CN105590739B - Transformer - Google Patents

Abstract

The divided winding type transformer provided by the present invention can ensure the withstand voltage between the primary winding and the secondary winding, and can make the magnetic coupling become good; the primary winding (30) and the secondary winding ( 40) Arranged in an opposing state in the axial direction; the transformer (1) has a first split coil former (20A) and a second split coil former (20B), and the first split coil former (20A) is arranged in the axial direction There are a plurality of first split reel parts (21) having a reel part (213), and a first fitting recess (25) is provided between adjacent first split reel parts (21). The two-split bobbin (20B) is provided with a plurality of second split reel parts (21) provided with reel parts (213) in the axial direction, and between adjacent second split reel parts (21) A second fitting recess (25) is provided.

Description

transformer

technical field

The present invention relates to transformers.

Background technique

There are various types of transformers that are one type of magnetic elements, and among them, there is a type (laminated type) in which a primary winding and a secondary winding are stacked on the same bobbin portion. In this laminated transformer, since the primary winding and the secondary winding are laminated, the leakage magnetic flux is reduced, and the magnetic coupling between the primary winding and the secondary winding is improved.

On the other hand, as a type different from the above-mentioned type, there is also a divided winding type transformer in which the primary winding and the secondary winding are wound on different bobbins and arranged on the same axis. In this split winding type transformer, since the primary winding and the secondary winding are separated by the flange of the bobbin, a creepage distance can be ensured and high insulation can be ensured.

In addition, as a split-winding type transformer, there is a transformer as disclosed in Patent Document 1, for example. In the configuration shown in Patent Document 1, a configuration is disclosed in which a primary winding is wound in a slot on the outer peripheral side, and a secondary winding is wound on a winding core on the inner peripheral side.

[Prior Art Literature]

【Patent Literature】

Patent Document 1: Japanese Gazette, Patent No. 4239323

However, in order to ensure the creepage distance between the primary winding and the secondary winding in the above-mentioned laminated transformer, it is necessary to provide an insulating barrier tape or the like between the primary winding and the secondary winding. In addition, when the potential difference between the primary winding and the secondary winding becomes large, corona discharge or the like may occur, and there is a possibility of insulation breakdown due to the corona discharge.

On the other hand, in a split-wound transformer, problems such as corona discharge are less likely to occur, but there is a problem that the interlinkage area of magnetic flux becomes small and the coupling is poor.

In addition, in the configuration shown in Patent Document 1, there is a problem that the number of turns of the primary winding is reduced. Furthermore, in the structure shown in Patent Document 1, after winding the electric wire around the winding core on the inner peripheral side to form the secondary winding, the electric wire must be wound in the slot on the outer peripheral side to form the primary winding. This problem is more time-limited.

Contents of the invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a split-winding transformer capable of ensuring a withstand voltage between a primary winding and a secondary winding and enabling good magnetic coupling.

In order to solve the above-mentioned problems, the transformer of the present invention is a transformer in which the primary winding and the secondary winding are arranged to face each other in the axial direction. The transformer is characterized in that it includes a first split bobbin and a second split bobbin. The split bobbin is provided with a plurality of first split drum parts in the axial direction, and a first fitting recess is provided at a predetermined gap between adjacent first split drum parts, wherein the first split drum parts The part has a bobbin part surrounded by a pair of flange parts, the second split bobbin is provided with a plurality of second split bobbin parts in the axial direction, and the regulation between adjacent second split bobbin parts The gap is provided with a second fitting recess, wherein the second split reel part has a bobbin part surrounded by a pair of flange parts; the second split reel part is embedded in the first fitting recess, and the first split reel The barrel portion is fitted into the second fitting recess; the primary winding is continuously arranged on the plurality of first split bobbin portions, and the secondary winding is continuously arranged on the plurality of second split bobbin portions.

In addition, another aspect of the transformer of the present invention is based on the above-mentioned invention, and it is further preferred that a first connecting portion is provided between adjacent first split drum portions, and the first connecting portion connects the adjacent first split drum portions. A split roll portion is connected, and a second connecting portion is provided between adjacent second split roll portions, and the second connecting portion connects the adjacent second split roll portions, and the first connecting portion Wire slots are respectively provided on the first and second connecting parts, and are formed by being recessed from the outer surfaces of the first and second connecting parts, and are used to guide wires constituting the primary winding and the secondary winding.

