JP2009206421A - Choke coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a choke coil which includes a terminal portion for electric connection constituted at a fixed position, achieve accurate positioning during component mounting, and stably obtain solder connection corresponding to a large current, and is suitably applied to automated mounting. <P>SOLUTION: A coil 3 is constituted by winding a wire rod 2 around an outer periphery of a rod-shaped ferrite core 1 as predetermined, and the wire rod 2 is increased in wire diameter to increase current capacity for use of a large current. The coil 3 includes lead ends 31 led out at both ends along the length of the ferrite core 1, and electrode pieces 4 and 4 are disposed at both the ends and assembled to a support 5 in an arrangement along the length of the ferrite core 1 to be supported. The electrode pieces 4 are formed by bending metal plate materials, and the lead ends 31 of the coil 3 are fitted in cut portions 41 and electrically connected by soldering etc. Each electrode piece 4 includes at least two plane parts formed as terminal parts 42 to be brought into surface contact with a pattern part of a printed circuit board. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a choke coil that increases current capacity by making the wire of the coil thicker or the like, and more specifically corresponds to a large current application. It relates to improvement of electrical connectivity.

  As one form of the choke coil, there is a coil obtained by winding a wire rod around a rod-shaped ferrite core in a predetermined manner. As is well known, the choke coil is used for a smoothing circuit or the like for smoothing a current containing a high frequency component.

In addition, since the DC-DC converter or the like is not only reduced in size but also increased in output, it is necessary to cope with a large current in order to apply to such applications. Therefore, for example, as can be seen in Patent Document 1, there are proposals such as using a large number of rectangular wires as the coil wire. In any case, however, to obtain a large current capacity, the wire material needs a certain cross-sectional area. To increase the current capacity by increasing the diameter of the coil wire material, etc. no change.
JP 2007-88340 A

  However, the conventional choke coil has the following problems. In order to adopt a configuration in which the terminal portion for electrical connection is a tip portion in which the lead end of the coil is simply protruded or a tip portion in which the lead end of the coil is simply bent is formed, as in Patent Document 1 described above. The position in the part is not a fixed position, and the variation is large. For this reason, when mounting on a printed circuit board, there exists a problem which raise | generates position shift and rattling (separation) with respect to a pattern part, and the position accuracy as a connection site | part is hard to come out, and causes the problem that soldering is not stabilized. Further, the above-described conventional choke coil cannot be sucked and held by a suction device in automated mounting, and has poor handling properties.

  The object of the present invention is to solve the above-mentioned problems. The purpose of the present invention is to be able to configure a predetermined terminal portion for electrical connection, to accurately position the component in mounting, and to stabilize the solder connection corresponding to a large current. It is an object of the present invention to provide a choke coil that can be preferably applied to automated mounting.

  In order to achieve the above-described object, the choke coil according to the present invention has (1) a rod-shaped ferrite core, and a wire is wound around the periphery of the ferrite core to form a coil. An electrode piece formed by bending a metal plate material into a predetermined shape, and a support body that is formed of an insulating material such as a resin material and supports at least two electrode pieces. A piece is provided with a notch or hole for fitting the lead end of the coil to make electrical connection, and at least two plane parts are formed by a predetermined bending process to contact the pattern part of the printed circuit board To make a part. In order to deal with the use of a large current, it can be realized by increasing the current capacity by, for example, increasing the diameter.

  (2) The terminal portion has a configuration in which at least two (plural) rising edge portions that are raised by bending are provided on the edge portion surrounding the flat portion, or (3) the support is made of a magnetic material such as ferrite. It can be configured to form.

  (4) The coil has lead ends drawn along both ends of the ferrite core, the electrode pieces are positioned at both ends of the ferrite core, and the support is disposed along the length of the ferrite core. A terminal part is located in the other side, and it can be set as the structure set as the horizontal mounting attitude | position along which the longitudinal axis of a ferrite core is along with respect to a printed circuit board.

  (5) The electrode piece is formed into a frame shape with one side being the open side by bending both ends of the strip plate material into a substantially L shape, and the support is It is preferable that the ferrite core is positioned in two frames arranged by electrode pieces, and the ferrite core is arranged in a lateral orientation along the length of the printed circuit board.

  (6) The electrode piece is formed by bending the strip plate material into a crank shape in multiple stages to form a plurality of terminal portions, and arranging the two electrode pieces in parallel so that the support is supported between the two. It is preferable that the ferrite cores are positioned on the members arranged in a row, and the ferrite cores have a vertically mounted posture in which the longitudinal direction stands upright with respect to the printed circuit board.

