JP5457478B2 - Mobile device - Google Patents

Description

  The present invention relates to a portable terminal having a planar coil portion made of a spiral conductive wire and a magnetic sheet.

  2. Description of the Related Art In recent years, many devices that can perform non-contact charging of a main device, which is a portable terminal, with a charger have been used. This is a transmitter contactless charging module on the charger side, a receiver contactless charging module on the mobile terminal side, and power is transmitted from the charger side to the main device side by generating electromagnetic induction between both modules. To do. It has also been proposed to apply a mobile terminal device or the like as the main device.

  The main device such as the portable terminal device and the charger are required to be thin and small. In order to meet this demand, it is conceivable to provide a planar coil portion as a transmitting-side non-contact charging module or a receiving-side non-contact charging module and a magnetic sheet as in (Patent Document 1).

JP 2006-42519 A

  In this type of contactless charging module, the position of the primary side contactless charging module (transmitting side contactless charging module) and the position of the secondary side contactless charging module (receiving side contactless charging module) need to be accurately aligned. is there. This is to efficiently perform electromagnetic induction for power transmission.

  There is a method of using a magnet as one of methods for accurately aligning the primary side non-contact charging module (transmission side non-contact charging module) and the secondary side non-contact charging module (receiving side non-contact charging module). . An example of this is the method shown in FIG. FIG. 13 is a diagram illustrating a state in which the contactless charging module is aligned by a magnet provided in the secondary contactless charging module that is the other contactless charging module. This is because the magnet is mounted on at least one of the primary side non-contact charging module or the secondary side non-contact charging module, and the mutual magnets or one magnet and the other magnetic sheet are attracted to perform alignment. Is the method.

  Further, as another method for accurately aligning the primary side non-contact charging module and the secondary side non-contact charging module, there is a method of aligning without using a magnet.

  For example, it is physically (formally) compulsory that a convex portion is formed on the charging surface of a charger equipped with a primary side non-contact charging module, and a concave portion is formed and fitted into an electronic device equipped with a secondary side non-contact charging module. This is a method for performing proper alignment. Further, the primary side non-contact charging module detects the position of the coil of the secondary side non-contact charging module so that the coil of the primary side non-contact charging module is automatically It is a method of moving to a position. Moreover, it is a method in which the portable device can be charged anywhere on the charging surface of the charger by providing the charger with a large number of coils.

  However, the L value of the coil provided in each non-contact charging module is large depending on whether the magnet is used to align the primary non-contact charging module and the secondary non-contact charging module or not. Change. The electromagnetic induction for power transmission uses the L value of the coil provided in each non-contact charging module to determine its resonance frequency.

  Therefore, there is a problem that it is difficult to share the non-contact charging module when the magnet is used for positioning the primary side non-contact charging module and the secondary side non-contact charging module.

  Therefore, in view of the above problems, the present invention uses or does not use the magnet provided in the transmission side non-contact charging module for alignment of the primary side non-contact charging module and the secondary side non-contact charging module. In any case, the change of the L value of the coil provided in the receiving side non-contact charging module provided in the portable terminal is suppressed, and either the case of using the magnet or the case of not using the magnet However, an object is to provide a portable terminal that can be used.

In order to solve the above-described problem, the present invention provides a mobile terminal including a reception-side planar coil unit that receives power by electromagnetic induction from a non-contact charger including a transmission-side planar coil unit, wherein the reception-side planar coil unit is In the case of positioning with the transmitting side planar coil part of the non-contact charger without using a magnet in its own hollow part, positioning is performed using the magnet provided in the hollow part of the transmitting side planar coil part. And a case where alignment is performed without using the magnet, the receiving-side planar coil portion around which a conducting wire is wound, and a magnetic sheet on which the coil surface of the receiving-side planar coil portion is placed, and a housing that accommodates the arranged display the receiving planar coil portion and the magnetic sheet to the surface, from the rear side of the housing, a forward on the receiving side planar coil portion and the magnetic sheet And location, the hollow portion of said receiving-side planar coil portion, it was a mobile terminal, wherein greater than the magnet provided to the transmitting-side non-contact charging module.

  According to the present invention, in the case where the magnet provided in the transmitting side non-contact charging module is used or not used for the alignment of the primary side non-contact charging module and the secondary side non-contact charging module. Even if there is no magnet, the L value of the coil provided in the receiving side non-contact charging module provided in the portable terminal is not changed. A portable terminal capable of transmission can be obtained.

The block diagram which shows the non-contact electric power transmission apparatus in embodiment of this invention The figure which shows the structure of the non-contact charger in embodiment of this invention The figure which shows the primary side non-contact charge module in embodiment of this invention Detailed drawing which shows the primary side non-contact charge module in the form of execution of this invention The figure which shows the structure of the portable terminal device in embodiment of this invention The figure which shows the secondary side non-contact charge module in embodiment of this invention Detailed view showing a secondary side non-contact charging module in an embodiment of the present invention The figure which shows the relationship between a primary side non-contact charge module provided with a magnet, and a secondary side non-contact charge module The figure which shows the relationship between the internal diameter of a coil, and the L value of a coil The schematic diagram which shows the positional relationship of the magnet with which the non-contact charge module in embodiment of this invention was equipped with the other non-contact charge module which performs electric power transmission. The conceptual diagram of the magnetic sheet of the non-contact charge module in embodiment of this invention The figure which shows the relationship between the L value of the coil of a non-contact charging module, and the thickness of center part in the case where it is not provided with the case where a magnet is provided for position alignment in the other non-contact charging module of this Embodiment The figure which shows a mode that a non-contact charging module is aligned with the magnet with which the secondary non-contact charging module which is the other non-contact charging module was equipped.

Invention of Claim 1 is a portable terminal provided with the receiving side planar coil part which receives electric power by electromagnetic induction from the non-contact charger provided with a transmitting side planar coil part, Comprising: The said receiving side planar coil part is self In the case where the hollow portion of the non-contact charger is not provided with a magnet and the positioning is performed using the magnet provided in the hollow portion of the transmission-side planar coil portion when the positioning is performed with the transmission-side planar coil portion of the contactless charger. In the case where alignment is performed without using the magnet, the receiving-side planar coil portion around which a conducting wire is wound, a magnetic sheet on which the coil surface of the receiving-side planar coil portion is placed, and a surface A display unit and a housing that houses the reception-side planar coil unit and the magnetic sheet, and from the back side of the housing, the reception-side planar coil unit and the magnetic sheet are sequentially arranged, Previous The hollow portion of the receiving-side planar coil portion, a mobile terminal being larger than the magnet provided to the transmitting-side non-contact charging module. Thereby, when using the magnet with which the non-contact charge module of the transmission side is used for alignment of the non-contact charge module of the primary side and the non-contact charge module of the secondary side with which the portable terminal was equipped, either Even in this case, since the L value of the coil provided in the non-contact charging module on the transmission side is not changed, the reception that can be used both in the case of using the magnet and in the case of not using the magnet A side non-contact charging module and a receiving side non-contact charging device using the same can be provided.

The invention described in claim 2 is characterized in that a distance between the end of the hollow portion of the receiving-side planar coil portion and the magnet is larger than 0 mm and smaller than 6 mm. As a result, the L value can be made closer to when the magnet 30a is used and not used while the L value is set to 15 μH or more.

The invention according to claim 3, wherein the receiving-side planar coil portion, in a plane parallel to the receiving-side planar coil portion, the area of the magnet, 70% of the area of the hollow portion of said receiving-side planar coil portions - It is characterized by being configured to be 95%. Thereby, it is possible to sufficiently cope with variations in alignment accuracy, and further, it is possible to improve alignment accuracy between the primary side non-contact charging module and the secondary side non-contact charging module.

The invention according to claim 4 is characterized in that an area of the receiving-side planar coil portion is larger than a circle having a diameter of 15.5 mm. Thereby, it can be set as the portable terminal which can be used with respect to any magnet in any case of using a magnet and not using a magnet.

(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a non-contact power transmission device according to an embodiment of the present invention.

