JP2018064459A - Non-contact power supply antenna system and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform efficient power supply even when an antenna has a non-planar shape.SOLUTION: A non-contact power supply antenna system 10 for supplying power, in a non-contact manner by electromagnetic induction, from a power transmission antenna device 18 to a power reception antenna device 22 opposite to the power transmission antenna device comprises: a power transmission spiral coil 20 that is provided on the transmission antenna device and is configured by wrapping conducting wire; and a power reception spiral coil 24 that is provided on the power reception antenna device and is configured by wrapping conducting wire. At least either one spiral coil of the power transmission spiral coil and the power reception spiral coil is configured to be in a non-planar shape. The spiral coils are arranged so that an inner edge n1 and an outer edge m1 of a projection of one spiral coil onto the other spiral coil are approximately overlapped with an inner edge B1' and an outer edge A1' of the other spiral coil so that positional deviation of both spiral coils is within a range less than ±2/36 with respect to length of a major axis of an outer diameter.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a contactless power supply antenna system that supplies power in a contactless manner from a power transmission side to a power reception side by electromagnetic induction, and an electronic device, and in particular, a structure of a contactless power supply antenna provided on a power transmission side and a power reception side, and Regarding placement.

  In the past, the practical use of non-contact power supply such as electromagnetic induction type and non-contact power supply, including the international standard “Qi (registered trademark)” established by WPC (Wireless Power Consortium) It is being promoted in various fields such as automobiles. Such non-contact power feeding is performed, for example, from a power transmission side coil to a power reception side coil by a power transmission device such as a charger including a power transmission side coil electromagnetically coupled to a power reception side coil incorporated in a power reception device such as a portable portable terminal. Power is fed toward the camera.

  Mobile phone terminals and PDAs and other portable information terminals serving as power receiving devices have been improved in function and size. However, as the size of the device has been reduced, power receiving coils for securing the power receiving function cannot be mounted. There was concern. As a conventional technique for realizing power feeding with higher power supply efficiency from the power transmission side even if the power receiving device is downsized, Patent Document 1 discloses that a base material of an antenna is formed of a flexible insulating member, and is folded and rolled up. A flexible power receiving coil that can be modified to be accommodated in a portable terminal is disclosed.

JP 2013-165190 A

  As mobile terminals become more functional and smaller, there is a concern that sufficient installation space for a flat spiral coil serving as an antenna cannot be secured. In addition to the enhancement and miniaturization of portable terminals, the shape of such devices is also diversifying so that so-called wristwatch-type portable terminals can be seen. In other words, in addition to the conventional flat plate type, the power receiving device configured in a non-planar shape, such as an R-shaped curved portion or a shape having a bent portion bent into an L shape, is put into practical use. Is planned.

  Therefore, the spiral coil constituting the power receiving antenna provided in the power receiving device has a non-planar shape having a curved portion, a bent portion, etc., and the power transmission side coil provided in the charger for the conventional flat type power receiving device is a flat plate type. Therefore, the loss of power supplied from the power transmission side coil to the power reception side coil increases. That is, it is not possible to efficiently supply power from a power transmission device such as a charger to a power reception device such as a portable terminal via the power transmission side coil and the power reception side coil. The power receiving coil disclosed in Patent Document 1 enables non-contact power feeding corresponding to the downsizing of the device. However, regarding power feeding efficiently through a non-planar non-contact power feeding antenna, reference is made. Not.

  The present invention has been made in view of the above problems, and a new and improved non-contact power feeding antenna system and electronic apparatus capable of efficient power supply even when the non-contact power feeding antenna is non-planar. The purpose is to provide.

  One aspect of the present invention is a non-contact power feeding antenna system that supplies electric power from a power transmitting antenna device to a power receiving antenna device facing the power transmitting antenna device by electromagnetic induction, the power transmitting antenna device A spiral coil for power transmission configured by winding a conductive wire and a spiral coil for power reception configured by circulating the conductive wire provided in the power receiving antenna device, and At least one of the power receiving spiral coils is configured to have a non-planar shape, and the positional deviation between the one spiral coil and the other spiral coil is the length of the major axis of the outer diameter of both spiral coils. From one spiral coil to the other spiral coil so as to be within a range of less than ± 2/36 with respect to the height Configured to the arrangement the inner edge and the outer edge of the projection is substantially overlaps the inner edge and the outer edge of said other spiral coil.

