JP2011165709A - Transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer which meets the safety standard, has strong magnetic coupling between a primary winding and a secondary winding, and is reduced in size and height. <P>SOLUTION: A first primary winding 51 is wound around a first section 21A so as not to protrude vertically and horizontally from partitioning plates 22, 23. A first secondary winding 52 and a second secondary winding 53 are wound around a third section 21C so as not to protrude in vertical and horizontal directions from the partitioning plates 22, 23. A second primary winding 54 is formed of a three-layered insulation wire, and serially coupled with the first primary winding 51. The second primary winding 54 is wound around a second section 21B so as not to protrude in vertical and horizontal directions from the partitioning plates 22, 23, and one end and the other end of the second primary winding 54 are led through lead grooves 22a of the partitioning plate 22 to a terminal block 31, while facing the portions corresponding to the lateral edges which define the cross sectional shape of the substantially cylindrical part 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transformer, and in particular, a peripheral surface of a substantially cylindrical portion of a bobbin is partitioned into a plurality of sections in an axial direction of the substantially cylindrical portion, and a primary winding and a secondary winding are wound around separate sections. Regarding transformers.

  2. Description of the Related Art Conventionally, a power supply transformer having a configuration in which a primary winding and a secondary winding are wound around a bobbin is known. The bobbin has a substantially cylindrical part, and the circumferential surface of the substantially cylindrical part is partitioned into a plurality of sections by a partition plate in the axial direction of the substantially cylindrical part. Each section is wound with a primary winding and a secondary winding. In the axial direction of the substantially cylindrical portion, the partition plate has a predetermined thickness so that the primary winding and the secondary winding are wound. The windings are separated by a predetermined distance and meet safety standards. Such a transformer is described in, for example, Japanese Utility Model Laid-Open No. 5-48313 (Patent Document 1).

Japanese Utility Model Publication No. 5-48313

  However, in the conventional transformer described above, since the partition plate has a predetermined thickness so as to satisfy the safety standard, it is difficult to increase the magnetic coupling between the primary winding and the secondary winding. . In recent years, in particular, there has been an increasing demand for higher frequencies for transformers, and leakage inductances are required to have a smaller value. However, since the safety standards must be satisfied as described above, it is necessary to increase the magnetic coupling. It was difficult to reduce the leakage inductance value.

  In recent years, there has been an increasing demand for miniaturization and low profile for transformers, and bobbins have been miniaturized and low profile. If the bobbin is reduced in size and height, the space for winding the primary winding and the secondary winding is reduced. However, as described above, the partition plate must be secured with a predetermined thickness. Therefore, it has been difficult to secure a space for the winding. In other words, securing the partition plate with a predetermined thickness has hindered miniaturization and low profile.

  Therefore, an object of the present invention is to provide a transformer that satisfies safety standards, has high magnetic coupling between a primary winding and a secondary winding, and is reduced in size and height.

  In order to achieve the above object, the present invention includes a first section including a substantially cylindrical portion made of an insulating material, and an outer peripheral surface of the substantially cylindrical portion being arranged adjacent to each other in the axial direction of the substantially cylindrical portion. A bobbin having two sections and a third section, a terminal electrode provided on the bobbin, a core inserted in a space defined by the inner peripheral surface of the substantially cylindrical portion, and an insulating coating A primary winding made of a conductive wire and wound around the first section and having one end and the other end electrically connected to the terminal electrode, and a conductive wire covered with an insulating film and wound around the third section And one end and the other end of the secondary winding electrically connected to the terminal electrode, and the primary winding and the insulating coating having a higher insulating property than the insulating coating of the secondary winding. It consists of a conductor and is wound around the second section to configure the primary or secondary winding. It provides a transformer comprising a high-insulation windings, the to.

