Coil device

Abstract

The present invention provides a coil device that can easily stabilize leakage characteristics, easily form an intermediate tap, easily control the number of windings, and also exhibit excellent heat dissipation. A skeleton (20) has a first winding portion (34a, 34b) around which a first winding (37) is wound, a second winding portion (35) around which a second winding (38) is wound, and a third winding portion (36) around which a third winding (39) is wound. The first winding portion (34a, 34b) is arranged between the second winding portion (35) and the third winding portion (36) along the axial direction of the skeleton (20), and a common lead portion (38a) on one side of the second winding (38) and a common lead portion (39a) on one side of the third winding (39) are connected via a common terminal (80).

Description

[0001] This application is filed on September 7, 2018 、Application No. 201811043464.5 、The name of the invention is Coil Pack Place A divisional application for a patent application. Technical Field

[0002] The present invention relates to a coil device such as a transformer used as a leakage transformer or the like. Background Art

[0003] For example, in the transformer shown in Patent Document 1 below, a structure is proposed in which the secondary winding wire is wound around the terminal pin in the middle of the winding to serve as an intermediate tap. However, in this structure, when the wire diameter of the winding wire constituting the secondary winding is large, it becomes difficult to wind around the terminal pin, and it is difficult to use the terminal pin as an intermediate tap. In addition, in the conventional transformer, it is difficult to stabilize the leakage characteristics.

[0004] In addition, as shown in Patent Document 2, a transformer in which a primary winding is sandwiched by a flat coil is also known. However, in this transformer, since a flat coil is used, there is a technical problem that it is difficult to increase the number of turns. In addition, in order to form a center tap, the flat lead portion of the flat coil blocks the opening of the frame, which also causes a technical problem that heat dissipation is poor.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Utility Model Application Laid-Open No. 05-48315

[0008] Patent Document 2: Japanese Patent Application Publication No. 2005-5386 Summary of the invention

[0009] The present invention has been made in view of such actual circumstances, and an object of the present invention is to provide a coil device that can easily stabilize leakage characteristics, easily form an intermediate tap, easily control the number of windings, and also exhibit excellent heat dissipation.

[0010] In order to achieve the above-mentioned purpose, the coil device involved in the present invention is characterized in that it is a coil device with a skeleton, and the skeleton has: a first winding part, on which the first winding is wound; a second winding part, on which the second winding is wound at a position different from the first winding part in the axial direction; a third winding part, on which the third winding is wound at a position different from the first winding part and the second winding part in the axial direction; along the axial direction of the skeleton, the first winding part is arranged between the second winding part and the third winding part, and the common lead part of one side of the second winding and the common lead part of one side of the third winding are connected via a common terminal.

[0011] In the coil device involved in the present invention, the first winding part is arranged between the second winding part and the third winding part along the axial direction of the skeleton, and the second winding and the third winding are connected with a common terminal. For example, if the first winding is set as the primary side coil and the second winding and the third winding are set as the secondary side coil, the primary side coil is clamped by the secondary side coil in the axial direction. Therefore, the leakage characteristics become stable. In addition, the same is true even when the first winding is set as the secondary side coil and the second winding and the third winding are set as the primary side coil.

[0012] Furthermore, the common terminal is different from the terminal pin and can easily fix and connect the common lead portion of one side of the second winding and the common lead portion of one side of the third winding. For example, by providing a rivet portion for wiring on the common terminal, the common lead portion of one side of the second winding and the common lead portion of one side of the third winding can be easily fixed and connected even when the wire diameters of these windings are thick.

[0013] In addition, in the coil device of the present invention, since the coil is formed of a winding wire rather than a flat coil, the number of turns can be easily controlled and excellent heat dissipation is also exhibited.

[0014] Preferably, the common terminal has at least a pair of connection parts to which the common lead parts are respectively fixed, and a fixing part fixed to the terminal block of the frame. With such a configuration, the connection of the common lead parts becomes easy and the fixing of the common terminal to the frame becomes easy.

[0015] Preferably, the fixing portion of the common terminal has a fitting piece that fits into a fitting hole of the frame, and a projection for preventing falling out is formed on the fitting piece. With such a configuration, the fixing of the common terminal to the frame becomes easier.

[0016] Preferably, the fixing portion is formed between the pair of the connecting portions. With this configuration, the common lead portion can be easily connected to the common terminal of the frame and can be easily fixed thereto.

[0017] Preferably, the common terminal is provided at the upper portion along the axial direction of the frame. With such a configuration, the common lead portion can be easily connected and the common terminal can be easily fixed to the frame.