The non-contact power transmission device includes a primary-side non-contact charging module 41 (transmitting-side non-contact charging module) and a secondary-side non-contact charging module 42 (receiving-side non-contact charging module). Utilizing this, power is transmitted from the primary side non-contact charging module 41 to the secondary side non-contact charging module 42. This non-contact power transmission device is used for power transmission of about 5 W or less. The frequency of power transmission is about 110 to 205 kHz. The primary side non-contact charging module 41 is mounted on, for example, a charger, and the secondary side non-contact charging module 42 is mounted on, for example, a mobile phone, a digital camera, a PC, or the like.

  The primary side non-contact charging module 41 includes a primary side coil 21a, a magnetic sheet 51, a resonance capacitor (not shown), and a power input unit 71. The power input unit 71 is connected to a commercial power supply 300 as an external power supply, receives power supply of about 100 to 240 V, converts it into a predetermined current 1 (DC 12 V, 1 A), and supplies it to the primary coil 21 a. The primary coil 21a generates a magnetic field according to its shape, number of turns, and supplied current. The resonance capacitor is connected to the primary side coil 21a and determines the resonance frequency of the magnetic field generated from the primary side coil 21a according to the relationship with the primary side coil 21a. The electromagnetic induction action from the primary side non-contact charging module 41 to the secondary side non-contact charging module 42 is performed by this resonance frequency.

  On the other hand, the secondary side non-contact charging module 42 includes a secondary side coil 21b, a magnetic sheet 52, a resonance capacitor (not shown), a rectifier circuit 72, and a power output unit 82. The secondary side coil 21b receives the magnetic field generated from the primary side coil 21a, converts the magnetic field into a predetermined current 2 by electromagnetic induction, and passes the secondary side through the rectifier circuit 72 and the power output unit 82. Output to the outside of the non-contact charging module 42. The rectifier circuit 72 rectifies the predetermined current 2 which is an alternating current and converts it into a predetermined current 3 which is a direct current (DC 5V, 1.5A). The power output unit 82 is an external output unit of the secondary side non-contact charging module 42, and power is supplied to the electronic device 200 connected to the secondary side non-contact charging module 42 via the power output unit 82. Do.

  Next, the case where the primary side non-contact charging module 41 is mounted on a non-contact charger will be described.

  FIG. 2 is a diagram showing a configuration of the non-contact charger in the embodiment of the present invention. In addition, the non-contact charger shown in FIG. 2 is shown so that the inside can be understood.

  A non-contact charger 400 that transmits electric power using electromagnetic induction has a primary-side non-contact charging module 41 inside a case that constitutes its exterior.

  The non-contact charger 400 has a plug 401 that is plugged into an outlet 301 of a commercial power supply 300 installed indoors or outdoors. By inserting the plug 401 into the outlet 301, the non-contact charger 400 can be supplied with power from the commercial power source 300.

  The non-contact charger 400 is installed on the desk 501, and the primary-side non-contact charging module 41 is disposed in the vicinity of the surface 402 opposite to the desk surface side of the non-contact charger 400. And the main plane of the primary side coil 21a in the primary side non-contact charge module 41 is arrange | positioned in parallel with the surface 402 on the opposite side to the desk surface side of the non-contact charger 400. FIG. By doing in this way, the electric power reception work area of the electronic device carrying the secondary side non-contact charge module 42 is securable. The non-contact charger 400 may be installed on a wall surface. In this case, the non-contact charger 400 is disposed in the vicinity of the surface opposite to the wall surface side.

  Further, the primary side non-contact charging module 41 may include a magnet 30 a used for alignment with the secondary side non-contact charging module 42. In this case, it arrange | positions in the hollow part located in the center area | region of the primary side coil 21a.

  Next, the primary side non-contact charging module 41 will be described.

  FIG. 3 is a diagram showing the primary side non-contact charging module in the embodiment of the present invention, and shows a case where the primary side coil is a circular coil. In FIG. 3, a circular coil wound in a circle is described, but a rectangular coil wound in a substantially rectangular shape may be used. In addition, about the detail of the primary side non-contact charge module demonstrated from now on, it applies to a secondary side non-contact charge module fundamentally. The difference of the secondary side non-contact charging module with respect to the primary side non-contact charging module will be described in detail later.

  The primary side non-contact charging module 41 includes a primary side coil 21a in which a conducting wire is wound in a spiral shape, and a magnetic sheet 51 provided so as to face the surface of the primary side coil 21a.

  As shown in FIG. 3, the primary coil 21a includes a coil 21a wound with a conductor in a radial direction so as to draw a vortex on the surface, and a terminal 22a as a current supply unit provided at both ends of the coil 21a. , 23a. That is, the terminals 22a and 23a serving as current supply units supply the current from the commercial power supply 300, which is an external power supply, to the primary coil 21a. The coil 21a is obtained by winding a conductive wire in parallel on a plane, and a surface formed by the coil is called a coil surface. The thickness direction is the direction in which the primary coil 21a and the magnetic sheet 51 are stacked.

  In addition, the magnetic sheet 51 includes a flat portion 31a on which the primary coil 21a is placed, a central portion 32a in the central portion of the flat portion 31a and corresponding to the hollow area of the coil 21a, and a lead wire of the coil 21a. It is comprised from the linear recessed part 33a in which one part is inserted. The central portion 32a has a convex shape, a flat shape, a concave shape, or a shape that is a through hole with respect to the flat portion 32a, and may be any shape. If it is a convex shape, the magnetic flux of the coil 21a can be strengthened. If it is flat, it is easy to manufacture and the coil 21a can be easily placed, and the influence of the magnet 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.

  In the primary side non-contact charging module 41 in the present embodiment, the coil 21a is wound outward from the inner diameter of 20 mm in diameter, and the outer diameter is 30 mm. That is, the coil 21a is wound in a donut shape. The coil 21a may be wound in a circular shape or may be wound in a polygonal shape.

  Further, by winding the conductive wires so as to leave a space between them, the stray capacitance between the upper conductive wire and the lower conductive wire is reduced, and the AC resistance of the coil 21a can be kept small. Moreover, the thickness of the coil 21a can be suppressed by winding so that space may be packed.

  Further, the primary side non-contact charging module 41 may include a magnet 30 a used for alignment with the secondary side non-contact charging module 42. This is determined by the standard (WPC) to be circular, the diameter is 15.5 mm or less, and the like. The magnet 30a has a coin shape and must be arranged so that the center thereof coincides with the winding center axis of the primary coil 21a. This is to reduce the influence of the magnet 30a on the primary coil 21a.

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 aligning the coils of the primary side (charging side) non-contact charging module and the secondary side (charged side) non-contact charging module. It is divided into the method that does not use. And if it is a primary side (charge side) non-contact charge module, the secondary side (charged side) non-contact charge module which uses a magnet and the secondary side (charge side) non-contact charge module which does not use a magnet By being able to adapt to both, it can charge regardless of the type of a secondary side (charged side) non-contact charge module, and the convenience improves. Similarly, if it is a secondary (charged) non-contact charging module, a primary (charging) non-contact charging module using a magnet and a primary (charging) non-contact charging module using a magnet. By being able to adapt to both, it can charge irrespective of the type of a primary side (charge side) non-contact charge module, and the convenience improves. That is, in the non-contact charging module that transmits power by electromagnetic induction with the other non-contact charging module that is the counterpart of power transmission, the other non-contact charging module is provided for alignment with the other non-contact charging module. A first means for aligning using a magnet and a second means for aligning without using a magnet, both of which can be aligned with the other non-contact charging module and transmit power It is necessary to configure so as to be possible.

  When the primary-side non-contact charging module 41 includes the magnet 30a, the first method of arranging the magnet 30a is a method of arranging the magnet 30a on the upper surface of the central portion 32a of the magnetic sheet 51. Further, as a second method of arranging the magnet 30a, there is a method of arranging the magnet 30a instead of the central portion 32a of the magnetic sheet 51. In the second method, since the magnet 30a is disposed in the hollow region of the coil 21a, the primary-side non-contact charging module 41 can be reduced in size.

