JP2014087137A - Contactless charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contactless charger which eliminates adverse effects on a circuit board which is caused by heat generation of a power transmission coil incorporated into the contactless charger and realizes measures for noise and heat dissipation.SOLUTION: A contactless charger is used for transferring electric power to a power reception coil 91 of a battery drive device 90 by magnetic induction action and charging a built-in battery 92. The contactless charger includes: a case 20 which has a placement surface 23 on which the battery drive device 90 is placed; a power transmission coil 11 which is electromagnetically coupled to the power reception coil 91 of the battery drive device 90 set on the placement surface 23; and a circuit board 13 formed by mounting an electronic component 14 which realizes an AC power source 12 for supplying an alternating-current power to the power transmission coil 11 thereon. The case 20 includes: a placement part 21 in which the placement surface 23 is provided as an inclined surface; and a base horizontal part 22 which supports the placement part 21. The power transmission coil 11 is placed on the rear side of the placement surface 23 and the circuit board 13 is disposed on a base part 22.

Description

  The present invention relates to a contactless charger capable of charging a battery housed in a battery-powered device such as a mobile phone, a smartphone, or a tablet by non-contact or wirelessly carrying power by electromagnetic induction. In particular, the present invention relates to a contactless charger that can be charged by setting a battery-driven device in an inclined posture.

  Many battery-driven devices typified by mobile devices such as mobile phones, smartphones, tablets, mobile music players, and digital cameras are driven by a battery pack to improve portability. To charge a battery pack stored in such a battery-powered device, with the battery pack stored in the battery-powered device, set the battery-powered device in the charger and physically connect the contacts to each other. Do. On the other hand, instead of such physical connection, the electric power is transferred from the power transmission coil built in the charging stand to the power reception coil built in the battery pack using the action of electromagnetic induction, and the battery pack Has been developed (see Patent Document 1). Such a contactless charging stand is shown in the perspective view of FIG.

  Such a charging stand 290 incorporates a power transmission coil that is excited by an AC power source, and a power receiving coil that is electromagnetically coupled to the power transmission coil is incorporated on the battery pack side attached to one battery drive device 291. ing. The battery pack further includes a circuit for rectifying the alternating current induced in the power receiving coil and supplying the battery to the battery for charging. According to this structure, the battery drive device 291 is placed on the charging stand 290, and the battery of the battery pack can be charged in a non-contact state.

  When charging the battery pack by such a non-contact and non-contact charging method, it is necessary to electromagnetically couple the power transmission coil to the power reception coil with high coupling efficiency. For this reason, it is calculated | required to arrange | position a power transmission coil in the position correctly positioned with the power receiving coil incorporated in the battery drive apparatus. For this reason, as shown in FIG. 12, for example, a protrusion 295 and a recess 296 are provided between the charging base 293 and the battery drive device 294, and the protrusion 295 and the recess 296 are engaged with each other to achieve positioning.

Special table 2009-504116

  However, in the conventional contactless charger, since the power transmission coil and the circuit board are close to each other, heat generated by the power transmission coil is transmitted to the circuit board, and there is a concern that the electronic components mounted thereon are adversely affected. It is also conceivable that noise propagates.

  The present invention has been made in view of such conventional problems. A main object of the present invention is to provide a non-contact charger capable of eliminating adverse effects on a circuit board due to heat generation of a power transmission coil built in the non-contact charger and realizing measures for noise and heat dissipation. .

Means for Solving the Problems and Effects of the Invention

In order to achieve the above object, according to the contactless charger according to the first aspect of the present invention, electric power is transferred to the power receiving coil 91 of the battery driving device 90 by magnetic induction to charge the built-in battery 92. To the case 20 having the mounting surface 23 on which the battery-driven device 90 is mounted, and the power receiving coil 91 of the battery-driven device 90 set on the mounting surface 23 is electromagnetically coupled And a circuit board 13 on which an electronic component 14 for realizing an AC power source 12 for supplying AC power to the power transmission coil 11 is mounted. The case 20 includes the mounting surface 23 described above. Is disposed as an inclined surface, and a base horizontal portion 22 that supports the mounting portion 21 is disposed. The power transmission coil 11 is disposed on the back side of the mounting surface 23, and the base portion is disposed. 22 shows the circuit board. It is arranged 13.
With the above configuration, the circuit board and the power transmission coil can be separated from each other, and the heat generated in the power transmission coil can be prevented from propagating to the circuit board. Moreover, it becomes possible to separate the electronic component of a circuit board with respect to the battery drive apparatus set to a mounting surface, and can reduce the situation where the noise which an electronic component emits is propagated to the battery drive apparatus side.

