CN101364470A - Transformer - Google Patents
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- CN101364470A CN101364470A CNA2008101101540A CN200810110154A CN101364470A CN 101364470 A CN101364470 A CN 101364470A CN A2008101101540 A CNA2008101101540 A CN A2008101101540A CN 200810110154 A CN200810110154 A CN 200810110154A CN 101364470 A CN101364470 A CN 101364470A
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Abstract
The invention provides a transformer, the magnetic coupling between the windings thereof has high efficiency, and the frequency characteristic is superior. The transformer (100) is provided with a magnetic core (10), and first through fourth windings wound on the winding core portion (10a) of the core (10). A first distance in a radial direction of a wire between the first winding (11) and the third winding (13), a second distance in the radial direction of the wire between the first winding (11) and the fourth winding (14), a third distance in the radial direction of the wire between the second winding (12) and the third winding (13), and a fourth distance in the radial direction of the wire between the second winding (12) and the fourth winding (14) are substantially equal in the same turn. Since the distance between the primary winding and the secondary winding is substantially equal in the same turn, the magnetic coupling is high, and the frequency characteristic is superior.
Description
Technical field
The present invention relates to the isallobaric device parts of a kind of pulse transformer, particularly the winding construction of transformer part.
Background technology
Local area network (LAN)) etc. (Local Area Network: the communication high speed in the communications field, the trend of high capacity are constantly quickened for internet, LAN.Under this background, there is the many-sided exploitation that relates to follow the digitized new load mode that transmits signal and IC (integrated circuit).Therein, communication is one of requisite electronic equipment in the communication system with pulse transformer (broadband transmission transformer), and its requirement has the characteristic of the leap progress of the corresponding communication technology.
Figure 17 is the summary stereoscopic figure (referring to Patent Document 1) of an example of the structure of the existing pulse transformer 500 of expression.
As shown in figure 17, this pulse transformer 500 has such structure: be wound with primary side winding 42 and primary side winding 43 on ring-type iron core 41.Primary side winding 42 is made of first and second windings 11,12, one end 11a of first winding 11 constitutes an input terminal of primary side winding 42, and, one end 12a of the other end 11b of first winding 11 and second winding 12 is connected, and the mid point of formation primary side winding 42, the other end 12b of second winding 12 constitutes another input terminal of primary side winding 42.In addition, primary side winding 43 is made of third and fourth winding 13,14, one end 13a of the tertiary winding 13 constitutes a lead-out terminal of primary side winding 43, and, one end 14a of the other end 13b of the tertiary winding 13 and the 4th winding 14 is connected, and the mid point of formation primary side winding 43, the other end 14b of the 4th winding 14 constitutes another lead-out terminal of primary side winding 43.
But the winding operation on ring-type iron core 41 is very miscellaneous, exists this problem of automation that is difficult to.In addition, because the connection between the winding, and become complicated distribution state, therefore, also existing characteristic has fluctuation, reliability to reduce such problem.In addition, owing to become complicated distribution state, therefore, exist and be difficult to make this problem of product miniaturization.
On the other hand, be easy to magnetic core, cydariform iron core (for example, referring to Patent Document 2) known for everyone as winding operation.But even under the situation of having used the cydariform iron core, the magnetic coupling between winding is insufficient sometimes according to its method for winding, can not obtain good frequency characteristic.
Patent documentation 1: Japanese kokai publication hei 7-161535 communique
Patent documentation 2: TOHKEMY 2003-100531 communique
As mentioned above, follow the high speed and the high capacity of communication, pulse transformer also requires leap progressive.The pulse transformer preferably broadband transmission characteristic of signal is good, and, can shield common-mode noise fully.For this reason, frequency characteristic is improved, make the reproducibility height of high-frequency digital signal waveform.
Summary of the invention
Thereby, the object of the present invention is to provide a kind of transformer part, the magnetic coupling efficient height between its winding, and frequency characteristic is good.
The present inventor studies with keen determination for solving above-mentioned problem, found that the position relation of each winding in the same circle can be exerted one's influence to frequency characteristic.It is cognitive and finish to the present invention is based on such technology.
