JP2005158927A - Leakage transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leakage transformer capable of reducing a mounting area and capable of ensuring insulation even in a small mounting area.
A leakage transformer 10 in which electromagnetic induction is performed between a primary winding 90 and a secondary winding 91, and the primary winding 90 and the secondary winding 91 are housed in cores 20 and 80. The number of winding frame portions 34 corresponding to the number of turns of the plurality of secondary windings 91 is equal to or more than the number of winding frame portions 34, and the winding frame portions 34 are arranged in a direction perpendicular to the plane formed by the winding direction of the secondary winding 91. A primary coil bobbin having a winding frame portion 72 around which the primary winding 90 is wound is disposed on the outer peripheral side of the multi-stage coil bobbin 30. A secondary winding 91 is wound around each winding frame portion 34 of the multi-stage coil bobbin 30, and a primary winding 90 is wound around the winding frame portion 72 of the primary coil bobbin.
[Selection] Figure 1

Description

  The present invention relates to a leakage transformer used in, for example, a DC / AC inverter circuit used in a lighting circuit of a backlight discharge lamp in a display device of a TV monitor or a personal computer.

  A display device such as a personal computer includes a lighting circuit for a backlight discharge lamp. In this lighting circuit, a leakage transformer for driving the display device by increasing the voltage is generally used.

  As this type of leakage transformer, for example, there is a configuration described in Patent Document 1. The configuration of Patent Document 1 discloses a configuration in which two secondary windings are arranged side by side and the primary winding is wound in a state of reaching the upper part of two secondary windings. ing

JP 2002-299134 A (see FIGS. 5 and 6)

  As described above, in the leakage transformer having the configuration described in Patent Document 1, the two secondary windings are arranged in a state of being arranged in the plane direction. For this reason, the above-described leakage transformer occupies a large area in the planar direction. That is, when the leakage transformer is mounted on a circuit board of an electronic device, there is a problem that the mounting area becomes large.

  The present invention has been made on the basis of the above circumstances, and an object of the present invention is to provide a leakage transformer capable of reducing the mounting area and ensuring insulation even in a small mounting area. It is intended to provide.

  In order to solve the above problems, the present invention performs electromagnetic induction between the primary winding and the secondary winding, and in the leakage transformer in which these primary winding and secondary winding are housed in the core, It has more than the number of winding frame parts corresponding to the winding of a plurality of secondary windings, and the winding frame parts are arranged in a state perpendicular to the plane formed by the winding direction of the secondary windings. A multi-stage coil bobbin, and a primary coil bobbin disposed on the outer peripheral side of the multi-stage coil bobbin and having a winding frame portion around which the primary winding is wound. The secondary winding is wound around each of the sections, and the primary winding is wound around the winding frame portion of the primary coil bobbin.

  In such a configuration, the secondary winding is wound around each of the winding frame portions of the multi-stage coil bobbin. When a plurality of secondary windings are wound, the secondary windings are arranged in a state of being arranged in the vertical direction. Further, a primary coil bobbin is disposed on the outer peripheral side of the multi-stage coil bobbin around which a plurality of secondary windings are wound, and the primary winding is wound around the primary coil bobbin. As a result, the primary windings are arranged in proximity to the plurality of secondary windings. Thereby, when an alternating current flows through the primary winding, an alternating current can be generated in each secondary winding.

  By adopting such a configuration in which a plurality of secondary windings are wound around one multi-stage coil bobbin, the area occupied by the secondary windings in the plane direction can be reduced. Therefore, when the leakage transformer is mounted on the circuit board of the electronic device, the mounting area can be reduced. Thereby, the electronic device can be miniaturized and the degree of freedom in designing the electronic device can be improved. Further, when the number of secondary windings is made equal, an AC voltage having an equivalent voltage can be generated from each secondary winding.

  According to another invention, a plurality of secondary windings are provided in a leakage transformer in which electromagnetic induction is performed between a primary winding and a secondary winding and the primary winding and the secondary winding are housed in a core. A plurality of stages having a plurality of winding frame portions corresponding to the winding of the wire and arranged in a state perpendicular to the plane formed by the winding direction of the secondary winding. A coil bobbin is provided, and a secondary winding is wound around each winding frame portion of the multi-stage coil bobbin.

  In such a configuration, the secondary winding is wound around each of the winding frame portions of the multi-stage coil bobbin. When a plurality of secondary windings are wound, the secondary windings are arranged in a state of being arranged in the vertical direction. Thereby, the area which a secondary winding occupies in a plane direction can be made small. Therefore, when the leakage transformer is mounted on the circuit board of the electronic device, the mounting area can be reduced. Thereby, the electronic device can be miniaturized and the degree of freedom in designing the electronic device can be improved.

  Furthermore, another invention provides a plurality of secondary windings in a leakage transformer in which electromagnetic induction is performed between a primary winding and a secondary winding, and the primary winding and the secondary winding are housed in a core. A large number of winding frame portions corresponding to the number of windings of the wire and many winding frame portions arranged in a direction perpendicular to the plane formed by the winding direction of the secondary winding A step coil bobbin is provided, and a primary winding is wound around at least one of the winding frame portions of the multi-stage coil bobbin, and a winding frame portion other than the winding frame portion around which the primary winding is wound The secondary winding is wound.

  When configured in this way, not only a plurality of secondary windings but also primary windings are wound around each of the winding frame portions of the multi-stage coil bobbin. That is, the primary winding is also overlapped in a direction perpendicular to the plane formed by the winding direction of the secondary winding. For this reason, it is not necessary to dispose the primary coil bobbin on the outer peripheral side of the multi-stage coil bobbin, and the diameter of the leakage transformer can be reduced. In addition, the mounting area of the electronic device on the circuit board can be further reduced by reducing the diameter. Thereby, the electronic device can be further reduced in size, and the degree of freedom in designing the electronic device can be further improved.

  According to another invention, in addition to each of the above-described inventions, the multi-stage coil bobbin is a first coil positioned at a lowermost part on a side where the secondary winding is wound and the secondary winding is introduced. And a second winding frame portion that is positioned above the first winding frame portion and has the secondary winding wound thereon.

  In such a configuration, the secondary winding is wound around each of the first winding frame portion and the second winding frame portion. Thereby, an AC voltage having a predetermined voltage can be generated from each secondary winding.

  Further, according to another invention, in addition to each of the above-described inventions, the multi-stage coil bobbin further includes three winding frame portions, and is a side where the secondary winding is introduced among the three winding frame portions. A secondary winding is provided on the first winding frame portion located in the lower portion and the second winding frame portion positioned above the first winding frame portion in a state adjacent to the first winding frame portion. Are respectively wound, and the primary winding is wound around the third winding frame portion which is the uppermost winding frame portion among the three winding frame portions.

  When configured in this manner, the secondary winding, the secondary winding, and the primary winding are arranged from below. In this case, the secondary winding wound around the second winding frame portion is closer to the primary winding than the secondary winding wound around the first winding frame portion. Therefore, in the case of the same number of windings, the alternating voltage generated in the secondary winding wound around the second winding frame portion has a larger amount of entering magnetic flux and less magnetic flux leakage. Thereby, the voltage value of the secondary winding wound around the second winding frame is higher. In addition, since the primary winding is stacked in a direction perpendicular to the plane formed by the winding direction of the secondary winding, there is no need to arrange the primary coil bobbin on the outer peripheral side of the multi-stage coil bobbin, and the leakage transformer can be reduced in diameter. It becomes possible to plan. Further, by reducing the diameter, the mounting area of the electronic device on the circuit board can be further reduced, the electronic device can be further reduced in size, and the degree of freedom in designing the electronic device can be further improved. .