According to the non-contact charger according to the second aspect of the present invention, the mounting portion 21 is disposed in the rear portion of the base horizontal portion 22, and the circuit board 13 is disposed in front of the base horizontal portion 22. Can be arranged in the part.
In this specification, the position of the mounting portion is specified by the center position of the mounting portion in plan view, and the position of the circuit board is specified by the center position of the circuit board. Therefore, “the placement portion is disposed at the rear portion of the base horizontal portion and the circuit board is disposed at the front portion of the base horizontal portion” means that the center of the placement portion is a center line in the front-rear direction of the base horizontal portion. It is located behind n, and means that the center of the circuit board is located ahead of the center line n in the front-rear direction of the base horizontal portion.
With the configuration described above, the circuit board and the power transmission coil can be arranged apart from each other in the front-rear direction of the case, and the heat generated in the power transmission coil can be effectively prevented from propagating to the circuit board. Moreover, the electronic component of a circuit board can be spaced apart in the front-back direction with respect to the battery-driven device set on the mounting surface, and the situation where noise generated by the electronic component is propagated to the battery-driven device side can be reduced.

According to the contactless charger according to the third aspect of the present invention, the case 20 is disposed in the power transmission coil 11 disposed in the mounting portion 21 and the base horizontal portion 22 in plan view. The circuit board 13 can be disposed on the opposite sides of the center line m in the left-right direction.
In this specification, the position of the power transmission coil is specified by the center position of the power transmission coil, and the position of the circuit board is specified by the center position of the circuit board. Therefore, “the power transmission coil and the circuit board are arranged on opposite sides of the center line in the horizontal direction of the case” means that the center of the power transmission coil and the center of the circuit board are the center in the horizontal direction of the case in plan view. It shall mean a state located on the opposite side of the line.
With the configuration described above, the circuit board and the power transmission coil can be arranged apart from each other in the left-right direction of the case, and the heat generated in the power transmission coil can be effectively prevented from propagating to the circuit board. Moreover, the electronic component of a circuit board is spaced apart with respect to the battery drive apparatus set to a mounting surface in the left-right direction, and the situation where the noise which an electronic component emits is propagated to the battery drive apparatus side can be reduced.

According to the contactless charger according to the fourth aspect of the present invention, the circuit board 13 can mount the electronic component 14 on the lower surface side of the board.
With the above configuration, the electronic component placed on the lower surface side of the circuit board is separated from the battery-driven device placed on the placement surface, and noise generated by the electronic component is propagated to the battery-driven device side Can be reduced. In addition, since the electronic component disposed on the lower surface side of the circuit board is disposed to face the bottom surface side of the base horizontal portion, the heat generated by the electronic component can be efficiently radiated to the outside.

According to the contactless charger according to the fifth aspect of the present invention, the mounting portion 21 can be connected to the base horizontal portion 22 in a triangular shape in cross section.
With the above configuration, a space having a triangular shape in cross section can be provided on the back side of the placement surface, and heat generated by the power transmission coil arranged here can be naturally convected in the internal space of the placement portion.

According to the contactless charger according to the sixth aspect of the present invention, the mounting portion 21 can be formed in a plate shape having a substantially constant thickness.
With the above configuration, the heat generation of the power transmission coil arranged on the mounting surface is effectively radiated from the back side of the plate-shaped mounting portion to the outside of the case, thereby effectively Can dissipate heat.

According to the non-contact charger according to the seventh aspect of the present invention, the circuit board 13 built in the base horizontal portion 22 is replaced with the antenna built in the battery drive device 90 placed on the placement surface 23 described above. The antenna 97 can be arranged at a position not facing the antenna 97 and can be arranged at a position away from the antenna 97.
With the above configuration, it is possible to effectively prevent noise caused by electronic components mounted on the circuit board from adversely affecting the antenna even when the battery-driven device is placed on the placement surface and charged.

