JP2008177486A - Transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer which can reduce loss in operation of a transformer. <P>SOLUTION: In the transformer, a circuit is constituted of a primary side wiring block N1 which is formed by connecting in parallel one or a plurality of sets of wiring parts formed by connecting at least two or more coil patterns in series, and a secondary side wiring block N2 which is formed by connecting in parallel one or a plurality of sets of wiring parts formed by connecting at least two or more coil patterns in series and is electrically insulated from the primary side wiring block N1. A coil element 3 is laminated so as to minimize a distance between at least one or more coil patterns 2 in each of all the wiring parts constituting the primary side wiring block N1 and at least one or more coil patterns 2 in each of all the wiring parts constituting the secondary side wiring block N2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a planar type transformer formed by stacking substrates on which a coil pattern is formed.

  Conventionally, a planar type transformer formed by laminating substrates on which coil patterns are formed is known, for example, as disclosed in Patent Document 1. In this planar type transformer, each coil pattern constituting the primary side and the secondary side is alternately provided in each layer of the multilayer printed circuit board, and one end portions of the coil patterns on the primary side are connected to each other through a through hole. A predetermined number of coil elements are laminated on the transformer base, and terminal pins that are erected on the transformer base are inserted and arranged in through holes provided at the other ends of the coil patterns provided on the coil elements. By connecting a terminal pin and a through hole provided in the other end portion, the coil patterns on the same side between the coil elements are connected to each other. In one coil element, the primary side coil and the secondary side coil are connected. By alternately arranging the patterns to increase the magnetic coupling between the coil patterns, the occurrence of leakage magnetic flux is suppressed, and the loss during transformer operation is reduced.

  A conventional example of a planar transformer in which the above-described primary side coil pattern and secondary side coil pattern are laminated so as to be adjacent to each other will be described below. In this conventional example, as shown in FIG. 11A, concentric spiral coil patterns 2 made of a conductive material are formed on both surfaces of a substantially rectangular substrate 1 made of an insulating material, respectively. And a plurality of coil elements 3 (five in the drawing) laminated along the core 4 and a core 4 made of a magnetic material and surrounding at least a part of the plurality of coil elements 3. A circuit is configured by electrically connecting different coil patterns 2 via a plurality (10 in the drawing) of connecting terminal portions 5 provided. Further, each connection terminal portion 5 is provided with a rod-like external connection terminal 5a so as to be surface-mounted on another substrate (not shown) on which an electronic circuit is mounted via the external connection terminal 5a. It has become. In addition, between each coil element 3, the insulator 6 which consists of insulating resin is filled, and each coil element 3 is electrically insulated.

  As shown in FIG. 11A, the core 4 is disposed so as to cover the coil element 3 with a connecting core 40 having a substantially U-shaped cross section and an I-type core 41 having a substantially I-shaped cross section. Further, an intermediate leg core (not shown) protruding toward the I-type core 41 is integrally formed on the upper surface of the connecting core 40 in FIG. The pattern 2 is inserted through a through hole (not shown) passing through the center of the spiral. Thus, the core 4 magnetically couples the coil patterns 2 by forming a magnetic path at the center of the spiral of each coil pattern 2. A gap (not shown) is provided between the midfoot core and the I-type core 41, and the magnetic saturation of the core 4 is prevented by the gap.

In this conventional example, as shown in FIG. 11 (b), first to fourth winding portions formed by connecting three coil patterns N111 to N131, N112 to N132, N113 to N133, and N114 to N134 in series, respectively. A primary winding block N1 formed by connecting N11 to N14 in parallel, and a fifth winding portion N21 and a sixth winding portion formed by connecting three coil patterns N211 to N231 and N212 to N232 in series, respectively. A transformer is composed of a secondary winding block N2 which is formed by connecting N22 in parallel and electrically insulated from the primary winding block N1, and for example, as shown in FIG. The coil element 3 is laminated so that the coil pattern 2 of the secondary winding block N1 and the coil pattern 2 of the secondary winding block N2 are adjacent to each other, whereby the coil of the primary winding block N1 is laminated. Increasing the magnetic coupling between the coil pattern 2 turns 2 and the secondary winding block N2, so as to reduce the loss during transformer operation.
JP-A-5-135968

  However, in the above conventional example, for example, the coil patterns N111 to N131 of the first winding portion N11 and the coil patterns N211 to N231 of the fifth winding portion N21 are adjacent to each other, so that high magnetic coupling is ensured. However, since the distance in the stacking direction between the coil patterns N111 to N131 of the first winding portion N11 and the coil patterns N212 to N232 of the sixth winding portion N22 is large, magnetic coupling is performed. There is a problem that the loss during operation of the transformer cannot be sufficiently reduced.

