JP2010284059A - Noncontact power transmission apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact power transmission apparatus that has high power transmission efficiency and high signal transmission efficiency. <P>SOLUTION: On a surface of a first coil 31 that faces a second coil 32, a magnetic body 33 having a convex portion is disposed. The convex portion penetrates through a hollow part of the first coil 31 and extends into a hollow part of the second coil. The first coil 31 and the second coil 32 provide a power transmission and reception function and a signal transmission and reception function. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a non-contact power transmission apparatus having a function of transmitting and receiving power in a non-contact manner by electromagnetic induction in a portable electronic device and an electronic device used in an environment where power supply by contact is difficult, and in particular, a power transmission coil and a power The present invention relates to a non-contact power transmission device that requires high efficiency and position control between receiving coils.

  In recent years, with the miniaturization of electronic components, portable electronic devices typified by mobile phones and portable music players have been widely spread due to the reduction in size and weight. Furthermore, in recent years, portable electronic devices have been made multifunctional and high-speed processing, and accordingly, the amount of power required by the electronic devices has been increasing. However, in general, portable electronic devices do not have a built-in dedicated charging device, but are driven by the power charged in the built-in secondary battery, and the secondary battery must be charged each time the power of the secondary battery is insufficient. I must.

  In general, when charging a secondary battery of a portable electronic device, the charging terminal of the portable electronic device is brought into contact with the charging terminal installed on the charging stand (cradle) of the charging device to electrically connect the electric power from the charging stand. To charge the secondary battery built in the portable electronic device.

  However, in the charging method in which the charging terminals of the portable electronic device and the charging device are connected in contact with each other, charging may not be possible due to contamination of the charging terminals or foreign object intrusion between the charging terminals. There is an increasing demand for contactless power transmission devices that use contactless power supply. In general, power transmission is performed by making the coils facing each other and receiving the magnetic flux generated from the first coil, which is a transmission coil, by a second coil, which is a reception coil. However, when the flat coil is used, the distance between the first coil and the second coil, the positional deviation between the first coil and the second coil, and the like affect the efficiency. Therefore, various measures are considered for improving the efficiency.

  For example, Patent Document 1 discloses a method of positioning an electromagnetic induction coil by unevenness. FIG. 7 is a diagram showing the configuration of the non-contact power transmission device of Conventional Example 1. FIG. 7 (a) is the first coil, FIG. 7 (b) is the second coil, and FIG. 7 (c) is the first coil. FIG. 7D is a schematic view in which one coil and a second coil are opposed to each other, and FIG. 7D is a perspective view of the housing when the respective components are combined. As shown in FIG. 7, in the non-contact power transmission device 60, a first coil 61 that is a transmission coil and a second coil 62 that is a reception coil are flat plates made by winding a coated conductor in a spiral shape. A type of coil is used. The first coil terminal portion 61a drawn out from the first coil 61 is peeled off and subjected to solder plating or the like for facilitating connection by soldering or the like and connected to a circuit on the power transmission side. The The same treatment is applied to the second coil terminal portion 62a drawn from the second coil 62 and connected to the circuit on the power receiving side. The first coil 61 and the second coil 62 are disposed in the first casing 64 and the second casing 65, respectively. In order to position the first coil 61 and the second coil 62, the first casing convex part 66 is formed in the first casing 64, and the second casing concave part 67 is formed in the second casing 65. .

