JP2010259171A - Non-contact transmission apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-contact transmission apparatus capable of transmission and reception with the same power or signal strength as in ordinary use even when a displacement occurs between coils. <P>SOLUTION: The non-contact transmission apparatus includes: a primary coil 1 for transmitting a power or a signal by magnetic coupling; and a secondary coil 2 that is arranged opposite to the primary coil 1 and receives the power or the signal from the primary coil 1 by magnetic coupling. The inside diameter r1 of the primary coil 1 and the inside diameter r2 of the secondary coil 2 are so set that the following is implemented: the coefficient k of coupling between the coils in a reference pattern on which the position of the secondary coil 2 is based relative to the primary coil 1 is identical with the coefficient k of coupling between the coils in a deviated pattern in which the position of the secondary coil 2 relative to the primary coil 1 is different from that in the reference pattern. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a contactless transmission apparatus that transmits and receives power or an electrical signal in a contactless manner via at least one pair of coils.

  In recent years, non-contact transmission devices that send and receive power or electric signals in a non-contact manner between two electrical devices, such as charging a mobile terminal in a non-contact manner by placing the mobile terminal on a charger, have been spotlighted. . In such a non-contact transmission device, when a high frequency signal is applied to the primary side coil of one electrical device, an external magnetic field is generated and an induced voltage is generated in the secondary side coil of the other electrical device. Then, by rectifying the induced voltage with a diode or the like, the secondary battery built in the other electric device can be charged. In addition, signals can be transmitted bidirectionally without contact by magnetic coupling of the primary side coil and the secondary side coil.

  In the non-contact transmission device as described above, the coupling coefficient between the primary side coil and the secondary side coil changes due to, for example, the relative position of the secondary side coil deviating from the primary side coil. There was a problem that the transmission efficiency of the signal was lowered. As a solution to this problem, there are those disclosed in Patent Documents 1 and 2, for example. In the inventions described in Patent Documents 1 and 2, by determining the ratio of the inner diameter and the outer diameter of each of the primary side coil and the secondary side coil, or by determining the mutual relationship between the inner diameter and the outer diameter of each coil, Charging efficiency and signal transmission efficiency when the relative displacement of the secondary coil with respect to the primary coil occurs are increased.

Japanese Patent No. 3887828 JP 2008-289241 A

  However, in the above-described conventional example, although the charging efficiency and signal transmission efficiency when the relative displacement of the secondary coil with respect to the primary coil occurs can be increased, there is no displacement between the coils. It is only possible to transmit and receive electric power or electric signals with charging efficiency and signal transmission efficiency within the range allowed for normal use. Therefore, transmission / reception cannot be performed with the same power or signal strength when the positional deviation occurs between the coils and during normal use, and there is a concern that the reliability of power transmission / reception and signal transmission / reception may be reduced.

  The present invention has been made in view of the above points, and provides a non-contact transmission device capable of transmitting and receiving with the same power or signal intensity as in normal use even when a positional deviation occurs between coils. For the purpose.

  In order to achieve the above object, the invention according to claim 1 is arranged such that a primary side coil for transmitting power or an electric signal by magnetic coupling and a primary side coil are arranged opposite to each other, and power from the primary side coil by magnetic coupling. Or a secondary coil that receives an electrical signal, and a reference pattern serving as a reference for the position of the secondary coil with respect to the primary coil, and a position of the secondary coil with respect to the primary coil that differs from the reference pattern 1 to 1 A plurality of shift patterns, and the inner diameters of the primary side coil and the secondary side coil so that the coupling coefficient between the primary side coil and the secondary side coil is the same between the reference pattern and each shift pattern. It is characterized in that at least any one of an outer diameter and a relative position of each coil on a plane parallel to the opposing surface of each coil is set with respect to the inclination of the primary side coil with respect to the secondary side coil.

  The invention of claim 2 is the invention of claim 1, wherein the inner diameter and the outer diameter of the primary side coil and the secondary side coil are constant, and the inclination of the primary side coil with respect to the secondary side coil is constant, When the relative position of each coil on a plane parallel to the opposing surface of each coil of each shift pattern is different from the reference pattern, the primary coil and the secondary coil between the reference pattern and each shift pattern A plurality of primary side coils or secondary side coils are arranged close to each other on the same plane so that the coupling coefficient between them is the same.

