JP3198717U - Magnetic structure for wireless charging coil - Google Patents

Abstract

A magnetic body structure for a wireless charging coil is provided. At least one concave groove 41 is formed on one surface of the magnetic body, including a magnetic body 40, and extends from the side end of the elongated magnetic body to the inside. The concave groove has at least one concave groove. Used to embed at least one lead wire of the winding, the concave groove penetrates the magnetic body, has two long side wall surfaces 43 and one short side wall surface 44, and the short side wall surface is circular toward the magnetic body. It exhibits an arc shape or a polygonal shape, and when the joining angle between the short side wall surface and the long side wall surface is larger than 90 degree angle, and the magnetic body is formed by pressure molding by such a concave groove, the material is gold When filling the mold, the material located at the junction of the long side wall and the short side wall of the groove can flow relatively easily from high to low, and the material density of the four sides of the magnetic groove is Is uniform or almost equal, which makes the long and short side walls of the concave groove of the magnetic body To resolve material density nonuniformity problems perpendicular form. [Selection] Figure 4

Description

  The present invention relates to the shape of a magnetic body in a kind of wireless charging coil unit, and more particularly to the structure of a thin magnetic body used in a kind of wireless charging coil unit.

  In recent years, products such as smart phones or tablet PCs and wearable devices have developed rapidly, requiring not only large screens, but also lightweight and thin features, and increasing demands for additional functions. One of the challenges for products such as smart phones or tablet PCs and wearable devices that are currently in use is charging, the charging plugs of each brand are different, and products such as smart phones or tablet PCs and wearable devices Because of the different requirements of power standards, wireless charging technology has become a challenge for innovation.

  In the wireless charging technology, electric power is transmitted by an electromagnetic induction method, and power is supplied and charged to a product such as a smart phone or a tablet PC and a wearable device. FIG. 1 is a display diagram of a known wireless charging technique, which includes a primary side module 10 and a secondary side module 20. The primary side module 10 and the secondary side module 20 have windings 11 and 21 and magnetic bodies 12 and 22, respectively, and when both approach each other, the primary side module 10 generates an electromagnetic wave, and the secondary side module 20 Is charged by converting it into electric power by electromagnetic induction.

  The wireless charging product is designed in consideration of the reduction in thickness under the premise that the final product (for example, a product such as a smart phone or a tablet PC and a wearable device) is thinner. As shown in the three-dimensional display diagram of the wireless charging module 30, both ends of the winding 31 must be extended out of the magnetic body 32 and electrically connected to a power input / output terminal (not shown). However, the inner end lead wire of the winding 31 cannot extend outside the magnetic body 32 unless it extends over the winding 31 from above the winding 31, and thus protrudes from the height of the winding. Accordingly, the applicant of the present invention submitted a Taiwan utility model No. 100215656 of a kind of wireless power transmission magnetic core structure on August 23, 2011, which is thinned as shown in the plan view of the magnetic body in FIG. In consideration of the above, a concave groove 33 is formed in the magnetic body 32, and a lead wire (not shown) is embedded in the concave groove 33, and is extended from the concave groove 33 and pulled out from the magnetic body 32. The height of the charging module has been reduced.

  When manufacturing a magnetic body, a magnetic material (for example, ferrite) is filled into a mold and formed by pressure molding. Generally, the density in the mold may not match, and the density during pressure molding is high. As shown in FIG. 3, if the density of the A portion is larger than B as shown in FIG. 3, the vertical corner portion of the joint portion between the long side and the short side of the groove 33 is the material flow. For this reason, the density in the vicinity of the concave groove 33 (A portion) is relatively high, and the material is blocked by the vertical corner portion and cannot flow to the relatively low density portion (B portion). The material density in the vicinity of the side 34 becomes non-uniform, which affects the electromagnetic distribution of the magnetic material, and causes problems such as deformation, thereby causing the problem of easily manufacturing a magnetic sheet with concave grooves at a low cost. This is a problem that the applicant wants to solve as soon as possible.