  In order to solve this problem, for example, if the coil pattern 2 is configured to be laminated on one side of the substrate 1 for each winding part, the required coil elements 3 are reduced, so that the space between the winding parts is reduced. It is possible to increase the magnetic coupling. However, in this case, when the number of turns of each winding portion increases, there is a problem that the cross-sectional area of the coil pattern 2 decreases and the winding resistance increases, resulting in an increase in loss during transformer operation. In addition, it is conceivable to secure the cross-sectional area of the coil pattern 2 that is required by increasing the area of the substrate 1 in order to reduce the winding resistance. In this case, however, the transformer is increased in size and cost. There is a risk of inviting.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a transformer capable of reducing loss during transformer operation.

  In order to achieve the above object, a first aspect of the present invention provides a plurality of coil elements formed by forming a coil pattern made of a conductive material on both surfaces of a substrate made of an insulating material and being laminated along the thickness direction of the substrate. A planar type transformer comprising a core made of a magnetic material and surrounding at least a part of a plurality of coil elements, wherein a circuit is configured by electrically connecting different coil patterns to each other. A primary winding block formed by connecting one or more sets of winding parts formed by connecting two or more coil patterns in series, and a winding part formed by connecting at least two coil patterns in series. One or a plurality of sets are connected in parallel, and each of the winding portions is composed of a primary winding block and a secondary winding block that is electrically insulated from each other. Coil elements are laminated so that the distance between at least one coil pattern in the winding and at least one coil pattern in each of all winding portions constituting the secondary winding block is as small as possible. It is characterized by that.

  According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of laminated blocks comprising a plurality of coil elements each having a coil pattern arbitrarily selected one by one from all winding portions constituting the circuit are laminated. It is characterized by that.

  According to a third aspect of the present invention, in the second aspect of the present invention, the laminated block includes one or more laminated layers in which the coil pattern of the primary winding block and the coil pattern of the secondary winding block are adjacent to each other. It consists of parts.

  The invention according to claim 4 is the invention according to claim 2 or 3, wherein the order of lamination of the coil pattern of the primary winding block and the coil pattern of the secondary winding block in an arbitrary lamination block, and adjacent to the lamination block The laminated order of the coil pattern of the primary side winding block and the coil pattern of the secondary side winding block in the laminated block is different from each other.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the winding block having the larger winding current of the primary side winding block and the secondary side winding block is the winding More winding portions are connected in parallel than the winding block having the smaller current.

  The invention of claim 6 is the invention of any one of claims 1 to 5, wherein each winding part constituting the secondary side winding block is connected to a different load and at least at both ends of each winding part. Any one of them is electrically insulated from each other.

  The invention of claim 7 is the invention of any one of claims 1 to 6, comprising one or more coil patterns electrically insulated from either the primary winding block or the secondary winding block. The coil pattern of the third winding block is formed on a substrate different from the substrate on which the coil patterns of the primary side winding block and the secondary side winding block are formed. It is characterized by that.

  The invention according to claim 8 is the invention according to any one of claims 1 to 6, comprising one or more single-wire coils electrically insulated from either the primary winding block or the secondary winding block. The third winding block is arranged, and the third winding block is disposed between the plurality of coil elements and the core.

  The invention according to claim 9 is the invention according to claim 7 or 8, wherein the third winding block is provided in the core more than the primary winding block and the secondary winding block in the stacking direction of the coil elements. It is arranged on the side close to the gap.

  The invention of claim 10 is the invention according to any one of claims 1 to 9, wherein in each of the primary side winding block and the secondary side winding block, the portions having the same potential in each coil pattern are arranged. It is characterized by being electrically connected.

  The invention of claim 11 is the invention according to any one of claims 1 to 10, wherein the coil element has a coil pattern of the primary winding block and a coil pattern of the secondary winding block on both sides of the substrate. It is formed, and is characterized by being stacked in ascending or descending order of the voltage applied to the coil pattern.

  According to a twelfth aspect of the invention, in the invention of the eleventh aspect, the thickness of the substrate in the stacking direction is changed in accordance with a difference in voltage applied to each of the coil patterns formed on both surfaces of the substrate. .

  According to a thirteenth aspect of the present invention, in any one of the first to twelfth aspects of the present invention, there is provided a conductor pattern in which an electronic component made of a conductive material and constituting an electronic circuit is mounted on at least the outermost coil element substrate. It is formed.

  The invention of a fourteenth aspect is the invention according to any one of the first to thirteenth aspects, wherein in the winding block having the larger winding current of the primary side winding block and the secondary side winding block, the winding It is characterized in that at least a part of the coil pattern constituting the wire block is laminated on the outermost layer of the coil element.

  According to the first aspect of the present invention, at least one or more coil patterns in each of all the winding portions constituting the primary side winding block and each of all the winding portions constituting the secondary side winding block. The magnetic coupling between the coil pattern of the primary side winding block and the coil pattern of the secondary side winding block is enhanced by reducing the distance in the stacking direction between at least one coil pattern and the coil pattern as much as possible. Therefore, the loss during the operation of the transformer can be reduced.

  According to the invention of claim 2, by laminating a laminated block composed of a plurality of coil elements each formed with a coil pattern arbitrarily selected from each winding part one by one as a minimum unit, The distance between the furthest winding portions can be minimized, so that the magnetic coupling between the coil pattern of the primary winding block and the coil pattern of the secondary winding block can be enhanced.