That is, above-mentioned purpose of the present invention can be reached by following transformer part, and this transformer part is characterised in that described transformer part has: first and second windings, and they constitute the primary side winding; Third and fourth winding, they constitute the primary side winding; And magnetic core, first to fourth winding is wound on this magnetic core, in same circle, the distance on the distance on the distance on first winding and the online diametric(al) of the tertiary winding, first winding and the online diametric(al) of the 4th winding, second winding and the online diametric(al) of the tertiary winding and second winding equate in fact with distance on the online diametric(al) of the 4th winding.
According to the present invention,, therefore, can almost not produce the part raising magnetic coupling of phase deviation at the signal flow that flows because the distance between primary side winding in same circle and the primary side winding is impartial.Thereby, can realize the raising of the frequency characteristic of transformer.
In the present invention, preferably: in same circle, first winding contacts with the tertiary winding, and first winding contacts with the 4th winding, and second winding contacts with the tertiary winding, and second winding contacts with the 4th winding.Like this, can make primary side winding and the distance between the primary side winding in the same circle the shortest.Thereby, just can access higher magnetic coupling.
In the present invention, preferably: the distance on first winding in the same circle and the online diametric(al) of second winding is far away than the distance on first winding in the same circle and the online diametric(al) of the tertiary winding.In the case, also can make the tertiary winding in the same circle and the distance on the online diametric(al) of the 4th winding, equate in fact with distance on the online diametric(al) of the tertiary winding with first winding in the same circle.Perhaps, also can make first winding in the same circle and the distance on the online diametric(al) of second winding, equate in fact with distance on the online diametric(al) of the 4th winding with the tertiary winding in the same circle.Under the former situation, have winding work easily this advantage that becomes, in the latter case, have more evenly this advantage of magnetic-coupled balance.
In the present invention, preferably: first to fourth winding has the identical number of turn, and the coupling part of first winding and second winding constitutes the mid point of primary side winding, and the coupling part of the tertiary winding and the 4th winding constitutes the mid point of primary side winding.In addition, preferably: after second circle, first winding contacts the 4th winding of last circle, and the tertiary winding contacts second winding of last circle.
In transformer part of the present invention, preferably: this transformer part has the two-layer winding layers that is made of first and second winding layers, first winding layers is reeled by the two-wire of the first and the 4th winding and is constituted, and second winding layers is reeled by the two-wire of the 3rd and second winding and constituted.According to this structure, can suppress the fluctuation of winding line length, can realize the little transformer part of inductance fluctuation.
In the transformer part of the present invention, further preferably: this transformer part has the two-layer winding layers that is made of first and second winding layers, in half zone of the volume core of magnetic core, two-wire is reeled the first and the 4th winding as first winding layers, two-wire is reeled the 3rd and second winding as second winding layers, on the other hand, in remaining half the zone of volume core, the two-wire coiling second and the tertiary winding are as first winding layers, and two-wire is reeled the first and the 4th winding as second winding layers.Though the line length of the winding of outer circumferential side is longer than the winding of interior all sides, according to this structure, can suppress the fluctuation of the line length of winding part, can realize the little transformer part of inductance fluctuation.
In the transformer part of the present invention, preferably: this transformer part also has first and second Wiring patterns, this first and second Wiring pattern is formed on the printed base plate that magnetic core is installed, preferably: first winding carried out with being connected by first Wiring pattern on the printed base plate of second winding, and the tertiary winding carried out with being connected by second Wiring pattern on the printed base plate of the 4th winding.Like this, only transformer part is installed on the printed base plate, constitutes between the overhang of transformer part and just connect, therefore, can not make winding operation become easy the operation that couples together between the line with regard to not needing in advance by the bonding conductor pattern.In addition, owing to also simplified the distribution situation, therefore, can eliminate characteristics fluctuation, reliability reduces this problem, can also make the product miniaturization.