  Note that the magnet 30a shown in FIG. 3 is not necessary when a magnet is not used for positioning the primary side non-contact charging module 41 and the secondary side non-contact charging module 42.

  Here, the influence of the magnet on the power transmission efficiency of the contactless charging module will be described. Generally, a magnet is provided in a through-hole of a built-in coil in at least one of a primary side non-contact charging module and a secondary side non-contact charging module. Accordingly, the magnet and the magnet or the magnet and the magnetic sheet 51 can be brought as close as possible, and at the same time, the primary side and secondary side coils can be brought close to each other. The magnet is circular, and in this case, the diameter of the magnet is smaller than the inner width of the coil 21a. In the present embodiment, the magnet has a diameter of about 15.5 mm (about 10 mm to 20 mm) and a thickness of about 1.5 to 2 mm. Further, a neodymium magnet is used, and the strength may be about 75 mT to 150 mT. In the present embodiment, since the interval between the coil of the primary side non-contact charging module and the coil of the secondary side non-contact charging module is about 2 to 5 mm, it is possible to sufficiently align with such a magnet. .

  When a magnetic flux is generated between the primary side coil and the secondary side coil for power transmission, if a magnet exists between and around the primary side coil and the secondary side coil, the magnetic flux extends to avoid the magnet. 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, the magnetic permeability of the magnetic sheet in the vicinity of the magnet is lowered. Therefore, the magnet 30a provided in the primary side non-contact charging module 41 reduces the L value of both the primary side coil 21a and the secondary side coil 21b. As a result, the transmission efficiency between the non-contact charging modules decreases.

  FIG. 4 is a detailed view showing the primary side non-contact charging module in the embodiment of the present invention. 4A is a top view of the primary-side non-contact charging module, and FIG. 4B is a cross-sectional view taken along line AA of the primary-side non-contact charging module in FIG. 4A. FIG.4 (c) is BB sectional drawing of the primary side non-contact charging module in Fig.4 (a) at the time of providing a linear recessed part. FIG.4 (d) is BB sectional drawing of the primary side non-contact charge module in Fig.4 (a) at the time of providing a slit. 4A and 4B show a case where the magnet 30a is not provided. In addition, when provided, the magnet 30a shown with the dotted line is provided.

  In order to achieve a reduction in the thickness of the non-contact charger 400 to which the primary-side non-contact charging module 41 is attached, the coil 21a has a thickness of 2 to the terminal 23a from the winding start portion located in the central region of the coil 21a. The remaining area is one stage. At this time, the upper conductor and the lower conductor are wound so as to leave a space between each other, thereby reducing the stray capacitance between the upper conductor and the lower conductor and reducing the AC resistance of the coil 21a. Can be suppressed.

  When conducting wires are stacked and the coil 21a is extended in the thickness direction of the primary side non-contact charging module 41, the number of turns of the coil 21a can be increased to increase the current flowing through the primary side coil 21a. When the conductors are stacked, the conductors located in the upper stage and the conductors located in the lower stage are wound so as to close each other's space, thereby suppressing the thickness of the coil 21a and increasing the current flowing through the primary coil 21a. it can.

  In the present embodiment, the coil 21a is formed using a conducting wire having a circular cross-sectional shape, but the conducting wire to be 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 coil 21a can be kept small.

In addition, the coil 21a is wound in one step rather than being wound in two steps in the thickness direction, so that the alternating current resistance of the coil 21a is reduced, and the transmission efficiency can be increased. This is because when a conducting wire is wound in two stages, stray capacitance is generated between the upper conducting wire and the lower conducting wire. Therefore, it is better to wind as many portions as possible in one stage rather than winding the entire coil 21a in two stages. Further, the primary side non-contact charging module 41 can be thinned by winding in one stage. In addition, when the planar coil part 2 is comprised with two conducting wires, since two conducting wires are electrically connected by solder etc. in the terminal 22a and 23a part, two conducting wires are one thick conducting wire. It may be as follows. The two conducting wires may be wound in parallel with the coil surface, or may be wound in parallel with the coil surface. That is, in the case of being parallel to the coil surface, the two conducting wires are planar and are wound around the same center, and one conducting wire is sandwiched between the other conducting wires in the radial direction. Thus, even if it is the same cross-sectional area, thickness can be restrained by electrically joining two conducting wires in terminal 22a and 23a part, and making it function like one conducting wire. That is, for example, the cross-sectional area of a conducting wire having a diameter of 0.25 mm can be obtained by preparing two conducting wires having a diameter of 0.18 mm. Therefore, if the diameter of one conducting wire is 0.25 mm, the thickness of one turn of the coil 21 is 0.25 mm, the radial width of the coil 21 is 0.25 mm, but the conducting wire 2 having a diameter of 0.18 mm. In the case of a book, the thickness of one turn of the coil 21 is 0.18 mm, and the width in the radial direction is 0.36 mm. The thickness direction is the direction in which the planar coil portion 2 and the magnetic sheet 51 are laminated. Further, the coil 21 may be overlapped in two steps in the thickness direction only in a part on the center side, and the remaining outer portion may be one step. Further, in the case of being perpendicular to the coil surface, the thickness of the contactless charging module 1 is increased, but the current flowing through the planar coil portion 2 can be increased by effectively increasing the cross-sectional area of the conducting wire, and sufficient winding The number can be easily secured. In the present embodiment, the primary side coil 21a is constituted by a conducting wire of about 0.18 to 0.35 mm, and among these, the primary side coil 21a of the primary side non-contact charging module 41 has a value of 0. 25
A lead wire of .about.0.35 mm is preferred.

  In addition, since the loss in the coil 21a is prevented because the AC resistance of the coil 21a is low and the L value is improved, the power transmission efficiency of the primary side non-contact charging module 41 depending on the L value can be improved.

  In the present embodiment, the coil 21a is formed in an annular shape (circular shape). The shape of the coil 21a is not limited to an annular shape (circular shape), and may be an elliptical shape, a rectangular shape, or a polygonal shape. Considering the alignment of the primary side non-contact charging module 41 and the secondary side non-contact charging module 42, the shape of the coil 21a is preferably annular (circular). This is because when the shape of the coil 21a is annular (circular), power can be transmitted and received in a wider range, so the coil 21a of the primary side non-contact charging module 41 and the coil of the secondary side non-contact charging module 42 21b can be easily aligned. That is, in order to enable transmission / reception of power in a wider range, the secondary side non-contact charging module 42 is less susceptible to the angle with respect to the primary side non-contact charging module 41.

  The terminals 22a and 23a may be close to each other or may be arranged apart from each other, but the primary side non-contact charging module 41 is easier to mount if they are arranged apart.

  The magnetic sheet 51 is provided in order to improve the power transmission efficiency of non-contact charging using electromagnetic induction, and includes a flat portion 31a and a central portion 32a that is the center and corresponds to the inner diameter of the coil 21. And a linear recess 33a. When the magnet 30a for positioning the primary side non-contact charging module 41 and the secondary side non-contact charging module 42 is provided, the magnet 30a may be disposed above the center portion 32a, or the magnet 30a may be positioned at the center portion. You may arrange | position instead of 32a.

  As the magnetic sheet 51, a Ni—Zn ferrite sheet, a Mn—Zn ferrite sheet, a Mg—Zn ferrite sheet, or the like can be used. The magnetic sheet 51 may have a single layer configuration, a configuration in which a plurality of the same materials are stacked in the thickness direction, or a plurality of different magnetic sheets 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 51. When a ferrite sheet is used as the magnetic sheet 51, it is advantageous in that the AC resistance of the coil 21a is reduced. When an amorphous metal is used as the magnetic sheet, the coil 21a can be thinned.

  The magnetic sheet 51 used for the primary-side non-contact charging module 41 has a size that fits within about 50 × 50 mm and has a thickness of about 3 mm or less. In the present embodiment, the magnetic sheet 51 is approximately 33 mm × 33 mm having a substantially square shape. It is desirable that the magnetic sheet 51 be formed to be approximately the same or larger than the outer peripheral end of the coil 21a. Moreover, the shape of the magnetic sheet 51 may be a circle, a rectangle, a polygon, a rectangle having a large curve at each corner, or a polygon.