  According to the invention of claim 3, the primary side is obtained by laminating as a minimum unit the laminated portion in which the coil pattern of the primary side winding block and the coil pattern of the secondary side winding block are adjacent to each other. The distance between the coil pattern of the winding block and the coil pattern of the secondary winding block can be reduced as much as possible, so that the magnetic coupling can be enhanced.

  According to the invention of claim 4, the stacking order of the coil pattern of the primary winding block and the coil pattern of the secondary winding block in each of the stack blocks and the stack blocks adjacent to the stack block is made different from each other. Thus, the distance between the coil pattern of the primary side winding block and the coil pattern of the secondary side winding block can be reduced as much as possible, and thus magnetic coupling can be enhanced.

  According to the invention of claim 5, the winding block having a larger winding current is configured by connecting a larger number of winding portions in parallel than the winding block having a smaller winding current. Therefore, the loss in the winding resistance during the operation of the transformer can be reduced.

  According to the invention of claim 7, the third winding block that is electrically insulated from both the primary side winding block and the secondary side winding block is provided, and the coil pattern of the third winding block is changed. Since the primary side winding block and the secondary side winding block are formed on a substrate different from the substrate on which the coil pattern is formed, for example, when the winding block for the control circuit is provided inside the transformer, the primary side Magnetic coupling between the coil pattern of the winding block and the coil pattern of the secondary winding block can be ensured.

  According to the eighth aspect of the present invention, for example, the winding block for the control circuit is formed of a single wire coil and disposed between the plurality of coil elements and the core, so that the space between the coil elements and the core can be freely set. Winding blocks can be arranged.

  According to the ninth aspect of the invention, the primary winding block and the secondary winding block are relatively provided by providing the third winding block on the side close to the core gap in the stacking direction of the coil elements. It can be arranged at a location away from the gap of the core, so that the influence of leakage magnetic flux from the gap can be suppressed, and loss during operation of the transformer can be reduced.

  According to the invention of claim 10, by electrically connecting portions having the same potential in each coil pattern, the current is concentrated in any winding part due to variations at the time of coil pattern formation and routing. Can be avoided.

  According to the invention of claim 11, the coil element is formed by forming the coil pattern of the primary winding block and the coil pattern of the secondary winding block on both surfaces of the substrate, respectively, and the voltage applied to the coil pattern. Therefore, the potential difference between adjacent coil patterns can be made as small as possible, and therefore the thickness of the insulator filled between the substrates can be reduced.

  According to the invention of claim 12, the thickness in the stacking direction of the substrate is changed by changing the thickness in the stacking direction of the substrate according to the difference in voltage applied to each of the coil patterns formed on both sides of the substrate. Can be thinned.

  According to the invention of claim 13, an electronic component constituting an electronic circuit can be mounted by forming a conductor pattern on a substrate of at least the outermost coil element, and a substrate for constituting the electronic circuit is separately provided. There is no need to provide it, and therefore the manufacturing cost can be reduced.

  According to the invention of claim 14, the heat dissipation can be improved by laminating at least a part of the coil pattern constituting the winding block having the larger winding current on the outermost layer, and therefore the temperature of the coil pattern. The rise can be suppressed.

  Hereinafter, each embodiment of the transformer according to the present invention will be described with reference to the drawings. In addition, since the basic structure of the transformer of each embodiment is common to the structure of the conventional transformer, the structure of the transformer is assumed to be the same as the structure of the conventional transformer unless otherwise specified in the following description. Description is omitted.

(Embodiment 1)
Hereinafter, Embodiment 1 will be described with reference to FIG. The present embodiment is characterized in the order of lamination of the coil pattern 2 formed on the substrate 1. Taking the circuit of the conventional example (see FIG. 11B) as an example, all of the elements constituting the primary winding block N1 are exemplified. Between at least one or more coil patterns 2 in each of the winding portions N11 to N14 and at least one or more coil patterns 2 in each of all the winding portions N21 to N22 constituting the secondary winding block N2. The coil elements 3 are stacked so that the distance in the stacking direction (hereinafter simply referred to as “distance”) is as small as possible.

  Specifically, as shown in FIG. 1, the coil pattern N111 of the first winding part N11, the coil pattern N211 of the fifth winding part N21, the coil pattern N112 of the second winding part N12, the sixth The coil element 3 is laminated so that the coil pattern N212 of the winding part N22 and the coil pattern N121 of the first winding part N11 are in this order, and a part of the first winding part N11 and the fifth winding part N11 Part of the winding part N21 is adjacent, part of the second winding part N12 and part of the fifth winding part N21 are adjacent, part of the second winding part N12 and A part of the sixth winding part N22 is adjacent to a part of the first winding part N11 and a part of the sixth winding part N22. Furthermore, the coil pattern N113 of the third winding part N13, the coil pattern N221 of the fifth winding part N21, the coil pattern N114 of the fourth winding part N14, the coil pattern N222 of the sixth winding part N22, By laminating the coil elements 3 so that the coil pattern N123 of the third winding part N13 is in the order, a part of the third winding part N13 and a part of the fifth winding part N21 are adjacent to each other. In addition, a part of the fourth winding part N14 and a part of the fifth winding part N21 are adjacent to each other, and a part of the fourth winding part N14 and a part of the sixth winding part N22 Are adjacent to each other, and a part of the third winding part N13 and a part of the sixth winding part N22 are adjacent to each other. Note that the stacking order of the remaining coil patterns 2 shown in FIG. 1 is an example, and other stacking orders may be used.

