JP2010226929A - Power transmitting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmitting apparatus capable of ensuring power transmission efficiency from a power transmitting device to a power-receiving device, using a simple operation. <P>SOLUTION: The power transmitting apparatus 10 is equipped with: a power transmission device 20, having a power transmission coil 24 for generating a magnetic flux B1; a power-receiving device 50, that is a separate body from the power transmitting device 20 and has a power-receiving coil 54 that receives the magnetic flux B1 and converts it into electric energy; and a guidance means that guides the power transmitting device 20 to a position, where the magnetic flux B1 generated by the power transmission coil 24 forms a closed magnetic path M1, by passing inside the power-receiving coil 54, when positioning the power transmitting device 20, with respect to the power-receiving device 50. By making the apparatus into such a structure, the power transmission apparatus can ensure power transmission efficiency from the power transmitting device 20 to the power-receiving device 50 by using a simple operation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power transmission device.

  2. Description of the Related Art Conventionally, a power transmission device that transmits power in a non-contact manner from a power transmission side to a power reception side is known (for example, Patent Document 1). In Patent Document 1, a power transmission device having a plane spiral-type power transmission coil and a power reception device having a plane spiral-type power reception coil are brought close to each other so that the planes of the two coils face each other, and the power transmission coil and the power reception coil are electromagnetically coupled. The power is transmitted in a contactless manner. Further, in Patent Document 1, a magnetic sheet is provided on the surface opposite to the opposing surface of the two coils so as to cover the entire surface, thereby suppressing the unnecessary radiation from the coil and improving the efficiency of power transmission. I am trying.

JP 2006-042519 A

  An object of the present invention is to provide a power transmission device that secures transmission efficiency of power from a power transmission device to a power reception device with a simple operation.

  The power transmission device according to claim 1 of the present invention is separated from the power transmission device having a power transmission coil for generating magnetic flux and the power transmission device, and receives the magnetic flux generated by the power transmission coil and converts it into electrical energy. A power receiving device having a power receiving coil, and when the power transmitting device is positioned with respect to the power receiving device, the magnetic flux generated by the power transmitting coil passes through the inside of the power receiving coil to form a closed magnetic circuit. Guiding means for guiding.

  According to a second aspect of the present invention, in the power transmission device according to the second aspect of the invention, the guide unit includes an engagement convex portion provided on one of the power transmission device and the power reception device, and one of the power transmission device and the power reception device. An engagement recess provided on the other side and engageable with the engagement protrusion.

  The power transmission device according to claim 3 of the present invention is such that the power transmission device has a power transmission core that is a magnetic body around which the power transmission coil is wound, and the power reception device is a magnetic body around which the power reception coil is wound. A power receiving core.

  In the power transmission device according to claim 4 of the present invention, any one of the power transmission core and the power receiving core is disposed inside the engaging convex portion, and the power transmitting core and the power receiving core are disposed inside the engaging concave portion. Either one of the cores was placed.

  In the power transmission device according to claim 5 of the present invention, the power transmission coil has a planar spiral shape, and the power reception coil has a planar spiral shape whose length in one direction is longer than that of the power transmission coil.

  According to a sixth aspect of the present invention, the power transmission device includes an information transmission coil that generates a magnetic flux according to information to be transmitted, and the power reception device includes a magnetic flux generated by the information transmission coil. Receiving the information receiving coil for converting into electrical energy, and the information transmitting coil and the information receiving coil are generated when the power transmitting device and the power receiving device are guided by the guiding means. The arranged magnetic flux is arranged so as to form a closed magnetic path passing through the inside of the information receiving coil.

  The power transmission device according to claim 7 of the present invention, the power transmission device includes a power holding unit that holds power and a storage unit that stores image information transmitted by the information transmission coil, The power receiving device is provided in an image display device that displays an image, and transmits electric energy converted by the power receiving coil to the image display device, and transmits electric energy converted by the information receiving coil to the image display device. .