Furthermore, another aspect of the transformer of the present invention is based on the above-mentioned invention, and further preferably: between any one flange portion of the first split drum portion and the second connection portion abutted by the flange portion, There is a positioning member for positioning the first split bobbin and the second split bobbin through the fitting of concave and convex shapes, and the second split bobbin where any one of the flanges of the second split roll part abuts on the flange is provided. A positioning member for positioning the first split bobbin and the second split bobbin is provided between the first and second connecting parts through fitting of concave and convex shapes.

In addition, another aspect of the transformer of the present invention is based on the above invention, and it is further preferred that the flange part is formed as a support flange part and an auxiliary flange part in a stepped state and is integrally provided, wherein the auxiliary flange part The thickness of the flange portion is smaller than the thickness of the support flange portion, and the support flange portion is located closer to the first connecting portion side than the auxiliary flange portion in the first split roll portion, and the second split roll portion Among the parts, the supporting flange part is located closer to the second connection part side than the auxiliary flange part.

(invention effect)

According to the transformer of the present invention, the withstand voltage between the primary winding and the secondary winding can be ensured, and magnetic coupling can be improved.

Description of drawings

FIG. 1 is a perspective view showing a first configuration example of a fitting-type bobbin for a transformer according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a split bobbin constituting the fitted bobbin shown in Fig. 1 .

3 is a perspective view showing a state in which a primary winding and a secondary winding are taken out from the configuration of FIG. 1 , and is a diagram showing a magnetically coupled state.

FIG. 4 is a perspective view showing a fitting type bobbin 10S according to a second configuration example.

Fig. 5 is a perspective view showing a split bobbin constituting the fitted bobbin shown in Fig. 4 .

Fig. 6 is a side view showing a fitting-type bobbin according to a third configuration example.

Fig. 7 is a side view showing a split bobbin constituting the fitted bobbin shown in Fig. 6 .

FIG. 8 is a perspective view showing the overall configuration of a transformer according to an embodiment of the present invention.

Fig. 9 is a perspective view showing an E-shaped magnetic core constituting the magnetic core body of the transformer shown in Fig. 8 .

(Symbol Description)

1 Transformer 10, 10S, 10T embedded coil former

20 split coil formers

20A, 20AS, 20AT split bobbins (corresponding to an example of the first split bobbin)

20B, 20BS, 20BT split bobbin (corresponding to an example of the second split bobbin)

21 split roll part (corresponding to an example of the first split roll part and the second split roll part)

22 Connecting part (corresponding to an example of the first connecting part and the second connecting part)

22a outer surface 22b inner surface

22c Positioning recess (corresponding to an example of a positioning member)

23 Lower locking part 24 Upper locking part

25 Fitting recess (corresponding to an example of the first fitting recess and the second fitting recess)

30 Primary Winding 40 Secondary Winding

50 terminal block 60 core body

61 E-shaped core 211 Cylindrical part

211a Cylindrical hole 212 Flange

212a outer surface 212b edge portion

212c Positioning protrusion (corresponding to an example of a positioning member)

213 Spool part 214 Support flange part

215 Auxiliary flange 216 Step surface

221 Wire guide 231, 241 Wire guide

232, 242 Trailer 611 Bottom of core

612 core middle leg 612a end face

612 Core Endface W Wire

Detailed ways

Hereinafter, the fitting type bobbin 10 used for the transformer 1 which concerns on one Embodiment of this invention is demonstrated based on drawing. In addition, in the following description, the first to third configuration examples of the fitting-type bobbin 10 will be described first, and then the transformer 1 using the fitting-type bobbin 10 will be described.

In addition, in the following description, the XYZ rectangular coordinate system is sometimes used for description, and the up and down direction in FIG. The upper locking portion 24 side will be described as the upper side (Z1 side). In addition, the axial direction of the fitting type bobbin 10 is set as X direction, and the right side in FIG. In addition, the direction perpendicular to the Z direction and the X direction is referred to as the Y direction, the upper right side in FIG. 1 is referred to as the Y1 side, and the opposite lower left side is referred to as the Y2 side.

