JP5120782B2 - High voltage transformer - Google Patents

Description

  The present invention relates to a high-voltage transformer, and more particularly to a high-voltage transformer that intentionally generates a leakage inductance between a primary winding and a secondary winding.

  A substantially cylindrical bobbin having a substantially linear shape is provided so as to wrap a substantially straight core, and a primary winding and a secondary winding each made of a conductive wire coated with insulation are respectively connected to the bobbin. Conventionally, a high-voltage transformer such as an inverter transformer configured by being wound around a primary side region and a secondary side region is known. The bobbin is provided with a flange portion perpendicular to the axial direction of the bobbin extending from the outer periphery of the bobbin, and the outer periphery of the bobbin in the axial direction of the bobbin is separated from the primary region and the secondary region by the flange portion. It is divided into.

  In the high-voltage transformer having such a configuration, a high voltage of, for example, about 2000 V is generated in the secondary winding. When forming the secondary side winding, after winding the secondary winding from one end of the secondary side region to the other end in the axial direction of the substantially cylindrical bobbin, one end from the other end of the secondary side region The secondary winding is wound in the secondary side region of the bobbin by repeating the process of winding the secondary winding over the distance and thus reciprocally winding between the one end and the other end. In the case of winding, the secondary winding portion at the start of the forward winding and the secondary winding portion at the end of the return winding are arranged close to each other. The potential difference between the two becomes large, causing a problem of dielectric breakdown. Therefore, in such a high-voltage transformer, the secondary winding is wound around the secondary region of the bobbin by a winding method such as so-called section winding or bank winding.

  In section winding, a partition plate that partitions the secondary side region of the bobbin into a plurality of regions is provided on the outer periphery of the bobbin, and the secondary winding is wound around each region of the secondary side region partitioned by the partition plate. The By reducing the reciprocating distance of the windings, the potential difference is reduced to eliminate the problem of dielectric breakdown.

  However, in section winding, it is necessary to reduce the winding speed when winding is completed for one region and winding is started for a region adjacent to the one region. Long time to do. In addition, when winding is performed on one region, a part of the secondary winding protrudes from the region adjacent to the one region, and is wound around the region adjacent to the one region. Sometimes, the protruding part is wound together, causing a problem of insulation failure.

  In the bank winding, for example, the primary side region 2 and the secondary winding 2 are first cut in such a manner that a secondary winding is first cut in a cross section including a substantially cylindrical bobbin axial center into a substantially right triangle on the outer periphery of the bobbin. It winds so that the two sides which make the right angle of the said substantially right triangle each may contact | abut to the collar part partitioned off into a secondary side area | region, and the outer periphery of the bobbin which prescribes | regulates a secondary side area | region. Next, after winding the secondary winding along the upper end from the lower end of the oblique side of the substantially right triangle, the secondary winding is wound from the upper end to the lower end of the oblique side of the substantially right triangle. By repeating the reciprocating winding process, the secondary winding is wound in each of the forward and return paths in a state where the bank angle that is the inclination angle of the hypotenuse of the right triangle is maintained in the secondary side region of the bobbin. To do. A high-voltage transformer having such a bank-wound secondary winding is described in, for example, Japanese Patent Application Laid-Open No. 2006-332341 (Patent Publication 1).

In an inverter transformer, leakage inductance is used to suppress fluctuations in current value due to fluctuations in voltage. In order to obtain the leakage inductance, it is only necessary to lower the coupling between the primary winding and the secondary winding. For this purpose, the turn ratio of the secondary winding to the primary winding is reduced. Alternatively, it is conceivable to separate the primary winding and the secondary winding. However, since it is not possible to change the turns ratio, the leakage inductance can be obtained by separating the primary side winding and the secondary side winding, and the leakage inductance can be adjusted by further adjusting the separation distance. Is realistic.
JP 2006-332341 A

  In order to adjust the leakage inductance in this way, the distance between the primary winding and the secondary winding is adjusted by adjusting the thickness of the flange in the axial direction of the substantially cylindrical bobbin. However, in this case, each time the leakage inductance is adjusted, the bobbin must be redesigned to have a different shape.

  Further, in the case of the bank winding described above, the primary side region and 2 are arranged so that the cross section obtained by cutting the secondary winding in advance along the cross section including the axis of the substantially cylindrical bobbin becomes a substantially right triangle. When the thickness of the collar portion is not changed, the winding is performed so that two sides forming a right angle of the substantially right triangle come into contact with the collar portion partitioned from the secondary region and the outer periphery of the bobbin. The separation distance between the side winding and the secondary winding is always equal to the thickness of the flange, and it is difficult to adjust the separation distance between the primary winding and the secondary winding.

  Therefore, an object of the present invention is to provide a high-voltage transformer that can easily adjust the separation distance between the primary side winding and the secondary side winding without changing the bobbin.

In order to solve the above-mentioned problems, the present invention provides a core, a substantially straight cylindrical portion provided so as to wrap around the core, and an outer periphery of the cylindrical portion so as to be perpendicular to the axial direction of the cylindrical portion. A bobbin provided with a flange that extends in the direction of the cylinder and divides the outer periphery of the cylindrical part into a primary bobbin area and a secondary bobbin area in the axial direction of the cylindrical part, A primary winding wound around the primary bobbin region of the bobbin, and a secondary winding made of a conductive wire and wound around the secondary bobbin region of the bobbin, The winding is layered on the outer periphery of the cylindrical portion so that the winding has an opposite side bank angle that approaches the outer periphery of the cylindrical portion as it moves away from the flange in the axial direction of the cylindrical portion. The portion of the secondary winding that is wound by the bank winding in the circumferential direction of the cylinder and faces the flange in the axial direction of the cylindrical portion is A flange-side bank portion having a flange-side bank angle such as to be separated from the outer periphery of the tubular-shaped portion as spaced from the collar portion in the axial direction of the cylindrical shape portion, and the collar portion on the outer periphery of the cylindrical-shaped portion An alignment winding portion spirally wound in the circumferential direction of the cylindrical portion from the flange portion to the flange bank portion in the axial direction of the cylindrical portion between the flange portion and the flange side bank portion; has, the collar side bank angle of the collar side bank portions state, and are less than 20 ° greater than 0 ° a direction away from the collar portion to a axial direction of the cylindrical shape portion as a reference, the When the number of layers of the aligned winding portion is counted in a direction perpendicular to the axial direction of the cylindrical portion, the aligned winding portion forms a single layer or is perpendicular to the axial direction of the cylindrical portion. A high-voltage transformer having a plurality of layers having a number of layers within 20% of the maximum number of layers when the number of layers of the secondary winding is counted is provided.

