JP2005093536A - Core unit, switching power supply, and core retention member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core unit which can accurately realize positioning and fixing of a bus bar and a magnetic substance core with simple configuration, a switching power supply, and a core retention member. <P>SOLUTION: The core unit 2 is constituted of the bus bar 20 of a conductive member, a first core member 31, a second core member 36, the core retention member 40 and a blade spring 25. The core retention member 40 arranged between the bus bar 20 and the core members 31, 36 is constituted of a first retention member 41 and a second retention member 46 which are composed of insulating material. The bus bar 20 penetrates threading portions 42, 47 of an inner peripheral side of the core retention member 40. To retention parts 43, 48 of peripheral side, the core retention member 40 retains core members 31, 36 at predetermined positions respectively which are viewed from the bus bar 20. In the core retention member 40, gap spacers 44, 49 which form a gap between the first core member 31 and the second core member 36 are arranged. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a core unit used in a switching power supply device and the like, a switching power supply device using the same, and a core holding member used to hold a core member in the core unit.

  The core unit integrally fixes a conductive member (bus bar) having a predetermined shape such as a plate shape and a core member constituting the magnetic core in a state where the bus bar is inserted into the inner peripheral side portion of the magnetic core. To do. Examples of conventional core units include those described in Patent Document 1 and Patent Document 2.

In Patent Document 1, a configuration in which a pair of core members of an I-type core and an E-type core is provided for two through conductors and the through conductor is sandwiched between the core members via an insulating sheet, a spacer, or the like is used. . Patent Document 2 describes that a pair of core members having a hollow portion through which a bus bar is inserted are fixed by a leaf spring.
JP-A-9-134824 JP 2002-280764 A

  In the core unit, after positioning between the bus bar and the magnetic core and between the core members constituting the magnetic core, it is necessary to fix them together. However, the conventional core unit has a problem that it is difficult to accurately achieve the positioning and fixing described above with a simple configuration.

  For example, the choke coil described in Patent Document 1 uses a configuration in which a through conductor, a core member, an insulating sheet, a spacer, or the like is pressed with a screw through a press fitting, but in such a configuration, an insulating sheet, Many members such as spacers, presser fittings, and screws are required, and the fixing method is complicated. It is also difficult to position each member sufficiently. In addition, in the ferrite core fixing device described in Patent Document 2, since positioning is performed by a leaf spring that fixes the core member, for example, it is difficult to have a configuration in which a gap is provided between a pair of core members. There may be cases where the configuration is not necessarily sufficient.

  The present invention has been made to solve the above problems, and a core unit, a switching power supply device, and a core capable of accurately realizing positioning and fixing of a bus bar and a magnetic core with a simple configuration. It is an object to provide a holding member.

  In order to achieve such an object, a core unit according to the present invention includes: (1) a bus bar made of a conductive material; and (2) a pair of bus units that are installed to surround the bus bar at a predetermined position in the longitudinal direction with respect to the bus bar. A first core member and a second core member, and (3) a bus bar and a pair of core members. The bus bar is inserted into the inner peripheral side of the first core member and the second core member. A core holding member made of an insulating material that holds each of the two core members in a predetermined position when viewed from the bus bar. And it positions and hold | maintains so that it may become predetermined spacing between the site | parts which 2nd core member opposes, It is characterized by the above-mentioned.

  The core holding member according to the present invention is a core holding member used to hold a pair of core members installed so as to surround the bus bar at a predetermined position in the longitudinal direction of the bus bar made of a conductive material. A bus bar insertion portion that is formed of an insulating material and provided on the inner peripheral side and is inserted and fixed through the bus bar; and provided on the outer peripheral side at a predetermined distance from the bus bar insertion portion. And a core holding part that is held at a predetermined position when viewed from the bus bar.

  In the core unit and the core holding member described above, a core holding member that inserts the bus bar is provided for a bus bar that is a conductive member used in a switching power supply device and the like, and a magnetic core is configured using the core holding member. A pair of core members are held. Thereby, a bus-bar and a magnetic body core can be positioned and fixed correctly.

  The core holding member also has functions such as an insulating member and a positioning member between the bus bar and the magnetic core. Therefore, the structure of the core unit can be simplified by using such a holding member. As the insulating material of the core holding member, for example, a resin material can be used. In addition, although the space | interval between the site | parts where a 1st core member and a 2nd core member oppose is set to a gap space | interval required when providing a gap between a pair of core members, this space | interval is 0. May be.