  In addition to the above-described inventions, in another invention, the lower end portion constituting the first winding frame portion is provided with start and end points of a plurality of secondary windings and start and end points of the primary windings. A terminal for binding is integrally provided.

  When configured in this manner, the terminals provided integrally with the lower collar part are respectively entangled with the start and end of the primary winding and the secondary winding. In this case, since the terminal is provided integrally with the lower arm, it becomes easy to mount the leakage transformer on the circuit board.

  Furthermore, in addition to the above-described inventions, the other invention further includes a reel portion that is positioned above the first reel portion or the second reel portion and around which the secondary winding is wound. A guide groove for guiding the secondary winding to the bottom surface of the winding frame portion is provided in the lower flange portion.

  When configured in this way, the secondary winding is wound around at least the winding frame portion positioned above the first winding frame portion of the winding frame portion around which the secondary winding is wound. The At that time, it is possible to satisfactorily guide the secondary winding to the bottom surface of the upper winding frame portion through the guide groove. In this case, the secondary winding can be satisfactorily guided to the bottom surface, so that the winding start portion of the secondary winding with respect to the upper winding frame portion can be prevented from hindering winding. It is possible to make good use of the space of the section.

  In addition to the above-described inventions, in another invention, the guide groove is further provided with an inlet for introducing the secondary winding and a groove outlet continuous with the bottom surface of the winding frame portion. The bottom surface of the guide groove is directed toward the inner diameter side of the multi-stage coil bobbin as it goes from the groove outlet to the groove outlet.

  In such a configuration, the secondary winding gradually moves toward the inner diameter side of the multi-stage coil bobbin as it goes from the inlet to the groove outlet. Therefore, the secondary winding can be well guided toward the upper winding frame.

  Further, according to another invention, in addition to each of the above-described inventions, an insulating cover is attached to the multi-stage coil bobbin, and the insulating cover is at least positioned above the first winding frame. The secondary winding to be wound with respect to the guide is guided, and the insulating cover is insulative with respect to a frame portion other than the winding frame portion around which the secondary winding is wound. .

  In the case of such a configuration, the secondary winding is guided by the insulating cover toward the winding frame portion positioned above the first winding frame portion. At that time, the secondary winding can be insulated from the other winding frame by the insulating cover. Thereby, even when a multi-stage coil bobbin is used, the secondary winding can be satisfactorily wound around each winding frame portion. Further, for example, it is possible to prevent a short circuit with the secondary winding wound around the first winding frame portion, and it is possible to prevent the leakage transformer from being damaged.

  According to another invention, in addition to the above-mentioned inventions, the insulating cover is further provided with a first insulation provided between the starting end of the secondary winding and a winding frame portion around which the secondary winding is wound. A cover and a second insulating cover provided between the winding frame and the end of the secondary winding are provided.

  In such a case, the secondary winding uses the first insulating cover to maintain the insulation with respect to the first winding frame and the like from the start end of the secondary winding to the second winding. Guided toward the frame side. In addition, the secondary winding uses the second insulating cover to maintain insulation from the first winding frame and the like toward the end of the secondary winding from the second winding frame. Guided. Therefore, the start end side and the end end side of the secondary winding are separated from the winding frame portion positioned above the first winding frame portion. Thereby, it can guide, preventing the short circuit between the starting end side and termination | terminus side of a secondary winding mutually.

  Furthermore, in addition to the above-described inventions, the multistage coil bobbin further protrudes from one side surface, and the first terminal block on which the start end of the secondary winding is entangled and one side surface And a second terminal block that protrudes from the other side surface opposite to the end of the secondary winding and on which the end of the secondary winding is bound.

  In such a configuration, the start and end of the secondary winding are entangled with terminals provided on separate terminal blocks, respectively. Therefore, the start end and the end of the secondary winding having a large potential difference can be positioned at different parts, and the secondary winding can be prevented from being short-circuited.

  According to the present invention, the mounting area of the leakage transformer can be reduced. Further, even in a small mounting area, insulation in the leakage transformer can be reliably achieved.

(First embodiment)
Hereinafter, the leakage transformer according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view showing the configuration of the leakage transformer 10, and FIG. 2 is a perspective view showing the entire leakage transformer 10. 3 is a plan view of the leakage transformer 10, FIG. 4 is a side view, FIG. 5 is a front view, and FIG. 6 is a rear view. FIG. 7 is a side sectional view of the leakage transformer 10.

  As shown in FIG. 1, the leakage transformer 10 includes a case core 20, a two-stage coil bobbin 30, a first insulating cover 50, a second insulating cover 60, a primary coil bobbin 70, and a lid core 80. As a component.

  Among these, the case core 20 and the lid core 80 are made of a magnetic material having an insulating property. An example of the magnetic material is a nickel-based ferrite core. However, the material of the case core 20 and the lid core 80 is not limited to this, and other magnetic materials such as permalloy may be used. Further, the two-stage coil bobbin 30 and the primary coil bobbin 70 are made of an insulating and non-excited material such as resin.

  As shown in FIG. 1, the case core 20 is an element constituting a part of the core, and is formed in a rectangular parallelepiped shape whose planar shape is a substantially rectangular shape. Further, the case core 20 has side walls 21 at both ends in the longitudinal direction (substantially left and right directions in FIGS. 1 to 4), and a portion surrounded by the side walls 21 is provided with a two-stage coil bobbin 30 or the like. The concave portion 22 is formed. Therefore, although the recessed portion 22 is closed by the side walls 21 at both ends in the longitudinal direction of the case core 20, the edge portion of the case core 20 in the short direction (substantially up and down direction in FIG. 3) is opened. ing.

  The case core 20 is provided with a single column base 23. The column base part 23 protrudes upward from a substantially central part of the recessed part 22. The column base 23 is inserted into the center hole 30 a of the two-stage coil bobbin 30.

  In the following description, the upper side refers to the side on which the lid core 80 is attached as viewed from the bottom surface 20a of the case core 20. Further, the lower side refers to the bottom surface 20 a side of the case core 20 when viewed from the attachment side of the lid core 80.

  Further, the two-stage coil bobbin 30 as a multi-stage coil bobbin includes a winding part 31 for winding the secondary winding 91 and an integral part of the winding part 31 as shown in FIGS. The first terminal block 32 and the second terminal block 33 are provided.

  The winding part 31 has a substantially circular planar shape. Further, the winding part 31 is provided with a lower collar part 31a, a middle collar part 31b, and an upper collar part 31c sequentially from the bottom to the top. Here, a portion surrounded by the lower collar portion 31a and the middle collar portion 31b is a first winding frame portion 34a around which the secondary winding 91 is wound. Moreover, the site | part enclosed by the middle collar part 31b and the upper collar part 31c becomes the 2nd winding frame part 34b, and the secondary winding 91 is also wound here.

  Moreover, the lower collar part 31a, the middle collar part 31b, and the upper collar part 31c are provided so that the planar shape may become a substantially circular shape. In addition, the lower collar portion 31a, the middle collar portion 31b, and the upper collar portion 31c are arranged in the vertical direction, so that the shape of the winding portion 31 is a pulley shape in which the outer shape has two dents. (See FIGS. 1, 8 and 9).

  In the following description, in order to distinguish the two secondary windings 91, the secondary winding 91 wound around the first winding frame portion 34a is referred to as a secondary winding 91a (see FIG. 7). ). Further, the secondary winding 91 wound around the second winding frame portion 34b is referred to as a secondary winding 91b. Moreover, when these both secondary windings 91a and 91b are named generically, they are simply referred to as the secondary winding 91.

  Further, as shown in FIG. 8, the middle collar portion 31b is provided with middle collar recesses 36a and 36b that are recessed from the outer peripheral surface of the middle collar portion 31b. Among these, the first insulating cover 50 is fitted into the middle collar recess 36a, and the second insulating cover 60 is fitted into the middle collar recess 36b. The fitting is performed after the secondary winding 91a is wound around the first winding frame portion 34a, as will be described later.