  The portion of the secondary winding that faces the flange in the axial direction of the cylindrical portion has a vertical bank angle that is separated from the outer periphery of the cylindrical portion as it is separated from the flange in the axial direction of the cylindrical portion. The heel side bank portion has a heel side bank portion, and the heel side bank angle of the heel side bank portion is greater than 0 ° and not more than 20 ° with respect to the axial direction of the cylindrical portion and the direction away from the heel portion. The distance between the primary side winding and the secondary side winding can be easily adjusted by adjusting the heel side bank angle within the range of more than 20 ° and less than 20 °. Even if it is used, the leakage inductance can be easily adjusted.

  The secondary winding has a circumferential direction of the cylindrical portion toward the axial direction of the cylindrical portion from the flange portion to the flange side bank portion between the flange portion on the outer periphery of the cylindrical portion and the flange side bank portion. When the number of layers of the aligned winding portion is counted in a direction perpendicular to the axial direction of the cylindrical portion, the aligned winding portion forms a single layer, or Since the number of layers of the secondary winding is counted in the direction perpendicular to the axial direction of the cylindrical portion, the aligned winding portion has a leakage layer in order to form a plurality of layers having a number of layers within 20% of the maximum value of the number of layers. It is possible to prevent the inductance from being affected. For this reason, the bank side bank part of the secondary winding can be separated from the flange part by a larger distance by the amount of the aligned winding part, and the leakage inductance can be further increased.

  In addition, the present invention provides a core, a substantially straight cylindrical shape portion provided with at least a first surface and a second surface facing each other, and provided around the core, and the cylinder from the outer periphery of the cylindrical shape portion. A flange that extends in a direction perpendicular to the axial direction of the shape portion and that divides the outer periphery of the tube shape portion into a primary bobbin region and a secondary bobbin region in the axial direction of the tube shape portion; A bobbin, a primary winding wound around the primary bobbin region of the bobbin made of a conductive wire, and a secondary winding wound around the secondary bobbin region of the bobbin made of a conductive wire The secondary side winding includes a first turn portion wound around the cylindrical shape portion at an equal pitch from one end side in the axial direction to the other end side of the cylindrical shape portion; As an outer peripheral side turn portion on the first surface of the turn portion, the pitch is equal to the first turn portion from the other end in the axial direction toward the one end. The second turn part wound several times, and the outer peripheral side turn part on the first surface of the second turn part, and the same pitch from the first turn part toward the other end side in the axial direction And a third turn portion wound a plurality of times on the side surface connecting the first surface and the second surface. The secondary windings are offset from each other in the axial direction, the intersection of one turn part and the other turn part is located on the first surface, and the secondary winding at one pitch of the first turn part The spacing between the side windings is configured to be equal to or greater than the product of the diameter of the secondary winding and the number obtained by subtracting one from the number of multiple turns, and faces the flange in the axial direction of the cylindrical portion. The portion of the secondary winding to be separated from the outer periphery of the tubular portion as it is separated from the flange portion in the axial direction of the tubular portion. The heel side bank portion has a heel side bank angle, and the heel side bank angle of the heel side bank portion is 0 ° with respect to the axial direction of the cylindrical portion and the direction away from the heel portion. A high-voltage transformer that is larger than 20 ° is provided.

  The portion of the secondary winding that faces the flange in the axial direction of the cylindrical portion has a vertical bank angle that is separated from the outer periphery of the cylindrical portion as it is separated from the flange in the axial direction of the cylindrical portion. The heel side bank portion has a heel side bank portion, and the heel side bank angle of the heel side bank portion is greater than 0 ° and not more than 20 ° with respect to the axial direction of the cylindrical portion and the direction away from the heel portion. By adjusting the side bank angle, the separation distance between the primary side winding and the secondary side winding can be easily adjusted. Even when the secondary side winding is wound by bank winding, The leakage inductance can be easily adjusted.

  The secondary side winding includes a first turn portion wound around the cylindrical portion at a plurality of equal pitches from one end side in the axial direction to the other end side of the cylindrical portion, and a first turn portion of the first turn portion. A second turn part wound around the first turn part at an equal pitch from the other end side in the axial direction toward the one end side as an outer periphery side turn part on the surface, and an outer periphery on the first surface of the second turn part As a side turn part, it is wound around a plurality of turn parts having at least three turn parts of a third turn part wound at a constant pitch with the first turn part from one end side in the axial direction toward the other end side. On the side surface connecting the first surface and the second surface, the secondary windings of the plurality of turn portions are arranged so as to be offset from each other in the axial direction, and the intersection between one turn portion and the other turn portion is the first. The spacing between the secondary windings in one pitch of the first turn part is on the surface, and the distance between the secondary winding diameter and the number of turns Because it is configured to be greater than or equal to the product of the number of parts minus one, the place where the first turn part and the second turn part intersect, the second turn part and the third turn part intersect You don't have to overlap each other. For this reason, it can prevent that the location which the conducting wire which comprises a secondary side winding cross | intersects rises notably, and can suppress generation | occurrence | production of winding collapse.

  As described above, according to the present invention, it is possible to provide a high-voltage transformer that can easily adjust the separation distance between the primary winding and the secondary winding without changing the bobbin.

  A high-voltage transformer according to an embodiment of the present invention will be described with reference to FIGS. More specifically, the high-voltage transformer is an inverter transformer 1 as shown in FIG. The inverter transformer 1 has a size of about 40 × 10 × 5 mm, and includes a resin bobbin 2, a primary side winding 3 and a secondary side winding 4 wound around the surface of the resin bobbin 2, and an I type A core 5, a U-shaped core 6, a first fixing bracket 7, and a second fixing bracket 8 are provided.

  The resin bobbin 2 that is a winding core portion has a cylindrical portion 2B (FIG. 3) that forms a hollow cylindrical shape so that the I-type core 5 can be held therein. On the outer peripheral surface, which is the surface of the cylindrical portion 2B, of the resin bobbin 2, the primary winding 3 is wound around the outer periphery of the cylindrical portion 2B in the axial direction of the cylindrical portion 2B as will be described later. Ribs 2A are formed to divide into a bobbin region 24 and a secondary bobbin region 25 around which the secondary winding 4 is wound. The rib 2A is provided so as to extend from the outer periphery of the tubular portion 2B in a direction perpendicular to the axial direction of the tubular portion 2B. The rib 2A corresponds to a collar portion.

