JPH10205U - Trance - Google Patents

Abstract

(57) [Summary] To provide a transformer with good assembling workability. SOLUTION: A coil bobbin 1 having a hollow winding portion, an inner core portion 22 arranged inside the winding portion of the coil bobbin 1, and an outer core portion 25 arranged on the outer periphery of the winding portion. In a transformer having a core forming a closed magnetic circuit, two parallel vertically extending portions 21a interposed between both side surfaces of a winding portion of the coil bobbin 1 and an inner side surface of the outer core portion 25, The outer core portion 2 projects horizontally outward from the lower end of the vertical portion 21a.
5, two horizontal portions 21b and two vertical portions 2
A connecting portion 2 for connecting opposing ends of 1a
A frame-shaped insulating member 21 formed integrally with the coil bobbin 1c is fitted to the winding portion of the coil bobbin, and the cores 22, 25 are mounted on the coil bobbin 1.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a transformer, and more particularly to a transformer having good assembling workability.

[0002]

[Prior art]

 Laptop type, notebook type, palm top type word processor, STN liquid crystal display unit of personal computer, etc., use side-light type backlight, thinning of liquid crystal panel and light guide plate, thinning of cathode tube, and thinness feature. I'm trying.

In order to cope with this, it is indispensable to reduce the thickness of the transformer in order to reduce the thickness of the inverter power supply. In addition, since batteries are used for the drive power supply, there is a strong demand for higher efficiency of the inverter power supply. Inverter power supplies have been made thinner by surface mounting, and transformers have also been made thinner by surface mounting structures.

[0004] By the way, in a conventional transformer, a primary coil and a secondary coil are wound around a bobbin, an adhesive insulating tape is wound around the winding part several times, and arranged around the winding part and outside thereof. Insulation from the core to be done.

[0005]

[Problems to be solved by the invention]

 By the way, the conventional transformer requires winding the adhesive insulating tape around the winding portion of the bobbin several times for insulation and protection, and the work efficiency is poor because the adhesive insulating tape is handled.

Further, in order to wind the insulating tape neatly, it is necessary to wind the insulating tape around the winding portion of the bobbin while applying a certain amount of tension to the insulating tape. There was a drawback that the insulation effect was reduced or torn down due to thinning.

[0007] An object of the present invention is to eliminate such disadvantages of the prior art and to provide a transformer with good assembling workability.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a coil bobbin having a hollow winding portion, an inner core portion such as an I-shaped core disposed inside the winding portion of the coil bobbin, and a winding. The present invention is directed to a transformer including a core that forms a closed magnetic path with an outer core portion formed of, for example, a frame-shaped core, which is disposed on the outer periphery of the portion.

[0009] Two vertically extending parallel portions interposed between both side surfaces of the winding portion of the coil bobbin and the inner side surface of the outer core portion, and project horizontally outward from the lower end of each vertical portion. A frame-shaped insulating member integrally formed with two horizontal portions covering the lower surface of the outer core portion and a connecting portion for connecting the opposite ends of the two vertical portions to each other is formed by winding a coil bobbin. The core is fitted to the coil bobbin by fitting to the portion.

[0010]

[Embodiment of the invention]

 The present invention is configured as described above, and the insulation between the winding portion and the core is efficiently and reliably achieved by simply fitting the frame-shaped insulating member to the winding portion of the coil bobbin. Since the insulating member is frame-shaped and has a predetermined mechanical strength, automatic supply and automatic fitting to the coiled portion of the coil bobbin are easy.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the split winding bobbin from above, FIG. 2 is a perspective view of the split winding bobbin from below, FIG. 3 is an exploded perspective view of the transformer, FIG. 4 is a perspective view of the transformer from above, and FIG. Is a perspective view from below of the transformer, and FIG. 6 is a perspective view showing a joint state of the I-shaped core and the frame-shaped core. FIG. 7 is a perspective view of a frame type core according to another example, and FIG. 8 is a perspective view showing a joint state of the frame type core and the I-type core.

In the divided winding bobbin 1 shown in FIGS. 1 and 2, both sides of the primary coil winding groove 2 are separated by a partition flange 5, and the secondary coil- (I) winding groove 3 and the secondary coil- ( II) The winding groove 4 is provided. 6 in the figure is a core insertion port.

FIG. 3 shows a divided bobbin 1 in which a primary coil 7, a secondary coil- (I) 8, and a secondary coil- (II) 9 are wound. First, the secondary coil (I) 8 is wound around the secondary coil (I) winding groove 3, and the terminals 15 and 16 are pulled out with a lead wire. Next, the primary coil 7 is wound around the primary coil winding groove 2, and a lead wire is wound around the terminals 10 to 14 and pulled out. Finally, the secondary coil- (II) 9 is wound around the secondary coil- (II) winding groove 4, and the terminals 17, 20 and the like are pulled out with a lead wire. The winding of the coil may be wound in the order of the secondary coil (II) 9, the primary coil 7, and the secondary coil (I) 8.

