JP4600519B2 - Transformer parts - Google Patents

Description

  The present invention relates to a transformer component such as a pulse transformer, and more particularly to a winding structure of a transformer component.

  The trend of increasing the speed and capacity of communication in the communication field such as the Internet and LAN (Local Area Network) is accelerating. In the background, there are various developments of new transmission methods and ICs (integrated circuits) accompanying digitization of transmission signals. Among them, a pulse transformer (broadband transmission transformer) for communication is one of the electronic devices indispensable for a communication system, and characteristics corresponding to the dramatic evolution of communication technology are required.

  FIG. 17 is a schematic external perspective view showing an example of the configuration of a conventional pulse transformer 500 (see Patent Document 1).

  As shown in FIG. 17, the pulse transformer 500 has a structure in which a primary winding 42 and a secondary winding 43 are wound around a toroidal core 41. The primary winding 42 includes first and second windings 11 and 12, and one end 11 a of the first winding 11 constitutes one input terminal of the primary winding 42 and the first winding 11. 11 is connected to one end 12a of the second winding 12 to form the middle point of the primary winding 42, and the other end 12b of the second winding 12 is connected to the primary winding 42. The other input terminal. The secondary winding 43 is composed of the third and fourth windings 13, 14. One end 13 a of the third winding 13 constitutes one output terminal of the secondary winding 43, and The other end 13b of the third winding 13 and one end 14a of the fourth winding 14 are connected to form the middle point of the secondary winding 43, and the other end 14b of the fourth winding 14 is The other output terminal of the secondary side winding 43 is comprised.

  However, there is a problem that the winding work around the toroidal core 41 is very complicated and difficult to automate. Further, since the wiring state becomes complicated due to the connection between the windings, there are problems such as variations in characteristics and a decrease in reliability. Moreover, since the wiring state is complicated, there is a problem that it is difficult to reduce the size of the product.

On the other hand, a drum core is known as a magnetic core that can be easily wound (see, for example, Patent Document 2). However, even when a drum core is used, depending on the winding method, the magnetic coupling between the windings may be insufficient, and good frequency characteristics may not be obtained.
JP-A-7-161535 Japanese Patent Laid-Open No. 2003-100531

  As described above, with the increase in communication speed and capacity, pulse transformers are also required to undergo dramatic evolution. It is desirable that the pulse transformer has good broadband signal transmission characteristics and can sufficiently block common mode noise. For this purpose, it is necessary to improve the frequency characteristics and to have high reproducibility of the high-frequency digital signal waveform.

  Accordingly, it is an object of the present invention to provide a transformer component with good magnetic coupling efficiency between windings and good frequency characteristics.

  The inventor of the present application has conducted extensive research to solve the above problems, and as a result, has found that the positional relationship of the windings in the same turn affects the frequency characteristics. The present invention has been made based on such technical knowledge.

  That is, the object of the present invention is to provide the first and second windings constituting the primary winding, the third and fourth windings constituting the secondary winding, and the first to fourth windings. A magnetic core around which the winding is wound, and the distance between the first winding and the third winding in the radial direction and the diameters of the first winding and the fourth winding in the same turn The distance in the direction, the distance in the radial direction between the second winding and the third winding, and the distance in the radial direction between the second winding and the fourth winding are substantially equal. This is achieved by transformer parts.

  According to the present invention, since the distance between the primary side winding and the secondary side winding in the same turn is uniform, it is possible to increase the magnetic coupling in a portion where a phase shift hardly occurs in the flowing signal. . As a result, the frequency characteristics of the transformer can be improved.

  In the present invention, in the same turn, the first winding and the third winding are in contact, the first winding and the fourth winding are in contact, and the second winding and the third winding are in contact. Preferably, the winding is in contact, and the second winding and the fourth winding are in contact. According to this, the distance between the primary side winding and the secondary side winding in the same turn can be minimized. Thereby, higher magnetic coupling can be obtained.