  The power transmission device according to claim 8 of the present invention is a power transmission device that includes a power holding unit that holds power, and a planar spiral power transmission coil that generates magnetic flux, and is separate from the power transmission device. An image display device that displays an image has a planar spiral-shaped receiving coil that receives magnetic flux generated by the power transmission coil and converts it into electric energy, and the electric energy converted by the power receiving coil is supplied to the image display device. A power receiving device for transmission, wherein the power receiving coil is longer in one direction than the power transmitting coil.

  According to the first aspect of the present invention, the transmission efficiency of power from the power transmission apparatus to the power reception apparatus can be ensured with a simple operation, compared with the case where the power transmission coil and the power reception coil are electromagnetically coupled.

  According to the second aspect of the present invention, the positioning of the power transmission device with respect to the power receiving device can be simplified as compared with the case where the engaging convex portion and the engaging concave portion are not used for positioning the power transmitting device with respect to the power receiving device.

  The invention of claim 3 can efficiently induce the magnetic flux generated by the power transmission coil to the inside of the power reception coil as compared with the case where the power transmission core and the power reception core are not provided.

  The power transmission core and the power receiving when the engaging convex portion and the engaging concave portion are engaged with each other as compared with the case where the core that is a magnetic body is not disposed inside the engaging convex portion and the engaging concave portion. The core distance can be reduced.

  According to the fifth aspect of the present invention, the power transmitting device and the power receiving device can be reduced in size as compared with the case where the power transmitting coil and the power receiving coil are not in a plane spiral shape.

  The invention according to claim 6 can transmit information from the power transmission device to the reception device.

  The image information transmitted from the power transmission apparatus to the power reception apparatus can be displayed on the image display apparatus.

  The invention according to claim 8 can secure the transmission efficiency of power from the power transmission device to the power reception device with a simple operation.

It is a block diagram which shows schematic structure of the power transmission apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows schematic structure of the electric power transmission apparatus of the state before the closed magnetic circuit of 1st Embodiment is formed. It is sectional drawing which shows schematic structure of the electric power transmission apparatus of the state in which the closed magnetic circuit of 1st Embodiment was formed. It is a block diagram which shows schematic structure of the power transmission apparatus of 1st Embodiment. It is sectional drawing which shows schematic structure of the 1st modification of the power transmission device of the state before the closed magnetic circuit of 1st Embodiment is formed. It is sectional drawing which shows schematic structure of the 1st modification of the power transmission device of the state in which the closed magnetic circuit of 1st Embodiment was formed. It is sectional drawing which shows schematic structure of the 2nd modification of the power transmission device of the state before the closed magnetic circuit of 1st Embodiment is formed. It is sectional drawing which shows schematic structure of the 2nd modification of the power transmission device of the state in which the closed magnetic circuit of 1st Embodiment was formed. It is sectional drawing which shows schematic structure of the 3rd modification of the power transmission device of the state before the closed magnetic circuit of 1st Embodiment is formed. It is sectional drawing which shows schematic structure of the 3rd modification of the power transmission device of the state in which the closed magnetic circuit of 1st Embodiment was formed. It is sectional drawing which shows schematic structure of the 4th modification of the power transmission device of the state before the closed magnetic circuit of 1st Embodiment is formed. It is sectional drawing which shows schematic structure of the 4th modification of the power transmission device of the state in which the closed magnetic circuit of 1st Embodiment was formed. It is a block diagram which shows schematic structure of the power transmission apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows schematic structure of the electric power transmission apparatus of the state in which the closed magnetic circuit of 2nd Embodiment was formed.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a power transmission device 10 according to the first embodiment. As illustrated in FIG. 1, the power transmission device 10 includes a power transmission device 20 and a power reception device 50, and transmits power from the power transmission device 20 to the power reception device 50 by bringing the power transmission device 20 and the power reception device 50 closer to each other. is there. In the present embodiment, the power receiving device 50 is mounted on the image display device 80 capable of displaying an image according to image information.

  The power transmission device 20 includes a resin housing 22, a power transmission coil 24 that is provided inside the housing 22 and converts electric energy into magnetic flux by electromagnetic induction to generate magnetic flux B <b> 1 (electric power), and the power transmission coil 24 includes A wound power transmission core 26 and a battery 28 that supplies power to the power transmission coil 24 are provided. The battery 28 may be either a primary battery or a secondary battery.