  A bobbin having a substantially cylindrical portion made of an insulating material, the outer peripheral surface of the substantially cylindrical portion having a first section, a second section, and a third section arranged adjacent to each other in the axial direction of the substantially cylindrical portion; A primary winding wound around the first section and having one end and the other end electrically connected to the terminal electrode, and a third wire consisting of a conductor covered with an insulating film. A secondary winding wound around the section and having one end and the other end electrically connected to the terminal electrode, and an insulating coating having higher insulation than the primary winding and the insulating coating of the secondary winding And a high-insulation winding which is wound around the second section and constitutes a primary winding or a secondary winding. The part that had become the dead space to be separated by a distance of It can be effectively utilized as a space for winding. For this reason, the request | requirement of size reduction and low profile is satisfied, and a primary winding or a secondary winding can be wound by desired winding frequency | count.

  In addition, since the primary winding or the high-insulation winding constituting the secondary winding is wound around the second section, the magnetic coupling between the primary winding and the secondary winding can be increased, thereby reducing the leakage inductance. The value of can be reduced to meet the demand for higher frequencies. Further, the leakage inductance value can be adjusted by adjusting the number of turns of the highly insulated winding. More specifically, the leakage inductance value can be reduced by increasing the number of turns, and the leakage inductance value can be increased by reducing the number of turns.

  Further, it is not necessary to make all the primary windings or all the secondary windings highly insulated windings. For this reason, although the high-insulation winding is expensive, the cost for manufacturing the transformer can be minimized. Further, it is possible to prevent the number of turns of the primary winding or the secondary winding from being reduced as much as possible without having to wind many high-insulation windings having a thick insulating coating and a large diameter.

  Here, the high-insulation winding is preferably made of a three-layer insulated wire. Since the high-insulation winding is made of a three-layer insulated wire, insulation can be achieved more reliably.

  In addition, partition plates extending in the circumferential direction of the substantially cylindrical portion are erected at the boundary between the first section and the second section and at the boundary between the second section and the three sections. Preferably, the first section and the second section are partitioned by the partition plate, and the second section and the 3 section are partitioned by the partition plate.

  At the boundary between the first section and the second section, and at the boundary between the second section and the third section, partition plates extending in the circumferential direction of the substantially cylindrical portion are respectively erected, so that the first section and the second section Since the section is partitioned by the partition plate, and the second section and the third section are partitioned by the partition plate, the primary winding, the secondary winding, and the high-insulation winding are wound around the substantially cylindrical portion. Can be made easy.

  Further, the cross-sectional shape of the substantially cylindrical part cut by a plane perpendicular to the axial direction of the substantially cylindrical part has a substantially rectangular shape having a pair of sides parallel to each other on the bottom side and the top side. Provided at the axial ends of the substantially cylindrical portion, the partition plates on the pair of sides are each formed with a leading groove extending in the axial direction of the substantially cylindrical portion, and the high insulation A portion near one end and a portion near the other end of the winding are passed through the lead-out groove from the second section, and are respectively pulled out in the axial direction of the substantially cylindrical portion so as to face the side, and are connected to the terminal electrode. It is preferable that they are electrically connected.

  The cross-sectional shape of the substantially cylindrical part cut by a plane perpendicular to the axial direction of the substantially cylindrical part is a substantially rectangular shape having a pair of sides parallel to each other, and the terminal electrode is formed of the substantially cylindrical part. A part of the partition plate on the pair of sides is provided with a leading groove extending in the axial direction of the substantially cylindrical part, and the part near the one end and the other end of the highly insulated winding The close part is passed through the lead-out groove from the second section, is pulled out in the axial direction of the substantially cylindrical part facing the side, and is electrically connected to the terminal electrode. It is possible to prevent the drawn portion from being drawn out on the bottom side or the top side and projecting in the direction separating the bobbin from the drawn portion in the direction connecting the bottom side and the top side. For this reason, it is possible to reduce the height in the direction connecting the bottom side and the top side.

  As described above, the present invention can provide a transformer that satisfies safety standards, has high magnetic coupling between the primary winding and the secondary winding, and is reduced in size and height.