The insulating holder 21 is fitted to the divided bobbin 1 around which the primary coil 7, the secondary coil- (I) 8, and the secondary coil- (II) 9 are wound. As shown in FIG. 1, if a guide such as roundness is provided at each corner of the partition flange 5 provided on the divided winding bobbin 1, the insulating holter 21 is fitted to the winding portion of the divided winding bobbin 1. Sometimes smooth and reliable.

As shown in FIG. 1, the insulating holder 21 includes two vertical portions 21a, 21a extending in parallel so as to face both side surfaces of the winding portion of the divided winding bobbin 1, and a lower end portion of each of the vertical portions 21a. , Two horizontal portions 21b, 21b protruding outward in the horizontal direction, two connecting portions 21c, 21c connecting the opposite ends of the two vertical portions 21a, 21a to each other, and one of the vertical portions 21a. It is composed of a frame forming form in which an insertion piece 21d standing inside is integrally formed.

The vertical portion 21 a and the horizontal portion 21 b connected thereto provide insulation between the primary coil 7, the secondary coil- (I) 8, the secondary coil- (II) 9 and the frame core 25, and The connection portion 21c provides insulation between the terminals 10 to 20 and the frame-shaped core 25. Further, by inserting the insertion piece portion 21c between the lead wire of the primary coil 7 and the secondary coil- (I) 8, Insulation between them can be achieved at the same time.

An I-shaped core 22 made of, for example, a magnetic material having a high saturation magnetic flux density and having a rectangular cross section in the longitudinal direction is inserted through the core insertion opening 6 of the divided winding bobbin 1 into which the insulating holder 21 is inserted. As shown in FIG. 3, the thickness t1 of the I-shaped core 22 is smaller than the thickness t2 of the frame-shaped core 25 (t1 <t2). Therefore, the divided bobbin into which the I-shaped core 22 is inserted. 1 is also thin.

As shown in FIG. 3, the frame-shaped core 25 has a hollow portion 30, and has a rectangular frame shape in plan view, and has a bottom surface at a position corresponding to both ends 23 a and 23 b of the I-shaped core 22. The recesses 26a and 26b are flat and stepped. Spacers 24a, 24b are attached to the recesses 26a, 26b.

As described above, the I-shaped core 22 is inserted into the winding part of the divided winding bobbin 1, and both ends 23 a and 23 b of the I-shaped core 22 project from the winding part, and both ends 23 a and 23 b Is inserted into the recesses 26a, 26b via the spacers 24a, 24b, and the winding portion of the divided winding bobbin 1 is arranged in the hollow portion 30 of the frame-shaped core 25 (see FIG. 4).

FIG. 6 is a view showing the joined state of the I-shaped core 22 and the frame-shaped core 25 with the divided winding bobbin 1 and the insulating holder 21 removed, and both ends 23 a and 23 b of the I-shaped core 22 are frame-shaped. By inserting into the recesses 26a and 26b of the core 25 and fixing with an adhesive, the I-shaped core 22 and the frame-shaped core 25 are joined to form a closed magnetic path.

As shown in FIG. 1, both ends 23 a and 23 b of the I-shaped core 22 are almost completely housed in the recesses 26 a and 26 b of the frame-shaped core 25. The lower surface and the three side surfaces on both sides of the concave portion 3b face the bottom surface and the three side surfaces of the concave portions 26a and 26b.

FIG. 4 and FIG. 5 are perspective views of the transformer. The terminals 10 to 14 are terminals of the primary coil 7, the terminals 15 and 16 are low and high voltage terminals of the secondary coil-(I) 8, respectively, and the terminals 17 and 20 are secondary coils-(II) 9 respectively. Low-voltage and high-voltage terminals.

When the terminals 16 and 17 are connected to an external lead wire or a transformer on a board by a pattern provided on the board, the secondary coil- (I) 8 and the secondary coil- ( II) 9 are connected in series, and a secondary output is taken out from a terminal 20. If the secondary coil- (I) 8 and the secondary coil- (II) 9 are not connected in series, two secondary outputs will be obtained.

FIGS. 7 and 8 are perspective views showing another example. A frame-shaped core 25b according to this example has an inner end near the center of a short side corresponding to both ends of the I-shaped core 22b. Groove-shaped recesses 33a and 33b are formed penetrating from the upper end to the outer end. By forming such recesses 33a and 33b, the longitudinal position can be adjusted when the I-shaped core 22b is inserted, and the assembly of the I-shaped core 22b and the frame-shaped core 25b is facilitated.