<1. About the first configuration example of the fitted bobbin>

FIG. 1 is a perspective view showing a first configuration example of a fitting-type bobbin 10 for a transformer. In addition, FIG. 1 shows a state where the primary winding 30 and the secondary winding 40 are wound around the fitted bobbin 10 . FIG. 2 is a perspective view showing a split bobbin (split bobbin) 20 constituting the fitted bobbin 10 . In addition, FIG. 2 shows the split bobbin 20 around which the primary winding 30 is wound. In addition, the structure of the 1st structural example of the fitting type bobbin 10 is the structure concerning the basic form of the fitting type bobbin 10. As shown in FIG. Therefore, the technical idea about the basic configuration shown in the first configuration example is also included in the second configuration example and the third configuration example described later.

In the following description, the split bobbin 20 on the side where the primary winding 30 is wound is referred to as a split bobbin 20A, and the split bobbin 20 on which the secondary winding 40 is wound is referred to as a split bobbin 20B as necessary, However, when there is no need to distinguish between the two, it is only referred to as split bobbin 20 . In addition, the split bobbin 20A corresponds to the first split bobbin, and the split bobbin 20B corresponds to the second split bobbin.

As shown in FIGS. 1 and 2 , the fitting-type bobbin 10 according to the first configuration example is configured by fitting two split bobbins 20 to each other. Two split bobbins 20 are provided in the same shape. The two split bobbins 20 respectively have a split drum portion 21 , a connecting portion 22 , a lower locking portion 23 , and an upper locking portion 24 .

In addition, the split bobbin part 21 of the split bobbin 20A corresponds to the first split bobbin part, and the split bobbin part 21 of the split bobbin 20B corresponds to the second split bobbin part.

Moreover, in 20 A of split bobbins, the part surrounded by the adjacent split bobbin part 21 and the connection part 22 becomes the fitting recessed part 25 into which the split bobbin part 21 of the split bobbin 20B fits. Similarly, in the split bobbin 20B, the part surrounded by the adjacent split bobbin part 21 and the connection part 22 also becomes the fitting recessed part 25 into which the split bobbin part 21 of the split bobbin 20A fits.

In addition, the fitting recess 25 of the split bobbin 20A corresponds to the first fitting recess, and the fitting recess 25 of the split bobbin 20B corresponds to the second fitting recess.

The split roll portion 21 includes a cylindrical portion 211 having a cylindrical shape with a cylindrical hole 211 a on the inner peripheral side, and a pair of flange portions 212 located on both end sides of the cylindrical portion 211 . Furthermore, a portion surrounded by the cylindrical portion 211 and the pair of flange portions 212 serves as a bobbin portion 213 around which the conductive wire W is wound. In the configuration shown in FIGS. 1 and 2 , each split bobbin 20 includes two split bobbins 21 . Accordingly, the spool portion 213 is provided to be thinned in thickness accordingly. The primary winding 30 or the secondary winding 40 is formed by winding a conductive wire W covered with an insulating film such as enamel on each bobbin portion 213 .

In addition, the connecting portion 22 is a portion for connecting adjacent split roll portions 21 . The fitting type bobbin 10 is comprised by fitting the split bobbin 20A and the split bobbin 20B mutually. Therefore, in the first configuration example, all the connecting portions 22 are positioned below the split roll portion 21 , but a configuration in which all the connecting portions 22 are positioned above the split roll portion 21 may also be adopted. In addition, the connection part 22 of the split bobbin 20A corresponds to the first connection part, and the connection part 22 of the split bobbin 20B corresponds to the second connection part.

As shown in FIG. 1 , a wire slot 221 is disposed on the connecting portion 22 . The wire groove 221 is a groove-shaped portion that guides the wire W toward the other bobbin portion 213 in each of the split bobbins 20A, 20B, respectively, and is recessed from the outer surface 22 a of the connection portion 22 . By providing such a wire groove 221 , the wire W can be positioned, and the wire W can be prevented from jumping out of the outer surface 22 a of the connection portion 22 . In addition, a configuration in which the wire guide 221 is not provided on the connection portion 22 may also be adopted.