  Here, the core holding member is preferably constituted by a pair of holding members installed so as to surround the bus bar. Thereby, the core holding member can be easily attached to the bus bar.

  In this case, the pair of holding members is particularly preferably made of the same member. Thereby, the kind of member required in order to comprise a core unit can be reduced. Moreover, it is preferable that each of a pair of holding member has a positioning part for positioning and connecting the other holding member. As a result, the holding members constituting the core holding member can be easily positioned and fixed.

  Moreover, it is preferable that a core unit has a positioning part in which a core holding member positions a 1st core member and a 2nd core member about the longitudinal direction of a bus bar. Similarly, the core holding member preferably has a positioning portion that positions the pair of core members in the insertion direction of the bus bar into the bus bar insertion portion. Thereby, a core member can be easily positioned with respect to a bus-bar and a core holding member.

  In addition, the core holding member protrudes between the opposed portions of the first core member and the second core member, which are a pair of core members, and forms a gap between the first core member and the second core member. It is preferable to provide. Thereby, when providing a gap between a pair of core members, it becomes possible to set the gap interval easily and accurately.

  Moreover, it is preferable that a bus bar has a positioning part which positions a core holding member about the longitudinal direction of a bus bar. Thereby, a core holding member and a core member can be positioned and arranged to a bus bar to a longitudinal direction.

  Moreover, it is good also as providing the fixing member which fixes a pair of core member and a core holding member integrally with respect to a bus bar.

  The switching power supply device according to the present invention includes (a) a switching circuit that switches an input voltage, converts the input voltage into a predetermined voltage and outputs the voltage, and (b) outputs the output voltage of the voltage converter. A rectifying / smoothing circuit unit that performs rectification and smoothing, and (c) an output filter unit that removes noise of the output voltage of the rectifying / smoothing circuit unit, and (d) the output filter unit has the above-described core unit. It is characterized by. Thus, a switching power supply device including a core unit in which the bus bar and the magnetic core are accurately positioned and fixed with a simple configuration is realized.

  According to the core unit, the switching power supply device, and the core holding member according to the present invention, the core holding member that inserts the bus bar is provided, and the core holding member is used to hold the pair of core members that constitute the magnetic core. In addition, the positioning and fixing of the bus bar and the magnetic core can be accurately realized with a simple configuration.

  Hereinafter, preferred embodiments of a core unit, a switching power supply device, and a core holding member according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, the dimensional ratios in the drawings do not necessarily match those described.

  First, the configuration of the switching power supply device will be described.

  FIG. 1 is a block diagram schematically showing the configuration of a switching power supply device according to the present invention. The switching power supply device 1 steps down (converts) and outputs a DC voltage supplied from a generator, a battery, or the like to a predetermined voltage, and includes an input filter unit 11, a voltage conversion unit 12, and a rectifying and smoothing circuit. Part 15 and an output filter part 16.

  The input filter unit 11 removes noise included in the DC voltage input to the power supply device 1 from the generator, battery, or the like via the input terminal 10 and sends the noise to the voltage conversion unit 12 that steps down the input voltage. The voltage conversion unit 12 includes a switching circuit 13 and a main transformer 14. The switching circuit 13 converts the DC voltage from the input filter unit 11 into an AC voltage by switching. The main transformer 14 receives the AC voltage from the switching circuit 13 and converts the voltage into a predetermined value (step-down conversion). Note that the input filter unit 11 has a function of blocking emission of noise generated by the switching circuit 13 and the like in addition to the above-described function of blocking noise from the outside.

  The output voltage converted by the voltage conversion unit 12 is input to the rectifying and smoothing circuit unit 15. The rectifying / smoothing circuit unit 15 includes a rectifying circuit that rectifies and outputs the alternating current output from the main transformer 14 and a smoothing circuit that smoothes the voltage output from the rectifying circuit. The output voltage that has been rectified and smoothed by the rectifying and smoothing circuit unit 15 is output as a DC voltage that has undergone voltage conversion from the output terminal 18 after noise is removed by the output filter unit 16. Further, in the switching power supply device 1, the output filter unit 16 is provided with a core unit 2 described later. The core unit 2 functions as a noise filter, and is used for removing noise in a predetermined frequency band such as a radio frequency band.

  FIG. 2 is a top view illustrating a specific configuration example of the switching power supply device illustrated in FIG. 1. In the switching power supply device 1, the input filter unit 11, the voltage conversion unit 12, the rectifying / smoothing circuit unit 15, and the output filter unit 16 are all mounted on the base plate 19.