Preferably: transformer part of the present invention also has the resin cover of taking in the cydariform iron core, and first to fourth winding is wound on the cydariform iron core across the resin cover.In the case, particularly preferably be: the resin cover and any bight chamfering that contacts in first to fourth winding.Under situation about the cydariform iron core being accommodated in the resin cover, it is right to form these terminal electrodes in the bottom surface of resin cover.Therefore, it is right need not form terminal electrode on the cydariform iron core, does not also just need the insulating coating of cydariform iron core.In addition, because the leaf spring that has of resin cover acts on winding, therefore, can make winding always be in the state of appropriate tensioning, the state that can make its one-tenth be difficult to scatter.And, if the resin cover just is easy to carry out chamfer machining, carry out chamfering by bight to the resin cover, can prevent the damage of winding.
Like this,, therefore, the magnetic-coupled efficient between winding can be improved, the raising of frequency characteristic can be realized because the primary side winding and the distance between the primary side winding of transformer part of the present invention in same circle is impartial.
Description of drawings
Fig. 1 is the approximate three-dimensional map of the surface structure of the described transformer part 100 of expression preferred first execution mode of the present invention.
Fig. 2 is the summary upward view of the bottom surface structure of indication transformer parts 100.
Fig. 3 is mounted in the equivalent circuit diagram of the transformer part 100 under the state on the printed base plate 30.
Fig. 4 is the general profile chart of the winding construction of indication transformer parts 100.
Fig. 5 is the schematic diagram that amplifies same circle part X shown in Figure 4.
Fig. 6 is the general profile chart of described transformer part 600 winding constructions of expression reference example.
Fig. 7 is the schematic diagram that amplifies same circle part X shown in Figure 6.
Fig. 8 is the general profile chart of the winding construction of the described transformer part 200 of expression second execution mode of the present invention.
Fig. 9 is the schematic diagram that amplifies same circle part X shown in Figure 8.
Figure 10 is the general profile chart of the winding construction of the described transformer part 300 of expression the 3rd execution mode of the present invention.
Figure 11 is the general profile chart of the winding construction of the described transformer part 400 of expression the 4th execution mode of the present invention.
Figure 12 is the approximate three-dimensional map of the surface structure of the described transformer part 700 of expression the 5th execution mode of the present invention.
Figure 13 is the exploded perspective view of transformer part 700.
Figure 14 is the cutaway view along the transformer part 700 of the A-A line among Figure 12.
Figure 15 is the curve chart of the insertion loss (signal attenuation characteristic) of indication transformer parts.
Figure 16 is the curve chart of the noise attentuation characteristic of indication transformer parts.
Figure 17 is the general profile chart that the existing winding construction of cydariform iron core is used in expression.
Label declaration
10: magnetic core; 10A: cydariform iron core; 10B: tabular iron core; 10a: the volume core of cydariform iron core; 10b, 10c: the flange part of cydariform iron core; 11: the first windings; 11a a: end of first winding; 11b: the other end of first winding; 12: the second windings; 12a a: end of second winding; 12b: the other end of second winding; 13: the tertiary winding; 13a a: end of the tertiary winding; 13b: the other end of the tertiary winding; 14: the four windings; 14a a: end of the 4th winding; 14b: the other end of the 4th winding; 15A: primary side winding; 15B: primary side winding; 16: resin cover: 16a: the volume core of resin cover; 16b, 16c: the flange part of resin cover; 16d: the bight of the volume core of resin cover: 16e: the vertical plate of the volume core of resin cover: 21a, 21b: the first terminal electrode pair; 22a, 22b: second terminal electrode is right; 23a, 23b: the 3rd terminal electrode is right; 24a, 24b: the 4th terminal electrode is right; 30: printed base plate; 30X: installation region; 31a, 31b: the first joint pattern is right; 32a, 32b: the second joint pattern is right; 33a, 33b: the 3rd joint pattern is right; 34a, 34b: the 4th joint pattern is right; 35: the first conductive patterns; Conductive pattern 41 in 36: the second: the ring-type iron core; 42: the primary side winding; 43: the primary side winding; 100: transformer part; 200: transformer part; 300: transformer part; 400: transformer part; 500: existing transformer part (pulse transformer); 600: the described transformer part of reference example (pulse transformer); X: same circle part.
Embodiment
Below, with reference to the accompanying drawings preferred implementation of the present invention is elaborated.
Fig. 1 is the approximate three-dimensional map of the surface structure of the described transformer part 100 of expression preferred first execution mode of the present invention.In addition, Fig. 2 is the summary upward view of the bottom surface structure of indication transformer parts 100.