  The power transmission core 26 is formed of a magnetic material, for example, a magnetic material having high permeability such as ferrite, a silicon steel plate, or a directional steel plate, in a long plate shape, and both end portions in the width direction (direction perpendicular to the longitudinal direction). 26A is bent in the same direction at a substantially right angle (so-called U-shape). As shown in FIG. 2, the power transmission coil 24 is spirally wound around the both end portions 26A. In addition, in this embodiment, although the copper wire is used as the power transmission coil 24, if it is a conductor, you may use other than a copper wire.

  Further, as shown in FIG. 2, the housing 22 has substantially the same shape as the power transmission core 26, and a portion corresponding to the groove-shaped concave portion formed between both end portions 26 </ b> A of the power transmission core 26 is a groove. It is recessed in the shape. In the following, the portion of the housing 22 that is recessed in the groove shape is referred to as an engagement recess 30. An engagement convex portion 60 of the casing 52 described later can be fitted (engaged) with the engagement concave portion 30.

  The power receiving device 50 includes a resin casing 52 and a power receiving coil that is provided inside the casing 52 and receives the magnetic flux B1 generated by the power transmitting coil 24 and converts the magnetic flux B1 into electric energy (electric power) by electromagnetic induction. 54 and a power receiving core 56 around which the power receiving coil 54 is wound.

  The power receiving core 56 is formed by forming a magnetic material, for example, a magnetic material having a high magnetic permeability such as ferrite, a silicon steel plate, or a directional steel plate into a long plate shape. As shown in FIG. A projection 58 extending in the longitudinal direction is provided at the central portion of the direction perpendicular to the direction. As shown in FIG. 2, a power receiving coil 54 is spirally wound around the protrusion 58. In this embodiment, a copper wire is used as the power receiving coil 54. However, other than a copper wire may be used as long as it is a conductor.

  As shown in FIG. 2, the casing 52 has substantially the same shape as the power receiving core 56, and a portion corresponding to the protrusion 58 of the power receiving core 56 protrudes. The protruding portion has a size that can be fitted (engaged) with the engaging concave portion 30. Hereinafter, the protruding portion is referred to as an engaging convex portion 60.

  Here, the power transmission from the power transmission device 20 to the power reception device 50 will be briefly described with reference to FIG. 3. As shown in FIG. 3, when the power transmission device 20 is positioned with respect to the power reception device 50, the engagement convex portion 60 of the power reception device 50 is fitted into the engagement recess 30 of the power transmission device 20. Accordingly, the end (top) of the protrusion 58 of the power receiving core 56 faces the central portion 26B of the power transmission core 26, and both end portions 26A of the power transmission core 26 face both end portions 56B of the power receiving core 56, respectively. In this state, when the power transmission coil 24 generates the magnetic flux B1, the generated magnetic flux B1 is radiated from the both ends 26A through the magnetic body having a higher permeability than in the atmosphere, that is, through the power transmission core 26, and the power reception core. The light is transmitted (incident) to both ends 26A of 56. The transmitted magnetic flux B <b> 1 is radiated (transmitted) from the end of the protrusion 58 to the central portion 26 </ b> B of the power transmission core 26 through the power receiving core 56, and returns to the power transmission coil 24 of the power transmission core 26. Thereby, the closed magnetic circuit M1 shown in FIG. 3 is formed. At this time, since the magnetic flux B1 passes inside the power receiving coil 54, the magnetic flux B1 is converted into electric energy by electromagnetic induction. The converted electric energy is transmitted to a power supply circuit 90 of the image display device 80 described later.

  As illustrated in FIG. 4, the power transmission device 20 includes a storage unit 36 (for example, a non-volatile memory) that stores information, an operation unit 38 for selecting information stored in the storage unit 36, and an image. The display part 40, the transmission part which transmits the selected information, and the control part 44 which controls these operation | movement are provided.

