CN107342160B - Electromagnetic inductor and method for manufacturing electromagnetic inductor - Google Patents
Electromagnetic inductor and method for manufacturing electromagnetic inductor Download PDFInfo
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- CN107342160B CN107342160B CN201710288398.7A CN201710288398A CN107342160B CN 107342160 B CN107342160 B CN 107342160B CN 201710288398 A CN201710288398 A CN 201710288398A CN 107342160 B CN107342160 B CN 107342160B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/04—Arrangements of electric connections to coils, e.g. leads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F37/00—Fixed inductances not covered by group H01F17/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
- H01F27/2828—Construction of conductive connections, of leads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
- H01F27/292—Surface mounted devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
- H01F2027/297—Terminals; Tapping arrangements for signal inductances with pin-like terminal to be inserted in hole of printed path
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- Power Engineering (AREA)
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- Coils Of Transformers For General Uses (AREA)
- Coils Or Transformers For Communication (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention provides an electromagnetic inductor which prevents short circuit and is more miniaturized. The electromagnetic inductor is provided with: a body part for winding a coil; a flange portion extending radially outward from an axial end of the main body portion; a terminal block which extends in a direction perpendicular to the axial direction of the main body at the front end of the flange portion and on which a plurality of terminals connected to the coil are provided; and a coil wound around the main body, the plurality of terminals being bent into a right-angled L-shape and arranged in a direction in which the terminal block extends, one end of each of the plurality of terminals protruding from a surface of the terminal block on a side opposite to a side in which the main body is arranged, a wiring groove being formed between a group of two adjacent terminals among the plurality of terminals of the terminal block, an outgoing line of the coil being led out from the main body to an outer side of the terminal block in an axial direction of the main body through the inside of the wiring groove, the coil being bent so as to embrace the outgoing line from both sides with each of the one ends of the two adjacent terminals of the wiring groove through which the outgoing line passes, and being connected by welding.
Description
Technical Field
The present invention relates to an electromagnetic inductor and a method for manufacturing the electromagnetic inductor, and more particularly to an electromagnetic inductor used for a transformer and/or a choke coil for mounting on a substrate and a method for manufacturing the electromagnetic inductor.
Background
Conventionally, a transformer for mounting a substrate, which is mounted on a wiring substrate (printed wiring board), has been known as a component of an electrical apparatus or the like. The transformer for mounting a substrate includes a bobbin having a cylindrical shape, a primary coil (winding) and a secondary coil wound around an axis of the bobbin, and the two coils are insulated from each other by winding, for example, an insulating tape. The bobbin includes a plurality of terminals connected to end portions (ends) of lead wires of the coil, and the terminals are respectively a primary side terminal or a secondary side terminal of the transformer for mounting the substrate. In this way, the coil is connected to a connection pad portion or the like of a conductive path provided on the wiring board via the terminal provided in the bobbin.
For example, patent document 1 discloses an electromagnetic inductor for mounting a substrate, which includes a cylindrical body portion, flange portions provided at both ends of the body portion, and a bobbin in which a terminal block is integrally formed. The electromagnetic inductor also functions as a transformer. A plurality of terminals to which the ends of lead wires of the coil are connected are formed in a row on each terminal block. The plurality of terminals are inserted into the wiring substrate and connected to the components on the wiring substrate.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-31978
Disclosure of Invention
Technical problem
In recent years, with the miniaturization of electric equipment and the like, further miniaturization of the electromagnetic inductor as described above has been demanded. On the other hand, in recent years, the current flowing through the coil of the electromagnetic inductor has become larger due to the increase in capacity of the switching power supply mounted on the wiring board. Therefore, it is necessary to further thicken (or increase the number of wires used) the wire such as litz wire used for the coil. Conventionally, when lead wires of a coil are connected to terminals provided in a bobbin, the lead wires are wound around the terminals and then soldered to connect the lead wires. With the thickening of the lead wire (wire), two adjacent terminals are mostly used as a line of one lead wire. In this case, since the lead wires are wound around the terminals and soldered, the portions wound around the terminals are often protruded to the outside of the two terminals. Therefore, from the viewpoint of preventing short-circuiting, it is necessary to increase the distance between the terminals provided in the bobbin.
As described above, the electromagnetic inductor is required to be downsized, and on the other hand, the overall size thereof is increased as a result of increasing the distance between the terminals of the bobbin. The present invention has been made to solve the above problems, and an object thereof is to provide an electromagnetic inductor which prevents a short circuit and is further miniaturized.