  Further, Patent Document 2 discloses a method of positioning an electromagnetic induction coil with a magnet. FIG. 8 is a diagram showing the configuration of the non-contact power transmission device of Conventional Example 2. FIG. 8 (a) is the first coil, FIG. 8 (b) is the second coil, and FIG. 8 (c) is the first coil. The first insulating sheet in which one coil is arranged, FIG. 8 (d) is the second insulating sheet in which the second coil is arranged, and FIG. 8 (e) is a perspective view of the housing when the respective components are combined. It is. As shown in FIG. 8, in the non-contact power transmission device 70, the first coil 71 that is a transmission coil and the second coil 72 that is a reception coil are produced by winding a coated conductor in a spiral shape. A flat type coil is used. The first coil terminal portion 71a drawn out from the first coil 71 is peeled off and subjected to solder plating or the like for facilitating connection by soldering or the like, and is connected to a circuit on the power transmission side. The The second coil terminal portion 72a drawn from the second coil 72 is also subjected to the same treatment and connected to the circuit on the power receiving side. The first coil 71 and the second coil 72 are disposed on a first insulator sheet 78 and a second insulator sheet 79, respectively. , A first magnet 76 and a second magnet 77 are provided. The first magnet 76 on the transmission side and the second magnet 77 on the reception side are arranged in the attracting direction to form a first casing 74 and a second casing 75. By the adsorption of the first magnet 76 and the second magnet 77, the first coil 71 and the second coil 72 are positioned.

JP 2008-141940 A JP 2006-238548 A

  In the non-contact power transmission of Conventional Example 1 in FIG. 7, the leakage of magnetic flux in the transmission / reception coil becomes large, leading to a reduction in efficiency. In the non-contact power transmission of the conventional example 2 in FIG. 8, the magnetic flux leaking from the transmitting / receiving coil is collected by the surrounding magnets, and the magnetic flux passing through the coil is reduced, resulting in a decrease in efficiency. . Furthermore, since a magnet is mounted on the receiving side, there is a problem that a small portable device becomes heavy.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the conventional technical problems as described above, and to provide a non-contact power transmission device that has good power transmission efficiency, has both a power transmission / reception function and a signal transmission / reception function, and is easy to carry and can be reduced in size.

  In order to solve the above problem, in the present invention, a magnetic body having a convex portion is disposed on the opposite surface of the first coil facing the second coil, and the convex portion is hollow in the first coil. A non-contact power transmission device having a convex portion extending through the hollow portion of the second coil and having a power transmission / reception function and a signal transmission / reception function with the first coil and the second coil. is there.

  That is, according to the present invention, the first coil having the hollow portion and the second coil having the hollow portion disposed to face the first coil are separated from the first coil. A non-contact power transmission device for transmitting power to the second coil, wherein a magnetic body is disposed on a surface of the first coil opposite to the side facing the second coil, The first coil and the second coil have a function of transmitting the electric power; and a convex portion extending through the hollow portion of the first coil and extending into the hollow portion of the second coil. A non-contact power transmission device having a function of transmitting and receiving signals is obtained.

  That is, according to the present invention, a non-contact power transmission device is obtained in which the cross sections of the hollow portions of the first coil and the second coil are circular or polygonal.

  That is, according to the present invention, there is obtained a non-contact power transmission device characterized in that the cross section of the convex portion of the magnetic body having the convex portion is circular or polygonal.

  That is, according to this invention, the charging device which comprises the non-contact electric power transmission apparatus provided with said 1st coil is obtained.

  That is, according to this invention, the portable terminal device which comprises the non-contact electric power transmission apparatus provided with said 2nd coil is obtained.

  The first coil and the second coil are preferably reduced in size and efficiency by using flat-plate coils.

  The first coil, the second coil, and the magnetic body are preferably configured to have the same size, but each can cope with a change in size configuration. Is obvious.

  According to the present invention, a magnetic material having a convex portion is disposed on the opposite surface of the first coil facing the second coil, and the magnetic flux leaked by extending the convex portion into the hollow portion of the second coil. And the magnetic flux can be efficiently transmitted from the first coil to the second coil. Moreover, since the small portable apparatus which has arrange | positioned the 2nd coil does not arrange | position a magnetic body, it becomes lightweight and easy to carry.

  Furthermore, the first coil and the second coil have both a power transmission / reception function and a signal transmission / reception function, and signals such as RFID are transmitted and received in a similar manner using a circuit that separates power transmission. Both power transmission / reception and signal transmission / reception such as RFID can be performed at the same frequency, and it is possible to reduce the size.

  Therefore, by carrying out the present invention, it is possible to provide a power transmission device that has good power transmission efficiency and signal transmission efficiency and can be reduced in size.