  The cross section orthogonal to the below-mentioned x axis of the resin bobbin 2 in the primary side bobbin area | region 24 and the secondary side bobbin area | region 25 is comprised by the substantially square shape. Further, as shown in FIG. 3, the secondary-side bobbin region 25 is opposed to the upper surface, the upper surface 25A that is one surface forming a quadrangle, the first side surface 25B and the second side surface 25C that are both side surfaces connected to the upper surface 25A. The cross section orthogonal to the x-axis is formed in a rectangle with the upper surface 25A and the lower surface (not shown) as long sides.

  As shown in FIG. 1, a cover 21 that covers the wound secondary winding 4 is provided on the secondary bobbin region 25. In the resin bobbin 2, the direction parallel to the axial direction of the cylindrical portion 2B and from the position where the primary winding 3 is wound to the position where the secondary winding 4 is wound is defined as the x-axis direction. In addition, the direction orthogonal to the x-axis direction is defined as the y-axis direction and the z-axis direction, respectively, and the arrow direction of the xyz axis is defined as the + direction. Further, in the resin bobbin 2, as shown in FIG. 2, there is a built-in portion near one end on the side where the primary winding 3 is wound and near the other end on the side where the secondary winding 4 is wound. Openings 2a and 2b are formed in which only the side surfaces orthogonal to the y-axis direction and a part of the lower surface in the z-axis direction are exposed.

  The primary winding 3 and the secondary winding 4 are connected to the negative end and the positive end in the x-axis direction of the resin bobbin 2, and the inverter transformer 1 is mounted on a substrate (not shown). The primary electrode portion 22-1 and the secondary electrode portion 22-2, which are the mounting portions when being formed, and the primary side winding 3 and the secondary side winding 4 are not connected to each other and are connected to a substrate (not shown). A dummy electrode 23 serving as a mounting portion when the transformer 1 is mounted is disposed. In FIG. 3, the primary electrode part 22-1, the secondary electrode part 22-2, and the dummy electrode 23 are shown extending to the z-axis minus side in FIG. 3, but when mounted on the substrate. Is bent so as to be oriented in a direction parallel to the x-axis direction as shown in FIGS. 1 and 2 so that the inverter transformer 1 can be mounted on a substrate (not shown). In the resin bobbin 2, a first groove 2c and a second groove 2d are formed in the vicinity of the opening 2a and in the vicinity of the opening 2b. The first groove 2c and the second groove 2d are engaged with each other. The first groove 2 c and the second groove 2 d are formed in substantially the same shape as a mirror surface, and are formed in the y-axis direction so as to open on the side surface of the resin bobbin 2.

  The primary side winding 3 and the secondary side winding 4 are composed of conducting wires having different diameters from each other, and are partitioned by ribs 2A on the outer periphery of the resin bobbin 2, so that one end side in the axial direction of the cylindrical portion 2B It is wound around the other end side and connected to the primary electrode part 22-1 and the secondary electrode part 22-2, respectively.

  The I-type core 5 is formed in a substantially rectangular parallelepiped having a longitudinal direction in the x-axis direction by a magnetically permeable material such as ferrite and disposed in the resin bobbin 2. Accordingly, the I-type core 5 is wrapped around the cylindrical portion 2B of the resin bobbin 2. As shown in FIG. 2, the side surface of the I-type core 5 and the position near the one end side end and the position near the other end side end are exposed from the opening 2a and the opening 2b, respectively.

  The U-shaped core 6 is made of the same material as that of the I-shaped core 5, and as shown in FIG. 2, is substantially composed of a base 61 and a first arm 62 and a second arm 63 that extend from both ends of the base 61. It is configured in a U shape. The distal end in the extending direction of the first arm portion 62 and the distal end in the extending direction of the second arm portion 63 are in contact with the side surfaces of the I-shaped core 5 exposed from the openings 2a and 2b, respectively, and the upper surface of the resin bobbin 2 Each of them is in contact with a wall constituting 25A. As shown in FIG. 2, a first locked portion 62 </ b> A that protrudes to the positive side in the y-axis direction is provided on the side surface of the first arm portion 62, and the side surface of the second arm portion 63 has y A second locked portion 63A that protrudes in the direction toward the positive side in the axial direction is provided.

  The first fixing bracket 7 and the second fixing bracket 8 are configured to be symmetrical to each other by bending a plate-like metal plate, and are inserted into the first groove 2c and the second groove 2d, respectively. The first locked portion 62A and the second locked portion 63A are fixed to the resin bobbin 2 and engaged with the first locked portion 62A and the second locked portion 63A. It is energizing towards. Therefore, the first arm portion 62 and the second arm portion 63 of the U-shaped core 6 are in close contact with the I-shaped core 5, and a closed magnetic circuit is formed by the I-shaped core 5 and the U-shaped core 6.

  The primary winding 3 is made of AIW (polyamideimide copper wire), which is an insulation-coated conductor having a diameter of 200 μm, and is wound around the primary bobbin region 24 by so-called aligned winding. That is, the primary side winding 3 is wound from one end of the primary side region to the other end in the axial direction of the cylindrical portion 2B and then wound from the other end of the primary side region to the one end. Thus, by repeating the step of reciprocating and winding between one end and the other end of the primary side region, the primary side region is wound 25 times in the circumferential direction of the cylindrical portion 2B.

  The secondary winding 4 is made of AIW (polyamideimide copper wire), which is an insulation-coated conductor having a diameter of 30 μm, and is wound around the secondary bobbin region 25 by so-called bank winding. As shown in FIG. 4, the bank winding in the present embodiment forms a layer on the outer periphery of the cylindrical portion 2B so as to be layered in a direction perpendicular to the x-axis direction that is the axial direction of the cylindrical portion 2B. This is done by winding the secondary winding 4 in the circumferential direction 2B. In the following description of the bank winding, only the main part of the resin bobbin 2 including the upper surface 25A will be described based on the cross-sectional view of the main part including the upper surface 25A. The two side surfaces 25C and the lower surface (not shown) are wound in the same manner as the relevant part of the resin bobbin 2 including the upper surface 25A. In the cross-sectional view of FIG. 4, hatching is omitted for the cross sections of secondary windings 4-1, 4-2,.

