Source: https://patents.google.com/patent/JP2013169122A/en
Timestamp: 2019-11-12 09:37:29
Document Index: 215342660

Matched Legal Cases: ['art 211', 'art 33', 'art 31', 'art 32', 'art 13', 'art 13', 'art 14', 'art 20', 'art 30', 'art 32', 'art 33', 'art 40']

JP2013169122A - Non-contact charge module and portable terminal having the same - Google Patents
Non-contact charge module and portable terminal having the same Download PDF
JP2013169122A
JP2013169122A JP2012032317A JP2012032317A JP2013169122A JP 2013169122 A JP2013169122 A JP 2013169122A JP 2012032317 A JP2012032317 A JP 2012032317A JP 2012032317 A JP2012032317 A JP 2012032317A JP 2013169122 A JP2013169122 A JP 2013169122A
JP2012032317A
Munenori Fujiwara
2012-02-17 Application filed by Panasonic Corp, パナソニック株式会社 filed Critical Panasonic Corp
2012-02-17 Priority to JP2012032317A priority Critical patent/JP2013169122A/en
2013-08-29 Publication of JP2013169122A publication Critical patent/JP2013169122A/en
238000007600 charging Methods 0 abstract claims description 392
238000004891 communication Methods 0 abstract description 74
229910000529 magnetic ferrites Inorganic materials 0 claims description 16
To achieve downsizing by making a non-contact charging coil and an NFC antenna into one module, and to prevent mutual interference, communication and power transmission in the same direction can be performed while changing the coil axis direction of the antenna. An object of the present invention is to provide a non-contact charging module and a portable terminal including the same.
A charging coil 30 around which a conducting wire is wound and an NFC coil 40 arranged around the charging coil 30 are provided, and the axis of the charging coil 30 and the axis of the NFC coil 40 intersect each other. It is set as the non-contact charge module characterized by these.
The present invention relates to a contactless charging module including a contactless charging module and an NFC antenna, and a portable terminal including the contactless charging module.
In recent years, as an antenna mounted on a communication device such as a portable terminal device, there is an NFC (Near Field Communication) antenna using a radio frequency identification (RFID) technology and using a 13.56 MHz band radio wave. In order to improve the communication efficiency of the NFC antenna, a NFC antenna module is provided with a magnetic sheet that improves the efficiency of 13.56 MHz band communication. It has also been proposed to mount a contactless charging module in a communication device and perform the charging method of the communication device by contactless charging. This is a power transmission coil on the charger side, a power reception coil on the communication device side, and electromagnetic induction is generated between both coils in the band of about 100 kHz to 200 kHz, and power is transmitted from the charger to the communication device side. It is. In order to improve the communication efficiency, the non-contact charging module also includes a magnetic sheet that improves the efficiency of communication in the band of about 100 kHz to 200 kHz, and is a non-contact charging module.
NFC is short-range wireless communication in which communication is performed by electromagnetic induction using a 13.56 MHz band frequency. In the non-contact charging, power is transmitted by electromagnetic induction using a frequency in a band of about 100 kHz to 200 kHz. Therefore, the optimum magnetic sheet for improving the efficiency of communication (power transmission) in each frequency band differs between the NFC module and the non-contact charging module. On the other hand, since both the NFC module and the non-contact charging module perform communication (power transmission) by electromagnetic induction, they tend to interfere with each other. Moreover, in order to improve the efficiency of electromagnetic induction, generally both coils are wound in a flat shape to increase the opening area. As a result, there is a possibility that the other module takes away the magnetic flux during communication of one module, and an eddy current may be generated in the other coil to weaken the electromagnetic induction of one module.
Therefore, in (patent document 1), each of the NFC module and the non-contact charging module includes a magnetic sheet, and each is arranged as a module. However, miniaturization of the communication device is hindered. Also, the communication directions are changed so as not to interfere with each other's communication, and the communication surface changes depending on the type of communication, which is very inconvenient. Furthermore, in recent years, there are smartphones that use most of one surface of the housing as a display unit. When applied to a smartphone, one communication must be performed on the display unit side.
In view of the above problems, the present invention achieves downsizing by making the non-contact charging coil and the NFC antenna into one module, and in order to prevent mutual interference, the antenna axial directions are different while being different. An object of the present invention is to provide a non-contact charging module capable of communication and power transmission and a portable terminal including the same.
In order to solve the above problems, a non-contact charging module according to the present invention includes a charging coil around which a conductive wire is wound, and an NFC coil disposed around the charging coil, and the charging coil shaft and the NFC The coil axes intersect with each other.
According to the present invention, the non-contact charging coil and the NFC antenna are made into a single module to achieve miniaturization, and in order to prevent mutual interference, communication in the same direction can be performed while changing the coil axis direction of the antenna. A non-contact charging module that enables power transmission and a portable terminal including the same can be obtained.
Schematic of the non-contact charging module in the embodiment of the present invention Schematic of charging coil and magnetic sheet in an embodiment of the present invention The figure which shows the relationship between a primary side non-contact charge module provided with the magnet in embodiment of this invention, and a charging coil. The figure which shows the relationship between the magnitude | size of the internal diameter of a charging coil, and the L value of a charging coil when the outer diameter of a charging coil is made constant with the case where a primary side non-contact charging module is equipped with the case where it does not comprise The figure which showed the relationship between the L value of a charging coil, and the ratio of the hollowing of a center part in the case where a primary side non-contact charging module is provided with a magnet The perspective view at the time of assembling the NFC coil and magnetic body in this Embodiment Exploded view showing arrangement of NFC coil and magnetic material in the present embodiment The figure which shows the wiring of the NFC coil in this Embodiment The conceptual diagram which shows the antenna apparatus formed with the electronic circuit board and NFC coil which were mounted in the portable terminal in this Embodiment, and the magnetic force line which generate | occur | produces from the antenna apparatus Schematic diagram of magnetic field lines generated by charging coil and NFC coil in the present embodiment The perspective view which shows the portable terminal provided with the non-contact charge module provided with the non-contact charge module in this Embodiment and the loop shape NFC antenna for a comparison. The figure which shows the frequency characteristic of the induced voltage of each of two non-contact charge modules shown by FIG. The figure which shows the magnetic field in each YZ plane of two non-contact charge modules shown by FIG. The figure which shows the magnetic field in each ZX plane of two non-contact charge modules shown by FIG. Sectional drawing which showed typically the portable terminal provided with the non-contact charge module of this Embodiment
The invention according to claim 1 includes a charging coil around which a conducting wire is wound, and an NFC coil disposed around the charging coil, wherein the axis of the charging coil and the axis of the NFC coil are mutually connected. It is a non-contact charging module characterized by crossing, and by making the contact charging coil and NFC antenna into one module, miniaturization is achieved and the coil axis direction of the antenna is different to prevent mutual interference However, a non-contact charging module that enables communication and power transmission in the same direction can be obtained.
The invention according to claim 2 is the non-contact charging module according to claim 1, wherein the axis of the charging coil and the axis of the NFC coil are substantially orthogonal to each other. Can prevent most.
The invention described in claim 3 is characterized in that the charging coil is wound in a rectangular shape, and at least two of the NFC coils are arranged along two opposing sides of the rectangular charging coil. The contactless charging module according to claim 1, wherein the NFC communication possible area can be expanded in a balanced manner around the contactless charging module.
The invention according to claim 4 is provided with a magnetic sheet having a surface on which the entire charging coil is placed, and the NFC coil is disposed outside the magnetic sheet. It is a non-contact charging module, and communication of the NFC coil can be made efficient.
According to a fifth aspect of the present invention, the charging coil is placed on a surface, is placed on a surface of a magnetic sheet, the NFC coil is wound around a magnetic body, and the magnetic sheet and the magnetic body Is a non-contact charging module according to claim 1, wherein the non-contact charging module and the NFC communication can be efficiently performed.
The invention according to claim 6 is a portable terminal comprising the non-contact charging module according to any one of claims 1 to 5, wherein the contact charging coil and the NFC antenna are combined into one. Miniaturization is achieved by modularization, and a portable terminal equipped with a contactless charging module that enables communication and power transmission in the same direction while changing the coil axis direction of the antenna to prevent mutual interference is obtained. be able to.
[About non-contact charging module]
Hereinafter, the outline of the non-contact charging module in the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram of a contactless charging module according to an embodiment of the present invention. FIG. 1A is a top view of the contactless charging module, and FIG. 1B is a perspective view of the contactless charging module.
The non-contact charging module 100 according to the present embodiment includes a charging coil 30 in which a conductive wire is wound in a planar shape, two NFC coils 40 arranged around the charging coil 30, and a magnetic sheet that supports the charging coil 30. 10. The number of NFC coils 40 may be one, three, four, or more.
