794 μ H, the inductance value L of the multi-joint choke of negative coupling structure is littler by 41.1% than the occasion of positive coupling structure, its value L=0.468 μ H.

According to above found that, as long as the distance between central point is identical, the multi-joint choke of positive coupling structure has bigger inductance value L than the multi-joint choke of negative coupling structure.

On the other hand, when in positive coupling structure, making changing between central point apart from S, for example, and when S is 3.5mm, L=0.747 μ H; When S is 2.7mm, L=0.794 μ H.That is the inductance value L when the inductance value L when, S is 2.7mm is 3.5mm than S is big by 6.3%.Equally, when in negative coupling structure, making changing between central point apart from S, for example, L=0.560 μ H when S is 3.5mm, L=0.468 μ H when S is 2.7mm.That is the inductance value L when the inductance value L when, S is 2.7mm is 3.5mm than S is little by 16.5%.

According to above result as can be known, under the situation of positive coupling structure, if dwindle disposing each coil apart from S ground and then can increasing inductance value of central point.In addition, under the situation of negative coupling structure, if each coil of distance ground configuration that dwindles between central point then can reduce inductance value.Therefore, also can be even do not change the number of turns of the one-piece type coil 711,712 of terminal by adjusting the inductance value L that sets multi-joint choke apart from S to a certain extent arbitrarily between central point.

In addition, though described above is the situation of 2 one-piece type coils 711,712 of terminal, but using under the situation of 3 or the above one-piece type coil of terminal, as long as adjust distance between central point respectively, just can change the inductance value of multi-joint choke with comparalive ease similarly.

Figure 35 is the profile of variation of the multi-joint choke of expression present embodiment.The multi-joint choke of this variation is to be illustrated in the one-piece type coil configuration of terminal is become in the multi-joint choke of positive coupling and negative coupling, the number of turns be (N+0.5, and N be 1 or above natural number) profile of configuration structure of the one-piece type coil 721,722 of terminal of circle.In addition, the one-piece type coil 721,722 of terminal is vertical stacked arrangement and is embedded in the magnetic 723.Among Figure 35, the number of turns of the one-piece type coil 721,722 of terminal is respectively 2.5 circles.2.5 of coil 722 is enclosed 2 circles that are stacked in coil 721, promptly on the part of right side.In addition, 2 of coil 722 is enclosed 2.5 circles that are stacked in coil 721, promptly on the left part.Adopt this structure, because wasting space neither, band wound coil to high-density again, thereby can realize that volume is little, the multi-joint choke of highly low structure.

Below, the direction of exposing of the configuration of this multi-joint choke of present embodiment and input terminal and lead-out terminal is described.

Figure 36 A is the perspective elevation of structure of the inside of the expression magnetic 730 that the one-piece type coil 732 of terminal shown in the one-piece type coil 731 of the terminal shown in Figure 36 B and Figure 36 C vertically is configured in rectangular shape.In addition, Figure 36 D is its wiring diagram.The number of turns of 2 coils 731,732 is respectively 1.5 circles, has separately input terminal 733,735 and lead-out terminal separately 734,736.

As indicated in Figure 36 A, the input terminal 733 of coil 731 and the input terminal 735 of coil 732 be from identical showing out, the lead-out terminal 734 of coil 731 and the lead-out terminal 736 of coil 732 from above-mentioned relative showing out.

Adopt this configuration, because input terminal 733,735 and lead-out terminal 734,736 can be showed out from same respectively, thereby, when being installed to multi-joint choke on the printed circuit board (PCB), become easily with the configuration in the process of forming circuits such as semiconductor integrated circuit, can improve packing density.

In addition, can also at input side mark " IN " be set at an easy rate, mark " OUT " etc. be set at outlet side.In addition, in this variation,,, the number of turns also can obtain same effect even being 2.5 circles, 3.5 circles etc. though the number of turns of 2 coils 731,732 is made 1.5 circles.

In addition, all input terminals or lead-out terminal also need not be showed out from one, also input terminal and lead-out terminal at least 2 can be showed out from 1.In addition, when all input terminal and lead-out terminal are from same showing out, input terminal and lead-out terminal alternately can be exposed.

