JP2020145821A - Wireless power transfer sheet - Google Patents

Abstract

To provide a wireless power transfer sheet capable of being cut corresponding to a placement location.SOLUTION: A first-stage power transfer coil unit is configured as a one which has N power transfer coils connected from a first-stage power feed point using wirings with equal length. Then, each of the first-stage power feed points of M first-stage power transfer coil units is connected from a second-stage power feed point using wirings with equal length to configure a second-stage power transfer coil unit. In this wireless power transfer sheet, a power transfer coil in which a wiring from the second-stage power feed point is not cut off, functions by means of power feeding to the second-stage power feed point even when a part of power transfer coils are cut off. Therefore, this invention has a power transfer coil that functions even when the wireless power transfer sheet is cut off corresponding to a placement location.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wireless power transmission sheet.

Conventionally, as this type of wireless power transmission sheet, a sheet in which a plurality of power transmission coils and a plurality of position detection coils are stacked and arranged in a matrix has been proposed (see, for example, Non-Patent Documents 1 and 2). In this sheet, the position of the power receiving device is detected by the position detection coil, and power is supplied to the power transmission coil at the detected position, so that the power receiving device can be powered anywhere on the sheet.

T. Sekitani, M. Takamiya, Y. Noguchi, S. Nakano, Y. Kato, T. Sakurai, and T. Someya, "A large-area wireless power-transmission sheet using printed organic penetrate and plastic memsswitches," Nature materials , vol.6, no.6, pp.413-417, 2007. M. Takamiya, T. Sekitani, Y. Miyamoto, Y. Noguchi, H. Kawaguchi, T. Someya, and T. Sakurai, "Wireless power transmission sheet with organic fets and plastic mems switches," Interna-tional Display Workshop (IDW) ), Sapporo, Japan, pp.95-98, 2007.

However, in the above-mentioned wireless power transmission sheet, power is supplied to the power transmission coils arranged in a matrix by matrix-shaped wiring. Therefore, when one power transmission coil is cut, one of the power transmission coils connected vertically and horizontally to the power transmission coil. The part does not work. Therefore, it becomes difficult to disconnect according to the installation of the wireless power transmission sheet.

A main object of the wireless power transmission sheet of the present invention is to provide a wireless power transmission sheet that can be cut according to the installation location.

The wireless power transmission sheet of the present invention has adopted the following means in order to achieve the above-mentioned main object.

The wireless power transmission sheet of the present invention
A wireless power transmission sheet in which multiple power transmission coils are arranged on a flexible substrate.
Equal-length wiring from the second-stage power supply point to each first-stage power supply point of M first-stage power transmission coil units having N power transmission coils connected by equal-length wiring from the first-stage power supply point. Connected to form a second stage power transmission coil unit,
It is characterized by that.

In the wireless power transmission sheet of the present invention, the first stage power transmission coil unit is configured as having N power transmission coils connected by wiring of equal length from the first stage power transmission point. Then, the second-stage power transmission coil unit is configured by connecting to each of the first-stage power transmission points of the M first-stage power transmission coil units by wiring of the same length from the second-stage power supply point. Therefore, in the second-stage power transmission coil unit, N × M power transmission coils connected by wiring of equal length from the second-stage power supply point are arranged on the flexible substrate. Therefore, by supplying power to the second-stage power feeding point of the second-stage power transmission coil unit, it is possible to supply power to all the power transmission coils. In such a wireless power transmission sheet of the present invention, even if a part of the power transmission coil is cut off, the power transmission coil in which the wiring from the second stage power supply point is not cut functions by supplying power to the second stage power supply point. Therefore, it has a power transmission coil that functions even if it is cut according to the installation location. As a result, a wireless power transmission sheet that can be cut according to the installation location can be obtained. Further, since each power transmission coil is connected from the second stage power feeding point by wiring having the same length, it is possible to suppress the variation in electromagnetic characteristics due to the wiring of each power transmission coil.

In such a wireless power transmission sheet of the present invention, each second-stage power transmission point of M second-stage power transmission coil units is connected to the third-stage power transmission point by wiring of the same length to form a third-stage power transmission coil unit. It may be a thing. That is, the third-stage power transmission coil unit is configured by connecting to each of the second-stage power supply points of the M second-stage power transmission coil units by wiring of the same length from the third-stage power transmission point. In this way, it is possible to assume that N × M × M power transmission coils are arranged on the flexible substrate. Also in this case, since each power transmission coil is connected from the third-stage power feeding point by wiring of the same length, it is possible to suppress the variation in electromagnetic characteristics due to the wiring of each power transmission coil.