  Also, as shown in FIGS. 8 and 9, a guide groove 37 is provided in the middle collar portion 31b. The guide groove 37 is a part for guiding the secondary winding 91b guided by the first insulating cover 50 fitted in the intermediate recess 36b to the second winding frame part 34b. In order to improve the guide, the height position of the bottom surface 37c of the guide groove 37 is gradually inclined toward the inner diameter side of the two-stage coil bobbin 30 from the groove inlet 37a toward the groove outlet 37b. . In order to guide the secondary winding 91b entering from the groove entrance 37a of the guide groove 37 to the second winding frame part 34b side, a groove on the side away from the intermediate recess 36a in the guide groove 37 is provided. An outlet 37b is provided.

  Here, in the present embodiment, the height position of the recess bottom surface 36a1 of the intermediate collar recess 36a protrudes toward the outer diameter side rather than the bottom surface 34b1 of the second winding frame portion 34b. Therefore, the height position of the bottom surface 37c is inclined so as to be directed toward the inner diameter side as the distance from the intermediate recess 36a side increases. The height position in the radial direction of the bottom surface 37c near the groove outlet 37b is approximately the same as the height position in the radial direction of the bottom surface 34 of the second winding frame portion 34b.

  In addition, in order to form the above-described guide groove 37, the middle collar portion 31b is provided to have the widest width (the height is higher in the paper surface direction) than the lower collar portion 31a and the upper collar portion 31c. It has been.

  Further, a protrusion 37d is provided in the vicinity of the groove outlet 37b in the middle collar portion 31b. The protrusion 37d protrudes toward the outer diameter side. The protrusion 37d is a portion for guiding the winding machine nozzle when the secondary winding 91b is wound around the second winding frame portion 34b. The protrusion 37d is a member for positioning with respect to the two-stage coil bobbin 30 when the primary coil bobbin 70 is attached.

  In correspondence with the projection 37d, the primary coil bobbin 70 described later is provided with a longitudinal groove corresponding to the insertion of the projection 37d on the inner wall surface thereof. Further, the upper collar portion 31c may be provided with a projection similar to the projection 37d.

  Also, the lower collar part 31a is provided with lower collar recesses 35a and 35b that are recessed from the outer peripheral surface of the lower collar part 31a. The lower collar recesses 35a and 35b are disposed along the same straight line as the above-described middle collar recesses 36a and 36b in the vertical direction. The first insulating cover 50 and the second insulating cover 60 are also fitted into the lower collar recesses 35a and 35b, respectively. In addition, a lead-out portion 43c described later is provided in the vicinity of the lower collar recess 35a.

  Further, the first terminal block 32 and the second terminal block 33 are located below the winding portion 31 in FIG. The first terminal block 32 protrudes to the near side in FIG. 1 and to the lower side in FIG. The first terminal block 32 is provided with a side surface 32a, a side surface 32b, and a side surface 32c. Among these, the side surface 32 a is a side surface orthogonal to the short direction of the leakage transformer 10.

  Further, the side surfaces 32b and 32c are provided so as to make a predetermined angle α (hereinafter referred to as an inclination angle α) with respect to a straight line along the side surface 32a. The inclination angle α is 45 degrees in the present embodiment. However, the inclination angle α is not limited to 45 degrees, and can be set to an appropriate inclination angle similarly to the inclination angle of the binding terminal 40 described later. Moreover, as shown in FIG. 1, the side surfaces 32b and 32c are provided in the part of the both ends side of the side surface 32a.

  As shown in FIGS. 3 and 8, the terminal 38 protrudes from the side surface 32 a. In the present embodiment, for example, seven terminals 38 are provided. In the following description, when the terminals 38 are individually called, they are any of the terminals 38a to 38g. These seven terminals 38a to 38g have a downward projecting portion 39a that descends downward, and a surface mounting portion 39b whose lower end side is substantially horizontal with respect to the installation site. And by soldering between each terminal 38a-38g and an installation site | part, the terminals 38a-38g and the circuit board of an installation site | part are electrically connected. The number of terminals 38 is not limited to seven, and can be variously changed, for example, five.

  In the present embodiment, among the terminals 38b to 38f, one end side and the other end side of the primary winding 90 are bound to a predetermined terminal 38. In the following description, the terminals 38b to 38f are referred to as primary side terminals 38b to 38f. As will be described later, the terminals 38a and 38g are ground terminals 38a and 38g. However, when calling both together, they are simply terminals 38a-38g.

  One end side or the other end side of the primary winding 90 is wound around two of the primary side terminals 38b to 38f. Of these primary-side terminals 38b to 38f, two of which the one end side and the other end side are entangled can be selected as appropriate.

  Moreover, as shown in FIGS. 1-6, the binding terminal 40 protrudes from the two side surfaces 32b and 32c. The binding terminal 40 protrudes toward the normal direction of the side surfaces 32b and 32c. In addition, the binding terminal 40 which exists in the side surface 32b among the binding terminals 40 is called the binding terminal 40a. Moreover, the binding terminal 40 which exists in the side surface 32c among the binding terminals 40 is called the binding terminal 40b. However, when both are collectively referred to, they are simply referred to as the binding terminals 40.

  In the present embodiment, the side surfaces 32 b and 32 c form about 45 degrees with respect to the short direction of the leakage transformer 10. Therefore, the binding terminal 40 is arranged so as to make about 45 degrees with respect to the terminals 38a to 38g. That is, as shown in FIG. 3, the inclination angle α formed by the direction of the tip of the binding terminal 40 with the side surface 32a is about 45 degrees.

  Note that the inclination angle α is not limited to about 45 degrees, and is an angle that generates a predetermined gap with respect to the ground terminal 38 a that is close to the binding terminal 40, and one end side of the secondary winding 91 is Any angle range may be used as long as it can be satisfactorily bound. Examples of the range of the inclination angle α include a range of 20 to 90 degrees.

  Moreover, if the inclination angle α is in the range of 30 to 60 degrees, the front end side of the binding terminal 40 is effectively expanded with respect to the front end side of the ground terminal 38a. Therefore, the secondary winding 91 can be satisfactorily wound around the binding terminal 40. Further, the binding terminal 40 is not limited to the configuration protruding in the normal direction of the side surfaces 32b and 32c, and may be configured to protrude obliquely with respect to the normal direction of the side surfaces 32b and 32c.

  Further, when the inclination angle α is about 90 degrees, the binding terminal 40 cannot be said to protrude in an oblique direction with respect to the terminals 38a to 38g, but in the present embodiment, about 90 degrees. In this case, it is included in the oblique protrusion.

  As shown in FIGS. 4 and 5, the binding terminal 40 protrudes outward from a height position substantially the same as the terminals 38 a to 38 g. However, the binding terminal 40 is smaller in size than the terminals 38a to 38g. That is, the binding terminal 40 has a projecting length shorter than the terminals 38a to 38g, a smaller width dimension, and a smaller height dimension. However, the binding terminal 40 has a sufficient size for winding the secondary winding 91 a predetermined number of times.

  Further, the binding terminal 40 is electrically connected to the ground terminal 38a. In this case, the binding terminal 40 and the ground terminal 38a may be, for example, a metal integrally molded product, or may be connected to each other via a separate conducting wire or the like. The ground terminal 38a is connected to the ground side of a circuit board (not shown). For this reason, the binding terminal 40 is provided as a reference for the potential.