  According to a third aspect of the present invention, in the first aspect of the invention, the inner diameter and the outer diameter of the primary side coil and the secondary side coil are constant, and the inclination of the secondary side coil with respect to the primary side coil of each shift pattern is When different from the reference pattern, each coil on a plane parallel to the opposing surface of each coil so that the coupling coefficient between the primary side coil and the secondary side coil is the same between the reference pattern and each shift pattern. A positioning means for positioning at a predetermined position is provided.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the shift pattern includes a case where the inner diameter or the outer diameter of at least one of the primary side coil or the secondary side coil is different from the reference pattern. When the relative position of each coil on a plane parallel to the opposing surface is constant, and the inner diameter or outer diameter of at least one of the primary side coil or secondary side coil of each shift pattern is different from the reference pattern In order to fix the one coil with a predetermined inclination with respect to the other coil so that the coupling coefficient between the primary coil and the secondary coil is the same between the reference pattern and each shift pattern A fixing means is provided.

  According to the present invention, even when a positional deviation occurs between the primary side coil and the secondary side coil, the same coupling coefficient between the coils as in normal use in which no positional deviation occurs can be obtained. Therefore, in any case, transmission / reception can be performed with the same power or signal strength, and therefore it is possible to prevent the reliability of power transmission / reception and signal transmission / reception from being lowered.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of the non-contact transmission apparatus which concerns on this invention, (a) is a figure which shows the positional relationship of each coil in a reference | standard pattern, (b) is a figure which shows the positional relationship of each coil in a shift | offset | difference pattern. . (A)-(c) is a correlation diagram of the internal diameter of a primary side coil, and a coupling coefficient when changing the internal diameter of the secondary side coil same as the above variously. It is a figure which shows Embodiment 2 of the non-contact transmission apparatus which concerns on this invention, (a) is a top view of a primary side coil, (b), (c) is a side cross section of a primary side coil and a secondary side coil. FIG. It is a figure which shows Embodiment 3 of the non-contact transmission apparatus which concerns on this invention, (a) is a side view of a 1st apparatus main body, (b), (c) is a 2nd apparatus main body in a 1st apparatus main body. It is a side view at the time of fixing. It is a figure which shows Embodiment 4 of the non-contact transmission apparatus which concerns on this invention, (a) is a side view which shows the positional relationship of each coil in case the internal diameter of a secondary side coil is large, (b) is a secondary side coil. It is a side view which shows the positional relationship of each coil when the internal diameter of is small.

(Embodiment 1)
Hereinafter, Embodiment 1 of the non-contact transmission apparatus according to the present invention will be described with reference to the drawings. In the following description, the top and bottom in the side sectional view of FIG. In this embodiment, as shown in FIGS. 1A and 1B, a primary coil 1 that sends electric power or an electric signal by magnetic coupling and a primary coil 1 are arranged opposite to each other and 1 by magnetic coupling. A secondary coil 2 that receives electric power or an electric signal from the secondary coil 1. In the present embodiment, the coupling coefficient k between the coils in the reference pattern (see FIG. 1A) serving as a reference for the position of the secondary coil 2 with respect to the primary coil 1 and 2 for the primary coil 1. The inner diameter r1 of the primary coil 1 and the secondary coil 2 are set so that the coupling coefficient k between the coils in the shift pattern (see FIG. 1B) where the position of the secondary coil 2 is different from the reference pattern is the same. This is characterized by setting the inner diameter r2.

  The primary coil 1 is a substantially annular air-core coil having an inner diameter r1 and an outer diameter R1, and the upper surface thereof serves as a power transmission surface for transmitting electric power or an electric signal. In addition, a substantially disk-shaped magnetic sheet 10 having an outer diameter dimension substantially the same as the outer diameter dimension of the primary coil 1 is provided on the lower surface opposite to the power transmission surface, and the inductance of the primary coil 1 is provided. Has increased. The secondary coil 2 is a substantially annular air-core coil having an inner diameter r2 and an outer diameter R2, and its lower surface serves as a power receiving surface that receives electric power or an electric signal sent from the primary coil 1. Further, a substantially disk-shaped magnetic sheet 20 having an outer diameter dimension substantially the same as the outer diameter dimension of the secondary coil 2 is provided on the upper surface opposite to the power receiving surface, and the inductance of the secondary coil is reduced. It is getting bigger.