The lower locking portion 23 and the upper locking portion 24 are provided in the same shape. However, the lower locking portion 23 and the upper locking portion 24 may be formed in different shapes. The lower locking portion 23 and the upper locking portion 24 function as positioning portions when attaching a magnetic core (not shown). In addition, the connection terminal 50 can be attached to the lower locking part 23 and the upper locking part 24 . For example, insertion holes P may be respectively formed on the lower locking portion 23 and the upper locking portion 24, and the connection terminals 50 may be inserted into the insertion holes P, thereby installing the connection terminals 50 on the lower locking portion 23 and the upper locking portion 23. on the locking part 24 . In the case of inserting the connection terminal 50 into the insertion hole P and attaching it, a detachment prevention part may be provided.

In addition, the method of attaching the connection terminal 50 to the lower locking portion 23 and the upper locking portion 24 is not limited to insertion, and insert molding or the like may be used, for example.

A wire groove 231 and a wire groove 241 are respectively provided on the lower locking portion 23 and the upper locking portion 24 . Therefore, when the connection terminal 50 is attached to the lower locking portion 23 and the upper locking portion 24 , the lead wire W can be guided to the connection terminal 50 .

In addition, the fitting recessed portion 25 is provided between adjacent split roll portions 21 . The split bobbin portion 21 of the other split bobbin 20 is embedded in the fitting recess 25. Therefore, in order to reduce the shaking after the split bobbin portion 21 is fitted into the fitting recess 25, it is preferable that the X direction of the fitting recess 25 The size corresponds to the size between the surface 212 a outside the spool portion 213 of one flange portion 212 and the surface 212 a outside the spool portion 213 of the other flange portion 212 .

Here, the edge portion 212b of the flange portion 212 on the side of the insertion and fitting recess 25 is preferably provided in a linear shape in the width direction (Y direction). When the edge portion 212b is provided in a linear shape in the width direction in this way, when the split roll portion 21 is inserted into the fitting recess 25, the contact between the edge portion 212b and the inner surface 22b of the connection portion 22 can be increased. Width, so that the fitting state can be stabilized. However, the edge portion 212b and the inner surface 22b may also have curved shapes corresponding to each other.

In addition, by abutting the edge portion 212b on the inner surface 22b, the cylindrical hole 211a of the split bobbin 20A and the cylindrical hole 211a of the split bobbin 20B can be satisfactorily communicated, and a post of a magnetic core (not shown) can be inserted. feet.

FIG. 3 is a perspective view showing a state in which the primary winding 30 and the secondary winding 40 are removed from the configuration of FIG. 1 , and is a diagram showing a state of magnetic coupling. As shown in FIG. 3 , when the fitting-type bobbin 10 according to the first configuration example is used, the interlinkage region MF can be increased. That is, in the conventional part-winding type transformer, there is only one interlinkage region, and thus the leakage magnetic flux increases.

However, as is clear from FIG. 3 , in the first configuration example, each split bobbin 20 has two split bobbin portions 21 , and by fitting them together, a total of three interlinking regions exist. Therefore, the overall interlinkage area can be increased. Therefore, leakage magnetic flux in which only the primary winding 30 interlinks or only the secondary winding 40 interlinks is reduced, and the magnetic coupling between the primary winding 30 and the secondary winding 40 can be improved.

In addition, in the structure shown in FIG. 1 and FIG. 2, the primary winding 30 and the secondary winding 40 are separated by the flange portion 212 as in the conventional split-winding type transformer, so the creepage distance can be ensured, thereby High insulation can be ensured. That is, by providing the flange part 212, the pressure resistance between the primary winding 30 and the secondary winding 40 can be ensured.

In addition, the connecting portion 22 is provided with a wire groove 221 recessed from the outer surface 22a thereof. Therefore, the lead wire W can be positioned, and the lead wire W can be prevented from jumping out of the outer surface 22 a of the connection portion 22 .