It is a block diagram of the non-contact electric power transmission apparatus of this invention. FIGS. 2A and 2B are diagrams illustrating a configuration of a non-contact power transmission apparatus according to Embodiment 1 of the present invention, in which FIG. 2A is a first coil, FIG. 2B is a second coil, and FIG. FIG. 2 (d) is a perspective view of the housing when the parts are combined. 3A and 3B are diagrams showing a configuration of a non-contact power transmission apparatus according to Embodiment 2 of the present invention, in which FIG. 3A is a first coil, FIG. 3B is a second coil, and FIG. 3C is magnetic. FIG. 3D is a perspective view of the housing when the parts are combined. It is the figure which showed the structure of the non-contact electric power transmission apparatus by Embodiment 3 of this invention, FIG. 4 (a) is a housing perspective view when combining each component, FIG.4 (b) shows each component. FIG. 3 is a perspective view of a housing when combined. It is a power transmission efficiency measurement result of Example 1 of this invention. It is a power transmission efficiency measurement result of Example 2 of this invention. 7A and 7B are diagrams illustrating a configuration of a non-contact power transmission apparatus according to Conventional Example 1, in which FIG. 7A is a first coil, FIG. 7B is a second coil, and FIG. 7C is a first coil. The schematic which made the 2nd coil oppose, FIG.7 (d) is a housing perspective view when combining each component. FIG. 8 is a diagram illustrating a configuration of a non-contact power transmission device according to Conventional Example 2, in which FIG. 8A is a first coil, FIG. 8B is a second coil, and FIG. 8C is a first coil. FIG. 8D is a perspective view of the housing when the first insulating sheet is arranged, FIG. 8D is the second insulating sheet where the second coil is arranged, and FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a configuration diagram of a non-contact power transmission apparatus according to the present invention. FIG. 2 is a diagram showing the configuration of the non-contact power transmission apparatus according to Embodiment 1 of the present invention. FIG. 2 (a) is a first coil, FIG. 2 (b) is a second coil, and FIG. c) is a magnetic body, and FIG. 2D is a perspective view of a housing in which the respective components are combined.

  A non-contact power transmission apparatus 10 shown in the configuration diagram of FIG. 1 includes a first coil 11 for performing power transmission and signal transmission on a first housing 14 having a first coil, and the first coil 11. A first transmission / reception circuit 19 for switching between transmission and reception of power transmission and signal transmission, a power supply circuit 16 for power transmission, and a first signal communication circuit 17 for signal transmission are installed. A second casing 15 having a second coil, a second coil 12 for performing power transmission and signal transmission, and a second transmission / reception circuit for switching transmission / reception of power transmission and signal transmission by the second coil 12 20, a charge control circuit 21 for power transmission, a secondary battery 22 for charging, and a second signal communication circuit 18 for signal transmission are installed.

  The first housing having the first coil of the contactless power transmission device includes means for converting electrical energy into magnetic energy, and the second housing having the second coil converts magnetic energy into electrical energy. Means. Power transmission is performed as described above. In addition, signals such as RFID are transmitted and received using a circuit that separates power transmission. Both the transmission of electric power and the transmission / reception of signals such as RFID are possible at the same 13.56 MHz frequency.

  In the non-contact power transmission device 30 of the first embodiment shown in FIG. 2, the first coil 31 that is a transmission / reception coil and the second coil 32 that is a transmission / reception coil are wound with a coated conductor in a spiral shape, A flat plate-shaped coil having a substantially circular outer shape and hollow portion is used. The first coil terminal portion 31a drawn out from the first coil 31 is stripped of the coating and is subjected to solder plating or the like for facilitating connection by soldering or the like. Connected. The second coil terminal portion 32a drawn out from the second coil 32 is also subjected to the same treatment and connected to the second transmission / reception side circuit. The number of turns, the wire diameter, the wire shape, the size of the coil, and the like are appropriately changed. The first coil 31 is fitted with a magnetic body 33 having a convex portion that penetrates the hollow portion of the first coil and extends to the hollow portion of the second coil. The cross section of the convex portion of the magnetic body 33 is circular. The first coil 31 fitted with a magnetic material having a convex portion is installed in the first housing 34, and the second coil 32 is installed in the second housing 35. The first housing 34 is provided with a first housing protrusion 36 so that the protrusion of the magnetic body 33 having the protrusion is fitted. A second housing recess 37 is formed in the second housing 35 so that the first housing projection 36 of the first housing 34 is fitted. The first housing convex portion 36 of the first housing 34 and the second housing concave portion 37 of the second housing 35 are fitted and faced to form the non-contact power transmission device 30.

