JP4835801B1 - Non-contact charging module and non-contact charging device - Google Patents

Abstract

Provided are a non-contact charging module and a non-contact charging device capable of minimizing a decrease in the strength of a conductor while achieving a reduction in thickness of the non-contact charging module in a state in which coil terminals are brought close to each other. With the goal.
A circular planar coil portion in which a conductive wire is wound in a spiral shape, a rectangular magnetic sheet provided so as to face the planar coil portion, a center of the magnetic sheet provided on the magnetic sheet, A slit extending in a substantially diagonal direction of the magnetic sheet from a portion, and one of the conductive wires drawn out from the planar coil portion extends in parallel to one side of the magnetic sheet in a tangential direction of the outer periphery of the planar coil portion, The other of the conducting wires drawn out from the planar coil part is drawn out through the slit.
[Selection] Figure 3

Description

  The present invention relates to a non-contact charging module and a non-contact charging device having a planar coil portion made of a spiral copper wire and a magnetic sheet.

  In recent years, many devices that can charge the main device in a non-contact manner with a charger have been used. In this method, a power transmission coil is arranged on the charger side, a power reception coil is arranged on the main device side, and electromagnetic induction is generated between the two coils to transmit power from the charger side to the main device side. 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 power transmission coil or a power reception coil and a magnetic sheet as in (Patent Document 1). In a non-contact charging module including a planar coil portion of one conductive wire and a magnetic sheet having a planar surface as in (Patent Document 1), the winding start or winding end of the coil is located inside the coil. The coil winding start or winding end needs to be extended to the end of the magnetic sheet to form a terminal, but the two terminals can be easily mounted by bringing them as close as possible. Therefore, in (Patent Document 1), the winding start and winding end of the coil are bent at about 90 degrees and extended as a coil terminal.

JP 2006-42519 A

  However, when the coil winding start and winding end are folded at about 90 degrees as in the coil of Patent Document 1, the strength of the conductive wire at two portions, that is, the folding portion on the winding start side and the folding portion on the winding end side of the coil. Has been lowered. Moreover, since the winding start or winding end of the coil overlaps with the coil being wound in the thickness direction, the non-contact charging module is prevented from being thinned.

  It has also been proposed that a circular magnet be used to align the center of the planar coil portion. In order to suppress the influence of the magnetic field of the circular magnet, it is necessary to increase the coil inner circumference of the planar coil portion. If it does so, it is necessary to bend and draw | extract the conducting wire withdraw | derived from the inner periphery of a planar coil part considerably large.

  Therefore, in view of the above problems, the present invention minimizes the decrease in the strength of the lead wire by reducing the bending of the lead wire while reducing the thickness of the non-contact charging module with the coil terminals close to each other. An object of the present invention is to provide a non-contact charging module that can be used.

In order to solve the above problems, the present invention provides a circular planar coil portion in which a conducting wire is wound in a spiral shape, a rectangular magnetic sheet provided so as to face the planar coil portion, and the magnetic sheet. A slit located on a line extending from a central portion of the magnetic sheet to a diagonal portion of the magnetic sheet, wherein one of the conductive wires drawn out from the planar coil portion is a tangent to the outer periphery of the planar coil portion Extending in parallel to one side of the magnetic sheet in a direction, drawn from the magnetic sheet from the diagonal portion of the magnetic sheet, and the other of the conducting wires drawn from the planar coil portion is passed through the slit One of the conductive wires drawn out from the diagonal portion of the magnetic sheet and drawn out from the diagonal portion of the magnetic sheet is close to and parallel to each other.

  According to the present invention, there is provided a non-contact charging module and a non-contact charging device capable of minimizing a decrease in the strength of a conductive wire while achieving a reduction in thickness of the non-contact charging module in a state where the coil terminals are close to each other. Can be provided.

Assembly drawing of the non-contact charging module in the embodiment of the present invention The conceptual diagram of the non-contact charge module in embodiment of this invention The conceptual diagram of the magnetic sheet of the non-contact charge module in embodiment of this invention

The invention described in claim 1 is provided in the circular planar coil portion in which the conducting wire is wound in a spiral shape, the rectangular magnetic sheet provided so as to face the planar coil portion, and the magnetic sheet, A slit positioned on a line extending from the central portion of the magnetic sheet to the diagonal portion of the magnetic sheet , and one of the conductive wires drawn out from the planar coil portion is in a tangential direction of the outer periphery of the planar coil portion The magnetic sheet extends in parallel with one side of the magnetic sheet, is drawn from the magnetic sheet from the diagonal portion of the magnetic sheet, and the other of the conductive wires drawn from the planar coil portion passes through the slit. One of the conducting wires drawn out from the diagonal portion of the magnetic sheet and drawn out from the diagonal portion of the magnetic sheet is close to and parallel to each other. Thereby, it is possible to minimize the reduction in the strength of the conductive wire while achieving a reduction in the thickness of the non-contact charging module in a state where the terminals of the coil are brought close to each other.

