CN102682953A - Common mode filter - Google Patents
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- CN102682953A CN102682953A CN2012101685878A CN201210168587A CN102682953A CN 102682953 A CN102682953 A CN 102682953A CN 2012101685878 A CN2012101685878 A CN 2012101685878A CN 201210168587 A CN201210168587 A CN 201210168587A CN 102682953 A CN102682953 A CN 102682953A
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Abstract
The invention discloses a common mode filter. The common mode filter comprises an upper base plate, an upper coil guide layer, a magnetic core base plate layer, a lower coil guide layer, a lower base plate, a first coil and a second coil which are stacked from top to bottom. Through the arrangement of through holes in both base plates to match with the winding of the two coils, the winding turns of the two coils are spiral spatially. A magnetic core is arranged on the magnetic core base plate layer in the format of a closed pattern. In a perspective view of the common mode filter from top to bottom, the closed pattern passes through the spiral lines of the first and second coils. Through the special winding of the coils together with the arrangement format of closed pattern of the magnetic core, the differential mode inductance can be reduced to the largest extent. The lines of magnetic forces generated when the two coils are respectively conducted are centralized in the magnetic core of a closed magnetic circuit inside the common mode filter, so magnetic leakage is reduced. Meanwhile, the common mode filter can have big common mode impedance without being wound with a large number of turns of coils.
Description
Technical field
The present invention relates to common-mode filter, particularly relate to a kind of terrace common-mode filter that comprises sandwich construction.
Background technology
The decomposition texture sketch map of existing laminated type common-mode filter is as shown in Figure 1; Comprise upper substrate 7, infrabasal plate 6 and the lattice coil guide layer that is provided with in the centre; Usually, first coil is along the terminal k → h of silk-screen figure on terminal f → n → the 5th coil guide layer 5 of silk-screen figure on terminal p → d → the 4th coil guide layer 4 of silk-screen figure on the terminal b → r → tertiary coil guide layer 3 of silk-screen figure on the terminal u → terminal a → second coil guide layer 2 of silk-screen figure on the first coil guide layer 1.Second coil is along the terminal i → j of silk-screen figure on terminal m → g → the 5th coil guide layer 5 of silk-screen figure on terminal e → o → the 4th coil guide layer 4 of silk-screen figure on the terminal q → c → tertiary coil guide layer 3 of silk-screen figure on the terminal t → s → second coil guide layer 2 of silk-screen figure on the first coil guide layer 1.When the laminated type common-mode filter of said structure, the material selection dielectric ceramic material of each layer body, be laminated type dielectric ceramic common-mode filter; During the material selection Ferrite Material of each layer body, be laminated type ferrite common-mode filter.For first kind of common-mode filter, laminated type dielectric ceramic common-mode filter is a dielectric ceramic material because it adopts; Dielectric ceramic material relative permeability low (approximating 1); It will obtain bigger common code impedance, just needs the more wire circle of coiling, promptly more coil guide layer; Cause complex process like this, the silver slurry consumes bigger.For second kind of common-mode filter; Laminated type ferrite common-mode filter; Because what it adopted is the Ferrite Material of high magnetic permeability, so it with respect to first kind of common-mode filter, does not need the more wire circle of coiling just can reach relatively large common code impedance; But it is serious that the deficiency of second kind of common-mode filter is exactly a leakage field; Common-mode filter Insertion Loss under the differential mode state is bigger, and the Ferrite Material relative dielectric constant causes between coil stray capacitance bigger than conference, thereby causes under the product differential mode state lower from humorous frequency.
Summary of the invention
Technical problem to be solved by this invention is: remedy the deficiency of above-mentioned prior art, propose a kind of common-mode filter, can not need the more wire circle of coiling just can obtain bigger common code impedance, the differential mode impedance can be low as much as possible, and leakage field is reduced.
