JP7213538B2 - wireless power transfer sheet - Google Patents

Description

Article 30, Paragraph 2 of the Patent Law applies Publisher name The Institute of Electronics, Information and Communication Engineers Publication name The Institute of Electronics, Information and Communication Engineers 2018 General Conference DVD Proceedings Publication date March 6, 2018 Meeting name The Institute of Electronics, Information and Communication Engineers 2018 General Conference Tournament Date March 21, 2018 Website address https://dl. acm. org/citation. cfm? id=3287068 Website publication date December 27, 2018 Website address https://www. researchgate. net/publication/329954327_A_Cuttable_Wireless_Power_Transfer_Sheet Website publication date January 8, 2019 Website address https://dl. acm. org/citation. cfm? id=3267570 Date posted on the website October 8, 2018 Meeting name ACM Ubicomp 2018 Date October 9, 2018 Website address https://www. youtube. com/watch? v=eBqJG65DhPQ Website posting date January 6, 2019 Website address http://www. a kg. t. u-tokyo. ac. jp/archives/1891 Website publication date January 7, 2019 Exhibition name ERATO Kawahara Project Forum Enable Toward the realization of a universal information network Date September 29, 2018 Exhibition name 2018 MLAB/ UIN Research Forum Date November 13, 2018 Broadcast program name World Business Satellite Trend Egg Broadcast date January 16, 2019 Broadcast program name Mezamashi TV Mezamashi SEVEN Broadcast date January 23, 2019 Publisher name Nikkei Sangyo Newspaper company Publication name Nikkei Sangyo Shimbun Date of issue January 11, 2019 Publisher name Sankei Shimbun website address https://www. sankei. com/life/news/190111/lif1901110005-n1. html? fbclid=IwAR27DltyGUvuTqj_rHVpe5otTdF Rn3ASb_ Jc7TVnskQ2mUkpaXhAn3TS Date published on website January 11, 2019

Application of Article 30, Paragraph 2 of the Patent Act Publisher name Asahi Shimbun Publication name Asahi Shimbun Date of issue January 21, 2019 Publisher name Asahi Shimbun Website address https://www. Asahi. com/articles/ASM193JCKM19ULBJ005. html Date posted on the website January 21, 2019 Name of the meeting Towards the realization of a universal information network Professor Yoshihiro Kawahara Lecture Date October 4, 2018 Website address https://www. jst. go. jp/pr/announce/20190107-2/index. html Website publication date January 7, 2019

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 seat, the position of the power receiving device is detected by the position detection coil, and power is supplied to the power transmitting coil at the detected position, thereby enabling power to be supplied to the power receiving device anywhere on the seat.

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 transistors 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," International Display Workshop (IDW) ), Sapporo, Japan, pp.95-98, 2007.

However, in the wireless power transmission sheet described above, power is supplied to the power transmission coils arranged in a matrix through matrix-shaped wiring. department ceases to function. Therefore, it becomes difficult to cut the wireless power transmission sheet according to the installation.

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 employs the following means in order to achieve the above main object.

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

In the wireless power transmission sheet of the present invention, the first-stage power transmission coil unit is configured to have N power transmission coils connected from the first-stage power supply point by wires of equal length. Then, a second-stage power transmission coil unit is configured by connecting each first-stage power supply point of the M first-stage power transmission coil units to the second-stage power supply point with wires of equal length. Therefore, in the second-stage power transmission coil unit, N×M power transmission coils connected from the second-stage power supply point by wires of equal length are arranged on the flexible substrate. Therefore, by supplying power to the second-stage power supply point of the second-stage power transmission coil unit, power can be supplied to all the power transmission coils. In such a wireless power transmission sheet of the present invention, even if some of the power transmission coils are cut off, the power transmission coils whose wiring from the second-stage power supply point is not cut will function by supplying power to the second-stage power supply point. Therefore, even if it is cut according to the installation location, it has a functioning power transmission coil. As a result, the wireless power transmission sheet can be cut according to the installation location. In addition, since each power transmission coil is connected to the second-stage power supply point by wiring of equal length, it is possible to suppress variations in electromagnetic characteristics due to the wiring of each power transmission coil.