As depicted in figs. 1 and 2, transformer part 100 has: magnetic core 10, and it has shaft-like volume core 10a; With first to fourth winding 11～14, they are wound on the magnetic core 10.First to fourth winding 11～14 has the identical number of turn.
The magnetic core 10 of present embodiment is made of cydariform iron core 10A and the tabular iron core 10B that is installed in cydariform iron core 10A top.Cydariform iron core 10A has: shaft-like volume core 10a; With flange part 10b, 10c, they are separately positioned on the both ends of volume core 10a, and they have incorporate structure.Tabular iron core 10B and cydariform iron core 10A are splits, and it is fixed on the upper surface of flange part 10b, 10c.Like this, cydariform iron core 10A and tabular iron core 10B constitute a closed magnetic circuit.Though be not particularly limited,, can use the Mn-Zn based ferrite as the material of magnetic core 10.In addition, on the surface of magnetic core 10, preferably implement the insulating coating of paraxylene (paraxylylene) etc.
On the other hand, on printed base plate 30, be provided with the installation region 30X of transformer part 100, in the 30X of the installation region of transformer part 100, be provided with first to fourth and engage pattern 31a, 31b～34a, 34b.First to fourth joint pattern is corresponding to 21a, 21b～24a, 24b with above-mentioned first to fourth terminal electrode respectively to 31a, 31b～34a, 34b.And, in the 30X of the installation region of transformer part 100, be formed with first and second conductive patterns 35,36.First conductive pattern 35 with engage pattern 31b and engage pattern 32a short circuit, second conductive pattern 36 with engages pattern 33b and joint pattern 34a short circuit.Thereby, when transformer part 100 is installed, between the end of first winding 11 and second winding 12, connect by first conductive pattern 35, between the end of the tertiary winding 13 and the 4th winding 14, connect by second conductive pattern 36.
Fig. 3 is mounted in the equivalent circuit diagram of the transformer part 100 under the state on the printed base plate 30.
As shown in Figure 3, among first to fourth winding 11～14 that is wound on the volume core 10a of magnetic core 10, first and second windings 11,12 constitute the primary side winding 15A of transformer part 100, and third and fourth winding 13,14 constitutes the primary side winding 15B of transformer part 100.One end 11a of first winding 11 constitutes the terminal of primary side winding 15A, one end 12a of the other end 11b of first winding 11 and second winding 12 is connected, and the mid point of formation primary side winding 15A, the other end 12b of second winding 12 constitutes the another terminal of primary side winding 15A.In addition, one end 13a of the tertiary winding 13 constitutes the terminal of primary side winding 15B, one end 14a of the other end 13b of the tertiary winding 13 and the 4th winding 14 is connected, and constitutes the mid point of primary side winding 15B, and the other end 14b of the 4th winding 14 constitutes the another terminal of primary side winding 15B.
Fig. 4 is the general profile chart of detailed situation of the winding construction of indication transformer parts 100, and Fig. 5 is the schematic diagram that amplifies same circle part X.
As shown in Figure 4, be wound with first to fourth winding 11～14 on the volume core 10a of magnetic core 10, they have double-layer structure.The first and the 4th winding 11,14 is wound on by monolayer alignment on the volume core 10a of magnetic core 10, constitutes the winding layers of ground floor.In addition, the 3rd and second winding 13,12 is wound on first winding layers by monolayer alignment, constitutes second layer winding layers.That is, the first and the 4th winding 11,14 two-wires are wound into ground floor (interior all sides), and the 3rd is wound on into the second layer (outer circumferential side) with second winding, 13,12 two-wires.So-called " two-wire coiling " is meant by 2 coilings are reeled together, the winding method that the magnetic coupling between winding is improved.
As shown in Figure 4 and Figure 5, first to fourth winding 11～14 in same circle has as upper/lower positions and concerns: first winding 11 contacts with third and fourth winding 13,14, and second winding 12 contacts with third and fourth winding 13,14.Thus, in same circle, the distance L on first winding 11 and the tertiary winding 13 online diametric(al)s
13, the distance L on first winding 11 and the 4th winding 14 online diametric(al)s
14, the distance L on second winding 12 and the tertiary winding 13 online diametric(al)s
23, and second winding 12 and the 4th winding 14 online diametric(al)s on distance L
24, equal in fact.Herein, the distance of so-called winding as shown in Figure 5, is meant that the central part with line is the distance of benchmark.
