JP6302757B2 - Non-contact power transmission device - Google Patents

Description

  The present invention relates to a contactless power transmission device, and more particularly to a contactless power transmission device that transmits power using electromagnetic induction.

  One of the techniques for transmitting power in a non-contact manner is a non-contact power transmission apparatus that transmits power using electromagnetic induction. In this non-contact power transmission device, a coil on the power transmission side and a coil on the power reception side are arranged close to each other, and an electromotive force is generated in the coil on the power reception side using magnetic flux generated by passing a current through the coil on the power transmission side. It is generated to transmit power.

  In a non-contact power transmission device using electromagnetic induction, magnetic flux generated in a coil on the power transmission side may leak and adversely affect other devices. In the non-contact power transmission device disclosed in Patent Document 1, by arranging a soft magnetic sheet outside the coils facing each other, the leakage magnetic flux is prevented from adversely affecting other devices. In the non-contact power transmission device disclosed in Patent Document 1, the soft magnetic sheet is laminated with a laminate film, and the coil is laminated with a laminate film, thereby improving the mountability of the soft magnetic sheet and the coil. I am letting.

JP 2010-41906 A

  However, as in the technique disclosed in Patent Document 1, when a coil or a soft magnetic sheet is laminated with a laminate film, there is a problem that a laminating process is required and the manufacturing process becomes complicated. Moreover, in the non-contact power transmission device, when the relative positional relationship between the coil and the soft magnetic material sheet varies, there is a problem that the power transmission efficiency and impedance vary, and power cannot be transmitted stably.

  In view of the above problems, an object of the present invention is to provide a non-contact power transmission apparatus that can simplify the manufacturing process and stably transmit power.

  A non-contact power transmission device according to the present invention includes a bobbin including a core portion and a pair of flange portions provided at both ends in a direction parallel to a winding axis of the core portion, and the core portion. A coil wound around the outer periphery of the soft magnetic material plate disposed in a recess formed on an outer surface in a direction parallel to the winding axis of one of the pair of flange portions, and Have

  According to the present invention, it is possible to provide a non-contact power transmission device that can simplify the manufacturing process and stably transmit power.

1 is a top view illustrating an example of a non-contact power transmission apparatus according to a first embodiment. It is sectional drawing in the cutting line II-II of the non-contact electric power transmission apparatus shown in FIG. It is a top view which shows the bobbin with which the non-contact electric power transmission apparatus concerning Embodiment 1 is provided. FIG. 4 is a cross-sectional view taken along a cutting line IV-IV of the bobbin shown in FIG. 3. It is sectional drawing which shows an electric power supply apparatus provided with a power transmission unit, and an electronic device provided with a power receiving unit. It is a top view which shows an example of the non-contact electric power transmission apparatus concerning Embodiment 2. It is sectional drawing in the cutting | disconnection line VII-VII of the non-contact electric power transmission apparatus shown in FIG. It is a top view which shows the bobbin with which the non-contact electric power transmission apparatus concerning Embodiment 2 is provided. It is sectional drawing in the cutting | disconnection line IX-IX of the bobbin shown in FIG.

<Embodiment 1>
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a top view of an example of the non-contact power transmission apparatus 1 according to the first embodiment. FIG. 2 is a cross-sectional view of the non-contact power transmission apparatus 1 shown in FIG. FIG. 3 is a top view showing the bobbin 10 provided in the non-contact power transmission apparatus 1 according to the present embodiment. 4 is a cross-sectional view of the bobbin 10 shown in FIG. 3 taken along a cutting line IV-IV.

  As shown in FIGS. 3 and 4, the bobbin 10 has a pair of cores 11 and a pair of ends 21 and 22 (see FIG. 4) provided in a direction parallel to the winding axis 20 of the cores 11. Flange portions 12 and 13. The core part 11 has a cylindrical shape in which a cavity 15 is formed in the center part. 3 and 4 show an example in which the core portion 11 includes the cavity 15, the core portion 11 may not include the cavity 15. In other words, the core part 11 may be cylindrical.