It is a block diagram which shows the state which set the battery drive apparatus to the non-contact charger which concerns on one embodiment of this invention. It is a perspective view which shows the state which sets a battery drive apparatus to the non-contact charger which concerns on one embodiment of this invention. It is the III-III sectional view taken on the line which shows the state which set the battery drive apparatus to the non-contact charger shown in FIG. It is a schematic plan view which shows the positional relationship of the power transmission coil and circuit board of the non-contact charger shown in FIG. It is a perspective view which shows the state which sets a battery drive apparatus to the non-contact charger which concerns on other embodiment of this invention. It is VI-VI sectional view taken on the line which shows the state which set the battery drive apparatus to the non-contact charger shown in FIG. It is a schematic plan view which shows the positional relationship of the power transmission coil and circuit board of the non-contact charger shown in FIG. It is a perspective view which shows the state which sets a battery drive apparatus to the non-contact charger which concerns on other embodiment of this invention. It is the IX-IX sectional view taken on the line which shows the state which set the battery drive apparatus to the non-contact charger shown in FIG. It is a schematic top view of the case used for description of the arrangement pattern of a power transmission coil and a circuit board. It is a perspective view which shows the conventional non-contact charger. It is a disassembled perspective view which shows the other conventional non-contact charger.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a contactless charger for embodying the technical idea of the present invention, and the present invention does not specify the contactless charger as follows. Furthermore, this specification does not limit the members shown in the claims to the members of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It is just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Further, in the following description, the same name and reference sign indicate the same or the same members, and detailed description will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some embodiments can be used in other embodiments.

  As shown in FIGS. 1 to 9, the contactless charger of the present invention places a battery driving device 90 including a rechargeable battery 92 and a power receiving coil 91 on a mounting surface 23, and magnetically connects the power receiving coil 91 to the power receiving coil 91. Power is transferred by induction, and the battery 92 built in the battery drive device 90 is charged. In particular, the contactless charger according to the present invention sets and charges the battery-driven device 90 with the mounting surface 23 as an inclined surface in an inclined posture. Here, the battery-powered device 90 can be a portable electronic device such as a mobile phone, a smartphone, or a tablet, or an electronic device such as an IC player or a digital camera. Furthermore, the battery drive device may be a battery pack or a battery pack. In addition, in the figure, the state which charges the smart phone type battery drive apparatus 90 by setting to the mounting surface 23 by placing horizontally is shown.

(Non-contact charger 10, 50, 60)
As shown in FIGS. 1 to 9, the non-contact chargers 10, 50, 60 receive power from the case 20 having the mounting surface 23 of the battery driving device 90 and the battery driving device 90 set on the mounting surface 23. A circuit in which a power transmission coil 11 that is electromagnetically coupled to the coil 91 and supplies power to the power receiving coil 91 by magnetic induction action, and an electronic component 14 that implements an AC power supply 12 that supplies AC power to the power transmission coil 11 is mounted. The power transmission coil 11 and the circuit board 13 are housed in a case 20.

(Case 20)
The case 20 is made of plastic, and includes a placement portion 21 having a placement surface 23 on which the battery-driven device 90 is detachably set, and a base horizontal portion 22 that supports the placement portion 21. In the case 20 shown in the figure, the base horizontal portion 22 has a box shape wide in the horizontal direction, and the mounting portion 21 is connected to the upper surface of the box-shaped base horizontal portion 22. The mounting portion 21 shown in the figure has a mounting surface 23 as an inclined surface, and is positioned in the central portion or the rear portion of the base horizontal portion 22 in a posture in which the mounting surface 23 that is an inclined surface is the front surface. ing. In the case 20, the power transmission coil 11 is disposed on the placement portion 21, and the circuit board 13 is disposed on the base horizontal portion 22. In this case 20, the power transmission coil 11 and the circuit board 13 are spaced apart from each other by disposing the power transmission coil 11 on the mounting part 21 and the circuit board 13 on the base horizontal part 22.