The invention according to claim 2 is characterized in that the slit extends from the diagonal portion from which one of the conducting wires is drawn toward the central portion , and the coil terminals are brought close to each other. Thus, a reduction in the strength of the conductive wire can be minimized while achieving a reduction in the thickness of the contactless charging module.

  The invention according to claim 3 is characterized in that the other of the conducting wires drawn out from the planar coil portion is bent at an angle of 50 degrees to 80 degrees in a direction away from the center of the planar coil portion, and 2. The contactless charging module according to claim 1, further comprising a second bent portion bent at an angle of 30 degrees to 70 degrees in the same bending direction as the first bent portion after passing through the slit. Thus, it is possible to minimize the reduction in the strength of the conductive wire while achieving a reduction in the thickness of the contactless charging module with the coil terminals close to each other.

The invention according to claim 4 is characterized in that the diagonal portion of the magnetic sheet is curved , and the corner portion of the magnetic sheet is curved with an R so that the size of R is adjusted. By doing so, the space | interval of the two conducting wires pulled out from the plane coil part can be adjusted, and the assembly of a non-contact charge module can be made easy.

  The invention according to claim 5 uses the planar coil portion provided in the non-contact charging module according to any one of claims 1 to 5 for at least one of a power transmission coil or a power reception coil. In the non-contact charging device characterized by the above, it is possible to minimize the decrease in the strength of the conducting wire while achieving a reduction in the thickness of the non-contact charging module in a state where the terminals of the coil are brought close to each other.

(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an assembly diagram of a contactless charging module according to an embodiment of the present invention. 2A and 2B are conceptual diagrams of the contactless charging module according to the embodiment of the present invention, in which FIG. 2A is a top view, and FIGS. 2B and 2C are side views as viewed from the direction A in FIG. is there. FIG. 3 is a conceptual diagram of the magnetic sheet of the non-contact charging module in the embodiment of the present invention.

  The non-contact charging module 1 of the present invention includes a circular planar coil portion 2 in which a conducting wire is wound in a spiral shape, and a magnetic sheet 3 provided so as to face the surface of the coil 21 of the planar coil portion 2. .

  As shown in FIG. 1, the planar coil portion 2 includes a coil 21 in which a conductor is wound in a radial direction so as to draw a vortex on the surface, and terminals 22 and 23 provided at both ends of the coil 21. The coil 21 is obtained by winding a conducting wire on a plane, and a surface formed by the coil is called a coil surface. In addition, the thickness direction is a stacking direction of the planar coil portion 2 and the magnetic sheet 3. In the present embodiment, the coil 21 is wound outward from an inner diameter of 20 mm in diameter, and the outer diameter is 30 mm. That is, the coil 21 is wound in a donut shape. The coil 21 may be wound in a circular shape. 1, 2, and 3, the coil 21 of the planar coil portion 2 shows only the innermost and outermost conductors, but the conductor of the coil 21 is wound between them. .

  Further, as shown in FIG. 2, in the present embodiment, the cross section of the conducting wire of the coil 21 is circular, but it may be rectangular. However, in the case of a circular conductor compared to a conductor having a rectangular cross section, a gap is generated between adjacent conductors, so that the stray capacitance between the conductors is reduced, and the AC resistance of the coil 21 can be kept small. .

  In addition, the coil 21 is wound in one stage rather than being wound in two stages in the thickness direction, so that the alternating current resistance of the coil 21 is lowered and 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 21 in two stages. By winding in one stage, the contactless charging module 1 can be thinned.

  Moreover, the loss in the coil 21 is prevented because the alternating current resistance of the coil 21 is low, and the power transmission efficiency of the contactless charging module 1 that depends on the L value is improved by improving the L value that is the inductance value of the coil 21. be able to.

  In the present embodiment, the inner diameter of the coil 21 shown in FIG. 2 is 10 mm to 20 mm, and the outer diameter is about 30 mm. As the inner diameter is smaller, the number of turns of the coil 21 can be increased in the contactless charging module 1 of the same size, and the L value can be improved.

  If the terminals 22 and 23 are arranged close to each other, they are easy to handle when attaching the terminals to the connector or when performing wiring processing to the subsequent stage (details will be described later).