  The flange portion 12 is formed so as to extend from the end portion 21 of the winding core portion 11 toward the outside in the direction perpendicular to the winding shaft 20. The flange portion 13 is formed so as to extend from the end portion 22 of the winding core portion 11 toward the outside in the direction perpendicular to the winding shaft 20. Between the flange part 12 and the flange part 13, the space | gap 16 for arrange | positioning the coil 25 is provided. In other words, the flange portion 12 and the flange portion 13 are arranged to face each other with the gap 16 therebetween. The shape of the bobbin 10 is a flat plate shape perpendicular to the winding shaft 20. Thus, by making the shape of the bobbin 10 into a flat plate shape, the contactless power transmission device 1 can be reduced in size and thickness.

  A recess 14 is formed on the outer surface of the flange portion 12 in the direction parallel to the winding axis 20. In the example shown in FIG. 3, the recess 14 is continuously formed on the outer surface of the flange portion 12. Note that the configuration shown in FIG. 3 is an example. For example, a plurality of recesses may be formed at positions corresponding to the plurality of soft magnetic plates 26 (see FIG. 1). Further, notches 17 and 18 are formed in part of the outer periphery of the flanges 12 and 13. For example, the bobbin 10 can be formed using an insulating material such as a resin material (that is, a material that transmits magnetic flux).

  As shown in FIGS. 1 and 2, a coil 25 is disposed in the gap 16 of the bobbin 10. In other words, the coil 25 is wound around the outer periphery of the core 11 of the bobbin 10. At this time, since the coil 25 is in contact with the flange portion 12 and the flange portion 13, the coil 25 can be stably disposed. For example, a normal conducting wire (round wire, flat wire, etc.), a litz wire, or the like can be used for the coil 25. In addition, when a high frequency current is passed through the coil 25, it is preferable to use a litz wire in consideration of power transmission efficiency.

  A plurality of soft magnetic plates 26 are arranged in the recess 14 formed on the outer surface of the flange portion 12. Although FIG. 1 shows the case where six soft magnetic plates 26 are arranged, the number of soft magnetic plates 26 may be other than this. As shown in FIG. 1, in the present embodiment, since the shape of the bobbin 10 when viewed in plan is circular, the shape of each soft magnetic plate 26 is substantially fan-shaped. The soft magnetic plate 26 needs to be disposed at a position where it overlaps with the coil 25 when the bobbin 10 is viewed in plan. Therefore, by making each soft magnetic plate 26 substantially fan-shaped, it is possible to increase the area where the coil 25 and the soft magnetic plate 26 overlap when the bobbin 10 is viewed in plan. Moreover, in order to suppress the leakage of magnetic flux, it is preferable that the gap between the soft magnetic plates 26 be as small as possible.

  The soft magnetic plate 26 can be configured using a material having a large relative permeability. Specifically, ferrite materials such as Mn—Zn ferrite and Ni—Zn ferrite, silicon steel, permalloy, sendust, and the like can be used. The soft magnetic plate 26 can be attached to the concave portion 14 of the flange portion 12 using an adhesive member such as an adhesive or a double-sided tape. For example, by using an elastic adhesive such as silicone as the adhesive member, it is possible to mitigate the impact acting on the soft magnetic plate 26 attached to the recess 14.

  In particular, the ferrite material is fragile compared to a metal material or the like, and thus has a property of being vulnerable to impact. Therefore, when the soft magnetic plate 26 is made of a ferrite material, the stress acting on the soft magnetic plate 26 is elastically bonded by fixing the soft magnetic plate 26 to the recess 14 using an elastic adhesive. It can absorb with a chemical | medical agent and it can suppress that the soft-magnetic-material board 26 is damaged.

  Further, in the present embodiment, as shown in FIG. 2, it is preferable to form a recess 14 having a depth such that the upper surface of the flange portion 12 and the upper surface of the soft magnetic plate 26 are substantially flush with each other. By setting it as such a structure, the soft-magnetic-material board 26 can be embedded in the recessed part 14 of the flange part 12, and the non-contact electric power transmission apparatus 1 can be made thin. The configuration shown in FIG. 2 is an example, and in the present embodiment, the depth of the recess 14 is set to the configuration shown in FIG. 2 as long as the soft magnetic plate 26 can be stably fixed to the flange portion 12. There is no limit. For example, the depth of the recess 14 may be shallower than that shown in FIG.