  The voltage converter 12 is provided with a transistor unit 13 a composed of an FET or the like that is a switching circuit 13, and a main transformer 14. The rectifying / smoothing circuit unit 15 is provided with a diode 15a constituting a rectifying circuit, a choke coil 15b constituting a smoothing circuit, and a capacitor 15c. Further, as described above, the core unit 2 is installed in the output filter unit 16 as a noise filter.

  Next, a core unit and a core holding member used in the switching power supply device will be described.

  FIG. 3 is a perspective view showing the configuration of the first embodiment of the core unit according to the present invention. FIG. 4 is an exploded perspective view showing the configuration of the core unit shown in FIG. Here, in the description of the core unit below, as shown in FIGS. 3 and 4, the longitudinal direction of the bus bar is the x-axis direction (front-rear direction), the width direction is the y-axis direction (left-right direction), and the thickness direction is The z-axis direction (vertical direction) is assumed. However, these axes and directions are used for convenience of explanation, and are irrelevant to the front-rear direction and the like when mounted on the switching power supply device.

  The core unit 2 includes a bus bar 20, a pair of core members 30 including a first core member 31 and a second core member 36, a core holding member 40, and a leaf spring 25. The bus bar 20 is a conductive member made of a conductive material (for example, a metal material such as copper) and having a plate shape, and is used as a current path in the switching power supply device 1 shown in FIG. The size of the bus bar 20 is set in accordance with the magnitude of the flowing current, etc., and is, for example, 2 mm thick and 8-12 mm wide. Further, in the bus bar 20, the x-axis direction, which is the longitudinal direction thereof, is the direction in which current flows.

  A first core member 31 and a second core member 36 are installed at predetermined positions in the longitudinal direction (x-axis direction) of the bus bar 20 with respect to the bus bar 20. These core members 31 and 36 are disposed along a yz plane orthogonal to the x-axis direction.

  The first core member 31 is made of a U-shaped magnetic body (for example, ferrite) that sandwiches the bus bar 20 from the right side. The second core member 36 is a U-shape that sandwiches the bus bar 20 from the left side, and is made of a magnetic body having the same shape as the first core member 31. By combining these core members 31 and 36, a magnetic core surrounding the bus bar 20 is configured. This magnetic core functions as a noise filter for the current flowing through the bus bar 20.

  A core holding member 40 is provided between the bus bar 20 and the core members 31 and 36. The core holding member 40 is made of an insulating material, and the bus bar 20 is inserted into the inner peripheral side thereof, and the core members 31 and 36 are held at predetermined positions on the outer peripheral side when viewed from the bus bar 20. In the present embodiment, the core holding member 40 is constituted by a pair of holding members 41 and 46 installed so as to surround the bus bar 20.

  5A and 5B are views showing the first holding member constituting the core holding member. FIG. 5A is a side view seen from the left side in FIGS. 3 and 4, and FIG. 5B is seen from the front side. The front view and FIG. 5C are bottom views as seen from below.

  The first holding member 41 has a U-shape including an upper portion 41a located on the upper right side of the bus bar 20, a lower portion 41b located on the lower right side, and a side portion 41c on the right side that connects the upper portion 41a and the lower portion 41b. have. On the inner peripheral side of the first holding member 41, there is provided a first insertion portion 42 in which the right side portion of the bus bar 20 is inserted and fixed, and the left side is opened. On the outer peripheral side of the first holding member 41, a first holding portion 43 that is separated from the first insertion portion 42 by a predetermined distance d1 (corresponding to the thickness of the upper portion 41a, the lower portion 41b, and the side portion 41c) is provided. . The first holding member 43 holds the first core member 31 at a position away from the bus bar 20 by a distance d1. At this time, the bus bar 20 and the first core member 31 are electrically insulated by the first holding member 41.

  Positioning rail portions 43 a are provided along the U-shape at the front edge and the rear edge of the first holding portion 43 of the first holding member 41. The interval between the rail portions 43 a is set so as to substantially match the width of the first core member 31 in the x-axis direction. Therefore, by inserting the first core member 31 between the rail portions 43 a of the first holding portion 43, the first core member 31 moves in the x-axis direction (the longitudinal direction of the bus bar 20, the bus bar 20 to the first insertion portion 42. Positioning in the insertion direction).

  Further, in the first holding member 41, a gap spacer portion 44 having a thickness d2 protruding downward is provided on the left side of the lower portion 41b. Accordingly, as shown in FIG. 5B, the lower portion 41b is elongated to the left side by the thickness d2 of the spacer portion 44 when viewed from the upper portion 41a. Further, a fitting concave portion 41d and a fitting convex portion 41e are provided on the left side surfaces of the upper portion 41a and the lower portion 41b, respectively. These concave portions 41 d and convex portions 41 e are positioning portions for positioning and connecting the other holding member 46.