  The placement unit 21 includes a placement surface 23 on which the battery-driven device 90 is placed in an inclined posture. The mounting portion 21 has an outer shape of the mounting surface 23 that is a shape that follows the outer shape of the battery-driven device 90 and is rectangular. The rectangular mounting surface 23 has a shape in which the longitudinal direction is the horizontal direction so that the battery-driven device 90 can be placed horizontally. The mounting surface 23 has a size approximately equal to or slightly larger than the outer shape of the battery-driven device 90. The case 20 can stably set the battery drive device 90 on the mounting surface. However, the mounting surface can be made slightly smaller than the outer shape of the battery-driven device.

  The placement unit 21 is configured to hold the battery drive device 90 in a predetermined inclined posture in a state where the battery drive device 90 is set on the placement surface 23. As shown in FIGS. 3, 6, and 9, the mounting unit 21 inclines the mounting surface 23 with respect to the horizontal plane at a predetermined inclination angle α, and places the battery-driven device 90 in a predetermined inclination posture. It can be held. The case 20 has an angle at which the placement unit 21 holds the battery-powered device 90, that is, an inclination angle α of the placement surface 23 of 20 degrees to 80 degrees, preferably 30 degrees to 75 degrees, and more preferably 40 degrees to 70 degrees. As described above, the structure in which the inclination angle α is larger than 40 degrees and the mounting surface 23 is approximated to the standing posture makes it easy to see the characters and images on the screen displayed on the main surface of the battery-powered device 90 from the front. There is.

  Further, the case 20 is provided with a device holding portion 25 for holding the battery drive device 90 in the base horizontal portion 22 in order to hold the battery drive device 90 set on the placement surface 23 in an inclined posture. In the base horizontal portion 22A shown in FIGS. 2 and 3, the device holding portion 25 is a groove portion 25A provided in front of the lower end of the placement surface 23. The device holding unit 25 prevents the battery-driven device 90 from slipping by inserting and holding the lower end portion of the battery-driven device 90 in the groove 25A. The device holding unit 25 that is the groove portion 25 </ b> A guides the lower end portion of the battery-driven device 90 and holds the battery-driven device 90 in an inclined posture so that the screen disposed on the front surface of the battery-driven device 90 can be seen from the front. Furthermore, it is set as the depth or shape which can expose the center part of the surface plate 99A of the battery drive apparatus 90. Furthermore, the device holding portion 25 that is the groove portion 25A has a total length that is substantially equal to the total length of the battery-driven device 90, and is slightly larger. The device holding unit 25 has a feature that it can be set while accurately positioning the battery-powered device 90 having a specific outer shape. However, the apparatus holding part which is a groove part can also be set longer than the full length of a battery drive apparatus, and can set various battery drive apparatuses from which an external shape differs.

  Further, in the base horizontal portion 22B shown in FIGS. 5 and 6, the device holding portion 25 is a convex portion 25B that locks the front side of the lower end portion of the battery drive device 90 set on the placement surface 23. The base horizontal portion 22B shown in the figure is provided with convex portions 25B facing both sides of the battery-driven device 90, and the battery-driven device is in a state in which the front surface of the lower end portion of the battery-driven device 90 is in contact with these convex portions 25B. 90 is set to prevent the battery-driven device 90 from slipping down. The device holding unit 25, which is the convex portion 25B, has a screen arranged on the front surface of the battery-driven device 90 from the front in a state where the lower end of the battery-driven device 90 is brought into contact with and holds the battery-driven device 90 in an inclined posture. As can be seen, the height or shape is such that the central portion of the surface plate 99A of the battery-powered device 90 can be exposed. However, the device holding portion may be formed in another shape that can hold the battery-driven device set on the mounting surface in an inclined posture, for example, a protrusion or a recess that locks the lower end of the battery-driven device.

  The placement unit 21 has the power transmission coil 11 disposed on the inner surface of the placement surface 23. The placement unit 21 fixes the power transmission coil 11 at a position facing the power reception coil 91 of the battery drive device 90 set on the placement surface 23. The mounting unit 21 has the power transmission coil 11 disposed at a position facing the power receiving coil 91 built in the battery driving device 90 in a state where the battery driving device 90 is set on the mounting surface 23.