Technical problem of the present invention solves through following technical scheme:
A kind of common-mode filter comprises the upper substrate (17) of lamination setting from top to bottom, last coil guide layer (16), magnetic core substrate layer (14), lower coil guide layer (12), infrabasal plate (11), first coil (21) and second coil (22); Be respectively arranged with through hole on a plurality of same positions of said upward coil guide layer (16), magnetic core substrate layer (14), lower coil guide layer (12); The said through hole of going up on coil guide layer (16), magnetic core substrate layer (14), the above same position of lower coil guide layer (12) form respectively a1 sets of vias corresponding to said first coil (21), a2 sets of vias ..., an sets of vias and corresponding to the b1 sets of vias of said second coil (22), b2 sets of vias ..., the bn sets of vias; Said first coil (21) pass from top to bottom successively said a1 sets of vias, from the bottom up pass said a2 sets of vias, from top to bottom pass said a3 sets of vias ..., pass said an sets of vias along the p direction; When n was odd number, the p direction was for from top to bottom; When n was even number, the p direction was for from the bottom up; The relative position of each said sets of vias setting makes said first coil (21) in said common-mode filter perspective view from top to bottom, be helix shape; Said second coil (22) pass from top to bottom successively said b1 sets of vias, from the bottom up pass said b2 sets of vias, from top to bottom pass said b3 sets of vias ..., pass said bn sets of vias along the p direction; When n was odd number, the p direction was for from top to bottom; When n was even number, the p direction was for from the bottom up; The relative position that is provided with of each said sets of vias makes said second coil (22) in said common-mode filter perspective view from top to bottom, be helix shape, and makes that the helix of said second coil (22) equates with the helix width of said first coil (21), the hand of spiral is relative; Said magnetic core substrate layer (14) comprises at least one laminar substrate; On the said substrate of each layer magnetic core is set all; Said magnetic core is along the closed figures setting; In said common-mode filter perspective view from top to bottom, said closed figures is passed the helix of said first coil (21) and the helix of said second coil (22).
Technical problem of the present invention solves through following further technical scheme:
A kind of common-mode filter comprises the upper substrate (17) of lamination setting from top to bottom, last coil guide layer (16), magnetic core substrate layer (14), lower coil guide layer (12), infrabasal plate (11), first coil (21) and second coil (22); Be respectively arranged with through hole on a plurality of same positions of said upward coil guide layer (16), magnetic core substrate layer (14), lower coil guide layer (12); The said through hole of going up on coil guide layer (16), magnetic core substrate layer (14), the above same position of lower coil guide layer (12) form respectively a1 sets of vias corresponding to said first coil (21), a2 sets of vias ..., an sets of vias and corresponding to the b1 sets of vias of said second coil (22), b2 sets of vias ..., the bn sets of vias; Said first coil (21) pass from the bottom up successively said a1 sets of vias, from top to bottom pass said a2 sets of vias, from the bottom up pass said a3 sets of vias ..., pass said an sets of vias along the p1 direction; When n was odd number, the p1 direction was for from the bottom up; When n was even number, the p1 direction was for from top to bottom; The relative position of each said sets of vias setting makes said first coil (21) in said common-mode filter perspective view from top to bottom, be helix shape; Said second coil (22) pass from the bottom up successively said b1 sets of vias, from top to bottom pass said b2 sets of vias, from the bottom up pass said b3 sets of vias ..., pass said bn sets of vias along the p1 direction; When n was odd number, the p1 direction was for from the bottom up; When n was even number, the p1 direction was for from top to bottom; The relative position that is provided with of each said sets of vias makes said second coil (22) in said common-mode filter perspective view from top to bottom, be helix shape, and makes that the helix of said second coil (22) equates with the helix width of said first coil (21), the hand of spiral is relative; Said magnetic core substrate layer (14) comprises at least one laminar substrate; On the said substrate of each layer magnetic core is set all; Said magnetic core is along the closed figures setting; In said common-mode filter perspective view from top to bottom, said closed figures is passed the helix of said first coil (21) and the helix of said second coil (22).
The beneficial effect of the present invention and prior art contrast is:
Common-mode filter of the present invention through the coiling that cooperates two coils that is provided with of through hole, makes the form in the shape of a spiral of respectively enclosing spatially of two coil windings, can farthest reduce differential mode inductance.On the magnetic core substrate layer magnetic core is set simultaneously; Magnetic core place closed figures is passed the helix of said first coil and the helix of second coil; Magnetic core promptly passes two coils around circle inner space firmly; The magnetic line of force that produces after such two coils are switched on separately will concentrate in the inner closed magnetic circuit magnetic core of common-mode filter, can reduce leakage field; Simultaneously two coils separately in the inner space that circle is lived because the existence of magnetic core is arranged, so the inner space relative permeability is high, thereby can make common-mode filter need not want the more wire circle of coiling, can reach bigger mode impedance value.Further, the bulk material of each substrate of common-mode filter is selected the ceramic material of low-k for use, and the 3dB that can improve difference mode signal has improved the insulation resistance between coil turn simultaneously by frequency.