(Embodiment 2)
FIG. 3 is a diagram showing a configuration of a non-contact power transmission apparatus according to Embodiment 2 of the present invention. FIG. 3 (a) is a first coil, FIG. 3 (b) is a second coil, and FIG. c) is a magnetic body, and FIG. 3D is a perspective view of the housing when the respective components are combined.

  In the non-contact power transmission device 40 of the second embodiment shown in FIG. 3, a first coil 41 that is a transmission / reception coil and a second coil 42 that is a transmission / reception coil are wound with a coated conductor in a spiral shape, A flat plate-shaped coil having a substantially rectangular outer shape and hollow portion is used. The first coil terminal portion 41a drawn from the first coil 41 is peeled off and subjected to solder plating or the like for facilitating connection by soldering or the like. Connected. The second coil terminal portion 42a drawn from the second coil 42 is also subjected to the same treatment and connected to the second transmission / reception circuit. The number of turns, the wire diameter, the wire shape, the size of the coil, and the like are appropriately changed. A magnetic body 43 having a convex portion is fitted into the first coil 41. The cross section of the convex portion of the magnetic body 43 is formed in a quadrangular shape. The first coil 41 in which a magnetic body having a convex portion extending through the hollow portion of the first coil and extending to the hollow portion of the second coil is inserted into the first casing 44, and the second coil 42. Is installed in the second housing 45. The first housing 44 is provided with a first housing protrusion 46 so that the protrusion of the magnetic body 43 having the protrusion is fitted. A second housing recess 47 is formed in the second housing 45 so that the first housing projection 46 of the first housing 44 is fitted. The first housing convex portion 46 of the first housing 44 and the second housing concave portion 47 of the second housing 45 are fitted and faced to constitute the non-contact power transmission device 40.

(Embodiment 3)
FIG. 4 is a diagram showing a configuration of a non-contact power transmission apparatus according to Embodiment 3 of the present invention. FIG. 4 (a) is a perspective view of a housing when the respective components are combined, and FIG. It is a housing perspective view 2 when each component is combined.

  In the non-contact power transmission device 50 according to the third embodiment shown in FIG. 4, a first coil 51 that is a transmission / reception coil and a second coil 52 that is a transmission / reception coil are formed by winding a coated conductor in a spiral shape. A flat-plate coil having a flat shape having an outer shape and a hollow portion that are substantially circular or substantially square is used. The first coil terminal portion 51a drawn from the first coil 51 is stripped of the coating and is subjected to solder plating or the like for easy connection by soldering or the like. Connected. The second coil terminal portion 52a drawn from the second coil 52 is also subjected to the same treatment and connected to the second transmission / reception side circuit. The number of turns, the wire diameter, the wire shape, the size of the coil, and the like are appropriately changed. A magnetic body 53 having a convex portion extending through the hollow portion of the first coil through the hollow portion of the first coil is fitted into the first coil 51. The cross section of the convex part of the magnetic body 53 is formed in a circle or a quadrangle. A first coil 51 in which a magnetic body having a convex portion is fitted is installed in a first casing 54, and a second coil 52 is installed in a second casing 55. The first casing 54 is provided with a first casing projection 56 so that the projection of the magnetic body 53 having the projection is fitted. A second housing recess 57 is formed in the second housing 55 so that the first housing projection 56 of the first housing 54 is fitted. The first housing convex portion 56 of the first housing 55 and the second housing concave portion 57 of the second housing 55 are fitted and faced to constitute the non-contact power transmission device 50.