The top view which shows the transformer by embodiment of this invention. The bottom view which shows the primary winding, secondary winding, and bobbin of the transformer by embodiment of this invention. The top view which shows the case of the transformer by embodiment of this invention. The top view which shows the core of the trans | transformer by embodiment of this invention. 1 is a circuit diagram showing a transformer according to an embodiment of the present invention.

  A transformer according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the transformer 1 includes a core 10, a bobbin 20, a conducting wire 50 (FIG. 2 and the like), and a case 40. In the following description, the upper direction in FIG. 1 is defined as the right direction and the lower direction is defined as the left direction. 1 is defined as the downward direction, and the direction from the back surface to the front surface of FIG. 1 is defined as the downward direction.

  As shown in FIG. 4, a pair of cores 10 having the same shape is provided. The core 10 is separated from the bottom wall portion 10A, a pair of side wall portions 10B extending so as to be separated from one end and the other end of the bottom wall portion 10A, and from the central portion of the bottom wall portion 10A. Each has a central wall portion 10C that extends, and has a substantially E-shape as a whole. The extended ends of the pair of side wall portions 10B of one core 10 are in contact with the extended ends of the side wall portions 10B of the other core 10 at their surfaces. The extending end of the central wall portion 10C of one core 10 does not contact the extending end of the central wall portion 10C of the other core 10 and is separated by a predetermined distance.

  As shown in FIG. 2, the bobbin 20 has a substantially cylindrical portion 21 which is made of an insulating resin and has a substantially cylindrical shape and is provided with terminal blocks 31 and 32 at both axial ends thereof.

  The substantially cylindrical portion 21 has a pair of parallel sides and a pair of parallel sides in which a cross-sectional shape cut by a plane perpendicular to the direction indicated by the arrow in FIG. 2 which is the axial direction of the substantially cylindrical portion 21 forms a pair of parallel straight lines. It has a substantially rectangular shape with a substantially rectangular shape having a straight top and bottom. A center wall portion 10C of the core 10 is inserted in a space defined by the inner peripheral surface of the substantially cylindrical portion 21 while being moved in the direction of the arrow in FIG. The length of the substantially cylindrical portion 21 in the axial direction is about 33 mm. A portion of the substantially cylindrical portion 21 corresponding to the bottom of the substantially rectangular shape is parallel to the surface of a mounting board (not shown) on which the transformer 1 is mounted.

  Partition plates 22 and 23 are provided on the peripheral surface of the substantially cylindrical portion 21. As shown in FIGS. 1 and 2, the partition plates 22 and 23 are erected in a plate shape over the entire circumference along the circumferential direction of the outer peripheral surface of the substantially cylindrical portion 21. The peripheral surface of the substantially cylindrical portion 21 is partitioned by the partition plates 22 and 23 into three sections of a first section 21A, a second section 21B, and a third section 21C in the axial direction of the substantially cylindrical portion 21.

  The length from the upper end of the partition plates 22 and 23 to the lower end of the partition plates 22 and 23 in the vertical direction is about 10 mm, and the distance between the partition plates 22 and 23 in the axial direction of the substantially cylindrical portion 21 is about 4 mm. .

  In a portion of the partition plate 22 that protrudes from the peripheral surface of the substantially cylindrical portion 21 in the left-right direction, a lead-out groove 22a is formed. The lead-out groove 22a extends in the axial direction of the substantially cylindrical portion 21 so as to connect the first section 21A and the second section 21B.

  The terminal blocks 31 and 32 are provided at one end and the other end of the substantially cylindrical portion 21 in the axial direction. The terminal blocks 31 and 32 are made of the same insulating resin as that of the substantially cylindrical portion 21, and are integrated with a portion corresponding to the aforementioned bottom side that defines the cross-sectional shape of the substantially cylindrical portion 21. The terminal blocks 31 and 32 respectively extend in a direction perpendicular to the axial direction of the substantially cylindrical portion 21. One terminal block 31 has terminal electrodes 61, 62, 63, 64, 65 made of five metal pins at predetermined intervals in the extending direction, respectively, from the other terminal block 32 to one terminal block 31. It extends from the terminal block 31 in the direction toward the front. The other terminal block 32 has terminal electrodes 71, 72, 73, 74, 75, 76, 77 made of seven metal pins at predetermined intervals in the extending direction, respectively. Is extended from the terminal block 32 in a direction toward the other terminal block 32. On the bottom surface of the terminal block 31, convex portions 31A, 31B, 31C, 31D, and 31E extending in the axial direction of the substantially cylindrical portion 21 are provided. On the bottom surface of the terminal block 32, convex portions 32A, 32B, 32C, 32D, 32E, 32F, and 32G extending in the axial direction of the substantially cylindrical portion 21 are provided.