The non-contact charging module 100 includes a sheet-like magnetic sheet 10 having an upper surface and a lower surface facing each other, and the charging coil 30 is placed (adhered) on the upper surface of the magnetic sheet 10. At least one, preferably a plurality of NFC coils 40 are arranged around the magnetic sheet 10 and the charging coil 30. In the present embodiment, two NFC coils 40 facing each other with the magnetic sheet 10 and the charging coil 30 in between are provided. The NFC coil 40 may be placed on the upper surface of the magnetic sheet 10. The coil axes of the two NFC coils 40 are substantially parallel to each other (may intersect at an angle of about −10 to +10 degrees), but may be in a substantially vertical or inclined relationship with each other. The NFC coil 40 is preferably wound around the magnetic body 20, thereby improving the communication efficiency of the NFC coil 40. The area of the upper surface of one magnetic body 20 is smaller than the area of the upper surface of the magnetic sheet 10. The coil axis A of the charging coil 30 and the coil axis B of the NFC coil 40 intersect with each other substantially at right angles (about 75 to 105 degrees). In the present embodiment, the magnetic sheet 10 and the magnetic body 20 are in contact via a protective tape or the like, but may be separated from each other. By being in contact with each other, the magnetic sheet 10 and the magnetic body 20 can be maximized in the miniaturized non-contact charging module 100.
The charging coil will be described in detail with reference to FIG.
FIG. 2 is a schematic view of a charging coil and a magnetic sheet in the embodiment of the present invention. FIG. 2A is an exploded view showing the arrangement relationship between the charging coil and the magnetic sheet, and FIG. 2B is a top view of the charging coil and the magnetic sheet.
In the present embodiment, charging coil 30 is wound in a substantially square shape, but may have any shape such as a substantially rectangular shape including a substantially rectangular shape, a circular shape, an elliptical shape, or a polygonal shape.
The charging coil 30 has two leg portions (terminals) 32a and 32b as a start end and a terminal end, and has a wire diameter of about 8 to 15 litz wires and a plurality of wires (preferably 0.08 mm to 0.00 mm). 2 to 15 conductors of 3 mm) are wound so as to draw a vortex on the surface around the hollow portion. For example, a coil wound with a litz wire consisting of 12 conductors having a wire diameter of 0.1 mm has much higher AC resistance due to the skin effect than a coil wound with one conductor having the same cross-sectional area. Go down. If the AC resistance during the operation of the coil decreases, the heat generated by the coil decreases, and the charging coil 30 with good thermal characteristics can be obtained. At this time, the power transmission efficiency can be improved by being a litz wire composed of 8 to 15 conductive wires of 0.08 mm to 1.5 mm. If it is a single wire, it is good in it being a conducting wire whose wire diameter is 0.2 mm-1 mm. Further, for example, three 0.2 mm conducting wires and two 0.3 mm conducting wires may be used to form one conducting wire like a litz wire. Further, the legs 32 a and 32 b as current supply units supply current from a commercial power source that is an external power source to the charging coil 30. The amount of current flowing through the charging coil 30 is about 0.4 A to 2 A. In the present embodiment, it is 0.7 A.
Charging coil 30 in the present embodiment has a substantially square hollow portion having a distance between opposing sides (length of one side) of 20 mm (preferably 15 mm to 25 mm), and a distance between opposing sides at a substantially square outer end ( The length of one side) is 30 mm (preferably 25 mm to 45 mm). The charging coil 30 is wound in a donut shape. When the charging coil 30 is wound in a substantially rectangular shape, the distance between the short sides (length of one side) of the substantially rectangular hollow portion is 15 mm (preferably 10 mm to 20 mm), and the distance between the long sides (one side) ) Is 23 mm (preferably 15 mm to 30 mm), the distance between the short sides facing each other (length of one side) at the outer end of the substantially square is 28 mm (preferably 15 mm to 35 mm), and the distance between the long sides ( The length of one side is 36 mm (preferably 20 mm to 45 mm). When the charging coil 30 is wound in a circular shape, the diameter of the hollow portion is 20 mm (preferably 10 mm to 25 mm), and the diameter of the circular outer end is 35 mm (preferably 25 mm to 45 mm). In addition, the thickness which combined the charging coil 30 and the magnetic sheet 10 in the state which laminated | stacked the charging coil 30 on the magnetic sheet 10 is 0.8 mm. In order to reduce the thickness, it is preferably 0.6 mm to 1 mm or less.
Moreover, the charging coil 30 is a secondary side (power receiving side), and a magnet is used for alignment with the coil of the primary side non-contact charging module in the charger that supplies power to the charging coil 30 that is a partner of power transmission. May be used. According to the standard (WPC), the magnet is a circular (coin-shaped) neodymium magnet, the diameter is about 15.5 mm (about 10 mm to 20 mm), and the thickness is about 1.5 mm to 2 mm. It has been established. The strength of the magnet may be about 75 mT to 150 mT. Since the distance between the coil of the primary side non-contact charging module and the charging coil 30 is about 2 mm to 5 mm, sufficient alignment can be achieved with this degree of magnet. The magnet is disposed in the hollow portion of the primary side or secondary side non-contact charging module coil. You may arrange | position in the hollow part of the charging coil 30 in this Embodiment.
That is, examples of the alignment method include the following methods. For example, a method of performing physical (formal) forced alignment, such as forming a protrusion on the charging surface of the charger and forming a recess on the secondary electronic device. Also, a method of performing alignment by attracting each other's magnets or one magnet and the other magnetic sheet by mounting magnets on at least one of the primary side and the secondary side. A method in which the primary side automatically moves the primary side coil to the position of the secondary side coil by detecting the position of the secondary side coil. A method that allows a portable device to be charged anywhere on the charging surface of the charger by providing the charger with a large number of coils.
As described above, there are various methods for positioning the coils of the general primary side (charging side) non-contact charging module and the secondary side (charged side) non-contact charging module, but magnets are used. It can be divided into a method and a method not using a magnet. The non-contact charging module 100 can be applied to both a primary side (charging side) non-contact charging module using a magnet and a primary side non-contact charging module not using a magnet. Charging is possible regardless of the type of the non-contact charging module, and convenience is improved.
Here, the influence of the magnet on the power transmission efficiency of the contactless charging module 100 will be described.
When a magnetic flux for electromagnetic induction is generated between the primary-side non-contact charging module and the non-contact charging module 100 for power transmission, the magnetic flux should avoid the magnet if there is a magnet between and around it. extend. Alternatively, the magnetic flux penetrating through the magnet becomes eddy current or heat generation in the magnet, resulting in loss. Furthermore, when the magnet is disposed in the vicinity of the magnetic sheet 10, the magnetic sheet 10 in the vicinity of the magnet is saturated and the magnetic permeability is lowered. Therefore, the magnet provided in the primary side non-contact charging module decreases the L value of the charging coil 30. As a result, the transmission efficiency between the non-contact charging modules decreases. In order to prevent this, in this embodiment, the hollow portion of the charging coil 30 is made larger than the magnet. That is, the area of the hollow portion is made larger than the area of the circular surface of the magnet on the coin so that the inner end of the charging coil 30 (the portion surrounding the hollow portion) is outside the outer end of the magnet. Moreover, since the diameter of a magnet is 15.5 mm or less, what is necessary is just to make a hollow part larger than the circle | round | yen with a diameter of 15.5 mm. As another method, the charging coil 30 may be wound into a substantially rectangular shape (including a square), and the diagonal line of the hollow portion of the substantially rectangular shape may be longer than the diameter of the magnet (maximum 15.5 mm). Thereby, since the corner part (four corners) where magnetic flux concentrates among the charging coils 30 wound in a substantially rectangular shape is positioned outside the magnet, the influence of the magnet can be suppressed. Below, the effect by said structure is shown.
FIG. 3 is a diagram showing a relationship between the primary side non-contact charging module including the magnet and the charging coil according to the embodiment of the present invention. 3A shows a case where the alignment magnet is used when the inner width of the charging coil is small, and FIG. 3B shows a case where the alignment magnet is used when the inner width of the charging coil is large. FIG. 3C shows a case where the alignment magnet is not used when the inner width of the charging coil is small, and FIG. 3D shows a case where the alignment magnet is not used when the inner width of the charging coil is large.
The primary side non-contact charging module 200 disposed in the charger includes a primary side coil 210, a magnet 220, and a magnetic sheet (not shown). FIG. 3 schematically shows the magnetic sheet 10, the charging coil 30, and the NFC coil 40 in the non-contact charging module 100.
The non-contact charging module 100 and the primary side non-contact charging module 200 are aligned so that the primary side coil 210 and the charging coil 30 face each other. A magnetic field is also generated between the inner portion 211 of the primary coil 210 and the inner portion 33 of the charging coil 30 to transmit power. The inner part 211 and the inner part 33 are opposed to each other. Further, the inner portion 211 and the inner portion 33 are also portions close to the magnet 220, and are easily affected by the magnet 220.
Furthermore, when the magnet 220 is disposed in the vicinity of the magnetic sheet 10 and the magnetic body 20, the magnetic permeability of the magnetic sheet 10 in the vicinity of the magnet 220 is lowered. Of course, the magnetic sheet 10 is closer to the magnet 220 than the magnetic body 20 and is easily affected by the magnet 220. Therefore, the magnet 220 provided in the primary side non-contact charging module 200 weakens the magnetic fluxes of the primary side coil 210 and the charging coil 30, particularly the inner portion 211 and the inner portion 33, and has an adverse effect. As a result, the transmission efficiency of non-contact charging is reduced. Therefore, in the case of FIG. 3A, the inner portion 33 that is easily affected by the magnet 220 is enlarged.