  The linear recess 33a or the slit 34a accommodates the lead wire from the coil winding start portion (the innermost portion of the coil) to the terminal. Thereby, it can prevent that the conducting wire from the winding start part of a coil to a terminal overlaps in the thickness direction of the coil 21a, and can suppress the thickness of the primary side non-contact charging module 41. Further, by setting the size of the linear recess 33a or the slit 34a to the minimum size for accommodating the conductive wire from the coil winding start portion to the terminal, the generation of leakage magnetic flux can be suppressed. Further, the cross-sectional shape of the linear recess 33a is not limited to a rectangular shape, and may be an arc shape or rounded.

  The linear recess 33a or the slit 34a is formed so as to be substantially perpendicular to the end of the magnetic sheet 51 where one end of the slit 34a intersects, and to overlap the outer shape of the center 32a (on the tangential line for a circular coil or on the side for a rectangular coil). Is done. Thus, by forming the linear recess 33a or the slit 34a, the terminals 22a and 23a can be formed without bending the winding start of the conducting wire. The length of the linear recess 33a or the slit 34a depends on the inner diameter of the coil 21, and is about 15 mm to 20 mm in the present embodiment.

  Moreover, you may form the linear recessed part 33a or the slit 34a in the part which the outer periphery of the edge part of the magnetic sheet 51 and the center part 32a approaches most. Thereby, the formation area of the linear recessed part 33a or the slit 34a can be suppressed to the minimum, and the transmission efficiency of a non-contact electric power transmission apparatus can be improved. In this case, the length of the linear recess 33a or the slit 34a is about 5 mm to 10 mm. In either arrangement, the inner end of the linear recess 33a or the slit 34a is connected to the center 32a.

  Further, the linear recess 33a or the slit 34a may be arranged in another manner. That is, it is desirable that the coil 21a has a one-stage structure as much as possible. In that case, all the turns in the radial direction of the coil 21a have a one-stage structure, or one part has a one-stage structure and the other part has a two-stage structure. It is possible to do. Accordingly, one of the terminals 22a and 23a can be drawn from the outer periphery of the coil 21a, but the other must be drawn from the inside. When the portion around which the coil 21a is wound and the portion from the winding end of the coil 21a to the terminal 22a or 23a always overlap in the thickness direction, a linear recess 33a or slit 34a may be provided in the overlapping portion. .

  If the linear recess 33a is used, the magnetic sheet 51 is not provided with a through hole or a slit, so that magnetic flux can be prevented from leaking and the power transmission efficiency of the primary side non-contact charging module 41 can be improved. On the other hand, in the case of the slit 34a, the magnetic sheet 51 can be easily formed. When it is the linear recessed part 33a, it is not limited to the linear recessed part 33a in which a cross-sectional shape becomes a square shape, You may be circular arc shape or round.

  Next, the influence which a magnet has on the primary side non-contact charging module 41 and a secondary side non-contact charging module 42 described later will be described. The secondary side coil 21b in the secondary side non-contact charging module 42 receives the magnetic field generated by the primary side non-contact charging module 41 and performs power transmission. Here, if magnets are arranged around the primary side coil 21a and the secondary side coil 21b, a magnetic field may be generated so as to avoid the magnets, or the magnetic field trying to pass through the magnets may be lost. In addition, the magnetic permeability of the magnetic sheet 51 near the magnet is reduced. That is, the magnetic field is weakened by the magnet. Therefore, in order to minimize the magnetic field weakened by the magnet, measures such as separating the primary side coil 21a and the secondary side coil 21b from the magnet and providing the magnetic sheet 51 which is not easily affected by the magnet are provided. It is necessary to take.

  Here, since the primary-side non-contact charging module 41 is used for a fixed terminal as a transmission side for power supply, there is room in the occupied space in the fixed terminal of the primary-side non-contact charging module 41. Moreover, since the electric current which flows into the primary side coil 21a of the primary side non-contact charge module 41 is large, the insulation of the magnetic sheet 51 becomes important. This is because if the magnetic sheet 51 is conductive, a large current flowing through the primary side coil 21 a may be transmitted to other components via the magnetic sheet 51.

Considering the above points, the magnetic sheet 51 mounted on the primary-side non-contact charging module 41 has a thickness of 400 μm or more (preferably 600 μm to 1 mm), magnetic permeability of 250 or more, and magnetic flux saturation density of 350 mT. Ni-Zn ferrite sheets (insulating) having the above are preferable. However, by performing sufficient insulation treatment, a Mn—Zn ferrite sheet (conductive) can be used instead of the Ni—Zn ferrite sheet.

  In the primary-side non-contact charging module 41, the L value of the coil 21a of the primary-side non-contact charging module 41 varies greatly depending on whether or not the magnet 30a is used for alignment. That is, the magnetic flux between the primary side and the secondary side non-contact charging module is hindered by the presence of the same magnet in the magnet 30a or the secondary side non-contact charging module 42 in the primary side non-contact charging module 41, When there is a magnet, the L value of the coil 21a of the primary side non-contact charging module 41 is significantly reduced. In order to suppress the influence of the magnet 30a, the magnetic sheet 51 is preferably a high saturation magnetic flux density material (saturation magnetic flux density is 350 mT or more). Since the high saturation magnetic flux density material does not easily saturate the magnetic flux even if the magnetic field becomes strong, it is difficult to be affected by the magnet 30a, and the L value of the coil 21 when the magnet 30a is used can be improved. Therefore, the magnetic sheet 51 can be thinned.

  However, if the magnetic permeability of the magnetic sheet 51 becomes too low, the L value of the coil 21a is extremely lowered. As a result, the efficiency of the primary side non-contact charging module 41 may be reduced. Therefore, the magnetic permeability of the magnetic sheet 51 is at least 250 or more, preferably 1500 or more. In addition, the L value depends on the thickness of the magnetic sheet 51, but the thickness of the ferrite sheet 3 may be 400 μm or more. Note that the ferrite sheet can reduce the AC resistance of the coil 21 as compared to an amorphous metal magnetic sheet, but may be an amorphous metal. By using such a magnetic sheet 51, even if at least one of the primary-side non-contact charging module 41 and the secondary-side non-contact charging module 42 includes a magnet, the primary-side non-contact charging module 41 is a magnet. Can reduce the effect of.

  Further, since the ferrite sheet is Mn—Zn-based, it is possible to further reduce the thickness. 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.

  Next, the case where the secondary side non-contact charging module 42 is mounted on a portable terminal device will be described.

  FIG. 5 is a diagram showing the configuration of the mobile terminal device in the embodiment of the present invention, and is a perspective view when the mobile terminal device is disassembled.

  The portable terminal device 520 includes a liquid crystal panel 521, operation buttons 522, a substrate 523, a battery pack 524, and the like. A mobile terminal device 520 that receives power using electromagnetic induction is a mobile terminal device that includes a casing 525 that forms the exterior thereof and a secondary non-contact charging module 42 inside the casing 526.

  On the back surface of the housing 525 provided with the liquid crystal panel 521 and the operation button 522, information input from the operation button 522 is received and necessary information is displayed on the liquid crystal panel 521 to control the entire portable terminal device 520. A substrate 523 provided with a control unit is provided. A battery pack 524 is provided on the back surface of the substrate 523. The battery pack 524 is connected to the substrate 523 and supplies power to the substrate 523.

  Further, a secondary-side non-contact charging module 42 is provided on the back surface of the battery pack 524, that is, on the housing 526 side. The secondary side non-contact charging module 42 is supplied with electric power from the primary side non-contact charging module 41 by electromagnetic induction action, and charges the battery pack 524 using the electric power.

  The secondary side non-contact charging module 42 includes a secondary side coil 21b, a magnetic sheet 52, and the like. When the power supply direction is the case 526 side, the secondary coil 21b and the magnetic sheet 52 are arranged in this order from the case 526 side, so that the influence of the substrate 523 and the battery pack 524 is reduced and the power supply is received. Can do.