  By adopting such a configuration, in the present invention, the lead end of the coil is connected to the electrode piece, and the electrode piece is provided with a terminal portion consisting of a planar portion, so that the electrode piece, that is, the terminal portion for electrical connection can be configured in a predetermined manner. . In this electrode piece, the planar portion serving as the terminal portion can be set to an appropriate size, and the plate thickness can also be set appropriately. Therefore, the resistance of the electrode knitted portion can be set appropriately, a desired current capacity can be obtained, and a large current capacity can be obtained to cope with a large current.

  Since a plurality of terminal portions are provided for one electrode piece, the electrical resistance can be reduced and the reliability of solder connection can be improved. In addition, since the terminal portion is provided with a plurality of rising edges for the edge surrounding the flat portion, a fillet is formed on each of the rising edges when soldering, and there are a plurality of solder fillets. Connection is ensured.

  Since the support is a member to which two electrode pieces are to be assembled, it has a plane portion extending between them, and the support is positioned on the upper part so that it is relatively placed on the upper part of the part. A wide plane can be set. Therefore, this can be used as a suction surface for automated mounting, and positioning can be performed with high accuracy.

  Further, by forming the support from a magnetic material such as ferrite, the leakage flux can be reduced in a configuration in which the support is disposed along the length of the ferrite core. Of course, a magnetic material having a sufficiently high electrical resistance as an insulator is used as the magnetic material for the support.

  In the present invention, the lead end of the coil is connected to the electrode piece, and the electrode piece is provided with a terminal portion consisting of a planar portion, so that the electrode piece, that is, the terminal portion for electrical connection can be configured as desired. The position of the terminal portion is determined in the component, and positioning can be accurately performed in component mounting.

  Since this electrode piece can set the size of the planar portion to be the terminal portion and can also set the plate thickness as appropriate, the desired current capacity can be obtained, and the current capacity can be increased to cope with a large current. In addition, since a plurality of terminal portions are provided for each electrode piece, it is possible not only to reduce the electric resistance but also to improve the reliability of the solder connection (there is a very low possibility that all the terminals will have poor connection, and at least one Can be securely connected). As a result, the solder connection can be stably obtained corresponding to a large current, and can be preferably applied to automated mounting.

  1 and 2 show a first embodiment of the present invention. In this embodiment, the choke coil has a rod-shaped ferrite core 1, and a wire 2 is wound around the periphery of the ferrite core 1 to make a coil 3. And the wire 2 is comprised so that it may respond to the use of a large current (several [A] -10 dozens [A]: 100 [A] or less) by increasing current capacity by making a wire diameter thick.

  In the coil 3, as shown in FIG. 2B, the lead end 31 is led out at both ends along the length of the ferrite core 1, and the electrode pieces 4 and 4 are positioned at both ends of the ferrite core 1, respectively. And these electrode pieces 4 and 4 are assembled | attached and supported to the support body 5 of the arrangement | positioning along the length of the ferrite core 1. As shown in FIG.

  The electrode piece 4 is formed by bending a metal plate material in a predetermined manner. As shown in FIG. 2A, the electrode piece 4 is provided with a notch portion 41 at a predetermined portion and at least two terminal portions 42 each having a planar portion. The lead end 31 of the coil 3 is fitted into the notch 41 and electrically connected by solder or the like. In this embodiment, the electrode piece 4 is formed of a rectangular plate, and the two opposing sides are bent to the same side, assembled so that one bent edge is embedded in the support 5, and the other bent edge is cut out at the center. The left and right sides are two flat portions (terminal portions 42). In addition, the metal plate material forming the electrode piece 4 has a predetermined large plate thickness, and the current capacity is increased to correspond to the use of a large current.

  The support 5 is made of an insulating material such as a resin material. Further, the support 5 may be formed of a magnetic material such as ferrite. In that case, the magnetic material has a sufficient electrical resistance equivalent to that of the insulator in order to obtain good insulation for the two electrode pieces 4 and 4. High materials will be used. By forming the support 5 from a magnetic material, the magnetic flux leakage can be reduced because of the arrangement along the coil 3, and as a result, a large inductance can be obtained.

  Therefore, in this embodiment, the support body 5 is arranged along the length of the ferrite core 1, the terminal portion 42 is located on the opposite side of the ferrite core 1, and the length of the ferrite core 1 extends along the length of the printed circuit board. It becomes the mounting posture.