Taiwan Utility Model No. 100215656 Specification

  The main object of the present invention is to solve the problem of uneven material density at the time of manufacturing a magnetic material formed by the vertical corners of the concave grooves of the magnetic material.

  In order to solve the above problem, a main technical feature of the present invention is to provide a kind of magnetic structure for wireless charging, which includes a magnetic body and at least one concave portion on one surface of the magnetic body. A groove is formed and provided from one side to the inside of the magnetic body, the concave groove is used to embed at least one lead wire of at least one coil, the concave groove penetrates the magnetic sheet, It has two long-side walls and one short-side wall, and the short-side wall has an arc shape or a polygonal shape toward the magnetic body, and the joint angle between the short-side wall and the long-side wall is 90 degrees. When the material is filled in the mold before the magnetic sheet is formed by pressure molding by the groove having such a shape, the long side wall surface and the short side wall surface of the groove are Material located near the joint flows relatively easily from high density to low density Come, so that the material density in the vicinity of the groove is eliminated uniform or differential.

  As described above, the groove design of the magnetic sheet used for embedding the coil lead wire provided by the present invention is achieved by equalizing the material density of the magnetic sheet and easily embedding the coil lead wire in the groove. It can be easily derived from the groove, which is clearly different from known designs and increases the overall utility value. The foregoing is only a description of the preferred embodiments of the present invention, and is not intended to limit the present invention. Various modifications can be made within the scope of the claims, all of which are within the scope of the claims of the present invention. Belonging to.

It is a display figure of a well-known wireless charging technique. It is a three-dimensional view of a known wireless charging module. It is a top view of the magnetic body of Taiwan utility model No. 100215656. It is a three-dimensional view of the Example of the magnetic body shape for wireless charging coils of this invention. FIG. 5 is a plan view of FIG. 4. It is a local enlarged view of the Example of the ditch | groove short side of the magnetic body of this invention. It is a local enlarged view of another Example of the ditch | groove short side of the magnetic body of this invention. It is a local enlarged view of another Example of the ditch | groove short side of the magnetic body of this invention. It is a side view of another Example of the ditch | groove of the magnetic body of this invention.

  Please refer to FIG. FIG. 4 is a three-dimensional view of an embodiment of the magnetic body structure for a wireless charging coil according to the present invention. FIG. 5 is a plan view of FIG. The magnetic body 40 of the present invention has at least one concave groove 41, the concave groove 41 has an elongated shape, and the concave groove 41 is extended from the side edge of the magnetic body 40 toward the inside of the iron core plate, The elongated groove 41 can be used to embed at least one lead wire (not shown) of at least one winding. In the magnetic material process of the present invention, a material (not shown) is filled with a material, and further press-molded, and the material is a powder iron core (Iron Powder Core), a nickel zinc ferrite core (Ni-Zn Ferrite Core). ), Sendust core, iron silicon alloy core (Fe-Si Core), high flux core, and the like.

  The long groove 41 in the embodiment of the present invention penetrates the magnetic sheet 40 and has two long side wall surfaces 43 and one short side wall surface 44. The present invention solves the problem of uneven material density in the vicinity of the short-side wall surface 44 of the concave groove 41 of the magnetic body, so that the short-side wall surface of the concave groove 41 is inwardly contracted toward the magnetic body or a polygonal shape. 4 and 5, the short side wall 44 has a V-shaped wall surface on the magnetic body, and the inner angle of the V-shaped wall surface is larger than a 90 degree angle. When the material is filled in the mold before the pressure forming, when the material density of the portion A approaching the short side wall surface 44 of the concave groove 41 is relatively high, the material is relatively formed by the V-shaped wall surface during the pressure forming. It flows to the lower B portion, and thus the material density of the short side wall 44 portion becomes uniform or substantially equal to the density of the other portions of the magnetic body 40, thus solving the problem of non-uniform material density.