  FIG. 5 is a cross-sectional view illustrating a power supply device 31 including a power transmission unit 32 and an electronic device 33 including a power reception unit 34. The power transmission unit 32 and the power reception unit 34 can be configured using the non-contact power transmission apparatus 1 shown in FIGS. 1 and 2. The electronic device 33 is, for example, a portable device such as a mobile phone or a portable music player, an electric toothbrush, an electric shaving, or the like.

  As shown in FIG. 5, when power is transmitted from the power transmission unit 32 to the power reception unit 34, the power transmission unit 32 and the power reception unit 34 are disposed so as to be close to each other and face each other. Then, an alternating current is passed through the coil 25 of the power transmission unit 32 to generate a magnetic flux, and an electromotive force is generated in the coil 25 ′ of the power receiving unit 34 by electromagnetic induction by the generated magnetic flux. With such an action, power can be transmitted from the power transmission unit 32 to the power reception unit 34.

  A soft magnetic plate 26 is disposed on the flange portion 12 of the power transmission unit 32 (that is, the flange portion 12 opposite to the side on which the power receiving unit 34 is disposed). A soft magnetic plate 26 ′ is disposed on the flange portion 12 ′ of the power receiving unit 34 (that is, the flange portion 12 ′ opposite to the side where the power transmission unit 32 is disposed). As described above, by providing the power transmission unit 32 and the power reception unit 34 with the soft magnetic plates 26 and 26 ′, the power transmission efficiency can be improved. Moreover, it can suppress that the magnetic flux which generate | occur | produces when transmitting electric power from the power transmission unit 32 to the power receiving unit 34 leaks outside.

  As described in the background art, in the non-contact power transmission device disclosed in Patent Document 1, a soft magnetic sheet is laminated by laminating a soft magnetic sheet with a laminate film and further laminating a coil with the laminate film. Coil mountability was improved.

  However, as in the technique disclosed in Patent Document 1, when a coil or a soft magnetic sheet is laminated with a laminate film, there is a problem that a laminating process is required and the manufacturing process becomes complicated. In the non-contact power transmission device, for example, it is necessary to adjust the diameter and the number of turns of the coil in accordance with the transmitted power. However, when the coil is laminated with a laminate film, the shape of the wound coil is defined in advance, so that the degree of freedom in design is limited. Furthermore, in the non-contact power transmission device, when the relative positional relationship between the coil and the soft magnetic material sheet fluctuates, there is a problem that power transmission efficiency and impedance fluctuate and power cannot be stably transmitted. .

  Therefore, in the non-contact power transmission device 1 according to the present embodiment, the coil 25 is wound around the bobbin 10 including the core portion 11 and the flange portions 12 and 13 (see FIGS. 1 and 2). Thereby, the process of laminating the coil can be omitted. Further, since the amount of the coil 25 wound around the bobbin 10 can be freely changed, the degree of freedom in design can be improved. In addition, a coil coated with self-bonding may be used instead of the laminate film, but by winding the coil 25 around the bobbin 10 as in the present embodiment, self-bonding is possible. There is no need to use expensive coils with coatings.

  Furthermore, the use of the bobbin 10 increases versatility with respect to the specifications of soft magnetic plates and coils. Moreover, since the bobbin 10 is comprised with the insulating material, the insulation between the coil 25 and the soft-magnetic board 26 can be ensured. Moreover, the dimension of the bobbin 10 can be made into the dimension of the non-contact electric power transmission apparatus 1 as it is.

  In the non-contact power transmission device 1 according to the present embodiment, the soft magnetic plate 26 is disposed in the recess 14 formed on the outer surface of the flange portion 12 (see FIGS. 1 and 2). Therefore, since the fluctuation | variation of the relative positional relationship of the coil 25 and the soft-magnetic board | plate 26 can be suppressed, the fluctuation | variation of the efficiency and impedance of electric power transmission can be suppressed, and electric power can be transmitted stably. .