  The second holding member 46 has a U-shape including an upper part 46a located on the upper left side of the bus bar 20, a lower part 46b located on the lower left side, and a side part 46c on the left side connecting the upper part 46a and the lower part 46b. Have. On the inner peripheral side of the second holding member 46, there is provided a second insertion portion 47 in which the left side portion of the bus bar 20 is inserted and fixed, and the right side is opened. On the outer peripheral side of the second holding member 46, a second holding portion 48 that is separated from the second insertion portion 47 by a predetermined distance d1 (corresponding to the thickness of the upper portion 46a, the lower portion 46b, and the side portion 46c) is provided. . The second holding member 48 holds the second core member 36 at a position separated from the bus bar 20 by a distance d1. At this time, the bus bar 20 and the second core member 36 are electrically insulated by the second holding member 46.

  Positioning rail portions 48 a are provided along the U-shape at the front edge and the rear edge of the second holding portion 48 of the second holding member 46. The interval between the rail portions 48 a is set so as to substantially match the width of the second core member 36 in the x-axis direction. Therefore, by inserting the second core member 36 between the rail portions 48 a of the second holding portion 48, the second core member 36 moves in the x-axis direction (the longitudinal direction of the bus bar 20, the bus bar 20 to the second insertion portion 47. Positioning in the insertion direction).

  Further, in the second holding member 46, a gap spacer portion 49 having a thickness d2 protruding upward is provided on the right side of the upper portion 46a. As a result, the upper part 46a is elongated to the right by the thickness d2 of the spacer part 49 when viewed from the lower part 46b. Further, a fitting convex portion 46d and a fitting concave portion 46e are provided on the left surfaces of the upper portion 46a and the lower portion 46b, respectively. These convex portions 46d and concave portions 46e are positioning portions for positioning and connecting the other holding member 41.

  Here, these holding members 41 and 46 are the same member, and are arranged in a state where they are rotated 180 degrees from each other about the x axis. Then, as shown in FIG. 6, the left surface of the upper portion 41a of the first holding member 41 and the right surface of the upper portion 46a of the second holding member 46 are connected and the fitting concave portion 41d and the fitting convex portion 46d are fitted. Integrating the bus bar 20 by connecting the left surface of the lower portion 41b of the first holding member 41 and the right surface of the lower portion 46b of the second holding member 46 and fitting the fitting convex portion 41e and the fitting concave portion 46e together. The core holding member 40 is configured.

  At this time, the first insertion portion 42 and the second insertion portion 47 constitute a bus bar insertion portion to which the bus bar 20 is inserted and fixed. The first holding portion 43 and the second holding portion 48 constitute a core holding portion that holds the core members 31 and 36 at predetermined positions.

  Further, the gap spacer portion 49 provided on the upper side of the core holding member 40 protrudes between the upper left end of the first core member 31, which is a portion facing each other, and the upper right end of the second core member 36. ing. In addition, the gap spacer portion 44 provided on the lower side of the core holding member 40 is between the lower left end of the first core member 31 and the lower right end of the second core member 36, which are portions facing each other. It protrudes. By the gap spacer portions 49 and 44, a gap having a gap interval d <b> 2 corresponding to the thickness of the gap spacer portions 49 and 44 is formed between the first core member 31 and the second core member 36. The size and the like of the holding members 41 and 46 are set according to the size and shape of the bus bar 20 and the core members 31 and 36. For example, the interval between the bus bar 20 and the core members 31 and 36 is d1 = 2 mm, the core The gap interval between the members 31 and 36 is d2 = 0.5 mm.

  For these core members 31, 36 and core holding member 40, two positioning convex portions 21 projecting leftward are provided on the left surface of the bus bar 20. The interval between the convex portions 21 is set so as to substantially match the width of the second holding member 46 in the x-axis direction. Therefore, by inserting the second holding member 46 between the positioning convex portions 21, the second holding member 46 is positioned in the x-axis direction. Further, the first holding member 41 is positioned with respect to the second holding member 46, and the core members 31 and 36 are positioned with respect to the holding members 41 and 46. Therefore, with the above configuration, the core members 31 and 36 and the holding members 41 and 46 are positioned and arranged with respect to the bus bar 20.