  More specifically, when the resin bobbin 2 is mounted on a spindle (not shown) and rotated about a rotation axis extending in the x-axis direction, the secondary winding 4 is first shown in FIG. The secondary secondary winding 4-1, which is numbered “1” of the secondary winding 4 shown in FIG. 4, is wound so as to contact the rib 2 A and the cylindrical portion 2 B. (Hereinafter referred to as “secondary windings 4-1, 4-2,..., 4- 40 ”) toward the plus side in the x-axis direction, the secondary winding 4-2 is the right side portion and the cylindrical portion shown in FIG. 4 of the secondary winding 4-1. The secondary winding 4-3 is wound so as to be in contact with the upper surface 25A of the 2B, and the secondary side winding 4-2 of the secondary side winding 4-2 shown in FIG. 4 and the upper surface 2 of the cylindrical portion 2B. The secondary winding 4-4 is wound so as to be in contact with A, and the secondary winding 4-3 is in contact with the right lateral portion shown in FIG. 4 of the secondary winding 4-3 and the upper surface 25A of the cylindrical portion 2B. Is wound. Next, it slightly returns to the negative side in the x-axis direction, and the secondary winding 4-5 hits the upper part of the secondary winding 4-3 shown in FIG. 4 and the upper part of the secondary winding 4-4. It is wound so that it touches. Thus, by the secondary side winding 4-4 and the secondary side winding 4-5, the ruminant side which approaches the upper surface 25A of the cylindrical part 2B as it separates from the rib 2A in the axial direction of the cylindrical part 2B. A bank angle is formed.

  Next, toward the positive side in the x-axis direction, the secondary winding 4-6 contacts the right lateral portion of the secondary winding 4-4 shown in FIG. 4 and the upper surface 25A of the cylindrical portion 2B. So that it is wound. Next, it slightly returns to the negative side in the x-axis direction, and the secondary winding 4-7 is the upper part of the secondary winding 4-4, the upper part of the secondary winding 4-6, and the secondary winding. It is wound so as to abut on the right side of 4-5. Thus, by the secondary side winding 4-6 and the secondary side winding 4-7, the ruminant side which approaches the upper surface 25A of the cylindrical part 2B as it separates from the rib 2A in the axial direction of the cylindrical part 2B. A bank angle is formed.

  Next, toward the positive side in the x-axis direction, the secondary winding 4-8 abuts against the right lateral portion of the secondary winding 4-6 shown in FIG. 4 and the upper surface 25A of the cylindrical portion 2B. So that it is wound. Next, it slightly returns to the negative side in the x-axis direction, and the secondary side winding 4-9 is the upper side of the secondary side winding 4-6, the upper side of the secondary side winding 4-8, and the secondary side winding. It is wound so as to contact the right side portion of 4-7. Thus, by the secondary side winding 4-8 and the secondary side winding 4-9, the ruminant side which approaches the upper surface 25A of the cylindrical part 2B as it separates from the rib 2A in the axial direction of the cylindrical part 2B. A bank angle is formed.

  Next, toward the positive side in the x-axis direction, the secondary winding 4-10 contacts the right lateral portion of the secondary winding 4-8 shown in FIG. 4 and the upper surface 25A of the cylindrical portion 2B. So that it is wound. Next, it returns slightly to the minus side in the x-axis direction, and the secondary winding 4-11 is the upper part of the secondary winding 4-8, the upper part of the secondary winding 4-10, and the secondary winding. It is wound so as to contact the right side portion of 4-9. Next, return further to the minus side in the x-axis direction so that the secondary winding 4-12 contacts the upper part of the secondary winding 4-9 and the upper part of the secondary winding 4-11. It is wound. In this way, as the secondary winding 4-10, the secondary winding 4-11, and the secondary winding 4-12 move away from the rib 2A in the axial direction of the cylindrical portion 2B, the cylindrical portion An opposite bank angle is formed which approaches the upper surface 25A of 2B.

  Next, toward the positive side in the x-axis direction, the secondary winding 4-13 abuts against the right lateral portion of the secondary winding 4-10 shown in FIG. 4 and the upper surface 25A of the cylindrical portion 2B. So that it is wound. Next, it slightly returns to the negative side in the x-axis direction, and the secondary winding 4-14 is the upper part of the secondary winding 4-10, the upper part of the secondary winding 4-13, and the secondary winding. It is wound so as to abut on the right side portion of 4-11. Next, the secondary winding 4-15 returns slightly to the negative side in the x-axis direction, and the secondary winding 4-15 is located above the secondary winding 4-11, above the secondary winding 4-14, and secondary winding. It winds so that it may contact | abut to the right side part of the wire | line 4-12. In this way, as the secondary winding 4-13, the secondary winding 4-14, and the secondary winding 4-15 move away from the rib 2A in the axial direction of the cylindrical portion 2B, the cylindrical portion is increased. An opposite bank angle is formed which approaches the upper surface 25A of 2B.

  Next, toward the positive side in the x-axis direction, the secondary winding 4-16 abuts on the right side portion shown in FIG. 4 of the secondary winding 4-13 and the upper surface 25A of the cylindrical portion 2B. So that it is wound. Next, it returns slightly to the minus side in the x-axis direction, and the secondary winding 4-17 is the upper part of the secondary winding 4-13, the upper part of the secondary winding 4-16, and the secondary winding. It is wound so as to abut on the right side portion of 4-14. Next, the secondary winding 4-18 returns slightly to the minus side in the x-axis direction so that the secondary winding 4-18 is above the secondary winding 4-14, above the secondary winding 4-17, and secondary winding. The wire 4-15 is wound so as to contact the right lateral portion of the wire 4-15. In this way, the cylindrical portion as the distance from the rib 2A increases in the axial direction of the cylindrical portion 2B by the secondary winding 4-16, the secondary winding 4-17, and the secondary winding 4-18. An opposite bank angle is formed which approaches the upper surface 25A of 2B.

  Next, toward the positive side in the x-axis direction, the secondary winding 4-19 abuts against the right lateral portion of the secondary winding 4-16 shown in FIG. 4 and the upper surface 25A of the cylindrical portion 2B. So that it is wound. Next, it slightly returns to the minus side in the x-axis direction, and the secondary winding 4-20 is above the secondary winding 4-16, above the secondary winding 4-19, and secondary winding. It is wound so as to abut on the right lateral portion of 4-17. Next, the x-axis direction returns slightly further to the minus side, and the secondary side winding 4-21 is located above the secondary side winding 4-17, above the secondary side winding 4-20, and secondary side winding. The wire 4-18 is wound so as to contact the right lateral portion of the wire 4-18. Next, return further to the minus side in the x-axis direction so that the secondary winding 4-22 contacts the upper part of the secondary winding 4-18 and the upper part of the secondary winding 4-21. It is wound. In this way, the secondary side winding 4-19, the secondary side winding 4-20, the secondary side winding 4-21, and the secondary side winding 4-22 move in the axial direction of the cylindrical portion 2B. As the distance from the rib 2A increases, an opposite bank angle is formed that approaches the upper surface 25A of the cylindrical portion 2B.