  In the present invention, the distance in the radial direction between the first winding and the second winding in the same turn is greater than the distance in the radial direction between the first winding and the third winding in the same turn. Distant is preferred. In this case, the distance in the radial direction between the third winding and the fourth winding in the same turn is substantially equal to the distance in the radial direction between the first winding and the third winding in the same turn. May be equal to. Alternatively, the distance in the radial direction between the first winding and the second winding in the same turn is substantially the same as the distance in the radial direction between the third winding and the fourth winding in the same turn. It does not matter if they are equal. In the former case, there is an advantage that the winding operation becomes easy, and in the latter case, there is an advantage that the balance of the magnetic coupling becomes more uniform.

  In the present invention, the first to fourth windings have the same number of turns, the connecting portion of the first winding and the second winding constitutes the middle point of the primary winding, and the third It is preferable that the connection portion between the second winding and the fourth winding constitute the midpoint of the secondary winding. In the second and subsequent turns, it is preferable that the first winding is in contact with the fourth winding of the previous turn, and the third winding is in contact with the second winding of the previous turn.

  The transformer component according to the present invention includes two winding layers including a first winding layer and a second winding layer, and the first winding layer is a bifilar winding of the first winding and the fourth winding. It is preferable that the second winding layer is formed by bifilar winding of the third winding and the second winding. According to this configuration, variation in the wire length of the winding can be suppressed, and a transformer component with less variation in inductance can be realized.

  The transformer component according to the present invention includes two winding layers composed of a first winding layer and a second winding layer, and the first winding layer includes first and second winding layers in a half region of the core portion of the magnetic core. The fourth winding is bifilar wound, and the third and second windings are bifilar wound on the second winding layer, while the first winding layer is formed in the remaining half of the winding core portion. It is also preferable that the second and third windings are bifilar wound, and the first and fourth windings are bifilar wound on the second winding layer. Although the wire length of the outer winding is longer than that of the inner winding, this configuration can suppress the variation in the wire length of the winding and realize transformer parts with less variation in inductance. can do.

  The transformer component according to the present invention preferably further includes first and second wiring patterns formed on a printed circuit board on which the magnetic core is mounted, and the connection between the first winding and the second winding is printed. The first wiring pattern on the substrate is preferably used, and the connection between the third winding and the fourth winding is preferably performed via the second wiring pattern on the printed circuit board. According to this, only by mounting the transformer component on the printed circuit board, the ends of the coils constituting the transformer component are connected to each other via the connection conductor pattern, so that it is not necessary to connect the wires in advance. Winding work can be facilitated. In addition, since the wiring situation is simplified, problems such as variations in characteristics and a decrease in reliability can be solved, and the product can be downsized.

  The transformer component of the present invention preferably further includes a resin cover that houses the drum core, and the first to fourth windings are preferably wound around the drum core via the resin cover. In this case, it is particularly preferable that the corner portion of the resin cover in contact with any one of the first to fourth windings is chamfered. When the drum core is housed in the resin cover, these terminal electrode pairs can be formed on the bottom surface of the resin cover. Therefore, it is not necessary to form the terminal electrode pair on the drum core, and the insulating coating on the drum core is also unnecessary. In addition, since the plate spring property of the resin cover acts on the winding, the winding can always be properly stretched, and the winding can be prevented from being collapsed. Furthermore, chamfering is easy with a resin cover, and damage to the windings can be prevented by chamfering the corners of the resin cover.

  Thus, the transformer component of the present invention has a uniform distance between the primary side winding and the secondary side winding in the same turn, so that the efficiency of magnetic coupling between the windings can be increased, and the frequency characteristics Can be improved.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing an external structure of a transformer component 100 according to a preferred first embodiment of the present invention. FIG. 2 is a schematic bottom view showing the structure of the bottom surface of the transformer component 100.

  As shown in FIGS. 1 and 2, the transformer component 100 includes a magnetic core 10 having a rod-shaped core portion 10 a and first to fourth windings 11 to 14 wound around the magnetic core 10. ing. The first to fourth windings 11 to 14 have the same number of turns.