  The placement unit 21 displays the position of the power transmission coil 11, in other words, the position where the battery drive device 90 is set on the placement surface 23, and reliably places the power reception coil 91 of the battery drive device 90 against the power transmission coil 11. Can be electromagnetically coupled. 2, 5, and 8 is provided with a guide 24 that indicates the mounting position of the battery drive device 90 on the mounting surface 23. The placement unit 21 shown in the figure displays, as a guide 24, the set position of the battery-powered device 90 with graphics 24A, 24B, and 24C. In the figure, a graphic 24A displays the outer shape of the battery-driven device 90 to be set, a graphic 24B displays the position of the power receiving coil 91 of the battery-driven device 90, and the graphic 24C is at a specific position of the battery-driven device 90. The set position of the displayed mark 98 (details will be described later) is displayed. The placement unit 21 can display these figures 24A, 24B, and 24C alone or in combination. Further, the placement position of the battery-powered device can be displayed by a display other than these figures. Such a display indicating the set position can be provided on the placement surface 23 of the placement portion 21 by printing, stamping, or the like, or can be displayed with a sticker or the like attached thereto. These non-contact chargers 10, 50, 60 can be arranged at a normal set position by setting the battery drive device 90 at the position indicated by the guide 24.

  Furthermore, the non-contact charger that sets only the battery-driven device having a specific outer shape on the mounting surface has the outer shape of the mounting surface substantially equal to the outer shape of the specific battery-driven device, or a groove portion that is a device holding unit Is made equal to the total length of the specific battery-driven device, so that the battery-driven device can be arranged at a fixed position on the placement surface without providing a guide on the placement surface. It is possible to specify the battery drive device set position in the state where the outer periphery of the battery drive device is arranged along the outer periphery of the mounting surface or the lower end of the battery drive device is inserted into the groove which is the device holding portion. Because.

  In addition, the contactless charger that makes the outer surface of the mounting surface larger than the outer shape of the battery-driven device is a guide that indicates a plurality of set positions so that a plurality of types of battery-driven devices can be placed at the correct set position on the mounting surface. Can also be provided. This non-contact charger can set and charge a plurality of types of battery-driven devices at accurate positions.

  The mounting portions 21A and 21B shown in FIGS. 2 to 7 are connected to the base horizontal portion 22 with a substantially triangular cross-sectional shape. Since the case 20A, 20B of this shape is formed with a triangular space 26 in cross-sectional view on the back side of the mounting surface 23, the heat generated by the power transmission coil 11 arranged here is indicated by the arrows in FIGS. As shown, there is a feature that heat can be effectively radiated by natural convection in the space 26 inside the placement portions 21A and 21B.

  The case 20A shown in FIG. 3 has a structure in which the placement portion 21A and the base horizontal portion 22A are integrally connected, and the placement portion 21A and the base horizontal portion 22A communicate with each other. With this structure, the mounting portion 21A and the base horizontal portion 22A can be integrally formed to reduce the manufacturing cost. Moreover, the case 20B shown in FIG. 6 forms the mounting part 21B and the base horizontal part 22B separately, and connects them together. The case 20B shown in the figure has a structure in which a partition wall 27 is formed at the boundary portion without communicating the mounting portion 21B and the base horizontal portion 22B separately formed inside, and the inside of the mounting portion 21B and the base horizontal portion are formed. The inside of the portion 22B is partitioned. As described above, the case 20B in which the inside of the mounting portion 21B and the inside of the base horizontal portion 22B are partitioned by the partition wall 27 has a feature that can effectively prevent the heat generated by the power transmission coil 11 from being propagated to the circuit board 13. .

  Further, the mounting portion 21C shown in FIGS. 8 and 9 is formed in a plate shape having a substantially constant thickness, and the lower end portion is connected to the base horizontal portion 22C. The plate-shaped mounting portion 21C includes a main body plate 21X having a front surface as a mounting surface 23, and a holder 30 fixed to the back surface of the main body plate 21X. The plate-like mounting portion 21C has its lower end fixed to the base horizontal portion 22C so that the inclination angle α of the mounting surface 23 becomes a predetermined angle. The case 20C having this structure dissipates the heat generated by the power transmission coil 11 disposed inside the placement surface 23 from the back side of the plate-like placement portion 21C to the outside, and is transmitted on the placement portion 21C. There exists the characteristic which can thermally radiate the heat_generation | fever of the coil 11 effectively. In addition, there is a feature that heat generated from components mounted on the circuit board 13 disposed in the base horizontal portion 22C can be effectively radiated from the upper surface of the base horizontal portion 22C. Furthermore, although not shown, the plate-like mounting portion can be rotatably connected to the base horizontal portion so that the inclination angle α of the mounting surface can be changed. In this case, the tilting angle α of the mounting surface can be adjusted to an optimum angle by adopting a structure in which the rotating mounting portion can be stopped and fixed at a desired position with respect to the base horizontal portion.