  Accordingly, a part of each of the winding parts N11 to N14 of the primary side winding block N1 and a part of all of the winding parts N21 and N22 of the secondary side winding block N2 are adjacent to each other. Therefore, the magnetic coupling between the coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2 as compared with the conventional example (see FIG. 11C). Therefore, loss during operation of the transformer can be reduced.

  In the present embodiment, a part of each of all the winding parts N11 to N14 of the primary side winding block N1 and a part of each of all the winding parts N21, N22 of the secondary side winding block N2. Are adjacent to each other. However, they are not necessarily adjacent to each other. The coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2 It suffices if the distance between can be made as small as possible.

(Embodiment 2)
Hereinafter, Embodiment 2 will be described with reference to FIG. The present embodiment is characterized in that a plurality of laminated blocks each made of a plurality of coil elements 3 each having a coil pattern 2 arbitrarily selected from each winding portion are formed. Specifically, taking the circuit of the conventional example (see FIG. 11B) as an example, a total of six coil patterns N111, N112, N113, N114, one from each of the winding portions N11 to N22, respectively. N211 and N212 are selected, and a laminated block A is constituted by three coil elements 3 in which these six coil patterns N111 to N212 are respectively formed on both surfaces of three substrates 1 (FIGS. 2A and 2B). )reference). The remaining coil pattern 2 also constitutes a laminated block in the same manner as described above, but in this embodiment, only the laminated block A will be described, and description of the other laminated blocks will be omitted.

  Here, for example, without considering the configuration of the laminated block as in the prior art, the laminated pattern is such that the coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2 are adjacent to each other. In this case, as shown in FIG. 2C, the minimum value of the distance between the first winding portion N11 and the sixth winding portion N22, that is, the distance between the coil pattern N131 and the coil pattern N212. Therefore, sufficient magnetic coupling cannot be ensured between the first winding portion N11 and the sixth winding portion N22. On the other hand, when the laminated block A is configured as described above, the minimum value of the distance between the first winding portion N11 and the sixth winding portion N22, that is, the coil pattern N111 and the coil pattern. The distance to N212 is shortened, and sufficient magnetic coupling can be ensured.

  As described above, by laminating a laminated block composed of a plurality of coil elements 3 each having a coil pattern 2 arbitrarily selected from each of the winding portions N11 to N22 as a minimum unit, it is most distant from each other. The distance between the coil patterns 2 of each winding part can be minimized, so that the magnetic coupling between the coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2 is possible. Can be increased.

  Note that, as in the present embodiment, the laminated block includes one or more laminated portions that are laminated so that the coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2 are adjacent to each other. It is desirable to be configured as a minimum unit (see FIG. 2B). With this configuration, the distance between the coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2 can be reduced as much as possible, and the magnetic coupling can be enhanced. .

(Embodiment 3)
Hereinafter, Embodiment 3 will be described with reference to FIG. In the present embodiment, the stacking order of the coil pattern 2 in the stacking block B (see FIG. 3A) adjacent to the stacking block A of Embodiment 2 is different from the stacking order of the coil pattern 2 in the stacking block A. There is a feature. Specifically, as shown in FIG. 3B, in the laminated block A, the coil pattern N111 of the first winding portion N11, the coil pattern N211 of the fifth winding portion N21, and the second winding portion. Coil pattern 2 is laminated in the order of coil pattern N112 of N12, coil pattern N113 of third winding portion N13, coil pattern N212 of sixth winding portion N22, and coil pattern N114 of fourth winding portion N14. In the laminated block B, the coil pattern N121 of the first winding part N11, the coil pattern N222 of the sixth winding part N22, the coil pattern N122 of the second winding part N12, and the third winding part Coil pattern 2 in the order of coil pattern N123 of N13, coil pattern N221 of fifth winding portion N21, and coil pattern N124 of fourth winding portion N14 It is stacked.

  Here, the first winding portion N11 and the fifth winding portion N21, the second winding portion N12 and the fifth winding portion N21, the third winding portion N13 and the sixth winding portion N22. The coil pattern 2 is adjacent between the fourth winding portion N14 and the sixth winding portion N22, but the first winding portion N11, the sixth winding portion N22, and the second winding portion. A coil pattern 2 is provided between the line portion N12 and the sixth winding portion N22, between the third winding portion N13 and the fifth winding portion N21, and between the fourth winding portion N14 and the fifth winding portion N21. Are not adjacent. Therefore, by setting the stacking order of the coil pattern 2 of the stacked block B as described above, the first winding portion N11 and the sixth winding portion N22, and the second winding portion N12 and the sixth winding. Since the coil pattern 2 is adjacent to the portion N22, the third winding portion N13 and the fifth winding portion N21, and the fourth winding portion N14 and the fifth winding portion N21, further magnetic coupling is achieved. Can be increased.