  The magnetic core 10 of the present embodiment includes a drum core 10A and a plate-like core 10B attached to the top of the drum core 10A. The drum core 10A includes a rod-shaped core part 10a and flanges 10b and 10c provided at both ends of the core part 10a, respectively, and has a structure in which these are integrated. The plate-shaped core 10B is separate from the drum core 10A and is fixed to the upper surfaces of the flange portions 10b and 10c. Thus, the drum core 10A and the plate core 10B constitute one closed magnetic circuit. Although not particularly limited, Mn—Zn ferrite can be used as the material of the magnetic core 10. The surface of the magnetic core 10 is preferably provided with an insulating coating such as paraxylylene.

First to fourth terminal electrode pairs 21a, 21b to 24a, 24b are formed on the bottom surfaces of the flange portions 10b, 10c of the drum core 10A. The both ends 11a and 11b of the first winding 11 are connected to the first terminal electrode pair 21a and 21b, respectively. The both ends 12a and 12b of the second winding 12 are connected to the second terminal electrode 22a. , 22b are connected respectively to both end portions 13a of the third winding 13, 13b are respectively connected to the third terminal electrodes 23a, 23b, both end portions 14a of the fourth winding wire 14, 14b is The fourth terminal electrodes 24a and 24b are connected respectively.

On the other hand, the printed circuit board 30 is provided with a mounting area 30X of the transformer part 100, first through fourth land pattern pairs 31a in the mounting area 30X of the transformer parts 100, 31B～34a, is 34 b provided It has been. First through fourth land pattern pairs 31a, 31b~34a, 34 b is, first to fourth terminal electrode pairs 21a described above, 21B～24a, respectively correspond to 24b. Furthermore, first and second conductor patterns 35 and 36 are formed in the mounting region 30X of the transformer component 100. The first conductor pattern 35 short-circuits the land pattern 31b and the land pattern 32a, and the second conductor pattern short-circuits the land pattern 33b and the land pattern 34a. Thereby, when the transformer component 100 is mounted, the ends of the first winding 11 and the second winding 12 are connected to each other through the first conductor pattern 35, and the third winding 13 and the fourth winding are connected. The ends of the winding 14 are connected via the second conductor pattern 36.

  FIG. 3 is an equivalent circuit diagram of the transformer component 100 in a state where it is mounted on the printed circuit board 30.

  As shown in FIG. 3, among the first to fourth windings 11 to 14 wound around the core portion 10 a of the magnetic core 10, the first and second windings 11 and 12 are included in the transformer component 100. The primary side winding 15 </ b> A is configured, and the third and fourth windings 13 and 14 configure the secondary side winding 15 </ b> B of the transformer component 100. One end 11a of the first winding 11 constitutes one terminal of the primary side winding 15A, and the other end 11b of the first winding 11 and one end 12a of the second winding 12 are connected. The middle point of the primary side winding 15A is configured, and the other end 12b of the second winding 12 is the other terminal of the primary side winding 15A. The one end 13a of the third winding 13 constitutes one terminal of the secondary winding 15B, and the other end 13b of the third winding 13 and the one end 14a of the fourth winding 14 are The middle point of the secondary winding 15B is connected, and the other end 14b of the fourth winding 14 constitutes the other terminal of the secondary winding 15B.

  4 is a schematic cross-sectional view showing details of the winding structure of the transformer component 100, and FIG. 5 is an enlarged schematic view of the same turn portion X. As shown in FIG.

  As shown in FIG. 4, the first to fourth windings 11 to 14 are wound around the core portion 10 a of the magnetic core 10, and these have a two-layer structure. The first and fourth windings 11 and 14 are wound in a single layer on the winding core portion 10a of the magnetic core 10 and constitute a first winding layer. The third and second windings 13 and 12 are single-layer aligned winding on the first winding layer to constitute a second winding layer. That is, the first and fourth windings 11 and 14 are bifilar wound on the first layer (inner circumferential side), and the third and second windings 13 and 12 are bifilar wound on the second layer (outer circumferential side). ing. “Bifilar winding” refers to a winding method that improves the magnetic coupling between windings by winding two windings together.