In the present embodiment, because the winding 13,12 of the second layer is configured to be embedded in the pit between the winding 11,14 that is formed at ground floor, therefore, the position on the 3rd and second winding 13, the 12 online diametric(al)s is with the first and the 4th winding 11,14 half pitch that staggers.Thereby in same circle, first winding 11 does not contact with second winding 12, the distance L on first winding 11 and second winding, the 12 online diametric(al)s
12, than the distance L on the tertiary winding in the same circle 13 and the 4th winding 14 online diametric(al)s
34Grow.On the other hand, in same circle, the tertiary winding 13 contacts with the 4th winding 14, the distance L on the tertiary winding 13 and the 4th winding 14 online diametric(al)s
34, with above-mentioned distance L
13, L
14, L
23, L
24Equate.
Like this, according to the transformer part 100 of present embodiment, primary side winding in same circle and the distance L between the primary side winding
13, L
14, L
23, L
24Equal in fact, because therefore their contacts in same circle, can improve the magnetic coupling efficient of each winding, can realize the raising of the frequency characteristic of transformer.In addition, because can be with the pit between the winding 11,14 that is formed on ground floor as guiding, therefore the winding 13,12 of the coiling second layer, can easily carry out winding work.
Fig. 6 is the general profile chart around the roped party structure of the described transformer part 600 of expression comparative example, and Fig. 7 is the schematic diagram that amplifies same circle part X.Fig. 6 and example shown in Figure 7, will by first and a pair of winding that constitutes of the tertiary winding 11,13 as ground floor, a pair of winding that will be made of the second and the 4th winding 12,14 is as the second layer.
In Fig. 6 and example shown in Figure 7, about the distance of primary side winding in the same circle and primary side winding, L
13,, L
23, L
24Though equal in fact, L
14Just long than them.That is, the primary side winding in the same circle and the distance of primary side winding are unequal with regard to some, will produce imbalance slightly in magnetic coupling.
Relative therewith, in the described transformer part 100 of present embodiment, as mentioned above, because the primary side winding in same circle and the distance L of primary side winding
13, L
14, L
23, L
24Equal in fact, therefore, can obtain higher magnetic coupling, just can access good frequency characteristic.
Fig. 8 is the general profile chart of the winding construction of the described transformer part 200 of expression second execution mode of the present invention, and Fig. 9 is the schematic diagram that amplifies same circle part X.
As Fig. 8 and shown in Figure 9, this transformer part 200 has such winding construction: be arranged at the 3rd and second winding 13,12 of the second layer, be configured in respectively the first and the 4th winding 11,14 that is arranged at ground floor directly over.Thereby identical with the described transformer part of first execution mode 100, first winding 11 contacts with third and fourth winding 13,14, and second winding 12 contacts with third and fourth winding 13,14.In addition, in same circle, the distance L on first winding 11 and the tertiary winding 13 online diametric(al)s
13, the distance L on first winding 11 and the 4th winding 14 online diametric(al)s
14, the distance L on second winding 12 and the tertiary winding 13 online diametric(al)s
23And second the distance L on winding 12 and the 4th winding 14 online diametric(al)s
24, equal in fact.
On the other hand, in transformer part 200, in same circle, first winding 11 does not contact with second winding 12, and the tertiary winding 13 does not contact with the 4th winding 14.Therefore, the distance L on first winding 11 and second winding, the 12 online diametric(al)s
12, with the tertiary winding 13 in the same circle and the distance L on the 4th winding 14 online diametric(al)s
34Be equal to each other, all than above-mentioned distance L
13, L
14, L
23, L
24Grow.
Like this, in the described transformer part 200 of present embodiment, the distance L of primary side winding and primary side winding
13, L
14, L
23, L
24Not only be equal to each other, and, the distance L between the primary side winding
12, and the distance L between the primary side winding
34, also be equal to each other.Therefore, compare, just can make magnetic-coupled balance more even with the described transformer part 100 of first execution mode.