In addition, Figure 37 A is the perspective elevation of the multi-joint choke that is made of another kind of structure.The structure of this multi-joint choke is that the one-piece type coil 742 of terminal shown in the one-piece type coil 741 of the terminal shown in Figure 37 B and Figure 37 C is vertical configuration.And Figure 37 D is its wiring diagram.Under the situation of this multi-joint choke, its structure is, the input terminal 743 and the lead-out terminal 744 of a coil 741 are showed out from the same of magnetic 740, and the input terminal 745 of another coil 742 and lead-out terminal 746 from above-mentioned relative showing out.

In this structure, coil also is not limited to 2, equally also can be with 3 or above winding stack.

Figure 38 A is the perspective elevation of the multi-joint choke that is made of another structure.The structure of this multi-joint choke is that the one-piece type coil 752 of terminal shown in the one-piece type coil 751 of the terminal shown in Figure 38 B and Figure 38 C is vertical configuration.And Figure 38 D is its wiring diagram.The number of turns of the coil 751,752 of this multi-joint choke is respectively 1.5 circles and is embedded in the inside of magnetic 750 and forms the wire structures shown in Figure 38 D.That is, coil 751 has input terminal 755 and lead-out terminal 756, and coil 752 has input terminal 753 and lead-out terminal 754.The configuration of coil 751 and coil 752 makes separately input terminal 753,755 and separately lead-out terminal 754,756 respectively in different showing out.

Adopt this structure, also be difficult to make between terminal be in contact with one another even increase the area of input terminal and lead-out terminal.Therefore, can also improve more on printed circuit board (PCB) and install and heat dispersion, can also further reduce resistance value, thereby can make the multi-joint choke that is applicable to big electric current.

In addition, if adopt this structure,, thereby can increase installation strength because the solder position of terminal disperseed equably.

The coil of the multi-joint choke of this structure is not limited to 2, can 3 or above coil is similarly overlapping.At this moment, a plurality of terminals also can be configured in identical showing out.

In addition, be illustrated, both can carry out chamfering, the mark of expression input terminal and lead-out terminal also can be set on the top of magnetic in order to be easy to take one's bearings though magnetic is example with the rectangular shape.

As mentioned above, when the multi-joint choke of present embodiment can be guaranteed the needed inductance value of high band, also can keep little dc resistance, and applicable to big electric current and realize miniaturization.Therefore, when using it for the power circuit illustrated in fig. 6 of embodiment 1, can make small-sized, high performance power circuit.When in the electronic equipment that this power circuit is loaded into personal computer and mobile phone and so on, help realizing miniaturization.

Embodiment 7

Below, with reference to Figure 39-Figure 41 the multi-joint choke of embodiments of the invention 7 is described.The illustrated multi-joint choke of the basic structure of the multi-joint choke of present embodiment and embodiment 1-embodiment 6 is identical.In addition, Figure 39-Figure 41 represents the face shaping of multi-joint choke, has only represented the input terminal and the lead-out terminal of the one-piece type coil of terminal among the figure.

The architectural feature of multi-joint choke shown in Figure 39 is, all input terminals 151 all expose from the one side of the magnetic 7 of rectangular shape, and lead-out terminal (not shown) all from relative the showing out of above-mentioned that face.Therefore, when being installed to multi-joint choke on the printed circuit board (PCB), can improve the packing density of printed circuit board (PCB) with multi-joint choke near configurations such as semiconductor integrated circuit.In addition, the mark part 121 that utilizes printing to wait expression can also be set on the upper face of magnetic 7, for example: as the mark IN-1, the IN-2 that represent input terminal 151, IN-3 etc.; As the mark OUT-1, the OUT-2 that represent lead-out terminal, OUT-3 etc.Like this, when being installed to multi-joint choke on the printed circuit board (PCB) or after installing, can easily confirm whether correctly install.