  Further, the second terminal block 33 is a portion protruding in the rear side in FIGS. 1 and 2 and in the upper side of the drawing in FIG. In the present embodiment, two second terminal blocks 33 are provided. As shown in FIGS. 3, 5, 6, and 8, in the same manner as the first terminal block 32, the second terminal block 33 has an outer diameter side as viewed from the center of the two-stage coil bobbin 30. A terminal 41 protrudes from the side surface. In the present embodiment, for example, four terminals 41 are provided. In the following description, when the terminals 41 are individually called, they are referred to as terminals 41a to 41d. Further, if necessary, of the second terminal blocks 33, the second terminal block 33 located on the left side in FIG. 3 is referred to as a second terminal block 33a, and the second terminal block 33 located on the right side in FIG. The terminal block 33 is referred to as a second terminal block 33b. Further, there is no need to distinguish between them, and when they are collectively referred to, they are simply referred to as the second terminal block 33.

  Of the four terminals 41a to 41d described above, terminals 41b and 41c having a short protruding length are provided on the inner side, and terminals 41a and 41d having a long protruding length are provided on the outer side. Of these terminals 41b and 41c, the other end side of the secondary winding 91 is wound on one side. In the following description, the terminals 41b and 41c with which the other end of the secondary winding 91 is entangled are particularly referred to as entangled terminals 41b and 41c. In the present embodiment, the other end side of the secondary winding 91 is entangled in both the binding terminal 41b and the binding end 41c.

  The terminal 41a and the binding terminal 41b are electrically connected to each other, and the binding terminal 41c and the terminal 41d are electrically connected to each other. Therefore, the secondary winding 91 excited by the primary winding 90 outputs a predetermined potential from the binding terminal 41b to the terminal 41a and from the binding terminal 41c to the terminal 41d. Further, since the terminal 41a and the terminal 41d are respectively connected on the circuit board, the alternating current generated by the excitation flows to a predetermined circuit existing on the circuit board.

  Similarly to the terminals 38a to 38g described above, the terminals 41a and 41d have a downward projecting portion 42a that descends downward and a surface mounting portion 42b whose lower end side is substantially horizontal with respect to the installation site. ing.

  Also, as shown in FIGS. 6 and 8, a plurality of lead-out portions 43 are provided on the back side of the first terminal block 32 and the second terminal block 33. When the lead-out portion 43 leads the secondary winding 91 from the winding portion to the external binding terminal 40 and any of the binding terminals 41b and 41c, the lead wire ( It is a recessed part (notch part) in which an unillustrated) is located. The lead-out portion 43 is provided with a protrusion 44. The protrusion 44 is a portion that can receive the conductive wire on the outer surface side thereof.

  In addition, as shown in FIG. 8, when distinguishing the derivation | leading-out part 43 in the following description, the thing near the lower collar recessed part 35b among the derivation | leading-out parts 43 which exist in the 1st terminal block 32 is called the derivation | leading-out part 43a, A part far from the lower collar recess 35b is referred to as a lead-out part 43b. Further, among the derivation portions 43 existing in the second terminal block 33, those close to the lower collar recess 35a are referred to as derivation portions 43c, and those far from the lower collar recess 35a are referred to as derivation portions 43d.

  In the following description, when distinguishing the protrusions 44, the protrusions 44 existing on the lead-out part 43a are called protrusions 44a, and the protrusions 44 existing on the lead-out part 43b are called protrusions 44b. Further, the projection 44 existing in the lead-out portion 43c is called a projection 44c, and the projection 44 existing in the lead-out portion 43d is called a projection 44d.

  Moreover, as shown in FIG. 8, the protrusion pin 45 is provided in the internal diameter side of the derivation | leading-out parts 43a-43d. The protruding pin 45 is also a part for hooking the secondary winding 91, similarly to the above-described protrusion 44. In the following description, if necessary, the protruding pin 45 existing in the lead-out portion 43a is replaced with the protruding pin 45a, the protruding pin 45 present in the lead-out portion 43b is set as the protruding pin 45b, and the protruding pin 45 present in the lead-out portion 43c is replaced. The protruding pin 45c and the protruding pin 45 existing in the lead-out portion 43d are referred to as a protruding pin 45d.

  Further, as shown in FIGS. 6 and 8, a notch 46 is provided at a portion between the pair of second terminal blocks 33a and 33b. The conducting wire disposed in the above-described lead-out portion 43 is located in the cutout portion 46, and the lead wire passes through the cutout portion 46 and is led out toward the first winding frame portion 34a. Further, as shown in FIGS. 1 and 10, a pair of fittings recessed toward the central axis (not shown) along the longitudinal direction of the case core 20 on the bottom surface 20a of the case core 20 from the side wall 21 side. A recess 24 is provided. The first terminal block 32 or the second terminal block 33 is fitted into the fitting recess 24.

  Moreover, as shown in FIG. 1, the 1st insulating cover 50 as an insulating cover is engage | inserted in the state in which the back surface contacts the middle collar recessed part 36a and the lower collar recessed part 35a. Therefore, the back surface of the first insulating cover 50 is formed in a shape that follows the middle collar recess 36a and the lower collar recess 35a. The first insulating cover 50 is provided with a groove 51 that is recessed from other portions of the first insulating cover 50. In the groove 51, the secondary winding 91b is located. The groove 51 is arranged along the vertical direction (the direction connecting the case core 20 and the lid core 80).

  A projection 52 is provided in the vicinity of the groove 51. The protrusion 52 is a part that hooks or winds the secondary winding 91b when the secondary winding 91b is turned to face the guide groove 37. Due to the presence of the protrusion 52, the secondary winding 91 b is not detached from the groove 51. The protrusion 52 is provided on the upper side of the groove 51.

  In addition, a corner cutout portion 53 in which a corner portion of the first insulating cover 50 is broken in a substantially rectangular shape is provided below the first insulating cover 50 and on the left side in FIG. The corner cutout portion 53 is a cutout portion for preventing the lower collar portion 31a and the second terminal block 33a from interfering with the first insulating cover 50.

  Further, as shown in FIG. 12, the second insulating cover 60 as an insulating cover is also fitted in a state in which the back surface thereof is in contact with the middle collar recess 36b and the lower collar recess 35b, similarly to the first insulation cover 50 described above. . For this reason, the back surface is formed in a shape that follows the middle collar recess 36b and the lower collar recess 35b. The second insulating cover 60 is also formed with a groove 61 and a protrusion 62. The protrusion 62 is also provided on the upper side of the groove 61. The second insulating cover 60 is provided with a lead-out guide portion 63. The lead-out guide portion 63 is a portion of the second insulating cover 60 for receiving the secondary winding 91b by first reaching the secondary winding 91b.

  In the present embodiment, the groove 61 is formed such that the upper side thereof is a substantially triangular groove and the lower side thereof is a substantially circular groove.

  Further, a primary coil bobbin 70 is disposed outside the two-stage coil bobbin 30, the first insulating cover 50 and the second insulating cover 60 attached to the two-stage coil bobbin 30. A central hole 70 a is provided in the central portion of the primary coil bobbin 70. The above-described two-stage coil bobbin 30 is fitted into the center hole 70a. Therefore, the center hole 70a has an inner diameter corresponding to the outer diameters of the outer peripheral portions of the lower collar portion 31a, the middle collar portion 31b, and the upper collar portion 31c of the above-described two-stage coil bobbin 30.

  Further, as shown in FIG. 1, the primary coil bobbin 70 has a lower flange portion 71a and an upper flange portion 71b, and one winding frame portion 72 is provided therebetween. That is, the external appearance of the primary coil bobbin 70 has a substantially pulley shape. Moreover, the intermittent part 73 is provided in the lower collar part 71a. This intermittent part 73 is arrange | positioned in the state which goes to the 1st terminal block 32 side.