  According to one aspect of the present invention, even if at least one of the power transmission spiral coil and the power reception spiral coil is configured in a non-planar shape, the outer edge portion and the inner edge portion of the opposing power transmission and power reception spiral coils are arranged. There is almost no displacement. For this reason, the state where the efficiency of the power supply from the power transmission side to the power reception side can be maintained by electromagnetic induction.

  At this time, in one aspect of the present invention, the other spiral coil has an inner edge arranged inside the projection inner edge and an outer edge arranged outside the projection outer edge. It is good as it is.

  In this way, even when at least one of the spiral coil for power transmission and the spiral coil for power reception is configured in a non-planar shape, the power supply efficiency from the power transmission side to the power reception side is more reliably improved by electromagnetic induction. Can be maintained.

  In one embodiment of the present invention, the power transmission spiral coil and the power reception spiral coil may be configured in a non-planar shape having substantially the same curvature.

  In this way, even if both the spiral coil for power transmission and the spiral coil for power reception are configured in a non-planar shape, the power supply efficiency from the power transmission side to the power reception side is more reliably improved by electromagnetic induction. Can be maintained.

  In one embodiment of the present invention, the power transmission spiral coil and the power reception spiral coil may be configured to have a curved portion having substantially the same curvature.

  In this way, even if both the spiral coil for power transmission and the spiral coil for power reception are configured to have a curved portion with substantially the same curvature, power supply from the power transmission side to the power reception side is more reliably performed by electromagnetic induction. Can maintain a good efficiency.

  In one embodiment of the present invention, the power transmitting spiral coil and the power receiving spiral coil may be configured to have a bent portion that is bent at substantially the same angle.

  In this way, even if the spiral coil for power transmission and the spiral coil for power reception are both configured to have a bent portion that is bent at substantially the same angle, the power transmission side to the power reception side can be more reliably performed by electromagnetic induction. The power supply efficiency can be maintained in a good state.

  Another aspect of the present invention is an electronic apparatus, in which one of a power receiving spiral coil or a power transmitting spiral coil provided in any of the above-described contactless power feeding antenna systems is provided.

  According to another aspect of the present invention, even when the non-contact power feeding antenna is non-planar, efficient power supply is performed by a power transmitting device such as a charger or a power receiving device such as a portable terminal equipped with the non-contact power feeding antenna. Is realized.

  As described above, according to the present invention, even when the non-contact power feeding antenna is a non-planar shape, the antennas can be configured to reliably face each other. Therefore, from the power transmission side by electromagnetic induction to the power reception side. Can efficiently supply power.

1 is a block diagram illustrating a schematic configuration of a non-contact power feeding system to which a non-contact power feeding antenna system according to an embodiment of the present invention is applied. (A) thru | or (C) is a perspective view which shows schematic structure of the antenna system for non-contact electric power feeding which concerns on one Embodiment of this invention. It is AA sectional drawing of FIG.2 (C). It is explanatory drawing which shows the positional relationship of the spiral coil for power transmission and the spiral coil for power reception of the antenna system for non-contact electric power feeding which concerns on one Embodiment of this invention. (A) thru | or (D) is sectional drawing which shows the structural example of the spiral coil for power transmission and the spiral coil for power reception of the non-contact electric power feeding antenna system which concerns on one Embodiment of this invention. It is sectional drawing which shows the other application example of the antenna system for non-contact electric power feeding which concerns on one Embodiment of this invention. (A) thru | or (C) is explanatory drawing which shows the positional relationship of the spiral coil for power transmission and the spiral coil for power reception in the Example of the non-contact electric power feeding antenna system which concerns on one Embodiment of this invention. It is a characteristic view which shows the relationship between the positional relationship of the spiral coil for power transmission and the spiral coil for power reception by the Example of the non-contact electric power feeding antenna system which concerns on one Embodiment of this invention, and the increase / decrease rate of a magnetic coupling coefficient.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.

  First, a schematic configuration of a non-contact power feeding system to which a non-contact power feeding antenna system according to an embodiment of the present invention is applied will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a non-contact power feeding system to which a non-contact power feeding antenna system according to an embodiment of the present invention is applied.

  The non-contact power feeding antenna system 10 according to an embodiment of the present invention performs non-contact power feeding by electromagnetic induction from a power transmission device 12 including an electronic device such as a charger to a power receiving device 14 including an electronic device such as a portable terminal. This is applied to the contactless power feeding system 1 to be performed.