  Further, a leaf spring 25 that is a fixing member that fixes the core members 31 and 36 and the core holding member 40 integrally with the bus bar 20 is provided. The leaf spring 25 includes an upper portion 25a and side portions 25b and 25c. The core members 31 and 36 and the core holding member 40 which are positioned and held with respect to the bus bar 20 are sandwiched from above to fix them together.

  The effects of the core unit, the switching power supply device, and the core holding member according to the above-described embodiment will be described.

  In the core unit 2 and the core holding member 40 shown in FIGS. 3 to 5, a core holding member 40 having a bus bar insertion portion is provided to the bus bar 20 which is a conductive member used in a switching power supply device or the like. The holding member 40 is used to hold the pair of core members 31 and 36 that constitute the magnetic core. Thereby, the bus bar 20 used as a current path and the core members 31 and 36 of the magnetic core used for noise removal can be accurately positioned and fixed.

  The core holding member 40 is made of an insulating material, and only this member functions as an insulating member, a positioning member, and the like between the bus bar 20 and the core members 31 and 36. Therefore, by using such a holding member 40, the number of members required for the core unit 2 can be reduced to simplify the configuration, and the cost can be reduced. Further, according to the switching power supply device 1 shown in FIGS. 1 and 2 in which such a core unit 2 is applied as a noise filter in the output filter unit 16, the core members 31 and 36 of the bus bar 20 and the magnetic core are simple. A switching power supply device 1 including a core unit 2 that is accurately positioned and fixed with a simple configuration is realized. Moreover, the assembly process of the core unit 2 and the switching power supply device 1 can be simplified by the simplification of the configuration described above.

  Such a switching power supply device 1 stabilizes an input voltage sent from an in-vehicle high-voltage battery of about 200 to 300 V to a voltage of about 12 to 14 V in a normal low-voltage battery and stabilizes in a hybrid vehicle, for example. Thus, it can be suitably used as a DC-DC converter that sends power to in-vehicle devices such as power windows, headlights, audio devices, and motors.

  Here, in the present embodiment, the core holding member 40 is configured by a pair of holding members 41 and 46 installed so as to surround the bus bar 20. Thereby, the core holding member 40 can be easily attached to the bus bar 20. In this case, the holding members 41 and 46 are preferably made of the same (same shape, same material) members as described above. Thereby, the kind of member required for the core unit 2 can be reduced.

  Further, by providing fitting concave portions 41d and 46e and fitting convex portions 41e and 46d as positioning portions for positioning and connecting the holding members 41 and 46, positioning and fixing of the holding members 41 and 46 can be performed. Can be easily performed. As such a positioning portion, various configurations other than the concave portion and the convex portion can be used. Moreover, it is good also as a structure which does not provide a positioning part if unnecessary.

  In addition, as an insulating material of the core holding member 40, it is preferable to use resin materials, such as engineering plastics, for example. Alternatively, other insulating materials such as a ceramic material may be used.

  In the core unit 2 described above, the core holding member 40 is provided with positioning rail portions 43a and 48a for positioning the core members 31 and 36 in the longitudinal direction of the bus bar 20 (the insertion direction to the bus bar insertion portion). Thereby, the core members 31 and 36 can be easily positioned with respect to the bus bar 20 and the core holding member 40. As such a positioning part, you may use structures other than a rail part. Alternatively, in the case where positioning is possible by a leaf spring or the like used as a fixing member, the core holding member 40 may be configured without a positioning portion.

  In the bus bar 20, a positioning convex portion 21 that positions the core holding member 40 in the longitudinal direction of the bus bar 20 is provided. Thereby, the core holding member 40 and the core members 31 and 36 can be positioned in the longitudinal direction with respect to the bus bar 20. However, in the case of positioning at the time of attachment to the switching power supply device 1, the bus bar 20 may not be provided with a positioning portion.

  In the present embodiment, the gap holding portions 40 and 49 that protrude between the facing portions of the core members 31 and 36 are provided in the core holding member 40. As a result, a necessary gap can be formed between the first core member 31 and the second core member 36, and the gap interval d2 can be set easily and accurately. Further, since the core holding member 40 also has the function of a gap spacer, the number of members required for the core unit 2 can be reduced to simplify the configuration, and the cost can be reduced. The gap between the core members is provided for adjusting the inductance L of the core unit, and is appropriately set in consideration of the core material, cross-sectional area, characteristics required as a noise filter, and the like.