<2. About the second configuration example of the fitted bobbin>

FIG. 4 is a perspective view showing a fitting type bobbin 10 according to a second configuration example. FIG. 5 is a perspective view showing a split bobbin 20 constituting the fitted bobbin 10 shown in FIG. 4 . In addition, in the following description, although the fitting-type bobbin 10 which concerns on a 2nd structural example is called a fitting-type bobbin 10S as needed, it may only be called a fitting-type bobbin 10. In addition, the split bobbin 20 shown in FIG. 4 is sometimes referred to as a split bobbin 20S as necessary, and the split bobbin corresponding to the split bobbin 20A of FIG. 1 is sometimes called a split bobbin 20AS, but sometimes Also referred to simply as split bobbin 20A. Similarly, although the split bobbin corresponding to the split bobbin 20B of FIG. 1 may be called split bobbin 20BS, it may only be called split bobbin 20B.

As shown in FIGS. 4 and 5 , in the fitting-type bobbin 10S according to the second configuration example, the basic constituent elements are the same as those of the fitting-type bobbin shown in FIGS. 1 and 2 already described, except for the shape. 10 is the same. Therefore, descriptions of the same configurations are omitted.

In addition, in the structure shown in FIG. 4 and FIG. 5, split bobbin 20S has three split bobbin parts 21, respectively. That is, the primary windings 30 are continuously provided on the three split bobbins 21 , and similarly, the secondary windings 40 are also continuously provided on the three split bobbins 21 .

In addition, in the present embodiment, portions other than the upper side and the lower side of the outer peripheral side of the flange portion 212 are provided in an arc shape. That is, the distance from the cylindrical hole 211 a to the outer circumference of the flange portion 212 is set to be constant except for the upper side and the lower side of the flange portion 212 .

In addition, in the structure shown in FIG. 4 and FIG. 5, the edge part 212b of the flange part 212 by the insertion-fitting recessed part 25 side is provided with the positioning protrusion 212c. The positioning protrusion 212 c is a portion inserted into the positioning recess 22 c provided on the inner surface 22 b of the connecting portion 22 . That is, the positioning protrusion 212c of the split bobbin 20AS is inserted into the positioning recess 22c of the split bobbin 20BS, and the positioning protrusion 212c of the split bobbin 20BS is inserted into the positioning recess 22c of the split bobbin 20AS. Therefore, the fitting-type bobbin 10S of the second configuration example is configured such that the positions of the split bobbin 20AS and the split bobbin 20BS in the width direction (Y direction) are also fixed, so that it is difficult to cause a fault in the width direction (Y direction). dislocation.

In addition, the positioning protrusion 212c and the positioning recessed part 22c correspond to the positioning member which performs positioning by fitting of uneven|corrugated shape.

Furthermore, in the configuration shown in FIG. 4 and FIG. 5 , the wire grooves 231 and 241 respectively provided on the lower locking portion 23 and the upper locking portion 24 are formed so as to be opposite to the axial direction of the fitted bobbin 10S. (X direction) The inclined tapered groove is inclined so as to gradually face the exposed surface of the insertion hole P as it moves away from the bobbin portion 213 side. Therefore, when the wire W is introduced into the wire groove 231 and the wire groove 241 , the wire W can be well guided to the connection terminal 50 .

In addition, in the configuration shown in FIGS. 4 and 5 , a stand-off 232 and a stand-off 242 are respectively provided on the lower locking portion 23 and the upper locking portion 24 . The drag feet 232 are provided on both ends in the width direction (Y direction) of the lower locking portion 23 , and similarly, the drag feet 242 are also provided on both ends in the width direction of the upper locking portion 24 . Therefore, when the end of the wire W is bundled to the terminal 50, the bundled portion and the mounting substrate can be separated from each other. In addition, when installing a magnetic core such as an EP magnetic core, the drag legs 232 and 242 can function to position the magnetic core, thereby preventing the magnetic core from being dislocated.

In the above-mentioned configuration, the split bobbin 20AS and the split bobbin 20BS can be accurately positioned by fitting the positioning protrusion 212c and the positioning recessed portion 22c to each other. Therefore, the assemblability of both can be improved. In addition, since the outer peripheral side of the flange portion 212 is provided in an arc shape except for the upper side and the lower side, it is possible to reduce the distance between the central axis of the fitted bobbin 10 and the outer peripheral side of the flange portion 212 except for the upper side. The deviation of the distance between the side and other parts than the lower side. Therefore, when the magnetic core is disposed on the outer peripheral side of the flange portion 212, the leakage magnetic flux can be favorably reduced.