  The transmission unit includes an information transmission coil 46 that converts selected information (electrical signal) into magnetic flux by electromagnetic induction to generate magnetic flux B2. In the present embodiment, the information transmission coil 46 is a conductor such as a copper wire formed into a plane spiral shape, and a plate-like magnetic body 48 is disposed on the back side thereof to suppress external leakage of magnetic flux. ing. However, the present invention is not limited to this configuration, and the conductor may be formed in a plane spiral shape on a substrate such as a flexible printed circuit board. Further, the magnetic body 48 is made of a material having a lower magnetic permeability than that of the power transmission core 26. Thereby, crosstalk is suppressed.

  The control unit 44 also controls power supply from the battery 28 to the power transmission coil 24, the storage unit 36, the operation unit 38, the image display unit 40, and the information transmission coil 46.

  As shown in FIG. 4, the image display device 80 includes a power reception device 50, a power supply circuit 90 that transmits power from the power reception device 50, and a display unit that can display or rewrite an image with the power from the power supply circuit 90. And a sheet display base 82 and an image display control unit (not shown) for controlling the operation of the base 82. Here, for example, electronic paper or a transparent EL sheet may be used as the sheet-like substrate 82, but the present invention is not limited to this configuration. Note that the electronic paper is an image display medium having a memory property that can be rewritten repeatedly. For example, there is an image display medium using colored particles or one using electrophoresis, but the present invention is limited to this configuration. However, any conventionally known one may be used.

  The power receiving device 50 includes a receiving unit that receives information transmitted from the transmitting unit, next to the power receiving core 56. Specifically, the receiving unit includes an information receiving coil 66 that receives the magnetic flux B2 generated by the information transmitting coil 46 and converts it into electrical energy, and the information receiving coil 66 has a direction in which the protrusion 58 extends. It extends in the same direction. In the present embodiment, the information receiving coil 66 is a conductor in which a copper wire or the like is formed in a plane spiral shape, and a plate-like magnetic body 68 is disposed on the back side thereof to suppress external leakage of magnetic flux. ing. However, the present invention is not limited to this configuration, and the conductor may be formed in a plane spiral shape on a substrate such as a flexible printed circuit board. The magnetic body 68 is made of a material having a lower magnetic permeability than that of the power receiving core 56. Thereby, crosstalk is suppressed. The image display control unit also controls power supply to the base 82.

  Here, the information transmission from the power transmission device 20 to the power reception device 50 will be briefly described with reference to FIG. 3. As shown in FIG. 3, when the engaging convex portion 60 of the power receiving device 50 is fitted into the engaging concave portion 30 of the power transmitting device 20 when the power transmitting device 20 is positioned with respect to the power receiving device 50, the information transmitting coil 46 and the information The receiving coil 66 faces each other. In this fitted state, the magnetic flux B <b> 2 generated by the information transmission coil 46 passes through the inside of the information reception coil 66 and enters the magnetic body 68, is radiated from both ends of the magnetic body 68, and enters from both ends of the magnetic body 48. The information transmission coil 46 is then returned. At this time, since the magnetic flux B2 passes through the inside of the information receiving coil 66, the magnetic flux B2 is converted into electric energy by electromagnetic induction. This electric energy is transmitted to a signal processing circuit 86 of the image display device 80 described later. When the information processed by the signal processing circuit 86 is image information, the image display control unit causes the base 82 to display an image.

Next, a procedure for transmitting power to the image display device 80 and transmitting (transmitting) image information to cause the image display device 80 to display an image will be described.
First, the user operates the operation unit 38 while viewing the image display unit 40 of the power transmission device 20, and selects image information to be transmitted from the image information stored in the storage unit 36. When the image information is selected, the control unit 44 causes the information transmission coil 46 to generate a magnetic flux B2 corresponding to the selected image information. At the same time, the control unit 44 generates a magnetic flux B <b> 1 in the power transmission coil 24.