On the other hand, in FIG. 3C in which no magnet is used, since the number of turns of the charging coil 30 is large, the L value becomes large. As a result, since the numerical value greatly decreases from the L value in FIG. 3C to the L value in FIG. 3A, the magnet 220 is provided for alignment in a coil with a small inner width. In some cases, the L value reduction rate becomes very large.
If the inner width of the charging coil 30 is smaller than the diameter of the magnet 220 as shown in FIG. 3A, the charging coil 30 is directly affected by the magnet 220 as much as the area facing the magnet 220. Therefore, the inner width of the charging coil 30 is preferably larger than the diameter of the magnet 220.
On the other hand, when the inner width of the charging coil 30 is large as shown in FIG. 3B, the inner portion 33 that is easily affected by the magnet 220 becomes very small. Further, in FIG. 3D in which the magnet 220 is not used, since the number of turns of the charging coil 30 is reduced, the L value is smaller than that in FIG. As a result, since the decrease in the numerical value is small from the L value in FIG. 3D to the L value in FIG. 3B, the L value decrease rate can be kept small in the coil having a large inner width. Moreover, since the edge part of the hollow part of the charging coil 30 leaves | separates from the magnet 220, so that the inner width of the charging coil 30 is large, the influence of the magnet 220 can be suppressed.
On the other hand, since the non-contact charging module 100 is mounted on an electronic device or the like, the charging coil 30 cannot be formed in a certain size or larger. Accordingly, if the inner width of the charging coil 30 is increased to reduce the adverse effect from the magnet 220, the number of turns decreases, and the L value itself decreases regardless of the presence or absence of the magnet 220. Accordingly, the area of the magnet 220 and the area of the hollow portion of the charging coil 30 are substantially the same (the outer diameter of the magnet 220 is about 0 to 2 mm smaller than the inner width of the charging coil 30 or the area of the magnet 220 is If it is about 75% to 95% of the area of the hollow portion), the magnet 220 can be maximized, so the alignment accuracy between the primary side non-contact charging module and the secondary side non-contact charging module Can be improved. The area of the magnet 220 is smaller than the area of the hollow portion of the charging coil 30 (the outer diameter of the magnet 220 is about 2 to 8 mm smaller than the inner width of the charging coil 30, or the area of the magnet 220 is hollow in the charging coil 30. In the case where the inner portion 211 and the inner portion 33 face each other, the magnet 220 can be prevented from being present even if the alignment accuracy varies.
Moreover, as the charging coil 30 incorporated in the non-contact charging module 100 having the same horizontal width and vertical width, the influence of the magnet 220 can be suppressed when wound in a substantially rectangular shape rather than being wound in a circular shape. . That is, a comparison is made between a circular coil whose hollow portion has a diameter x and a substantially square coil whose distance between opposite sides (length of one side) of the hollow portion is x. At this time, when conducting wires having the same wire diameter are wound with the same number of turns, they are accommodated between the non-contact charging modules 100 having the same width. At this time, the diagonal length y of the hollow portion of the substantially square coil is y> x. Therefore, if the diameter of the magnet 220 is m, the distance between the innermost end of the circular coil and the magnet 220 is always (x−m) constant (x> m). On the other hand, the minimum distance between the innermost end portion of the substantially rectangular coil and the magnet 220 is (x−m), and the maximum is (ym) in the corner portions 31a to 31d. Further, if the charging coil 30 has corners such as corner portions 31a to 31d, magnetic flux concentrates on the corners during power transmission. That is, the corner portions 31a to 31d where the magnetic flux is most concentrated are farthest from the magnet 220, and the width (size) of the non-contact charging module 100 does not change. Therefore, the power transmission efficiency of the charging coil 30 can be improved without increasing the size of the contactless charging module 100.
Further, when the charging coil 30 is wound in a substantially rectangular shape, the size can be further reduced. That is, even if the short side of the hollow portion that is substantially rectangular is smaller than m, the four corner portions can be arranged outside the outer periphery of the magnet 220 if the long side is larger than m. Therefore, when the charging coil 30 is wound in a substantially rectangular shape around the substantially rectangular hollow portion, at least the long side of the hollow portion only needs to be larger than m. Note that the innermost end of the charging coil 30 is outside the magnet 220 provided in the primary-side non-contact charging module 200, or the four corners of the substantially rectangular hollow portion of the charging coil 30 wound in a substantially rectangular shape. Being outside the magnet 220 means something like that shown in FIG. That is, when the end of the circular surface of the magnet 220 is extended in the stacking direction and extended to the non-contact charging module 100, the region surrounded by the extension line fits in the hollow portion of the charging coil 30.
FIG. 4 shows the relationship between the charging coil inner diameter and the charging coil L value when the outer diameter of the charging coil is constant when the primary non-contact charging module is provided with a magnet and when the magnet is not provided. FIG. As shown in FIG. 4, when the size of the magnet 220 and the outer diameter of the charging coil 30 are made constant, the charging coil of the magnet 220 is increased by decreasing the number of turns of the charging coil 30 and increasing the inner diameter of the charging coil 30. The effect on 30 is reduced. That is, the L value of the charging coil 30 approaches when the magnet 220 is used for positioning the primary-side non-contact charging module 200 and the (secondary-side) non-contact charging module 100 and when it is not used. Therefore, the resonance frequency when the magnet 220 is used and when it is not used is very close. At this time, the outer diameter of the coil is unified to 30 mm. In addition, the distance between the end of the hollow portion of the charging coil 30 (the innermost end of the charging coil 30) and the outer end of the magnet 220 is greater than 0 mm and smaller than 6 mm, so that the L value is 15 μH or more. However, the L value between when the magnet 220 is used and when it is not used can be made closer.
Moreover, the conducting wire of the charging coil 30 may be a single conducting wire laminated in a plurality of stages, and this laminating direction is the same as the laminating direction in which the magnetic sheet 10 and the charging coil 30 are laminated. At this time, the layers of the conductive wires arranged vertically are stacked so as to leave a space between each other, so that the stray capacitance between the upper conductive wire and the lower conductive wire is reduced, and the AC resistance of the charging coil 30 is reduced. be able to. Moreover, the thickness of the charging coil 30 can be suppressed by being wound so as to close the space. By laminating the conductive wires in this way, the number of turns of the charging coil 30 can be increased and the L value can be improved. However, when the charging coil 30 is wound in a plurality of stages in the stacking direction, the AC resistance of the charging coil 30 is lowered when the winding is wound in one stage, and the transmission efficiency can be increased.
Further, when the charging coil 30 is wound in a polygon, corner portions (corners) 31a to 31d are provided as follows. The charging coil 30 wound in a substantially square shape is one in which the corners 31a to 31d at the corners 31a to 31d of the hollow portion have a radius of 30% or less of the side width of the hollow portion. That is, in FIG. 1B, the substantially square hollow portion has curved corners. The strength of the conducting wire at the four corners can be improved by being slightly curved rather than perpendicular. However, if R becomes too large, there is almost no change from the circular coil, and the effect unique to the substantially square charging coil 30 cannot be obtained. It was found that when the side width of the hollow portion is 20 mm, for example, if the radius R of the curve at each corner is 6 mm or less, the influence of the magnet 220 can be more effectively suppressed. Further, considering the strength of the four corners as described above, the effect of the most rectangular coil described above can be obtained when the radius R of the curve at each corner is 5 to 30% of the side width of the hollow portion of the substantially square shape. it can. Even in the charging coil 30 wound in a substantially rectangular shape, the radius R of the curve at each of the four corners is 5 to 30% of the side width (either the short side or the long side) of the hollow portion of the substantially rectangular shape. Thereby, the effect of the substantially rectangular coil mentioned above can be acquired. In the present embodiment, the corners of the four corners of the innermost end (hollow part) of charging coil 30 have R of 2 mm, preferably about 0.5 mm to 4 mm.
Further, when the charging coil 30 is wound in a rectangular shape, the leg portions 32a and 32b are preferably provided in the vicinity of the corner portions 31a to 31d. When the charging coil 30 is wound in a circle, no matter where the leg portions 32a and 32b are provided, the leg portions 32a and 32b can be provided at portions where the planar coil portion is wound in a curved line. When the conducting wire is wound in a curved shape, a force for maintaining the curved shape works, and even if the leg portions 32a and 32b are formed, the entire shape is not easily broken. On the other hand, in the case of a coil in which a conducting wire is wound in a rectangular shape, the force with which the coil tries to maintain the shape of the coil itself differs between the side portion (straight portion) and the corner portion. That is, in the corner portions 31a to 31d of FIG. However, the force to maintain the shape of the charging coil 30 is small at the side portion, and the conductive wire is easily unwound from the charging coil 30 with the curves of the corner portions 31a to 31d as axes. As a result, the number of turns of the charging coil 30 varies by, for example, about 1/8 turn, and the L value of the charging coil 30 varies. That is, the L value of the charging coil 30 varies. Therefore, it is preferable that the conducting wire bends the corner portion 31a immediately after the winding start point on the leg portion 32a side is close to the corner portion 31a. The winding start point and the corner portion 31a may be adjacent to each other. And it winds several times and becomes a point of the end of winding just before turning the corner part 31a, and a conducting wire becomes the leg part 32b and is bent to the outer side of the charging coil 30. At this time, the bending of the conducting wire bends more slowly at the winding end point than at the winding start point. This is to improve the force for maintaining the shape of the leg portion 32b.