Description of drawings
Fig. 1 is the decomposition texture sketch map of laminated type common-mode filter of the prior art;
Fig. 2 is the decomposition texture sketch map of the common-mode filter of the specific embodiment of the invention one;
Fig. 3 is the enlarged diagram of five laminar substrates in the common-mode filter of the specific embodiment of the invention one;
Fig. 4 is the common-mode filter perspective view from top to bottom of the specific embodiment of the invention one;
Fig. 5 be in the common-mode filter of the specific embodiment of the invention one magnetic core by the sketch map of the closed figures coiling of curve;
Fig. 6 be in the common-mode filter of the specific embodiment of the invention one magnetic core by the sketch map of the closed figures coiling of irregular polygon;
Fig. 7 is the current direction sketch map during through common-mode signal in the common-mode filter of the specific embodiment of the invention one;
Fig. 8 is the profile of Fig. 7 along the AA direction;
Fig. 9 is the current direction sketch map during through difference mode signal in the common-mode filter of the specific embodiment of the invention one;
Figure 10 is the profile of Fig. 9 along the AA direction;
Figure 11 is the enlarged diagram of five laminar substrates in the common-mode filter of the specific embodiment of the invention two;
Figure 12 is the common-mode filter perspective view from top to bottom of the specific embodiment of the invention two.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is explained further details.
As shown in Figure 2, be the decomposition texture sketch map of the laminated type common-mode filter in this embodiment.Common-mode filter comprises the upper substrate 17 of lamination setting from top to bottom, last coil guide layer 16, last through hole connectivity layer 15, magnetic core substrate layer 14, lower through-hole connectivity layer 13, lower coil guide layer 12, infrabasal plate 11, the first coil (not shown) and the second coil (not shown).Wherein, magnetic core substrate layer 14 is made up of first substrate 141 and second substrate 142.In all the other execution modes, the magnetic core substrate layer also can be made up of a substrate or more a plurality of substrates.
Wherein, last coil guide layer 16, go up on a plurality of same positions of through hole connectivity layer 15, magnetic core substrate layer 14, lower through-hole connectivity layer 13 and lower coil guide layer 12 and be respectively arranged with through hole.Through hole on last coil guide layer 16, magnetic core substrate layer 14, the lower coil guide layer 12 on the same position form respectively the one one sets of vias corresponding to first coil 21, the one or two sets of vias ..., a n sets of vias and corresponding to the 21 sets of vias of second coil 22, the two or two sets of vias ..., the 2nd n sets of vias.Specifically, as shown in Figure 3, can know that from the enlarged diagram of above-mentioned each layer structure corresponding to same position, a through hole is set all on each laminar substrate, these a plurality of through holes are formed sets of vias.As corresponding to the first coil winding path, to the X position of each laminar substrate, above-mentioned each layer is provided with through hole 16a1,15a1,141a1,142a1,13a1 and 12a1 respectively, and these a plurality of through holes are formed first sets of vias; To the Y position of each laminar substrate, above-mentioned each layer is provided with through hole 16a2,15a2,141a2,142a2,13a2 and 12a2 respectively, and these a plurality of through holes are formed second sets of vias.Corresponding to the second coil winding path, to the W position of each laminar substrate, above-mentioned each layer is provided with through hole 16b1,15b1,141b1,142b1,13b1 and 12b1 respectively, and these a plurality of through holes are formed first sets of vias; To the Z position of each laminar substrate, above-mentioned each layer is provided with through hole 16b2,15b2,141b2,142b2,13b2 and 12b2 respectively, and these a plurality of through holes are formed second sets of vias.For distinguishing first sets of vias that first sets of vias that first coil passes through and second coil pass through; Therefore first sets of vias of first coil being passed through is being defined as the a1 sets of vias; First sets of vias that second coil is passed through is being defined as the b1 sets of vias; For second sets of vias, third through-hole group ..., the n sets of vias definition, promptly follow-up to be through the sets of vias of first coil a1, a2, a3 ..., an sets of vias; Follow-up to be through the sets of vias of second coil b1, b2, b3 ..., the bn sets of vias.