Figure 10 is the general profile chart of the winding construction of the described transformer part 300 of expression the 3rd execution mode of the present invention.
As shown in figure 10, this transformer part 300 has following characteristic point: with the position of the 4th winding 14 of transformer part shown in Figure 1 100 and the place-exchange of the tertiary winding 13.That is, it has such structure: first winding 11 is wound on ground floor with the tertiary winding 13 two-wires, and the 4th winding 14 and second winding, 12 two-wires are wound on the second layer.For other structure, since identical with first execution mode, therefore, same structural element is given same label and omitted its explanation.
In the present embodiment, because the primary side winding in the same circle and the distance L of primary side winding
13, L
14, L
23, L
24In fact also be equal to each other, therefore also identical with transformer part 100, can obtain very high magnetic coupling, can access good frequency characteristic.
Figure 11 is the general profile chart of detailed situation of the winding construction of expression the 4th execution mode of the present invention described transformer part 400.
As shown in figure 11, the characteristic point of this transformer part 400 is: the coiling zone of magnetic core 10 serves as that boundary is divided into 2 zones with the centre position (Y-Y line) of volume core 10a axial (length direction), and the winding construction in each zone differs from one another.
At first, in the S1 of half zone (the first coiling zone) of volume core 10a, at ground floor (interior all sides) two-wire the first and the 4th winding 11,14 of reeling, at the second layer (outer circumferential side) two-wire the 3rd and second winding 13,12 of reeling.That is, in this part, have the coiling pattern identical with the described transformer part of first execution mode 100.
On the other hand, in the S2 of half zone of residue (the second coiling zone) of volume core 10a, at the ground floor two-wire coiling second and the tertiary winding 12,13, at second layer two-wire coiling the first and the 4th winding 11,14.That is, has the coiling pattern that the ground floor and the second layer have exchanged.
Like this, exchanged in the centre position under the situation of winding layers up and down, because the line length of the winding of the first and the 4th winding 11,14 part, with second and the line length of the winding of the tertiary winding 12,13 part, identical in fact, therefore, can make the inductance unanimity of each winding, simultaneously, can make that balance is coupled well between each winding.
Figure 12 is the approximate three-dimensional map of the surface structure of the described transformer part 700 of expression the 5th execution mode of the present invention, and Figure 13 is the exploded perspective view of transformer part 700.In addition, Figure 14 is the cutaway view along the transformer part of the A-A line among Figure 12.
As Figure 12 and shown in Figure 13, the characteristic point of this transformer part 700 is: have the resin cover 16 that is used to take in cydariform iron core 10A.Because the described transformer part of other structural element and first execution mode 100 is basic identical, therefore, same structural element is given same label and is omitted its repeat specification.
Bottom surface at the flange part 16b of resin cover 16 is formed with 4 terminal electrode 21a～24a, in the bottom surface of flange part 16c, is formed with 4 terminal electrode 21b～24b (terminal electrode 21b～23b is not shown).Because cydariform iron core 10A and tabular iron core 10B are same as described above, are made by the sintered body of Mn-Zn based ferrite, therefore, magnetic susceptibility is very high, and its fixed resistance is very low on the other hand, has conductivity.Thereby, in the flange part 10b of cydariform iron core 10A, the bottom surface of 10c, can not directly form terminal electrode to (21a, 21b)～(24a, 24b), on the surface of cydariform iron core 10A, the insulating coating of needs enforcement paraxylene etc.But, cydariform iron core 10A is being received under the situation of resin cover 16, it is right just not need to form terminal electrode on cydariform iron core 10A, and in the flange part 16b of resin cover 16, the bottom surface of 16c, it is right to form these terminal electrodes.In addition, each terminal electrode 21a～24a, the connection status of 21b～24b and winding 11～14 and shown in Figure 3 the same.
As shown in figure 13, even under the receiving state of cydariform iron core 10A, the part of its flange part 10b, 10c is also exposed on resin cover 16.This is because the flange part 10b of cydariform iron core 10A, the height of 10c, than the higher cause of height of the inboard of flange part 16b, the 16c of resin cover 16.Relative therewith, the height of the volume core 10a of cydariform iron core 10A, lower than the height of the inboard of the volume core 16a of resin cover 16, thus the volume core 10a of cydariform iron core 10A is accommodated in the volume core 16a of resin cover 16 fully.