Moreover, if a conducting wire is a litz wire, the force which tries to maintain the shape of the charging coil 30 will improve more. Since the litz wire has a large surface area, it is easy to fix the shape of the charging coil 30 with an adhesive or the like. On the other hand, when the conducting wire is a single wire, since the surface area per conducting wire is small, the surface area to be bonded is small, and the shape of the charging coil 30 is easy to unwind.
In the present embodiment, the charging coil 30 is formed using a conducting wire having a circular cross-sectional shape, but the conducting wire used may be a conducting wire having a square cross-sectional shape. When using a conducting wire having a circular cross-sectional shape, a gap is formed between adjacent conducting wires, so that the stray capacitance between the conducting wires is reduced, and the AC resistance of the charging coil 30 can be kept small.
[About magnetic sheet]
In addition, the magnetic sheet 10 includes a flat portion 12 on which the charging coil 30 is placed, a central portion 13 that is substantially in the center of the flat portion 12 and that corresponds to (opposes) the hollow region of the charging coil 30, and the charging coil 30. The slit 11 into which at least a part of the two leg portions 32a and 32b is inserted. The slit 11 may not be formed as shown in FIG. 1, and may be not only a slit shape penetrating but also a recess shape not penetrating as shown in FIG. 2. Although the slit shape is easier to manufacture and can securely store the conductive wire, the concave shape allows the volume of the magnetic sheet 10 to be increased, thereby improving the L value of the charging coil 30 and improving the transmission efficiency. be able to. The central portion 13 has a convex shape, a flat shape, a concave shape, or a shape that is a through hole with respect to the flat portion 12, and may be any shape. If it is a convex shape, the magnetic flux of the coil 21a can be strengthened. If flat, it is easy to manufacture and the coil 21a can be easily placed, and the balance between the influence of the magnet 220 for alignment described later and the L value of the coil 21a can be balanced. The concave shape and the through hole will be described in detail later.
Further, as the magnetic sheet 10, a Ni—Zn-based ferrite sheet (sintered body), a Mn—Zn-based ferrite sheet (sintered body), a Mg—Zn-based ferrite sheet (sintered body), or the like may be used. it can. A single-layer configuration may be used, a configuration in which a plurality of the same materials are stacked in the thickness direction, or a plurality of different magnetic sheets 10 may be stacked in the thickness direction. It is preferable that at least the magnetic permeability is 250 or more and the saturation magnetic flux density is 350 mT or more.
An amorphous metal can also be used as the magnetic sheet 10. When a ferrite sheet is used as the magnetic sheet 10, it is advantageous in that the AC resistance of the charging coil 30 is reduced. When an amorphous metal is used as the magnetic sheet 10, the charging coil 30 can be made thin.
The magnetic sheet 10 is substantially square and has a size of about 40 × 40 mm (35 mm to 50 mm). In the case of a substantially rectangular shape, the size is 35 mm (25 mm to 45 mm) on the short side and 45 mm (35 mm to 55 mm) on the long side. The thickness is 0.43 mm (actually between 0.4 mm and 0.55 mm and may be about 0.3 mm to 0.7 mm). The magnetic sheet 10 is desirably formed to be approximately the same or larger than the outer peripheral end of the magnetic body 20. Moreover, the shape of the magnetic sheet 10 may be a circle, a rectangle, a polygon, a rectangle having a large curve at four corners, and a polygon.
The slit 11 accommodates the lead wire of the leg portion 32 a from the winding start point 32 aa (the innermost portion of the coil) of the charging coil 30 to the lower end portion 14 of the magnetic sheet 10. This prevents the conductive wire from the winding start point 32aa to the leg 32a of the charging coil 30 from overlapping the planar winding portion of the charging coil 30 in the stacking direction. It is formed so as to be in contact with the central portion 13 of the magnetic sheet 10 and is substantially perpendicular to the end portion (end side). When the charging coil 30 is circular, the leg portions 32a and 32b can be formed without bending the winding start point 32aa of the conducting wire by forming the slit 11 so as to overlap the tangent of the central portion 13 (circular). . Further, when the charging coil 30 is substantially rectangular, the legs 11a and 32b are formed without bending the winding start of the conducting wire by forming the slit 11 so as to overlap the extended line of the side of the central portion 13 (substantially rectangular). can do. The length of the slit 11 depends on the inner diameter of the charging coil 30 and the size of the magnetic sheet 10, and is about 15 mm to 30 mm in the present embodiment.
Further, the slit 11 may be formed in a portion where the end (edge) and the center 13 of the magnetic sheet 10 are closest. That is, when the charging coil 30 is circular, the slit 11 is perpendicular to the tangent line of the end (end) of the magnetic sheet 10 and the center 13 (circular), and the slit 11 is formed short. Moreover, when the charging coil 30 is substantially rectangular, the slit 11 is formed to be short with respect to the end portion (end side) of the magnetic sheet 10 and the side of the center portion 13 (substantially rectangular shape). Thereby, the formation area of the slit 11 can be suppressed to the minimum, and the transmission efficiency of the non-contact power transmission device can be improved. In this case, the length of the slit 11 is about 5 mm to 20 mm. In either arrangement, the inner end of the slit 11 (slit) is connected to the central portion 13.
Next, an adverse effect on the magnetic sheet by the above-described magnet for alignment will be described. As described above, when the primary-side non-contact charging module 200 is provided with a magnet for alignment, the magnetic sheet 10 has a lower magnetic permeability particularly in the portion near the magnet 220 due to the influence of the magnet 220. Accordingly, the L value of the charging coil 30 varies greatly depending on whether or not the primary-side non-contact charging module 200 includes the magnet 220 for alignment. Therefore, it is necessary to make the magnetic sheet 10 the L value of the charging coil 30 that does not change as much as possible when the magnet 220 approaches or does not approach.
In addition, when the electronic device to be mounted is a mobile phone, the electronic device is often arranged between a case constituting the exterior of the mobile phone and a battery pack positioned inside the case or a case and a substrate positioned inside the case. Generally, since a battery pack is an aluminum casing, it adversely affects power transmission. This is because an eddy current is generated in aluminum in a direction in which the magnetic flux generated by the coil is weakened, so that the magnetic flux of the coil is weakened. Therefore, it is necessary to provide the magnetic sheet 10 between the aluminum that is the exterior of the battery pack and the charging coil 30 disposed on the exterior of the battery pack to reduce the influence on the aluminum. Moreover, the electronic components mounted on the board may interfere with the power transmission of the charging coil 30 and adversely affect each other. Therefore, it is necessary to provide the magnetic sheet 10 or a metal film between the substrate and the charging coil 30 to suppress the mutual influence.
In consideration of the above points, the magnetic sheet 10 used in the non-contact charging module 100 is used with a high magnetic permeability and saturation magnetic flux density, and it is important to increase the L value of the charging coil 30 as much as possible. What is necessary is just to have magnetic permeability 250 or more and saturation magnetic flux density 350 mT or more. In the present embodiment, the sintered body of Mn—Zn ferrite has a magnetic permeability of 1500 to 2500, a saturation magnetic flux density of 400 to 500, and a thickness of about 400 μm to 700 μm. However, Ni-Zn ferrite may be used, and if the magnetic permeability is 250 or more and the saturation magnetic flux density is 350 or more, good power transmission with the primary side non-contact charging module 200 is possible.
The charging coil 30 creates an LC resonance circuit using a resonance capacitor. At this time, if the L value of the charging coil 30 changes significantly depending on whether or not the magnet 220 provided in the primary-side non-contact charging module 200 is used for alignment, the resonance frequency with the resonance capacitor also greatly increases. Will change. Since this resonance frequency is used for power transmission (charging) between the primary-side non-contact charging module 200 and the non-contact charging module 100, if the resonance frequency changes greatly depending on the presence or absence of the magnet 220, power transmission cannot be performed correctly. End up. However, by adopting the above-described configuration, variation in the resonance frequency due to the presence or absence of the magnet 220 is suppressed, and power transmission is highly efficient in any situation.