Technical scheme
In order to achieve the above object, the present invention provides an electromagnetic inductor comprising: a body part for winding a coil; a flange portion extending radially outward from an axial end of the main body portion; a terminal block having a plurality of terminals connected to the coil and extending in a direction perpendicular to the axial direction of the body portion at a distal end portion of the flange portion; a coil wound around the main body, the plurality of terminals being arranged in a row in an extending direction of the terminal block, at least some of the plurality of terminals each having an L-shape bent at right angles, one end of each of the at least some of the plurality of terminals protruding from a surface of the terminal block on a side opposite to a side where the main body is arranged, a wiring groove for leading out a lead wire of the coil from the main body to an outside of the terminal block in an axial direction of the main body being formed between a pair of adjacent two terminals among the at least some of the plurality of terminals of the terminal block, the lead wire of the coil being led out from the main body to the outside of the terminal block in the axial direction of the main body through the inside of the wiring groove, the one end of each of the adjacent two terminals of the wiring groove through which the lead wire is led out is sandwiched, the lead-out wire is bent so as to embrace the lead-out wire from both sides, and is connected to the lead-out wire by welding.
According to the present invention thus constituted, the lead wire of the coil wound around the main body is led out from the main body to the outside of the terminal block in the axial direction of the main body by being formed in the wiring groove of the terminal block, and one end of each of two adjacent terminals sandwiching the wiring groove is bent so as to hold the lead wire led out from both sides, and is connected to the lead wire led out by welding. Thus, the lead wires of the coil to be led out can be fixed to the two terminals inside the two terminals without being wound around one end of the two terminals sandwiching the wiring groove. Further, since soldering can be performed on the inner sides of the two terminals with the wiring groove interposed therebetween, it is possible to reduce the projection of solder to the outer sides of the two terminals and to avoid short-circuiting, as compared with a structure in which soldering is performed by winding lead wires around the respective terminals.
In the present invention, it is preferable that the length of the one end of each of the two adjacent terminals protruding from the terminal block is longer than half of the length between the two adjacent terminals.
According to the present invention thus constituted, the length of one end of the terminal protruding from the terminal block is set to be longer than half the length between two adjacent terminals sandwiching the wiring groove, so that the bent one end of the terminal can more stably hold the lead wire drawn out through the inside of the wiring groove.
In order to achieve the above object, the present invention provides a method of manufacturing an electromagnetic inductor, the electromagnetic inductor being manufactured by mounting a coil on a bobbin, the bobbin including: a body part for winding a coil; a flange portion extending radially outward from an axial end of the main body portion; a terminal block on which a plurality of terminals connected to a coil are provided, the plurality of terminals being arranged in a row in an extending direction of the terminal block, at least some of the plurality of terminals being formed in an L-shape bent at right angles, one end of each of the at least some of the plurality of terminals protruding from a surface of the terminal block on a side opposite to a side where the main body is arranged, and a wiring groove for drawing a lead wire of the coil out of the main body to an outside of the terminal block in an axial direction of the main body is formed between two adjacent terminals in a set of the at least some of the plurality of terminals of the terminal block, the terminal block including: a step of winding a coil around the body portion; a step of drawing a lead wire of the coil from the main body portion to an outside of the terminal block in an axial direction of the main body portion through the wiring groove; and bending the one end of each of the two adjacent terminals sandwiching the wiring groove through which the drawn lead wire passes so as to hold the drawn lead wire from both sides, and connecting the one end to the drawn lead wire by welding.
According to the present invention thus constituted, the lead wire of the coil wound around the main body is led out from the main body to the outside of the terminal block in the axial direction of the main body through the wiring groove provided in the terminal block of the coil bobbin, one end of each of two adjacent terminals sandwiching the wiring groove is bent so as to hold the lead wire led out from both sides, and the lead wire led out is connected to the terminal block by welding, thereby manufacturing the electromagnetic inductor. Thus, the lead wires of the coil to be led out can be brought into contact with the two terminals and temporarily fixed inside the two terminals without being wound around one end of the two terminals sandwiching the wiring groove, and then can be electrically connected to the two terminals and fixed.
Technical effects
According to the present invention, it is possible to provide a more compact electromagnetic inductor that prevents short-circuiting.