  As described above, the contactless chargers 10, 50, and 60 that place the placement surface 23 in an inclined posture tilt the battery drive device 90 by setting the battery drive device 90 on the placement surface 23 in the inclined posture. The battery can be charged while being held in a posture so that the screen of the battery-powered device 90 is easy to see. In particular, as shown in the figure, the battery-driven device 90 can be charged while looking at the screen of the battery-driven device 90 by setting the battery-driven device 90 in the contactless charger 10, 50, 60 in a landscape orientation. In addition, by placing the mounting surface 23 in an inclined posture, it is possible to reliably avoid a situation where a foreign object such as a metal enters between the battery-powered device 90 and the mounting surface 23.

  The placement unit 21 fixes the power transmission coil 11 at a fixed position inside the placement surface 23. The power transmission coil 11 is disposed so as to be close to the inner surface of the placement surface 23, the distance between the power reception coil 91 is narrowed, and power can be efficiently transferred from the power transmission coil 11 to the power reception coil 91. The mounting unit 21 shown in FIGS. 3, 6, and 9 includes a holder 30 that places the power transmission coil 11 at a fixed position inside the mounting surface 23. The placement unit 21 fixes the power transmission coil 11 at a fixed position inside the placement surface 23 via the holder 30. 3, 6, and 9, the holder 30 and the power transmission coil 11 are shown in cross-section for easy understanding of the structure of the holder 30. The holder 30 shown in the figure includes a coil fitting recess 31 for placing the power transmission coil 11 at a fixed position. The coil fitting concave portion 31 is a circular concave portion formed in an inner shape equal to the outer shape of the power transmission coil 11 that is a spiral planar coil, and a fitting convex portion that guides the air core portion of the power transmission coil 11 at the center portion. 32 is formed. The holder 30 is fixed to the inner surface side of the placement surface 23 in a state where the power transmission coil 11 is fitted into the coil fitting recess 31, and can be arranged while positioning the power transmission coil 11 at a fixed position of the placement portion 21. The power transmission coil 11 is disposed at a fixed position of the placement unit 21 via the holder 30. Furthermore, the holder 30 can also increase the magnetic field of the power transmission coil 11 by arranging a core on the insertion convex portion 32. A magnetic material such as ferrite having a high magnetic permeability can be used for this core. With this structure, the magnetic flux of the power transmission coil 11 is focused by the core, and power can be efficiently transferred to the power reception coil.

  However, the power transmission coil can be fixed to the inside of the placement surface without using a holder. For example, the mounting portion is formed with a fitting recess for fitting the power transmission coil on the inner surface side of the mounting surface, and the power transmission coil is disposed in the fitting recess and fixed at a fixed position on the mounting surface. Can do. Furthermore, the power transmission coil can be inserted and fixed on the inner surface side of the mounting surface. This structure can further shorten the distance from the power receiving coil of the battery drive device set on the mounting surface.

  The base horizontal portion 22 houses and fixes the circuit board 13 therein. The base horizontal part 22 arranges the circuit board 13 in a horizontal posture and is arranged away from the power transmission coil 11 arranged in the mounting part 21. In this way, the structure in which the circuit board 13 arranged inside the base horizontal portion 22 is arranged away from the power transmission coil 11 effectively prevents the heat generation of the power transmission coil 11 from adversely affecting the circuit board 13 while The circuit board 13 can be protected from the heat generation of the power transmission coil 11. In particular, the case 20 containing the power transmission coil 11 and the circuit board 13 has a front-rear view of the position of the power transmission coil 11 disposed on the mounting portion 21 and the position of the circuit board 13 disposed on the base horizontal portion 22 in plan view. By separating in the direction or the left-right direction, it can be separated more ideally. In this specification, the position of the power transmission coil 11 is specified by the center position of the power transmission coil 11, and the position of the circuit board 13 is specified by the center position of the circuit board 13. Further, the position of the mounting portion 21 connected to the base horizontal portion 22 is also specified by the center position of the mounting portion 21 in plan view.