In the wireless power transmission sheet of the present invention, the third-stage power transmission coil unit is formed by connecting each second-stage power supply point of the M second-stage power transmission coil units to each second-stage power supply point by wiring of equal length from the third-stage power supply point. It can be a thing. That is, the third-stage power transmission coil unit is configured by connecting each second-stage power supply point of the M second-stage power transmission coil units to the third-stage power supply point with wires of equal length. In this way, N×M×M power transmitting coils can be arranged on the flexible substrate. Also in this case, each power transmission coil is connected to the third-stage power supply point by wiring of equal length, so that it is possible to suppress variations 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 units may be repeated stepwise. That is, the fourth-stage power transmission coil unit is configured by connecting the fourth-stage power supply point to each third-stage power supply point of the M third-stage power supply coil units with wires of equal length, or furthermore, M number of third-stage power supply coil units The fifth-stage power transmission coil unit may be configured by connecting to each fourth-stage power supply point of the fourth-stage power transmission coil unit with wires of equal 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.

In the wireless power transmission sheet of the present invention, N and M may be four. In this case, wiring from the second-stage feeding point to the first feeding points 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 feeding point to the second feeding points of the four second-stage power transmitting coil units may have line symmetry or rotational symmetry. The wiring up to the third feeding point of the third-stage power transmitting coil units may be wiring having line symmetry or rotational symmetry. As wiring having line symmetry, it is possible to use "H"-shaped wiring from the second-stage feeding point to the first feeding points of the four first-stage power transmission coil units. The same applies to the wiring from the power supply point on the higher stage to the power supply point on the lower stage. In this case, the wiring from the first power feeding point to the four power transmitting coils is an I-shaped wiring, and the wiring from the second power feeding point to the first power feeding points of the four first power transmitting coil units. Wiring may be formed on a path where no wiring is formed from the first power supply point to the four power transmission coils. By doing so, it is possible to suppress excessive wiring in the gaps between the power transmission coils. Also, as the wiring having rotational symmetry, a swastika-shaped wiring can be used from the second-stage power supply point to the first power-supply points of the four first-stage power transmission coil units. The same applies to the wiring from the power supply point on the higher stage to the power supply point on the lower stage.

In the wireless power transmission sheet of the present invention, some of the N power transmission coils forming the first power transmission coil unit may be cut off. That is, as described above, the power transmission coils may be partially cut out from the wireless power transmission sheet configured as the second power transmission coil unit, the third power transmission coil unit, or the like. Further, the state may be equivalent to a state in which some of the N power transmission coils forming the first-stage power transmission coil unit are disconnected. That is, when a part of the power transmission coils 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 is cut, a configuration related to the non-functioning power transmission coils is not formed in advance. It is also possible to use

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the outline of a structure of the wireless power transmission sheet|seat 20 of 1st Embodiment. 3 is a configuration diagram showing an outline of the configuration of a first-stage power transmission coil unit 30; FIG. FIG. 3 is a configuration diagram showing an outline of the configuration of a wireless power transmission sheet 20B obtained by cutting the wireless power transmission sheet 20 of the first embodiment into a circular shape. It is a block diagram which shows the outline of a structure of wireless power transmission sheet|seat 20C of a modification. It is a block diagram which shows the outline of a structure of the wireless power transmission sheet|seat 120 of 2nd Embodiment. It is a block diagram which shows the outline of a structure of the wireless power transmission sheet|seat 220 of a modification. It is a block diagram which shows the outline of a structure of the wireless power transmission sheet|seat 320 of a modification. It is a block diagram which shows the outline of a structure of the wireless power transmission sheet|seat 420 of a modification.

Next, the form for implementing this invention is demonstrated. FIG. 1 is a configuration diagram showing the 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 in a flexible sheet shape from 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 feeding point 36 at its center, and each first-stage power feeding point 36 is a first power supply point arranged in the center of the four first-stage power transmission coil units 30 . It is connected to the second-stage feeding point 40 by an "H"-shaped second-stage feeding wiring 42 having the same length and line symmetry. The second stage feed point 40 is connected by a feed line 44 that connects to an external power supply.