Drawings
Fig. 1 is a perspective view of an electromagnetic inductor according to an embodiment of the present invention.
Fig. 2 is a perspective view of a terminal block a of a bobbin before a coil is mounted in accordance with an embodiment of the present invention.
Fig. 3 is a front view of a terminal block a of a bobbin before a coil is mounted according to an embodiment of the present invention.
Fig. 4 is a perspective view of a terminal block a of a bobbin in a state where a lead wire of a primary coil is drawn out in an electromagnetic inductor according to an embodiment of the present invention.
Fig. 5 is a perspective view of a terminal block a of a bobbin in a state in which a lead wire of a primary coil is temporarily fixed in an electromagnetic inductor according to an embodiment of the present invention.
Fig. 6 is a front view of a terminal block a of a bobbin in a state in which lead wires of a primary coil are temporarily fixed in an electromagnetic inductor according to an embodiment of the present invention.
Fig. 7 is a front view of a terminal block a of a bobbin in a state in which lead wires of a primary coil are connected by soldering in an electromagnetic inductor according to an embodiment of the present invention.
Fig. 8 is a front view of a terminal block a of a bobbin in a state in which lead wires of a primary coil are temporarily fixed in an electromagnetic inductor according to a modification of the embodiment of the present invention.
Fig. 9 is a front view of a terminal block B of a bobbin before a coil is mounted in an electromagnetic inductor according to an embodiment of the present invention.
Description of the symbols
1: electromagnetic inductor
10: coil framework
11: main body part
12: flange part
13: terminal block A
13 a: base part
13 b: wiring groove
14: terminal block B
14 a: base part
14 b: wiring groove
15: plug-in hole
16. 17: terminal with a terminal body
16a, 17 a: one end of
16b, 17 b: the other end of the tube
20: coil
21: primary coil
22: secondary coil
23: solder
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals denote the same or corresponding parts unless otherwise specified, and for convenience, the components or parts may be shown in a manner of being different in scale of reduction in the lateral and vertical directions from the actual ones.
Fig. 1 is a perspective view of an electromagnetic inductor 1 according to an embodiment of the present invention. The electromagnetic inductor 1 has a bobbin 10 and a coil 20 wound around the bobbin 10. In the drawings including fig. 1, for the sake of simplifying the explanation, coordinate axes in the x direction, the y direction, and the z direction perpendicular to each other are shown.
The bobbin 10 includes a body 11 for winding the coil 20, flange portions 12 formed at both ends of the body 11 in the axial direction (x direction), and a terminal block a13 and a terminal block B14 formed on the flange portions 12 at both ends, and these components are integrally molded. The flange portion 12 extends radially outward from both axial ends of the body portion 11 around the axial direction of the body portion 11. However, the bobbin 10 may be configured by integrally attaching and fixing the above-described components that are separated from each other. The bobbin 10 is made of an insulating resin such as polyethylene terephthalate (PET) or Phenol (PF).
The bobbin 10 has an insertion hole 15 penetrating the body 11 and the flange 12 in the axial direction of the body 11. The electromagnetic inductor 1 according to one embodiment of the present invention can be used as a transformer for mounting a substrate (for inserting a substrate) by inserting and fixing a magnetic core into an insertion hole of the bobbin 10. However, the present invention can also be applied to a choke coil and the like.
The coils 20 include one or more primary coils 21, and one or more secondary coils 22. For the sake of simplicity of explanation, fig. 1 shows a state before the terminals of the terminal block a13 are connected to the lead-out wires of the primary coil 21, but it should be understood that the lead-out wires of the primary coil 21 of the actual electromagnetic inductor 1 are connected to the terminals of the terminal block a13 as described later.
In one embodiment of the present invention, since the connection destination of the lead wire of the primary coil 21 is lower in voltage than the connection destination of the lead wire of the secondary coil 22, the lead wire used for the primary coil 21 needs to be thicker than the lead wire used for the secondary coil 22. For example, in the case where the connection target of the lead line of the primary coil 21 is an input of 12V and the connection target of the lead line of the secondary coil 22 is an output of 100V, the cross-sectional area or the number of lead lines used for the lead line of the primary coil 21, i.e., the primary coil, needs to be increased or increased to about 8 times the lead line of the secondary coil 22. However, the primary coil 21 may be used as an output (secondary coil) and the secondary coil 22 may be used as an input (primary coil).