<3. Regarding the third configuration example of the fitted bobbin>

Next, a third configuration example of the fitting type bobbin 10 will be described. FIG. 6 is a side view showing a fitting type bobbin 10T according to a third configuration example. FIG. 7 is a side view showing a split bobbin 20T constituting the fitting type bobbin 10T shown in FIG. 6 .

In addition, in the following description, although the fitting-type bobbin 10 which concerns on the 3rd structural example is called a fitting-type bobbin 10T as needed, it may only be called the fitting-type bobbin 10. In addition, the split bobbin 20 shown in FIG. 7 is sometimes referred to as a split bobbin 20T as necessary, and the split bobbin corresponding to the split bobbin 20A of FIG. 1 is sometimes called a split bobbin 20AT, but sometimes Also referred to simply as split bobbin 20A. Similarly, although the split bobbin corresponding to the split bobbin 20B of FIG. 1 may be called split bobbin 20BT, it may only be called split bobbin 20B.

As shown in FIG. 6 , the form of the flange portion 212 of the fitting type bobbin 10T according to the third configuration example is different. That is, in the configuration shown in FIG. 1 or FIG. 4 , the thickness of the flange portion 212 is the same over the entire circumferential direction of the flange portion 212 . On the other hand, in the flange portion 212 of the third configuration example, the thickness of the flange portion 212 is not provided to be the same over the entire circumference, but varies depending on the location of the flange portion 212 . In the following description, the flange portion 212 of the third configuration example may be referred to as a flange portion 212T, but may be simply referred to as the flange portion 212 .

Specifically, as shown in FIG. 7 , the flange portion 212T is provided with a support flange portion 214 and an auxiliary flange portion 215 . The support flange portion 214 is located closer to the connecting portion 22 side than the auxiliary flange portion 215 , and has a thickness greater than that of the auxiliary flange portion 215 . On the other hand, the auxiliary flange portion 215 is located on a side away from the connecting portion 22 and has a thickness smaller than that of the supporting flange portion 214 .

The support flange portion 214 is a portion connected to the connection portion 22 and the cylindrical portion 211 , and is one of portions constituting the skeleton of the split bobbin 20 . Therefore, the support flange portion 214 needs to have a certain strength, so the thickness of the support flange portion 214 is greater than the thickness of the auxiliary flange portion 215 . That is, the thickness of the supporting flange part 214 is set to be the same thickness as the flange part 212 shown in FIG. 1 or FIG. 4 so as to have sufficient strength.

On the contrary, the auxiliary flange portion 215 is connected to the cylindrical portion 211 but not connected to the connection portion 22 , which does not constitute the skeleton of the split bobbin 20 . Therefore, the auxiliary flange portion 215 does not require high strength, and thus the thickness of the auxiliary flange portion 215 is set to be smaller than the thickness of the supporting flange portion 214 .

By having such a supporting flange portion 214 and an auxiliary flange portion 215 , the flange portion 212T is provided in a stepped shape as shown in FIG. 7 . That is, between the supporting flange portion 214 and the auxiliary flange portion 215 , a stepped surface 216 is formed due to the difference in thickness. When fitting the split bobbin 20AT and the split bobbin 20BT, the stepped surfaces 216 of both are in contact with each other, or face each other with a very small gap therebetween.

In addition, when fitting the split bobbin 20AT and the split bobbin 20BT, as shown in FIG. 6 , the support flange portion 214 and the auxiliary flange portion 215 are adjacent to each other, and at this time, both are preferably in surface contact. In this fitted state, the total thickness of the supporting flange portion 214 and the auxiliary flange portion 215 is smaller than the total thickness of the two adjacent flange portions 212 shown in FIG. 1 or FIG. 4 .

Thus, assuming that the length in the axial direction (X direction) of the fitted bobbin 10 is the same, the dimension in the axial direction (X direction) of the bobbin portion 213 surrounded by the pair of flange portions 212 can be increased. . Accordingly, the number of turns of the conductive wire W on the bobbin portion 213 can be increased.