In addition, also can make the structure that input terminal and two kinds of terminals of lead-out terminal are all exposed from one side.For example, as shown in figure 40, input terminal 161 and lead-out terminal 162 alternately can be disposed and expose.At this moment, on the upper face of magnetic 7, with the corresponding respectively position of input terminal and lead-out terminal on the mark part 121 that utilizes printing to wait expression is set, for example, as the mark IN-1, the IN-2 that represent input terminal 161, IN-3 etc.; As the mark OUT-1, the OUT-2 that represent lead-out terminal 162, OUT-3 etc.Like this, can both easily carry out the whether correctly affirmation of installation in the time of on multi-joint choke being installed to printed circuit board (PCB) for example and after installing.

In addition, needn't be non-all input terminals 161 and lead-out terminal 162 be all exposed from one side, can from 2 or above input terminal and lead-out terminal, select at least 2 terminals to expose from one side.

In addition, the number of turns is under the situation of the one-piece type coil of terminal that constitutes of N circle (N be 1 or above natural number), because input terminal and lead-out terminal are made equidirectional outstanding structure up and down, thereby, can input terminal and lead-out terminal be configured in side by side the one side of magnetic with this state upper and lower settings.

Have, the configuration of coil also can make at least 2 terminals expose to different directions respectively again.For example, the structure of multi-joint choke shown in Figure 41 is, 3 lead-out terminals 172 are respectively from different showing out, and 3 input terminals 171 are all showed out from same.In addition, occasion at this multi-joint choke, on the upper face of magnetic 7, utilize printing to wait the mark part of representing 121 also being provided with the corresponding respectively position of input terminal and lead-out terminal, for example, as the mark IN-1, the IN-2 that represent input terminal 171, IN-3 etc., as the mark OUT-1, the OUT-2 that represent lead-out terminal 172, OUT-3 etc.Like this, in the time of on multi-joint choke being installed to for example printed circuit board (PCB) and after installing, the affirmation that can easily whether correctly install.

Though said structure is illustrated the situation of using 3 one-piece type coils of terminal, the number of the one-piece type coil of terminal is not particularly limited, in addition to terminal draw also indefinite of direction, as long as expose drawing on corresponding of the direction with terminal.

Like this, under the situation that disposes the one-piece type coil of terminal that exposes terminal from arbitrary face, can increase the distance between terminal.Thereby can increase the terminal area, thereby can further improve heat dissipation characteristics.In addition, owing to can also reduce the resistance value of terminal, thereby can make the multi-joint choke that is applicable to big electric current.In addition, by adopting this structure, because the solder of terminal partly is dispersed in bottom surface and peripheral part thereof, thereby, also can improve with respect to installation strength from the power of all directions.In addition,,, both can carry out chamfering, also can further mark part be set at each terminal place to a part of seamed edge in order to be easy to take one's bearings though in the present embodiment magnetic is made rectangular shape.

The structure of multi-joint choke of the present invention is, employing is corroded metal plate or punching press etc. forms the punching press flat board, again the one-piece type coil of terminal is made in the dull and stereotyped bending of punching press, the one-piece type coil of a plurality of this terminals has certain position relation and is embedded in the inside of magnetic; Because it can use at high band, and can guarantee needed inductance value and little dc resistance, thereby, field of portable devices such as various electronic equipments, particularly mobile phone be applicable to.

Claims (35)

1. a multi-joint choke is characterized in that, comprising: have the position relation of setting and the coil groups of the one-piece type coil of a plurality of terminals of configuration and above-mentioned coil groups is embedded in the magnetic of magnetic inside; The metal plate that the one-piece type coil of above-mentioned terminal is made of predefined expansion shape is through being bent to form.

2. multi-joint choke according to claim 1, it is characterized in that, being configured to of above-mentioned coil groups: the central shaft of a plurality of above-mentioned coils that constitute above-mentioned coil groups is parallel to each other thereby above-mentioned coil is arranged side by side, simultaneously, the central point of at least one coil of selecting from a plurality of above-mentioned coils is different with the height of the central point of above-mentioned selected coil coil in addition.

3. multi-joint choke according to claim 2, it is characterized in that the inductance value that the distance between the central point of at least one coil of selecting central point by changing at least one coil select from above-mentioned coil groups and a plurality of above-mentioned coil beyond above-mentioned selected coil obtains stipulating.