  The power transmission apparatus 12 includes a power transmission circuit 16 provided with a resonance capacitor (not shown) and the like, and a power transmission antenna provided with a power transmission spiral coil 20 serving as a power transmission coil formed by winding a conducting wire (not shown). Device 18. On the other hand, the power receiving device 14 is provided with a power receiving antenna device 22 provided with a power receiving spiral coil 24 serving as a power receiving coil formed by winding a conducting wire (not shown), a rectifier circuit (not shown), and the like. A power receiving circuit 26 and a battery 28 are provided.

  The power transmission circuit 16 supplies electric power supplied from a power source 30 such as a commercial AC power source to the power receiving device 14 via a power transmission antenna device 18 constituting a contactless power feeding antenna. The power receiving circuit 26 receives the power transmitted from the power transmitting device 12 via the power receiving antenna device 22 constituting the non-contact power feeding antenna, and supplies the battery 28 with power for charging.

  In the present embodiment, an electromotive force is generated in the power receiving spiral coil 24 facing the power transmitting spiral coil 20 at a short distance by changing a magnetic field generated by a current flowing in the power transmitting spiral coil 20. Then, power from the power supply 30 is supplied from the power transmission device 12 to the battery 28 of the power reception device 14. Thus, in the non-contact power feeding system 1, the non-contact power feeding antenna system 10 according to one embodiment of the present invention supplies power from the power transmitting antenna device 18 to the power receiving antenna device 22 by electromagnetic induction in a non-contact manner. To do.

  When power is supplied from the power transmission device 12 to the power reception device 14 in the non-contact power supply system 1, the alignment of the power transmission spiral coil 20 and the power reception spiral coil 24 is important in order to increase power supply efficiency. In other words, when the power transmission spiral coil 20 is greatly deviated from the power reception spiral coil 24, the magnetic coupling between the power transmission spiral coil 20 and the power reception spiral coil 24 becomes weak, so that the power supply efficiency decreases.

  In particular, in this embodiment, even when at least one of the power transmission spiral coil 20 or the power reception spiral coil 24 is configured in a shape having a curved portion or a bent portion, the power supply efficiency is not lowered and the efficiency is reduced. In order to supply electric power, technical features are applied to the structure and arrangement of the non-contact power feeding antennas on the power transmission side and the power reception side.

  As described above, in an electronic device such as a mobile phone terminal or a portable information terminal whose size has been reduced, it is difficult to secure a large flat portion for disposing a non-contact power feeding antenna because of installation space. For this reason, when a non-contact power feeding antenna is mounted in a narrow part of a miniaturized electronic device, the power feeding efficiency deteriorates, and the non-contact power feeding antenna system 10 applied to the non-contact power feeding system 1 is downsized. This has been a major problem when mounted on the electronic devices 12 and 14.

  For this reason, in this embodiment, in order to solve such a problem, the flat portion is provided by arranging a non-contact power feeding antenna that can correspond to the shape of a non-planar shape portion having a bend or a curvature in which the flat portion cannot be secured. Even if this cannot be ensured, efficient power supply is possible. As a result of intensive studies in order to achieve the above-described object of the present invention, the present inventor has a power transmission antenna device 18 that does not hinder the securing of power feeding efficiency in a contactless power feeding antenna having a bend or a curvature. The optimum region was found in the relative size (coil width of the opposing surface) of the spiral coils 20 and 24 of the power receiving antenna device 22 and the relative arrangement relationship.

  Next, a schematic configuration of a contactless power feeding antenna system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a perspective view showing a schematic configuration of a non-contact power feeding antenna system according to an embodiment of the present invention. FIG. 2A is a power receiving antenna device 22 provided in the non-contact power feeding antenna system of the present embodiment. (B) shows a perspective view of the power transmission antenna device 18 provided in the non-contact power feeding antenna system of the present embodiment, and (C) shows the non-contact power feeding antenna system of the present embodiment. The perspective view in the electric power feeding state is shown.

  As shown in FIG. 2C, the contactless power feeding antenna system 10 of the present embodiment includes bent portions 19 and 23 in which the power transmitting antenna device 18 and the power receiving antenna device 22 are bent at substantially the same angle. Configured in shape. That is, the power transmission spiral coil 20 and the power reception spiral coil 24 that are opposed to each other are configured to have bent portions 19 and 23 that are bent at substantially the same angle.