  FIG. 7 is an exploded perspective view showing the configuration of the second embodiment of the core unit. The core unit 2 </ b> A according to the present embodiment includes a bus bar 20, a pair of core members 30 including a first core member 31 and a second core member 36, and a core holding member 40 including a first holding member 41 and a second holding member 46. And a leaf spring 25. Among these, the configurations of the core members 31 and 36, the core holding member 40, and the leaf spring 25 are the same as those shown in FIG.

  In the present embodiment, the positioning recess 22 is provided on the left surface of the bus bar 20 with respect to the core members 31 and 36 and the core holding member 40. The width of the positioning recess 22 is set so as to substantially match the width of the second holding member 46. Therefore, by fitting the second holding member 46 into the positioning recess 22, the second holding member 46, the first holding member 41, and the core members 31 and 36 are positioned and arranged with respect to the bus bar 20.

  Also in the core unit 2A and the core holding member 40 shown in FIG. 7, by holding the pair of core members 31 and 36 constituting the magnetic core using the core holding member 40, the bus bar 20, the core member 31, 36 can be accurately positioned and fixed with a simple configuration. In the bus bar 20, a positioning recess 22 that positions the core holding member 40 in the longitudinal direction of the bus bar 20 is provided. Also with such positioning recess 22, the core holding member 40 and the core members 31 and 36 can be positioned in the longitudinal direction with respect to the bus bar 20, similarly to the positioning protrusion 21 in FIG. 4. In addition to this, various configurations can be used as the positioning portion provided in the bus bar 20.

  FIG. 8 is an exploded perspective view showing the configuration of the third embodiment of the core unit. The core unit 2 </ b> B according to the present embodiment includes a bus bar 20, a pair of core members 30 including a first core member 31 and a second core member 36, and a core holding member 40 including a first holding member 41 and a second holding member 46. And a leaf spring 25. Among these, the configurations of the bus bar 20, the core members 31, 36, and the leaf spring 25 are the same as those shown in FIG.

  In the present embodiment, the first holding member 41 is not provided with a gap spacer portion (see the gap spacer portion 44 shown in FIG. 4). On the other hand, in the 2nd holding member 46, the gap spacer part 49a which protrudes upwards is provided in the right side of the upper part 46a. Further, a gap spacer portion 49b protruding downward is provided on the right side of the lower portion 46b.

  Further, in the core holding member 40 configured by the first holding member 41 and the second holding member 46, the gap spacer portion 49 a includes the upper left end of the first core member 31 and the upper right end of the second core member 36. Protruding between. The gap spacer portion 49 b protrudes between the lower left end of the first core member 31 and the lower right end of the second core member 36. A gap having a gap interval corresponding to the thickness of the gap spacer portions 49a and 49b is formed between the first core member 31 and the second core member 36 by the gap spacer portions 49a and 49b.

  Also in the core unit 2 </ b> B and the core holding member 40 shown in FIG. 8, by holding the pair of core members 31 and 36 that constitute the magnetic core using the core holding member 40, the bus bar 20, the core member 31, 36 can be accurately positioned and fixed with a simple configuration. Two gap spacer portions 49 a and 49 b are provided together on one holding member 46. Such gap spacer portions 49a and 49b also form a necessary gap between the core members 31 and 36 as well as the gap spacer portions 44 and 49 in FIG. It becomes possible to set. In addition to this, various configurations can be used as the gap spacer portion provided in the core holding member 40.

  In the present embodiment, due to the configuration of the gap spacer portion described above, the pair of holding members 41 and 46 constituting the core holding member 40 are members having different shapes. The core holding member 40 may be composed of a plurality of types of members as described above.

  FIG. 9 is an exploded perspective view showing the configuration of the fourth embodiment of the core unit. The core unit 2 </ b> C according to the present embodiment includes a bus bar 20, a pair of core members 30 including a first core member 31 and a second core member 36, a core holding member 50, and a leaf spring 25. Among these, the configurations of the bus bar 20, the core members 31, 36, and the leaf spring 25 are the same as those shown in FIG.

  In the present embodiment, the core holding member 50 is composed of a single holding member 51. The holding member 51 has a U-shape including an upper portion 51a positioned on the upper side of the entire bus bar 20, a lower portion 51b positioned on the lower side, and a side portion 51c on the left side connecting the upper portion 51a and the lower portion 51b. doing. On the inner peripheral side of the holding member 51, there is provided a bus bar insertion portion 52 in which the entire bus bar 20 is inserted and fixed, and the right side thereof is opened. On the outer peripheral side of the holding member 51, a core holding portion 53 that is separated from the insertion portion 52 by a predetermined distance (corresponding to the thickness of the upper portion 51a, the lower portion 51b, and the side portion 51c) is provided. The holding portion 53 holds the first core member 31 and the second core member 36 at positions separated from the bus bar 20 by a predetermined distance. At this time, the bus bar 20, the first core member 31, and the second core member 36 are electrically insulated by the holding member 51.