  Further, the secondary side non-contact charging module 42 may have a magnet 30 b used for alignment with the primary side non-contact charging module 41. In this case, it arrange | positions in the hollow part located in the center area | region of the secondary side coil 21b. This is determined by the standard (WPC) to be circular, the diameter is 15.5 mm or less, and the like. The magnet 30a has a coin shape and must be arranged so that the center thereof coincides with the winding center axis of the primary coil 21a. This is to reduce the influence of the magnet 30a on the primary coil 21a. The magnet 30b provided in the secondary side non-contact charging module 42 reduces the L value of both the primary side coil 21a and the secondary side coil 21b.

  When the secondary-side non-contact charging module 42 has the magnet 30b, the first method for arranging the magnet 30b is to arrange the magnet 30b on the upper surface of the central portion 32b of the magnetic sheet 52. Further, as a second method of arranging the magnet 30b, there is a method of arranging the magnet 30b instead of the central portion 32b of the magnetic sheet 52. In the second method, since the magnet 30b is disposed in the hollow region of the coil 21b, the secondary side non-contact charging module 42 can be reduced in size.

  In addition, when not using a magnet for position alignment of the primary side non-contact charge module 41 and the secondary side non-contact charge module 42, the magnet 30b is unnecessary.

  Next, the secondary side non-contact charging module 42 will be described.

  FIG. 6 is a diagram showing the secondary side non-contact charging module in the embodiment of the present invention, and shows a case where the secondary side coil is a circular coil.

  FIG. 7 is a detailed view showing the secondary side non-contact charging module in the embodiment of the present invention. Fig.7 (a) is a top view of a secondary side non-contact charge module, FIG.7 (b) is CC sectional drawing of the secondary side non-contact charge module in Fig.7 (a). FIG.7 (c) is DD sectional drawing of the secondary side non-contact charge module in Fig.7 (a) at the time of providing a linear recessed part. FIG.7 (d) is DD sectional drawing of the secondary side non-contact charge module in Fig.7 (a) at the time of providing a slit. 7A and 7B show a case where the magnet 30b is not provided. In addition, when provided, the magnet 30b shown with the dotted line is provided.

  6 to 7 illustrating the secondary side non-contact charging module 42 correspond to FIGS. 3 to 4 illustrating the primary side non-contact charging module 41, respectively. The configuration of the secondary side non-contact charging module 42 is substantially the same as that of the primary side non-contact charging module 41.

  The difference between the secondary side non-contact charging module 42 and the primary side non-contact charging module 41 is the size and material of the magnetic sheet 52. The magnetic sheet 52 used for the secondary-side non-contact charging module 42 has a size that fits within about 40 × 40 mm and has a thickness of about 2 mm or less.

  The sizes of the magnetic sheet 51 used for the primary side non-contact charging module 41 and the magnetic sheet 52 used for the secondary side non-contact charging module 42 are different. This is because the secondary side non-contact charging module 42 is generally mounted on a portable electronic device, and downsizing is required. In the present embodiment, the magnetic sheet 52 has a substantially square shape of about 33 mm × 33 mm. It is desirable that the magnetic sheet 52 be formed to be approximately the same or larger than the outer peripheral end of the coil 21b. Moreover, the shape of the magnetic sheet 51 may be a circle, a rectangle, a polygon, a rectangle having a large curve at each corner, or a polygon.

  Moreover, since the secondary side non-contact charging module 42 is used for a portable terminal as a receiving side of power supply, there is no room in the occupied space in the portable terminal of the secondary side non-contact charging module 42. Further, since the current flowing through the secondary side coil 21b of the secondary side non-contact charging module 42 is small, the insulating property of the magnetic sheet 52 is not so required. In the present embodiment, the secondary side coil 21b is constituted by a conductive wire of about 0.18 to 0.35 mm, and among these, the secondary side coil 21b of the secondary side non-contact charging module 42 has a value of 0. A conducting wire of about 18 to 0.30 mm is suitable.

  When the electronic device to be mounted is a mobile phone, the electronic device is often disposed between a case constituting the exterior of the mobile phone and a battery pack 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 52 between the aluminum that is the exterior of the battery pack and the secondary coil 21b disposed on the exterior to reduce the influence on the aluminum.

  In consideration of the above points, the magnetic sheet 52 used for the secondary side non-contact charging module 42 has a high magnetic permeability and saturation magnetic flux density, and can increase the L value of the secondary side coil 21b as much as possible. is important. Basically, any magnetic sheet having a magnetic permeability of 250 or more and a saturation magnetic flux density of 350 mT or more may be used similarly to the magnetic sheet 51. In the present embodiment, it is a sintered body of Mn—Zn-based ferrite, preferably having a magnetic permeability of 1500 or more, a saturation magnetic flux density of 400 or more, and a thickness of about 400 μm or more. However, Ni-Zn ferrite may be used, and power transmission with the primary side non-contact charging module 41 is possible if the magnetic permeability is 250 or more and the saturation magnetic flux density is 350 or more. Similarly to the primary coil 21a, the secondary coil 21b is wound in a substantially circular or rectangular shape. There are a case where positioning is performed by providing the magnet 30a in the primary side non-contact charging module 41 and a case where positioning is performed without the magnet 30a.

  Next, the relationship between the size of the magnet 30a and the size of the inner diameter of the primary coil 21a will be described. Here, although the case where the magnet 30a is arrange | positioned at the primary side non-contact charge module 41 is demonstrated, the same relationship is realized also when the magnet 30b is arrange | positioned at the secondary side non-contact charge module 42. FIG. In that case, the magnet 30b corresponds to the magnet 30a.

FIG. 8 is a diagram illustrating a relationship between a primary side non-contact charging module and a secondary side non-contact charging module including a magnet. FIG. 8A shows the case where the alignment magnet is used when the inner width of the coil is small, and FIG. 8B shows the case where the alignment magnet is used when the inner width of the coil is large. ) Is a case where the alignment magnet is not used when the inner width of the coil is small, and FIG. 8D is a case where the alignment magnet is not used when the inner width of the coil is large. In addition, in FIG. 8, the secondary side coil part 21b of the secondary side non-contact charge module 42 which performs electric power transmission with the primary side non-contact charge module 41 provided with the magnet 30a is demonstrated. However, the description of the secondary side coil portion 21b in relation to the secondary side non-contact charging module 42 described below is based on the secondary side non-contact charging module 42 including the magnet 30b and the primary side non-contact performing power transmission. This also applies to the secondary coil 2a of the charging module 42. That is, the planar coil part of the non-contact charging module that enables positioning and power transmission in both cases where the other non-contact charging module that is the partner of power transmission includes a magnet and does not include a magnet will be described. FIG. 9 is a diagram showing the relationship between the inner diameter of the coil and the L value of the coil.

  In the drawing, the magnet 30a is contained only in the through hole of the primary side coil 21a, but the same can be said even if it is contained in the through hole of the secondary side coil 21b.

  The primary side coil 21a and the secondary side coil 21b are opposed to each other. Of the coils 21a and 21b, magnetic fields are also generated in the inner portions 211 and 212, and power is transmitted. The inner portions 211 and 212 are opposed to each other. Further, the inner portions 211 and 212 are also portions close to the magnet 30a, and are easily affected by the magnet 30a. That is, when a magnetic flux is generated between the primary side coil and the secondary side coil for power transmission, if a magnet exists between and around the primary side coil and the secondary side coil, the magnetic flux extends to avoid the magnet. 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, the magnetic permeability of the magnetic sheet in the vicinity of the magnet is lowered. Therefore, the magnet 30a provided in the primary side non-contact charging module 41 weakens the magnetic fluxes of the inner side portions 211 and 212 of the primary side coil 2a and the secondary side coil 21b, and has an adverse effect. As a result, the transmission efficiency between the non-contact charging modules decreases. Therefore, in the case of FIG. 8A, the inner portions 211 and 212 that are easily affected by the magnet 30a are enlarged. On the other hand, in FIG. 8C in which no magnet is used, the L value increases because the number of turns of the secondary coil 21b is large. As a result, since the numerical value is greatly reduced from the L value in FIG. 8C to the L value in FIG. 8A, the case where the magnet 30a is provided for alignment in the coil with a small inner width is provided. As a result, the L value reduction rate becomes very large. If the inner width of the secondary coil 21b is smaller than the diameter of the magnet 30a as shown in FIG. 8A, the secondary coil 21b is directly affected by the magnet 30a by an area facing the magnet 30a. End up. Therefore, the inner width of the secondary coil 21b is preferably larger than the diameter of the magnet 30a.