  As shown in FIG. 2A, the power receiving antenna device 22 includes a power receiving spiral coil 24 on an outer surface side, that is, a bent surface side of a magnetic body 25 bent in a substantially L shape via an adhesive member (not shown). Is glued. That is, in the power receiving antenna device 22, the power receiving spiral coil 24 is arranged on the bent surface side of the bent portion 23. The bent surface side means the outer surface side of the bent portion 23 bent in a convex shape.

  On the other hand, as shown in FIG. 2 (B), the power transmitting antenna device 18 has a power transmitting spiral coil 20 provided with an adhesive member (not shown) on the inner surface side, that is, the bent back surface side of the magnetic body 21 bent in a substantially L shape. Is glued through. That is, in the power transmission antenna device 18, the power transmission spiral coil 20 is arranged on the bent back surface side of the bent portion 19. In addition, the bending back surface side shall show the inner surface side of the bending part 19 bent in convex shape.

  As described above, in this embodiment, the power transmitting antenna device 18 and the power receiving antenna device 22 are configured to have non-planar shapes in which the power transmitting spiral coil 20 and the power receiving spiral coil 24 have substantially the same curvature. For this reason, when performing non-contact power feeding, as shown in FIG. 2C, the power transmitting antenna device 18 and the power receiving antenna device 22 are arranged such that the power transmitting spiral coil 20 and the power receiving spiral coil 24 face each other. become.

  In other words, in the present embodiment, the power receiving device 14 (see FIG. 1) is small enough that there is not enough room for installing a flat plate type power receiving antenna as in the conventional case, or a so-called wristwatch type device. Since the shape of the main body itself is a non-planar shape, the power transmission antenna provided in the power transmission device 12 (see FIG. 1) is provided when the power receiving antenna itself to be installed must be a non-planar shape. The spiral coil 20 for use is also configured in a non-planar shape having the same curvature. For this reason, the state where the efficiency of the electric power supply from the power transmission apparatus 12 to the power receiving apparatus 14 can be maintained by electromagnetic induction.

  2A to 2C, the power receiving spiral coil 24 of the power receiving antenna device 22 is disposed on the bent surface side of the bent portion 23, and the power transmitting spiral coil of the power transmitting antenna device 18 is provided. Although 20 is arrange | positioned at the bending back surface side of the bending part 19, each is good also as a reverse structure. That is, the power receiving spiral coil of the power receiving antenna device may be arranged on the bent back surface side of the bent portion, and the power transmitting spiral coil of the power transmitting antenna device may be arranged on the bent surface side of the bent portion.

  Next, the positional relationship between the power transmitting antenna device 18 and the power receiving antenna device 22 in the contactless power feeding antenna system 10 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a cross-sectional view taken along the line AA in FIG.

  The power transmission spiral coil 20 and the power reception spiral coil 24 have substantially the same shape and size, and are disposed so as to substantially overlap each other. That is, the power transmission spiral coil 20 and the power reception spiral coil 24 are configured to have bent portions 19 and 23 bent at substantially the same angle, and are configured to have non-planar shapes having substantially the same curvature.

  In the present embodiment, the power transmission spiral coil 20 is configured to be somewhat larger in size than the power reception spiral coil 24. In the present embodiment, the somewhat larger one is used as the spiral coil 20 of the power transmission antenna device 18, but either one of the antenna devices 18 and 22 may be used for power transmission or power reception. Generally, since there is often a space on the power transmission side, it is preferable that the spiral coil 20 of the power transmission antenna device 18 is enlarged and the magnetic body 21 is also enlarged at that time. .

  In order to maintain a good power supply efficiency from the power transmitting device 12 to the power receiving device 14 by electromagnetic induction, the respective spiral coils provided in both antenna devices 18 and 22 constituting the non-contact power feeding antenna system 10. 20 and 24 need to be arranged facing each other so as not to deviate from each other. For this reason, in this embodiment, as shown in FIG. 3, the inner edges n1 and n2 and the outer edges m1 and m2 of the projection from the power receiving spiral coil 24 to the power transmitting spiral coil 20 are the inner edges of the power transmitting spiral coil 20. B1 ', B2' and outer edge portions A1 ', A2' are configured to be substantially overlapped.