After on each laminar substrate above-mentioned sets of vias being set, each coil carries out coiling by the mode of being described below:
As shown in Figure 3; First coil is along beginning to pass from top to bottom successively a1 sets of vias (promptly passing through hole 16a1,15a1,141a1,142a1,13a1 and 12a1 successively) from going up the coil guide layer shown in the arrow; After arriving through hole 12a1; Pass bottom arrival through hole 12a2 from through hole 12a1 along lower coil guide layer 12; Then after pass a2 sets of vias (promptly passing through hole 12a2,13a2,142a2,141a2,15a2 and 16a2 successively) shown in the arrow from the bottom up, arrive through hole 16a2, along passing the a3 sets of vias shown in the arrow from top to bottom, and the like ... When arriving an sets of vias, along from top to bottom or direction from the bottom up pass an sets of vias.The concrete direction of passing an sets of vias is by the through hole number decision that is provided with, and promptly by the n decision, when n was odd number, first coil finally passed from lower coil guide layer 12, and the direction of therefore passing an sets of vias is for from top to bottom; When n is even number, first coil will be got back to coil guide layer 16 and pass, and the direction of therefore passing an sets of vias is for from the bottom up.First coil passes through hole according to aforesaid way, and promptly by the relative position decision of each sets of vias, the relative position that is provided with of each sets of vias makes the coil of winning in common-mode filter perspective view from top to bottom, be helix shape to its final coiling form.As shown in Figure 4, in this embodiment, common-mode filter perspective view from top to bottom.Can know in conjunction with Fig. 3 and Fig. 4; The relative position of each sets of vias is communicated with through broken line among Fig. 3; Therefore among Fig. 4 during perspective view; First coil 21 is the helix form, and real segment 211,212 and 213 is the part that corresponding first coil passes through from last coil guide layer 16, and phantom line segments 214,215 and 216 is the part that corresponding first coil passes through from lower coil guide layer 12.
The coiling mode of second coil is similar with first coil; Promptly second coil pass from top to bottom successively said b1 sets of vias (promptly passing through hole 16b1,15b1,141b1,142b1,13b1 and 12b1 successively), from the bottom up pass said b2 sets of vias (promptly passing through hole 12b2,13b2,142b2,141b2,15b2 and 16b2 successively), from top to bottom pass said b3 sets of vias ..., pass said bn sets of vias along the p direction; When n was odd number, the p direction was for from top to bottom; When n was even number, the p direction was for from the bottom up.In this embodiment; B1, b2 ..., in the bn sets of vias; The relative position that is provided with of each sets of vias makes said second coil in common-mode filter perspective view from top to bottom, be helix shape, and makes that the helix of said second coil 22 equates with the helix width of said first coil 21, the hand of spiral is relative.Still combine Fig. 3 and shown in Figure 4, b1 among Fig. 3, b2 ..., the relative position of each sets of vias also is to be communicated with through broken line in the bn sets of vias, so among Fig. 4 during perspective view, second coil 22 is the helix form.Pass through the setting of sets of vias position simultaneously; Make the helix width d2 of second coil 22 among Fig. 4 equal the helix width d1 of first coil 21, and the hand of spiral of the helix of second coil 22 (being depicted as the right side from figure to a left side like arrow s2 among the figure) is relative with the hand of spiral of the helix of first coil 21 (being depicted as a left side from figure to right like arrow s1 among the figure).
On first substrate 141 of composition magnetic core substrate layer 14 and second substrate 142 magnetic core 1410 and 1420 are set respectively in this embodiment; Magnetic core 1410 and 1420 is along the closed figures setting; In common-mode filter perspective view from top to bottom, closed figures is passed the helix of first coil and the helix of second coil.Can know that from Fig. 4 perspective view the closed figures of magnetic core is a rectangle in this embodiment, the helix of first coil 21 is passed on a long limit of rectangle, and the helix of second coil 22 is passed on another long limit.Certainly, the closed figures that magnetic core is provided with can also be curve as shown in Figure 5 or irregular polygon as shown in Figure 6, as long as closed figures is passed the helix of first coil 21 and the helix of second coil 22.