In this case, the relationship between the M second-stage power transmission coil units and the third-stage power transmission coil unit may be repeated step by step. That is, the 4th stage power transmission coil unit can be configured by connecting to each 3rd stage power supply point of the M 3rd stage power transmission coil units by wiring of the same length from the 4th stage power transmission point, or further, M pieces. The fifth-stage power transmission coil unit may be configured by connecting to each of the fourth-stage power transmission points of the fourth-stage power transmission coil unit by wiring of the same length from the fifth-stage power supply point. In this way, a wireless power transmission sheet of any size and shape can be obtained by cutting and using it.

In the wireless power transmission sheet of the present invention, the N and the M may be 4. In this case, the wiring from the second stage feeding point to the first feeding point of the four first stage power transmission coil units may be wiring having line symmetry or rotational symmetry. Further, the wiring from the third-stage power feeding point to the second power feeding point of the four second-stage power transmission coil units may be a wiring having line symmetry or rotational symmetry, and further, 4 from the fourth-stage power feeding point. The wiring to the third power feeding point of the three third-stage power transmission coil units may be wiring having line symmetry or rotational symmetry. As the wiring having line symmetry, an “H” -shaped wiring can be used from the second stage feeding point to the first feeding point of the four first stage power transmission coil units. The same applies to the wiring from the upper power supply point to the lower power supply point. In this case, the wiring from the first power feeding point to the four power transmission coils is an I-shaped wiring, from the second stage power feeding point to the first power feeding point of the four first stage power transmission coil units. The wiring may be formed in a path in which the wiring from the first power feeding point to the four power transmission coils is not formed. In this way, excessive wiring in the gap between the power transmission coils can be suppressed. Further, as the wiring having rotational symmetry, a “swastika” -shaped wiring can be used from the second stage feeding point to the first feeding point of the four first stage power transmission coil units. The same applies to the wiring from the upper power supply point to the lower power supply point.

The wireless power transmission sheet of the present invention may be in a state in which some of the N power transmission coils forming the first stage power transmission coil unit are cut off. That is, as described above, a part of the power transmission coil of the wireless power transmission sheet configured as the second-stage power transmission coil unit, the third-stage power transmission coil unit, or the like may be cut out. Further, it may be assumed that a part of the N power transmission coils forming the first stage power transmission coil unit has a value equal to that of the cut power transmission coil. That is, when a part of the power transmission coil of the wireless power transmission sheet configured as the second stage power transmission coil unit or the third stage power transmission coil unit is cut out, the configuration related to the non-functioning power transmission coil is not formed in advance. It may be a coil.

It is a block diagram which shows the outline of the structure of the wireless power transmission sheet 20 of 1st Embodiment. It is a block diagram which shows the outline of the structure of the 1st stage power transmission coil unit 30. It is a block diagram which shows the outline of the structure of the wireless power transmission sheet 20B which cut out the wireless power transmission sheet 20 of 1st Embodiment into a circular shape. It is a block diagram which shows the outline of the structure of the wireless power transmission sheet 20C of a modification. It is a block diagram which shows the outline of the structure of the wireless power transmission sheet 120 of 2nd Embodiment. It is a block diagram which shows the outline of the structure of the wireless power transmission sheet 220 of a modification. It is a block diagram which shows the outline of the structure of the wireless power transmission sheet 320 of the modification. It is a block diagram which shows the outline of the structure of the wireless power transmission sheet 420 of a modification.

Next, a mode for carrying out the present invention will be described. FIG. 1 is a configuration diagram showing an outline of the configuration of the wireless power transmission sheet 20 of the first embodiment. As shown in the figure, the wireless power transmission sheet 20 of the first embodiment has four first-stage power transmission coil units 30 formed in a matrix on a flexible substrate formed of a flexible sheet made of polyimide or polyester. It is configured as a second-stage power transmission coil unit. Each of the four first-stage power transmission coil units 30 has a first-stage power transmission point 36 in the center thereof, and each of the first-stage power transmission coil units 36 is arranged in the center of the four first-stage power transmission coil units 30. It is connected to the two-stage power supply point 40 by an "H" -shaped second-stage power supply wiring 42 having the same length and line symmetry. The second stage power supply point 40 is connected by a power supply line 44 connected to an external power source.