  As shown in FIG. 2, the conductive wire 50 includes a first primary winding 51, a second primary winding 54, a first secondary winding 52, and a second secondary winding 53. have. The first primary winding 51, the first secondary winding 52, and the second secondary winding 53 are each made of a copper wire with an insulating coating such as urethane. The second primary winding 54 is a highly insulating coating having a higher insulating property than the insulating coating of the first primary winding 51, the first secondary winding 52, and the second secondary winding 53. It is comprised by the three-layer insulation wire which consists of a copper wire to which (1) was given.

  The first primary winding 51 is wound around the first section 21 </ b> A so as not to protrude in the vertical direction and the horizontal direction from the partition plates 22 and 23, and one end portion and the other end portion thereof are directed toward the terminal block 31. In the terminal block 31, it passes through between the convex portions 31B and 31C and between the convex portions 31C and 31D. The wound portions are wound around the terminal electrodes 62 and 64, respectively, and the wound portions are electrically connected to the terminal electrodes 62 and 64 by soldering or the like. In FIG. 2, for convenience of explanation, one end portion and the other end portion of the first primary winding 51 are illustrated as being wound around the terminal electrodes 62 and 64, respectively. The same applies to the first secondary winding 52, the second secondary winding 53, and the second primary winding 54.

  The first secondary winding 52 is wound around the third section 21 </ b> C so as not to protrude in the vertical direction and the horizontal direction from the partition plates 22 and 23, and one end portion and the other end portion thereof are directed toward the terminal block 32. The terminal block 32 is passed between the convex portions 32B and 32C and between the convex portions 32E and 32G. The wound portions are wound around the terminal electrodes 72 and 76, respectively, and the wound portions are electrically connected to the terminal electrodes 72 and 76 by soldering or the like.

  Similarly, the second secondary winding 53 has a first section wound on the third section 21 </ b> C around which the first secondary winding 52 is wound so as not to protrude in the vertical and horizontal directions from the partition plates 22 and 23. One end portion and the other end portion of the secondary winding 52 are wound around the secondary winding 52 and drawn toward the terminal block 32. In the terminal block 32, between the convex portion 32C and the convex portion 32D, the convex portion 32D and the convex portion 32D are convex. It is passed between the part 32E. The wound portions are wound around the terminal electrodes 73 and 75, respectively, and the wound portions are electrically connected to the terminal electrodes 73 and 75 by soldering or the like.

  The second primary winding 54 is wound around the second section 21 </ b> B so as not to protrude in the vertical direction and the horizontal direction from the partition plates 22 and 23, and one end portion and the other end portion of the second primary winding 54 are drawn out of the partition plate 22. 22a is passed through the terminal block 31 so as to face the portion corresponding to the above-mentioned side defining the cross-sectional shape of the substantially cylindrical portion 21. In the terminal block 31, the right side of the convex portion 31A, the convex portion It is passed to the left side of 31E. The wound portions are wound around the terminal electrodes 61 and 65, respectively, and the wound portions are electrically connected to the terminal electrodes 61 and 65 by soldering or the like. The second primary winding 54 is connected in series with the first primary winding 51 by electrically connecting the terminal electrode 61 and the terminal electrode 62 on a mounting substrate (not shown). One primary winding is formed together with the primary winding 51. The first section 21A, the second section 21B, and the third section 21C are not shown in FIG. 2 for convenience of explanation, but as shown in FIG. The insulating tape 81 is wound around the primary winding 54 and the second secondary winding 53 so as to cover them.