  Specifically, as shown in FIG. 3, the spiral coil for power transmission 20 has inner edges B1 ′ and B2 ′ arranged inside the projected inner edges n1 and n2 and the outer edge of the spiral coil for power transmission 20. The parts A1 ′ and A2 ′ are arranged outside the projection outer edge parts m1 and m2. That is, the power transmission spiral coil 20 is configured to be somewhat larger in size than the power reception spiral coil 24, and the inner edge portions B 1 ′ and B 2 ′ thereof are disposed inside the inner edge portions B 1 and B 2 of the power reception spiral coil 24. In addition, the outer edge portions A1 ′ and A2 ′ are arranged outside the outer edge portions A1 and A2 of the power receiving spiral coil 24. Note that this arrangement relationship is preferably satisfied over the entire circumference of the coil. For example, the position of the inner edge B2 ′ of the power transmission spiral coil 20 is arranged on the outer circumference side than the position of the projected inner edge n2, or The position of the outer edge portion A2 ′ of the spiral coil 20 may be in a state where it is not satisfied in a part of the portion, such as being arranged on the inner peripheral side from the position of the projection outer edge portion m2.

  Next, the positional relationship between the power transmission spiral coil and the power reception spiral coil of the non-contact power feeding antenna system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 4 is an explanatory diagram showing a positional relationship between a power transmission spiral coil and a power reception spiral coil of the non-contact power feeding antenna system according to the embodiment of the present invention.

  As a result of intensive studies in order to achieve the above-described object of the present invention, the present inventor, as a result of the non-planar non-contact power feeding antenna, the power receiving spiral coil 24 and the power transmitting spiral that do not hinder the securing of power feeding efficiency. The optimum region was found in the relative arrangement relationship of the coils 20.

  As shown in FIG. 4, when the inner edge portion B <b> 2 ′-1 of the power transmission spiral coil 20-1 is arranged outside the outer edge portion A <b> 2 of the power reception spiral coil 24, the power supply efficiency is poor. Further, when the inner edge B2′-2 of the power transmission spiral coil 20-2 is disposed inside the outer edge A2 of the power reception spiral coil 24 and is disposed outside the inner edge B2 of the power reception spiral coil 24. However, power supply efficiency is still poor.

  In contrast, the inner edge B2′-3 of the power transmission spiral coil 20-3 is disposed on the inner side of the inner edge B2 of the power reception spiral coil 24, and the outer edge A2′− of the power transmission spiral coil 20-3. In the case where 3 is disposed outside the outer edge portion A2 of the power receiving spiral coil 24, the power feeding efficiency is improved. That is, the inner edge B2′-3 of the power transmission spiral coil 20-3 is disposed on the inner side of the projected inner edge n2-3, and the outer edge A2′-3 of the power transmission spiral coil 20-3 is the projected outer edge m2. When arranged outside -3, the power supply efficiency is improved.

  On the other hand, as shown in FIG. 4, when the outer edge portion A2′-5 of the power transmission spiral coil 20-5 is disposed inside the inner edge portion B2 of the power reception spiral coil 24, the power supply efficiency is poor. Further, when the outer edge portion A2′-4 of the power transmission spiral coil 20-4 is disposed on the inner side of the outer edge portion A2 of the power reception spiral coil 24 and is disposed on the outer side of the inner edge portion B2 of the power reception spiral coil 24. However, power supply efficiency is still poor.

  As described above, in order to maintain good power feeding efficiency, the inner edge B2 ′ of the power transmission spiral coil 20 is disposed on the inner side of the projection inner edge n2, and the outer edge A2 ′ of the power transmission spiral coil 20 is projected. It turns out that it is preferable to set it as the structure arrange | positioned outside the outer edge part m2. That is, even when the power transmission spiral coil 20 and the power reception spiral coil 24 are configured in a non-planar shape, the arrangement of the power transmission spiral coil 20 and the power reception spiral coil 24 under the above conditions is required in order to improve power supply efficiency. It is necessary to satisfy the relationship.

  In the present embodiment, both the power transmitting spiral coil 20 and the power receiving spiral coil 24 are configured to have substantially L-shaped bent portions 19 and 23. The contact feeding antenna system 10 is not limited to this configuration. That is, at least one of the power transmission spiral coil 20 and the power reception spiral coil 24 is configured to have a non-planar shape, and the inner and outer edges of the projection from one spiral coil to the other spiral coil are the other spiral coil. What is necessary is just to be comprised so that it may become a substantially overlapping arrangement | positioning with the inner edge part and outer edge part of a spiral coil.