  Hereinafter, the reference pattern and the shift pattern in the present embodiment will be described. In the reference pattern, the central axis of the primary coil 1 and the central axis of the secondary coil 2 are located on the same straight line, and the distance d between the primary coil 1 and the secondary coil 2 is 5 3 mm. In the shift pattern, the center axis of the secondary coil 2 is shifted by 6 mm from the center axis of the primary coil 1, and the distance d between the primary coil 1 and the secondary coil 2 is 3.3 mm. To do. The other parameters are the same for the reference pattern and the shift pattern. The outer diameter R1 of the primary coil 1 is 30 mm, and the thickness dimension t1 of the primary coil 1 is 0.17 mm. The outer diameter R2 is set to 15 mm, the thickness dimension t2 of the secondary coil 2 is set to 0.3 mm, the thickness dimension t10 of the magnetic sheet 10 is set to 1 mm, and the thickness dimension t20 of the magnetic sheet 20 is set to 0.02 mm. The power transmission surface of the primary coil 1 and the power reception surface of the secondary coil 2 are parallel to each other, and the secondary coil 2 is not inclined with respect to the primary coil 1.

  Here, when the inner diameter r2 of the secondary coil 2 is 3 mm, 6 mm, and 9 mm, the correlation diagram between the inner diameter r1 of the primary coil 1 and the coupling coefficient k between the coils is shown in FIG. ) To (c). As shown in the figure, in any case, there is an inner diameter r1 of the primary coil 1 in which the coupling coefficient k is the same between the reference pattern and the shift pattern.

  Thus, when the inner diameter r1 of the primary coil 1 and the inner diameter r2 of the secondary coil 2 are set appropriately, a positional deviation occurs between the primary coil 1 and the secondary coil 2. In this case, since the coupling coefficient k between the coils can be the same as in normal use in which no positional deviation has occurred, in either case, transmission / reception can be performed with the same power or signal strength. It is possible to prevent the reliability of power reception and signal transmission / reception from deteriorating.

  The reference pattern and the shift pattern in this embodiment are an example of the relative positional relationship between the primary side coil 1 and the secondary side coil, and are not limited to the pattern. Any pattern may be used as long as the coupling coefficient is the same for the shift pattern.

(Embodiment 2)
Hereinafter, Embodiment 2 of the non-contact transmission apparatus according to the present invention will be described with reference to the drawings. As shown in FIG. 3A, the present embodiment is characterized in that a plurality (four in the drawing) of primary coils 1 are arranged close to each other on the same plane. In this embodiment, the inner diameter and outer diameter of the primary coil 1, the inner diameter and outer diameter of the secondary coil 2, and the distance between the primary coil 1 and the secondary coil 2 are constant. To do. The power transmission surface of the primary coil 1 and the power reception surface of the secondary coil 2 are parallel to each other, and the secondary coil 2 is not inclined with respect to the primary coil 1.

  Here, the reference pattern (FIG. 3B) shows a case where the central axis of any one primary coil 1 and the central axis of the secondary coil 2 among the plurality of primary coils 1 are located on the same straight line. ))), And a case where the secondary coil 2 is located across any two primary coils 1 adjacent to each other is defined as a shift pattern (see FIG. 3C). As shown in FIGS. 3B and 3C, the ratio of the magnetic lines generated in the primary coil 1 in the reference pattern interlink with the secondary coil 2, and the primary pattern 1 generated in the shift pattern. The rate at which the lines of magnetic force are linked to the secondary coil 2 is the same. That is, since the coupling coefficient between the coils is the same between the reference pattern and the shift pattern, the same effect as in the first embodiment can be obtained.

  In addition, in this embodiment, since the secondary coil 2 can be arranged at any position within the region where the primary coil 1 is arranged, the same coupling coefficient as that of the reference pattern can be obtained. The allowable range of positional deviation of the secondary coil 2 with respect to the pattern can be expanded.

