JP2007115818A - Improved structure of core and bobbin for inductor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved structures of a core and a bobbin for an inductor. <P>SOLUTION: The improved structure of the core and bobbin for an inductor is mainly formed in such a way that a middle column is provided in a core center, a groove is provided around the middle column, sidewalls are naturally formed on external edge of the groove, and notches of a small area are each provided on each of corners only. Further, a middle hole is provided on the center of the bobbin mating with the core, and a wire groove for winding the coil is provided on the external periphery of the middle hole. Still further, wire pedestals each having a projection are provided on each of corners of the bobbin. Still further, solder pins facing the same side are each provided on the upper edge of each of the wire pedestals, and the solder pins are each connected to a wire tip pulled out from the coil. The middle column enables to the core fit into the middle hole of the bobbin, the bobbin is housed into the groove and the wire pedestals can be each pulled from each of the notches of the core to the outside. The sidewalls for completely shielding the coil from neighboring coils is utilized to reduce magnetic leakage, thereby improving efficiency of the inductor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a core structure that effectively increases the area of a core covering a coil, reduces magnetic leakage, and increases the efficiency of an inductor device.

  As shown in FIG. 1, the conventional core structure of inductors and transformers is mainly E-shaped, and a central column 51 projecting from the same side at the center and two ends. The side columns 53 are provided separately, and a concave hollow portion 52 is provided between the middle column 51 and the two side columns 53. The bobbin 6 is blended with the core 5 and combined to form an inductor or a transformer. A center hole 61 is provided in the center of the bobbin 6, and a wire groove 62 around which the coil 621 is wound is provided on the outer periphery of the center hole 61. In addition, a solder pin 63 at the tip of the wire from which the coil 621 is drawn is separately installed at one end of the bobbin 6. The middle pillars 51 of the two cores 5 are brought into contact with each other after being placed in the bore 61 of the bobbin 6. In addition, the coils 621 around the center hole 61 are put in the hollow portions 52 respectively. At this time, each side column 53 of the two cores 5 is blended with the middle column 51 on the two outer sides of the coil 621 to form one magnetic circuit on the inner side of the coil 621. However, in the structure of the inductor or transformer of the above type, the area covering the side pillar 53 of the core 5 is extremely small, and the maximum part of the coil 621 is exposed to the outside, so that the magnetic leakage of the transformer is seriously caused. It is difficult to increase efficiency.

  The relatively advanced structure has a structure as shown in FIGS. 2 and 3, and a bobbin 4 is provided with a center hole 41 at the center, and a coil 421 is wound around the outer periphery of the center hole 41. A wire groove 42 is provided. In addition, one end of the bobbin 4 is provided with two extending portions 431, and each is connected to the middle stage of the two buses 432. On the two buses 432, solder pins 43 that lead out the wire tips of the coils 431 are separately provided. A middle pillar 31 is installed at the center of the core 3, and a groove 32 is provided around the middle pillar 31. In addition, side hollow portions 331 are provided on both sides of the groove path 32 so as to communicate with the outside, and other portions of the outer edge of the groove path 32 are naturally formed with two corresponding side walls 33. When combined, the middle pillars 31 of the two cores 3 enter into the bore 41 of the bobbin 4 and come into contact with each other. When the wire groove 42 (coil 421) is placed in the groove path 32, the two extending portions 431 extend outward from the side surface hollow portion 331 portion of the core 3, and the buses 432 and the solder pins 43 are positioned outside the core 3. To hold. A magnetic circuit is formed around the wire groove 421 by combining the side wall 33 of the core 3 with the middle pillar 31. However, the structure of this type of inductor or transformer can cover the core with a large area (two faces) compared to the structure of the above-described conventional inductor or transformer, but the side hollow portion 331 having a large hollow area. However, the coil 421 is exposed to the outside, and there is still a space where the magnetic leakage and efficiency of the inductor and the transformer can be improved.

  The gist of the present invention is to provide an improved structure for inductor cores and bobbins. The main part is provided with a middle pillar in the center of the core, a groove is placed around the middle pillar, and a side wall is naturally formed on the outer edge of the groove, and a small area notch is provided only at each corner. Moreover, a center hole is provided in the center of the bobbin to be blended therein, and a wire groove around which the coil is wound is installed on the outer periphery of the center hole. In addition, a protruding wire base is provided at each corner of the bobbin. Solder pins facing the same side are also installed on the upper edge of each wire base, and each is connected to the wire tip drawn from the coil. The core pillar of the core can be fitted into the bore of the bobbin, and the bobbin can be accommodated in the groove, so that each wire base of the bobbin can come out from each notch of the core. Using the completely covering side walls to the surrounding coils, it is possible to reduce the magnetic leakage and increase the efficiency of the inductor, which is the main object of the present invention.