FIG. 2 is a configuration diagram showing an outline of the configuration of the first stage power transmission coil unit 30. As shown in the figure, the first-stage power transmission coil unit 30 includes four power transmission coil units 31 arranged symmetrically in the left-right and vertical directions, and a first-stage power supply point 36 arranged in the center of the four power transmission coil units 31. Be prepared. The power transmission coil unit 31 has a switch 34, a power transmission coil 32, and a capacitor 33 for resonance, which are connected in series, and the switch 34 and the capacitor 33 at both ends thereof are "I" -shaped power supply wirings. It is connected to the first stage power feeding point 36 by 37 and the power feeding wiring 38. The power transmission coil 32, the capacitor 33, the first stage power feeding point 36, and the power feeding wirings 37 and 38 are formed on a flexible substrate by a conductive material (for example, copper). Since the switch 34 can be turned on and off, a relay or a semiconductor switch can be used.

In the wireless power transmission sheet 20 of the first embodiment, as shown in FIG. 1, the power transmission coils 32 are arranged in a matrix at equal intervals, and the “H” -shaped second-stage power supply wiring 42 is “I”. The shape of the power supply wirings 37 and 38 is formed in a path not formed, and the power supply line 44 is formed in a path in which the second stage power supply wiring 42 and the power supply wirings 37 and 38 are not formed. Each power transmission coil 32 is connected by wiring having the same length as seen from the second stage power feeding point 40. As a result, it is possible to suppress variations in electromagnetic characteristics due to differences in the length of the power feeding wiring of each power transmission coil 32.

The wireless power transmission sheet 20 of the first embodiment is not only configured as a second-stage power transmission coil unit, but also has a sensor (position detection coil) for detecting the mounting position of the power receiving device mounted on the sheet. Etc.), but since the detection of the mounting position of the power receiving device is not the core of the present invention, its illustration and description will be omitted. The same applies to the wireless power transmission sheet 120 of the second embodiment and modified examples thereof.

FIG. 3 is a configuration diagram showing an outline of the configuration of the wireless power transmission sheet 20B in which the square-shaped wireless power transmission sheet 20 of the first embodiment shown in FIG. 1 is cut out in a circular shape. As shown in the figure, the wireless power transmission sheet 20B is configured by cutting out about half of the power transmission coils 32 at the four corners. In this wireless power transmission sheet 20B, power can be supplied to 12 power transmission coils 32 other than the power transmission coils 32 at the four corners. As described above, the wireless power transmission sheet 20 of the first embodiment can be cut and used according to the installation location.

The wireless power transmission sheet 20 of the first embodiment described above can be cut and used according to the installation location. Moreover, since each power transmission coil 32 is connected by wiring having the same length as viewed from the second stage power supply point 40, it is possible to suppress variations in electromagnetic characteristics due to differences in the length of the power supply wiring of each power transmission coil 32. be able to.

In the wireless power transmission sheet 20 of the first embodiment, a part of the power transmission coil 32 is cut off and used as a sheet (for example, the wireless power transmission sheet 20B in FIG. 3), but the power transmission coil that does not function in advance is not formed. May be good. For example, as shown in the wireless power transmission sheet 20C of the modified example of FIG. 4, the wireless power transmission sheet 20 of the first embodiment shown in FIG. 1 is formed on a circular flexible substrate except for the power transmission coils 32 at the four corners. It may be configured. This is because the wireless power transmission sheet 20C of FIG. 4 has the same value as the wireless power transmission sheet 20B of FIG. 3 possessed by the power transmission coils 32 at the four corners that do not function due to cutting.

Next, the wireless power transmission sheet 120 of the second embodiment will be described. FIG. 5 is a configuration diagram showing an outline of the configuration of the wireless power transmission sheet 120 of the second embodiment. As shown in the figure, in the wireless power transmission sheet 120 of the second embodiment, four second-stage power transmission coil units 20D in which the power supply line 44 is deleted from the wireless power transmission sheet 20 of the first embodiment are arranged in a matrix. A third-stage power supply point 140 is provided in the center thereof, and the third-stage power supply point 140 and each second-stage power supply point 40 of each second-stage power transmission coil unit 20D are of equal length and have an "H" shape having line symmetry. It is configured as a third-stage power transmission coil unit connected by a third-stage power supply wiring 142. The third stage power supply point 140 is connected by a power supply line 144 connected to an external power source. The "H" -shaped third-stage power supply wiring 142 is formed in a path in which the "H" -shaped second-stage power supply wiring 42 and the "I" -shaped power supply wirings 37 and 38 are not formed, and the power supply line 144 is formed. Is formed in a path in which the second-stage power supply wiring 42, the third-stage power supply wiring 142, and the power supply wirings 37 and 38 are not formed.