The course of work of the common-mode filter of this embodiment is following:
As shown in Figure 7, be the current direction sketch map when the common-mode signal in the common-mode filter.Fig. 8 is the profile (two figures only illustrate ratio scale also not quite identical) of Fig. 7 along the AA direction.When common-mode signal is passed through; In first coil 21 in the sense of current and second coil 22 sense of current consistent; According to Ampere's right-handed screw rule, the direction of the magnetic line of force that produces behind each coil electricity in closed magnetic core 1410 or 1420 is consistent, the magnetic flux mutual superposition of passing through in the magnetic core.And according to inductance value L=N Φ/I (N is a coil turn, and Φ is through the magnetic flux of magnetic core, and I is an electric current), so the inductance quantitative change is big, thus make common-mode signal be not easy through, play the effect that suppresses common-mode noise.In this embodiment; The magnetic core substrate layer also is set in the common-mode filter, and the closed figures of magnetic core is passed the helix of first coil 21 and the helix of second coil 22, and therefore two coils enclose separately in the part that centers on and have magnetic core to pass through; And the magnetic core relative permeability is higher; The coil turn inner space relative permeability of living is just high like this, and common-mode filter need not wanted the more wire circle of coiling, can reach bigger mode impedance value.
As shown in Figure 9, be the current direction sketch map when the difference mode signal in the common-mode filter.Figure 10 is the profile (two figures only illustrate ratio scale also not quite identical) of Fig. 9 along the AA direction.When the differential mode signal passes through; Current opposite in direction in the sense of current and second coil 22 in first coil 21; According to Ampere's right-handed screw rule; The direction of the magnetic line of force that produces behind each coil electricity in closed magnetic core 1410 or 1420 is also opposite, and the magnetic flux that passes through in the magnetic core is cancelled each other, so inductance value reduces.And two corresponding sets of vias numbers of coil are provided with identical on the common-mode filter; Therefore the number of turns of two coil windings equates; Identical on two coil profiles around space segment width d1, d2; Thickness h is the distance of coil guide layer 16 to lower coil guide layer 12, and also promptly two coils are also identical around the area of part, so the magnetic flux that passes through in the magnetic core can be offset to the full extent.Mode with respect to coiling in the prior art; Owing to the intrinsic reason in exit position; Cause the number of turns of two coils always to differ 1/2 circle, and the coiling mode of this embodiment coil can make two wire circles equate, make the magnetic flux that passes through in the magnetic core to offset to the full extent; Thereby farthest reduce differential mode inductance, difference mode signal passes through with alap loss.
Common-mode filter in this embodiment is provided with through hole through particular form, cooperates the special coiling of coil, makes coil coiling in a spiral manner, make effectively to suppress common-mode signal, and difference mode signal passes through with lower loss to greatest extent.The magnetic core substrate layer also is set in the common-mode filter; The closed figures of magnetic core is passed the helix of first coil 21 and the helix of second coil 22; The magnetic line of force that so promptly makes coil produce can concentrate in the inner embedding closed magnetic circuit magnetic core of common-mode filter; With respect to laminated type ferrite common-mode filter of the prior art, can reduce leakage field.With respect to laminated type dielectric ceramic common-mode filter of the prior art, common-mode filter need not wanted the more wire circle of coiling, can reach bigger mode impedance value simultaneously.When being identical mode impedance value, the common-mode filter in this embodiment, the number of turns of interior electrode coil is less, and the noble metal slurry of required consumption is also less, and the element cost is lower.
According to above-mentioned analysis; Comprise through hole connectivity layer 15 and lower through-hole connectivity layer 13 in this embodiment in the common-mode filter; Being provided with that this is two-layer can increase the distance that goes up coil guide layer 16 to lower coil guide layer 12, promptly increases the height of coil around space segment.When selecting for use in the magnetic core substrate layer 14 than multilayer, also can save through hole connectivity layer 15 and lower through-hole connectivity layer 13, only form common-mode filter by upper substrate 17, last coil guide layer 16, magnetic core substrate layer 14, lower coil guide layer 12, infrabasal plate 11.The common-mode filter of forming can reach the minimizing leakage field equally, and does not need the more wire circle of coiling just can obtain the effect of bigger common code impedance.