  The primary coil bobbin 70 is fitted into the recessed portion 22 of the case core 20 together with the two-stage coil bobbin 30. In this case, the primary coil bobbin 70 is located on the outer peripheral side of the two-stage coil bobbin 30 and has an outer diameter larger than that of the two-stage coil bobbin 30. Therefore, the inner diameter of the recessed portion 22 is also made slightly larger than the primary coil bobbin 70 so as to correspond to the outer diameter of the primary coil bobbin 70.

  Further, the primary coil bobbin 70 is provided with a vertical groove (not shown) on the inner wall surface constituting the central hole 70a. The primary coil bobbin 70 is positioned in the radial direction by fitting the projection 37d into the vertical groove. Further, in the primary coil bobbin 70, the portion into which the first insulating cover 50 and the second insulating cover 60 are fitted has a protruding portion 74 in which the cylindrical wall protrudes to the outer diameter side than the other portions.

  In addition, a lid core 80 serving as a component of the core is positioned on the upper portion of the case core 20. For example, as shown in FIG. 7, the lid core 80 has a recess 81 corresponding to the recess 22 described above. The recessed portion 81 is provided with a protruding portion 82 having a short protruding length so as to face the column base portion 23 described above. The protrusion 82 faces the column base 23 with a slight gap in a state where the lid core 80 is attached to the case core 20.

  In the present embodiment, the protrusion 82 is not inserted into the center hole 30 a of the two-stage coil bobbin 30. However, the projecting portion 82 may also be configured to be inserted into the center hole 30 a of the two-stage coil bobbin 30 together with the column base portion 23. In this case, the height position of the upper end surface of the two-stage coil bobbin 30 may be made higher than the upper end of the column base 23. In this way, since the protrusion 82 is inserted into the center hole 30a, it is possible to prevent the lid core 80 from shifting.

  Moreover, it is good also as a flat structure, without providing the protrusion part 82 etc. in the recessed part 81 of the lid | cover core 80. FIG. In this case, the column base 23 may be slightly shorter than the side wall 21, and a gap may be formed between the column base 23 and the lid core 80.

  A method for manufacturing the leakage transformer 10 having the above configuration will be described below.

  First, one end side of the secondary winding 91a is bound to the binding terminal 41c (see FIG. 6). Following this binding, the secondary winding 91a is pulled out, and the secondary winding 91a is positioned in the lead-out portion 43d. Further, the secondary winding 91a is hooked on the protrusion 44d, subsequently hooked on the protruding pin 45d, and then changed in direction toward the notch 46. After this direction change, the secondary winding 91a passes through the notch 46 and enters the first winding frame 34a. Note that the secondary winding 91a is wound around the first winding frame portion 34a, for example, clockwise in FIG. However, the winding direction of the secondary winding 91a may be counterclockwise in FIG.

  When the secondary winding 91a is sufficiently wound around the first winding frame portion 34a, the secondary winding 91a is led out of the first winding frame portion 34a. In this case, the secondary winding 91a is a peripheral portion (left side in FIG. 6) opposite to the side where the first insulating cover 50 and the second insulating cover 60 are provided, and in the vicinity of the first terminal block 32. Derived from the outside. After the derivation, the secondary winding 91a is disposed inside the derivation portion 43b and guided to the binding terminal 40b. The secondary winding 91a is entangled with the binding terminal 40b and is disconnected after the wrapping is completed. In this arrangement, the secondary winding 91a is hooked on the protruding pin 45b and the protrusion 44b, but the secondary winding 91a may be wound around the protrusion 44b. As described above, the winding of the secondary winding 91a around the first winding frame portion 34a is completed.

  Next, an operation of winding the secondary winding 91b is performed on the second winding frame portion 34b. Prior to the operation, first, the first insulating cover 50 and the second insulating cover 60 are attached to the lower collar recess 35a and the middle collar recess 36a, and the lower collar part 35b and the middle collar recess 36b, respectively. Thereafter, one end of the secondary winding 91b is bound to the binding terminal 41b. Thereafter, the secondary winding 91b is disposed inside the lead-out portion 43c, and the secondary winding 91b is caught by the protrusion 44c. Further, the secondary winding 91 a is hooked on the projecting pin 45 c, the direction is changed thereafter, and the secondary winding 91 a enters the groove 51.

  After the secondary winding 91b enters the groove 51, the secondary winding 91b is guided so that the groove 51 extends upward from below (see FIG. 11). And in the upper end of the groove part 51, the secondary winding 91b is hooked by the protrusion 52, or it is wound and it changes direction toward the guide groove 37 side. After that, the secondary winding 91b enters the guide groove 37 from the groove inlet 37a (see FIG. 9), the secondary winding 91b is guided to the groove inlet 37a, and the second winding frame portion 34b from the groove outlet 37b. Is extended to the inside.

  When the secondary winding 91b enters the second winding frame portion 34b, the secondary winding 91b is wound clockwise. Note that the winding direction of the secondary winding 91b is not limited to clockwise, but may be wound counterclockwise.

  When the secondary winding 91b is wound around the second winding frame portion 34b by a predetermined number of windings and no further winding is required, the secondary winding 91b is used as a guide for guiding the second insulating cover 60. It rides on the part 63 (refer FIG. 12). Subsequently, the secondary winding 91 b is hooked on the protrusion 62, the direction is changed, and enters the groove 61. Note that the secondary winding 91 b may be wound around the protrusion 62.

  Subsequently, the secondary winding 91 b passes through the groove portion 61 and enters the adjacent lead-out portion 43 a at the lower end of the groove portion 61. At this time, the secondary winding 91b is hooked on the protruding pin 45a, and the direction of the secondary winding 91b is changed (see FIGS. 6 and 8). In this case, the secondary winding 91b may be wound around the protruding pin 45a. Even when the secondary winding 91b reaches the end of the lead-out portion 43a, the secondary winding 91b is hooked or wound around the protrusion 44a. The secondary winding 91b is entangled with the tying terminal 40a. As described above, the winding of the secondary winding 91b around the second winding frame portion 34b is completed.

  Subsequently, the primary coil bobbin 70 is inserted into the two-stage coil bobbin 30 (see FIGS. 1, 2 and 7). As a result, the secondary winding 91 is covered with the primary coil bobbin 70. Subsequently, one end side of the primary winding 90 is bound to any one of the terminals 38b to 38f. Thereafter, the primary winding 90 is guided toward the upper side of the first terminal block 32. The primary winding 90 enters the winding frame portion 72 via the intermittent portion 73. In this case, the primary winding 90 is located at the end of the intermittent portion 73 on the counterclockwise side in FIG.

  In the winding frame portion 72, the primary winding 90 is wound counterclockwise in FIG. When the winding for the predetermined number of turns of the primary winding 90 in the winding frame portion 72 is completed, the primary winding 90 is again guided to the outside of the winding frame portion 72 via the intermittent portion 73. In this case, the primary winding 90 is located at the end of the intermittent portion 73 on the clockwise side.

  Here, the winding direction of the primary winding 90 is not limited to the counterclockwise direction as described above, and may be wound in the clockwise direction. In the case where the primary winding 90 is wound in the clockwise direction, the primary winding 90 is present in the clockwise portion of the intermittent portion 73 at the beginning of the winding of the primary winding 90. . Further, when the primary winding 90 is wound in the clockwise direction, the primary winding 90 exists in the counterclockwise portion of the intermittent portion 73 in the state where the primary winding 90 has been wound. It becomes a state.

  The primary winding 90 extended from the intermittent part 73 is extended | stretched toward the terminals 38b-38f different from either of the terminals 38b-38f mentioned above. Thereafter, the primary winding 90 is entangled with the terminals 38b to 38f, and then the primary winding 90 is disconnected. As described above, the winding of the primary winding 90 is completed.