[0018] Preferably, the first winding is wound around the first winding portion of the bobbin by α. This configuration also contributes to a reduction in thickness of the coil device.

[0019] Preferably, a pair of first lead portions of the first winding are respectively connected to a pair of first terminals, the second lead portion on the opposite side of the common lead portion of the second winding is connected to the second terminal, and the third lead portion on the opposite side of the common lead portion of the third winding is connected to the third terminal. A pair of the first terminals are fixed to a first terminal block arranged at the upper part along the axial direction of the skeleton, and the common terminal, the second terminal, and the third terminal are fixed to a second terminal block arranged at the upper part along the axial direction of the skeleton and at the end on the opposite side of the first terminal block.

[0020] By configuring in this way, the wiring of all lead parts becomes easy and the fixing of all terminals to the frame becomes easy. In addition, it also contributes to the thinning of the coil device. In addition, the insulation between all terminals also becomes easy.

[0021] Preferably, the common terminal is disposed between the second terminal and the third terminal on the second terminal block. With this configuration, connection to an external circuit from the common terminal, the second terminal, and the third terminal becomes easy, and this contributes to compactness of the coil device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1A It is a perspective view of a coil device according to one embodiment of the present invention.

[0023] Figure 1B Observe from different angles Figure 1A A perspective view of the coil arrangement shown.

[0024] Figure 2 yes Figure 1A An exploded perspective view of the coil device shown.

[0025] Figure 3A Yes means Figure 2 An exploded perspective view showing the relationship between the windings and the terminals.

[0026] Figure 3B yes Figure 2 An enlarged perspective view of the common terminal is shown.

[0027] Figure 4 It is along Figure 1A A cross-sectional view of the coil device taken along line IV-IV is shown.

[0028] Figure 5 It is along Figure 1A A cross-sectional view of the coil device taken along line VV is shown.

[0029] Figure 6 It is along Figure 1A A cross-sectional view of the coil device taken along line VI-VI is shown.

[0030] Fig. 7A yes Figure 2 An enlarged stereogram of the skeleton represented.

[0031] Figure 7B A different perspective Fig. 7A A stereogram of the skeleton represented.

[0032] Figure 8 It is the circuit diagram of the coil device.

[0033] Explanation of symbols

[0034] 10… Transformer (coil device)

[0035] 20…Skeleton

[0036] 22,23…Terminal block

[0037] 22a, 22b, 23a, 23b1, 23b2…Terminal mounting portion

[0038] 22c, 22d, 23c1, 23c2, 23d1, 23d2…lead groove

[0039] 22e, 22f, 23e, 23f1, 23f2…Matching holes

[0040] 22g, 22h…Nut embedding hole

[0041] 22α, 23α…Insulation protrusions

[0042] 24…Skeleton body

[0043] 26…Through hole for stem

[0044] 28…Winding drum

[0045] 30…Insulating partition flange

[0046] 31,32…End partition flange

[0047] 33…Wrapping the partition flange

[0048] 34a, 34b…first winding drum portion

[0049] 35…Second winding drum

[0050] 36…3rd winding drum portion

[0051] 37…1st winding

[0052] 37a, 37b…1st lead portion

[0053] 38…2nd winding

[0054] 38a…Common lead part

[0055] 38b…Second lead portion

[0056] 39…3rd winding

[0057] 39a…Common lead part

[0058] 39b…3rd lead part

[0059] 40a, 40b…Magnetic core

[0060] 44a,44b…base

[0061] 46a, 46b…middle column

[0062] 48a, 48b…Side column

[0063] 50…Hood

[0064] 52…Hood body

[0065] 54…Snap-on piece

[0066] 56…Jim column guide

[0067] 60…Strip components

[0068] 70a, 70b…Terminal 1

[0069] 80…Common terminal

[0070] 82…Fixer (fixed part)

[0071] 84…Chimera

[0072] 85…Protrusion for preventing falling off

[0073] 86…Connection hook (connection part)

[0074] 88…External connector

[0075] 90a…Terminal 2

[0076] 90b…Terminal 3. DETAILED DESCRIPTION

[0077] Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

[0078] As Figure 1A as well as Figure 1B The transformer 10 of the coil device according to the embodiment shown is used as a leakage transformer in a vehicle such as a car. The transformer 10 includes a bobbin 20 , magnetic cores 40 a and 40 b , a cover 50 , and a tape-shaped member 60 .