(Embodiment 4)
Hereinafter, Embodiment 4 will be described with reference to FIG. In the present embodiment, in the winding block having the larger winding current of the primary winding block N1 and the secondary winding block N2, the winding portion is arranged more than the winding block having the smaller winding current. It is characterized by many parallel connections. Specifically, when the winding current of the primary winding block N1 is larger, as shown in FIG. 4A, two coil patterns N111 to N121 and N112 to N122 are connected in series, respectively. A primary winding block N1 is formed by connecting the first winding portion N11 and the second winding portion N12 in parallel, and a third winding formed by connecting two coil patterns N211 and N221 in series. Part N21 constitutes the secondary winding block N2.

  As described above, by increasing the number of windings connected in parallel in the winding block having the larger winding current, the winding resistance can be reduced, and therefore the loss in the winding resistance during the transformer operation is reduced. Can be reduced.

  By the way, in this embodiment, as shown in FIG.4 (b), the coil pattern N111 of the 1st winding part N11, the coil pattern N211 of the 3rd winding part N21, and the coil of the 2nd winding part N12 The coil pattern 2 is laminated in the order of the pattern N112, the coil pattern N121 of the first winding portion N11, the coil pattern N221 of the third winding portion N21, and the coil pattern N122 of the second winding portion N12. By laminating in this way, the coil pattern 2 of the first winding portion N11 is adjacent to any coil pattern 2 of the third winding portion N21, and the coil pattern 2 of the second winding portion N12 is Adjacent to any coil pattern 2 of the third winding portion N21. Therefore, the distance between the coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2 can be made as small as possible, and the magnetic coupling can be enhanced.

  Furthermore, the stacking order as shown in FIG. 4C in consideration of the voltage applied to each coil pattern 2, that is, the coil pattern N111 of the first winding portion N11 and the coil pattern of the third winding portion N21. N211, coil pattern N122 of second winding part N12, coil pattern N112 of second winding part N12, coil pattern N221 of third winding part N21, coil pattern N121 of first winding part N11 The coil patterns 2 may be stacked in order. By laminating in this way, the coil pattern N112 on the high voltage side of the second winding portion N12 and the coil pattern N211 on the low voltage side of the third winding portion N21 are adjacent to each other, and the second winding portion N12 Since the coil pattern N122 on the low voltage side and the coil pattern N211 on the high voltage side of the third winding portion are stacked adjacent to each other, the coil pattern 2 on the high voltage side and the coil pattern 2 on the low voltage side and the secondary of the primary coil block N1 are stacked. Magnetic coupling can be further enhanced between the high-voltage side and low-voltage side coil patterns 2 of the side winding block N2.

  When the winding current of the secondary winding block N2 is larger, as shown in FIG. 4D, the first winding portion N11 formed by connecting two coil patterns N111 and N121 in series. The primary winding block N1 is constituted by the second winding portion N21 and the third winding portion N22 formed by connecting two coil patterns N211 to N221 and N212 to N222 in series. The secondary winding block N2 may be configured in this case. In this case, the coil pattern 2 is laminated in the order of the coil pattern 2 and the secondary winding of the primary winding block N1, as shown in FIG. It is desirable to make the distance between the line block N2 and the coil pattern 2 as small as possible.

(Embodiment 5)
Hereinafter, Embodiment 5 will be described with reference to FIG. In the present embodiment, as shown in FIG. 5A, the connection of the two coil patterns N211 and N221 of the third winding part N21 of the secondary winding block N2 connected in series in the fourth embodiment. The ends are electrically insulated, and the first load circuit 8a is connected to the coil pattern N211 and the second load circuit 8b is connected to the coil pattern N221. In addition, the lamination order of the coil pattern 2 is the same as that of Embodiment 4 (refer FIG.5 (b)).

  Here, when the coil pattern 2 of the primary side winding block N1 and the coil pattern 2 of the secondary side winding block N2 are alternately laminated as in the prior art, as shown in FIG. The distance between the coil patterns N111, N121 of the first winding part N11 and the coil pattern N221 of the secondary winding block N2, and the coil patterns N112, N122 of the second winding part N12 and the secondary side Since the distance from the coil pattern N211 of the winding block N2 is large, the magnetic coupling cannot be secured sufficiently. In addition, the coil patterns N111 and N121 of the first winding part N11 are arranged at positions away from the gap 4a of the core 4, and the coil patterns N112 and N122 of the second winding part N12 are close to the gap 4a of the core 4. Since the first winding portion N11 and the second winding portion N12 are arranged at different locations, the inductance value of the coil pattern 2 (hereinafter referred to as “L value”) varies, and the first load circuit There is a problem that it is not possible to supply power as designed in the transformer to the 8a and the second load circuit 8b.