  Next, toward the positive side in the x-axis direction, the secondary winding 4-23 abuts against the right lateral portion of the secondary winding 4-19 shown in FIG. 4 and the upper surface 25A of the cylindrical portion 2B. So that it is wound. Next, it slightly returns to the negative side in the x-axis direction, and the secondary winding 4-24 is located above the secondary winding 4-19, above the secondary winding 4-23, and secondary winding. It is wound so as to abut on the right side portion of 4-20. Next, the secondary winding 4-25 returns slightly to the minus side in the x-axis direction so that the secondary winding 4-25 is above the secondary winding 4-20, above the secondary winding 4-24, and secondary winding. The wire 4-21 is wound so as to contact the right lateral portion of the wire 4-21. Next, the x-axis direction is further returned slightly to the minus side, and the secondary winding 4-26 is placed above the secondary winding 4-21, above the secondary winding 4-25, and secondary winding. It winds so that it may contact | abut to the right side part of the wire | line 4-22. In this way, the secondary side winding 4-23, the secondary side winding 4-24, the secondary side winding 4-25, and the secondary side winding 4-26 move in the axial direction of the cylindrical portion 2B. As the distance from the rib 2A increases, an opposite bank angle is formed that approaches the upper surface 25A of the cylindrical portion 2B.

  Next, toward the positive side in the x-axis direction, the secondary winding 4-27 abuts against the right lateral portion of the secondary winding 4-23 shown in FIG. 4 and the upper surface 25A of the cylindrical portion 2B. So that it is wound. Next, it slightly returns to the minus side in the x-axis direction, and the secondary winding 4-28 is located above the secondary winding 4-23, above the secondary winding 4-27, and secondary winding. It is wound so as to abut on the right side portion of 4-24. Next, the x-axis direction further returns slightly to the minus side, and the secondary winding 4-29 is positioned above the secondary winding 4-24, above the secondary winding 4-28, and secondary winding. The wire 4-25 is wound so as to contact the right lateral portion of the wire 4-25. Next, the secondary winding 4-30 returns slightly to the minus side in the x-axis direction so that the secondary winding 4-30 is above the secondary winding 4-25, above the secondary winding 4-29, and secondary winding. It is wound so as to contact the right lateral part of the wire 4-26. In this way, the secondary side winding 4-27, the secondary side winding 4-28, the secondary side winding 4-29, and the secondary side winding 4-30 move in the axial direction of the cylindrical portion 2B. As the distance from the rib 2A increases, an opposite bank angle is formed that approaches the upper surface 25A of the cylindrical portion 2B.

  Next, toward the positive side in the x-axis direction, the secondary winding 4-31 comes into contact with the right lateral portion of the secondary winding 4-27 shown in FIG. 4 and the upper surface 25A of the cylindrical portion 2B. So that it is wound. Next, it slightly returns to the negative side in the x-axis direction, and the secondary winding 4-32 is located above the secondary winding 4-27, above the secondary winding 4-31, and secondary winding. It is wound so as to abut on the right side of 4-28. Next, the secondary winding 4-33 returns to the minus side in the x-axis direction a little more, the upper part of the secondary winding 4-28, the upper part of the secondary winding 4-32, and the secondary winding. It is wound so as to contact the right lateral portion of the wire 4-29. Next, the x-axis direction is further returned slightly to the minus side, and the secondary side winding 4-34 is located above the secondary side winding 4-29, above the secondary side winding 4-33, and to the secondary side winding. The wire 4-30 is wound so as to contact the right lateral portion of the wire 4-30. Next, return further to the minus side in the x-axis direction so that the secondary winding 4-35 contacts the upper part of the secondary winding 4-30 and the upper part of the secondary winding 4-34. It is wound. In this way, the secondary winding 4-31, the secondary winding 4-32, the secondary winding 4-33, the secondary winding 4-34, and the secondary winding 4-35 are used. As the distance from the rib 2A increases in the axial direction of the tubular portion 2B, a repetitive bank angle that approaches the upper surface 25A of the tubular portion 2B is formed.

  Next, toward the plus side in the x-axis direction, the secondary winding 4-36 contacts the right lateral portion of the secondary winding 4-31 shown in FIG. 4 and the upper surface 25A of the cylindrical portion 2B. So that it is wound. Next, it slightly returns to the negative side in the x-axis direction, and the secondary winding 4-37 is located above the secondary winding 4-31, above the secondary winding 4-36, and secondary winding. It is wound so as to abut on the right side of 4-32. Next, the x-axis direction further returns slightly to the minus side, and the secondary winding 4-38 is located above the secondary winding 4-32, above the secondary winding 4-37, and secondary winding. It winds so that it may contact | abut to the right side part of the wire | line 4-33. Next, the secondary winding 4-39 returns slightly to the minus side in the x-axis direction so that the secondary winding 4-39 is above the secondary winding 4-33, above the secondary winding 4-38, and secondary winding. It winds so that it may contact | abut to the right side part of the wire | line 4-34. Next, the x-axis direction is further returned slightly to the minus side, and the secondary winding 4-40 is placed above the secondary winding 4-34, above the secondary winding 4-39, and secondary winding. It winds so that it may contact | abut to the right side part of the wire | line 4-35. In this way, the secondary winding 4-36, the secondary winding 4-37, the secondary winding 4-38, the secondary winding 4-39, and the secondary winding 4-40 are used. As the distance from the rib 2A increases in the axial direction of the tubular portion 2B, a repetitive bank angle that approaches the upper surface 25A of the tubular portion 2B is formed.

  As described above, the secondary side winding 4-36, the secondary side winding 4-37, the secondary side winding 4-38, the secondary side winding 4-39, and the secondary side winding 4-40 are used. The secondary side winding 4 is further wound thereafter in the same manner as the opposite bank angle is formed which approaches the upper surface 25A of the cylindrical portion 2B as it is separated from the rib 2A in the axial direction of the cylindrical portion 2B. As shown in FIG. 4, the secondary winding 4 is formed on the upper surface 25A of the cylindrical portion 2B and perpendicular to the axial direction of the cylindrical portion 2B. As a result, it is wound in the circumferential direction of the cylindrical portion 2B so as to form a maximum of 10 layers. The total number of windings is 2500 from the secondary winding 4-1. FIG. 4 shows only a portion of the secondary winding 4 having a five-layer structure for convenience of explanation.