  Thereafter, the center hole 30a of the two-stage coil bobbin 30 in which the primary coil bobbin 70 is fitted is inserted into the column base 23 (see FIG. 1). As a result, the primary coil bobbin 70 and the two-stage coil bobbin 30 are fitted into the recessed portion 22 (see FIGS. 2 to 5).

  Next, the lid core 80 is attached and fixed to the case core 20 so as to close the recessed portion 22 (see FIGS. 7 and 10). Further, in FIG. 1 and FIG. 2, side wall cores (not shown) may be attached to the near side and the far side to close the near side and the far side of the recessed portion 22. If it does in this way, the open part of the recessed part 22 will be block | closed with a side wall core, and it will reduce that magnetic flux leaks outside.

  By performing the steps as described above, the leakage transformer 10 is in a completed state as shown in FIGS. After the completion of the leakage transformer 10, the tip side of the terminals 38a to 38g, 38a, and 38d is immersed in a solder bath, and solder is applied to the tip side. And alignment between this front end side and the predetermined site | part of a circuit board not shown is performed, and both are joined. In this case, the circuit board side may be joined in a state where solder is applied.

  According to the leakage transformer 10 having such a configuration, the secondary windings 91a and 91b are wound around the first winding frame part 34a and the second winding frame part 34b of the two-stage coil bobbin 30, respectively. The two secondary windings 91 a and 91 b can be arranged so as to overlap in the vertical direction of the two-stage coil bobbin 30. Thereby, the area occupied by the secondary windings 91a and 91b in the plane direction can be reduced. That is, the leakage transformer 10 can be made compact.

  Further, since the area occupied by the secondary windings 91a and 91b in the planar direction can be reduced, the mounting area can be reduced when the leakage transformer 10 is mounted on a circuit board of an electronic device. Thereby, the electronic device can be downsized and the degree of freedom in designing the electronic device can be improved. Further, when the number of windings of the secondary windings 91a and 91b is made equal, alternating currents of the same voltage can be generated from the respective secondary windings 91a and 91b.

  Further, the lower flange portion 31a is integrally provided with binding terminals 40a, 40b, 41b, and 41c for binding the start and end of the secondary windings 91a and 91b. Therefore, the secondary windings 91a and 91b can be easily wound, and the leakage transformer 10 can be easily mounted on the circuit board.

  Further, a guide groove 37 is provided in the middle collar portion 31b. Therefore, it is possible to guide the secondary winding 91b through the guide groove 37 to the bottom surface 34b1 of the second winding frame portion 34b. Thereby, the winding start portion of the secondary winding 91b with respect to the second winding frame portion 34b can be prevented from being hindered from winding in the second winding frame portion 34b. Further, when the secondary winding 91b is wound, the space of the second winding frame portion 34b can be favorably utilized.

  Further, the guide groove 37 is inclined so that the bottom surface 37c of the guide groove 37 is directed toward the inner diameter side of the two-stage coil bobbin 30 from the groove inlet 37a toward the groove outlet 37b. Therefore, the secondary winding 91b can be favorably guided toward the bottom surface 34b1 of the second winding frame portion 34b.

  Further, the first insulating cover 50 and the second insulating cover 60 are attached to the two-stage coil bobbin 30. For this reason, the secondary winding 91b is guided to the second winding frame part 34b through the first insulating cover 50 and the second insulating cover 60, thereby being wound around the first winding frame part 34a. It is possible to maintain an insulation state for the secondary winding 91b. In other words, it is possible to realize a configuration in which the secondary winding 91b is arranged in the vertical direction while not short-circuiting each other. Moreover, damage to the leakage transformer 10 can be prevented by preventing a short circuit.

  Further, since the first insulating cover 50 and the second insulating cover 60 are used, and the two insulating covers 50 and 60 are used, the start end side and the end end side of the secondary winding 91b are separated from each other. Guided at 60. Thereby, it is possible to guide the secondary winding 91b in a state in which a short circuit is prevented.

  Further, the second stage coil bobbin 30 includes a first terminal block 32 having binding terminals 40a and 40b protruding from one side surface of the two-stage coil bobbin 30 and second terminals having binding terminals 41b and 41c. The terminal block 33 protrudes from the other side surface of the two-stage coil bobbin 30. Therefore, the start and end of the secondary windings 91a and 91b having a large potential difference can be positioned at different parts with the two-stage coil bobbin 30 interposed therebetween, and short circuit of the secondary windings 91a and 91b can be prevented. Is possible.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. Note that the leakage transformer 110 in the present embodiment has basically the same configuration as the leakage transformer 10 described in the first embodiment. For this reason, in the present embodiment, the same components as those described in the first embodiment will be described with the same reference numerals.

  In the leakage transformer 110 of the present embodiment, a three-stage coil bobbin 130 is used instead of the two-stage coil bobbin 30 in the first embodiment described above, and the primary coil bobbin 70 is not used. The details will be described below.

  A three-stage coil bobbin 130 as a multi-stage coil bobbin used in the present embodiment is a third stage for newly winding a primary winding 90 above the above-described two-stage coil bobbin 30 as shown in FIG. The winding frame part 34c is provided. That is, the three-stage coil bobbin 130 is provided with a primary upper collar portion 31d in addition to the lower collar portion 31a, the middle collar portion 31b, and the upper collar portion 31c. And between the upper collar part 31c and the upper upper collar part 31d becomes the 3rd winding frame part 34c, and the primary winding 90 is wound by this part.

  In addition, the upper collar portion 31c is provided with a slit (not shown) in the radial direction for hooking the primary winding 90 wound around the third winding frame portion 34c. A pair of the slits are provided to draw out the primary winding 90 when the primary winding 90 is wound around the third winding frame portion 34c or when the winding to the third winding frame portion 34c is completed. At the same time, the primary winding 90 enters. Thereby, the primary winding 90 does not loosen between the third winding frame portion 34c and the terminal, and the winding state can be maintained satisfactorily.

  The configuration of the other parts of the three-stage coil bobbin 130 is the same as the configuration of the two-stage coil bobbin 30 described above. Therefore, a detailed description thereof is omitted. Further, the above-described slit may be omitted, and the primary winding 90 may be guided using an insulating cover similar to the above-described insulating covers 50 and 60.

  Moreover, in this Embodiment, the recessed part 22 is provided so that it may become a diameter smaller than the recessed part 22 in the above-mentioned 1st Embodiment. That is, in the present embodiment, the insertion of the primary coil bobbin 70 into the recessed portion 22 is omitted. For this reason, the recessed part 22 has an inner diameter suitable for the insertion of the three-stage coil bobbin 130.

  A method for manufacturing the leakage transformer 110 having the above configuration will be described below. In the description of this manufacturing method, the description of the same parts as those described in the first embodiment is omitted.

  First, in the same manner as described in the first embodiment, the secondary winding 91a is wound around the first winding frame portion 34a, and then the second winding frame portion 34b is also described above. The secondary winding 91b is wound in the same manner as described in the first embodiment.

  Then, after the winding of the secondary winding 91b around the second winding frame portion 34b is completed, the primary winding 90 is wound around the third winding frame portion 34c. In this case, first, one end of the primary winding 90 is entangled with any of the terminals 38b to 38f, and then the primary winding 90 is inserted into the slit. Thereafter, the primary winding 90 is wound around the third winding frame portion 34c.

  Here, the primary winding 90 may be wound around the third winding frame portion 34c in either the clockwise direction or the counterclockwise direction. It is preferable that the start end side and the end end side of the primary winding 90 are not in contact with each other.