  On the other hand, in the case of the stacking order of the coil pattern 2 of this embodiment, as shown in FIG. 5B, the coil pattern 2 of the primary winding block N1 and the coil of the secondary winding block N2 are used. Magnetic coupling can be enhanced by making the distance between the patterns 2 as small as possible. Further, the coil pattern N111 of the first winding part N11 and the coil pattern N112 of the second winding part N12 are arranged at a position away from the gap 4a, and the coil pattern N121 and the second coil pattern N121 of the first winding part N11 are arranged. Since the coil pattern N122 of the winding part N12 is arranged at a location close to the gap 4a, variation in the L value of the coil pattern 2 in the first winding part N11 and the second winding part N12 can be suppressed. In addition, the first load circuit 8a and the second load circuit 8b can be supplied with power as designed in the transformer.

(Embodiment 6)
Hereinafter, the sixth embodiment will be described with reference to FIG. This embodiment is characterized in that it has a third winding block N3 that is electrically insulated from both the primary winding block N1 and the secondary winding block N2. The third winding block N3 is used as, for example, a power transformer for a control circuit that controls a voltage supplied from a power source. As shown in FIG. 6A, the primary winding block N1 and the secondary winding block N3 are used. It consists of coil elements 3 each having a coil pattern 2 formed on both sides of the substrate 1 different from the substrate 1 on which the coil pattern 2 of the side winding block N2 is formed. The configurations of the primary side winding block N1 and the secondary side winding block N2 are the same as those in the fifth embodiment, and therefore the description and the figure number of the coil pattern 2 of each winding block are omitted here.

  As described above, the coil pattern 2 of the third winding block N3 is formed on the substrate 1 different from the substrate 1 on which the coil pattern 2 of the primary winding block N1 and the secondary winding block N2 is formed. Thus, it is possible to prevent magnetic coupling between the primary side winding block N1 and the secondary side winding block N2 and the third winding block N3 as much as possible. Therefore, even when the third winding block N3 is provided inside the transformer, the magnetic coupling between the coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2 is ensured. be able to.

  Further, in the present embodiment, the primary winding block N1 and the secondary winding block N2 are disposed at a location away from the gap 4a of the core 4, and the third winding block N3 is disposed from the gap 4a of the core 4. I try to place it close. By doing in this way, the influence which the leakage magnetic flux from the gap 4a of the core 4 has on the primary side winding block N1 and the secondary side winding block N2 can be suppressed, and the loss at the time of transformer operation can be reduced. Can do.

  As shown in FIG. 6B, the third winding block N3 is composed of a bobbin 9 around which the single wire coil 20 is wound, and the bobbin 9 is arranged between the coil element 3 and the core 4. It doesn't matter. In this case, the third winding block N3 can be freely arranged in the space between the coil element 3 and the core 4. Further, the manufacturing cost can be reduced as compared with the case where the third winding block N3 is configured by increasing the number of laminated coil elements 3.

(Embodiment 7)
Hereinafter, Embodiment 7 will be described with reference to FIG. The present embodiment is characterized in that, in each of the primary side winding block N1 and the secondary side winding block N2, the portions having the same potential in each coil pattern 2 are electrically connected to each other.

  As shown in FIG. 7, the circuit of the present embodiment includes a first winding portion N11 in which two coil patterns N111 and N121 are connected in series to a primary winding block N1, and two coil patterns N112 and N122. The second winding part N12 connected in series is connected in parallel, and the secondary winding block N2 is constituted by a third winding part N21 in which two coil patterns N211 and N221 are connected in series and two coils. A fourth winding part N22 in which the patterns N212 and N222 are connected in series is connected in parallel. It is assumed that the number of turns of the coil pattern 2 is the same for each winding block.

  Here, in the present embodiment, one end on the low voltage side of the coil pattern N111 of the first winding portion N11 and the one end on the low voltage side of the coil pattern N112 of the second winding portion N12 having the same potential, the first winding. One end on the high voltage side of the coil pattern N121 of the wire portion N11, one end on the high voltage side of the coil pattern N122 of the second winding portion N12, one end on the low voltage side of the coil pattern N211 of the third winding portion N21, and the fourth One end on the low voltage side of the coil pattern N212 of the coil portion N22, one end on the high voltage side of the coil pattern N221 of the third coil portion N21 and one end on the high voltage side of the coil pattern N222 of the fourth coil portion N22 are electrically connected. Connected.

  As described above, by electrically connecting parts having the same potential in each winding block, the potential of each part is stabilized, and any current is generated due to variations at the time of coil pattern 2 formation and routing. Concentration on the winding portion can be avoided. The coil pattern 121 of the first winding part N11, the coil pattern N122 of the second winding part N12, the coil pattern N221 of the third winding part N21, and the coil pattern N222 of the fourth winding part N22 When one end on the low voltage side is grounded, it is desirable to arrange the coil element 3 having the coil pattern 2 inside.