The bight 16d of the volume core 16a of resin cover 16 preferably is chamfered to be the fillet shape.Though be coiling winding 11～14 on volume core 16a, be under the situation at right angle at the bight 16d of volume core 16a, there is the danger of damage winding.Considered that also the bight of the volume core 10a of grinding cydariform iron core 10A forms the situation of circular face, but the fillet of magnetic material sintered body is processed and is not easy, the danger that exist the bight to lack in a large number.But resin cover 16 is made of resin material, and the fillet processing in bight is very easy to.Become under the situation of fillet at the bight 16d that makes volume core 16a by such processing, can not damage winding.Thereby, can realize the transformer part that reliability is high.And the chamfering of bight 16d is not limited in circular face, also can be the plane.
Be wound on the position relation of first to fourth winding 11～14 on the volume core 16a of resin cover 16,, can adopt pattern arbitrarily with Fig. 4, Fig. 8, Figure 10 or shown in Figure 12 the same.Under the situation on the volume core 16a that winding 11～14 is wound on resin cover 16, as shown in figure 14, the leaf spring that the vertical plate 16e of resin cover 16 is had acts on winding.Thereby, by with suitable power coiling winding, can make winding always be in the state of appropriate tensioning, can make it become the state that is difficult to scatter.
Figure 15 is the curve chart of the insertion loss (signal attenuation characteristic) of indication transformer parts, and transverse axis is represented frequency (MHz), and the longitudinal axis is represented the attenuation (dB) of signal.In addition, Figure 16 is the curve chart of the common-mode noise attenuation characteristic of indication transformer parts, and transverse axis is represented frequency (MHz), and the longitudinal axis is represented noise attenuation (dB).In Figure 15 and Figure 16, curve P
1Be the measurement result of the described transformer part 100 of first execution mode shown in Figure 4, curve P
2Be the measurement result of the described transformer part 600 of reference example shown in Figure 6, curve P
3It is measurement result with (not shown) under the situation of first to fourth winding 11～14 as a twisted wire.
As shown in figure 15, as can be seen, the signal attenuation characteristic of the described transformer part 100 of first execution mode, better than the described transformer part of reference example 600, till high frequency band, the decay of signal is very little.And concern cut-off frequency (3dB is following), curve P
1Cut-off frequency f
C1Approximately be 520MHz, curve P
2Cut-off frequency f
C2Approximately be 181MHz, curve P
3Cut-off frequency f
C3Approximately be 270MHz.Like this, according to the present invention, can realize inserting the existing two-wire winding construction of loss ratio (P
2) or twisted wire structure (P
3) little, particularly at the little transformer part of the signal attenuation of high frequency.
In addition, as shown in figure 16, as can be seen, the common-mode noise attenuation characteristic of the described transformer part 100 of first execution mode, in the roughly whole zone of measuring frequency, compared with the described transformer part 600 of reference example, its noise attenuation is very big.For example, pay close attention to the noise attenuation of 100MHz, curve P
1Noise attenuation be-18.2dB curve P
2Noise attenuation be-13.4dB curve P
3Noise attenuation be-13.4dB.Like this, according to the present invention, can realize that the noise attentuation characteristic is than the described two-wire winding construction of reference example (P
2) or twisted wire structure (P
3) good transformer part.
From above result as can be known, the signal attenuation minimum, and the noise attentuation maximum, be exactly transformer part of the present invention.
More than, the present invention preferred embodiment is illustrated according to it, but the present invention is not limited in above-mentioned execution mode, in the scope that does not break away from purport of the present invention, all changes in addition, they are also contained in the scope of the present invention certainly.
For example, in the above-described embodiment, connect first winding 11 and second winding 12 by first conductive pattern 35 on the printed base plate 30, in addition, connect the tertiary winding 13 and the 4th winding 14 by second conductive pattern 36, but the present invention is not limited in such structure, also can be directly to connecting between the winding 11,12, perhaps directly to connecting between the winding 13,14.