Further, when the magnetic sheet 10 is a ferrite sheet and is based on Mn—Zn, the thickness can be further reduced. That is, according to the standard (WPC), the frequency of electromagnetic induction is determined to be about 100 kHz to 200 kHz (for example, 120 kHz). In such a low frequency band, the Mn—Zn ferrite sheet has high efficiency. Note that the Ni—Zn ferrite sheet is highly efficient at high frequencies. Therefore, in the present embodiment, the magnetic sheet 10 for non-contact charging that transmits power at about 100 kHz to 200 kHz is composed of a Mn—Zn based ferrite sheet, and the magnetic sheet for NFC communication that performs communication at about 13.56 MHz. The body 20 is composed of a Ni—Zn ferrite sheet. As described above, by configuring the magnetic sheet 10 and the magnetic body 20 with different types of ferrite, each can efficiently perform communication and power transmission. Even if the magnetic sheet 10 and the magnetic body 20 are made thinner and smaller, sufficient efficiency can be obtained.
Further, a hole may be formed in the central portion 13 of the magnetic sheet 10. In addition, any of a through-hole and a recessed part may be sufficient as a hole. Moreover, although a hole may be larger than the center part 13 and may be small, the smaller one is good. That is, when the charging coil 30 is placed on the magnetic sheet 10, the charging coil 30 may be larger or smaller than the hollow portion of the charging coil 30. When it is small, the entire charging coil 30 is placed on the magnetic sheet 10.
As described above, the contactless charging module 100 can be adapted to both the primary side (charging side) contactless charging module using a magnet and the primary side contactless charging module 200 not using a magnet. Thus, charging is possible regardless of the type of the primary side non-contact charging module 200, and convenience is improved. Then, the L value of the charging coil 30 when the primary non-contact charging module 200 is provided with the magnet 220 and the L value of the charging coil 30 when the magnet 220 is not provided are brought close to each other, and both L values are improved. Desired. Further, when the magnet 220 is disposed in the vicinity of the magnetic sheet 10, the magnetic permeability of the central portion 13 of the magnetic sheet 10 in the vicinity of the magnet 220 is lowered. Therefore, by providing a hole in the central portion 13, it is possible to suppress a decrease in magnetic permeability.
FIG. 5 is a diagram showing the relationship between the L value of the charging coil and the hollowing ratio of the central portion when the primary-side non-contact charging module is provided with a magnet and when it is not provided. In addition, the percentage of hollowing out means 100% means that the hole in the central portion 13 is a through hole, and the percentage of hollowing out means that no hole is provided. Furthermore, the percentage cut out means 50% means that a hole (concave portion) having a depth of 0.3 mm is provided on a magnetic sheet having a thickness of 0.6 mm, for example.
As shown in FIG. 5, the L value decreases as the hollowing ratio increases, when the primary-side non-contact charging module 200 is not provided with the magnet 220. At this time, the hollowing out ratio hardly decreases to 0% to 75%, but greatly decreases from 75% to 100%. On the other hand, when the magnet 220 is provided in the primary side non-contact charging module 200, the L value is improved as the hollowing ratio is increased. This is because it is less likely to be adversely affected by the magnet. At this time, the L value is gradually improved when the cut-out ratio is from 0% to 75%, and is greatly improved from 75% to 100%.
Therefore, when the cut-out ratio is 0% to 75%, the primary side non-contact charging module 200 has the magnet 220 while maintaining the L value when the primary side non-contact charging module 200 does not include the magnet 220. Can be improved. Further, when the hollowing ratio is 75% to 100%, the L value when the magnet 220 is not provided in the primary side non-contact charging module 200 and the case where the magnet 220 is provided in the primary side non-contact charging module 200. The L value can be made much closer. And it is most effective when the percentage of hollowing out is 40 to 60%, and the primary side non-contact is maintained while maintaining the L value when the magnet 220 is not provided in the primary side non-contact charging module 200. When the magnet 220 is provided in the charging module 200, the L value is improved by 1 μH or more, and when the magnet 220 is further provided, the magnet 220 and the magnetic sheet can sufficiently attract each other.
[About NFC coils and magnetic materials]
The NFC coil will be described in detail with reference to FIGS.
FIG. 6 is a perspective view when the NFC coil and the magnetic body in the present embodiment are assembled. FIG. 7 is an exploded view showing the arrangement of the NFC coil and the magnetic body in the present embodiment.
The NFC coil 40 in the present embodiment shown in FIG. 6 is an antenna that performs short-distance wireless communication that performs communication by electromagnetic induction using a frequency of 13.56 MHz, and a sheet antenna is generally used.
As shown in FIG. 6, the NFC coil 40 of this embodiment is a coil pattern that is arranged so as to wrap around the magnetic body 20 formed of ferrite or the like, and is formed on a support mainly made of resin. A flexible substrate 41 is provided as a conductor arrangement portion. The NFC coil 40 generates magnetic field lines for NFC communication for communicating with a wireless communication medium such as an IC card or an IC tag (not shown). 6 and 7, the specific shape of the coil pattern is not shown, but a coil pattern having a straight line S having an arrow as a coil axis is formed. The coil pattern and the adjustment pattern, which will be described later, are usually formed by a copper foil formed between two resin layers of the flexible substrate 41, such as a polyimide film and a coverlay or a resist.
Actually, as shown in FIG. 7, the flexible substrate 41 is divided into two parts with the magnetic body 20 in between. In this embodiment, for the sake of convenience, of these two flexible substrates 41, the side having the external connection terminals 42a, 42b is defined as the lower flexible substrate (first arrangement portion) 41a, and the other side is defined as the upper flexible substrate. A substrate (second arrangement portion) 41b is assumed. The lower flexible board 41a and the upper flexible board 41b are joined by solder. In this embodiment, the flexible substrate 41 is joined at two sides substantially parallel to the coil axis S. Further, “lower side” and “upper side” are given for convenience in order to facilitate understanding in FIG. 3, and may be turned upside down when being mounted on the device as the NFC coil 40.
In the present embodiment, the width of the upper flexible substrate 41b in the coil axis S direction is set so that the magnetic body 20 does not protrude. This is because, particularly when the magnetic body 20 is made of a ferrite that is easily broken, the fragments and residues are scattered in the communication device (for example, the portable terminal 1 in FIG. 1) in which the NFC coil 40 is incorporated, which adversely affects the communication device. This is to avoid giving them.
The size of the magnetic body 20 is 5 mm × 36 mm × 0.21 mm. The width in the longitudinal direction is preferably 25 mm to 50 mm. As shown in FIG. 1, it is preferable to form the magnetic sheet 10 to be larger than the width in the same direction. As a result, in NFC communication, there are portions (both ends) that are not easily affected by the charging coil 30 (hard to be coupled), so the efficiency of NFC communication can be improved. Moreover, the width | variety of a transversal direction should just be about 3-10 mm. It depends on the number of turns of the NFC coil 40. The thickness is preferably smaller than the thickness when the magnetic sheet 10 and the charging coil 30 are laminated, and preferably about 0.15 to 1 mm.
FIG. 8 is a diagram showing the wiring of the NFC coil in the present embodiment. FIG. 8A is a view of the lower flexible substrate 41a as viewed from the contact surface with the magnetic body 20, and FIG. 8B is a contact surface with the magnetic body 20 in any of the upper flexible substrate 41b. FIG. In these drawings, the arrow direction of the coil axis S is the front side in the perspective view of the flexible substrate 41 shown in FIGS. Further, the lower flexible substrate 41a has external connection terminals 42a and 42b in addition to the division pattern 43a. In this embodiment, these copper foils are also so-called “exposed” and soldered. A plating process is performed.
On the lower flexible substrate 41a, a plurality of divided patterns 43a, which are part of the NFC coil 40, are formed in parallel to each other and cross the coil axis S. A plurality of divided patterns 43b, which are also part of the coil pattern, are formed on the upper flexible substrate 41b so as to be parallel to each other and intersect the coil axis S. The copper foil is "exposed" at both ends of the plurality of divided patterns 43a and 43b by the pattern exposed portions 44a and 44b and the pattern exposed portions 45a and 45b, respectively.
The conductor pattern starting from the external connection terminal 42a on the lower flexible substrate 41a by repeating the solder bonding of the plurality of conductor patterns 43a and 43b divided across the magnetic body 20 as described above, After going around the magnetic body 20, it is connected to the external connection terminal 42b. A helical conductor pattern is formed around the coil axis S of the magnetic body 20. This spiral conductor pattern is a so-called coil pattern, and can generate magnetic lines of force for communicating with a wireless communication medium such as an IC card or an IC tag.
Incidentally, the conductor pattern formed on the flexible substrate 41 of this embodiment is not limited to the spiral coil pattern. As shown in FIG. 8A, an adjustment pattern u, which will be described in more detail below, is provided which is connected to the division pattern t located on one side of the outermost edge. The adjustment pattern u has a plurality of lead patterns v in which the divided pattern t and one end are connected. Further, the other end portions of the drawing patterns v not connected to the divided pattern t and the protruding side end portions (dotted lines) of the protruding portion drawing pattern z constituting a part of the protruding portion y of the divided pattern t. And an end portion located outside the outer shape of the magnetic body 20 shown in FIG.