4. multi-joint choke according to claim 2, it is characterized in that the inductance value that the height and position between the central point of at least one coil of selecting central point by changing at least one coil select from above-mentioned coil groups and a plurality of above-mentioned coil beyond above-mentioned selected coil obtains stipulating.

5. multi-joint choke according to claim 2, it is characterized in that, at least one coil that to select from above-mentioned coil groups becomes V font or inverted v-shaped with two coil configuration adjacent with above-mentioned selected coil, thereby flow direction and the electric current in the above-mentioned coil of passing that is produced when making electric current flow through above-mentioned selected coil flows through the above-mentioned flow direction that passes in the above-mentioned coil that is produced when being configured in two coils adjacent with above-mentioned selected coil and be mutual different direction.

6. multi-joint choke according to claim 2, it is characterized in that, at least one coil that to select from above-mentioned coil groups becomes V font or inverted v-shaped with two coil configuration adjacent with above-mentioned selected coil, is identical direction thereby the flow direction that is produced in coil when making electric current flow through above-mentioned selected coil and electric current flow through the above-mentioned flow direction that is produced in coil when being configured in two coils adjacent with above-mentioned selected coil.

7. multi-joint choke according to claim 2, it is characterized in that, the number of turns that constitutes the above-mentioned coil of above-mentioned coil groups is made of (N+0.5) circle, its structure forms for the N circle part of the coil selected from above-mentioned coil groups with (N+0.5) circle part stacked arrangement of the adjacent coil of above-mentioned selected coil, wherein, N is 1 or above integer.

8. according to claim 5 or 6 described multi-joint chokes, it is characterized in that the inductance value that each distance between the central point of central point by changing above-mentioned selected coil and the coil that is configured in two coils adjacent with above-mentioned selected coil obtains stipulating.

9. multi-joint choke according to claim 1 is characterized in that, the central point of a plurality of above-mentioned coils of the above-mentioned coil groups of the feasible formation of the configuration of above-mentioned coil is in the same plane in the above-mentioned coil groups.

10. multi-joint choke according to claim 9 is characterized in that, the inductance value that obtains stipulating by the distance between the central point that changes 2 adjacent in a plurality of above-mentioned coils coils.

11. multi-joint choke according to claim 9 is characterized in that, the configuration of above-mentioned coil groups makes that the direction of the magnetic flux in the above-mentioned coil that electric current produced when flowing through each of a plurality of above-mentioned coils is different mutually.

12. multi-joint choke according to claim 9 is characterized in that, the configuration of above-mentioned coil groups makes that the direction of the magnetic flux in the above-mentioned coil that electric current produced when flowing through each of a plurality of above-mentioned coils is an equidirectional.

13. multi-joint choke according to claim 1, it is characterized in that, being configured to of above-mentioned coil groups: the feasible central shaft that constitutes a plurality of above-mentioned coils of above-mentioned coil groups is parallel to each other thereby above-mentioned coil is arranged side by side, simultaneously, make at least one coil of from a plurality of above-mentioned coils, selecting central point and and the central point of the adjacent coil of above-mentioned selected coil between distance be the external diameter of above-mentioned selected coil and above-mentioned adjacent coil the external diameter sum 1/2 or below, at least 1 circle and above-mentioned adjacent coil interlock of above-mentioned selected coil.

14. multi-joint choke according to claim 13, it is characterized in that the number of turns of above-mentioned selected coil and above-mentioned adjacent coil is made of the N circle, its configuration makes (N-1) circle and above-mentioned adjacent coil interlock of above-mentioned selected coil, wherein, N is 2 or above integer.

15. multi-joint choke according to claim 13, it is characterized in that, the configuration of above-mentioned coil groups makes that the difference of the external diameter of difference and above-mentioned adjacent coil of the external diameter of above-mentioned selected coil and internal diameter and internal diameter is identical, the internal diameter sum of the distance between the central point of the central point of above-mentioned selected coil and above-mentioned adjacent coil and the external diameter of above-mentioned selected coil and above-mentioned adjacent coil 1/2 consistent.

16. multi-joint choke according to claim 13, it is characterized in that, the central point by changing selected at least one coil in above-mentioned coil groups and and the central point of the adjacent coil of above-mentioned selected coil between the distance inductance value that obtains stipulating.