On the other hand, when the inner width of the coil is large as shown in FIG. 8B, the inner portions 211 and 212 that are easily affected by the magnet 30a become very small. Further, in FIG. 8D in which no magnet is used, the number of turns of the secondary coil 21b is reduced, so that the L value is smaller than that in FIG. 8C. As a result, since the decrease in the numerical value is small from the L value in FIG. 8D to the L value in FIG. 8B, the L value decrease rate can be kept small in a coil having a large inner width. Moreover, since the edge part of the hollow part of the coil 21 leaves | separates from the magnet 30a, so that the inner width of the secondary side coil 21b is large, the influence of the magnet 30a can be suppressed. However, since the non-contact charging module is mounted on a charger or an electronic device, it cannot be formed in a size larger than a certain size. Therefore, if the inner width of the coils 21a and 21b is increased to reduce the adverse effect from the magnet 30a, the number of turns decreases, and the L value itself decreases regardless of the presence or absence of the magnet. When the magnet 30a is circular, it is as follows. That is, when the outer diameter of the magnet 30a and the inner width of the coil 21 are substantially the same (the outer diameter of the magnet 30a is about 0 to 2 mm smaller than the inner width of the coil 21), the magnet 30a should be maximized. Therefore, the alignment accuracy of the primary side non-contact charging module and the secondary side non-contact charging module can be improved. Further, since the inner diameter of the coil 21 can be minimized, the number of turns of the coil 21 can be increased and the L value can be improved. In addition, when the outer diameter of the magnet 30a is smaller than the inner diameter of the coil 21 (the outer diameter of the magnet 30a is smaller by about 2 to 8 mm than the inner width of the coil 21), the inner portion 211 can be used even if the alignment accuracy varies. , 212 can be prevented from being present between the portions facing each other. At this time, since the outer diameter of the magnet 30a is 70% to 95% of the inner width of the coil 21, it is possible to sufficiently cope with variations in alignment accuracy, and further, the primary side non-contact charging module and the secondary side non-contact The accuracy of alignment with the contact charging module can be improved. Further, the number of turns of the coil 21 can be ensured. This means that on the plane parallel to the planar coil portion 2, the area of the magnet 30a is 70% to 95% of the area of the through hole at the center of the planar coil portion 2. By configuring in this way, the non-contact charging module depending on the presence / absence of a magnet, whether or not the other non-contact charging module that is the partner of power transmission is provided with a magnet for alignment The fluctuation of the L value of the inner planar coil is reduced, and alignment and power transmission can be performed. That is, whether the primary side non-contact charging module 41 is provided with the magnet 30a or not, the secondary side non-contact charging module 41 is the primary side non-contact charging module 41 in both cases. And power transmission can be made efficient. Even if the secondary side non-contact charging module 42 is provided with the magnet 30b or not, the primary side non-contact charging module 42 is the secondary side non-contact charging module 42 in either case. And power transmission can be made efficient. In the primary side non-contact charging module 41, the primary side coil 21a forms an LC resonance circuit using a resonance capacitor. At this time, if the L value changes significantly depending on whether the magnet is used for alignment or not, the resonance frequency with the resonance capacitor also changes significantly. Since this resonance frequency is used for power transmission between the primary side non-contact charging module 41 and the secondary side non-contact charging module 42, if the resonance frequency changes greatly depending on the presence or absence of a magnet, power transmission cannot be performed correctly. However, with the above configuration, power transmission is highly efficient.

  Furthermore, as shown in FIG. 9, when the size of the magnet 30a and the outer diameter of the secondary coil 21b are constant, the number of turns of the secondary coil 21b is reduced to increase the inner diameter of the secondary coil 21b. As a result, the influence of the magnet 30a on the secondary coil 21b becomes smaller. That is, the L value of the secondary coil 21b is close to when the magnet 30a is used for positioning the primary side non-contact charging module 41 and the secondary side non-contact charging module 42 and when it is not used. Therefore, the resonance frequency when using the magnet 30a and when not using it is very close. At this time, the outer diameter of the coil is unified to 30 mm. Also, when the distance between the hollow end portion of the primary coil 21a and the outer end portion of the magnet 30a is larger than 0 mm and smaller than 6 mm, the L value is set to 15 μH or more and the magnet 30a is used. The L value when not used can be made closer. The result of FIG. 9 is the same as the L value of the primary side coil 21a of the primary side non-contact charging module 41 when the secondary side non-contact charging module 42 includes the magnet 30b.

  FIG. 10 is a schematic diagram showing a positional relationship between magnets provided in the non-contact charging module and the other non-contact charging module that performs power transmission in the embodiment of the present invention. It has a magnet used for alignment of a secondary side non-contact charge module and a secondary side non-contact charge module. FIG. 10A shows a case where the secondary coil is a rectangular coil, and FIG. 10B shows a case where the secondary coil is a circular coil.

At this time, the relationship between the magnet and the non-contact charging module is the relationship between the primary side non-contact charging module 41 and the magnet 30b provided on the secondary side non-contact charging module 42, and the secondary side non-contact charging module 42. And the relationship with the magnet 30a provided in the primary side non-contact charging module 41 is true in both relations. Therefore, although the relationship between the secondary side non-contact charging module 42 and the magnet 30a provided in the primary side non-contact charging module 41 will be described as an example, the primary side non-contact charging module 41 and the secondary side non-contact charging are described. This also applies to the relationship with the magnet 30b provided in the module 42. That is, the influence of the magnet provided in the other non-contact charging module that is the partner of power transmission is suppressed, even if the other non-contact charging module is provided with a magnet,
A contactless charging module capable of alignment and power transmission will be described.

  The secondary coil 2c shown in FIG. 10 (a) and the secondary coil 21b shown in FIG. 10 (b) are aligned so that the center thereof matches the center of the alignment magnet 30a. Even if the primary side non-contact charging module does not include the magnet 30a, the secondary side non-contact charging module 42 may include a magnet.

  The alignment magnet 30a is circular with a diameter m, and the magnetic sheet 52 is square. The magnetic sheet 52 may be a polygon other than a square, a rectangle, or a curve at a corner (corner), but a square is more preferable for miniaturization while ensuring the performance of the primary side non-contact charging module 41. preferable.

  The positioning magnet 30a has been proposed as a standard for using the non-contact charging modules 41 and 42, in order to ensure power transmission between the non-contact charging modules 41 and 42 and to center the transmitting and receiving coils. used.

  When the rectangular secondary coil 2c or the circular secondary coil 21b having the same number of windings is installed on the magnetic sheet 52 of the same size, both are accommodated in the magnetic sheet 52 having the same area. That is, as shown in FIGS. 10A and 10B, when the rectangular secondary coil 2c or the circular secondary coil 21b having the same number of windings is installed on the magnetic sheet 52 of one side length The shortest distance y1 between the opposing inner sides of the rectangular secondary coil 2c and the inner diameter y2 of the circular secondary coil 21b can be made the same length.

  On the other hand, the diagonal length x inside the rectangular secondary coil 2c is longer than the shortest distance y1 between the opposing inner sides of the rectangular secondary coil 21b having the same length as the inner diameter y2 of the circular secondary coil 21b. x. That is, the rectangular secondary coil 2c has a larger area in which the gap between the alignment magnet 30a and the secondary coil 2c can be larger than that of the circular secondary coil 21b. That is, the relationship is x> y1, y1 = y2.

  In order to suppress the influence of the magnet provided in the primary side non-contact charging module 41 or the secondary side non-contact charging module 42, the rectangular coil needs to satisfy x> = m, preferably y1> = m. .