(Embodiment 8)
Hereinafter, Embodiment 8 will be described with reference to FIG. As shown in FIG. 8A, the circuit of the present embodiment includes a first winding portion N11 in which two coil patterns N111 and N121 are connected in series to a primary winding block N1, and two coil patterns N112. , N122 connected in series with the second winding part N12 connected in parallel, and the secondary winding block N2 is connected to the two coil patterns N211, N221 in series, the third winding part N21, A fourth winding portion N22 in which two coil patterns N212 and N222 are connected in series is connected in parallel.

  Here, in this embodiment, the coil pattern 2 of the primary side winding block N1 and the secondary side winding block N2 is formed on both surfaces of the substrate 1 of each coil element 3 and applied to the coil pattern 2. The coil pattern 2 is laminated in order of increasing voltage. Specifically, as shown in FIG. 8B, the coil pattern N111 of the first winding portion N11 connected to the high-voltage side of the power source is provided on both surfaces of the uppermost substrate 1 in FIG. A coil pattern N211 of the third winding portion N21 connected to the high voltage side of the load is formed, and a second pattern connected to the high voltage side of the power source is formed on both surfaces of the second substrate 1 from the top in FIG. A coil pattern N112 of the winding part N12 and a coil pattern N212 of the fourth winding part N22 connected to the high voltage side of the load are formed. On both surfaces of the second substrate 1 from the bottom in the figure, the coil pattern N121 of the first winding part N11 connected to the low voltage side of the power source and the third winding part connected to the low voltage side of the load, respectively. A coil pattern N221 of N21 is formed, and on both surfaces of the lowermost substrate 1 in the same figure, the coil pattern N122 of the second winding portion N12 connected to the low voltage side of the power source and the low voltage side of the load are connected. A coil pattern N222 of the fourth winding portion N22 is formed.

  By laminating the coil pattern 2 as described above, the potential difference between the coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2 on each substrate 1 can be minimized. . Therefore, since the thickness in the stacking direction of the insulator 6 filled between the substrates 1 can be reduced, the coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2 are used. And the transformer can be designed to be small. Further, when the transformer is not designed to be small, the thickness of each substrate 1 in the stacking direction can be reduced and the thickness of each coil pattern 2 in the stacking direction can be increased, so that the winding resistance can be reduced. Is possible.

  As shown in FIG. 8C, the smaller the potential difference between the coil pattern 2 of the primary winding block N1 and the coil pattern 2 of the secondary winding block N2, the smaller the potential in the stacking direction of the substrate 1 becomes. The thickness may be reduced. In this case, the same effect as described above can be obtained.

(Embodiment 9)
Hereinafter, Embodiment 9 will be described with reference to FIG. In the present embodiment, as shown in FIG. 9, a conductor pattern 2 a on which a plurality of electronic components 10 made of a conductive material and constituting an electronic circuit are mounted on the upper surface of the substrate 1 of the outermost coil element 3 It is formed integrally with the formed coil pattern 2. Therefore, the substrate 1 of the coil element 3 and a general electronic circuit substrate can be used together, and it is not necessary to separately provide an electronic circuit substrate, and the manufacturing cost can be reduced. Further, in the present embodiment, since the external connection terminal 5a for surface mounting is unnecessary, the manufacturing cost can be further reduced. Furthermore, it is not necessary to consider the loss due to the contact resistance of the external connection terminal 5a during surface mounting.

  By the way, in each of the above embodiments, at least a part of the coil pattern 2 of the winding block having the larger winding current of the primary winding block N1 and the secondary winding block N2 is used as the outermost coil element 3. It is desirable to form it on the substrate 1. By doing in this way, since the coil pattern 2 of the winding block which has a large winding current, that is likely to generate heat, touches the outside air, the heat dissipation can be improved, and the temperature rise of the coil pattern 2 can be suppressed. Can do. Further, the periphery of the transformer is filled with silicon for heat dissipation or the like, or as shown in FIG. 10, the insulator 7a is interposed on the coil pattern 2 formed on the substrate 1 of the outermost coil element 3. It is desirable to provide the metal heat dissipating body 7 because the heat dissipating property can be further improved.