  Next, another embodiment of the contactless power feeding antenna system according to one embodiment of the present invention will be described with reference to the drawings. 5A to 5D are cross-sectional views illustrating configuration examples of a power transmission spiral coil and a power reception spiral coil of the contactless power feeding antenna system according to the embodiment of the present invention. FIG. 6 is a cross-sectional view showing another application example of the non-contact power feeding antenna system according to one embodiment of the present invention.

  As shown in FIG. 5A, in the non-contact power feeding antenna system 110, the power transmitting antenna device 118 and the power receiving antenna device 122 may be configured to have curved portions 119 and 123 having substantially the same curvature. The contactless power feeding antenna system according to an embodiment of the present invention can be applied. That is, even if the spiral coil for power transmission 120 affixed to the magnetic sheet 121 and the spiral coil 124 for power reception affixed to the magnetic sheet 125 are configured to have the curved portions 119 and 123 having substantially the same curvature, the electromagnetic wave is more reliably generated. The state of good power supply efficiency from the power transmission side to the power reception side can be maintained by induction.

  5B, in the non-contact power feeding antenna system 210, bent portions 219a, 219b, 223a, and 223b in which the power transmitting antenna device 218 and the power receiving antenna device 222 are bent at substantially the same angle are provided. Even if each of the two locations is provided, the non-contact power feeding antenna system 10 according to one embodiment of the present invention can be applied. That is, two bent portions 219a, 219b, 223a, and 223b in which the power transmission spiral coil 220 attached to the magnetic sheet 221 and the power reception spiral coil 224 attached to the magnetic sheet 225 are bent at substantially the same angle are provided. Even in this configuration, it is possible to more reliably maintain a state in which the efficiency of power supply from the power transmission side to the power reception side is good by electromagnetic induction.

  Further, as shown in FIG. 5C, in the non-contact power feeding antenna system 310, even if only one of the power transmitting antenna device 318 and the power receiving antenna device 322 is formed in a non-planar shape, The contactless power feeding antenna system 10 according to the embodiment can be applied. For example, the contactless power feeding antenna system 10 according to an embodiment of the present invention can be applied even if the power transmitting antenna device 318 is a flat plate type and only the power receiving antenna device 322 is configured in a non-planar shape.

  That is, even if the power receiving antenna device 322 is configured to have two bent portions 323a and 323b as shown in FIG. 5C, the power transmitting spiral coil 320 and the power receiving spiral coil 324 are almost displaced. What is necessary is just to become the structure which opposes. In other words, the power transmitting spiral coil 320 affixed to the magnetic sheet 321 and the power receiving spiral coil 324 affixed to the magnetic sheet 325 are opposed to each other with almost no deviation in the width direction shown in FIG. Then, it is possible to more reliably maintain a state in which the efficiency of power supply from the power transmission side to the power reception side is good by electromagnetic induction.

  As shown in FIG. 5D, in the non-contact power feeding antenna system 410, the power transmitting antenna device 418 and the power receiving antenna device 422 may have a three-dimensional curved shape having substantially the same curvature. The contactless power feeding antenna system 10 according to the embodiment can be applied. That is, even if the spiral coil for power transmission 420 affixed to the inner surface side of the magnetic sheet 421 and the spiral coil for power reception 424 affixed to the outer surface side of the magnetic sheet 425 have a three-dimensional curved surface shape having substantially the same curvature, respectively. The state of good power supply efficiency from the power transmission side to the power reception side can be maintained by electromagnetic induction.

  Further, as shown in FIG. 6, in the non-contact power feeding antenna system 510, the power transmitting antenna device 518 and the power receiving antenna device 522 are not only the non-contact power feeding antennas 520 and 524 but also communication antennas 526 and 527 such as NFC. The antenna system 10 for non-contact power feeding according to an embodiment of the present invention can also be applied to an antenna device configured in parallel. That is, the spiral coil for power transmission 520 and the communication antenna 526 affixed to the magnetic sheet 521 and the spiral coil for power reception 524 and the communication antenna 527 affixed to the magnetic sheet 525 are configured to have curved portions 519 and 523 having substantially the same curvature. Even in such a case, it is possible to more reliably maintain a good power supply efficiency from the power transmission side to the power reception side by electromagnetic induction.

  As described above, in this embodiment, even if at least one of the spiral coils 20 and 24 provided in the power transmission antenna device 18 and the power receiving antenna device 22 serving as a non-contact power feeding antenna is non-planar, It can be set as the structure used as the arrangement | positioning which 22 spiral coils 20 and 24 oppose reliably. For this reason, it is possible to efficiently supply power from the power transmission side to the power reception side by electromagnetic induction regardless of the shapes and installation modes of the antenna devices 18 and 22.