In addition, since the support flange portion 214 is provided on the connection portion 22 side of the flange portion 212T of the split bobbin 20T, it is possible to prevent the strength of the portion serving as the skeleton of the split bobbin 20T from being damaged. That is, in the third configuration example, although the total thickness of the two adjacent flange portions 212T is reduced, it is possible to prevent the strength of the flange portion 212T from being reduced.

In addition, in the third configuration example, the flange portion 212T connected to both the lower locking portion 23 and the upper locking portion 24 is required to have strength on both sides in the vertical direction, and it is not connected with other flange portions 212T. adjacent. Therefore, the flange portion 212T connected to the lower locking portion 23 and the upper locking portion 24 is provided to have the same thickness over the entire circumference as in the flange portion 212 shown in FIG. 1 or FIG. 4 .

<4. Regarding transformers using fitted bobbins>

Next, the transformer 1 using the fitted bobbin 10 will be described. FIG. 8 is a perspective view showing the overall configuration of the transformer 1 according to the embodiment of the present invention. The transformer 1 shown in FIG. 8 includes a magnetic core body 60 in which two E-shaped magnetic cores 61 are butted together. By abutting two E-shaped magnetic cores 61, a part of E-shaped magnetic core 61 (core end surface 613 described later) is also arranged on the outer peripheral side of primary winding 30 and secondary winding 40, thereby reducing leakage magnetic flux. .

FIG. 9 is a perspective view showing an E-shaped magnetic core 61 constituting the magnetic core body 60 of the transformer 1 shown in FIG. 8 . As shown in FIG. 9 , the E-shaped core 61 has a core bottom 611 , a core middle leg 612 , and a core end surface 613 , and is provided in an E-shape in side view.

The magnetic core bottom 611 is the part with the largest area in the E-shaped magnetic core 61 . In addition, the magnetic core bottom 611 is set to have the largest dimension in its length direction. In addition, since the E-shaped magnetic core 61 is disposed between the lower locking portion 23 and the upper locking portion 24 of the split bobbin 20S shown in FIG. 4 , the longitudinal direction (Y direction) of the magnetic core bottom 611 The central side edge portion of the magnetic core is recessed toward the middle leg portion 612 of the magnetic core. However, when the E-shaped magnetic core is mounted in the split bobbin 20 as shown in FIG. 1 , it is not necessary to form such a recess.

A core middle leg portion 612 is erected on a central portion in the longitudinal direction of the core bottom 611 . The core intermediate leg portion 612 is provided in a cylindrical shape, and the cylindrical core intermediate leg portion 612 is inserted into the cylindrical hole 211 a.

In addition, the core end portions 613 are erected so as to protrude from both ends in the longitudinal direction of the core bottom portion 611 toward the same direction as the core middle leg portion 612 extends. In addition, the inner peripheral wall portion of the core end surface portion 613 is not provided in a planar shape, but is provided in an arc shape such that it faces the core intermediate leg portion 612 . Therefore, a gap having substantially the same radial dimension is provided between the outer periphery of the core middle leg portion 612 and the inner wall of the core end portion 613 . Furthermore, the flange part 212 can be arrange|positioned in this clearance gap.

In addition, after the two E-shaped magnetic cores 61 are butted together, the end faces 612a of the core intermediate leg portions 612 are butted against each other. Regarding this butt joint, the end faces 612a may be directly butted against each other, or the end faces 612a may be butted through spacers that are electrically insulating and are non-magnetic members. In addition, the end faces 612a may face each other with a very small gap therebetween.

In the transformer 1 configured as above, as described above, the withstand voltage between the primary winding 30 and the secondary winding 40 can be ensured, and magnetic coupling can be improved.

<Modification>

An embodiment of the present invention has been described above, but the present invention can be modified in various ways. Hereinafter, this will be described.