  It is efficient that the first coil, the second coil, and the magnetic body have the same size. As shown in FIG. 4A, in the case where the first coil and the magnetic body have a larger configuration, the efficiency is reduced, but the size of the second coil 52 is made larger than that of the second casing 55. It can be made smaller to fit. Further, FIG. 4B shows a perspective view 2 of the casing when the second casing is changed. As shown in the figure, it is possible to deal with various second casings 55, and the combination of the first casing and the second casing is not limited, and there are a plurality of the first casings with respect to the first casing. Thus, the non-contact power transmission device of the present invention can be versatile. Furthermore, the non-contact power transmission device including the first coil is used as a charging device for a portable terminal device such as a mobile phone, and the non-contact power transmission device including the second coil is a mobile phone or the like. Various applications are possible, such as being used as a portable terminal device.

  Hereinafter, the present invention will be described using examples.

Example 1
In the non-contact power transmission apparatus 30 shown in FIG. 2, the first coil 31 has a shape with an outer diameter of 20 mm, an inner diameter of 12 mm, and a thickness of 0.5 mm. The coated conductor used for the winding was a polyurethane-coated copper wire having a wire diameter of 0.5 mm. The number of turns is a flat circular coil with 4 turns. As the second coil 32, the same thing as the first coil 31 was produced and used. The first coil terminal 31a of the first coil and the second coil terminal 32a of the second coil were stripped so as to facilitate measurement. The magnetic body 33 is a ferrite core having an outer shape of 20 mm, a thickness of 0.5 mm, a convex portion diameter of 10 mm, and a convex portion length of 2.5 mm, and has a magnetic permeability of 200. The first casing 34 and the second casing 35 were processed using a commercially available plastic case. Thus, the non-contact power transmission device 30 shown in FIG. 2 was obtained.

  FIG. 5 shows the results of measuring the power transmission efficiency of Example 1 of the present invention. In FIG. 5, the result of having measured the efficiency of the non-contact electric power transmission apparatus of Example 1 of this invention and a comparative product is shown. The comparative product was made in the same manner as the non-contact power transmission device of Example 1, and was a non-contact power transmission device in which the magnetic material was not installed on the first coil. A 13.56 MHz sine wave signal from the transmitter was amplified via a power amplifier and input to the first coil to be excited. A second coil with a 50Ω load resistance connected between the output terminals of the second coil is brought into contact with the first coil, and the current generated in the second coil at that time is measured by a current probe connected to the oscilloscope. Measured and calculated effective output power. The power transmission efficiency was calculated from the ratio with the effective input power of the first coil. The vertical axis is efficiency (effective output power / effective input power), and the horizontal axis is the amount of positional deviation between the first coil and the second coil. Here, the casing is removed so that the convex portion of the magnetic body does not contact the hollow portion on the second coil side, the interval between the first coil and the second coil is 2 mm, and the convex portion of the magnetic body is the second coil. The measurement was carried out without contact with.

  From the measurement result of FIG. 5, it can be seen that the non-contact power transmission apparatus of the present invention can obtain higher efficiency than the comparative product. The magnetic flux efficiently propagates from the first coil to the second coil.

(Example 2)
In the non-contact power transmission device 40 shown in FIG. 3, the first coil 41 has a shape having an outer shape of 20 mm × 20 mm, an inner shape of 12 mm × 12 mm, and a thickness of 0.5 mm. The coated conductor used for the winding was a polyurethane-coated copper wire having a wire diameter of 0.5 mm. The number of turns is a flat rectangular coil with 4 turns. The first coil terminal 41a of the first coil and the second coil terminal 42a of the second coil, which are the same as the first coil, are prepared so that the second coil 42 can be easily measured. The coating was peeled off. The magnetic body 43 is a ferrite core having an outer shape of 20 mm × 20 mm, a thickness of 0.5 mm, a convex cross section of 10 mm × 10 mm, a convex length of 2.5 mm, and a magnetic permeability of 200. The first casing 44 and the second casing 45 were processed using a commercially available plastic case. As described above, the non-contact transmission apparatus shown in FIG. 3 was obtained.