  Positioning rail portions 53a are provided along the U-shape at the front edge portion and the rear edge portion of the core holding portion 53 of the holding member 51. The interval between the rail portions 53 a is set so as to substantially match the width of the core members 31 and 36. Therefore, by inserting the core members 31 and 36 between the rail portions 53 a of the core holding portion 53, the core members 31 and 36 are positioned with respect to the core holding member 50 and the bus bar 20.

  Further, in the holding member 51, a gap spacer portion 54 protruding upward is provided at the center position of the upper portion 51a. In addition, a gap spacer portion 55 that protrudes downward is provided at the center position of the lower portion 51b.

  In the core holding member 50 constituted by the holding member 51, the gap spacer portion 54 protrudes between the upper left end of the first core member 31 and the upper right end of the second core member 36. Further, the gap spacer portion 55 projects between the lower left end of the first core member 31 and the lower right end of the second core member 36. By the gap spacer portions 54 and 55, a gap having a gap distance corresponding to the thickness of the gap spacer portions 54 and 55 is formed between the first core member 31 and the second core member 36.

  Also in the core unit 2 </ b> C and the core holding member 50 shown in FIG. 9, by holding the pair of core members 31 and 36 that constitute the magnetic core using the core holding member 50, the bus bar 20, the core member 31, 36 can be accurately positioned and fixed with a simple configuration. Further, the core holding member 50 is constituted by a single holding member 51. Also with such a holding member 51, the core members 31 and 36 can be suitably held in the same manner as the holding members 41 and 46 in FIG. When the core holding member is constituted by a single holding member, an O-shaped holding member having a through-hole-shaped bus bar insertion portion may be used.

  The core unit, the switching power supply device, and the core holding member according to the present invention are not limited to the above-described embodiments, and various modifications can be made. For example, the bus bar 20 which is a conductive member has a plate shape in the above-described embodiment, but may have another shape such as a columnar shape, and other than the position where the core unit is provided. It may be bent at the position. In addition, as the fixing member that fixes the core member and the core holding member integrally to the bus bar, the plate spring 25 is used in the above-described embodiment, but other fixing members may be used and may be unnecessary. For example, a configuration without a fixing member may be employed. Moreover, about the core members 31 and 36, although two U-shaped cores were used in the above-mentioned embodiment, they may have mutually different shapes, such as using a U-shaped core and an I-shaped core.

  Moreover, about the gap provided between the site | parts where two core members oppose, it is set as the structure which provides a gap spacer part in a core holding member in above-described embodiment. However, in general, the core holding member only needs to position and hold the core member so that a predetermined interval is provided between the opposing portions of the two core members. If this interval is 0, that is, a gap is provided. If not, the gap spacer portion need not be provided. Further, even when a gap is provided, the gap spacer portion is not provided so that a gap is formed at a predetermined interval between the opposing portions of the two core members when the core member is positioned by the core holding portion. It is also possible to do. However, when providing a gap, it is preferable to provide a gap spacer part from the viewpoint of the reliability of gap formation and the accuracy of the gap interval.

  In addition, the core unit and the core holding member according to the present invention can be applied as a noise filter or the like to devices other than the switching power supply device.

  The core unit, the switching power supply device, and the core holding member according to the present invention can be used as a core unit that can accurately achieve positioning and fixing of the bus bar and the magnetic core with a simple configuration.