Fig. 2 is a perspective view of the terminal block a13 of the bobbin 10 before the coil 20 is mounted, and fig. 3 is a front view thereof. The terminal block a13 includes a plurality of terminals 16 extending in a direction (y direction) perpendicular to the axial direction of the body portion 11 at the distal end portion of the flange portion 12 and connected to lead wires of the primary coil 21. The terminal block a13 has a base portion 13a protruding like a ledge at the base portion, and the base portion 13a serves as a contact surface when the magnetic core is attached.
Each terminal 16 is substantially bent into a right-angled L-shape, and is arranged and mounted in line along the extending direction (y direction) of the terminal block a 13. Preferably, a part of the terminal 16 is attached to the terminal block a13 by penetrating the terminal block a 13. For example, the L-shaped bent portion of the terminal 16 is embedded in the terminal block a13, and is attached so that both end portions protrude from the terminal block a 13.
In each terminal 16, one end 16a of the terminal 16 protrudes from a surface of the terminal block a13 on the side opposite to the side where the body portion 11 is arranged. Preferably, the one end 16a protrudes in a direction substantially parallel to the axial direction of the main body portion 11 (protrudes in the + x direction). In each terminal 16, the other end 16b of the terminal 16 protrudes from the surface of the terminal block a13 opposite to the side where the insertion hole 15 is arranged. Preferably, the other end 16b protrudes in a direction substantially perpendicular to the axial direction of the main body portion 11 and the extending direction of the terminal block a13 (protrudes in the + z direction).
One end 16a is connected to a lead wire of the primary coil 21, and the other end 16b is inserted into the wiring board and connected to a component on the wiring board. As described above, the wire (lead wire) used for the primary coil 21 needs to be thicker than the wire (lead wire) used for the secondary coil 22. Therefore, in order to secure the cross-sectional area of the terminal 16 connected to the lead wire of the primary coil 21, the lead wire of one primary coil 21 is connected to two adjacent terminals 16, and the two connected terminals 16 are used as one line for connection to the wiring board, as in the conventional art.
In one example, the wire used for the coil 20 is one or more litz wires that are typically used for high frequency currents. In another example, 120 litz wires of 0.2 mm are connected to two adjacent terminals 16 in order to pass a desired current. By using a plurality of litz wires in this way, a wiring having flexibility compared to using one thick wire can be obtained. However, all leads may be used for the coil 20. For example, one or more single wires may be used for the coil 20.
The two adjacent terminals 16 connected to the lead-out lines of one primary coil 21 as described above may be considered as a set of terminal pairs 16'. In this case, the plurality of terminals 16 according to the embodiment of the present invention includes a plurality of terminal pairs 16'. However, the terminal pair 16 'is a concept for explaining the positional relationship of the adjacent terminals 16, and it should be noted that the two terminals 16 constituting the terminal pair 16' are not electrically connected inside the terminal block a 13.
A wiring groove 13b for drawing (wiring) the lead line of the primary coil 21 from the main body portion 11 to the outside (+ x direction) of the terminal block a13 in the axial direction of the main body portion 11 is formed between the two terminals 16 of the terminal block a13, which constitute each terminal pair 16'. The wiring groove 13b has a width capable of accommodating the lead-out wire of one primary coil 21.
Fig. 4 is a perspective view of the terminal block a13 in the state of fig. 1, showing the terminal block a13 in a state where the lead line of the primary coil 21 is led out through the inside of the wiring groove 13 b. As shown in the drawing, the primary coil 21 is wound around the main body 11, and the lead line of the primary coil 21 is led out from the main body 11 to the outside of the terminal block a13 in the axial direction of the main body 11 through the wiring groove 13 b. The end (tip) of the lead wire is located on the same side as the one end 16a with respect to the terminal block a 13.
In the case where the primary coil 21 includes a plurality of primary coils 21, the primary coils 21 connected to different pairs of terminals 16' are insulated from each other by winding, for example, an insulating tape in the main body portion 11. The secondary coil 22 is also wound around the main body 11 in the same manner, and is insulated from the primary coil 21 by winding, for example, an insulating tape.
Fig. 5 is a perspective view of the terminal block a13 in a state where the lead wire of the primary coil 21 is temporarily fixed from the state shown in fig. 4, and fig. 6 is a front view thereof. As shown in the drawing, one ends 16a of the two terminals 16 constituting the terminal pair 16' sandwiching the wiring groove 13b are bent so as to embrace the lead wires drawn out through the inside of the wiring groove 13b from both sides. With such a configuration, in the present embodiment, the lead wires of the primary coil 21 can be temporarily fixed to the inside of the two terminals 16 while being in contact with the two terminals 16 without winding the lead wires of the primary coil 21 around the one ends 16a of the two terminals 16 sandwiching the wiring groove 13 b.