  In addition, it is possible to maintain high power supply efficiency in the non-contact power supply system in response to downsizing of the device body of the electronic device and diversification of its shape. In other words, in addition to the conventional flat plate type, the power receiving device configured in a non-planar shape, such as an R-shaped curved portion or a shape having a bent portion bent into an L shape, is put into practical use. By applying the non-contact power feeding antenna system according to one embodiment of the present invention, high power feeding efficiency in the non-contact power feeding is ensured.

  Therefore, even in the future, even if electronic devices have higher functions, smaller sizes, diversified apparatus main bodies, etc., it is possible to realize efficient non-contact power feeding that can cope with them. Further, by applying the non-contact power feeding antenna system 10 according to an embodiment of the present invention, the degree of freedom in designing electronic devices such as portable terminals and chargers used for non-contact power feeding is also improved.

  Next, examples of the contactless power feeding antenna system according to an embodiment of the present invention will be described with reference to the drawings. FIGS. 7A to 7C are explanatory views showing the positional relationship between a power transmission spiral coil and a power reception spiral coil in an example of a non-contact power feeding antenna system according to an embodiment of the present invention. FIG. 8 is a graph showing the relationship between the positional relationship between the spiral coil for power transmission and the spiral coil for power reception and the increase / decrease rate of the magnetic coupling coefficient in the example of the non-contact power feeding antenna system according to one embodiment of the present invention. FIG.

  In order to demonstrate the operation and effect of the contactless power supply antenna system 10 (see FIG. 1) according to one embodiment of the present invention, this example is for contactless power supply shown in FIGS. Antenna systems 610, 710, 810 were used.

  In each embodiment, two antenna devices 618, 622 (718, 722, 818, 822) are prepared, and one antenna is bent so that the installation surface of the spiral coil 624 (724, 824) is on the bent surface side. The device 622 (722, 822) was used, and the other was the antenna device 618 (718, 818) bent so that the installation surface of the spiral coil 620 (720, 820) was on the bent back side. In this embodiment, the antenna device 622 (722, 822) is a power receiving antenna device, and the antenna device 618 (718, 818) is a power transmitting antenna device.

  FIG. 7A shows a state in which antenna devices 618 and 622 created by bending in the same shape are opposed to each other along the central axis of the antenna devices 618 and 622. When the antenna devices 618 and 622 are bent at 90 degrees, the spiral coil 620 of the antenna device 618 is shifted by ΔL toward the center of the spiral coil 620 with respect to the spiral coil 624 of the antenna device 622. turn into.

  Next, FIGS. 7B and 7C show a state in which the shape of the antenna device is changed and bent so as to face each other in the same manner. FIG. 7B shows an example in which the inner peripheral position and the outer peripheral position of the spiral coil 724 of the antenna device 722 and the spiral coil 720 of the antenna device 718 coincide with each other in the vertical direction of the winding portions of the spiral coils 724 and 720. This is an example in which the positional deviation ΔL is zero. On the other hand, FIG. 3C illustrates an example in which the spiral coil 820 of the antenna device 818 is shifted outward with respect to the spiral coil 824 of the antenna device 822.

  With respect to the examples shown in FIGS. 7A to 7C, how the magnetic coupling state between the antenna devices changes was examined by electromagnetic field simulation. The shape of the antenna devices 622, 722, 822 at this time is such that the size of the magnetic bodies 625, 725, 825 is 45 mm (long side length) × 35 mm (short side length), and the spiral coils 624, 724, The outer diameter and inner diameter of 824 are 36 mm × 32 mm and 21 mm × 17 mm, respectively.

  The electromagnetic field simulation results are shown in FIG. In FIG. 8, FIG. 7A corresponds to the positional deviation ΔL = −2.8 mm, FIG. 7B corresponds to the positional deviation ΔL = 0 mm, and FIG. 7C corresponds to the positional deviation ΔL = 1.4 mm. . FIG. 8 shows the increase / decrease rate of the magnetic coupling coefficient between the opposing antenna devices, and shows the increase / decrease rate of the magnetic coupling coefficient with respect to the value in the state of FIG.