  The primary winding 90 is wound around the slit again after the primary winding 90 is wound around the third winding frame portion 34c by a predetermined number of turns. Then, the primary winding 90 is pulled out toward the terminal side, and the other end side of the position maintaining side winding is different from any of the terminals 38b to 38f in which the starting end side is entangled. Make it entangled against. Thereafter, the remaining side of the primary winding 90 is disconnected. As described above, the winding of the secondary winding 91 and the primary winding 90 is completed.

  Thereafter, as in the case of the first embodiment described above, the column base portion 23 is inserted into the center hole 130a of the three-stage coil bobbin 130, and the three-stage coil bobbin 130 is fitted into the recessed portion 22. Put it in a state. Next, the lid core 80 is attached and fixed to the case core 20 so as to close the recessed portion 22 (see FIG. 13).

  Also in this embodiment, a side wall core (not shown) may be attached to close the near side and the far side of the recessed portion 22. If it does in this way, the open part of the recessed part 22 will be block | closed with a side wall core, and it will reduce that magnetic flux leaks outside.

  According to the leakage transformer 110 having such a configuration, not only the secondary windings 91a and 91b but also the primary winding 90 is wound around each of the winding frame portions 34a to 34c of the three-stage coil bobbin 130. That is, the primary winding 90 is also overlapped in a direction perpendicular to the plane formed by the winding directions of the secondary windings 91a and 91b. For this reason, it is not necessary to arrange the primary coil bobbin 70 on the outer peripheral side of the two-stage coil bobbin 30, and the leakage transformer 110 can be further reduced in diameter and made more compact. In addition, by reducing the diameter, the mounting area of the electronic device on the circuit board can be further reduced, the electronic device can be further reduced in size, and the degree of freedom in designing the electronic device can be further improved. Can do.

  In the present embodiment, in the three-stage coil bobbin 130, the secondary windings 91a and 91b are wound around the first winding frame part 34a and the second winding frame part 34b, respectively, The primary winding 90 is wound around the winding frame portion 34c. Therefore, the secondary winding 91a, the secondary winding 91b, and the primary winding 90 are arranged in the leakage transformer 110 from below. In this case, the secondary winding 91b is closer to the primary winding 90 than the secondary winding 91a, and considering the leakage of magnetic flux, the number of entering magnetic fluxes is large. Thereby, in the case of the same number of windings, the secondary winding 91b wound around the second winding frame portion 34b can have a higher voltage value.

  Although the first and second embodiments of the present invention have been described above, the present invention can be variously modified in addition to this. This will be described below.

  In the first embodiment described above, the case where the two secondary windings 91a and 91b are arranged using the two-stage coil bobbin 30 has been described. However, the number of secondary windings 91 is not limited to two. For example, an n-stage coil bobbin for winding three or more secondary windings 91 (assuming that n secondary windings 91 are used) is used, and the primary coil bobbin 70 is disposed outside thereof. You may do it. Similarly, the second embodiment described above is not limited to the configuration using the three-stage coil bobbin 130, and uses n-stage coil bobbins (n-1 secondary windings 91 (n is 3 or more)). .) May be used.

  In the first and second embodiments described above, a configuration in which the first insulating cover 50 and the second insulating cover 60 are attached to the two-stage coil bobbin 30 is employed. However, when insulation can be achieved between the secondary winding 91a and the secondary winding 91b, a configuration in which the first insulating cover 50 and the second insulating cover 60 are not used can be employed.

  For example, a groove for passing the starting end side of the secondary winding 91b is provided on the center hole 30a side, and an insertion hole for inserting the secondary winding 91b passing through this groove is provided on the bottom surface 34b1 of the second winding frame portion 34b. Provide on the side. Then, after the secondary winding 91b is wound around the second winding frame portion 34b, the terminal end of the secondary winding 91b is once turned upward and the upper end surface of the secondary coil bobbin 30 is directed toward the center hole 30a. To. Further, a groove for passing the end side of the secondary winding 91b is provided on the center hole 30a side, and the secondary winding 91b is guided to the end side through this groove. In this case, without using the first insulating cover 50 and the second insulating cover 60, the two secondary windings 91a, 91a, A configuration in which 91b is arranged in the vertical direction can be realized.

  Further, in the above-described second embodiment, the third winding frame portion 34 c for winding the primary winding 90 is provided on the uppermost portion of the three-stage coil bobbin 130. However, the third winding frame portion 34c is not necessarily limited to the configuration provided at the uppermost portion of the three-stage coil bobbin 130, and may be configured to be provided at the central portion or the lowermost portion. In addition, when providing the 3rd winding frame part 34c in the center part or lowermost part of the three-stage coil bobbin 130, it is necessary to aim at insulation with respect to the 2nd winding frame part 34b etc. which are located upwards from it.

  Further, in the first embodiment described above, a configuration in which the primary coil bobbin 70 having a diameter larger than that of the two-stage coil bobbin 30 is arranged on the outer peripheral side of the two-stage coil bobbin 30 has been described. In the second embodiment described above, the configuration using the three-stage coil bobbin 130 is described. However, the primary coil bobbin 70 is formed to have substantially the same outer diameter and inner diameter as the two-stage coil bobbin 30, the column base 23 is extended, and the two-stage coil bobbin 30 and the primary coil bobbin are extended with respect to the column base 23. You may insert so that 70 may be piled up. Even in this case, similarly to the case of the leakage transformer 110 of the second embodiment described above, the diameter and size of the leakage transformer can be further reduced.

  Further, in each of the above-described embodiments, the terminals 38a to 38g and the terminals 41a and 41d have surface mounting portions 39b and 42b that are surface mounted. However, the terminals 38a to 38g and the terminals 41a and 41d are not limited to the configuration having the surface mounting portions 39b and 42b. For example, a configuration that protrudes downward so as to be inserted into the circuit board may be adopted. good.

  The leakage transformers 10 and 110 are not limited to being used as a backlight discharge lamp in a display device of a notebook personal computer, and can be used in various electronic devices. Examples thereof include a mobile phone device display device, a car navigation display device, a fluorescent lamp, and a PDP.

  Furthermore, in the above-described embodiment, the core includes the case core 20 that is open on the front side and the back side in FIG. However, the core is not limited to this. For example, you may comprise so that the side wall 21 may be provided over the perimeter of the side edge of the case core 20. FIG.

  Further, in the above-described embodiment, the lower collar part 31a, the middle collar part 31b, and the upper collar part 31c are provided so as to extend over substantially the entire circumference. However, the lower collar part 31a, the middle collar part 31b, and the upper collar part 31c need not be provided in this way. For example, it is good also as an intermittent shape which notched the lower collar part 31a, the middle collar part 31b, and a part of upper collar part 31c by the predetermined space | interval.

  In the above-described first embodiment, the first winding frame portion 34a and the second winding frame portion 34b are integrally provided, and in the above-described second embodiment, the first winding frame portion is provided. A configuration in which the portion 34a, the second winding frame portion 34b, and the third winding frame portion 34c are integrally provided is described. However, the plurality of winding frame portions are not necessarily provided integrally. That is, the multistage coil bobbin does not need to be provided integrally, and the multistage coil bobbin may be configured by combining separate winding frame portions. Examples thereof are shown in FIGS. 14 and 15.

  14 and 15 disclose a two-stage coil bobbin 150 having a configuration in which separate members are combined. The two-stage coil bobbin 150 includes a lower coil bobbin 160 provided integrally with the first terminal block 32 and the second terminal block 33, and an upper coil bobbin 170 attached to the lower coil bobbin 160 so as to be overlapped with the lower coil bobbin 160. , Is composed of. Among these, the lower coil bobbin 160 is provided with a first winding frame portion 34a.