  The portion of the secondary winding 4 wound by the bank winding as described above, and the portion of the secondary winding 4 facing the rib 2A in the axial direction of the cylindrical portion 2B is shown in FIG. As shown in the figure, it has a heel side bank portion 4A having a heel side bank angle 4b that is separated from the upper surface 25A of the tubular portion 2B as it is separated from the rib 2A in the axial direction of the tubular portion 2B. More specifically, the upper peripheral surface of the secondary winding 4-1, the upper peripheral surface of the secondary winding 4-5, the upper peripheral surface of the secondary winding 4-12, and the secondary winding. An imaginary tangent line 4a connecting the upper circumferential surface of 4-22 and the upper circumferential surface of the secondary winding 4-35 forms the heel side bank angle 4b, and the heel side bank angle 4b is in the axial direction of the cylindrical portion 2B. In the direction from the bottom to the top of the bank, that is, the direction from the secondary winding 4-1 to the secondary winding 4-35 with reference to the x-axis plus direction, which is the direction away from the rib 2A, 20 Make an angle of °.

  The portion of the secondary winding 4 that faces the rib 2A in the axial direction of the tubular portion 2B should be separated from the upper surface 25A of the tubular portion 2B as it is separated from the rib 2A in the axial direction of the tubular portion 2B. The side bank angle 4b of the side bank part 4A has a side bank angle 4b. The side bank angle 4b of the side bank part 4A is secondary with respect to the axial direction of the cylindrical part 2B and the direction away from the rib 2A. Since the angle of 20 ° is formed in the direction from the side winding 4-1 to the secondary winding 4-35, the leakage inductance can be set to a desired value.

  Next, an experiment was performed to measure the change rate of leakage inductance by adjusting the bank side bank angle 4b in the inverter transformer 1 which is a high voltage transformer according to the embodiment of the present invention. In the experiment, only the bank side bank angle 4b was set to a value different from the bank side bank angle 4b of the high-voltage transformer according to the above-described embodiment. More specifically, the change rate at 90 ° is defined as 0.00%, and the bank side bank angle 4b is set to 7.5 °, 10 °, 12.5 °, 15 °, 17.5 °, 20 The change rate of the leakage inductance when the angle was changed to 22.5 ° was measured. Other values, that is, the diameter and the number of turns of the primary side winding 3, the diameter and the number of turns of the secondary side winding 4, and the like are the same as those of the high voltage transformer according to the above-described embodiment. The experimental results are as shown in FIG.

  As shown in FIG. 5, the change rate of the leakage inductance hardly changes when the bank side bank angle 4b is between 90 ° and 20 °, and is 0.21% at 20 °. On the other hand, when the bank side bank angle 4b is 20 ° or less, the rate of change in leakage inductance increases rapidly. When the bank side bank angle 4b is 22.5 °, it is 0.08%, when the bank side bank angle 4b is 20 °, it is 0.21%, and when the bank side bank angle 4b is 17.5 °, it is 0.58%. Yes, 0.96% when the bank side bank angle 4b is 15 °, 5.53% when the bank side bank angle 4b is 12.5 °, and 10.20% when the bank side bank angle 4b is 10 °. Yes, it is 19.20% when the bank side bank angle 4b is 7.5 °. As described above, when the bank side bank angle 4b is 20 ° or less, the leakage inductance changes greatly by adjusting the bank side bank angle 4b. Therefore, the bank side bank angle 4b is adjusted within the range of more than 0 and 20 ° or less. As a result, the separation distance between the primary winding 3 and the secondary winding 4 can be easily adjusted. As a result, the secondary winding 4 is wound by bank winding. However, it can be seen that the leakage inductance can be easily adjusted.

  The present invention is not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, the secondary winding 104 extends in the axial direction of the tubular portion 2B from the rib 2A to the heel side bank portion 104A between the rib 2A on the upper surface 25A of the tubular portion 2B and the heel side bank portion 104A. You may make it have the alignment winding part 104B wound helically in the circumferential direction of the cylindrical part 2B toward it.

  More specifically, as shown in FIG. 6, the secondary winding 104 is first brought into contact with the rib 2 </ b> A and the cylindrical portion 2 </ b> B, so that “1” of the secondary winding 104 shown in FIG. 6. The secondary winding 104-1 which is numbered "1" is started to be wound (hereinafter, the secondary winding 104 numbered in FIG. 6 is similar to the present embodiment). (Secondary windings 104-1, 104-2,..., 104-39) are displayed in the order in which the portions are wound, and the secondary is directed toward the plus side in the x-axis direction. The side winding 104-2 is wound so as to be in contact with the right side portion shown in FIG. 6 of the secondary side winding 104-1 and the upper surface 25A of the cylindrical portion 2B, and the secondary side winding 104-3. Is wound so as to be in contact with the right lateral portion of the secondary winding 104-2 shown in FIG. 4 and the upper surface 25A of the cylindrical portion 2B. Yuku is wound so as to line 104-4 abuts the upper surface 25A of the right side portion and a cylindrical portion 2B shown in Figure 4 of the secondary winding 104-3. As described above, the aligned winding portion 104B including the secondary winding 104-1, the secondary winding 104-2, the secondary winding 104-3, and the secondary winding 104-4 is formed. Is done. Therefore, the aligned winding portion 104B forms a single layer when the number of layers of the aligned winding portion 104B is counted in a direction perpendicular to the axial direction of the cylindrical portion 2B as shown in FIG. In the cross-sectional view of FIG. 6, hatching is omitted for the cross sections of the secondary windings 104-1, 104-2,.

  Next, the secondary windings 104-5, 104-6, 104- are formed by bank winding in the same manner as the secondary windings 4-1, 4-2, 4-3,. 7, ... are wound. As described above, the secondary winding 104 is disposed between the rib 2A on the upper surface 25A of the cylindrical portion 2B and the heel side bank portion 104A and extends from the rib 2A to the heel side bank portion 104A. The aligned winding portion 104B is spirally wound in the circumferential direction of the cylindrical portion 2B toward the direction, and the aligned winding portion 104B is a layer of the aligned winding portion 104B in a direction perpendicular to the axial direction of the cylindrical portion 2B. Therefore, the aligned winding portion 104B can be prevented from affecting the adjustment of the leakage inductance. For this reason, the side bank portion 104A of the secondary winding 104 can be separated from the rib 2A by a larger distance by the amount of the aligned winding portion 104B, and the leakage inductance can be further increased.

  Since the aligned winding portion 104B has no problem as long as it does not affect the adjustment of the leakage inductance, the number of layers of the secondary winding 104 in the direction perpendicular to the axial direction of the cylindrical portion 2B is used instead of the single layer described above. It is good also as a several layer which has a layer number within 20% of the maximum value of the number of layers at the time of counting.