[0079] like Figure 2 As shown, the skeleton 20 has a skeleton body 24, a first terminal block 22 and a second terminal block 23 integrally formed at both ends of the skeleton body 24 in the X-axis direction and at the upper part in the Z-axis direction. On the first terminal block 22, terminal mounting portions 22a and 22b are formed at both ends in the Y-axis direction, and the first terminal 70a and the second terminal 70b are mounted on the portions. The first winding 37 ( Figure 3A ) at both ends, namely a pair of first lead portions 37a and 37b, are connected to respective terminals 70a, 70b.

[0080] Each terminal 70a, 70b is made of a metal plate such as tough steel or brass that has excellent electrical conductivity. Figure 3A As shown, each terminal 70a, 70b has a plate-shaped fixing piece 72a, 72b.

[0081] The fixing plates 72a, 72b are respectively installed on Figure 2 The terminal mounting parts 22a, 22b are shown. Figure 3A As shown, in this embodiment, each engaging piece 74a, 74b is integrally formed with the fixing piece 72a, 72b, and the engaging piece 74a, 74b is engaged with the fixing piece 72a, 72b. Figure 7B The terminals 70a and 70b are mounted on the mounting portions 22a and 22b, respectively, in the fitting holes 22e and 22f of the terminal mounting portions 22a and 22b. Figure 3B The engaging piece 84 shown may also be formed with a projection 85 for preventing it from falling off.

[0082] In addition, the wiring hook pieces 76a, 76b are respectively formed integrally with Figure 3A The first lead portions 37a and 37b are fastened and connected to the respective connecting hook pieces 76a and 76b by caulking. Examples of the means for connection include heat welding, soldering, and the like.

[0083] Also, in Figure 7B The terminal mounting portions 22a and 22b shown in the figure are respectively formed with nut embedding holes 22g and 22h, and nut embedding holes 22g and 22h are respectively formed in them. Figure 2 The nuts shown in the figure are detachably mounted on the embedded nuts, and connection with the external terminal is possible.

[0084] On the second terminal block 23, the common terminal mounting portion 23a is arranged at the center of the Y-axis direction. The common terminal mounting portion 23a is mounted with a common terminal 80. The second winding 38 ( Figure 3A) of the common lead portion 38a and the third winding 39 ( Figure 3A ) of the common lead portion 39a. In addition, the terminal mounting portions 23b1 and 23b2 are formed at both ends of the second terminal block 23 in the Y-axis direction, and the second terminal 90a and the third terminal 90b are mounted on each portion. The second lead wire 38 (described later) is connected to each terminal 90a and 90b. Figure 3A ) of the second lead portion 38b and the third winding 39 ( Figure 3A )'s third lead portion 39b.

[0085] The common terminal 80, the second terminal 90a, and the third terminal 90b are formed of, for example, a metal plate having excellent electrical conductivity, similarly to the terminals 70a and 70b. Figure 3A As shown, the common terminal 80 has a plate-shaped fixing piece 82 .

[0086] The fixing plate 82 is mounted on Figure 2 The terminal mounting portion 23a is shown. Figure 3A In this embodiment, a through hole is formed in the central portion of the fixing plate 82. Figure 3B As shown in FIG. 1 , the engaging pieces 84, 84 protruding downward in the Z-axis direction are integrally formed on both sides of the through hole in the X-axis direction, and the engaging pieces 84, 84 are engaged with the through hole. Fig. 7A The terminal 80 is mounted on the mounting portion 23a by inserting the terminal 80 into the fitting hole 23e of the terminal mounting portion 23a. In addition, the fitting pieces 84, 84 may be provided with protrusions 85 for preventing the terminal 80 from falling off on both sides.

[0087] In addition, the wiring hook pieces 86, 86 are integrally formed on Figure 3A The ends of the second winding 38, i.e., the common lead portion 38a, and the ends of the third winding 39, i.e., the common lead portion 38b, are rivet-fastened and connected to the respective connection hooks 86, 86. The means for connection are the same as those for the connection hooks 76a, 76b.

[0088] The external connection piece 88 is integrally formed on the outer side of the fixing piece 82 in the X-axis direction (in the direction away from the axis of the coil). Figure 5 As shown, the terminal block 23 protrudes outward from the frame 20 and can be connected to an external connection terminal.