  When the distance between the secondary coil 21b or 2c and the alignment magnet 30a is increased, the influence of the alignment magnet 30a is reduced, and the L value reduction rate of the secondary coil 21b or 2c can be reduced. When the secondary coil is rectangular, when the diagonal dimension x inside the secondary coil 2c is the same value as the inner diameter y2 of the circular secondary coil 21b, the L value reduction rate of the secondary coil 2c is 2. The value is substantially the same as that of the secondary coil 21b.

  Therefore, when the space for storing the primary-side non-contact charging module 41 of the non-contact charger 400 is square and the space is limited, the secondary coil 20c is formed with the magnetic sheet 52 as a square. Is preferably formed in a rectangular shape. Thereby, compared with a circular coil, the rectangular secondary side coil 2c can be kept away from the magnet 30a, and the rectangular secondary side coil 2c is hardly affected by the magnet 30a. Moreover, although the magnetic flux concentrates on the corner part of the rectangular secondary side coil 2c, since the distance between the corner part and the magnet 30a can be ensured, the influence of the magnet 30a can be reduced.

That is, when the secondary coil 21b is wound in a circular shape, the entire secondary coil 21b exhibits substantially the same magnetic field strength. However, when the secondary coil 21b is wound in a substantially rectangular shape, the magnetic field concentrates at the corner. Therefore, the diagonal dimension x on the inner side of the secondary coil 2c is positioned outside the outer diameter of the alignment magnet 30a (x> = m), so that power can be transmitted while suppressing the influence of the magnet 30a. Further, since the shortest distance y1 between the inner sides facing the secondary coil 21b is located outside the outer diameter of the alignment magnet 30a (y1> = m), the entire secondary coil 2c is aligned with the alignment magnet. It is located outside the outer diameter of 30a, and the corner (corner) of the secondary coil 21b is located at a certain distance from the magnet 30a. Therefore, the influence which the magnet 30a has on the secondary side coil 21b can be reduced more.

  In the present embodiment, the diagonal dimension (x) of the rectangular secondary coil 2c is set to approximately 23 mm and the diameter (m) of the alignment magnet 30a is set to 15.5 mmφ so as to satisfy the above-described relationship. did. The alignment magnet 30a is generally configured to have a maximum diameter of 15.5 mm and smaller. Considering miniaturization and positioning accuracy, the magnet 30a has a diameter of about 10 mm to 15.5 mm and a thickness of about 1.5 to 2 mm, so that positioning can be performed in a balanced manner. It is. Further, a neodymium magnet is used, and the strength may be about 75 mT to 150 mT. In the present embodiment, since the interval between the coil of the primary side non-contact charging module and the coil of the secondary side non-contact charging module is about 2 to 5 mm, it is possible to sufficiently align with such a magnet. . Therefore, if the secondary coil 2c is wound in a circular shape, the diameter of the hollow portion is 15.5 mm or more, and if it is wound in a rectangular shape, the diagonal of the hollow portion is 15.5 mm or more, preferably the hollow portion By setting the side width to 15.5 mm or more, basically, the influence of the magnet 30a can be reduced regardless of the size of the magnet 30a provided on the counterpart side.

  As described above, the rectangular coil is less susceptible to the influence of the magnet than the circular coil, but if both the secondary coil 21b and the secondary coil 21b described later are rectangular coils, alignment during charging is performed. Sometimes you have to align each other's corners. Therefore, since it is difficult to align the angle at the time of alignment, it is preferable that one is a circular coil and the other is a rectangular coil. That is, the angle adjustment is not necessary, and the rectangular coil can further suppress the influence of the magnet. Note that either the primary side non-contact charging module 41 or the secondary side non-contact charging module 42 may include a rectangular coil, and any of them may include a circular coil. Since efficient power transmission is possible regardless of the shape, the primary-side non-contact charging module 41 may be provided with a circular coil.

  In addition, compared with a circular coil, a rectangular coil is a coil whose corner R (the radius of the curve at the four corners) of the hollow part is 30% or less of the side width of the hollow part (y1 in FIG. 10 (a)). Say. That is, in FIG. 10A, the substantially rectangular 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 rectangular coil cannot be obtained. As a result of the study, it was found that when the side width y1 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 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 substantially rectangular hollow portion. it can.

  Next, the thickness of the central part of the magnetic sheets 51 and 52 will be described.

FIG. 11 is a conceptual diagram of the magnetic sheet of the non-contact charging module according to the embodiment of the present invention. As an example, the magnetic sheet 51 provided in the secondary-side non-contact charging module 42 is used. FIG. 11A is a top view of the magnetic sheet of the contactless charging module according to the embodiment of the present invention, and FIG. 11B is a top view in which the position of the linear recess of the magnetic sheet in FIG. 11A is changed. It is. 11C is a cross-sectional view taken along the line E-E in FIG. 11A, FIG. 11C is a cross-sectional view taken along the line F-F in FIG. It is FF sectional drawing of Fig.11 (a) at the time of setting a center part as a through-hole. The central portion 32b is a concave shape or a through hole. For example, the central portion 32b is convex so that the magnetic flux density of the secondary coil 21b is improved, and the transmission efficiency of the secondary non-contact charging module 42 is improved.

  However, the influence of the magnet 30a provided in the primary side non-contact charging module 41 can be reduced by providing a hole portion in which the central portion 32b has a concave shape or a through hole. The reason will be described below.

  In addition, in FIG. 11, the magnetic sheet 52 of the primary side non-contact charge module 41 provided with the magnet 30a and the secondary side non-contact charge module 42 which performs electric power transmission is demonstrated as an example. However, the description of the magnetic sheet 52 of the secondary side non-contact charging module 42 described below is based on the magnetic property of the primary side non-contact charging module 41 that performs power transmission with the secondary side non-contact charging module 42 including the magnet 30b. The same applies to the sheet 51. That is, the center part of the magnetic sheet of the non-contact charging module that enables alignment and power transmission in both the case where the other non-contact charging module which is the partner of power transmission is provided with a magnet and the case where it is not provided will be described. .

  As described above, the contactless power transmission device may or may not use a magnet for positioning the primary side contactless charging module 41 and the secondary side contactless charging module 42. And since the magnet will interfere with the magnetic flux between the primary side and secondary side non-contact charging module, when there is a magnet, the primary side coil 21a of the primary side non-contact charging module 41 and The L value of the secondary side coil 21b of the secondary side non-contact charging module 42 is significantly reduced.

  Further, the primary side coil 21a forms an LC resonance circuit in the primary side non-contact charging module 41 using a resonance capacitor. At this time, if the L value changes significantly depending on whether or not the magnet 30a is used for alignment, the resonance frequency with the resonance capacitor also changes significantly. Since this resonance frequency is used for power transmission between the primary side non-contact charging module 41 and the secondary side non-contact charging module 42, if the resonance frequency changes greatly depending on the presence or absence of the magnet 30a, power transmission cannot be performed correctly. End up.

  Therefore, in order to make the resonance frequency between when the magnet 30a is used for alignment and when not used, the L value of the secondary coil 21b when the magnet 30a is used for alignment and when not used. Must be close to each other.

  Next, the relationship between the thickness of the central portion of the magnetic sheet 52 and the L value of the secondary coil 21b in the case where the primary side non-contact charging module is provided with the magnet 30a and the case where the magnet 30a is not provided will be described.

  FIG. 12 is a diagram showing the relationship between the L value of the coil of the non-contact charging module and the thickness of the central portion when the magnet is not provided for alignment in the other non-contact charging module of the present embodiment. The degree of hollowing out indicates that 0% is a flat view without the central portion 32b having a concave shape, and 100% indicates that the central portion 32b is a through hole.