  The magnetic sheet 3 is provided in order to improve the power transmission efficiency of non-contact charging using electromagnetic induction action and reduce magnetic flux leakage to the back surface of the magnetic sheet 3, as shown in FIG. The flat part 31 and the recessed part 33 are provided. In addition, as shown in FIG. 2, the recessed part 33 (FIG.2 (b)) may be the slit 34 (FIG.2 (c)). Further, the central portion of the coil 21 is not necessarily limited to a flat portion, and may be a convex shape. That is, as shown in FIGS. 2B and 2C, by providing the concave portion 33 or the slit 34, the conductive wire from the winding end of the coil 21 to the terminal 23 can be accommodated in the concave portion 33 or the slit 34. Therefore, it can be made thinner. In the present embodiment, the recess 33 or the slit 34 is formed to extend diagonally from the center of the magnetic sheet 3. By forming the recess 33 or the slit 34 in this way, the terminals 22 and 23 can be formed with a smaller angle for bending the conducting wire. In this case, the length of the recess 33 or the slit 34 is about 15 to 20 mm. However, the length of the recess 33 or the slit 34 depends on the inner diameter of the coil 21. Further, the width and depth of the recess 33 or the slit 34 depend on the wire diameter and the number of steps of the conductive wire of the coil 21. The width of the recess 33 or the slit 34 is about three times the wire diameter of the conducting wire of the coil 21, and the depth of the recess 33 or the slit 34 is somewhat larger than the wire diameter of the conducting wire of the coil 21 in the case of one-stage winding.

  Further, the corners of the magnetic sheet 3 are curved with an R. By adjusting the size of R, the distance between the two conductors 42 and 43 can be adjusted when the two conductors 42 and 43 are brought close to each other by being drawn from the planar coil portion 2. The degree of freedom of arrangement increases, and the assembly of the non-contact charging module can be facilitated. Furthermore, by attaching R to the diagonal part of the magnetic sheet 3, it is possible to prevent the magnetic sheet 3 from increasing in size and to reduce the size of the contactless charging module 1.

  In addition, if it is the recessed part 33, since a through-hole and a slit are not provided in the magnetic sheet 3, it can prevent that a magnetic flux leaks and can improve the electric power transmission efficiency of the non-contact charge module 1. FIG. Moreover, when it is the recessed part 33, as shown in FIG.2 (b), it is not limited to the recessed part 33 whose cross-sectional shape becomes a square shape, You may round and round.

  Further, it is desirable that the coil 21 has a one-stage structure as described above. In this case, all the turns in the radial direction of the coil 21 are made into a one-stage structure, or one part is made into a one-stage structure and other parts are made. A two-stage structure can be considered. Therefore, one of the terminals 22 and 23 can be pulled out from the outer periphery of the coil 21, but the other must be pulled out from the inside. Accordingly, the portion around which the coil 21 is wound and the foot portion 24 always overlap in the thickness direction. Accordingly, the concave portion 33 or the slit 34 may be provided in the overlapping portion, and the foot portion may be accommodated therein. In addition, a leg part means the part from the winding end of the coil 21 to the terminal 22.

  In the present embodiment, a Ni—Zn ferrite sheet, a Mn—Zn ferrite sheet, a Mg—Zn ferrite sheet, or the like can be used as the magnetic sheet 3. The ferrite sheet can reduce the AC resistance of the coil 21 as compared with the amorphous metal magnetic sheet.

  The magnetic sheet 3 has a size of about 33 mm × 33 mm, and at least a high saturation magnetic flux density material 3a and a high magnetic permeability material 3b are laminated. The thickness of the magnetic sheet 3 is 0.6 mm, the thickness of the high saturation magnetic flux density material 3a is 0.45 mm, and the thickness of the high permeability material 3b is 0.15 mm. Even when the high saturation magnetic flux density material 3a and the high magnetic permeability material 3b are not laminated, it is preferable to use the high saturation magnetic flux density material 3a having a saturation magnetic flux density of 350 mT or more and a thickness of at least 300 μm.

  With reference to FIG. 3, the lead wire drawing shape of the coil 21 and the groove shape of the recess 33 or the slit 34 formed in the magnetic sheet 3 will be described in detail. In addition, although it carries out by the shape of a recessed part (FIG.2 (b)) after that as a representative, the same structure can be taken also with the shape of a slit (FIG.2 (c)), and the same effect can be acquired.

  As shown in FIG. 3, the recess 33 is formed to extend diagonally from the center on the rectangular magnetic sheet 3. That is, the magnetic sheet 3 is provided with a groove of the concave portion 33 at an angle of approximately 45 degrees on the edge of the magnetic sheet 3. By doing this, the lead wire 42 led out from the coil 21 at the point P is led to the recess 33 only by bending the lead wire 42 away from the center of the coil 21 at an angle of less than 90 degrees (θ1 in FIG. 3). be able to. Therefore, it is possible to prevent a decrease in strength of the lead conductor 42 without applying excessive stress to the lead conductor 42 at the point P. That is, the reliability of the lead wire 42 can be improved.