[0089] like Figure 3A As shown in FIG. 1 , each terminal 90a, 90b has a plate-shaped fixing piece 92a, 92b. The fixing pieces 92a, 92b are respectively mounted on Figure 2In the present embodiment, the engaging pieces 94a, 94b are integrally formed with the fixing pieces 92a, 92b, respectively, and the engaging pieces 94a, 94b are engaged with the fixing pieces 92a, 92b. Fig. 7A The terminals 90a and 90b are respectively mounted on the mounting portions 23b1 and 23b2 in the fitting holes 23f1 and 23f2 of the terminal mounting portions 23b1 and 23b2. Figure 3B Similar to the illustrated engaging piece 84, the anti-drop protrusions 85 may be formed on both side portions of the engaging pieces 94a, 94b.

[0090] In addition, the wiring hook pieces 96a, 96b are integrally formed on Figure 3A The other end of the second winding 38, i.e., the second lead portion 38b, and the other end of the third winding 39, i.e., the third lead portion 39b, are riveted and fastened to the respective connection hook pieces 96a, 96b. The means for connection is the same as that of the connection hook pieces 76a, 76b.

[0091] In addition, the external connection pieces 98a, 98b are integrally formed on the outside of the fixing pieces 92a, 92b in the X-axis direction (in the direction away from the axis of the coil). Figure 5 The external connection piece 88 of the common terminal 80 shown is the same, protrudes outward from the terminal block 23 of the frame 20, and can be connected to the external connection terminal.

[0092] like Figure 7B As shown, an upper guide in the Z-axis direction is formed in the central portion of the first terminal block 22 in the Y-axis direction. Figure 3B The lead grooves 22c and 22d of the first lead parts 37a and 37b are shown. The lead grooves 22c and 22d are provided in the terminal mounting parts 22a and 22b, respectively, and insulation between them is ensured by the insulating protrusions 22α.

[0093] like Fig. 7A As shown, it is guided upward in the Z-axis direction. Figure 3A The lead grooves 23c1 and 23c2 of the common lead portions 38a and 39a shown are formed at both ends in the Y-axis direction of the common terminal mounting portion 23a provided in the center portion in the Y-axis direction of the second terminal block 23. These lead grooves 23c1 and 23c2 are separated by a predetermined width in the Y-axis direction. Figure 3A The lead grooves 23 d 1 and 23 d 2 of the second lead portion 38 b and the third lead portion 39 b shown are formed in terminal mounting portions 23 b 1 and 23 b 2 provided at both ends of the second terminal block 23 in the Y-axis direction.

[0094] An insulating protrusion 23α is provided between the lead groove 23c1 of the common terminal mounting portion 23a and the lead groove 213d1 of the second terminal mounting portion 23b1, and insulation between them is ensured. In addition, an insulating protrusion 23α is provided between the lead groove 23c2 of the common terminal mounting portion 23a and the lead groove 213d2 of the third terminal mounting portion 23b2, and insulation between them is ensured.

[0095] Figure 2 The magnetic cores 40a and 40b shown in the present embodiment are each a single core, but in another embodiment, they can also be separated into two split cores having the same shape. In the present embodiment, all the magnetic cores 40a and 40b have the same shape and have an E-shaped cross section in the ZY cross section, which is a type of E-type core. The other magnetic cores 40a and 40b arranged at the lower part in the Z-axis direction also have an E-shaped cross section in the ZY cross section, constituting a so-called E-type core.

[0096] Each magnetic core 40a arranged on the upper side in the Z-axis direction has a base 44a extending in the Y-axis direction, a pair of side pillars 48a protruding from both ends of the base 44a in the Y-axis direction toward the Z-axis direction, and a center pillar 46a protruding from the center of the base 44a in the Y-axis direction toward the Z-axis direction. The magnetic core 40b arranged on the lower side in the Z-axis direction has a base 44b extending in the Y-axis direction, a pair of side pillars 48b protruding from both ends of the base 44b in the Y-axis direction toward the Z-axis direction, and a center pillar 46b protruding from the center of the base 44b in the Y-axis direction toward the Z-axis direction.

[0097] like Figure 4 As shown, the center column portion 46a is inserted from the upper side in the Z-axis direction into the interior of the through hole 26 for the core column of the skeleton 20. Similarly, the center column portion 46b is inserted from the lower side in the Z-axis direction into the interior of the through hole 26 for the core column of the skeleton 20, and their front ends are configured to contact with the front end of the center column portion 46a or to face each other with a predetermined gap inside the through hole 26.