  Moreover, in the said embodiment and modification, although the secondary side windings 4 and 104 were wound by the bank winding, you may wind by the following winding methods. More specifically, as shown in FIG. 7, the secondary winding 204 is formed by winding the secondary winding 204 at an equal pitch for eight turns to form a so-called cross winding to form the surface of the secondary bobbin region 25. The layer portion La (see FIG. 7) is layered over a plurality of layers. Here, the “turn” means that the secondary winding 204 is spirally wound a plurality of times between one end and the other end of the secondary bobbin region 25 in the axial direction of the cylindrical portion 2B. The state wound in the circumferential direction of 2B is said. The “pitch” refers to a distance between adjacent spirals of the secondary winding 204 wound spirally in one turn.

  Hereinafter, the winding of the secondary winding 204 that forms the first layer portion La with the secondary winding 204 will be described. First, the bobbin 2 is mounted on a spindle (not shown) and rotated about a rotation axis oriented in the x-axis direction. As shown in FIG. 8, the secondary winding 204 extending from the position on the minus side of the x-axis is provided. Winding from the upper surface 25A toward the first side surface 25B through the lower surface (not shown) from the second side surface 25C to the upper surface 25A again at an equal pitch in the x-axis plus direction to the end of the secondary bobbin region 25, The turn T1 is formed (first turn part forming step). The interval between the secondary windings 204, which is the pitch in the first turn T1, is equal to or greater than the product of the diameter of the secondary winding 204 and the number of turns minus one.

  Next, the secondary turns of the first turn T1 have the same pitch as the first turn T1 from the position of the rib 2A toward the minus direction of the x-axis so as to fill the space between the secondary windings 204 at one pitch of the first turn T1. X slightly smaller than the end of the secondary bobbin region 25 in the negative direction of the x-axis in a state where it is displaced in the axial direction of the bobbin 2 so that the diameter of the secondary winding 204 is not slightly smaller than the diameter of the secondary winding 204. Winding to a position near the axis plus forms a second turn T2 as shown in FIG.

  In the second turn T2, the secondary winding 204 is positioned on one side (the negative side in the x-axis direction) of the secondary winding 204 of the first turn T1 on the surface of the first side surface 25B and the surface of the second side surface 25C. Are arranged as follows. As a result, the upper surface 25A intersects with the secondary winding 204 of the first turn T1 at a position in the vicinity of the first side face 25B (region A in FIG. 9), and the lower surface (not shown) has a second position near the second side face 25C. Intersects with the secondary winding 204 of one turn T1. In the vicinity of the corner portion of the secondary bobbin region 25, the secondary windings 204 drawn from the corners intersect, so that the secondary winding 204 is suitably tensioned and tightened at the intersecting position. The secondary windings 204 can be crossed with each other.

  Further, the secondary winding 204 of the second turn T2 is displaced from the secondary winding 204 of the first turn T1 to a degree that does not slightly meet the diameter of the secondary winding 204. As shown in FIG. 10, the wire is wound in a state of being overlapped by ΔP on the first side surface 25B. Since the secondary winding 204 is wound in a tensioned state, even if the second turn T2 overlaps the first turn T1 as described above, the amount of overlap ΔP is slight. The secondary side winding 204 of the second turn T2 falls on the surface of the first side face 25B in a state of being attached to the secondary side winding 204 of the first turn T1. The secondary side winding 204 of the second turn T2 falls on the surface of the first side surface 25B while being attached to the secondary side winding 204 of the first turn T1, so that the first side of the first side T The secondary winding 204 and the secondary winding 204 of the second turn T2 can be suitably aligned.

  Next, from the winding end position of the second turn, the first turn T1 has the same pitch as the first turn T1 in the positive direction of the x axis so as to fill the space between the secondary windings 204 in one pitch of the first turn T1. It is slightly more than the end of the secondary bobbin region 25 in the x-axis plus direction in a state where it is shifted from the secondary side winding 204 of the second turn T2 so that the diameter of the secondary side winding 204 is not slightly filled. Winding to a position closer to the axis minus makes a third turn T3 as shown in FIG.

  The third turn T3 is also located on the secondary winding 204 of the second turn T2 so that the second turn T2 is positioned on one side (the negative side in the x-axis direction) of the secondary winding 204 of the first turn T1. It is arranged along the secondary winding 204 of the second turn T2 on one side (the negative side in the x-axis direction). As a result, the secondary winding 204 of the third turn T3 intersects the secondary winding 204 of the second turn T2 near the second side surface 25C on the upper surface 25A (in the region B in FIG. 11). , A region different from region A), the lower surface (not shown) intersects the secondary winding 204 of the second turn T2 at a position near the first side surface 25B.

  After winding the third turn T3, the fourth turn T4 is wound in the same manner as the second turn T2 (FIG. 12). The secondary winding 204 of the fourth turn T4 intersects the secondary winding 204 of the first turn T1 in the region C located on the surface of the upper surface 25A on the negative side in the y-axis direction from the region A, and the second winding 204 in the region A Crosses the secondary winding 204 of the third turn T3.

  Next, the fifth turn T5 is wound in the same manner as the third turn T3 (FIG. 13). The secondary winding 204 of the fifth turn T5 intersects the secondary winding 204 of the fourth turn T4 in the region B on the surface of the upper surface 25A, and in the region D located on the plus side in the y-axis direction from the region B. Crosses the secondary winding 204 of the second turn T2. This is further repeated in the sixth turn T6 to the eighth turn T8 to fill all the pitches of the first turn T1 (inter-conductor filling step), and the layer portion La shown in FIG. 7 is formed. When the first layer portion La is formed, the first layer portion La is further layered to similarly form the second layer portion La including the first turn T1 to the eighth turn T8.

  By repeating this a plurality of times, the secondary winding 204 is formed in the state shown in FIG. At this time, the end of the layer portion La in the axial direction of the cylindrical portion 2B gradually becomes the rib 2A in the axial direction of the cylindrical portion 2B as it goes to the second layer portion La, the third layer portion La and the upper layer. It is wound so as to be positioned on the positive side in the x-axis direction, which is the direction away from the center. Accordingly, the portion of the secondary winding 204 that faces the rib 2A in the axial direction of the tubular portion 2B is separated from the outer periphery of the tubular portion 2B as it is separated from the rib 2A in the axial direction of the tubular portion 2B. It becomes the structure which has the side bank part which has such a side bank angle. The heel side bank angle of the heel side bank portion takes a value that is greater than 0 ° and less than or equal to 20 ° on the basis of the axial direction of the cylindrical portion 2B and the direction away from the rib 2A, as in the present embodiment. .