  As shown in FIG. 3, the case 40 has a substantially rectangular plate-like shape made of insulating resin. Two corner portions on one end side in the longitudinal direction of the case 40 having a substantially rectangular shape and a substantially central portion of the pair of long sides are cut out in a substantially rectangular shape. A rectangular through hole 40a whose longitudinal direction coincides with the longitudinal direction of the case 40 is formed at a substantially central position, and the substantially cylindrical portion 21 can be inserted into the through hole 40a. In a state where the substantially cylindrical portion 21 is inserted into the through hole 40a, the central wall portion 10C of the core 10 is inserted into the space defined by the inner peripheral surface of the substantially cylindrical portion 21 as described above. 1 is assembled.

  A wall portion that protrudes upward is provided in a portion of the case 40 that defines a portion corresponding to the left and right long sides of the through hole 40a. A protruding portion of the wall portion is provided with a flange portion 40B extending in parallel with the upper surface 40A of the case 40. The collar portion 40B is provided over the entire periphery of the through hole 40a.

  A bobbin 20 having a first section 21A, a second section 21B, and a third section 21C, in which the outer peripheral surface of the substantially cylindrical portion 21 is arranged adjacent to each other in the axial direction of the substantially cylindrical portion 21, and wound around the first section 21A The first primary winding 51, the first secondary winding 52 wound around the third section 21C, the second secondary winding 53, and the second section 21B. And a second primary winding 54 that constitutes the primary winding and is a dead space for separating the primary winding and the secondary winding by a predetermined distance. This portion can be effectively used as a space for winding the second primary winding 54. For this reason, the request | requirement of size reduction and low profile is satisfied, and a primary winding or a secondary winding can be wound by desired winding frequency | count.

  In addition, since the second primary winding 54 constituting the primary winding is wound around the second section 21B, the coupling between the primary winding and the secondary winding can be increased, thereby reducing the leakage inductance. The value can be reduced to meet the demand for higher frequencies. Further, the leakage inductance value can be adjusted by adjusting the number of turns of the second primary winding 54. More specifically, the leakage inductance value can be reduced by increasing the number of turns, and the leakage inductance value can be increased by reducing the number of turns.

  In addition, the entire primary winding or the entire secondary winding does not have to be a three-layer insulated wire that is a highly insulated winding. For this reason, although the three-layer insulated wire is expensive, the cost for manufacturing the transformer 1 can be suppressed as much as possible. Further, it is possible to prevent the number of turns of the primary winding or the secondary winding from being reduced as much as possible without having to wind many three-layer insulating wires having a thick insulating coating and a large diameter.

  Further, since the high-insulation winding is made of a three-layer insulated wire, insulation can be achieved more reliably. Since the first section 21A and the second section 21B are partitioned by the partition plate 22, and the second section 21B and the third section are partitioned by the partition plate 23, the primary winding, the secondary winding, and The winding of the second primary winding 54 around the substantially cylindrical portion 21 can be facilitated.

  The partition plate 22 is formed with a lead groove 22a extending in the axial direction of the substantially cylindrical portion 21, and a portion near one end and a portion near the other end of the second primary winding 54 are the second portion. Since the section 21B is passed through the lead-out groove 22a and is opposed to the side and is pulled out in the axial direction of the substantially cylindrical portion 21, the drawn-out portion of the second primary winding 54 is on the bottom side or the top side. It can be prevented that the portion pulled out and pulled out protrudes in the vertical direction away from the bobbin 20. For this reason, it is possible to reduce the height in the vertical direction.

  The transformer of the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, in the present embodiment, the second section 21B is wound with the three-layer insulation wire constituting the primary winding, but the three-layer insulation constituting the secondary winding without constituting the primary winding. A wire may be wound.