As shown in FIGS. 4 and 5, the first to fourth windings 11 to 14 in the same turn have the first winding 11 in contact with the third and fourth windings 13 and 14, and the second winding 11 to 14. The winding 12 has a positional relationship in contact with the third and fourth windings 13 and 14. Thus, in the same turn, the wire diameter direction of the distance L ₁₃ of the first winding 11 and the third winding 13, the distance diameter direction of the first winding 11 and the fourth winding wire 14 L ₁₄ , the distance L _{23 in the} radial direction between the second winding 12 and the third winding 13, and the distance L _{24 in the} radial direction between the second winding 12 and the fourth winding 14 are: Substantially equal. Here, the winding distance refers to a distance based on the center of the winding, as shown in FIG.

In the present embodiment, the second-layer windings 13 and 12 are arranged so as to be fitted into the recesses formed between the first-layer windings 11 and 14, so that the third and second layers The positions of the windings 13 and 12 in the radial direction are shifted from the first and fourth windings 11 and 14 by a half pitch. Accordingly, the first winding 11 and the second winding 12 are not in contact in the same turn, and the distance L _{12 in} the wire radial direction between the first winding 11 and the second winding ₁₂ is the same in the same turn. It is longer than the distance L _{34 in} the wire diameter direction between the third winding 13 and the fourth winding 14. On the other hand, the third winding 13 and the fourth winding 14 are in contact with each other in the same turn, and the distance L ₃₄ in the radial direction between the third winding 13 and the fourth winding 14 is as described above. It is equal to the distances L ₁₃ , L ₁₄ , L ₂₃ , L ₂₄ .

Thus, according to the transformer component 100 of the present embodiment, the distances L ₁₃ , L ₁₄ , L ₂₃ , and L ₂₄ between the primary side winding and the secondary side winding in the same turn are substantially equal, and the same turn Since these are in contact with each other, the efficiency of magnetic coupling of each winding can be increased, and the frequency characteristics of the transformer can be improved. In addition, since the second layer windings 13 and 12 can be wound using the recess formed between the first layer windings 11 and 14 as a guide, the winding operation can be easily performed. It becomes.

  FIG. 6 is a schematic cross-sectional view showing a winding structure of a transformer component 600 according to a comparative example, and FIG. 7 is an enlarged schematic view of the same turn portion X. In the example shown in FIGS. 6 and 7, a pair of windings including the first and third windings 11 and 13 is a first layer, and a pair of windings including the second and fourth windings 12 and 14 is used. Is the second layer.

In the example shown in FIGS. 6 and 7, the distance between the primary side winding and the secondary side winding in the same turn is substantially equal for L ₁₃ , L ₂₃ , and L ₂₄ , but for distance L ₁₄ , these are the same. Longer than. That is, the distance between the primary side winding and the secondary side winding in the same turn is partially uneven, and a slight imbalance occurs in the magnetic coupling.

In contrast, in the transformer component 100 according to the embodiment, as described above, the distances L ₁₃ , L ₁₄ , L ₂₃ , and L ₂₄ between the primary winding and the secondary winding in the same turn are substantially equal. Thus, higher magnetic coupling can be obtained and good frequency characteristics can be obtained.

  FIG. 8 is a schematic cross-sectional view showing the winding structure of the transformer component 200 according to the second embodiment of the present invention, and FIG. 9 is an enlarged schematic view of the same turn portion X.

As shown in FIGS. 8 and 9, the transformer component 200 includes first and fourth windings in which third and second windings 13 and 12 provided in the second layer are provided in the first layer. 11 and 14 have winding structures respectively disposed immediately above. Thereby, like the transformer component 100 according to the first embodiment, the first winding 11 is in contact with the third and fourth windings 13 and 14 and the second winding 12 is the third and fourth. It is in contact with the windings 13 and 14. Further, in the same turn, the wire diameter direction of the distance L ₁₃ of the first winding 11 and the third winding 13, the distance between the first winding 11 diameter direction of the fourth winding 14 L ₁₄ The distance L _{23 in the} radial direction between the second winding 12 and the third winding 13 and the distance L _{24 in the} radial direction between the second winding 12 and the fourth winding 14 are substantially Are equal.