  As shown in FIG. 8, when the coils on the power receiving side and the power transmitting side shown in FIG. 7A having substantially the same size and shape are bent and faced as they are, both spiral coils 620 and 624 are used. Is out of position. For this reason, the loss of the electric power supplied from the power transmission side to the power reception side occurs, and the magnetic coupling coefficient is reduced correspondingly.

  On the other hand, as shown in FIG. 8, the spiral coil 724 of the antenna device 722 and the spiral coil 720 of the antenna device 718 shown in FIG. It can be seen that the magnetic coupling coefficient shows the largest value when matched in the vertical direction of the turning part. That is, when the spiral coils 720 and 724 of the antenna devices 718 and 722 for non-contact power feeding have a non-planar shape having bent portions 719 and 723, in order to increase the electrode supply efficiency by non-contact power feeding, both spirals are used. It can be seen that the coils 720 and 724 need to be provided so as to face each other without shifting.

  As shown in FIG. 8, even if the positional deviation ΔL is not 0 mm, the increase / decrease rate is 4% or more, that is, a high magnetic coupling coefficient if it is within the range of ΔL = ± 2.0 mm. I understand. From this, it can be seen that if the positional deviation between the power transmitting side and power receiving side antenna devices is within the range of a slight difference, it is possible to ensure high power supply efficiency by the non-contact type. In other words, if the inner edge and the outer edge of the projection from one spiral coil to the other spiral coil are arranged so as to substantially overlap the inner edge and the outer edge of the other spiral coil, high power supply by non-contact type It turns out that efficiency can be secured.

  In actual use, in consideration of the positional deviation between the power transmitting side and power receiving side antenna devices, as in the non-contact power feeding antenna system 10 according to the embodiment of the present invention shown in FIG. The spiral coil 20 is configured to be slightly larger than the other spiral coil 24. In other words, the other spiral coil is configured such that its inner edge is disposed on the inner side of the projection inner edge and its outer edge is disposed on the outer side of the projection outer edge.

  Although the embodiments and examples of the present invention have been described in detail as described above, it will be understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. It will be easy to understand. Therefore, all such modifications are included in the scope of the present invention.

  For example, a term described with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configurations and operations of the non-contact power feeding antenna system and the electronic device are not limited to those described in the embodiments and examples of the present invention, and various modifications can be made.

DESCRIPTION OF SYMBOLS 1 Non-contact electric power feeding system, 10 Non-contact electric power feeding antenna system, 12 Power transmission apparatus (electronic device), 14 Power receiving apparatus (electronic device), 16 Power transmission circuit, 18 Power transmission antenna apparatus, 19, 23 Bending part, 20 Power transmission spiral Coil, 22 Power receiving antenna device, 24 Power receiving spiral coil, 26 Power receiving circuit, 28 Battery, 30 Power source, 119, 123, 519, 523 Curved portion

Claims (6)

A non-contact power feeding antenna system that supplies electric power from a power transmitting antenna device to a power receiving antenna device opposed to the power transmitting antenna device by electromagnetic induction,
A spiral coil for power transmission provided in the antenna apparatus for power transmission and configured by winding a conducting wire;
A power receiving spiral coil provided in the power receiving antenna device and configured by winding a conductive wire;
At least one of the spiral coil for power transmission and the spiral coil for power reception is formed in a non-planar shape, and the positional deviation between the one spiral coil and the other spiral coil is outside of both spiral coils. The inner and outer edges of the projection from the one spiral coil to the other spiral coil are the inner edges of the other spiral coil so that they are within a range of less than ± 2/36 with respect to the length of the major axis of the diameter. The antenna system for non-contact electric power feeding comprised in the arrangement which overlaps with a portion and an outer edge part.   The said other spiral coil is the structure by which the inner edge part is arrange | positioned inside the inner edge part of the said projection, and the outer edge part is arrange | positioned outside the outer edge part of the said projection. Non-contact power supply antenna system.   The non-contact power feeding antenna system according to claim 1, wherein the power transmission spiral coil and the power reception spiral coil are configured in a non-planar shape having substantially the same curvature.   The non-contact power feeding antenna system according to claim 3, wherein the power transmission spiral coil and the power reception spiral coil are configured to have curved portions having substantially the same curvature.   The non-contact power feeding antenna system according to claim 3, wherein the power transmission spiral coil and the power reception spiral coil are configured to have a bent portion that is bent at substantially the same angle.   An electronic device provided with one of a power receiving spiral coil and a power transmitting spiral coil provided in the non-contact power feeding antenna system according to any one of claims 1 to 5.

Images