[0025]

[Effect of the invention]

 The present invention according to claim 1 is configured as described above, and the insulation between the winding portion and the core is efficiently and reliably achieved by simply fitting the frame-shaped insulating member to the winding portion of the coil bobbin. Since the insulating member is frame-shaped and has a predetermined mechanical strength, automatic supply and automatic fitting to the winding portion of the coil bobbin are easy.

According to the second aspect of the present invention, if the fitting guide is provided at the corner of the partition flange provided at the winding part, the fitting of the insulating member to the winding part is smooth and reliable. It is.

According to the third aspect of the present invention, a coil bobbin is formed by forming two recesses in a frame-shaped core, inserting both ends of an I-shaped core into the recesses, and externally fitting a frame-shaped insulating member. By inserting the wire part into the hollow part of the frame core, the total height of the transformer can be kept low and the transformer can be made thin.

According to the present invention, the transformer can be further thinned by making the thickness t1 of the I-shaped core smaller than the thickness t2 of the frame-shaped core.

According to the present invention, the recess is formed in a groove shape penetrating from the inner end to the outer end of the frame-shaped core. This makes it possible to adjust the position of the I-shaped core in the longitudinal direction on the frame-shaped core, so that the frame-shaped core and the I-shaped core can be easily assembled.

According to the present invention, both ends of the I-shaped core are bonded and fixed in the concave portion of the frame-shaped core. As described above, when the adhesive is used, the concave portion serves as an adhesive reservoir, so that the adhesive may flow out to other places on the frame-shaped core, and the fixing and fixing of the I-shaped core may become uncertain. And the I-shaped core can be securely fixed with a small amount of adhesive.

In the present invention, the transformer is specified for an inverter. This makes it possible to reduce the thickness of the inverter power supply.

[Brief description of the drawings]

FIG. 1 is a top perspective view of a split winding bobbin used in a transformer according to an embodiment of the present invention.

FIG. 2 is a perspective view from below of the divided winding bobbin.

FIG. 3 is an exploded perspective view of the transformer according to the embodiment of the present invention.

FIG. 4 is a perspective view from above of the transformer.

FIG. 5 is a perspective view of the transformer from below.

FIG. 6 is a perspective view showing a joining state of an I-shaped core and a frame-shaped core in the transformer.

FIG. 7 is a perspective view of a frame core according to another example of the present invention.

FIG. 8 is a perspective view showing a joint state of the frame-type core and the I-type core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Split winding bobbin 2 Primary coil winding groove 3 Secondary coil- (I) winding groove 4 Secondary coil- (II) winding groove 5 Partition flange 6 Core insertion port 7 Primary coil 8 Secondary coil- (I) 9 Secondary Coil- (II) 21 Insulating holder 21a Vertical part 21b Horizontal part 21c Connecting part 21d Insert piece 22, 22b I-shaped core 23a, 23b Both ends of I-shaped core 25, 25b Frame-shaped cores 26a, 26b, 33a, 33b recess 30 hollow part t1 thickness of I-shaped core t2 thickness of frame-shaped core

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01F 27/32 H01F 27/24 D 31/00 A

Claims (7)

[Utility model registration claims] 1. A magnetic body comprising: a coil bobbin having a hollow winding portion; an inner core portion disposed inside the winding portion of the coil bobbin; and an outer core portion disposed on the outer periphery of the winding portion. A transformer comprising a core forming a path, two parallel vertically extending portions interposed between both side surfaces of a winding portion of the coil bobbin and an inner side surface of the outer core portion; Two horizontal portions projecting outward from the lower end in the horizontal direction and covering the lower surface of the outer core portion;
A frame-shaped insulating member integrally formed with a connecting portion for connecting opposing ends of the two vertical portions is fitted to a winding portion of the coil bobbin, and the core is mounted on the coil bobbin. And a transformer. 2. The transformer according to claim 1, wherein a fitting guide portion is provided at a corner of a partition flange provided at the winding portion. 3. The method according to claim 1, wherein said inner core portion is inserted inside a winding portion of said coil bobbin.
The outer core portion is formed of a frame-shaped core disposed on the outer periphery of the winding portion, and a concave portion is formed at a position corresponding to both ends of the I-shaped core of the frame-shaped core. A transformer characterized in that both ends of an I-shaped core are inserted into the coil-shaped bobbin, and a winding portion of the coil bobbin, in which the frame-shaped insulating member is fitted, is inserted into a hollow portion of the frame-shaped core. 4. The transformer according to claim 3, wherein the thickness t1 of the I-shaped core is smaller than the thickness t2 of the frame-shaped core. 5. The transformer according to claim 3, wherein the recess has a groove shape penetrating from an inner end to an outer end of the frame-shaped core. 6. The semiconductor device according to claim 3, wherein I
A transformer, wherein the shape core is fixed to the frame-shaped core with an adhesive. 7. The transformer according to claim 3, wherein the transformer is a transformer for an inverter.