  In order to make the non-contact power transmission device thin, it is necessary to make the soft magnetic plate thin. However, if the area of the soft magnetic plate is large, if the soft magnetic plate is made thin, the soft magnetic plate is warped. There was a problem that occurred. In particular, when ferrite is used for the soft magnetic plate, the occurrence of warping was remarkable. For this reason, in order to form a soft magnetic plate that suppresses the occurrence of warpage, it was necessary to polish and thinly process the thickly formed ferrite.

  On the other hand, in the non-contact power transmission device 1 according to the present embodiment, the soft magnetic plate 26 disposed in the concave portion 14 of the flange portion 12 is divided into a plurality of portions. Therefore, since the area of each soft magnetic plate can be reduced, it is possible to prevent the soft magnetic plate from being warped by making the soft magnetic plate thin. Therefore, no polishing process is required. In addition, when the area of the soft magnetic plate is large, the press machine used at the time of molding is also large (for example, a 500 t press), but the area of each soft magnetic plate can be divided by dividing the soft magnetic plate into a plurality of pieces. Can be reduced, and molding can be performed using a small press (for example, a 60 t press).

  Even if the soft magnetic material plate is warped, in the non-contact power transmission device 1 according to the present embodiment, the soft magnetic material plate 26 is disposed in the concave portion 14 of the flange portion 12. The soft magnetic body 26 can be stably fixed to the flange portion 12. FIG. 5 shows a case where the non-contact power transmission device according to the present embodiment is used for both the power transmission unit 32 and the power reception unit 34, but one of these is known public power. It may be replaced with a transmission device.

  As described above, the invention according to this embodiment can provide a non-contact power transmission device that can simplify the manufacturing process and stably transmit power.

<Embodiment 2>
Next, a second embodiment of the present invention will be described. FIG. 6 is a top view showing an example of the non-contact power transmission apparatus 2 according to the present embodiment. 7 is a cross-sectional view taken along section line VII-VII of non-contact power transmission apparatus 2 shown in FIG. FIG. 8 is a top view showing the bobbin 40 provided in the non-contact power transmission apparatus 2 according to the present embodiment. FIG. 9 is a cross-sectional view of the bobbin 40 shown in FIG. 8 taken along section line IX-IX. In the first embodiment, the case where the shape of the bobbin when viewed in plan is a circular shape, but in the present embodiment, the case where the shape of the bobbin when viewed in plan is a rectangular shape will be described. In addition, about the part similar to the non-contact electric power transmission apparatus 1 demonstrated in Embodiment 1, description is abbreviate | omitted suitably.

  As shown in FIGS. 8 and 9, the bobbin 40 has a pair of core portions 41 and a pair of ends 51 and 52 (see FIG. 9) provided in the direction parallel to the winding shaft 50 of the core portion 41. Flange portions 42 and 43. The core part 41 has a shape in which a cavity 45 is formed in the center part. 8 and 9, an example in which the core portion 41 includes the cavity 45 is shown, but the core portion 41 may not include the cavity 45.

  The flange portion 42 is formed so as to extend from the end portion 51 of the winding core portion 41 toward the outside in the direction perpendicular to the winding shaft 50. The flange portion 43 is formed so as to extend from the end portion 52 of the winding core portion 41 toward the outside in the direction perpendicular to the winding shaft 50. A gap 46 for arranging the coil 55 is provided between the flange portion 42 and the flange portion 43. In other words, the flange portion 42 and the flange portion 43 are arranged to face each other with the gap 46 therebetween. The shape of the bobbin 40 is a flat plate shape perpendicular to the winding shaft 50. Thus, by making the shape of the bobbin 40 into a flat plate shape, the contactless power transmission device 2 can be reduced in size and thickness.

  A recess 44 is formed on the outer surface of the flange portion 42 in the direction parallel to the winding axis 50. In the example shown in FIG. 8, the recess 44 is continuously formed on the outer surface of the flange portion 42. The configuration shown in FIG. 8 is an example. For example, a plurality of recesses may be formed at positions corresponding to the plurality of soft magnetic plates 56 (see FIG. 6). For example, the bobbin 40 can be formed using an insulating material such as a resin material (that is, a material that transmits magnetic flux).