It is sectional drawing of the board | substrate which shows an example of the lamination | stacking order of the coil pattern which shows the transformer of Embodiment 1 of this invention. 5A and 5B are diagrams illustrating a transformer according to a second embodiment of the present invention, where FIG. 5A is a circuit diagram, FIG. 5B is a cross-sectional view of a substrate illustrating an example of the stacking order of coil patterns, and FIG. It is sectional drawing of the board | substrate which shows an example of order. It is a figure which shows the transformer of Embodiment 3 of this invention, (a) is a circuit diagram, (b) is a partial cross section figure of the board | substrate which shows an example of the lamination order of a coil pattern. It is a figure which shows the transformer of Embodiment 4 of this invention, (a) is a circuit diagram at the time of connecting the primary side coil | winding part in parallel, (b) is the case where the primary side coil | winding part is connected in parallel (C) is a cross-sectional view of the substrate when stacked in consideration of the applied voltage, (d) is a circuit diagram when the secondary windings are connected in parallel, (e ) Is a cross-sectional view of the substrate when the secondary windings are connected in parallel. It is a figure which shows the transformer of Embodiment 5 of this invention, (a) is a circuit diagram, (b) is a partial cross section figure, (c) is a partial cross section figure which shows a prior art example. It is a figure which shows the transformer of Embodiment 6 of this invention, (a) is sectional drawing which shows the case where the coil pattern of the 3rd winding block is formed in the board | substrate, (b) is a 3rd winding block by a single wire It is sectional drawing which shows the case where it comprises with a coil. It is a circuit diagram which shows the transformer of Embodiment 7 of this invention. FIG. 10 is a diagram illustrating a transformer according to an eighth embodiment of the present invention, where (a) is a circuit diagram, (b) is a cross-sectional view of the substrate showing a case where the thickness in the stacking direction of the substrates is the same, and (c) is a diagram of the substrate It is sectional drawing of a board | substrate which shows the case where the thickness of a lamination direction differs for every board | substrate. It is a whole perspective view showing a transformer of Embodiment 9 of the present invention. It is sectional drawing which shows the case where a heat radiator is provided on the board | substrate of the coil element of the outermost layer. It is a figure which shows the conventional trans | transformer, (a) is a whole perspective view, (b) is a circuit diagram, (c) is sectional drawing of the board | substrate which shows an example of the lamination | stacking order of a coil pattern.

Explanation of symbols

1 Substrate 2 Coil pattern 3 Coil element 4 Core N1 Primary winding block N2 Secondary winding block

Claims (14)

  A coil pattern made of a conductive material is formed on both surfaces of a substrate made of an insulating material, and a plurality of coil elements are laminated along the thickness direction of the substrate, and at least part of the plurality of coil elements made of a magnetic material is surrounded A planar type transformer comprising a core and configured by electrically connecting different coil patterns to each other, wherein the circuit includes at least two coil patterns connected in series Primary winding block formed by connecting one or more sets in parallel and one or more sets of winding portions formed by connecting at least two coil patterns in series. A secondary winding block electrically insulated from the block, and at least one coil pattern in each of all winding portions constituting the primary winding block; Transformer, wherein the coil element to be as small as possible the distance between the at least one coil pattern in all of the winding sections each constituting the next winding blocks are stacked.   2. The transformer according to claim 1, wherein a plurality of laminated blocks each made of a plurality of coil elements each having a coil pattern arbitrarily selected from all winding portions constituting the circuit are laminated.   3. The laminated block according to claim 2, wherein the laminated block includes one or a plurality of laminated portions laminated so that the coil pattern of the primary winding block and the coil pattern of the secondary winding block are adjacent to each other. Trance.   The stacking order of the coil pattern of the primary winding block and the coil pattern of the secondary winding block in an arbitrary stacking block, and the coil pattern and secondary of the primary winding block in the stacking block adjacent to the stacking block 4. The transformer according to claim 2, wherein the order of stacking the coil patterns of the side winding blocks is different from each other.   Of the primary side winding block and the secondary side winding block, the winding block having the larger winding current has more winding portions connected in parallel than the winding block having the smaller winding current. The transformer according to any one of claims 1 to 4, wherein the transformer is formed.   The winding portions constituting the secondary winding block are connected to different loads, and at least one of both ends of each winding portion is electrically insulated from each other. 6. The transformer according to any one of 5 above.   A coil pattern of a third winding block having a third winding block comprising one or a plurality of coil patterns electrically insulated from both the primary winding block and the secondary winding block; The transformer according to any one of claims 1 to 6, wherein the transformer is formed on a substrate different from a substrate on which a coil pattern of the primary side winding block and the secondary side winding block is formed. .   The first winding block and the secondary winding block have a third winding block composed of one or more single-wire coils that are electrically insulated from each other, and the third winding block includes a plurality of third winding blocks. The transformer according to any one of claims 1 to 6, wherein the transformer is disposed between the coil element and the core.   The third winding block is disposed closer to the gap provided in the core than the primary winding block and the secondary winding block in the stacking direction of the coil elements. The transformer according to 7 or 8.   10. Each of the primary side winding block and the secondary side winding block is formed by electrically connecting portions having the same potential in each coil pattern. The transformer according to item 1.   The coil element is formed by forming a coil pattern of a primary winding block and a coil pattern of a secondary winding block on both surfaces of a substrate, respectively, and is stacked in ascending or descending order of voltage applied to the coil pattern. The transformer according to claim 1, wherein the transformer is any one of the above.   The transformer according to claim 11, wherein the thickness of the substrate in the stacking direction is changed in accordance with a difference in voltage applied to each of the coil patterns formed on both surfaces of the substrate.   13. The conductor pattern according to claim 1, wherein a conductor pattern on which an electronic component made of a conductive material and constituting an electronic circuit is mounted is formed on at least the outermost coil element substrate. Trance. In the winding block having the larger winding current among the primary side winding block and the secondary side winding block, at least a part of the coil pattern constituting the winding block is laminated on the outermost layer of the coil element. The transformer according to claim 1, wherein the transformer is any one of the above.

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