The wireless power transmission sheet 120 of the second embodiment described above has the same effect as the wireless power transmission sheet 20 of the first embodiment, that is, the effect that it can be cut and used according to the installation location, and each power transmission. It is possible to achieve the effect of suppressing variations in electromagnetic characteristics due to differences in the length of the power feeding wiring of the coil 32.

In the wireless power transmission sheet 120 of the second embodiment, four second-stage power transmission coil units 20D in which the power supply line 44 is deleted from the wireless power transmission sheet 20 of the first embodiment are arranged in a matrix, and a third is arranged in the center thereof. A stage power supply point 140 is provided, and the third stage power supply point 140 and each second stage power supply point 40 of each second stage power transmission coil unit 20D are of the same length and have line symmetry. It is configured by connecting with 142. Further, as shown in the wireless power transmission sheet 220 of the embodiment of FIG. 6, four third-stage power transmission coil units 120B in which the power supply line 144 is deleted from the wireless power transmission sheet 120 of the second embodiment are arranged in a matrix. A fourth-stage power supply point 240 is provided in the center thereof, and the fourth-stage power supply point 240 and each third-stage power supply point 140 of each third-stage power transmission coil unit 120B have an "H" shape having equal length and line symmetry. It may be connected by the 4th stage power feeding wiring 242 of the above. In this way, the P (n) stage power transmission coil units are arranged in a matrix, the P (n + 1) stage power feeding point is provided in the center thereof, and the P (n + 1) stage power feeding point and each P (n) stage are provided. It is repeated step by step so as to connect each P (n) stage feeding point of the power transmission coil unit with an "H" shaped P (n + 1) stage feeding wiring having equal length and line symmetry. It may constitute a wireless power transmission sheet.

In the wireless power transmission sheet 20 of the first embodiment and the wireless power transmission sheet 120 of the second embodiment, the P (n + 1) stage power feeding point and each P (n) stage of each P (n) stage power transmission coil unit The power feeding points are connected by an "H" -shaped power feeding wiring having the same length and line symmetry. However, as in the wireless power transmission sheet 320 illustrated in FIG. 7, the second-stage power supply point 340 and each first-stage power supply point 36 are provided with the same length and point-symmetrical “swastika” -shaped second-stage power supply wiring 342. It may be connected by. In this case, the first-stage power transmission coil unit 30 in the upper left of the figure is used so that the “I” -shaped power supply wirings 37 and 38 of the first-stage power transmission coil unit 30 and the second-stage power transmission coil 342 do not have the same path. The first stage power transmission coil unit 30 at the lower left is rotated 90 degrees. In this case, a part of the power supply line 344 connected to the external power supply is formed in the same path as the second stage power supply wiring 342. Further, as shown in the wireless power transmission sheet 420 illustrated in FIG. 8, four second-stage power transmission coil units 320B in which the power supply line 344 is deleted from the wireless power transmission sheet 320 in FIG. 7 are arranged in a matrix, and the center thereof. A third-stage power supply point 440 is provided in the above, and the third-stage power supply point 340 and each second-stage power supply point 340 of each second-stage power transmission coil unit 320B are equal in length and point-symmetrical in a "square" shape. It may be connected by the wiring 442. In this way, the Q (n) stage power transmission coil units are arranged in a matrix, the Q (n + 1) stage power feeding point is provided in the center thereof, and the Q (n + 1) stage power feeding point and each Q (n) stage are provided. Wireless power is repeated step by step so that each Q (n) stage power feeding point of the power transmission coil unit is connected by a point-symmetrical "卍" -shaped Q (n + 1) stage power feeding wiring. It may constitute a transmission sheet.