Further; The bulk material of upper substrate 17, last coil guide layer 16, magnetic core substrate layer 14, lower coil guide layer 12, infrabasal plate 11 is selected the ceramic material of low-k for use in the common-mode filter; Dielectric constant is between 4-30; Advanced low-k materials can improve the 3dB cut-off frequency of difference mode signal, improves the insulation resistance between coil turn simultaneously.And magnetic core can be selected the big as far as possible core material of relative permeability μ for use; Like the core material of 2＜μ＜200, Ferrite Material etc., the magnetic core relative permeability is big more; Then coil turn lives to center on just height of part relative permeability, and the coil of coiling same number of turns can obtain big mode impedance value.
Embodiment two
This embodiment is with the difference of execution mode one: in this embodiment, begin coiling during each coil winding from the bottom up.In the embodiment one, be coiling mode from top to bottom.
Common-mode filter in this embodiment is identical with the composition of embodiment one, comprises the upper substrate of lamination setting from top to bottom, last coil guide layer, last through hole connectivity layer, magnetic core substrate layer, lower through-hole connectivity layer, lower coil guide layer, infrabasal plate, first coil and second coil.Wherein, the magnetic core substrate layer also is made up of first substrate and second substrate.
Wherein, be respectively arranged with through hole on a plurality of same positions of last coil guide layer, last through hole connectivity layer, magnetic core substrate layer, lower through-hole connectivity layer and lower coil guide layer.The lead to the hole site that is provided with in this embodiment is the same with embodiment one with a number average, in this not repeat specification.Likewise; First sets of vias that first coil is passed through is being defined as the a1 sets of vias; First sets of vias that second coil is passed through is being defined as the b1 sets of vias; For second sets of vias, third through-hole group ..., the n sets of vias definition, promptly follow-up to be through the sets of vias of first coil a1, a2, a3 ..., an sets of vias; Follow-up to be through the sets of vias of second coil b1, b2, b3 ..., the bn sets of vias.
After on each laminar substrate above-mentioned sets of vias being set, each coil carries out coiling by the mode of being described below:
Shown in figure 11; First coil is along passing a1 sets of vias (promptly passing through hole 12a1,13a1,142a1,141a1,15a1 and 16a1 successively) successively from the bottom up from 12 beginnings of lower coil guide layer shown in the arrow; After arriving through hole 16a1; Pass the back from through hole 16a1 and arrive through hole 16a2 along the top of last coil guide layer 16, then after pass a2 sets of vias (promptly passing through hole 16a2,15a2,141a2,142a2,13a2 and 12a2 successively) shown in the arrow from top to bottom, arrive through hole 12a2, pass along the bottom of lower coil guide layer 12 from through hole 12a2 and to arrive through hole 12a3; Pass the a3 sets of vias then from the bottom up; And the like ..., when arriving an sets of vias, along from the bottom up or direction from top to bottom pass an sets of vias.The concrete direction of passing an sets of vias is by the through hole number decision that is provided with, and promptly by the n decision, when n was odd number, first coil finally passed from last coil guide layer 16, and the direction of therefore passing an sets of vias is for from the bottom up; When n is even number, first coil will be got back to lower coil guide layer 12 and pass, and the direction of therefore passing an sets of vias is for from top to bottom.First coil passes through hole according to aforesaid way, and promptly by the relative position decision of each sets of vias, the relative position that is provided with of each sets of vias makes the coil of winning in common-mode filter perspective view from top to bottom, be helix shape to its final coiling form.Shown in figure 12, in this embodiment, common-mode filter perspective view from top to bottom.Can know in conjunction with Figure 11 and Figure 12; The relative position of each sets of vias is communicated with through broken line among Figure 11; Therefore among Figure 12 during perspective view; First coil 21 is the helix form, and real segment 214,215 and 216 is the part that corresponding first coil passes through from last coil guide layer 16, and phantom line segments 211,212 and 213 is the part that corresponding first coil passes through from lower coil guide layer 12.