Fig. 7 is a front view of the terminal block a13 to which the lead wire of the primary coil 21 is connected by soldering, for comparison with the terminal block a 113 to which the lead wire of the primary coil 21 is connected by soldering in the conventional electromagnetic inductor. The conventional electromagnetic inductor includes a terminal block a 113 having the same shape as the terminal block a13 according to one embodiment of the present invention, but as shown in fig. 7, the lead wires of the primary coil 21 are wound around one end 16a of the two terminals 16, and then soldered by applying solder 23. In contrast, in the present embodiment, as shown in fig. 7, the lead wire of the primary coil 21 and the one end 16a of the two terminals 16 bent so as to embrace the lead wire are connected by soldering with the solder 23.
With such a configuration, in the present embodiment, the lead lines of the primary coil 21 routed in the wiring groove 13b can be electrically connected to and fixed to the two terminals 16 sandwiching the wiring groove 13 b. Further, since soldering can be performed on the inner sides of the two terminals 16 sandwiching the wiring groove 13b, it is possible to reduce the projection of solder to the outer sides of the two terminals 16 and to avoid short-circuiting, as compared with the conventional structure in which soldering is performed by winding lead wires around the respective terminals 16. Therefore, as compared with the conventional structure in which lead wires are wound around the terminals 16 and soldered, the distance between the terminals 16 can be reduced, and as a result, the width of the terminal block a13 in the arrangement direction (y direction) of the terminals 16 can be reduced as shown in fig. 7. Therefore, the electromagnetic inductor 1 as a whole can be further miniaturized. Further, since it becomes unnecessary to wind lead wires (wires) to the one ends 16a of the two terminals 16, the amount of used wires and solder can be reduced.
In a modification, the terminal block a13 may be configured such that the height of the position where the one end 16a of the terminal 16 protrudes from the terminal block a13 is different between the two terminals 16 constituting the terminal pair 16'. Fig. 8 is a front view of the terminal block a13 in a state where the lead wires of the primary coil 21 of the modification are temporarily fixed. As shown in fig. 8, the two terminals 16 constituting the terminal pair 16' sandwiching the wiring groove 13b have different heights (z direction) of the respective projecting root portions. One ends 16a of the two terminals 16 are bent so as to hold lead wires drawn out through the wiring grooves 13b from both sides. With such a configuration, in the present embodiment, the one end 16a of the bent terminal 16 can more stably hold the lead wire drawn through the wiring groove 13 b.
In another modification, the length of the protrusion of the one end 16a of the terminal 16 may be set to be longer than half the length between the two terminals 16 sandwiching the wiring groove 13b in the bending direction. With such a configuration, in the present embodiment, the one end 16a of the bent terminal 16 can more stably hold the lead wire drawn through the wiring groove 13 b.
In another modification, some of the terminals (for example, two arbitrary adjacent terminals) attached to the terminal block a13 are rod-shaped terminals, and are arranged and attached along the extending direction (y direction) of the terminal block a13 in the same manner as the remaining some of the terminals 16 configured as shown in fig. 2. One end of the rod-like terminal is implanted into the terminal block a13, and the other end is attached so as to protrude from the surface of the terminal block a13 opposite to the side where the insertion hole 15 is arranged, similarly to the other end 16b shown in fig. 2. The other end of the rod-like terminal is inserted into the wiring board and connected to a component on the wiring board, similarly to the other end 16b shown in fig. 2. The other end of one of the rod-like terminals is wound around a lead wire of one primary coil 21 and connected by soldering. The wiring groove 13b may not be formed between adjacent ones of the rod-like terminals.
In the other modification described above, the configuration of only the rod-like terminal is different from the configuration of the terminal block a13 shown in fig. 2. By adopting such a configuration, in the present embodiment, the terminal block a13 can be configured to have the terminals 16 and the wiring grooves 13b configured as shown in fig. 2, depending on the number of lead wires of the primary coil 21 wound around two terminals as needed.