[0098] The middle column parts 42a, 42b have a cylindrical shape in a manner consistent with the inner peripheral surface shape of the through hole 26, but the shape is not particularly limited and can be changed in accordance with the shape of the through hole 26. In addition, the side column parts 48a, 48b have an inner concave curved surface shape that matches the outer peripheral surface shape of the cover body 52 in the cover 50, and the outer surface of the side column parts 48a, 48b has a plane parallel to the XZ plane. In this embodiment, the material of each core 40a, 40b can be a soft magnetic material such as metal, ferrite, etc., but is not particularly limited.

[0099] Figure 2The cover body 52 of the cover 50 shown has a shape that covers the outer periphery of the skeleton body 24 located between the terminal blocks 22 and 23 in the skeleton 20. The locking pieces 54 that are bent in a substantially vertical direction from the cover body 52 toward the skeleton body 24 are integrally formed at both ends of the cover body 52 in the Z-axis direction. A pair of locking pieces 54 formed on both sides of the cover body 52 in the Z-axis direction are installed in a manner that sandwiches the upper and lower surfaces of the skeleton 24 in the Z-axis direction. A convex locking portion is formed on the upper surface of the skeleton body 24, and can be freely mounted and dismounted in a hook-shaped locking portion formed on the inner side of the locking piece 54 on the upper side of the cover 50.

[0100] In addition, side column guide pieces 56 extending in the Z-axis direction are integrally formed on both end outer surfaces in the X-axis direction of the cover body 52. ​​The inner surfaces of the side column portions 48a, 48b contact the outer surface of the cover body 52 located between the pair of side column guide pieces 56, and the movement of the side column portions 48a, 48b in the X-axis direction is restricted by the pair of side column guide pieces 56.

[0101] In the drawings, the X-axis, the Y-axis, and the Z-axis are perpendicular to each other, and the Z-axis coincides with the winding axes of the first winding 37 and the second winding 38 described later, and corresponds to the height (thickness) of the transformer 10. In the present embodiment, the lower side of the transformer 10 in the Z-axis direction becomes the installation surface of the transformer. In addition, the Y-axis coincides with the long side direction of the first terminal block 23. Furthermore, the X-axis coincides with the direction in which the first terminal block 22 and the second terminal block 23 are arranged.

[0102] like Figure 4 as well as Figure 5 As shown, the end partition wall flanges 31 and 32 are integrally formed at both ends of the winding drum portion (winding portion) 28 of the bobbin 20 in the transformer 10 of this embodiment in the Z-axis direction in a manner extending radially outward and approximately parallel to the XY plane. The first winding drum portion 34a, 34b, the second winding drum portion 35, and the third winding drum portion 36 are continuously formed at different positions in the Z-axis direction on the winding drum portion 28 located between the end partition wall flanges 31 and 32 in the Z-axis direction.

[0103] The first winding drum portion 34a, 34b is located in the center of the winding drum portion 28 in the Z-axis direction and is divided into two sections S1, S2 by the winding partition flange 33. However, each section S1, S2 is formed by Figure 6 The flange 33 is connected by a connecting groove 33a in a circumferential direction of the flange 33. Therefore, the same first winding 37 is wound around the first winding barrel 34a, 34b in each section S1, S2 through the connecting groove 33a to form a primary coil (or secondary coil).

[0104] The connection groove 33a is preferably formed to a depth reaching the outer peripheral wall of the winding drum 28. With this configuration, the first winding 37 can be α-wound across the two sections S1 and S2 through the connection groove 33a. The first winding 37 can also be wound normally.

[0105] In addition, the second winding drum portion 35 located below the first winding drum portions 34a, 34b in the Z-axis direction is wound with the second winding wire 38 to form a secondary coil (or a primary coil). Furthermore, the third winding drum portion 36 located above the first winding drum portions 34a, 34b in the Z-axis direction is wound with the third winding wire 39 to form a secondary coil (or a primary coil).

[0106] like Figure 3A As shown in FIG. 1 , one end of the second winding 38, namely the common lead portion 38a, and one end of the third winding 39, namely the common lead portion 39a, are electrically connected via a common terminal 80. The common terminal 80 is as shown in FIG. Figure 8 As shown, the second winding 38 and the third winding 39 can function as a middle tap, and the second winding 38 and the third winding 39 can constitute a secondary coil (or a primary coil) as a single winding, and only any winding 38, 39 can constitute a secondary coil (or a primary coil). The second winding 38 and the third winding 39 are normally wound in this embodiment, but can also be set to α winding.