In the wireless power transmission sheet 20 of the first embodiment, the “H” -shaped second-stage power feeding wiring 42 is formed in a path in which the “I” -shaped power feeding wirings 37 and 38 are not formed. Further, in the wireless power transmission sheet 120 of the second embodiment, the "H" -shaped third-stage power supply wiring 142 is provided with the "H" -shaped second-stage power supply wiring 42 and the "I" -shaped power supply wiring 37 and 38. It was formed in a pathway that was not formed. However, the "H" -shaped second-stage power supply wiring 42 may be formed in the path where the "I" -shaped power supply wirings 37 and 38 are formed, or the "H" -shaped third-stage power supply wiring 142 may be formed. , The “H” -shaped second-stage power supply wiring 42 and the “I” -shaped power supply wiring 37, 38 may be formed in the path formed.

In the wireless power transmission sheet 20 of the first embodiment and the wireless power transmission sheet 120 of the second embodiment, the four power transmission coil units 31 are arranged so as to be symmetrical in the vertical and horizontal directions, and the “I” -shaped power supply wiring 37, It was assumed that 38 was connected to the first stage power feeding point 36. However, the four power transmission coil units 31 may be arranged so as not to be symmetrical vertically or horizontally, and may be connected to the first stage power feeding point by a power feeding wiring that does not have an “I” shape.

In the wireless power transmission sheet 20 of the first embodiment and the wireless power transmission sheet 120 of the second embodiment, the first stage power transmission coil unit 30 is composed of four power transmission coil units 31. However, the first stage power transmission coil unit may be composed of two or three power transmission coil units or five or more power transmission coil units. Further, in the wireless power transmission sheet 20 of the first embodiment and the wireless power transmission sheet 120 of the second embodiment, the second stage power transmission coil unit 20D is composed of four first stage power transmission coil units 30. However, the second-stage power transmission coil unit may be composed of two or three first-stage power transmission coil units or five or more second-stage power transmission coil units. That is, the L (n + 1) stage power transmission coil unit may be composed of a plurality of L (n) stage power transmission coil units.

Although the embodiments for carrying out the present invention have been described above with reference to Examples, the present invention is not limited to these Examples, and various embodiments are used without departing from the gist of the present invention. Of course, it can be done.

The present invention can be used in the manufacturing industry of wireless power transmission sheets and the like.

20, 20B, 20C, 120, 220, 320, 420 Wireless power transmission sheet, 20D, 320B 2nd stage power transmission coil unit, 30 1st stage power transmission coil unit, 31 power transmission coil unit, 32 power transmission coil, 33 condenser, 34 switch , 36 1st stage power supply point, 37,38 power supply wiring, 40,340 2nd stage power supply point, 42,342 2nd stage power supply wiring, 44,144,244 power supply line, 140,440 3rd stage power supply point, 142 , 442 3rd stage power supply wiring, 240 4th stage power supply point, 242 4th stage power supply wiring.

Claims (8)

A wireless power transmission sheet in which multiple power transmission coils are arranged on a flexible substrate.
Equal-length wiring from the second-stage power supply point to each first-stage power supply point of M first-stage power transmission coil units having N power transmission coils connected by equal-length wiring from the first-stage power supply point. Connected to form a second stage power transmission coil unit,
A wireless power transmission sheet characterized by that. The wireless power transmission sheet according to claim 1.
Each second-stage power transmission coil unit of M second-stage power transmission coil units was connected to each second-stage power transmission point by wiring of the same length from the third-stage power supply point to form a third-stage power transmission coil unit.
Wireless power transfer sheet. The wireless power transmission sheet according to claim 2.
The relationship between the M second-stage power transmission coil units and the third-stage power transmission coil unit is repeated step by step.
Wireless power transfer sheet. The wireless power transmission sheet according to any one of claims 1 to 3.
The N and the M are 4.
Wireless power transfer sheet. The wireless power transmission sheet according to claim 4.
The wiring from the second stage feeding point to the first feeding point of the four first stage power transmission coil units is a wiring having line symmetry or rotational symmetry.
Wireless power transfer sheet. The wireless power transmission sheet according to claim 5.
The wiring from the second stage power feeding point to the first power feeding point of the four first stage power transmission coil units is an H-shaped wiring.
Wireless power transfer sheet. The wireless power transmission sheet according to claim 6.
The wiring from the first power feeding point to the four power transmission coils is an I-shaped wiring.
The wiring from the second stage power feeding point to the first power feeding point of the four first stage power transmission coil units is formed in a path in which the wiring from the first power feeding point to the four power transmission coils is not formed. ing,
Wireless power transfer sheet. The wireless power transmission sheet according to any one of claims 1 to 7.
A part of the N power transmission coils forming the first stage power transmission coil unit is cut off.
Wireless power transfer sheet.

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