  Further, the high-insulation winding is not limited to a three-layer insulated wire. For example, instead of a three-layer insulated wire, a high-insulation winding made of a conductive wire covered with an insulating coating made of a highly insulating material having a higher insulating property than that of the primary winding and the secondary winding. An insulating material having insulation equivalent to that of the primary winding and the secondary winding may be used as an insulating coating by making it thicker than the insulating coating of the primary winding and the secondary winding. Highly insulated windings that have been used may be used.

  Further, the second primary winding 54 is connected in series with the first primary winding 51, but may be connected in parallel. Further, although the terminal blocks 31 and 32 are provided at both ends in the axial direction of the substantially cylindrical portion 21, the terminal blocks 31 and 32 are not limited to being provided at this position. Therefore, the terminal electrodes are also provided at both ends in the axial direction of the substantially cylindrical portion 21. It is not limited to being done.

  In addition, as the copper wires constituting the first primary winding, the second primary winding, the first secondary winding, and the second secondary winding, a plurality of copper wires were brought together. A thing may be used.

  Moreover, although the outer peripheral surface of the substantially cylindrical part 21 was partitioned into three sections of the first section 21A to the third section 21C, it is not limited to three and may be partitioned into more than that. Accordingly, there may be a plurality of sections around which the primary winding is wound, and a plurality of sections around which the secondary winding is wound. Even in this case, a highly insulated winding that constitutes the primary winding or the secondary winding between the section around which the primary winding is wound and the section around which the secondary winding is wound. It is set as the structure by which the section by which this was wound was provided.

  In the transformer of the present invention, in particular, the peripheral surface of the substantially cylindrical portion of the bobbin is partitioned into a plurality of sections in the axial direction of the substantially cylindrical portion, and the primary winding and the secondary winding are wound in separate sections. It is particularly useful in the field of transformers.

DESCRIPTION OF SYMBOLS 1 Transformer 10 Core 20 Bobbin 21 Substantially cylindrical part 22, 23 Partition plate 21A 1st section 21B 2nd section 21C 3rd section 22a Leading groove 61, 62, 63, 64, 65, 71, 72, 73, 74, 75 , 76, 77 Terminal electrode 51 First primary winding 54 Second primary winding 52 First secondary winding 53 Second secondary winding

Claims (4)

A bobbin having a substantially cylindrical part made of an insulating material, the outer peripheral surface of the substantially cylindrical part having a first section, a second section, and a third section arranged adjacent to each other in the axial direction of the substantially cylindrical part;
A terminal electrode provided on the bobbin;
A core inserted in a space defined by the inner peripheral surface of the substantially cylindrical portion;
A primary winding made of a conductive wire coated with an insulating coating, wound around the first section, and having one end and the other end electrically connected to the terminal electrode;
A secondary winding made of a conductive wire covered with an insulating coating, wound around the third section and having one end and the other end electrically connected to the terminal electrode;
The primary winding and the secondary winding are composed of a conductive wire coated with an insulating coating having a higher insulating property than that of the primary winding and the secondary winding, and are wound around the second section to constitute the primary winding or the secondary winding. And a transformer.   2. The transformer according to claim 1, wherein the high-insulation winding comprises a three-layer insulated wire.   Partition plates extending in the circumferential direction of the substantially cylindrical portion are respectively provided upright at the boundary between the first section and the second section and at the boundary between the second section and the three sections. The transformer according to claim 1 or 2, wherein the first section and the second section are partitioned by the partition plate, and the second section and the 3 section are partitioned by the partition plate. . The cross-sectional shape of the substantially cylindrical portion cut by a plane perpendicular to the axial direction of the substantially cylindrical portion is a substantially rectangular shape having a bottom side, a top side, and a pair of sides that are parallel to each other, and the terminal electrode is substantially the same. Provided at the axial end of the cylindrical portion,
A portion of the partition plate on the pair of side sides is formed with a leading groove extending in the axial direction of the substantially cylindrical portion,
A portion near one end and a portion near the other end of the high-insulation winding are passed through the lead-out groove from the second section, and are respectively pulled out in the axial direction of the substantially cylindrical portion so as to face the side. The transformer according to claim 3, wherein the transformer is electrically connected to the terminal electrode.

Images