The invention of claim 1 includes a core and a bobbin in an improved structure of an inductor core and a bobbin. A central pillar is provided at the center of the core, and a groove is disposed around the central pillar. A center hole is provided in the center of the bobbin, and the outer edge of the center hole is surrounded by a coil. The two cores are middle pillars which are fitted into the bobbin bores, and the bobbin is placed in the groove.
A side wall is provided around the outer edge of the groove in which the core is placed, and a notch is provided at each end of the side wall. And an inductor core characterized in that a wire base projecting at each end angle of the bobbin is provided, and is exited from each notch of the side wall, and the side wall surrounds the periphery of the bobbin to form a complete four-sided cover. The bobbin has an improved structure.
The invention according to claim 2 is the improved structure of the inductor core and bobbin described in claim 1, wherein a plurality of solder pins are installed on each wire base of the bobbin therein, and the connection of the wire tip drawn from the coil An improved structure of the inductor core and bobbin is provided.

  The improved inductor core and bobbin structure of the present invention can reliably reduce magnetic leakage and increase the efficiency of the transformer.

  As shown in FIGS. 1, 2 and 3, it is a conventional core and bobbin structure of various inductors and transformers.

  FIG. 4 is an exploded view of the structure of the present invention. As can be clearly seen from the figure, the present invention mainly includes two parts such as a core 1 and a bobbin 2. Among them, a middle pillar 11 is provided at the center of the core 1, and a groove 12 is provided around the middle pillar 11. In addition, the outer edge of the groove 12 naturally surrounds to form a peripheral side wall 13. A hollow notch 131 having a small area is provided at each end corner of the side wall 13. A center hole 21 is provided at the center of the bobbin 2, and a wire groove 22 around which the coil 221 is wound is provided at the outer edge of the center hole 21. In addition, protruding wire bases 23 are provided at the corners of each end of the bobbin 2, and solder pins 231 extend on the same side of each wire base 23. Each is connected to a wire tip drawn from the coil 221.

  FIG. 5 is a sketch of the overall combination of the present invention. As shown in the figure, at the time of combination, the two cores 1 are used, and the middle pillars 11 are placed in the boring hole 21 of the bobbin 2 so as to contact each other. In addition, the bobbin 2 is accommodated in the two grooves 12, and each wire base 23 protrudes from each notch 131. The side wall 13 of the core 1 completely surrounds the periphery of the coil 221 of the bobbin 2 to form a cover (only a small area of the notch 131 is exposed to the outside). Compared with the conventional structure, the magnetic leakage and efficiency of the inductor and transformer are clearly improved.

It is a sketch of a conventional inductor core and related parts. It is a structural exploded view of another conventional inductor core and related parts. It is a combination diagram of another conventional inductor core and related parts. It is a structure exploded view of the present invention. 1 is an overall combination diagram of the present invention.

Explanation of symbols

1, 3, 5 Core 12 Groove 131 Notch 21, 41, 61 Middle hole 221, 421, 621 Coil 31, 43, 63 Solder pin 33 Side wall 431 Extension part 52 Hollow part 11, 31, 51 Middle pillar 13 Surrounding side wall 2, 4, 6 Bobbins 22, 42, 62 Wire groove 23 Wire base 32 Groove path 331 Side hollow portion 432 Bus 53 Side pillar

Claims (2)

In the improved structure of the inductor core and bobbin, the core and bobbin are included. A central pillar is provided at the center of the core, and a groove is disposed around the central pillar. A center hole is provided in the center of the bobbin, and the outer edge of the center hole is surrounded by a coil. The two cores are middle pillars which are fitted into the bobbin bores, and the bobbin is placed in the groove.
A side wall is provided around the outer edge of the groove in which the core is placed, and a notch is provided at each end of the side wall. An inductor core and a bobbin characterized in that a wire base protruding at each end angle of the bobbin is provided so as to go out from each notch of the side wall, and the side wall surrounds the periphery of the bobbin to form a complete four-sided cover. Improved structure. The improved structure of the inductor core and bobbin according to claim 1, wherein a plurality of solder pins are installed on each wire base of the bobbin therein to provide connection of a wire tip drawn from the coil. Improved inductor core and bobbin structure.

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