  FIG. 6 shows measurement results of power transmission efficiency in Example 2 of the present invention. In FIG. 6, the result of having measured the efficiency of the non-contact electric power transmission apparatus of Example 2 of this invention and a comparative product is shown. The comparative product was made in the same manner as the non-contact power transmission device of Example 2, and was a non-contact power transmission device in which the magnetic material was not installed on the first coil. The measuring method is the same as in Example 1.

  From the measurement result of FIG. 6, it can be seen that the non-contact power transmission device of the present invention can obtain higher efficiency than the comparative product. Also in this case, the magnetic flux efficiently propagates from the first coil to the second coil.

  The embodiments of the present invention have been described above using the examples. In the embodiments, the shapes of the hollow portions of the first coil and the second coil have been described as a substantially circular shape and a substantially quadrangular shape, but there is no problem with a polygonal shape. Moreover, although the convex part cross section of the magnetic body which has a convex part was demonstrated with the substantially circular shape and the substantially square shape, it is satisfactory even if it is a polygon. In short, the present invention is not limited to this embodiment, and design changes within a range not departing from the gist of the present invention are included in the present invention. That is, various changes and modifications that can be naturally made by those skilled in the art are also included in the present invention.

  The embodiments of the present invention have been described above using the embodiments. However, the present invention is not limited to these embodiments, and the present invention is not limited to the scope of the present invention. Included in the invention. That is, various changes and modifications that can be naturally made by those skilled in the art are also included in the present invention.

  The present invention relates to a non-contact power transmission device capable of increasing power transmission efficiency and signal transmission efficiency, and can be used for small portable devices that are expected to be lighter.

DESCRIPTION OF SYMBOLS 10 Contactless power transmission apparatus 11 1st coil 12 2nd coil 14 1st housing 15 2nd housing 16 Power supply circuit 17 1st signal communication circuit 18 2nd signal communication circuit 19 1st transmission / reception circuit 20 Second transmission / reception circuit 21 Charging control circuit 22 Secondary battery 30 Non-contact power transmission device 31 First coil 31a First coil terminal unit 32 Second coil 32a Second coil terminal unit 33 Magnetic body 34 First Housing 35 Second housing 36 First housing protrusion 37 Second housing recess 40 Non-contact power transmission device 41 First coil 41a First coil terminal 42 Second coil 42a Second coil terminal 43 Magnetic body 44 First housing 45 Second housing 46 First housing convex portion 47 Second housing concave portion 50 Non-contact power transmission device 51 First coil 51a First coil terminal portion 52 Second coil 52a Second coil terminal portion 53 Magnetic body 54 First housing 55 Second housing 56 First housing convex portion 57 Second housing concave portion 60 Non-contact power transmission device 61 First coil 61a First coil terminal portion 62 2nd coil 62a 2nd coil terminal part 64 1st housing 65 2nd housing 66 1st housing convex part 67 2nd housing recessed part 70 Non-contact electric power transmission apparatus 71 1st coil 71a 1st Coil terminal portion 72 Second coil 72a Second coil terminal portion 74 First housing 75 Second housing 76 First magnet 77 Second magnet 78 First insulator sheet 79 Second insulator sheet

Claims (5)

  Power is supplied from the first coil to the second coil by a first coil having a hollow portion and a second coil having a hollow portion disposed opposite to the first coil. A non-contact power transmission device for transmitting, wherein a magnetic body is disposed on a surface of the first coil opposite to a side facing the second coil, and the magnetic body is a hollow of the first coil. The first coil and the second coil have a function of transmitting the power and a function of transmitting and receiving signals. The convex portion extends through the hollow portion of the second coil. A non-contact power transmission device.   The non-contact power transmission apparatus according to claim 1, wherein a cross section of a hollow portion of the first coil and the second coil is circular or polygonal.   The non-contact power transmission device according to claim 1 or 2, wherein a cross section of the convex portion of the magnetic body having the convex portion is circular or polygonal.   The charging device which comprises the non-contact electric power transmission apparatus of Claims 1-3 provided with said 1st coil.   The portable terminal device which comprises the non-contact electric power transmission apparatus of Claims 1-3 provided with said 2nd coil.

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