  In this way, the lead end 31 of the coil 3 is connected to the electrode piece 4, and the electrode piece 4 is provided with the terminal portion 42 formed of a planar portion, so that the electrode piece 4, that is, the terminal portion 42 for electrical connection is configured in a predetermined manner. it can. Therefore, the position of the terminal portion 42 is determined in the component, and therefore positioning can be performed accurately in component mounting.

  And this electrode piece 4 can set the plane part used as the terminal part 42 to an appropriate size, and can also set board thickness suitably. Therefore, a desired current capacity can be obtained, and a large current capacity can be obtained to cope with a large current. Since a plurality of terminal portions 42 are provided for four electrode pieces, the electrical resistance can be reduced and the reliability of solder connection can be improved.

  In this case, since the support body 5 is a top plate of the component and is a flat surface, it can be used as a suction surface during automatic mounting. For this reason, positioning can be performed with high accuracy, and it can be accurately mounted at a predetermined position on the printed circuit board, and automated mounting can be performed with high reliability and high quality. Therefore, according to the present invention, the solder connection can be stably obtained corresponding to a large current, and can be preferably applied to automated mounting.

  3 and 4 show a second embodiment of the present invention. In this embodiment, the choke coil is basically the same as that of the first embodiment, and the wire 2 is wound around the outer periphery of the rod-shaped ferrite core 1 to form a coil 3, and the wire 2 has a thick wire diameter, etc. Therefore, the current capacity is increased so that it can be used for large current applications. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In this embodiment, the electrode piece 4 is formed from a strip material. In other words, the electrode piece 4 is formed into a frame shape with one side being the open side by bending both ends of the strip plate material into a substantially L shape, and the two electrode pieces 4 are placed side by side with the release side in parallel. The ferrite core 1 is positioned in a double-lined frame of electrode pieces 4. And the open | release side edge part of the electrode piece 4 becomes a plane site | part, and they become the two terminal parts 42 and 42. FIG. The ferrite core 1 has two electrode pieces 4 and 4 arranged in a horizontal direction along the length, and the lead end 31 is fitted into a hole 43 provided at one position of the electrode piece 4 and electrically connected by solder or the like. .

  The configuration of the ferrite core 1 is preferably a configuration in which the longitudinal mounting orientation along the length of the printed circuit board as in the present embodiment is advantageous from the advantage that the component height can be reduced. On the contrary, the end face of the ferrite core 1 can be fixed to the support 5 side so as to have a vertical mounting posture. As described above, there is an advantage that the occupied area of the component can be reduced in the vertical mounting posture with respect to the printed circuit board.

  Also in this case, since the lead end 31 of the coil 3 is connected to the electrode piece 4 and the electrode piece 4 is provided with the terminal portion 42 formed of a planar portion, the electrode piece 4, that is, the terminal portion 42 for electrical connection is configured in a predetermined manner. it can. The position of the terminal portion 42 is determined in the component, and positioning can be accurately performed in component mounting. Since a plurality of terminal portions 42 are provided for each of the four electrode pieces, the electrical resistance can be reduced and the reliability of solder connection can be improved. Therefore, even in this embodiment, the solder connection can be stably obtained corresponding to a large current, and can be preferably applied to automated mounting.

  5 and 6 show a third embodiment of the present invention. In this embodiment, the choke coil is basically the same as in the first and second embodiments, and the wire 2 is wound around the outer periphery of the rod-shaped ferrite core 1 to form a coil 3. And the wire 2 is comprised so that it may respond to the use of a large current by increasing current capacity, for example by thickening a wire diameter. The same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  In this embodiment, the electrode piece 4 is formed of a strip plate material. However, as shown in FIG. 6B, the strip plate material is bent in multiple stages in a crank shape so that there are two flat portions. They are made to be two terminal portions 42, 42. Then, two electrode pieces 4 are arranged in parallel so that the support body 5 supports between them, and the ferrite core 1 is positioned on the two members arranged by the electrode pieces 4. The ferrite core 1 has an end face fixed to the arrangement of the electrode pieces 4 and 4 and is vertically arranged. The lead end 31 is fitted into a hole 43 provided at one position of the electrode piece 4 and electrically connected by solder or the like. Let

  As described above, the electrode piece 4 is formed by bending the strip plate material into a crank shape in multiple stages, and the two flat portions separated from each other are the terminal portions 42 and 42. Here, the terminal portion 42 has a form in which both edges rise by crank-shaped multistage bending, and has a plurality of rising edge portions 44. In mounting the choke coil, since the terminal portion 42 is placed on the pattern portion of the printed board and soldered, a solder fillet is formed on the rising edge portion 44. In this case, since the terminal portion 42 has two rising edge portions 44 at the edge portion surrounding the flat portion, two solder fillets are formed, and as a result, electrical connection can be reliably performed. Can be made highly reliable.