On the other hand, in the transformer component 200, the first winding 11 and the second winding 12 are not in contact in the same turn, and the third winding 13 and the fourth winding 14 are not in contact. For this reason, the distance L ₁₂ between the first winding 11 and the second winding 12 in the radial direction and the distance L ₃₄ between the third winding 13 and the fourth winding 14 in the same turn in the radial direction. Are equal to each other, and are all longer than the distances L ₁₃ , L ₁₄ , L ₂₃ , and L ₂₄ described above.

As described above, in the transformer component 200 according to the present embodiment, not only the distances L ₁₃ , L ₁₄ , L ₂₃ , and L ₂₄ between the primary side winding and the secondary side winding are equal to each other, the distance _{L 12} and the secondary winding are equal and the distance _{L 34} between. For this reason, compared with the transformer component 100 according to the first embodiment, the balance of magnetic coupling can be made more uniform.

  FIG. 10 is a schematic cross-sectional view showing a winding structure of a transformer component 300 according to the third embodiment of the present invention.

As shown in FIG. 10, the transformer component 300, characterized in that interchanging the positions of the third winding 13 of the fourth winding 14 of the transformer part 100 shown in FIG. 4 Yes. That is, a winding structure in which the first winding 11 and the third winding 13 are bifilar wound in the first layer, and the fourth winding 14 and the second winding 12 are bifilar wound in the second layer. Have. Since other configurations are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

Also in this embodiment, since the distances L ₁₃ , L ₁₄ , L ₂₃ , and L ₂₄ between the primary side winding and the secondary side winding in the same turn are substantially equal, high magnetic coupling is the same as in the transformer component 100. And good frequency characteristics can be obtained.

  FIG. 11 is a schematic cross-sectional view showing details of the winding structure of the transformer component 400 according to the fourth embodiment of the present invention.

  As shown in FIG. 11, the feature of the transformer component 400 is that the winding region of the magnetic core 10 is divided into two regions with the intermediate position (YY line) in the axial direction (longitudinal direction) of the core portion 10a as a boundary. The winding structure in each region is different from each other.

  First, in the half region (first winding region) S1 of the winding core portion 10a, the first and fourth windings 11 and 14 are bifilar wound on the first layer (inner peripheral side), and the second layer. The third and second windings 13 and 12 are bifilar wound on the (outer peripheral side). That is, this part has the same winding pattern as the transformer component 100 according to the first embodiment.

  On the other hand, in the remaining half region (second winding region) S2 of the winding core part 10a, the second and third windings 12 and 13 are bifilar wound in the first layer, and the second layer is in the second layer. The first and fourth windings 11 and 14 are bifilar wound. That is, it has a winding pattern in which the first layer and the second layer are interchanged.

  As described above, when the upper and lower winding layers are exchanged at the intermediate position, the wire lengths of the winding portions of the first and fourth windings 11 and 14 and the wires of the winding portions of the second and third windings. Since the lengths are substantially the same, the inductances of the windings can be matched, and the windings can be coupled in a balanced manner.

  FIG. 12 is a schematic perspective view showing an external structure of a transformer component 700 according to the fifth embodiment of the present invention, and FIG. 13 is an exploded perspective view of the transformer component 700. FIG. 14 is a cross-sectional view of the transformer component along the line AA in FIG.

  As shown in FIGS. 12 and 13, this transformer component 700 is characterized in that it includes a resin cover 16 for housing the drum core 10 </ b> A. Since other components are substantially the same as those of the transformer component 100 according to the first embodiment, the same components are denoted by the same reference numerals, and redundant description is omitted.

  The resin cover 16 is made of a nonmagnetic insulating resin such as polyimide. The resin cover 16 includes a winding core portion 16a, and flanges 16b and 16c are provided at both ends thereof. The resin cover 16 is slightly larger than the drum core 10A, and is configured to accommodate the drum core 10A. FIG. 12 shows a state where the drum core 10 </ b> A is accommodated in the resin cover 16.