  Next, the user performs positioning so that the engaging convex portion 60 of the image display device 80 is fitted into the engaging concave portion 30 of the power transmission device 20. At this time, since the engaging convex portion 60 has a protruding shape and the engaging concave portion 30 has a groove shape, the engaging concave portion 30 can be freely positioned as long as it extends along the extending direction of the engaging convex portion 60. The engaging convex part 60 can be fitted together. When the engagement convex part 60 and the engagement concave part 30 are fitted, as described above, electrical energy is transmitted from the power transmission device 20 to the power reception device 50, and the selected image information is transmitted. Note that, regardless of the position of the engagement protrusion 60 where the engagement recess 30 is fitted, the closed magnetic path M1 is formed, so that the transmission efficiency of electric energy (electric power) is ensured. Also, in the transmission of image information, the extending direction of the information receiving coil 66 is the same direction as the extending direction of the protrusion 58, so the engagement recess 30 is fitted at any position of the engagement protrusion 60. However, since the closed magnetic circuit M2 is formed, the transmission efficiency of electric energy (signal) is ensured. Thereby, electric power and a signal are transmitted from the power transmission apparatus 20 to the power receiving apparatus 50 by a simple fitting operation, and a certain level of transmission efficiency is ensured.

  In the image display device 80, the power from the power receiving device 50 is received by the power supply circuit 90, and the signal processing circuit 86 and the image display control unit are activated. The electric energy from the power receiving device 50 is converted into an image processing signal (image information) by the signal processing circuit 86. The image display control unit causes the base 82 to display an image.

In the first embodiment, the power transmission coil 24 is wound around the both ends 26A of the power transmission core 26, and the power reception coil 54 is wound around the protrusion 58 of the power reception core 56. However, the present invention is limited to this configuration. There is no.
For example, as in the first modification shown in FIGS. 5 and 6, the power transmission device 110 in which the power transmission coil 112 is wound around the central portion 26 </ b> B of the power transmission core 26 and the plate-like shape only in the portion corresponding to the engagement convex portion 34. The closed magnetic circuit M <b> 1 may be formed by the power receiving device 118 in which the power receiving core 114 is disposed and the power receiving coil 116 is wound around the power receiving core 114.
Further, as in the second modified example shown in FIGS. 7 and 8, a closed magnetic circuit M <b> 1 is formed by the power transmission device 110 and the power reception device 126 in which the plate-shaped power transmission core 122 is disposed only at the lower portion of the housing 124. Also good.
Further, as in the third modification shown in FIGS. 9 and 10, the closed magnetic circuit M <b> 1 may be formed by the power transmission device 110 and the power reception device 130 in which the planar spiral conductor 132 is formed on the flexible substrate 134.
In the first to third modifications described above, the housing of each power receiving device can be reduced in size, so that the image display device 80 can be thinned.

  In the first embodiment, the power transmission device 20 is moved from the top to the bottom with respect to the power receiving device 50 so that the engagement convex portion 60 is fitted into the engagement concave portion 30. There is no need to be limited to the configuration, and the power receiving device 50 may be sandwiched so that the shape of the power transmitting device 140 is sandwiched between the power receiving devices 50 from the side as in the fourth modification shown in FIGS. 11 and 12. The positions of the information transmission coil 46 and the magnetic body 48 of the power reception device 50 are provided on the back side of the power reception device 50, and the information transmission coil 46 and A magnetic body 48 may be disposed.

[Second Embodiment]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, a power transmission device 200 in which no engaging convex portion or engaging concave portion is formed in the power transmitting device 210 and the power receiving device 220 will be described. In addition, since this Embodiment has a structure and an effect | action substantially the same as 1st Embodiment, the same code | symbol is attached | subjected to the same part and detailed description is abbreviate | omitted.

  As shown in FIGS. 13 and 14, the power transmission device 210 is provided with a planar spiral power transmission coil 214 inside a synthetic resin casing 212, and a rear surface 214 </ b> A (upper surface in the drawing) of the power transmission coil 214. The magnetic body 216 is disposed in the case. The power transmission coil 214 is a winding such as a copper wire.

  The power receiving device 220 is provided with a planar spiral power receiving coil 224 inside a synthetic resin casing, and a magnetic body 226 is disposed on the back surface 224A (the lower surface in the figure) of the power receiving coil 224. ing. The power receiving coil 224 is a winding such as a copper wire, for example.