  In the present embodiment, the plurality of primary coils 1 are arranged close to each other. However, instead of the primary coil 1, a plurality of secondary coils 2 may be arranged close to each other. Even in this case, the same effect as that of the first embodiment can be obtained, and the same position as the reference pattern can be obtained regardless of the position of the primary coil 1 as long as it is within the region where the secondary coil 2 is disposed. Therefore, the allowable range of positional deviation of the primary coil 1 with respect to the reference pattern can be expanded.

(Embodiment 3)
Hereinafter, Embodiment 3 of the contactless transmission apparatus according to the present invention will be described with reference to the drawings. As shown in FIG. 4A, the present embodiment is characterized by the shape of the first device main body 3 that incorporates the primary coil 1, and the second device main body 4 that incorporates the secondary coil 2. Positioning means for fixing the at a predetermined position is provided. In this embodiment, the inner diameter and outer diameter of the primary coil 1, the inner diameter and outer diameter of the secondary coil 2, and the distance between the primary coil 1 and the secondary coil 2 are constant. To do. Further, as a combination of the first device main body 3 and the second device main body 4, a combination of a portable terminal and a charger thereof is conceivable, but is not limited to the combination, and the primary coil 1 and the secondary coil As long as it has the side coil 2, it may be a combination of other devices.

  As positioning means, the flat surface 30 having a predetermined inclination with respect to the surface on which the first device body 1 is placed, and the second device body 4 is placed on the same plane as the flat surface 30. A first positioning means comprising a concave portion 31 having a substantially right-angled triangular cross section, a flat surface 32 parallel to the surface on which the first device body 1 is placed, and a second surface on the same plane as the flat surface 32. There is a second positioning means comprising a concave portion 33 having a substantially right-angled triangular cross section that is recessed so that the apparatus main body 4 is placed.

  When the second device main body 4 is fixed to the first device main body 3 by the first positioning means, as shown in FIG. 4B, the corner on one end side in the longitudinal direction of the second device main body 4 is used. The part is fitted into the corner of the recess 31 and the other end is placed on the flat surface 30. When the second device main body 4 is fixed to the first device main body 3 by the second positioning means, as shown in FIG. 4C, the corner on one end side in the longitudinal direction of the second device main body 4 is used. The part is fitted into the corner of the recess 33 and the other end is placed on the flat surface 32. When the second device main body 4 is fixed to the first device main body 3 by the first positioning means, the secondary coil 2 is positioned so that its center is deviated from the center of the primary coil 1. On the other hand, when the second device main body 4 is fixed to the first device main body 3 by the second positioning means, the center of the primary coil 1 and the center of the secondary coil 2 are positioned on the same straight line. To do.

  Here, the case where the power transmission surface of the primary coil 1 and the power reception surface of the secondary coil 2 are parallel is defined as a reference pattern (see FIG. 4B), and 2 for the power transmission surface of the primary coil 1. A case where the power receiving surface of the secondary coil 2 is inclined at a predetermined angle is referred to as a shift pattern (see FIG. 4C). As shown in FIGS. 4B and 4C, the second device body 4 is fixed to the first device body 3 by the first positioning means in the reference pattern, and the second positioning means in the shift pattern. By fixing the second device main body 4 to the first device main body 3, the coupling coefficient between the coils becomes the same in the reference pattern and the shift pattern, so that the same effect as in the first embodiment can be obtained. .

  The reference pattern and the shift pattern in the present embodiment are an example of the relative positional relationship between the primary side coil 1 and the secondary side coil, and are not limited to the pattern. Further, the configuration of the positioning means is not necessarily limited to the configuration of the present embodiment, and any configuration may be used as long as the coupling coefficient is the same between the reference pattern and the shift pattern. .

(Embodiment 4)
Hereinafter, Embodiment 4 of the non-contact transmission apparatus according to the present invention will be described with reference to the drawings. In the present embodiment, as shown in FIGS. 5A and 5B, tilt fixing means for fixing the secondary coil 2 to the third device body 5 with a predetermined tilt with respect to the primary coil 1 is provided. It is characterized by the provision. In the present embodiment, the inner and outer diameters of the primary coil 1 and the distance between the primary coil 1 and the secondary coil 2 are constant, and the center of the primary coil 1 and the secondary side It is assumed that the center of the coil 2 is located on the same straight line. The combination of the first device body 3 and the second device body 4 is the same as that in the third embodiment.