Four terminal electrodes 21a to 24a are formed on the bottom surface of the flange portion 16b of the resin cover 16, and four terminal electrodes 21b to 24b (terminal electrodes 21b to 23b are not shown) are formed on the bottom surface of the flange portion 16c. Has been. Since the drum core 10A and the plate-like core 10B are made of the sintered body of Mn—Zn ferrite as described above, the permeability is high, but the fixed resistance is low and the conductivity is high. Therefore, the terminal electrode pairs (21a, 21b) to (24a, 24b) cannot be directly formed on the bottom surfaces of the flange portions 10b and 10c of the drum core 10A, and it is necessary to provide an insulating coating such as paraxylylene on the surface of the drum core 10A. is there. However, when the drum core 10A is housed in the resin cover 16, there is no need to form terminal electrode pairs on the drum core 10A, and these terminal electrode pairs can be formed on the bottom surfaces of the flange portions 16b and 16c of the resin cover 16. it can. Further, the terminal electrodes 21a to 24a, connection state between 21b~24b and winding 11 to 14 are as shown in FIGS.

As shown in FIG. 12 , part of the flanges 10 b and 10 c is exposed on the resin cover 16 even when the drum core 10 </ b> A is stored. This is because the height of the flange portions 10b and 10c of the drum core 10A is higher than the height inside the flange portions 16b and 16c of the resin cover 16. On the other hand, the height of the core part 10a of the drum core 10A is lower than the height inside the core part 16a of the resin cover 16, so that the core part 10a of the drum core 10A is within the core part 16a of the resin cover 16. Is completely stored.

  The corner portion 16d of the core portion 16a of the resin cover 16 is preferably chamfered in a round shape. The windings 11 to 14 are wound around the core portion 16a. However, if the corner portion 16d of the core portion 16 is a right angle, the winding may be damaged. Although it is conceivable to round the corner portion of the core portion 10a of the drum core 10A to form a round surface, the R processing of the sintered body of the magnetic material is not easy, and the corner portion may be largely missing. However, the resin cover 16 is made of a resin material, and R processing of the corner portion is extremely easy. When the corner portion 16d of the winding core portion 16a is rounded by such processing, the winding is not damaged. Therefore, a highly reliable transformer component can be realized. The chamfering of the corner portion 16d is not limited to a round surface and may be a flat surface.

The first to the positional relationship of the fourth winding 11 - 14 Figure 4 wound around the winding core 16a of the resin cover 16, Fig. 8, is as shown in FIG. 10 or 11, any pattern It may be adopted. When the windings 11 to 14 are wound around the core 16a of the resin cover 16, the leaf spring property of the vertical piece 16e of the resin cover 16 acts on the windings as shown in FIG. Therefore, by winding the winding with an appropriate force, the winding can always be in a moderately tensioned state, and the winding can be made difficult to collapse.

FIG. 15 is a graph showing the insertion loss (signal attenuation characteristic) of the transformer component, where the horizontal axis indicates the frequency (MHz) and the vertical axis indicates the signal attenuation (dB). FIG. 16 is a graph showing the common mode noise attenuation characteristics of the transformer components, where the horizontal axis represents frequency (MHz) and the vertical axis represents noise attenuation (dB). 15 and 16, graphs P ₁ is a measurement result of the transformer component 100 according to the first embodiment shown in FIG. 4, graphs P ₂ is a measurement result of the transformer component 600 according to the reference example shown in FIG. 6 There, the graph P ₃ is a measurement result in a case (not shown) which is the first to the fourth winding 11 through 14 one twisted wire.

As shown in FIG. 15, the signal attenuation characteristic of the transformer component 100 according to the first embodiment is better than that of the transformer component 600 according to the reference example, and the signal attenuation is small up to the high frequency band. Focusing on the cutoff frequency (-3 dB reduction), the cutoff frequency f _c1 of the graph P ₁ is about 520 MHz, the cutoff frequency f _c2 of the graph P ₂ is about 181 MHz, and the cutoff frequency f _c3 of the graph P ₃ is about 270 MHz. It has become. As described above, according to the present invention, it is possible to realize a transformer component that has less insertion loss than a conventional bifilar winding structure (P ₂ ) or a stranded wire structure (P ₃ ), and particularly has a low signal attenuation at high frequencies. Can do.