Fig. 9 is a front view of the terminal block B14 of the bobbin 10 before the coil 20 is mounted. The terminal block B14 includes a plurality of terminals 17 extending in a direction (y direction) perpendicular to the axial direction of the body 11 at the distal end of the flange portion 12 on the other side corresponding to the distal end of the flange portion 12 on which the terminal block a13 is formed, and connected to lead wires of the secondary coil 22. The terminal block B14 has a base portion 14a protruding like a convex brim at the base portion, and the base portion 14a serves as a contact surface when the magnetic core is attached.
Each terminal 17 is substantially bent in an L-shape, similarly to the terminal 16, and is arranged and mounted along the extending direction (y direction) of the terminal block B14. Preferably, a part of the terminal 17 is attached to the terminal block B14 by penetrating the terminal block B14. In each terminal 17, similarly to the terminal 16, one end 17a of the terminal 17 protrudes from a surface of the terminal block B14 on the side opposite to the side where the body portion 11 is arranged, and the other end 17B of the terminal 17 protrudes from a surface of the terminal block B14 on the side opposite to the side where the insertion hole 15 is arranged. Wiring grooves 14B for drawing the lead wires of the secondary coil 22 from the main body 11 to the outside (in the (-x direction)) of the terminal block B14 in the axial direction of the main body 11 are formed between the terminals 17 of the terminal block B14.
One end 17a is connected to a lead wire of the secondary coil 22, and the other end 17b is inserted into the wiring board and connected to a component on the wiring board. As described above, the lead line of the secondary coil 22 is thinner than the lead line of the primary coil 21. Therefore, as shown in fig. 1, the lead wire of one secondary coil 22 is led out through the wiring groove 14b and wound around one end 17 a. Then, the lead wires of the secondary coil 22 are connected by soldering. This enables electrical connection and fixation. When the secondary coil 22 includes a plurality of secondary coils 22, the secondary coils 22 connected between different terminals 17 are insulated from each other by winding, for example, an insulating tape around the main body 11.
The configuration of the terminal block B14 may be any other known terminal block or terminal as long as it is a terminal block or terminal that can connect the lead wire of one secondary coil 22 to one terminal 17a by soldering. For example, the terminal 17 may not be bent L-shaped.
Next, a method for manufacturing the electromagnetic inductor 1 will be described. For simplicity of explanation, the coil 20 is described as including one primary coil 21 and one secondary coil 22. First, the bobbin 10 shown in fig. 1 is prepared, and the coil 20 including one primary coil 21 and one secondary coil 22 is wound around the body 11 while being insulated from each other.
Next, one lead wire of the primary coil 21 is led out from the main body 11 to the outside of the terminal block a13 in the axial direction of the main body 11 through the wiring groove 13 b. Then, one ends 16a of the two terminals 16 constituting the terminal pair 16' sandwiching the wiring groove 13b are bent so as to embrace the drawn lead wire and temporarily fixed. The lead-out wire on the other side of the primary coil 21 is also temporarily fixed to the other terminal pair 16' in the same manner.
On the other hand, one lead wire of the secondary coil 22 is drawn out from the main body 11 to the outside of the terminal block B14 in the axial direction of the main body 11 through the wiring groove 14B, and wound around the one end 17a of the terminal 17 to be temporarily fixed. Similarly, the other lead wire of the secondary coil 22 is drawn out through the other wiring groove 14b, wound around the one end 17a of the other terminal 17, and temporarily fixed.
After the temporary fixation is performed as described above, the connection is performed by dipping the substrate into a solder bath or the like and welding the substrate at the temporarily fixed position. With such a configuration, in the present embodiment, the lead wires of the primary coil 21 are not wound around the one ends 16a of the two terminals 16 sandwiching the wiring groove, but are electrically connected to and fixed to the two terminals 16 inside the two terminals 16. Further, it is possible to prevent the solder from bulging to the outside of the two terminals 16 and avoid short-circuiting. Further, the electromagnetic inductor 1 is manufactured by bending the one ends 16a of the two terminals 16 using a simple jig without winding the lead wires around the one ends 16a of the two terminals 16, and then performing solder dipping. Further, since the winding of the lead wire is not required, variation in connection state caused by the winding work can be eliminated.