  Subsequently, the lead wire 42 bends at an angle of less than 90 degrees at the point Q in the same direction as the bending direction performed at the point P after passing through the recess 33 (θ2 in FIG. 3). As a result, the lead wire 42 can be brought close to and substantially parallel to the lead wire 43 drawn parallel to the edge of the magnetic sheet 3 in the tangential direction from the outermost periphery of the coil 21. θ1 is 60 to 80 degrees, and θ2 is 30 to 50 degrees. That is, the lead wire 42 was drawn in parallel to the edge of the magnetic sheet 3 in the tangential direction from the outermost periphery of the coil 21 by bending the lead wire 42 in two angles by combining the angles of θ1 and θ2 within these angle ranges. It is possible to easily bring the lead wire 42 close to and parallel to the lead wire 43, and to prevent the strength of the lead wire 42 from being reduced without applying excessive stress to the lead wire 42.

  Further, the concave portion 33 is provided on the end side (fourth quadrant in FIG. 3) from which the lead wire 43 is drawn on the magnetic sheet 3. Thereby, the lead-out lead wire 42 and the lead-out lead wire 43 drawn in parallel to the edge of the magnetic sheet 3 in the tangential direction from the outermost periphery of the coil 21 can be brought close to each other.

  When the above-described two bends are provided on the lead wire 42 drawn from the coil 21, the two terminals 22 and 23 of the planar coil portion 2 are arranged close to each other, so that these terminals are attached to the connector. It becomes easier to handle when performing wiring processing to the rear stage. Moreover, since the bending angle of the lead-out conducting wire 42 is less than 90 degrees in both places, the lead-out conducting wire 42 can be prevented from being deteriorated in strength without being excessively stressed. That is, the reliability of the lead wire 42 can be improved.

  Next, the non-contact charging device provided with the non-contact charging module 1 of the present invention will be described. The non-contact power transmission device includes a charger including a power transmission coil and a magnetic sheet, and a main device including a power receiving coil and a magnetic sheet. The main device is an electronic device such as a mobile phone. The circuit on the charger side includes a rectifying / smoothing circuit unit, a voltage conversion circuit unit, an oscillation circuit unit, a display circuit unit, a control circuit unit, and the power transmission coil. The circuit on the main device side includes the power receiving coil, a rectifier circuit unit, a control circuit unit, and a load L mainly composed of a secondary battery.

  The power transmission from the charger to the main device is performed using an electromagnetic induction action between the power transmission coil of the charger on the primary side and the power receiving coil of the main device on the secondary side.

  Since the non-contact charging device of the present embodiment includes the non-contact charging module described above, it is possible to prevent disconnection of the coil conductor and to reduce the size and thickness of the non-contact charging device.

  According to the non-contact charging module of the present invention, it is possible to prevent the coil lead wire from being disconnected and to reduce the thickness of the non-contact charging module. Therefore, the mobile terminal such as a mobile phone or a portable computer, or a portable device such as a video camera. It is useful as a non-contact charging module for various electronic devices.

DESCRIPTION OF SYMBOLS 1 Non-contact charge module 2 Planar coil part 21 Coil 22, 23 Terminal 42, 43 Leader lead 3 Magnetic sheet 33 Concave part 34 Slit

Claims (5)

A circular planar coil portion in which a conducting wire is wound in a spiral shape;
A rectangular magnetic sheet provided to face the planar coil portion;
A slit provided on the magnetic sheet and positioned on a line extending from a central portion of the magnetic sheet to a diagonal portion of the magnetic sheet; and
One of the conducting wires drawn out from the planar coil portion extends in parallel to one side of the magnetic sheet in the tangential direction of the outer periphery of the planar coil portion, and is drawn out from the magnetic sheet from the diagonal portion of the magnetic sheet. The other of the conducting wires drawn from the planar coil portion is drawn from the diagonal portion of the magnetic sheet via the slit, and one and the other of the conducting wires drawn from the diagonal portion of the magnetic sheet Are non-contact charging modules , which are close to each other and parallel to each other . The contactless charging module according to claim 1, wherein the slit extends from the diagonal portion from which one of the conductive wires is drawn toward a central portion. The other of the conducting wires drawn out from the planar coil part is a first bent part bent at an angle of 50 degrees to 80 degrees in a direction away from the center of the planar coil part, and the first bent part after passing through the slit. The contactless charging module according to claim 1, further comprising a second bent portion bent at an angle of 30 to 70 degrees in the same bending direction as the bent portion. The contactless charging module according to claim 1, wherein the diagonal portion of the magnetic sheet is curved. A non-contact charging device, wherein the planar coil portion provided in the non-contact charging module according to claim 1 is used for at least one of a power transmission coil or a power reception coil.

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