Further, as shown in FIG. 16, it can be seen that the common mode noise attenuation characteristics of the transformer component 100 according to the first embodiment are larger in noise attenuation than the transformer component 600 according to the reference example in almost the entire measurement frequency. For example, when attention is focused on the noise attenuation at 100 MHz, the noise attenuation of the graph _{P 1} is -18.2DB, noise attenuation graph _{P 2} is -13.4DB, noise attenuation graph _{P 3} is a -13.4DB It has become. Thus, according to the present invention, it is possible to realize a transformer component having better noise attenuation characteristics than the bifilar winding structure (P ₂ ) and the stranded wire structure (P ₃ ) according to the reference example.

  From the above results, it can be seen that the transformer component according to the present invention has the smallest signal attenuation and the largest noise attenuation.

  Although the present invention has been described based on the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. Needless to say, these are also included in the scope of the present invention.

  For example, in the above embodiment, the first winding 11 and the second winding 12 are connected via the first conductor pattern 35 on the printed circuit board 30, and the second conductor pattern 36 is used. Although the third winding 13 and the fourth winding 14 are connected, the present invention is not limited to such a configuration, and the windings 11 and 12 or the windings 13 and 14 are connected to each other. May be connected directly.

  Moreover, in the said embodiment, although drum core 10A is used as the magnetic core 10, this invention is not limited to a drum core, You may use a toroidal core and another core shape.

  In the above embodiment, the first to fourth windings 11 to 14 are sequentially connected to the first to fourth terminal electrode pairs 21a, 21b to 24a, 24b. The connection relationship with the terminal electrode is not particularly limited, and may be freely connected according to the purpose.

FIG. 1 is a schematic perspective view showing an external structure of a transformer component 100 according to a preferred first embodiment of the present invention. FIG. 2 is a schematic bottom view showing the structure of the bottom surface of the transformer component 100. FIG. 3 is an equivalent circuit diagram of the transformer component 100 in a state where it is mounted on the printed circuit board 30. FIG. 4 is a schematic cross-sectional view showing the winding structure of the transformer component 100. FIG. 5 is an enlarged schematic view of the same turn portion X shown in FIG. FIG. 6 is a schematic cross-sectional view showing a winding structure of a transformer component 600 according to a reference example. FIG. 7 is an enlarged schematic view of the same turn portion X shown in FIG. FIG. 8 is a schematic cross-sectional view showing a winding structure of a transformer component 200 according to the second embodiment of the present invention. FIG. 9 is an enlarged schematic view of the same turn portion X shown in FIG. FIG. 10 is a schematic cross-sectional view showing a winding structure of a transformer component 300 according to the third embodiment of the present invention. FIG. 11 is a schematic cross-sectional view showing a winding structure of a transformer component 400 according to the fourth embodiment of the present invention. FIG. 12 is a schematic perspective view showing an external structure of a transformer component 700 according to the fifth embodiment of the present invention. FIG. 13 is an exploded perspective view of the transformer component 700. 14 is a cross-sectional view of the transformer component 700 taken along line AA in FIG. FIG. 15 is a graph showing insertion loss (signal attenuation characteristics) of a transformer component. FIG. 16 is a graph showing noise attenuation characteristics of transformer parts. FIG. 17 is a schematic cross-sectional view showing a conventional winding structure using a drum core.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Magnetic core 10A Drum core 10B Plate core 10a Drum core core part 10b, 10c Drum core collar part 11 1st coil | winding 11a One end 11b of 1st coil | winding The other end 12 of 1st coil | winding 2nd coil | winding Line 12a Second winding one end 12b Second winding other end 13 Third winding 13a Third winding one end 13b Third winding other end 14 Fourth winding 14a Fourth One end 14b of the other winding 15A The other end 15A of the fourth winding Primary winding 15B Secondary winding 16 Resin cover 16a Resin cover core portion 16b, 16c Resin cover flange portion 16d Resin cover core portion Corner portion 16e Vertical pieces 21a, 21b of the core portion of the resin cover First terminal electrode pair 22a, 22b Second terminal electrode pair 23a, 23b Third terminal electrode pair 24a, 24b Fourth terminal electrode pair 30 Printed circuit board 30X mounting area 31a 31b 1st land pattern pair 32a, 32b 2nd land pattern pair 33a, 33b 3rd land pattern pair 34a, 34b 4th land pattern pair 35 1st conductor pattern 36 2nd conductor pattern 41 Toroidal core 42 Primary side winding 43 Secondary side winding 100 Transformer component 200 Transformer component 300 Transformer component 400 Transformer component 500 Conventional transformer component (pulse transformer)
600 Transformer parts by reference example (pulse transformer)
X Same turn part