The coiling mode of second coil is similar with first coil; Promptly second coil pass from the bottom up successively said b1 sets of vias (promptly passing through hole 12b1,13b1,142b1,141b1,15b1 and 16b1 successively), from top to bottom pass said b2 sets of vias (promptly passing through hole 16b2,15b2,141b2,142b2,13b2 and 12b2 successively), from the bottom up pass said b3 sets of vias ..., pass said bn sets of vias along the p1 direction; When n was odd number, the p1 direction was for from the bottom up; When n was even number, the p direction was for from top to bottom.In this embodiment; B1, b2 ..., in the bn sets of vias; The relative position that is provided with of each sets of vias makes said second coil in common-mode filter perspective view from top to bottom, be helix shape, and makes that the helix of said second coil 22 equates with the helix width of said first coil 21, the hand of spiral is relative.Still combine Figure 11 and shown in Figure 12, b1 among Figure 11, b2 ..., the relative position of each sets of vias also is to be communicated with through broken line in the bn sets of vias, so among Figure 12 during perspective view, second coil 22 is the helix form.Pass through the setting of sets of vias position simultaneously; Make the helix width d2 of second coil 22 among Figure 12 equal the helix width d1 of first coil 21, and the hand of spiral of the helix of second coil 22 (being depicted as the right side from figure to a left side like arrow s2 among the figure) is relative with the hand of spiral of the helix of first coil 21 (being depicted as a left side from figure to right like arrow s1 among the figure).
On first substrate of composition magnetic core substrate layer and second substrate magnetic core is set respectively in this embodiment; Magnetic core is along the closed figures setting; In common-mode filter perspective view from top to bottom, closed figures is passed the helix of first coil and the helix of second coil.Can know that from Figure 12 perspective view the closed figures of magnetic core in this embodiment (1410 and 1420) is a rectangle, the helix of first coil 21 is passed on a long limit of rectangle, and the helix of second coil 22 is passed on another long limit.Likewise,, the closed figures that magnetic core is provided with can also be curve or irregular polygon, as long as closed figures is passed the helix of first coil 21 and the helix of second coil 22.
Common-mode filter in this embodiment; Only coil is from the bottom up on the coiling mode of each layer; Different from top to bottom with embodiment one; But it is all identical with embodiment one that the position that it is formed, each is formed is provided with the course of work of relation and common-mode filter; Therefore the common-mode filter in this embodiment can reach the effect of common-mode filter in the embodiment one equally, effectively suppress common-mode signal, and difference mode signal passes through with lower loss to greatest extent that is:; The magnetic line of force that coil produces concentrates in the inner embedding closed magnetic circuit magnetic core of common-mode filter, with respect to laminated type ferrite common-mode filter of the prior art, can reduce leakage field; Simultaneously with respect to laminated type dielectric ceramic common-mode filter of the prior art; Common-mode filter need not wanted the more wire circle of coiling; Can reach bigger mode impedance value, when being identical mode impedance value, the number of turns of interior electrode coil is less; The noble metal slurry of required consumption is also less, and the element cost is lower.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, make some substituting or obvious modification under the prerequisite of the present invention design not breaking away from, and performance or purposes are identical, all should be regarded as belonging to protection scope of the present invention.
Claims (8)
1. a common-mode filter is characterized in that: comprise the upper substrate (17) of lamination setting from top to bottom, last coil guide layer (16), magnetic core substrate layer (14), lower coil guide layer (12), infrabasal plate (11), first coil (21) and second coil (22);
Be respectively arranged with through hole on a plurality of same positions of said upward coil guide layer (16), magnetic core substrate layer (14), lower coil guide layer (12); The said through hole of going up on coil guide layer (16), magnetic core substrate layer (14), the above same position of lower coil guide layer (12) form respectively a1 sets of vias corresponding to said first coil (21), a2 sets of vias ..., an sets of vias and corresponding to the b1 sets of vias of said second coil (22), b2 sets of vias ..., the bn sets of vias;
Said first coil (21) pass from top to bottom successively said a1 sets of vias, from the bottom up pass said a2 sets of vias, from top to bottom pass said a3 sets of vias ..., pass said an sets of vias along the p direction; When n was odd number, the p direction was for from top to bottom; When n was even number, the p direction was for from the bottom up; The relative position of each said sets of vias setting makes said first coil (21) in said common-mode filter perspective view from top to bottom, be helix shape;
Said second coil (22) pass from top to bottom successively said b1 sets of vias, from the bottom up pass said b2 sets of vias, from top to bottom pass said b3 sets of vias ..., pass said bn sets of vias along the p direction; When n was odd number, the p direction was for from top to bottom; When n was even number, the p direction was for from the bottom up; The relative position that is provided with of each said sets of vias makes said second coil (22) in said common-mode filter perspective view from top to bottom, be helix shape, and makes that the helix of said second coil (22) equates with the helix width of said first coil (21), the hand of spiral is relative;
Said magnetic core substrate layer (14) comprises at least one laminar substrate; On the said substrate of each layer magnetic core is set all; Said magnetic core is along the closed figures setting; In said common-mode filter perspective view from top to bottom, said closed figures is passed the helix of said first coil (21) and the helix of said second coil (22).