  As shown in FIGS. 6 and 7, a coil 55 is disposed in the gap 46 of the bobbin 40. In other words, the coil 55 is wound around the outer periphery of the core 41 of the bobbin 40. At this time, since the coil 55 contacts the flange portion 42 and the flange portion 43, the coil 55 can be stably disposed. For example, a normal conducting wire (round wire, flat wire, etc.), a litz wire, or the like can be used for the coil 55. In addition, when a high frequency current is passed through the coil 55, it is preferable to use a litz wire in consideration of power transmission efficiency.

  A plurality of soft magnetic plates 56 are arranged in the recess 44 formed on the outer surface of the flange portion 42. Although FIG. 6 shows a case where twelve soft magnetic plates 56 are arranged, the number of soft magnetic plates 56 may be other than this. In the present embodiment, since the shape of the bobbin 40 when viewed in plan is rectangular, the shape of each soft magnetic plate 56 can be rectangular (in the example shown in FIG. 6, square). Therefore, processing of the soft magnetic plate 56 is facilitated.

  Also in the present embodiment, the soft magnetic plate 56 can be configured using a material having a high relative magnetic permeability. Specifically, ferrite materials such as Mn—Zn ferrite and Ni—Zn ferrite, silicon steel, permalloy, sendust, and the like can be used. The soft magnetic plate 56 can be attached to the concave portion 44 of the flange portion 42 using an adhesive member such as an adhesive or a double-sided tape. For example, by using an elastic adhesive such as silicone as the adhesive member, it is possible to mitigate the impact acting on the soft magnetic plate 56 attached to the recess 44.

  Also in the non-contact power transmission apparatus 2 according to the present embodiment described above, the same effect as that of the non-contact power transmission apparatus 1 according to the first embodiment can be obtained.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the configuration of the above embodiment, and those skilled in the art within the scope of the invention of the claims of the present application claims. It goes without saying that various modifications, modifications, and combinations that can be made are included.

1, 2 Non-contact power transmission device 10, 40 Bobbin 11, 41 Core part 12, 13, 42, 43 Flange part 14, 44 Recess 15, 45 Cavity 16, 46 Air gap 17, 18 Notch part 20, 50 Winding Shaft 21, 22, 51, 52 End 25, 55 Coil 26, 56 Soft magnetic material plate 31 Power supply device 32 Power transmission unit 33 Electronic device 34 Power reception unit

Claims (9)

A bobbin comprising: a core part; and a pair of flange parts provided at both ends in a direction parallel to the winding axis of the core part;
A coil wound around the outer periphery of the core,
A soft magnetic plate disposed in a recess formed in an outer surface in a direction parallel to the winding axis of one of the pair of flange portions,
Non-contact power transmission device.   The contactless power transmission device according to claim 1, wherein a plurality of soft magnetic plates are arranged in the recess formed in the flange portion.   The non-contact power transmission device according to claim 1, wherein the soft magnetic plate is attached to the recess using an elastic adhesive.   4. The non-contact power transmission device according to claim 1, wherein the soft magnetic plate is disposed at a position overlapping the coil when the bobbin is viewed in plan. 5.   The non-contact power transmission device according to claim 1, wherein the bobbin has a flat plate shape perpendicular to the winding axis.   The said soft-magnetic board | plate is arrange | positioned at the flange part on the opposite side to the side by which the power transmission unit is arrange | positioned, when the said coil is a coil of a power receiving unit. Non-contact power transmission device.   The said soft-magnetic board is arrange | positioned at the flange part on the opposite side to the side by which the power receiving unit is arrange | positioned, when the said coil is a coil of a power transmission unit. Non-contact power transmission device. When the bobbin is viewed in plan, the bobbin has a circular shape,
In the concave portion of the flange portion, a plurality of substantially fan-shaped soft magnetic plates are disposed.
The non-contact electric power transmission apparatus as described in any one of Claims 1 thru | or 7. When the bobbin is viewed in plan, the bobbin has a rectangular shape,
A plurality of rectangular soft magnetic plates are disposed in the concave portion of the flange portion.
The non-contact electric power transmission apparatus as described in any one of Claims 1 thru | or 7.

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