  See Figures 6A-6C. It is a local enlarged view of various embodiments of the short side of the concave groove of the magnetic body of the present invention, and the shape of the short side wall surface 44 of the concave groove 41 of the present invention is that of the short side wall surface 44 and the two long side wall surfaces 43. When the vertical corner portion is changed to a hypotenuse shape or an arc shape, and the magnetic body 40 is pressed by this, the material in the vicinity of the short side wall surface 44 flows from a high density location to a low density location, and the long sides Non-uniform density after molding is eliminated without being affected by the vertical corners of the wall surface and the short side wall surface. Accordingly, the short side wall 44 of the groove 41 of the present invention is a V-shaped wall, a U-shaped arc-shaped wall in FIG. 6A, a three-sided wall in FIG. 6B, or a five-sided wall in FIG. 6C. It can be a polygonal wall.

  Further, as shown in FIG. 7, according to the plan view of another embodiment of the magnetic body groove of the present invention, the groove 41 of the magnetic body 40 of the present invention has a winding lead wire (not shown). Thus, the lead wire of the winding is embedded in the concave groove 41, or the lead wire can be easily drawn out from the concave groove 41, and the concave groove 41 of the present invention has at least one long side thereof. An oblique side 45 is formed toward the magnetic body 40 at a portion of the wall surface 43 close to the short side wall surface 44, thereby enlarging the short side wall surface 44 of the groove 41, thus making it convenient for embedding the lead wire of the winding. . In addition, according to the present invention, a hypotenuse 46 is formed in the magnetic body 40 at a portion close to the opening of the end of the magnetic body 40 of at least one long side wall surface 41 of the concave groove 41, so that the magnetic body of the concave groove 41 is formed. The opening at the side edge of 40 is enlarged, and it is convenient to draw out the lead line from the groove 41.

DESCRIPTION OF SYMBOLS 10 Primary side module 20 Secondary side module 11, 21 Winding 12, 22 Magnetic body 30 Wireless charging module 31 Winding 32 Magnetic body 33 Groove 34 Short side 40 Magnetic body 41 Groove 43 Long side wall surface 44 Short side wall surface 45 46 A hypotenuse A part Material density is high B part Material density is low

Claims (7)

In the magnetic sheet structure for wireless charging coil,
A magnetic body having at least one concave groove formed on one surface, the concave groove having an elongated shape extending from an edge of the magnetic body to the inside, and the concave groove having at least one winding. Including the magnetic material used to embed at least one lead wire of the wire;
The concave groove has two long-side wall surfaces and one short-side wall surface, the short-side wall surface has an arc shape or a polygonal shape on the magnetic body, and a bonding angle between the short-side wall surface and the long-side wall surface is 90. When the material is filled in the mold before the magnetic body is formed by pressure molding with the concave groove having such a shape, the long side wall surface and the short side wall surface of the concave groove are joined. A magnetic body structure for a wireless charging coil, wherein a material located in the vicinity of a portion flows from a high density to a low density, and the material density around the concave groove of the magnetic body is uniform or substantially equal.   2. The magnetic body structure for a wireless charging coil according to claim 1, wherein the material is an iron powder core, a nickel zinc ferrite core, a sendust core, or an iron silicon alloy core. A magnetic body structure for a wireless charging coil, wherein the magnetic body structure is any one of (Fe-Si Core) and a high flux core.   The magnetic structure for a wireless charging coil according to claim 1, wherein the concave groove penetrates the magnetic body.   The magnetic structure for a wireless charging coil according to claim 1, wherein the short-side wall surface is a V-shaped wall surface on the magnetic body, and an inner angle of the V-shaped wall surface is larger than a 90 degree angle. Magnetic structure.   The magnetic structure for a wireless charging coil according to claim 1, wherein the short-side wall surface is a U-shaped wall surface of the magnetic body.   The structure of the magnetic body for a wireless charging coil according to claim 1, wherein a portion of at least one of the long side walls of the concave groove that approaches the short side wall surface is an oblique side with respect to the magnetic body, A magnetic structure for a wireless charging coil, characterized by enlarging a short side wall surface.   2. The magnetic body structure for a wireless charging coil according to claim 1, wherein a portion of the at least one long side wall surface of the concave groove that approaches the side edge of the magnetic body is formed as a hypotenuse toward the magnetic body. A magnetic body structure for a wireless charging coil, wherein a side edge opening of a groove is enlarged.

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