[0107] like Figure 4 As shown, in this embodiment, an insulating partition flange 30a substantially parallel to the XY plane is formed on the outer periphery of the winding drum portion 28 located between the first winding drum portion 34a and the second winding drum portion 35. In addition, an insulating partition flange 30b substantially parallel to the XY plane is formed on the outer periphery of the winding drum portion 28 located between the first winding drum portion 34a and the third winding drum portion 36.

[0108] Since these insulating partition flanges 30a, 30b are required to have high insulation, the thickness in the Z-axis direction is greater than that of the winding partition flange 33. In addition, the first winding barrel 34a, 34b is divided into two or more sections S1, S2, but it can also be a single section. The Z-axis height of each section S1, S2 is preferably within the range of 1 to 2 times the wire diameter of the first winding 37.

[0109] The height of the second winding drum 35 in the Z-axis direction is preferably approximately the same as the height of the third winding drum 36 in the Z-axis direction, but may be different, and each height is preferably within the range of 1 to 2 times the wire diameter of the second winding 38 or the third winding 39. In addition, flanges identical to the winding partition wall flanges 33 (with connecting grooves 33a) may be provided on each drum 35 and 36 and divided into a plurality of sections. In this case, the height of each section is preferably within the above range.

[0110] Also, unlike the winding partition wall flange 33, no connection grooves are formed on the insulating partition wall flanges 30a, 30b and the end partition wall flanges 31 and 32, but shallow lead grooves (omitted in the figure) can be formed to guide the lead parts 37a, 37b, 38a, 38b, 39a, 39b to the upper side in the Z-axis direction.

[0111] The radial width of the partition wall flanges 30a, 30b, 31, 32 is set to a width that allows one (one turn or more) winding wires 37 to 39 to enter, and in this embodiment, it is preferably set to a radial width that allows 2 to 4 turns of winding wire to be wound. The radial widths of the partition wall flanges 30a, 30b, 31, 32 are preferably all the same, but may be different.

[0112] In the present embodiment, the frame is made of plastic such as PPS, PET, PBT, or LCP, but may be made of other insulating members. In addition, the cover 50 is made of the same insulating member as the frame 20, such as plastic.

[0113] Next, α winding is described. α winding itself is known as a winding method for forming a coil, but in this embodiment, α winding is performed using the winding partition flange 33 having the connection groove 33a. For example, Figure 4 As shown, in order to α-wind the first winding 38 between the partition wall flanges 30a and 30b, first, the central portion of the winding 37 located substantially in the center between the lead portions 37a and 37b is passed through the connection groove 34a.

[0114] Then, a portion of the winding 37 near the lead portion 37a is Figure 4 The interior of the indicated section S1 is, for example, wound counterclockwise in multiple layers around the outer periphery of the first winding barrel portion 34a. At the same time, another portion of the winding 37 on one side close to the lead portion 37b is wound in multiple layers around the outer periphery of the first winding barrel portion 34b in the interior of the section S2 in the opposite direction (or the same direction) as the winding in the section S1.

[0115] These operations can also be performed using an automatic winding machine. In addition, the windings 37 to 39 can be composed of single wires or twisted wires, and are preferably composed of insulated coated wires. The outer diameter of the windings 37 to 39 is not particularly limited, but when a large current flows, it is, for example, φ3.0 mm or more, preferably φ3.5 to φ5.0 mm. The outer diameter of the second winding 38 can also be the same as the outer diameter of the first winding 37, but it can also be different. In addition, the third winding 39 is connected to the second winding 38 via a common terminal 80, and their outer diameters are preferably the same, but they can also be different.

[0116] After the windings 37 to 39 are respectively wound around the frame 20, as shown in FIG. Figure 2 As shown, the pair of covers 50 are mounted on the frame 20. Then, the center column portions 46a, 46b of the pair of cores 40a, 40b separated in the Z-axis direction are inserted from both sides of the core column through hole 26 in the X-axis direction.

[0117] The results, such as Figure 4 As shown, the front ends of the column parts 46a and 46b in the Z-axis direction are butted against each other inside the through hole 26. The front ends of the column parts 46a and 46b in the Z-axis direction may be in direct contact with each other, or may be opposite to each other with a predetermined gap. In any case, the column parts 46a and 46b of the separable magnetic core are inserted into the through hole 26 to form a magnetic circuit.

[0118] 1, the outer peripheries of the magnetic cores 40a, 40b are covered with the belt-shaped member 60, and the cores 40a, 40b are fixed to the bobbin 20 so as not to be separated. The belt-shaped member 60 is made of a material such as PET, PPS, or paper.