Claims (10)

A magnetic core around which the first and second windings constituting the primary winding and the third and fourth windings constituting the secondary winding are wound;
Two winding layers comprising a first and a second winding layer,
The first winding layer has a configuration in which the first winding and the fourth winding are bifilar wound along the magnetic core, and the second winding layer includes the second winding layer, The third winding and the second winding have a configuration formed by bifilar winding along the magnetic core,
In the same turn, the distance in the radial direction between the first winding and the third winding, the distance in the radial direction between the first winding and the fourth winding, and the second A transformer component, wherein a distance in a wire diameter direction between the winding and the third winding and a distance in a wire diameter direction between the second winding and the fourth winding are substantially equal.   In the same turn, the first winding and the third winding are in contact with each other, the first winding and the fourth winding are in contact with each other, the second winding and the third winding are in contact with each other. The transformer component according to claim 1, wherein the second winding and the fourth winding are in contact with each other.   The distance in the radial direction between the first winding and the second winding in the same turn is greater than the distance in the radial direction between the first winding and the third winding in the same turn. The transformer component according to claim 1, wherein the transformer component is far away.   The distance in the radial direction between the first winding and the second winding in the same turn is substantially equal to the distance in the radial direction between the third winding and the fourth winding in the same turn. 4. The transformer component according to claim 3, wherein the transformer parts are equal to each other.   The first to fourth windings have the same number of turns, and a connection portion between the first winding and the second winding constitutes a midpoint of the primary winding, and the third winding 5. The transformer component according to claim 1, wherein a connection portion between the second winding and the fourth winding constitutes a midpoint of the secondary winding. 6. A magnetic core around which the first and second windings constituting the primary winding and the third and fourth windings constituting the secondary winding are wound;
Two winding layers comprising a first and a second winding layer,
In half of the core portion before Symbol magnetic cores, the first said to winding layers of the first and fourth windings are bifilar winding along the magnetic core, the second winding layer While the third and second windings are bifilar wound along the magnetic core, the second and third windings are formed on the first winding layer in the remaining half of the winding core. Is wound by a bifilar along the magnetic core, and the first and fourth windings are bifilar wound along the magnetic core in the second winding layer,
In the same turn, the distance in the radial direction between the first winding and the third winding, the distance in the radial direction between the first winding and the fourth winding, and the second A transformer component , wherein a distance in a wire diameter direction between the winding and the third winding and a distance in a wire diameter direction between the second winding and the fourth winding are substantially equal . The transformer component according to any one of claims 1 to 6 , wherein the magnetic core includes a drum core. Further comprising first and second wiring patterns formed on a printed circuit board on which the magnetic core is mounted;
The connection between the first winding and the second winding is performed via the first wiring pattern on the printed circuit board,
The transformer component according to claim 7 , wherein the connection between the third winding and the fourth winding is performed via the second wiring pattern on the printed circuit board. A resin cover for storing the drum core;
The transformer component according to claim 7 or 8 , wherein the first to fourth windings are wound around the drum core via the resin cover. The transformer part according to claim 9 , wherein a corner portion of the resin cover in contact with any one of the first to fourth windings is chamfered.

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