  Further, the upper coil bobbin 170 is provided with a second winding frame portion 34b, and has a skirt portion 171 extending downward from the second winding frame portion 34b. A cup portion 172 is provided inside the skirt portion 171. The cup part 172 is a part into which the above-described lower coil bobbin 160 enters. When the lower coil bobbin 160 enters the cup portion 172 (see FIG. 15), the lower coil bobbin 160 is covered with the skirt portion 171. Accordingly, the skirt portion 171 can perform the same function as the first insulating cover 50 and the second insulating cover 60 described above.

  That is, the first winding frame portion 34 a (secondary winding 91 a) is covered with the skirt portion 171, and the secondary winding 91 b wound around the second winding frame portion 34 b is transmitted through the skirt portion 171. By being arranged toward the binding terminals 40a and 41b, insulation can be achieved between the secondary winding 91a and the secondary winding 91b.

  The skirt portion 171 does not need to be provided over the entire circumference of the upper coil bobbin 170. For example, the skirt portion 171 may be provided with a necessary length by notching appropriately such as providing only a half circumference. Further, the skirt portion 171 may be a separate member with respect to the upper coil bobbin 170.

  The leakage transformer of the present invention can be used, for example, as a backlight discharge lamp for a display device of a notebook personal computer.

It is a disassembled perspective view which shows the structure of the leakage transformer which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the whole leakage transformer of FIG. It is a top view which shows the structure of the leakage transformer of FIG. It is a side view which shows the structure of the leakage transformer of FIG. It is a front view which shows the structure of the leakage transformer of FIG. It is a reverse view which shows the structure of the leakage transformer of FIG. It is a sectional side view which shows the structure of the leakage transformer of FIG. It is a perspective view which shows the state which looked at the structure of the two-stage coil bobbin from the front side among the leakage transformers of FIG. FIG. 2 is a perspective view showing a state in which the configuration of a two-stage coil bobbin is viewed from the side in the leakage transformer of FIG. 1. It is a perspective view which shows the shape of the case core and lid core which form a core among the leakage transformers of FIG. It is a perspective view which shows the structure of the 1st insulating cover among the leakage transformers of FIG. It is a perspective view which shows the structure of the 2nd insulation cover among the leakage transformers of FIG. It is a sectional side view which shows the structure of the leakage transformer which concerns on the 2nd Embodiment of this invention. It is a disassembled perspective view which shows the structure which concerns on the modification of a multistage coil bobbin among the leakage transformers of this invention. It is a perspective view which shows the structure which concerns on the modification of a multistage coil bobbin among the leakage transformers of this invention.

Explanation of symbols

10, 110 ... Leakage transformer 20 ... Case core (part of core)
21 ... Side wall part 22 ... Recessed part 23, 23a, 23b ... 1st column base (column base)
24, 24a, 24b ... second column base (column base)
30, 150 ... Two-stage coil bobbin (multi-stage coil bobbin)
DESCRIPTION OF SYMBOLS 31 ... Winding part 31a ... Upper collar part 31b ... Middle collar part 31c ... Lower collar part 31d ... Upper collar part for primary 32 ... 1st terminal block 33 ... 2nd terminal block 34a ... 1st winding frame part 34b ... 2nd winding frame part 34c ... 3rd winding frame part 36a, 36b ... Middle recess 37 ... Guide groove 38a-38g, 41a, 41d ... Terminal 40, 40a, 40b, 41b, 41c ... Tying terminal 50 ... 1st insulating cover 60 ... 2nd insulating cover 70 ... Coil bobbin for primary 72 ... Winding frame part 80 ... Cover core (a part of core)
90 ... Primary winding 91 ... Secondary winding 130 ... Three-stage coil bobbin (multi-stage coil bobbin)
160 ... lower coil bobbin 170 ... upper coil bobbin 171 ... skirt part 172 ... cup part

Claims (11)

In the leakage transformer in which electromagnetic induction is performed between the primary winding and the secondary winding, and these primary winding and secondary winding are housed in the core,
A state in which there are more than the number of winding frame portions corresponding to the winding of the plurality of secondary windings, and the winding frame portions are arranged in a direction perpendicular to the plane formed by the winding direction of the secondary windings. A multi-stage coil bobbin arranged in
A primary coil bobbin disposed on the outer peripheral side of the multi-stage coil bobbin and having a winding frame portion around which the primary winding is wound;
The secondary winding is wound around each winding frame portion of the multi-stage coil bobbin, and the primary winding is wound around the winding frame portion of the primary coil bobbin. Characteristic leakage transformer. In the leakage transformer in which electromagnetic induction is performed between the primary winding and the secondary winding, and these primary winding and secondary winding are housed in the core,
A state in which there are more than the number of winding frame portions corresponding to the winding of the plurality of secondary windings, and the winding frame portions are arranged in a direction perpendicular to the plane formed by the winding direction of the secondary windings. Multi-stage coil bobbins, arranged in
A leakage transformer, wherein the secondary winding is wound around each of the winding frame portions of the multi-stage coil bobbin. In the leakage transformer in which electromagnetic induction is performed between the primary winding and the secondary winding, and these primary winding and secondary winding are housed in the core,
More than the number of winding frame portions corresponding to the number of turns of the secondary windings, and the winding frame portions are arranged in a direction perpendicular to the plane formed by the winding direction of the secondary windings. A multi-stage coil bobbin arranged in a state,
The primary winding is wound around at least one of the winding frame portions of the multi-stage coil bobbin, and the winding frame portions other than the winding frame portion around which the primary winding is wound include the second winding. The next winding is wound,
This is a leakage transformer. The multi-stage coil bobbin is:
A first winding frame portion positioned at a lowermost portion on the side where the secondary winding is introduced and the secondary winding is introduced;
The secondary winding is wound, and a second winding frame portion positioned above the first winding frame portion;
The leakage transformer according to claim 1, further comprising:   The multi-stage coil bobbin has three winding frame portions, and among the three winding frame portions, a first winding frame portion positioned at a lowermost portion on the side where the secondary winding is introduced, and the first winding frame portion The secondary windings are respectively wound on the second winding frame portion positioned above the first winding frame portion in a state adjacent to the first winding frame portion, and the three winding frames. 4. The leakage transformer according to claim 3, wherein the primary winding is wound around a third winding frame portion that is an uppermost winding frame portion.   The lower collar part that constitutes the first winding frame part is integrally provided with terminals for connecting the start and end of the plurality of secondary windings and the start and end of the primary windings. 6. The leakage transformer according to claim 4, wherein the leakage transformer is provided.   In the lower collar portion that is positioned above the first reel portion or the second reel portion and that constitutes the reel portion around which the secondary winding is wound, The leakage transformer according to any one of claims 4 to 6, further comprising a guide groove for guiding the winding to the bottom surface of the winding frame portion.   The guide groove is provided with an inlet for introducing the secondary winding, and a groove outlet continuous with the bottom surface of the winding frame portion, and as the guide groove extends from the inlet to the groove outlet, 8. The leakage transformer according to claim 7, wherein the bottom surface is directed toward the inner diameter side of the multistage coil bobbin. An insulating cover is attached to the multistage coil bobbin,
The insulating cover guides the secondary winding wound around the winding frame portion positioned at least above the first winding frame portion,
9. The insulation cover according to claim 1, wherein the insulating cover is insulative with respect to a reel portion other than the reel portion around which the secondary winding is wound. Leakage transformer. The insulating cover includes
A first insulating cover provided between a starting end of the secondary winding and the winding frame portion around which the secondary winding is wound;
A second insulating cover provided between the winding frame and the end of the secondary winding;
The leakage transformer according to claim 9, wherein the leakage transformer is provided. The multi-stage coil bobbin is:
A first terminal block that protrudes from one side surface and is entangled with the start of the secondary winding;
A second terminal block protruding from the other side opposite to the one side and the end of the secondary winding being entangled with;
The leakage transformer according to any one of claims 1 to 10, further comprising:

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