In the case where the magnet 30a is not used, the magnetic field of the secondary coil 21b becomes smaller and the L value decreases as the central portion 32b of the magnetic sheet 52 becomes thinner. On the other hand, in the case of using the magnet 30a, the thinner the central portion 32b of the magnetic sheet 52 is, the larger the distance in the stacking direction between the magnetic sheet 52 and the magnet 30a is, so the influence of the magnet 30a is reduced. The magnetic field of the secondary coil 21b increases and the L value increases. And when the center part 32b is formed in the through hole, the L value is closest. That is, by using the central portion 32b as a through hole, the influence of the magnet 30a used for alignment can be minimized.

  Further, since the magnet 30a is aligned by being attracted to the magnetic sheet 52, the alignment accuracy is improved when the central portion 32b has a certain thickness. In particular, the alignment accuracy can be stabilized by setting the degree of hollowing to 60% or less.

  Therefore, by setting the degree of hollowing to 40 to 60%, the L value of the secondary coil 21b when the magnet 30a is used for alignment and when it is not used is made close to the value, and at the same time the alignment of the magnet 30a is adjusted. The effect of can be sufficiently obtained. That is, the magnet 30a and the central portion 32b of the magnetic sheet 52 are attracted so that the centers of each other can be aligned.

  In this embodiment, it is about 50%, and both effects can be obtained most effectively. Further, to leave about half the thickness, after the through hole is formed, the through hole may be filled with a magnetic material to a half depth. Moreover, the hole (recessed part or through-hole) provided in the center part 32b does not necessarily have the same shape and the same size as the center part 32a. Even if the shape of the central portion 32b, that is, the hollow portion of the coil is substantially rectangular or substantially circular, the hole portion may have various shapes regardless of the shape. That is, the shape is rectangular or circular. Moreover, it is preferable that a hole part is smaller than the center part 32b, and it is good to ensure the area of 30% or more of the area of the center part 32b at least.

  Further, since the magnetic sheets 51 and 52 may be laminated with a high saturation magnetic flux density material and a high magnetic permeability material, for example, the central portion of the high saturation magnetic flux density material is formed flat and penetrates through the central portion of the high magnetic permeability material. The central portion 32a may be formed in a concave shape as the magnetic sheets 51 and 52 by forming in a hole. The high saturation magnetic flux density material refers to a magnetic sheet having a high saturation magnetic flux density and a low magnetic permeability as compared with a high magnetic permeability material, and particularly preferably a ferrite sheet.

  The diameter of the recess or the through hole is preferably smaller than the inner diameter of the secondary coil 21b. By setting the diameter of the recess or the through hole to be substantially the same as the inner diameter of the secondary coil 21b (0 to 2 mm smaller than the inner diameter of the coil), the magnetic field in the inner circumference of the secondary coil 21b can be increased. .

  Further, by making the diameter of the recess or the through hole smaller than the inner diameter of the coil (2 to 8 mm smaller than the inner diameter of the coil), the outer side of the step can be used for alignment, This can be used to make the L value of the primary coil 21a close to when the magnet 30a is used for alignment and when it is not used. Moreover, it is good for a recessed part or a through-hole to be larger than the size of the magnet 30a. In other words, it is preferable that the hole is larger than the diameter of the magnet 30a and smaller than the hollow portion of the secondary coil 21b.

  Furthermore, since the shape of the upper surface of the recess or the through hole is the same as the shape of the hollow portion of the secondary coil 21b, the magnet 30a and the center portion 32b of the magnetic sheet 52 attract each other in a balanced manner, and the positions of the centers of each other Matching can be done with high accuracy.

  Since all the end portions of the recesses or the through holes are equidistant from the inner diameter of the secondary coil 21b, the magnet 30a and the center portion 32b of the magnetic sheet 52 are attracted in a balanced manner, and the alignment between the centers of each other is further increased. Can be accurate.

  Furthermore, since the center of the shape of the upper surface of the recess or the through hole coincides with the center of the hollow portion of the secondary coil 21b, the magnet 30a and the center portion 32b of the magnetic sheet 52 attract each other in a balanced manner. The center can be accurately aligned. Moreover, since the recess or the through hole is formed larger than the magnet 30a, the influence of the magnet 30a can be suppressed in a well-balanced manner.

  As described above, the configuration in which the central portion is a hole is applied to both the primary-side non-contact charging and the magnetic sheet 51 of the joule, and the effect is applied to the central portion 32a of the magnetic sheet 51 of the primary-side non-contact charging module 41. It can also be obtained with a hole. That is, the primary-side non-contact charging module 41 can perform alignment and efficient power transmission regardless of whether the secondary-side non-contact charging module 42 includes the magnet 30b or not. be able to.

  Moreover, you may form a thick part in the area | region where the coils 21a and 21b on the flat parts 31a and 31b are not arrange | positioned at the four corners of the magnetic sheets 51 and 52. That is, nothing is placed on the magnetic sheets 51 and 52 at the four corners of the magnetic sheets 51 and 52 and outside the outer circumferences of the coils 21a and 21b on the flat portions 31a and 31b. Therefore, the thickness of the magnetic sheets 51 and 52 can be increased by forming the thick portion there, and the power transmission efficiency of the non-contact power transmission device can be improved. The thicker the thicker the better, but it is almost the same as the thickness of the conductor for thinning.

  According to the mobile terminal of the present invention, the mobile terminal can be used regardless of whether the magnet is used or not used for positioning the primary side non-contact charging module and the secondary side non-contact charging module. Because it suppresses the change in the L value of the coil provided in the secondary non-contact charging module provided, it can be used with or without a magnet. It is useful as a portable terminal such as a computer, a portable device such as a digital camera and a video camera.

DESCRIPTION OF SYMBOLS 1 Non-contact charge module 2 Planar coil part 21 Coil 21a Primary side coil 21b Secondary side coil 211, 212 Inner part 22a, 23a Terminal (primary side)
22b, 23b terminal (secondary side)
30a Magnet (primary side)
30b Magnet (secondary side)
31a Flat part (primary side)
31b Flat part (secondary side)
32a Center (primary side)
32b Center part (secondary side)
33a Straight recess (primary side)
33b Straight recess (secondary side)
34a Slit (primary side)
34b Slit (secondary side)
41 Primary side non-contact charging module (transmission side non-contact charging module)
42 Secondary side non-contact charging module (receiving side non-contact charging module)
51 Magnetic sheet (primary side)
52 Magnetic sheet (secondary side)
DESCRIPTION OF SYMBOLS 71 Power input part 72 Rectifier circuit 82 Power output part 200 Electronic device 300 Commercial power supply 301 Outlet 400 Non-contact charger 401 Plug 402 Surface 501 Desktop 520 Portable terminal 521 Liquid crystal panel 522 Operation button 523 Board | substrate 524 Battery pack (electric power holding part)
525, 526 housing

Claims (4)

A portable terminal comprising a reception-side planar coil portion that receives power by electromagnetic induction from a non-contact charger comprising a transmission-side planar coil portion,
The receiving-side planar coil part does not include a magnet in its own hollow part, and the magnet provided in the hollow part of the transmitting-side planar coil part is aligned with the transmitting-side planar coil part of the non-contact charger. There are a case where alignment is performed using a case and a case where alignment is performed without using the magnet.
The receiving-side planar coil portion around which a conducting wire is wound;
A magnetic sheet for placing the coil surface of the receiving-side planar coil portion;
A housing on which a display unit is disposed and the receiving-side planar coil unit and the magnetic sheet are accommodated ,
From the back side of the housing, the receiving side planar coil portion and the magnetic sheet are arranged in order,
A portable terminal, wherein a hollow portion of the reception-side planar coil portion is larger than a magnet provided in a transmission- side contactless charging module. 2. The mobile terminal according to claim 1, wherein a distance between an end of the hollow portion of the reception-side planar coil portion and the magnet is greater than 0 mm and less than 6 mm. Said receiving-side planar coil portion, in a plane parallel to the receiving-side planar coil portion, the area of the magnet, which is configured to be 70% to 95% of the area of the hollow portion of said receiving-side planar coil section The mobile terminal according to claim 1 , wherein the mobile terminal is a mobile terminal. The mobile terminal according to any one of claims 1 to 3, wherein an area of the receiving side planar coil portion is larger than a circle having a diameter of 15.5 mm.

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