  Here, the second device main body 4 incorporating the secondary coil 2 having an outer diameter smaller than the outer diameter of the primary coil 1, and the outer dimensions substantially the same as the outer diameter of the primary coil 1. Consider a case where the third device body 5 incorporating the secondary coil 2 is placed on the first device body 1. Hereinafter, the case where the second device body 4 is placed on the first device body 1 is referred to as a reference pattern (see FIG. 5A), and the third device body 5 is placed on the first device body 1. This case is referred to as a shift pattern (see FIG. 5B). If the power transmission surface of the primary coil 1 and the power reception surface of the secondary coil 2 are parallel to each other in any pattern, the coupling coefficient between the coils differs between the reference pattern and the shift pattern. Therefore, as shown in FIG. 5B, the reference pattern is obtained by fixing the secondary side coil 2 to the primary side coil 1 with a predetermined inclination in the third device body 5 using the inclination fixing means. The coupling coefficient between the coils can be made the same between the shift pattern and the shift pattern. Thus, a plurality of device main bodies (second device main body 4 and third device main body 5 in the present embodiment) having the secondary side coils 2 having different diameters are connected to the same device main body (in the present embodiment, the first device main body 4 and the third device main body 5). Even when used for a single device main body 3), transmission and reception can be performed with the same power or signal strength. Therefore, it is possible to prevent power transmission and reception and signal transmission and reception from being reduced in reliability.

  In the present embodiment, the tilt fixing means is provided in the second device body 4. However, the primary coil 1 is fixed to the first device body 3 with a predetermined tilt with respect to the secondary coil 2. An inclination fixing means may be provided. Even in this case, the same effects as described above can be obtained.

1 Primary coil 2 Secondary coil

Claims (4)

  A primary side coil that transmits electric power or an electric signal by magnetic coupling, and a secondary coil that is disposed opposite to the primary side coil and receives electric power or an electric signal from the primary side coil by magnetic coupling. A reference pattern that serves as a reference for the position of the secondary coil with respect to the side coil, and one or a plurality of shift patterns in which the position of the secondary coil with respect to the primary coil differs from the reference pattern. Between the primary coil and the secondary coil so that the coupling coefficient between the primary coil and the secondary coil is the same, and on the plane parallel to the opposing surface of each coil. A non-contact transmission device characterized in that at least one of the relative positions of the coils and the inclination of the primary coil to the secondary coil is set.   The inner diameter and outer diameter of the primary side coil and the secondary side coil are constant, and the inclination of the primary side coil with respect to the secondary side coil is constant, and is parallel to the opposing surface of each coil of each shift pattern. When the relative position of each coil on the plane is different from the reference pattern, the coupling coefficient between the primary side coil and the secondary side coil is the same on the same plane between the reference pattern and each shift pattern. The non-contact transmission device according to claim 1, wherein a plurality of primary side coils or secondary side coils are arranged close to each other.   When the inner diameter and the outer diameter of the primary side coil and the secondary side coil are constant and the inclination of the secondary side coil with respect to the primary side coil of each deviation pattern is different from the reference pattern, the reference pattern and each deviation pattern Positioning means for positioning each coil at a predetermined position on a plane parallel to the opposing surface of each coil so that the coupling coefficient between the primary coil and the secondary coil is the same between The non-contact transmission apparatus according to claim 1.   The deviation pattern includes a case where the inner diameter or the outer diameter of at least one of the primary side coil or the secondary side coil is different from the reference pattern, and the relative positions of the coils on a plane parallel to the opposing surface of each coil. When the general position is constant and the inner diameter or the outer diameter of at least one of the primary side coil or the secondary side coil of each deviation pattern is different from the reference pattern, 1 between the reference pattern and each deviation pattern 2. An inclination fixing means for fixing one of the coils with a predetermined inclination with respect to the other coil so that the coupling coefficient between the secondary coil and the secondary coil is the same. The contactless transmission device described.

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