  Also in this case, since the lead end 31 of the coil 3 is connected to the electrode piece 4 and the electrode piece 4 is provided with the terminal portion 42 formed of a planar portion, the electrode piece 4, that is, the terminal portion 42 for electrical connection is configured in a predetermined manner. In addition, the position of the terminal portion 42 is determined in the component, and positioning can be accurately performed in component mounting. Since a plurality of terminal portions 42 are provided for each of the four electrode pieces, the electrical resistance can be reduced and the reliability of solder connection can be improved.

  Further, since the ferrite core 1 has a vertical mounting posture in which the longitudinal direction stands upright with respect to the printed circuit board, there is an advantage that the area occupied by the components can be reduced. And since the upper end of the upright vertical posture is a plane, the ferrite core 1 can be used as a suction surface during automatic mounting. Therefore, the positioning can be performed with high accuracy and the mounting can be accurately performed at a predetermined position of the printed circuit board, and the automatic mounting can be performed with high reliability and high quality.

  Therefore, even in this embodiment, the solder connection can be stably obtained corresponding to a large current, and can be preferably applied to automated mounting.

(A) is the perspective view which shows 1st Embodiment of the choke coil which concerns on this invention, (b) is the perspective view seen from the contact surface side. (A) is a front view of the choke coil shown in FIG. 1, and (b) is a side view thereof. (A) is the perspective view which shows 2nd Embodiment of the choke coil which concerns on this invention, (b) is the perspective view which looked at it from the contact surface side. (A) is a front view of the choke coil shown in FIG. 3, and (b) is a side view thereof. (A) is the perspective view which shows 3rd Embodiment of the choke coil which concerns on this invention, (b) is the perspective view which looked at it from the contact surface side. (A) is a front view of the choke coil shown in FIG. 5, and (b) is a side view thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ferrite core 2 Wire 3 Coil 31 Lead end 4 Electrode piece 41 Notch part 42 Terminal part 43 Hole part 44 Rising edge part 5 Support body

Claims (6)

It has a rod-shaped ferrite core, and a wire is wound around the outer periphery of the ferrite core in a predetermined coil to form a coil, the wire being a choke coil for high current use,
An electrode piece formed by bending a metal plate,
A support body that is formed of an insulating material such as a resin material and supports at least two of the electrode pieces,
The electrode piece is provided with a notch or a hole for fitting and electrically connecting the lead end of the coil, and at least two plane portions are formed by bending to contact the pattern portion of the printed circuit board. A choke coil having a terminal portion.   2. The choke coil according to claim 1, wherein the terminal portion is provided with a plurality of rising edge portions that are raised by bending at an edge portion surrounding the flat portion.   The choke coil according to claim 1, wherein the support is made of a magnetic material such as ferrite. The coil has lead ends that extend along the length of the ferrite core.
The electrode pieces are positioned at both ends of the ferrite core, the support is disposed along the length of the ferrite core, the terminal portion is positioned on the opposite side of the ferrite core, and the printed circuit board. The choke coil according to any one of claims 1 to 3, wherein the choke coil has a lateral mounting posture along which the longitudinal axis of the ferrite core extends. The electrode pieces are each formed into a frame shape with one side being the open side by bending both ends of the band plate material into L-shapes,
Two of the electrode pieces are arranged such that the support side is supported across the two with the release side arranged in parallel downward,
Positioning the ferrite core in a frame of two rows by the electrode pieces;
The choke coil according to any one of claims 1 to 3, wherein the ferrite core has a lateral mounting posture along a longitudinal direction with respect to the printed circuit board. The electrode piece is formed by bending a strip plate material into a crank shape in multiple stages to form a plurality of the terminal portions,
Two electrode pieces are juxtaposed in parallel and the support is placed between the two,
The ferrite core is positioned on two members arranged by the electrode pieces,
4. The choke coil according to claim 1, wherein the ferrite core has a vertical mounting posture in which a longitudinal direction stands upright with respect to the printed circuit board. 5.

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