  In the present embodiment, the width of the power transmission coil 214 (length in the width direction) and the width of the power reception coil 224 are substantially the same, and the power reception coil 224 is longer than the length of the power transmission coil 214 (length in the longitudinal direction). The length of the coil 224 is increased. Accordingly, if the power transmission device 210 is disposed on the power reception device 220, a certain level of transmission efficiency is ensured regardless of the position.

  Further, in the above-described embodiment, the image display of one image display device 80 is performed using the power transmission device 10, but the same image can be displayed on a plurality of image display devices 80.

  The embodiments of the present invention have been described with reference to the embodiments. However, these embodiments are merely examples, and various modifications may be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

DESCRIPTION OF SYMBOLS 10 Electric power transmission apparatus 20 Electric power transmission apparatus 24 Electric power transmission coil 26 Electric power transmission core 30 Engagement recessed part 34 Engagement convex part 36 Memory | storage part 46 Information transmission coil 50 Power reception apparatus 54 Power reception coil 56 Power reception core 60 Engagement convex part 66 Information reception coil 80 Image display Device 110 Power transmission device 112 Power transmission coil 114 Power reception core 116 Power reception coil 118 Power reception device 122 Power transmission core 126 Power reception device 130 Power reception device 140 Power transmission device 200 Power transmission device 210 Power transmission device 214 Power transmission coil 220 Power reception device 224 Power reception coil B1 Magnetic flux B2 Magnetic flux M1 Magnetic closure M1 Road M2 closed magnetic circuit

Claims (8)

A power transmission device having a power transmission coil for generating magnetic flux;
A power receiving device that is separate from the power transmitting device and has a power receiving coil that receives magnetic flux generated by the power transmitting coil and converts it into electrical energy;
Guidance means for guiding the power transmission device to a position where a magnetic flux generated by the power transmission coil passes through the inside of the power reception coil to form a closed magnetic circuit when positioning the power transmission device with respect to the power reception device;
A power transmission device.   The guide means is engageable with the engaging convex portion provided on one of the power transmitting device and the power receiving device, and on the other of the power transmitting device and the power receiving device. The power transmission device according to claim 1, further comprising an engagement recess. The power transmission device has a power transmission core that is a magnetic body around which the power transmission coil is wound,
The power transmission device according to claim 2, wherein the power reception device has a power reception core that is a magnetic body around which the power reception coil is wound. Either one of the power transmission core and the power reception core is arranged inside the engagement convex portion,
The power transmission device according to claim 3, wherein one of the power transmission core and the power reception core is disposed inside the engagement recess. The power transmission coil is a plane spiral,
The power transmission device according to claim 2, wherein the power receiving coil has a planar spiral shape whose length in one direction is longer than that of the power transmitting coil. The power transmission device has an information transmission coil that generates a magnetic flux according to information to be transmitted,
The power receiving device has an information receiving coil that receives magnetic flux generated by the information transmitting coil and converts the magnetic flux into electrical energy,
The information transmission coil and the information reception coil have a closed magnetic path through which the magnetic flux generated by the information transmission coil passes through the inside of the information reception coil when the power transmission device and the power reception device are guided by the guide unit. The power transmission device according to claim 1, wherein the power transmission device is arranged so as to be formed. The power transmission device includes a power holding unit that holds power, and a storage unit that stores image information transmitted by the information transmission coil,
The power receiving device is provided in an image display device that displays an image, and transmits electric energy converted by the power receiving coil to the image display device, and transmits electric energy converted by the information receiving coil to the image display device. The power transmission device according to claim 6. A power transmission device having a power holding unit that holds power, and a planar spiral-shaped power transmission coil that generates magnetic flux;
Separate from the power transmission device, provided in an image display device for displaying an image, having a planar spiral-shaped power reception coil that receives magnetic flux generated by the power transmission coil and converts it into electrical energy, and is converted by the power reception coil A power receiving device for transmitting the electrical energy to the image display device;
With
The power receiving device is a power transmission device having a length in one direction longer than that of the power transmission coil.

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