In this embodiment, the adjustment pattern u is provided only on the lower flexible substrate 41a side. On the other hand, the plurality of divided patterns 43a and 43b forming the coil pattern shown in FIGS. 8A and 8B are divided and provided on both the lower flexible board 41a and the upper flexible board 41b. Yes. The lower flexible board 41a is provided with external connection terminals 42a and 42b in addition to the adjustment pattern u, and has a larger outer shape than the upper flexible board 41b. A part of these adjustment patterns u (that is, all of the connection patterns w and a part of the lead pattern v), a part of the protruding portion y of the divided pattern t, and the external connection terminals 42a and 42b are dotted lines. It arrange | positions on the outer side rather than the external shape of the magnetic body 20 and the upper side flexible substrate 41b to show. In other words, it can be said that a part of these adjustment patterns u is arranged away from the outer periphery of the magnetic body 20 and the upper flexible substrate 41b.
Accordingly, when the assembly of the NFC coil 40 shown in FIG. 6 is completed, the external connection terminals 42a and 42b are not covered with the magnetic body 20 and the upper flexible board 41b. Therefore, as shown in FIG. The antenna device can be configured by connecting to the electronic circuit board disposed on the surface.
The adjustment pattern not covered by the magnetic body 20 and the upper flexible substrate 41b has at least a connection pattern w. When one of the plurality of lead patterns v constituting the adjustment pattern or the protrusion lead pattern z constituting a part of the protrusion y of the divided pattern t is disconnected by trimming or the like, the NFC shown in FIG. When the assembly of the coil 40 is completed, the inductance can be adjusted.
The inductance of the NFC coil 40 is one factor that determines the resonance frequency of the antenna device when the NFC coil 40 in FIG. 1 is connected to an electronic circuit board on which a matching circuit and other antenna control units are mounted to form an antenna device. Is. The inductance of the NFC coil 40 having the structure of the present embodiment is greatly influenced by the size variation of the magnetic body 20. This is because the apparent permeability is different when the size of the magnetic body 20 is different.
As described above, since the inductance of the NFC coil 40 varies depending on the variation of the magnetic body 20, the resonance frequency of the antenna device on which the NFC coil 40 is mounted also varies. By adjusting the resonance frequency within a predetermined range from the center frequency (for example, 13.56 MHz for RF-ID) defined in the communication standard, wireless communication can be performed with high probability and quality. At this time, if the variation in inductance of the NFC coil 40 alone is reduced (for example, within ± 2%), the adjustment range necessary for adjusting the resonance frequency of the antenna device on which the NFC coil 40 is mounted is reduced. can do. Therefore, the line length of the coil pattern is adjusted to suppress the inductance variation of the NFC coil 40 due to the size variation of the magnetic body 20.
Trimming of the coil pattern for adjusting the inductance of the NFC coil 40 is performed at a portion outside the outer shape of the magnetic body 20 indicated by a dotted line in the drawing pattern v or the protruding portion drawing pattern z in FIG. Since these portions are not covered with the magnetic body 20 and the upper flexible substrate 41, the trimming operation can be easily performed.
For example, the magnetic body 20 of the case where only the protruding portion drawing pattern z in FIG. 8 is left and all the drawing patterns v are cut, and when only the drawing pattern v adjacent to the protruding portion drawing pattern z is left and all others are cut are shown. The difference in the number of turns of the coil pattern wound around is c.
Then, the inductance of the NFC coil 40 changes by an amount corresponding to the difference.
In FIG. 8, it is not always necessary to provide the projecting portion y positioned outside the outer shape of the magnetic body 20 in the divided pattern t constituting the coil pattern. However, if this protrusion y is present, as described above, the protrusion lead-out pattern z constituting a part of the protrusion y also contributes to the adjustment of the inductance of the coil pattern. Since the divided pattern t constituting the coil pattern has the protruding portion y positioned outside the outer shape of the magnetic body 20, even if the NFC coil 40 shown in FIG. A sufficient margin can be secured. 8 is a part that contributes to the adjustment of the inductance of the coil pattern together with the adjustment pattern u, and therefore must be provided on the flexible substrate on the same side as the adjustment pattern u.
FIG. 9 is a conceptual diagram showing an antenna device formed by an electronic circuit board and an NFC coil mounted on the portable terminal in the present embodiment, and magnetic lines of force generated from the antenna device.
As shown in FIG. 9, the antenna device in the present embodiment includes a magnetic body 20, an NFC coil 40, and an electronic circuit board disposed in the vicinity of the NFC coil 40. As is generally known, a wiring pattern for connecting terminals of circuit components mounted thereon is provided on the surface or inside of the electronic circuit board. With the miniaturization of today's integrated circuits, most electronic circuit boards have a plurality of wiring layers. Therefore, the power supply line and the GND (ground) line supplied to each circuit component are often provided as a wiring layer different from the wiring pattern described above. As a matter of course, these wiring patterns, power supply lines, and GND lines are conductors such as copper. That is, the electronic circuit board (metal body 50) can be regarded as a metal body. As described above, when the power supply line and the GND line are provided as separate wiring layers, these are formed over almost the entire surface of the assigned wiring layer, so that a particularly high-quality metal body is obtained.
As described above, in the antenna device including the NFC coil 40 and the electronic circuit board that can be regarded as a metal body, the opening of the coil part of the NFC coil 40 is perpendicular to the electronic circuit board. 40 is disposed at the end of the electronic circuit board. Note that the end of the electronic circuit board refers to the case where the end of the NFC coil 40 protrudes from the outermost end of the electronic circuit board, and the end of the NFC coil 40 than the outermost end of the electronic circuit board. Including both cases of being located inside.
The NFC coil 40 is arranged so that the opening of the NFC coil 40 is perpendicular to the electronic circuit board and the longitudinal direction of the NFC coil 40 is substantially parallel to the endmost part of the electronic circuit board (NFC coil 40 Are arranged along the extreme end of the electronic circuit board). Thereby, for example, even if the non-contact type IC card is positioned not only in the area P but also in the area Q, good communication can be performed.
That is, since the opening of the NFC coil 40 is perpendicular to the electronic circuit board, when a signal is input to the NFC coil 40 and a current flows, all the lines of magnetic force M generated from the NFC coil 40 are generated from the NFC coil 40 in the region Q. The magnetic field lines M pass only in one direction. As a result, a current flows through, for example, the non-contact type IC card located in the region Q, and the portable terminal equipped with the antenna device of this embodiment including the electronic circuit board and the NFC coil 40 communicates with the non-contact type IC card. It can be performed.
Also in the region P, when a signal is input to the NFC coil 40 and a current flows, in the region P, the magnetic field lines M are either one of the direction away from the NFC coil 40 or the direction toward the NFC coil 40. This is because the magnetic force lines M generated from the NFC coil 40 are attenuated near the electronic circuit board, so that the axis C of the magnetic force lines M is not perpendicular to the electronic circuit board and is inclined. As a result, a current flows through, for example, a non-contact type IC card located in the region P, and the portable terminal equipped with the antenna device of the present embodiment including the electronic circuit board and the NFC coil 40 communicates with the non-contact type IC card. It can be performed.
In addition, the magnetic field lines M shown in FIG. 9 have an axis C that connects the boundary between the magnetic field lines in the direction away from the NFC coil 40 and the magnetic field lines in the direction toward the NFC coil 40. For example, when a non-contact type IC card is positioned in the vicinity of the axis C of the magnetic force lines M, both the magnetic lines in the direction away from the antenna and the direction toward the antenna act on the non-contact type IC card and cancel each other. As a result, no current flows through the non-contact type IC card, and communication between the portable terminal equipped with the antenna device of this embodiment and the non-contact type IC card is not performed.
Next, the reason why the axis C of the magnetic force line M is inclined with respect to the electronic circuit board will be described. Eddy currents induced on the surface of the electronic circuit board facing the NFC coil 40 due to the magnetic field lines generated by the NFC coil 40 generate magnetic field lines in a direction perpendicular to the surface of the electronic circuit board facing the NFC coil 40. Therefore, the magnetic lines of force M generated from the NFC coil 40 and the magnetic lines of force generated from the eddy currents induced on the surface of the electronic circuit board facing the NFC coil 40 are combined, and the magnetic lines of force M generated from the NFC coil 40 are the electronic circuit board. It changes vertically in the vicinity. As a result, the axis C of the magnetic force line M is inclined to the side away from the electronic circuit board.
Further, since the NFC coil 40 is arranged at the end of the electronic circuit board, the magnetic field lines M on the electronic circuit board side (right side in FIG. 6) of the NFC coil 40 are attenuated and the NFC coil 40 is away from the electronic circuit board ( The magnetic field lines M on the left side in FIG. 6 are relatively strengthened. As a result, the axis C of the magnetic force line M is inclined with respect to the electronic circuit board. In the configuration of the present embodiment, the angle α of the axis C of the magnetic lines of force M is inclined to be about 40 ° to 85 ° with respect to the electronic circuit board. If the NFC coil 40 is not disposed at the end of the electronic circuit board, the magnetic field lines in the direction perpendicular to the electronic circuit board surface due to the eddy current on the electronic circuit board surface are reduced, and the axis C of the magnetic force lines M is the electronic circuit board. Remains almost perpendicular to. In that case, even if communication is possible in region Q, communication cannot be performed in region P.