2. common-mode filter according to claim 1 is characterized in that: the closed figures of said magnetic core is a rectangle, and the helix of said first coil (21) is passed on a long limit of said rectangle, and the helix of second coil (22) is passed on another long limit.
3. common-mode filter according to claim 1 is characterized in that: the closed figures of said magnetic core is curve or irregular polygon.
4. common-mode filter according to claim 1; It is characterized in that: said common-mode filter also comprises through hole connectivity layer (15) and lower through-hole connectivity layer (13); The said through hole connectivity layer (15) of going up is arranged at said going up between coil guide layer (16) and the magnetic core substrate layer (14), and said lower through-hole connectivity layer (13) is arranged between said magnetic core substrate layer (14) and the lower coil guide layer (12); Said going up on through hole connectivity layer (15) and the lower through-hole connectivity layer (13) offers through hole, and the position of offering through hole is corresponding to the position of offering through hole on said coil guide layer (16), magnetic core substrate layer (14), the lower coil guide layer (12).
5. common-mode filter according to claim 1; It is characterized in that: the bulk material of said upper substrate (17), last coil guide layer (16), magnetic core substrate layer (14), lower coil guide layer (12), infrabasal plate (11) is that dielectric constant is the ceramic material of ε, 4＜ε＜30.
6. common-mode filter according to claim 1 is characterized in that: said magnetic core is that relative permeability is the core material of μ, 2＜μ＜200.
7. common-mode filter according to claim 1 is characterized in that: said magnetic core is a Ferrite Material.
8. a common-mode filter is characterized in that: comprise the upper substrate (17) of lamination setting from top to bottom, last coil guide layer (16), magnetic core substrate layer (14), lower coil guide layer (12), infrabasal plate (11), first coil (21) and second coil (22);
Be respectively arranged with through hole on a plurality of same positions of said upward coil guide layer (16), magnetic core substrate layer (14), lower coil guide layer (12); The said through hole of going up on coil guide layer (16), magnetic core substrate layer (14), the above same position of lower coil guide layer (12) form respectively a1 sets of vias corresponding to said first coil (21), a2 sets of vias ..., an sets of vias and corresponding to the b1 sets of vias of said second coil (22), b2 sets of vias ..., the bn sets of vias;
Said first coil (21) pass from the bottom up successively said a1 sets of vias, from top to bottom pass said a2 sets of vias, from the bottom up pass said a3 sets of vias ..., pass said an sets of vias along the p1 direction; When n was odd number, the p1 direction was for from the bottom up; When n was even number, the p1 direction was for from top to bottom; The relative position of each said sets of vias setting makes said first coil (21) in said common-mode filter perspective view from top to bottom, be helix shape;
Said second coil (22) pass from the bottom up successively said b1 sets of vias, from top to bottom pass said b2 sets of vias, from the bottom up pass said b3 sets of vias ..., pass said bn sets of vias along the p1 direction; When n was odd number, the p1 direction was for from the bottom up; When n was even number, the p1 direction was for from top to bottom; The relative position that is provided with of each said sets of vias makes said second coil (22) in said common-mode filter perspective view from top to bottom, be helix shape, and makes that the helix of said second coil (22) equates with the helix width of said first coil (21), the hand of spiral is relative;
Said magnetic core substrate layer (14) comprises at least one laminar substrate; On the said substrate of each layer magnetic core is set all; Said magnetic core is along the closed figures setting; In said common-mode filter perspective view from top to bottom, said closed figures is passed the helix of said first coil (21) and the helix of said second coil (22).
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| CN2012101685878A CN102682953A (en) | 2012-05-28 | 2012-05-28 | Common mode filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107210114A (en) * | 2015-02-17 | 2017-09-26 | 松下知识产权经营株式会社 | common-mode noise filter |
| CN112147426A (en) * | 2019-06-11 | 2020-12-29 | 美磊电子科技(昆山)有限公司 | Common mode filter insulation resistance test method capable of improving accuracy |
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Application publication date: 20120919 |