Next, the operation and effect of the electromagnetic inductor 1 according to the embodiment of the present invention will be described. In the present embodiment, the lead wire of the primary coil 21 wound around the main body 11 is led out from the main body 11 to the outside of the terminal block a13 in the axial direction of the main body 11 through the wiring groove 13b formed in the terminal block a13, and one end 16a of each of two adjacent terminals 16 sandwiching the wiring groove 13b is bent so as to embrace the lead wire led out from both sides, and is connected to the lead wire led out by soldering. Thus, the lead wires of the primary coil 21 that are led out can be electrically connected to and fixed to the two terminals 16 inside the two terminals 16 without being wound around the one ends 16a of the two terminals 16 that sandwich the wiring groove 13 b. Further, since soldering can be performed on the inner sides of the two terminals 16 sandwiching the wiring groove 13b, it is possible to reduce the projection of solder to the outer sides of the two terminals 16 and to configure a structure capable of avoiding short-circuiting, as compared with a structure in which soldering is performed by winding lead wires around the respective terminals 16.
In the present embodiment, the length of the one end 16a of the terminal 16 protruding from the terminal block a13 is set to be longer than half the length between two adjacent terminals 16 sandwiching the wiring groove 13b, so that the bent one end 16a of the terminal 16 can more stably hold the lead wire drawn out through the inside of the wiring groove 13 b.
The embodiments described above are examples for illustrating the present invention, and the present invention is not limited to these embodiments. Each embodiment can be applied to any embodiment of the present invention by appropriately combining the embodiments as long as no contradiction occurs. That is, the present invention can be variously modified without departing from the gist thereof.
Claims (5)
1. An electromagnetic inductor, comprising: a body part for winding a coil; a flange portion extending radially outward from an axial end of the main body portion; a terminal block having a plurality of terminals connected to the coil and extending in a direction perpendicular to the axial direction of the body portion at a distal end portion of the flange portion; a coil wound around the body portion,
the plurality of terminals are arranged in a row in an extending direction of the terminal block, at least some of the plurality of terminals are each formed in an L-shape bent at right angles, one end of each of the at least some of the plurality of terminals protrudes from a surface of the terminal block on a side opposite to a side where the main body portion is arranged,
a wiring groove for drawing out a lead wire of the coil from the main body portion to an outside of the terminal block in an axial direction of the main body portion is formed between a pair of adjacent two terminals among the plurality of terminals of the at least part of the terminal block,
a lead wire of the coil is led out from the main body portion to an outside of the terminal block in an axial direction of the main body portion through the wiring groove,
the one ends of the two adjacent terminals sandwiching the wiring groove through which the drawn lead wire passes are bent so as to embrace the drawn lead wire from both sides, and are connected to the drawn lead wire by welding.
2. The electromagnetic inductor of claim 1,
the length of the one end of each of the two adjacent terminals protruding from the terminal block is longer than half of the length between the two adjacent terminals.
3. A substrate-mounted transformer comprising the electromagnetic inductor according to claim 1 or 2.
4. A choke coil for mounting on a substrate, comprising the electromagnetic inductor according to claim 1 or 2.
5. A method of manufacturing an electromagnetic inductor, the electromagnetic inductor being manufactured by mounting a coil on a bobbin, the bobbin comprising: a body part for winding a coil; a flange portion extending radially outward from an axial end of the main body portion; a terminal block extending in a direction perpendicular to the axial direction of the body portion at a distal end portion of the flange portion and provided with a plurality of terminals connected to the coil,
the plurality of terminals are arranged in a row in an extending direction of the terminal block, at least some of the plurality of terminals are each formed in an L-shape bent at right angles, one end of each of the at least some of the plurality of terminals protrudes from a surface of the terminal block on a side opposite to a side where the main body portion is arranged,