In addition, in the above-described embodiment,, used cydariform iron core 10A, but the present invention is not limited in the cydariform iron core, also can utilizes ring-type iron core or other core configuration as magnetic core 10.
In addition, in the above-described embodiment, to 21a, 21b～24a, 24b, first to fourth winding 11～14 is linked in sequence to first to fourth terminal electrode, but the annexation between winding and the terminal electrode is not particularly limited in this, also can freely connect according to purpose.
Claims (11)
1. a transformer part is characterized in that,
Described transformer part has:
First and second windings, they constitute the primary side winding;
Third and fourth winding, they constitute the primary side winding; And
Magnetic core, described first to fourth winding is wound on this magnetic core,
In same circle, distance on the distance on the distance on described first winding and the online diametric(al) of the described tertiary winding, described first winding and the online diametric(al) of described the 4th winding, described second winding and the online diametric(al) of the described tertiary winding and described second winding equate in fact with distance on the online diametric(al) of described the 4th winding.
2. transformer part as claimed in claim 1 is characterized in that,
In same circle, described first winding contacts with the described tertiary winding, and described first winding contacts with described the 4th winding, and described second winding contacts with the described tertiary winding, and described second winding contacts with described the 4th winding.
3. transformer part as claimed in claim 1 is characterized in that,
Distance on described first winding in the same circle and the online diametric(al) of described second winding is far away than described first winding in the same circle and the distance on the online diametric(al) of the described tertiary winding.
4. transformer part as claimed in claim 3 is characterized in that,
Distance on described first winding in the same circle and the online diametric(al) of described second winding equates in fact with distance on the online diametric(al) of described the 4th winding with the described tertiary winding in the same circle.
5. transformer part as claimed in claim 1 is characterized in that,
Described first to fourth winding has the identical number of turn,
The coupling part of described first winding and described second winding constitutes the mid point of described primary side winding,
The coupling part of the described tertiary winding and described the 4th winding constitutes the mid point of described primary side winding.
6. the transformer part described in claim 1 is characterized in that,
Described transformer part has the two-layer winding layers that is made of first and second winding layers,
Described first winding layers is reeled by the two-wire of described first winding and described the 4th winding and is constituted,
Described second winding layers is reeled by the two-wire of the described tertiary winding and described second winding and is constituted.
7. the transformer part described in claim 1 is characterized in that,
Described transformer part has the two-layer winding layers that is made of first and second winding layers,
In half zone of the volume core of described magnetic core, two-wire is reeled the described first and the 4th winding as described first winding layers, and two-wire is reeled the described the 3rd and second winding as described second winding layers, on the other hand,
In remaining half zone of described volume core, two-wire reel described second and the tertiary winding as described first winding layers, two-wire is reeled the described first and the 4th winding as described second winding layers.
8. transformer part as claimed in claim 1 is characterized in that,
Described magnetic core comprises the cydariform iron core.
9. transformer part as claimed in claim 8 is characterized in that,
Described transformer part also has first and second Wiring patterns, and this first and second Wiring pattern is formed on the printed base plate that described magnetic core is installed,
Described first winding carried out with being connected by described first Wiring pattern on the described printed base plate of described second winding,
The described tertiary winding carried out with being connected by described second Wiring pattern on the described printed base plate of described the 4th winding.
10. transformer part as claimed in claim 8 is characterized in that,
Described transformer part also has the resin cover of taking in described cydariform iron core,
Described first to fourth winding is wound on the described cydariform iron core across described resin cover.
11. transformer part as claimed in claim 10 is characterized in that,
Described resin cover with described first to fourth winding in any bight chamfering that contacts.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007157484 | 2007-06-14 | ||
| JP2007157484 | 2007-06-14 | ||
| JP2008135236 | 2008-05-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101364470A true CN101364470A (en) | 2009-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101101540A Pending CN101364470A (en) | 2007-06-14 | 2008-06-13 | Transformer |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4600519B2 (en) |
| CN (1) | CN101364470A (en) |
| TW (1) | TWI441211B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI441211B (en) | 2014-06-11 |
| TW200912973A (en) | 2009-03-16 |
| JP4600519B2 (en) | 2010-12-15 |
| JP2009021558A (en) | 2009-01-29 |
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