FIG. 2 is a configuration diagram showing an outline of the configuration of the first-stage power transmission coil unit 30. As shown in FIG. As illustrated, the first-stage power transmission coil unit 30 includes four power transmission coil units 31 arranged symmetrically in the horizontal and vertical directions, and a first power supply point 36 arranged in the center of the four power transmission coil units 31. Prepare. 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. 37 and feed wiring 38 to the first stage feed point 36 . The power transmission coil 32, the capacitor 33, the first stage power supply point 36, and the power supply wirings 37 and 38 are formed on a flexible substrate with a conductive material (eg, copper). Since the switch 34 only needs to 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 feeder lines 37 and 38 are formed along a path where the shaped feeder lines 37 and 38 are not formed, and the feeder line 44 is formed along a path where the second stage feeder line 42 and the feeder lines 37 and 38 are not formed. The power transmission coils 32 are connected by wires of equal length when viewed from the second stage power supply point 40 . As a result, variations in electromagnetic characteristics due to different lengths of the power supply wires of the power transmission coils 32 can be suppressed.

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

FIG. 3 is a configuration diagram showing an outline of the configuration of a wireless power transmission sheet 20B obtained by cutting the square wireless power transmission sheet 20 of the first embodiment shown in FIG. 1 into a circular shape. As illustrated, the wireless power transmission sheet 20B is configured by cutting off 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. Thus, 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. In addition, since the power transmission coils 32 are connected by wires having equal lengths when viewed from the second-stage power supply point 40, variations in electromagnetic characteristics due to different lengths of the power supply wires of the power transmission coils 32 are suppressed. be able to.

In the wireless power transmission sheet 20 of the first embodiment, a sheet (for example, the wireless power transmission sheet 20B in FIG. 3) from which a part of the power transmission coils 32 is cut is used, but it is assumed that the non-functioning power transmission coils are not formed in advance. good too. For example, as shown in a wireless power transmission sheet 20C of a modified example in FIG. may be configured. This is because the wireless power transmission sheet 20C in FIG. 4 is equivalent to the wireless power transmission sheet 20B in FIG.

Next, the wireless power transmission sheet 120 of 2nd Embodiment is demonstrated. FIG. 5 is a configuration diagram showing the outline of the configuration of the wireless power transmission sheet 120 of the second embodiment. As shown in the figure, the wireless power transmission sheet 120 of the second embodiment has four second-stage power transmission coil units 20D arranged in a matrix by removing the power supply line 44 from the wireless power transmission sheet 20 of the first embodiment, A third-stage power supply point 140 is provided at the center, 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 formed in an "H" shape having equal length and 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 that connects to an external power supply. The “H”-shaped third-stage power supply wiring 142 is formed in a path where the “H”-shaped second-stage power supply wiring 42 and the “I”-shaped power supply wirings 37 and 38 are not formed. is formed in a path where 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 place, and the effect that each power transmission It is possible to suppress variations in electromagnetic characteristics due to different lengths of the power supply wires of the coils 32 .

In the wireless power transmission sheet 120 of the second embodiment, four second-stage power transmission coil units 20D obtained by removing the power supply line 44 from the wireless power transmission sheet 20 of the first embodiment are arranged in a matrix, and the third power transmission coil unit 20D is placed in the center. An "H"-shaped third-stage power supply line is provided with a stage power-supply point 140, 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 have equal lengths and line symmetry. 142 to be connected. Furthermore, as shown in the wireless power transmission sheet 220 of the embodiment of FIG. 6, four third-stage power transmission coil units 120B obtained by removing the power supply line 144 from the wireless power transmission sheet 120 of the second embodiment are arranged in a matrix. , a fourth-stage feeding point 240 is provided in the center thereof, and the fourth-stage feeding point 240 and each third-stage feeding point 140 of each third-stage power transmitting coil unit 120B are formed into an "H" shape having equal length and line symmetry. may be connected by the fourth stage power supply wiring 242 . Thus, the P(n)-th stage transmitting coil units are arranged in a matrix, and the P(n+1)-th stage feeding point is provided in the center, and the P(n+1)-th stage feeding point and each P(n)-th stage Repeat step by step so that each P(n)-th stage power supply point of the power transmission coil unit is connected by the "H"-shaped P(n+1)-th stage power supply 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)-th stage feeding point and each P(n)-th stage of each P(n)-th stage power transmitting coil unit The power supply point is connected by an "H"-shaped power supply wiring having equal length and line symmetry. However, like the wireless power transmission sheet 320 illustrated in FIG. 7 , the second-stage power supply wiring 342 of the same length and point-symmetrical “swastika” shape connects the second-stage power supply point 340 and each of the first-stage power supply points 36 . may be connected by In this case, in order to prevent the “I”-shaped power supply wirings 37 and 38 of the first stage power transmission coil unit 30 and the second stage power supply wiring 342 from being on the same path, the first stage power transmission coil unit 30 on the upper left in the figure , and the lower left first stage power transmission coil unit 30 is rotated by 90 degrees. In this case, a part of the feed line 344 connected to the external power supply is formed along the same route as the second stage feed wiring 342 . Furthermore, as shown in a wireless power transmission sheet 420 illustrated in FIG. 8, four second-stage power transmission coil units 320B obtained by removing the power supply line 344 from the wireless power transmission sheet 320 in FIG. A third-stage power supply point 440 is provided in the third-stage power supply point 440, 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 arranged in an equal length and point-symmetrical "swastika" shape. A wiring 442 may be used for connection. Thus, the Q(n)-th stage transmitting coil units are arranged in a matrix, and the Q(n+1)-th stage feeding point is provided in the center thereof, and the Q(n+1)-th stage feeding point and each Q(n)-th stage The wireless power is repeated step by step so that each Q(n)-th stage power supply point of the power transmission coil unit is connected by the Q(n+1)-th stage power supply wiring having an equal length and point symmetry "swastika" shape. It may constitute a transmission sheet.