17. multi-joint choke according to claim 13, it is characterized in that the configuration of above-mentioned coil groups makes that the direction of the magnetic flux in coil the when direction of the magnetic flux in coil when electric current flows through in above-mentioned coil groups selected at least one coil and electric current flow through coil with above-mentioned selected coil institute adjacency is equidirectional.

18. multi-joint choke according to claim 13, it is characterized in that the configuration of above-mentioned coil groups makes that the direction of the magnetic flux in coil the when direction of the magnetic flux in coil when electric current flows through in above-mentioned coil groups selected at least one coil and electric current flow through coil with above-mentioned selected coil institute adjacency is a different directions.

19., it is characterized in that a plurality of above-mentioned coil of above-mentioned coil groups all disposes point-blank according to claim 9 or 13 described multi-joint chokes.

20., it is characterized in that at least one coil configuration of selecting is on the position of staggering with point-blank a plurality of other coils of configuration according to claim 1,2,9 or 13 described multi-joint chokes from a plurality of above-mentioned coils.

21., it is characterized in that the configuration of above-mentioned coil groups makes selected 2 or above input terminal expose on identical surface with at least one side in the lead-out terminal according to claim 1,2,9 or 13 described multi-joint chokes.

22. multi-joint choke according to claim 1 is characterized in that, in the above-mentioned coil groups, a plurality of above-mentioned coil that constitutes above-mentioned coil groups vertically is embedded in the inside of above-mentioned magnetic.

23. multi-joint choke according to claim 22 is characterized in that, the inductance value that obtains stipulating by the interval that changes between a plurality of above-mentioned coils.

24. multi-joint choke according to claim 22 is characterized in that, the configuration of above-mentioned coil groups makes that the direction of the magnetic flux in the above-mentioned coil that electric current produced when flowing through a plurality of above-mentioned coil is equidirectional.

25. multi-joint choke according to claim 22 is characterized in that, the configuration of above-mentioned coil groups makes that the direction of the magnetic flux in the above-mentioned coil that electric current produced when flowing through a plurality of above-mentioned coil is mutual different directions.

26. multi-joint choke according to claim 22, it is characterized in that the number of turns of a plurality of above-mentioned coils is made of (N+0.5) circle, its structure is that the 0.5 circle part that is positioned at each coil up and down is configured in the same plane, wherein, N is 1 or above integer.

27. multi-joint choke according to claim 22 is characterized in that, all input terminals of a plurality of above-mentioned coils and at least one side of lead-out terminal are exposed on identical plane.

28. according to claim 1,2,9,13 or 22 described multi-joint chokes, it is characterized in that, above-mentioned magnetic is by ferrite magnetic body, at least a formation of selecting in the complex of the complex of ferrimagnetism powder and insulative resin and metal magnetic powder and insulative resin.

29. according to claim 1,2,9,13 or 22 described multi-joint chokes, it is characterized in that, form dielectric film on the surface of above-mentioned coil.

30., it is characterized in that above-mentioned coil groups has 2 terminals at least from showing out of having nothing in common with each other according to claim 1,2,9,13 or 22 described multi-joint chokes.

31., it is characterized in that at least one terminal of above-mentioned coil groups is through the bottom surface and at least 2 faces of face on every side and exposing according to claim 1,2,9,13 or 22 described multi-joint chokes.

32. according to claim 1,2,9,13 or 22 described multi-joint chokes, it is characterized in that, in the above-mentioned coil groups, expose at least and have by nickel (Ni) in the terminal part on surface or comprise the substrate layer that the layer of nickel (Ni) constitutes, its superiors form solder layer or tin (Sn) layer.

33. according to claim 1,2,9,13 or 22 described multi-joint chokes, it is characterized in that, at least one side's of expression input terminal and lead-out terminal labeling section be set on the above-mentioned magnetic.

34., it is characterized in that above-mentioned magnetic forms rectangular shape according to claim 1,2,9,13 or 22 described multi-joint chokes.

35. an electronic equipment is characterized in that, is mounted with claim 1,2,9,13 or 22 described multi-joint chokes.

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