In the above-described embodiment, the two split bobbins 20 (the first split bobbin and the second split bobbin) constituting the fitting type bobbin 10 are provided in the same shape. However, the two split bobbins 20 may also be provided in mutually different shapes. For example, when the number of turns of the primary winding 30 is greatly different from the number of turns of the secondary winding 40, correspondingly, the length in the axial direction of the bobbin portion 213 of one of the split bobbins 20 may be increased, The length in the axial direction of the bobbin portion 213 of the other split bobbin 20 is reduced.

In addition, in the above-described embodiment, the pin-type split bobbin 20 having the pin-shaped connection terminal 50 has been described. However, the split bobbin is not limited to the plug type in which the terminal 50 is inserted into a hole such as a through hole of the substrate, but may be a surface mount type in which the terminal is in planar contact with the cream solder coating portion of the substrate. In this case, the connecting terminal may protrude from a side surface corresponding to the lower locking portion of the terminal board, and after passing through a tapered portion, the portion mounted on the substrate is parallel to the surface of the substrate.

In addition, in the above-mentioned embodiment, the E-shaped magnetic core 61 was shown as the magnetic core constituting the magnetic core body 60 . However, the core is not limited to the E-shaped core 61 . For example, cores of various shapes such as drum cores, ring cores, and rod cores can be used.

In addition, in the above-described embodiment, the flange portion 212 may be configured such that a slit extending in the radial direction thereof is provided. Furthermore, the slit can be used for wires or for heat dissipation.

In addition, in the above-described embodiment, the fitting type bobbin 10 is configured by fitting the two split bobbins 20 to each other. However, the fitting type bobbin 10 may be configured by combining three or more split bobbins. When three or more split bobbins are combined to form a fitting type bobbin, magnetic coupling can be further improved.

In addition, in the said embodiment, the fitting-type bobbin 10 was demonstrated as the fitting-type bobbin for transformers. However, the fitting type bobbin 10 is not limited to the transformer application. For example, a fitted bobbin can also be used for an inductor such as a choke coil or a reactor.

Claims (4)

1. A transformer in which a primary winding and a secondary winding are arranged to face each other in the axial direction, The transformer is characterized in that it has: The first split bobbin is provided with a plurality of first split roll parts in the axial direction, and a first fitting recess is provided at a predetermined gap between adjacent first split roll parts, wherein , the first split spool portion has a spool portion surrounded by a pair of flange portions, and The second split bobbin is provided with a plurality of second split drum parts in the axial direction, and a second fitting recess is provided at a predetermined gap between adjacent second split drum parts, wherein , the second split bobbin portion has a bobbin portion surrounded by a pair of flange portions, Each of the first fitting recesses is fitted with one of the plurality of second split roll parts corresponding to the first fitting recess, and each of the second fitting recesses One of the first split roll parts corresponding to the second fitting concave part is embedded in a plurality of the first split roll parts, the primary windings are continuously arranged on a plurality of the first split bobbins, The secondary winding is continuously arranged on a plurality of the second split bobbins. 2. The transformer according to claim 1, characterized in that, A first connecting portion is provided between the adjacent first split drum portions, and the first connecting portion connects the adjacent first split drum portions, A second connecting portion is provided between the adjacent second split drum portions, and the second connecting portion connects the adjacent second split drum portions, The first connection part and the second connection part are respectively provided with wire grooves, the wire grooves are formed by being recessed from the outer surfaces of the first connection part and the second connection part, and are used to guide Conductors constituting the primary winding and the secondary winding. 3. The transformer as claimed in claim 2, characterized in that, Between any one of the flange portions of the first split drum portion and the second connecting portion abutted by the flange portion, there is provided a a positioning component for positioning the coil former and the second split coil former, Between any one of the flange parts of the second split drum part and the first connecting part abutted by the flange part, there is provided a joint for the first split through fitting of concave and convex shapes. A positioning component for positioning the coil frame and the second split coil frame. 4. Transformer as claimed in claim 2 or 3, characterized in that, The flange portion is formed such that a supporting flange portion and an auxiliary flange portion are integrally provided in a stepped state, wherein a thickness of the auxiliary flange portion is smaller than a thickness of the supporting flange portion, In the first split reel portion, the support flange portion is located closer to the first connecting portion side than the auxiliary flange portion, In the second split drum portion, the support flange portion is located closer to the second connection portion than the auxiliary flange portion.