a wiring groove for drawing out a lead wire of the coil from the main body portion to an outside of the terminal block in an axial direction of the main body portion is formed between a pair of adjacent two terminals among the plurality of terminals of the at least part of the terminal block,
the manufacturing method comprises the following steps:
a step of winding a coil around the body portion;
a step of drawing a lead wire of the coil from the main body portion to an outside of the terminal block in an axial direction of the main body portion through the wiring groove;
and bending the one end of each of the two adjacent terminals sandwiching the wiring groove through which the drawn lead wire passes so as to hold the drawn lead wire from both sides, and connecting the one end to the drawn lead wire by welding.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016092716A JP6637834B2 (en) | 2016-05-02 | 2016-05-02 | Electromagnetic inductor and method of manufacturing electromagnetic inductor |
| JP2016-092716 | 2016-05-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107342160A CN107342160A (en) | 2017-11-10 |
| CN107342160B true CN107342160B (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710288398.7A Active CN107342160B (en) | 2016-05-02 | 2017-04-27 | Electromagnetic inductor and method for manufacturing electromagnetic inductor |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6637834B2 (en) |
| KR (1) | KR102273354B1 (en) |
| CN (1) | CN107342160B (en) |
| DE (1) | DE102017004119A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7004142B2 (en) * | 2017-09-15 | 2022-01-21 | Tdk株式会社 | Coil device |
| JP6966722B2 (en) * | 2017-12-18 | 2021-11-17 | Tdk株式会社 | Coil device |
| KR102330542B1 (en) | 2019-07-12 | 2021-11-24 | 김익현 | Hair cap manufacturing device |
| WO2020054976A1 (en) | 2018-09-10 | 2020-03-19 | 김익현 | Apparatus for manufacturing hair cap |
| KR102090735B1 (en) | 2018-09-10 | 2020-03-18 | 김익현 | Hair cap manufacturing device |
| CN110931223A (en) * | 2018-09-20 | 2020-03-27 | 株式会社田村制作所 | Coil device |
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| JPH06333767A (en) * | 1993-05-26 | 1994-12-02 | Tdk Corp | Manufacture of common mode choke coil |
| CN1336674A (en) * | 2000-07-28 | 2002-02-20 | 达方电子股份有限公司 | Winding frame for transformer |
| JP2009218425A (en) * | 2008-03-11 | 2009-09-24 | Tdk Corp | Coil component and method for connecting and fixing winding terminal |
| CN202585054U (en) * | 2012-05-28 | 2012-12-05 | 慈溪市国兴电子有限公司 | Transformer inserted on circuit board |
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| KR19980061755A (en) * | 1996-12-31 | 1998-10-07 | 서두칠 | Flyback transformer |
| JP2008112753A (en) * | 2006-10-27 | 2008-05-15 | Tdk Corp | Lateral low-profile coil part, and soldering method of its winding terminal |
| JP2009105342A (en) * | 2007-10-25 | 2009-05-14 | Tdk Corp | Lateral coil component, bobbin, and method of connecting and fixing end of wire |
| JP4697676B2 (en) * | 2008-07-17 | 2011-06-08 | Ｔｄｋ株式会社 | Coil component and method of manufacturing coil component |
| JP2010073778A (en) * | 2008-09-17 | 2010-04-02 | Sumida Corporation | Surface-mounted coil component |
| TWI463508B (en) * | 2014-04-22 | 2014-12-01 | Yujing Technology Co Ltd | The improved structure of the transformer |
| JP2016031978A (en) | 2014-07-28 | 2016-03-07 | 田淵電機株式会社 | Electromagnetic inductor and manufacturing method of core for electromagnetic inductor |
| KR101594400B1 (en) * | 2014-12-29 | 2016-02-16 | 크로바하이텍(주) | Bobbin for a transformer and Transformer having the same |
-
2016
- 2016-05-02 JP JP2016092716A patent/JP6637834B2/en active Active
-
2017
- 2017-04-27 CN CN201710288398.7A patent/CN107342160B/en active Active
- 2017-04-27 DE DE102017004119.9A patent/DE102017004119A1/en not_active Withdrawn
- 2017-04-28 KR KR1020170054759A patent/KR102273354B1/en active IP Right Grant
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06333767A (en) * | 1993-05-26 | 1994-12-02 | Tdk Corp | Manufacture of common mode choke coil |
| CN1336674A (en) * | 2000-07-28 | 2002-02-20 | 达方电子股份有限公司 | Winding frame for transformer |
| JP2009218425A (en) * | 2008-03-11 | 2009-09-24 | Tdk Corp | Coil component and method for connecting and fixing winding terminal |
| CN202585054U (en) * | 2012-05-28 | 2012-12-05 | 慈溪市国兴电子有限公司 | Transformer inserted on circuit board |
| CN204130323U (en) * | 2014-08-25 | 2015-01-28 | 江西省高新超越精密电子有限公司 | A kind of transformer framework combination with new structure |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20170124463A (en) | 2017-11-10 |
| DE102017004119A1 (en) | 2017-11-02 |
| JP2017201658A (en) | 2017-11-09 |
| JP6637834B2 (en) | 2020-01-29 |
| KR102273354B1 (en) | 2021-07-06 |
| CN107342160A (en) | 2017-11-10 |
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