It is a block diagram which shows the structure of a switching power supply device roughly. It is a top view which shows the specific structural example of the switching power supply device shown in FIG. It is a perspective view which shows the structure of 1st Embodiment of a core unit. It is a perspective view which expands and shows the structure of the core unit shown in FIG. It is the (a) side view, (b) front view, and (c) bottom view which show the 1st holding member which constitutes the core holding member. It is a front view which shows the core holding member which combined the 1st holding member and the 2nd holding member. It is a perspective view which expands and shows composition of a 2nd embodiment of a core unit. It is a perspective view which expands and shows the composition of a 3rd embodiment of a core unit. It is a perspective view which expands and shows composition of a 4th embodiment of a core unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Switching power supply device, 10 ... Input terminal, 11 ... Input filter part, 12 ... Voltage conversion part, 13 ... Switching circuit, 13a ... Transistor unit, 14 ... Main transformer, 15 ... Rectification smoothing circuit part, 15a ... Diode, 15b ... choke coil, 15c ... capacitor, 16 ... output filter, 18 ... output terminal, 19 ... base plate,
DESCRIPTION OF SYMBOLS 2 ... Core unit, 20 ... Bus bar, 21 ... Positioning convex part, 22 ... Positioning recessed part, 25 ... Leaf spring, 25a ... Upper part, 25b, 25c ... Side part, 30 ... A pair of core member, 31 ... 1st core member, 36 ... 2nd core member, 40 ... Core holding member, 41 ... 1st holding member, 41a ... Upper part, 41b ... Lower part, 41c ... Side part, 41d ... Fitting recessed part, 41e ... Fitting convex part, 42 ... 1st Insertion part 43 ... 1st holding part 43a ... Positioning rail part 44 ... Gap spacer part 46 ... 2nd holding member 46a ... Upper part, 46b ... Lower part, 46c ... Side part, 46d ... Fitting convex part, 46e ... Fitting recess, 47 ... second insertion part, 48 ... second holding part, 48a ... positioning rail part, 49 ... gap spacer part, 49a, 49b ... gap spacer part, 50 ... core holding member, 51 ... holding member, 51a ... upper part, 5 b ... lower, 51c ... side, 52 ... bus bar insertion portion, 53 ... core holding portion, 53a ... positioning rail section, 54, 55 ... gap spacer portion.

Claims (16)

A bus bar made of a conductive material;
A first core member and a second core member which are a pair of core members installed so as to surround the bus bar at a predetermined position in the longitudinal direction with respect to the bus bar;
The bus bar is provided between the bus bar and the pair of core members, the bus bar is inserted into the inner peripheral side thereof, and the first core member and the second core member are respectively held at predetermined positions when viewed from the bus bar on the outer peripheral side. A core holding member made of an insulating material,
The core holding member positions and holds the pair of core members at a predetermined distance from the bus bar and at a predetermined distance between the opposed portions of the first core member and the second core member. A core unit characterized by that.   The core unit according to claim 1, wherein the core holding member includes a pair of holding members installed so as to surround the bus bar.   The core unit according to claim 2, wherein the pair of holding members are made of the same member.   4. The core unit according to claim 2, wherein each of the pair of holding members has a positioning portion for positioning and connecting the other holding member. 5.   The core unit according to any one of claims 1 to 4, wherein the core holding member includes a positioning portion that positions the first core member and the second core member in a longitudinal direction of the bus bar.   The core holding member has a gap spacer portion that protrudes between opposing portions of the first core member and the second core member and forms a gap between the first core member and the second core member. The core unit according to claim 1, wherein:   The said bus bar has a positioning part which positions the said core holding member about the longitudinal direction of the said bus bar, The core unit as described in any one of Claims 1-6 characterized by the above-mentioned.   The core unit according to claim 1, further comprising a fixing member that integrally fixes the pair of core members and the core holding member to the bus bar.   The core unit according to claim 1, wherein the core holding member is made of a resin material. A voltage converter that has a switching circuit for switching an input voltage, converts the input voltage into a predetermined voltage, and outputs the voltage;
A rectifying / smoothing circuit that rectifies and smoothes the output voltage of the voltage converter;
An output filter unit for removing noise of the output voltage of the rectifying and smoothing circuit unit,
The said output filter part has a core unit as described in any one of Claims 1-9, The switching power supply device characterized by the above-mentioned. A core holding member used to hold a pair of core members installed so as to surround the bus bar at a predetermined position in the longitudinal direction of the bus bar made of a conductive material,
Formed from insulating material,
A bus bar insertion portion that is provided on an inner peripheral side and is fixed by inserting the bus bar;
A core holding member, comprising: a core holding portion provided on the outer peripheral side at a predetermined distance from the bus bar insertion portion, wherein the pair of core members are held at predetermined positions when viewed from the bus bar.   The core holding member according to claim 11, comprising a pair of holding members installed so as to surround the bus bar.   The core holding member according to claim 12, wherein the pair of holding members are made of the same member.   14. The core holding member according to claim 12, wherein each of the pair of holding members has a positioning portion for positioning and connecting the other holding member.   The core holding member according to claim 11, further comprising a positioning portion that positions the pair of core members with respect to a direction in which the bus bar is inserted into the bus bar insertion portion.   Providing a gap spacer portion that projects between opposing portions of the first core member and the second core member that are the pair of core members, and that forms a gap between the first core member and the second core member. The core holding member according to any one of claims 11 to 15, characterized in that

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