In the wireless power transmission sheet 20 of the first embodiment, the "H"-shaped second stage power supply wiring 42 is formed in a path where the "I"-shaped power supply 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 replaced by the "H"-shaped second-stage power supply wiring 42 and the "I"-shaped power supply wirings 37 and 38. Formed in pathways that were 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 on the route. , the "H"-shaped second-stage power supply wiring 42 and the "I"-shaped power supply wirings 37 and 38 may be formed in the path.

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 vertically and horizontally symmetrically, and the "I"-shaped power supply wiring 37, 38 to the first stage feed 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 supply point by power supply wiring that is not "I" shaped.

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 20</b>D is composed of four first stage power transmission coil units 30 . However, the second-stage power transmission coil units 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)-th stage power transmission coil unit may be composed of a plurality of L(n)-th stage power transmission coil units.

Although the embodiments for carrying out the present invention have been described above, the present invention is not limited to such embodiments at all, and can be modified in various forms without departing from the scope of the present invention. Of course, it can be implemented.

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

20, 20B, 20C, 120, 220, 320, 420 wireless power transmission sheet, 20D, 320B second-stage power transmission coil unit, 30 first-stage power transmission coil unit, 31 power transmission coil unit, 32 power transmission coil, 33 capacitor, 34 switch , 36 first-stage feeding point 37, 38 feeding wiring 40, 340 second-stage feeding point 42, 342 second-stage feeding wiring 44, 144, 244 feeding line 140, 440 third-stage feeding point 142 , 442 third stage feeding wiring, 240 fourth stage feeding point, 242 fourth stage feeding wiring.

Claims (8)

A wireless power transmission sheet in which a plurality of power transmission coils are arranged on a flexible substrate,
From the first-stage power feeding point to each first-stage power feeding point of M first-stage power transmitting coil units having N power transmitting coils connected by equal-length wiring from the second-stage power feeding point, by equal-length wiring from the second-stage power feeding point connected to form a second power transmission coil unit,
A wireless power transmission sheet characterized by: The wireless power transmission sheet according to claim 1,
A third-stage power transmission coil unit is formed by connecting each second-stage power supply point of the M second-stage power transmission coil units to the third-stage power supply point with wires of equal length,
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 units is repeated step by step,
Wireless power transfer sheet. The wireless power transmission sheet according to any one of claims 1 to 3,
said N and said 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 points of the four first-stage power transmission coil units is wiring having linear symmetry or rotational symmetry,
Wireless power transfer sheet. The wireless power transmission sheet according to claim 5,
Wiring from the second-stage power feeding point to the first power-feeding points of the four first-stage power transmission coil units is H-shaped wiring,
Wireless power transfer sheet. The wireless power transmission sheet according to claim 6,
The wiring from the first power supply point to the four power transmission coils is I-shaped wiring,
Wiring from the second-stage power feeding point to the first power-feeding points of the four first-stage power transmission coil units is formed on a route where 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 state in which some of the N power transmission coils forming the first stage power transmission coil unit are disconnected,
Wireless power transfer sheet.

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