[0119] In the case where the strip-shaped member 60 is also provided with heat dissipation properties, the strip-shaped member 60 is preferably made of a material having a higher thermal conductivity than the magnetic cores 40a and 40b. Specifically, it is preferably made of a material having a higher thermal conductivity such as a metal such as aluminum or copper, or an alloy thereof. Of course, a strip-shaped member made of the above-mentioned various materials may be used in combination as the strip-shaped member 60. In addition, the wiring process of each lead portion 37a, 37b, 38a, 38b, 39a, 39b to each terminal 70a, 70b, 80, 90a, 90b is performed after any process after the winding operation is completed.

[0120] In the transformer 10 according to the present embodiment, the insulating spacer flange 30a is formed on the outer periphery of the winding drum portion 28 located between the first winding drum portion 34a and the second winding drum portion 35, and the insulating spacer flange 30a insulates the primary coil and the secondary coil and exhibits excellent insulation. In addition, the insulating spacer flange 30b is formed on the outer periphery of the winding drum portion 28 located between the first winding drum portion 34a and the third winding drum portion 36, and the insulating spacer flange 30b insulates the primary coil and the secondary coil and exhibits excellent insulation. In addition, even if the thickness of these insulating spacer flanges 30a and 30b is adjusted, the leakage characteristics can be adjusted, and the adjustment is easy.

[0121] Furthermore, in the transformer 10 of the present embodiment, since at least one connection groove 33a for connecting the adjacent sections S1 and S2 to each other is formed in the winding partition wall flange 33, it is easy to perform α-winding of at least the first winding 37 on the first winding barrel portions 34a and 34b via the connection groove 33a. In addition, α-winding can reduce the number of layers in the winding axis direction even if the number of windings is increased, which contributes to the miniaturization of the transformer 10.

[0122] In the transformer 10 according to the present embodiment, Figure 4 As shown, along the axial direction (Z-axis direction) of the skeleton 20, the first winding portion 34a, 34b is arranged between the second winding portion 35 and the third winding portion 36, and the second winding 35 and the third winding 36 are formed by Figure 3A The primary coil is connected to the common terminal 80 shown. For example, if the first winding 37 is set as the primary coil and the second winding 38 and the third winding 39 are set as the secondary coil, the primary coil is sandwiched by the secondary coil in the axial direction. Therefore, the leakage characteristic becomes stable. In addition, the same is true even when the first winding 37 is set as the secondary coil and the second winding 38 and the third winding 39 are set as the primary coil.

[0123] Furthermore, the common terminal 80 is different from the terminal pin and can easily fix and connect the common lead portion 38a of one side of the second winding 38 and the common lead portion 39a of one side of the third winding 39. For example, by providing the connection hook pieces 86, 86 and the like on the common terminal 80, the common lead portion 38a of one side of the second winding 38 and the common lead portion 39a of one side of the third winding 39 can be easily fixed and connected even when the wire diameters of these windings 38, 39 are thick.

[0124] In the transformer 10 of the present embodiment, since the coil is formed by the windings 37 to 39 instead of a flat coil, the number of turns can be easily controlled and excellent heat dissipation is also achieved.

[0125] Furthermore, the common terminal 80 has at least a pair of connection hook pieces 86 to which the common lead portions 38a, 39a are respectively fixed, and a fixing piece 82 fixed to the terminal block 23 of the frame 20. Therefore, the connection of the common lead portions 38a, 39a becomes easy and the fixing of the common terminal 80 to the terminal block 23 of the frame 20 becomes easy.

[0126] In addition, if Figure 3B As shown, the fixing piece 82 of the common terminal 80 has a structure that fits into Fig. 7A The fitting piece 84 of the fitting hole 23e of the frame 20 shown in the figure has a projection 85 for preventing the falling out formed on the fitting piece 84. Therefore, the fixing of the common terminal 80 to the terminal block 23 of the frame 20 becomes easier.

[0127] Furthermore, the fixing piece 82 is formed between a pair of hook pieces 86 for wiring. Figure 3A The common lead portions 38 a and 39 a shown are easily connected to each other and the common terminal 80 is easily fixed to the terminal block 23 of the frame 20 .

[0128] In addition, the common terminal 80 is provided at the upper portion along the Z-axis direction of the frame 20. Therefore, the connection of the common lead portions 38a and 39a is facilitated and the fixing of the common terminal 80 to the terminal block 23 of the frame 20 is facilitated.