  Since the secondary winding 204 is wound by the winding method as described above, the portion where the first turn and the second turn intersect and the portion where the second turn and the third turn intersect are overlapped. You do n’t have to. For this reason, it can prevent that the location where the conducting wire which comprises the secondary side winding 204 cross | intersects rises notably, and can suppress generation | occurrence | production of winding collapse.

  The high-voltage transformer according to the present embodiment is the inverter transformer 1, but is not limited to the inverter transformer, and can be applied to a high-voltage transformer using leakage inductance.

  The number of turns of the secondary winding 4 is 2500, but is not limited to this value, and may be 1000 to 4000. The secondary winding 204 has a diameter of 30 μm, but is not limited to this value, and may be 20 μm to 40 μm.

  The high-voltage transformer of the present invention is useful in the field of transformers and the like in which a high voltage is applied to a secondary winding such as an inverter transformer.

The perspective view which shows the high voltage | pressure transformer concerning embodiment of this invention. The bottom view which shows the high voltage transformer concerning embodiment of this invention. The perspective view which shows the part remove | excluding the cover, the primary side coil | winding, and the secondary side coil | winding from the high voltage transformer concerning embodiment of this invention. The principal part sectional view showing the secondary side winding of the high voltage transformer concerning an embodiment of the invention. The graph which shows the experimental result of the high voltage | pressure transformer concerning embodiment of this invention. The principal part sectional drawing which shows the secondary side coil | winding of the high voltage transformer concerning the modification of embodiment of this invention. The fragmentary top view which shows the one layer part of the 2nd coil | winding of the high voltage | pressure transformer concerning the modification of embodiment of this invention. The partial plane which shows the state by which one turn of secondary winding was wound around the resin bobbin of the high voltage | pressure transformer concerning the modification of embodiment of this invention. The partial plane which shows the state by which 2 turns of the secondary winding were wound by the resin bobbin of the high voltage | pressure transformer concerning the modification of embodiment of this invention. The fragmentary sectional view which shows the state by which two turns of a secondary winding are wound around the resin bobbin of the high voltage | pressure transformer concerning the modification of embodiment of this invention. The partial plane which shows the state by which 3 turns of the secondary winding were wound by the resin bobbin of the high voltage | pressure transformer concerning the modification of embodiment of this invention. The partial plane which shows the state by which four turns of the secondary winding were wound by the resin bobbin of the high voltage | pressure transformer concerning the modification of embodiment of this invention. The partial plane which shows the state by which five turns of the secondary winding were wound by the resin bobbin of the high voltage | pressure transformer concerning the modification of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inverter transformer 2 Resin bobbin 2A Rib 2B Cylindrical part 3 Primary side winding 4, 104, 204 Secondary side winding 4A, 104 １０４ side bank part 104B Aligned winding part 4b 鍔 side bank angle 5 I type core 6 U Character core

Claims (2)

The core,
A substantially straight cylindrical portion provided so as to wrap around the core, and an axis of the cylindrical portion provided extending from the outer periphery of the cylindrical portion in a direction perpendicular to the axial direction of the cylindrical portion. A bobbin provided with a flange that divides the outer periphery of the cylindrical part in a direction into a primary bobbin region and a secondary bobbin region;
A primary winding made of a conductive wire and wound around the primary bobbin region of the bobbin;
A secondary winding wound around the secondary bobbin region of the bobbin made of a conductive wire,
The secondary winding is
In the circumferential direction of the tubular portion, the outer surface of the tubular portion is layered on the outer periphery of the tubular portion so as to have an opposite bank angle that approaches the outer periphery of the tubular portion as it is separated from the flange portion in the axial direction of the tubular portion. The portion of the secondary winding that is wound by the bank winding and faces the flange in the axial direction of the cylindrical portion is separated from the flange in the axial direction of the cylindrical portion. a flange-side bank portion having a flange-side bank angle such as to be separated from the outer periphery of,
The circumferential direction of the cylindrical portion toward the axial direction of the cylindrical portion from the flange portion to the flange side bank portion between the flange portion and the flange side bank portion on the outer periphery of the cylindrical shape portion And an aligned winding portion wound in a spiral shape ,
The collar side bank angle of the collar side bank portions state, and are less than 20 ° greater than 0 ° a direction away from the collar portion to a axial direction of the cylindrical shape portion as a reference,
When the number of layers of the aligned winding portion is counted in a direction perpendicular to the axial direction of the cylindrical portion, the aligned winding portion forms a single layer or a direction perpendicular to the axial direction of the cylindrical portion. A high-voltage transformer comprising a plurality of layers having a number of layers within 20% of the maximum number of layers when the number of layers of the secondary winding is counted . The core,
  A substantially straight cylindrical shape portion provided with at least a first surface and a second surface facing each other so as to surround the core, and a direction perpendicular to the axial direction of the cylindrical shape portion from the outer periphery of the cylindrical shape portion A bobbin provided with a flange that extends to the axial direction of the tubular portion and divides the outer periphery of the tubular portion into a primary bobbin region and a secondary bobbin region;
  A primary winding made of a conductive wire and wound around the primary bobbin region of the bobbin;
  A secondary winding wound around the secondary bobbin region of the bobbin made of a conductive wire,
  The secondary side winding includes a first turn portion wound around the cylindrical shape portion at a plurality of equal pitches from one end side in the axial direction to the other end side of the cylindrical shape portion; A second turn portion wound a plurality of times at the same pitch as the first turn portion from the other end side in the axial direction toward the one end side as the outer peripheral side turn portion on the first surface; At least three turns of the third turn part wound around the first surface from the one end side in the axial direction toward the other end side at a constant pitch with the first turn part. Wound around multiple turns with a section,
  On the side surface connecting the first surface and the second surface, the secondary side windings of the plurality of turn portions are arranged offset from each other in the axial direction,
  The intersection of one turn part and another turn part is located on the first surface,
  The interval between the secondary windings in one pitch of the first turn portion is configured to be equal to or greater than the product of the diameter of the secondary winding and the number obtained by subtracting one from the number of multiple turn portions,
  The portion of the secondary winding facing the flange in the axial direction of the tubular portion is separated from the outer periphery of the tubular portion as it is separated from the flange in the axial direction of the tubular portion. Having a heel side bank portion having a heel side bank angle;
  The high-pressure transformer characterized in that the bank side bank angle of the bank side bank portion is greater than 0 ° and not more than 20 ° with respect to the axial direction of the cylindrical portion and the direction away from the flange portion. .

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