The ends of the NFC coil 40 and the electronic circuit board may be arranged with the ends thereof aligned, or the ends of the NFC coil 40 may protrude beyond the ends of the electronic circuit board. Further, the end portion of the NFC coil 40 may be located inside the end portion of the electronic circuit board.
From the above, by positioning the NFC coil 40 at the end of the electronic circuit board, the current flowing through the electronic circuit board can be fully utilized. Further, if the angle α is about 85 °, the effect of the present invention can be obtained, and preferably 80 ° or less.
Next, the configuration of the non-contact charging module will be described. FIG. 10 is a schematic diagram of lines of magnetic force generated by the charging coil and the NFC coil in the present embodiment.
As shown in FIG. 10, the opening of the NFC coil 40 in the present embodiment is perpendicular to the metal body 50 and is disposed at the end of the metal body 50.
There are both cases where the NFC coil 40 protrudes from the outermost end portion of the metal body 50 and cases where the NFC coil 40 is located inside the outermost end portion of the metal body 50, which will be described later. The distance between the outer end of the NFC coil 40 and the outermost end of the metal body 50 is about −5 mm to +5 mm. Note that d is a negative value means that the outer end portion of the NFC coil 40 is located on the inner side of the outermost end portion of the metal body 50, and in this case, it is 2 cm inside. Indicates. Conversely, if d is a positive value, it indicates that the outer end portion of the NFC coil 40 protrudes outward from the outermost end portion of the metal body 50. Note that −5 mm to +5 mm is caused by the width of the magnetic body 20 in the short direction. That is, when the width of the magnetic body 20 in the short direction is d, the distance between the outer end of the NFC coil 40 and the outermost end of the metal body 50 is about −dmm to + dmm, so that the magnetic flux axis. Thereby, the NFC communication as described above can be performed satisfactorily.
Next, a case where the NFC coil is a sheet antenna will be described for comparison.
Even if the charging coil for non-contact charging and the NFC sheet antenna for NFC communication are in the opposite directions, the opening surfaces are directed in the same direction. This is because both of them are coiled in a plane, and in order to improve communication efficiency and charging efficiency, it is necessary to enlarge the respective openings, so that electronic devices that are required to be smaller and thinner This is because the above-mentioned configuration is inevitably obtained. That is, since both the non-contact charging module and the NFC sheet antenna mounted on the miniaturized electronic device casing are communication (power transmission) using electromagnetic induction, the charging coil and the opening surface of the NFC sheet antenna This is because the L value is improved by increasing.
Thus, when the direction of communication (the axis of the opening) is substantially the same, each other is easily influenced by the other party. That is, the NFC sheet antenna takes away the magnetic flux for power transmission between the contactless charging module of the charger for contactless charging and the charging coil on the charged side. Furthermore, the NFC sheet antenna also receives magnetic flux generated when the charging coil receives power. Therefore, the power transmission efficiency of the NFC sheet antenna is reduced, and the charging time is increased. Also, when short-range communication is performed using the NFC sheet antenna, an eddy current is generated in the charging coil in the direction of weakening the magnetic flux generated by the NFC sheet antenna. In other words, the charging coil for flowing a large current has a larger conductor thickness than an NFC sheet antenna that performs communication by flowing a small current. Therefore, when viewed from the NFC sheet antenna, the charging coil becomes a huge metal, and when viewed from the NFC sheet antenna, the eddy current generated in the charging coil cannot be ignored. Therefore, it has an adverse effect on the short-range communication efficiency and communication distance of the NFC sheet antenna.
Furthermore, unless the charging coil and the NFC sheet antenna are completely stacked centered on each other, there will be two large planar coils on the surface of the housing, and whichever is covered when viewed from the non-contact charging module on the charger side. It is difficult to determine whether the charging coil is for charging. When the alignment accuracy is lowered, the power transmission efficiency is lowered accordingly.
For example, when aligning, the non-contact charger (primary side) detects the position of the charging coil to automatically move the planar coil of the non-contact charger (primary side) to the position of the charging coil. There is a way. At this time, there is a detection method such as using the resonance frequency of the charging coil, but there is a possibility that the resonance frequency of the NFC sheet antenna is detected and aligned with the NFC sheet antenna.
In addition, there is a method in which a mobile terminal device can be charged anywhere on the charging surface of the non-contact charger (primary side) by arranging a large number of coils on the non-contact charger (primary side). In this case, the coil (primary side) close to the NFC sheet antenna transmits a large amount of magnetic flux that is not necessary for the NFC sheet antenna. As a result, there is a risk of wasteful power consumption or malfunction.
Furthermore, the magnet provided in the non-contact charger (primary side) may be attracted and aligned with the magnet provided in the magnetic sheet or the hollow portion of the charging coil. In this case, since the magnetic sheet for the NFC sheet antenna is saturated by the magnet and the magnetic permeability may be lowered, the L value of the NFC sheet antenna may be lowered. In that case, the communication distance and communication efficiency of the NFC sheet antenna may be reduced.
As a result of the above, the NFC sheet antenna faces the opening surface in substantially the same direction as the charging coil and generates magnetic flux in substantially the same direction. Therefore, regardless of the alignment method, the communication performance of the NFC sheet antenna and the charging coil The power transmission performance is adversely affected.
On the other hand, as shown in FIG. 10, when the NEC coil 40 of the present embodiment is used, the direction of the opening surfaces of the charging coil 30 and the NFC coil 40 and the directions of the winding axes A and B are made different. Therefore, the problems as described above do not occur, it is difficult to couple with each other, and each can perform good communication (power transmission).
That is, as shown in FIG. 10B, the coil axis A of the charging coil 30 is in the vertical direction in the figure. On the other hand, the coil axis B of the NFC coil 40 is in the left-right direction in the drawing. Thus, they are in a substantially vertical relationship with each other. As a result, it is difficult for the coils to be coupled to each other. In addition, what is necessary is just a grade which a mutual coil axis cross | intersects in the range of 80-100 degree | times.
Furthermore, with the non-contact charging module 100 of the present embodiment, the charging coil 30 and the NFC coil 40 can communicate in substantially the same direction. This is because the NFC coil 40 behaves as described in FIG. For this purpose, when a plurality of NFC coils 40 are provided, the NFC coils 40 may be wound so that the magnetic fluxes of all the NFC coils 40 extend in the same direction (for example, upward in FIG. 10B). That is, the two NFC coils 40 in FIG. 10A are both wound clockwise when viewed from the outside.
Note that the NFC coil 40 is preferably arranged on the end side rather than the center side of the metal body 50, and thus is preferably arranged outside the charging coil 30. As shown in FIG. 10, it is not always necessary to arrange the charging coil 30 around the charging coil 30. However, since the axis C of the magnetic flux is inclined by the metal body 50, the charging coil 30 is preferably arranged on both sides. In FIG. 10, two NFC coils 40 are connected in a loop shape so as to surround the charging coil 30.
For example, when the charging coil 30 is wound in a substantially rectangular shape and the NFC coil 40 is disposed along the long side, the non-contact charging module 100 can be reduced in size. And the non-contact charging module 1 can be reduced in size when the width of the longitudinal direction of the NFC coil 40 is substantially the same as the width of the charging coil 30 in the same direction. Further, in order to sufficiently tilt the magnetic flux axis C of the NFC coil 40, it is preferable that the magnetic sheet 10 is not disposed under the NFC coil 40.
Next, communication characteristics of the NFC coil in the non-contact charging module according to the present embodiment will be described with reference to FIGS.
FIG. 11 is a perspective view showing a portable terminal including a contactless charging module according to the present embodiment and a contactless charging module including a loop-shaped NFC coil for comparison. FIG. 12 is a diagram illustrating frequency characteristics of induced voltages of the two contactless charging modules illustrated in FIG. 11. FIG. 13 is a diagram showing the magnetic field in the YZ plane of each of the two contactless charging modules shown in FIG. FIG. 14 is a diagram illustrating the magnetic field in the ZX plane of each of the two contactless charging modules illustrated in FIG. 11. 11, 13, and 14, (a) is a case of a non-contact charging module provided with a loop-shaped NFC antenna for comparison, and (b) is a case of the non-contact charging module in the embodiment. Show the case.
In FIGS. 11A and 11B, the non-contact charging module 100 and the non-contact charging module 400 provided with the loop-shaped NFC antenna are placed on the battery pack 303 in the present embodiment. Is done. The power transmission direction of the charging coil 30 and the communication direction of the NFC coil 40 of the contactless charging modules 100 and 400 are the back surface of the portable terminal (the surface on which a display unit such as a liquid crystal screen is disposed is the front surface).
At this time, as shown in FIG. 12, the induced electromotive force of the NFC coil 40 of the contactless charging module 100 is larger than the induced electromotive force of the loop-shaped NFC coil of the contactless charging module 400. As a result, the NFC coil 40 of the non-contact charging module 100 has higher communication efficiency than the loop-shaped NFC coil of the non-contact charging module 400. Further, as is apparent from FIGS. 13 and 14, the NFC coil 40 of the non-contact charging module 100 can communicate with a wider area than the loop-shaped NFC coil of the non-contact charging module 400.