[0129] Furthermore, the first winding 37 is as follows Figure 4 As shown, the first winding portions 34a and 34b are α-wound around the bobbin 20. Therefore, it also contributes to the thinning of the transformer 10 in the Z-axis direction. The second winding 38 and the third winding 39 may also be α-wound.

[0130] In this embodiment, if Figure 3A As shown, a pair of first lead portions 37a, 37b of the first winding 38 are connected to a pair of first terminals 70a, 70b, respectively. A second lead portion 38b on the opposite side of the common lead portion 38a of the second winding 38 is connected to a second terminal 90a. A third lead portion 39b on the opposite side of the common lead portion 39a of the third winding 39 is connected to a third terminal 90b.

[0131] A pair of first terminals 70a, 70b are as follows Figure 1B As shown, the first terminal block 22 is fixed to the upper portion along the Z-axis direction of the frame 20. Figure 1A As shown, the common terminal 80 , the second terminal 90 a and the third terminal 90 b are fixed to the second terminal block 23 which is provided at the upper portion along the axial direction of the frame 20 and at the end portion on the opposite side of the first terminal block 22 in the X-axis direction.

[0132] By constructing in this way, Figure 3AThe wiring of all the lead parts 37a, 37b, 38a, 38b, 39a, 39b shown is easy and relatively Figure 2 The fixing of all the terminals 70a, 70b, 80, 90a, 90b of the shown bobbin 20 becomes easy, and this also contributes to the thinning of the transformer 10. In addition, the insulation between all the terminals 70a, 70b, 80, 90a, 90b also becomes easy.

[0133] In addition, the common terminal 80 is disposed between the second terminal 90a and the third terminal 90b on the second terminal block 23. Therefore, connection to an external circuit from the common terminal 80, the second terminal 90a, and the third terminal 90b is facilitated, and the transformer 10 can be made more compact.

[0134] In addition, the present invention is not limited to the above-mentioned embodiment, and various changes can be made within the scope of the present invention.

[0135] For example, in the transformer 10 of the present embodiment, at least the lower portion along the winding axis (Z axis) direction of the transformer 10 may be housed in a housing (not shown) and in contact with a heat dissipation resin (potting resin). The heat dissipation of the center column portions 46a, 46b is further improved by contacting with the heat dissipation resin.

Claims

1. A coil device, characterized in that: It is a coil device with a skeleton. The skeleton has: a first winding portion, on which a first winding wire is wound; a second winding portion on which a second winding is wound at a position different in the axial direction from that of the first winding portion; and The third winding portion is wound at a position different from the first winding portion and the second winding portion in the axial direction. Along the axial direction of the frame, the first winding portion is arranged between the second winding portion and the third winding portion, One common lead portion of the second winding and one common lead portion of the third winding are connected via a common terminal. A terminal block fixedly connected to the common terminal of the pair of common lead parts is formed at an upper portion of the frame along the axial direction. The terminal block is provided with a pair of lead grooves for guiding the common lead portions toward the upper part in the axial direction. A common terminal mounting portion for mounting a fixing portion of the common terminal is disposed between the pair of lead grooves. The common terminal has hooks at both ends thereof that are bent along the pair of lead wire grooves. The common terminal mounting portion has a pair of fitting holes formed in a direction substantially perpendicular to a direction in which the pair of lead wire grooves are formed. The fixing piece of the common terminal has a pair of engaging pieces. Each of the pair of fitting pieces enters each of the pair of fitting holes of the common terminal mounting portion.

2. The coil device according to claim 1, characterized in that: The fixing portion is formed between the pair of hook pieces.

3. The coil device according to claim 1 or 2, characterized in that: The common terminal is provided at an upper portion along an axial direction of the frame.

4. The coil device according to claim 1 or 2, characterized in that: The first winding is α-wound around a first winding portion of the bobbin.

5. The coil device according to claim 1 or 2, characterized in that: A pair of first lead portions of the first winding are respectively connected to a pair of first terminals, and a second lead portion of the second winding on the opposite side of the common lead portion is connected to a second terminal. A third lead portion of the third winding on the opposite side of the common lead portion is connected to a third terminal. The pair of first terminals is fixed to a first terminal block provided at an upper portion along an axial direction of the frame. The common terminal, the second terminal, and the third terminal are fixed to a second terminal block provided at an upper portion along an axial direction of the frame and provided at an end portion on an opposite side of the first terminal block.

6. The coil device according to claim 5, characterized in that: On the second terminal block, the common terminal is arranged between the second terminal and the third terminal.

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