At this time, the non-contact charging module 400 in FIG. 11A and the non-contact charging module in FIG. 11B have substantially the same area (40 mm × 40 mm × 0.4 mm).
If the same magnetic sheet 10 and charging coil 30 are used in the non-contact charging module 100 and the non-contact charging module 400, the power transmission efficiency of the charging coil 30 does not change greatly. This is because the charging coil 30 is sufficiently larger than an antenna for NFC communication.
The charging coil 30 is for power transmission in non-contact charging, and transmits stage power for a long time. On the other hand, the communication by the NFC coil 40 is shorter in time than the charging coil 30 and requires less power during communication. As a result, the conducting wire constituting the charging coil 30 is thicker than the conducting wire constituting the NFC coil 40 and the number of turns is increased. Therefore, the charging coil 30 viewed from the NFC coil 40 is a large metal body, and the influence of the charging coil 30 on the NFC coil 40 is large. On the other hand, the NFC coil 40 viewed from the charging coil 30 is small, and the influence of the NFC coil 40 on the charging coil 30 is small.
Therefore, when the same magnetic sheet 10 and charging coil 30 are used in the non-contact charging module 100 and the non-contact charging module 400, the power transmission efficiency of the charging coil 30 is independent of the shape of the coil (antenna) for NFC communication. It does not change greatly.
As described above, when the axis A of the charging coil 30 and the axis B of the NFC coil 40 intersect each other, the charging coil 30 and the NFC coil can be prevented from interfering with each other. In particular, since the axis A of the charging coil 30 and the axis B of the NFC coil 40 are substantially orthogonal to each other, mutual interference can be most prevented.
The charging coil 30 is wound in a rectangular shape, and at least two NFC coils 40 are arranged along two opposing sides of the rectangular charging coil 30, thereby enabling a non-contact charging module to perform an NFC communication possible region. It can be spread in a balanced manner around 100. In particular, when mounted on a mobile terminal, even if the center of the charging coil 30 is arranged on the center side of the mobile terminal, the centers of the plurality of NFC coils 40 can be centered on the mobile terminal. As a result, it is possible to prevent the chargeable area and the NFC communicable area around the portable terminal from being biased.
Further, since the NFC coil 40 is disposed outside the magnetic sheet 10, the communication of the NFC coil 40 can be made efficient. Furthermore, since the magnetic sheet 10 and the magnetic body 20 are made of different types of ferrite, non-contact charging and NFC communication can be performed efficiently, respectively.
[About mobile devices]
FIG. 15 is a cross-sectional view schematically showing a portable terminal provided with the contactless charging module of the present embodiment. 15A to 15E, a display unit is provided on the upper surface side, and the lower surface side is a communication surface. Further, in the mobile terminal 300 of FIG. 15, components other than the housing 301, the substrate 302, the battery pack 303, and the non-contact charging module 100 are omitted, and FIG. 15 shows the housing 301, the substrate 302, and the battery pack 303. The arrangement relationship of the non-contact charging module 100 will be schematically described.
The mobile terminal 300 includes a substrate 302 that controls at least a part of the mobile terminal 300, a battery pack (power holding unit) 303 that temporarily stores received power, and the non-contact charging described above. A module 100 is provided. The display unit may have a touch panel function. In that case, the user operates the portable terminal by touching the display unit. Of course, the contactless charging module 100 is oriented so that the magnetic sheet 10 is on the display unit side (upper side in FIG. 15), and the charging coil 30 and the NFC coil 40 are on the back side of the housing 301 (lower side in FIG. 15). Placed in. Thereby, both the transmission direction of non-contact charging and the communication direction of the NFC coil can be on the back side of the housing 301 (the lower side in FIG. 15).
In FIG. 15A, among the substrate 302, the battery pack 303, and the non-contact charging module 100, the substrate 302 is disposed on the display unit side (upper side in FIG. 15), and the battery pack 303 is disposed on the back side of the substrate 302. The communication module 100 is closest to the rear surface side of the housing 301. The substrate 302 and the battery pack 303 are at least partially stacked, and the battery pack 303 and the non-contact charging module 100 are at least partially stacked. Thereby, it can prevent that the non-contact charge module 100, the electronic component mounted in the board | substrate 302, and the board | substrate 302 exert a bad influence (for example, interference) mutually. Moreover, since the battery pack 303 and the non-contact charging module 100 are arranged close to each other, they can be easily connected to each other. In particular, the areas of the substrate 302, the battery pack 303, and the non-contact charging module 100 can be sufficiently secured, and the degree of freedom in design is high. L values of the charging coil 30 and the NFC coil 40 can be sufficiently secured.
In FIG. 15B, among the substrate 302, the battery pack 303, and the non-contact charging module 100, the substrate 302 is disposed closest to the display unit (upper side in FIG. 15), and the battery pack 303 and the non-contact are disposed on the back side of the substrate 302. Contact charging modules 100 are arranged in parallel. That is, the battery pack 303 and the non-contact charging module 100 are not stacked and are arranged side by side in the horizontal direction of FIG. The substrate 302 and the battery pack 303 are at least partially stacked, and the substrate 302 and the non-contact charging module 100 are at least partially stacked. Thereby, since the battery pack 303 and the non-contact charging module 100 are not stacked, the casing 301 can be thinned. In particular, the areas of the substrate 302, the battery pack 303, and the non-contact charging module 100 can be sufficiently secured, and the degree of freedom in design is high. L values of the charging coil 30 and the NFC coil 40 can be sufficiently secured.
15C, among the substrate 302, the battery pack 303, and the non-contact charging module 100, the substrate 302 and the battery pack 303 are disposed on the most display side (the upper side in FIG. 15), and the back side of the battery pack 303. The non-contact charging module 100 is arranged in the above. That is, the battery pack 303 and the substrate 302 are not stacked and are arranged side by side in the horizontal direction of FIG. Battery pack 303 and non-contact charging module 100 are at least partially stacked. Accordingly, since the battery pack 303 and the substrate 302 are not stacked, the casing 301 can be thinned. In addition, since the battery pack 303 and the non-contact charging module 100 are stacked and the battery pack 303 and the non-contact charging module 100 are arranged close to each other, it is easy to connect each other. Moreover, the area of the board | substrate 302, the battery pack 303, and the non-contact charge module 100 can fully be ensured, and the L value of the charging coil 30 and the NFC coil 40 can fully be ensured.
In FIG. 15D, among the substrate 302, the battery pack 303, and the non-contact charging module 100, the substrate 302 and the battery pack 303 are arranged on the most display portion side (the upper side in FIG. 15), and on the back side of the substrate 302. A non-contact charging module 100 is arranged. That is, the battery pack 303 and the substrate 302 are not stacked and are arranged side by side in the horizontal direction of FIG. At least a part of the substrate 302 and the non-contact charging module 100 are stacked. Accordingly, since the battery pack 303 and the substrate 302 are not stacked, the casing 301 can be thinned. Generally, the battery pack 303 is the thickest among the substrate 302, the battery pack 303, and the non-contact charging module 100. Therefore, the case 301 can be made thinner by stacking the substrate 302 and the non-contact charging module 301 than by stacking the battery pack and other components. Moreover, the area of the board | substrate 302, the battery pack 303, and the non-contact charge module 100 can fully be ensured, and the L value of the charging coil 30 and the NFC coil 40 can fully be ensured.
In FIG.15 (e), the board | substrate 302, the battery pack 303, and the non-contact charge module 100 are arrange | positioned at the display part side (upper side of FIG. 15). That is, the substrate 302, the battery pack 303, and the non-contact charging module 100 are not stacked on each other, and are arranged side by side in the horizontal direction of FIG. Thereby, the housing | casing 301 can be thinned most.
DESCRIPTION OF SYMBOLS 100 Non-contact charge module 10 Magnetic sheet 11 Slit 12 Flat part 13 Center part 14 Lower end part 20 Magnetic body 21 Flat part 30 Charging coil 31a, 31b, 31c, 31d Corner part 32a, 32b Leg part 33 Inner part 40 NFC coil 50 Metal Body 200 Primary side non-contact charging module 210 Primary side coil 220 Magnet 300 Portable terminal 301 Case 302 Substrate 303 Battery pack
An NFC coil disposed around the charging coil,
The contactless charging module, wherein an axis of the charging coil and an axis of the NFC coil intersect each other.
The contactless charging module according to claim 1, wherein an axis of the charging coil and an axis of the NFC coil are substantially orthogonal to each other.
The charging coil is wound into a rectangle,
2. The contactless charging module according to claim 1, wherein at least two NFC coils are arranged along two opposing sides of the rectangular charging coil.
A magnetic sheet having a surface on which the entire charging coil is placed;
The contactless charging module according to claim 1, wherein the NFC coil is disposed outside the magnetic sheet.
Place the charging coil on the surface is placed on the surface of the magnetic sheet,
The NFC coil is wound around a magnetic material,
The contactless charging module according to claim 1, wherein the magnetic sheet and the magnetic body are made of different types of ferrite.
A portable terminal comprising the contactless charging module according to any one of claims 1 to 5.
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