  Here, the contactless charger 10 shown in FIG. 2 to FIG. 4 has the placement portion 21A disposed at the rear portion of the base horizontal portion 22A and the circuit board 13 disposed at the front portion of the base horizontal portion 22A. Yes. As shown in FIG. 4, the contactless charger 10 has the power transmission coil 11 disposed on the mounting portion 21A disposed behind the center line m in the front-rear direction of the base horizontal portion 22A, and the base horizontal portion 22A. The circuit board 13 disposed at the front is disposed in front of the center line m in the front-rear direction. This structure can arrange | position the power transmission coil 11 and the base horizontal part 22 in the state spaced apart not only in the up-down direction but in the front-back direction.

  Furthermore, the non-contact charger 50 shown in FIGS. 5 to 7 is configured so that, in plan view, the power transmission coil 11 disposed in the mounting portion 21B and the circuit board 13 disposed in the base horizontal portion 22B are arranged in the left-right direction. They are arranged on opposite sides of the center line n. In the non-contact charger 50 shown in FIG. 7, the power transmission coil 11 disposed in the mounting portion 21A is disposed on the left side of the center line n in the left-right direction of the base horizontal portion 22A and is disposed in the base horizontal portion 22A. The circuit board 13 is arranged on the right side of the center line n in the left-right direction. This structure can arrange | position the power transmission coil 11 and the base horizontal part 22 in the state which spaces apart not only in an up-down direction but in the left-right direction.

  However, the position of the power transmission coil arranged in the placement part and the position of the circuit board arranged in the base horizontal part in plan view are not specified in the above example. In the non-contact charger, the power transmission coil and the circuit board can be arranged in various patterns that are in a positional relationship apart from each other. Here, the arrangement pattern in plan view of the power transmission coil and the circuit board will be described with reference to FIG. FIG. 10 is a plan view showing the outer shape of the case 20, in which the region of the case 20 is divided into four regions A to D by a center line m in the front-rear direction and a center line n in the left-right direction. Is shown. In this figure, in the state where the power transmission coil is disposed in the region A, the circuit boards can be disposed more ideally by disposing the circuit boards in the regions BD. In particular, it can be most ideally separated by arranging in the region C which is a diagonal position. Similarly, in the state where the power transmission coil is arranged in the region B, the circuit boards are arranged in the regions A, C, and D so that they can be separated more ideally. In particular, it can be separated most ideally by arranging in the region D which is a diagonal position. Furthermore, in a state where the power transmission coil is arranged in the middle of the areas A and B, the circuit board can be arranged in the area C or D so that they can be separated more ideally.

  As described above, the structure in which the power transmission coil 11 and the circuit board 13 are spaced apart in the front-rear direction or the left-right direction in plan view can more reliably prevent the heat generation of the power transmission coil 11 from adversely affecting the circuit board 13. Thus, the circuit board 13 can be protected from the heat generation of the power transmission coil 11. However, the arrangement of the power transmission coil and the circuit board is not necessarily specified as a positional relationship that is separated in the front-rear direction and the left-right direction in a plan view. Therefore, the circuit board 13 can be protected from the heat generation of the power transmission coil 11.

(Power transmission coil 11)
The power transmission coil 11 is a planar coil in which a wire is wound in a spiral shape so that it can be arranged on the inner surface side of the mounting surface 23 of the mounting portion 21 in parallel with the mounting surface 23. The power transmission coil 11 is wound in a spiral shape in a plane parallel to the placement surface 23, and radiates an alternating magnetic flux in a direction orthogonal to the placement surface 23. The power transmission coil 11 is formed as a thick coil by winding a spiral in a plurality of layers. Furthermore, the power transmission coil may be an oval shape that is long in the vertical direction. This shape of the power transmission coil is characterized in that it can be charged by being electromagnetically coupled to the power receiving coil even when the power receiving coil is set on the mounting surface and the power receiving coil has different vertical positions. As shown in FIGS. 3, 6, and 9, the power transmission coil 11 disposed on the inner surface of the mounting surface 23 has a shield plate 41 disposed on the opposite surface opposite to the mounting surface 23. Magnetic shield. The shield plate 41 is a plate made of a metal or ferrite having a high magnetic permeability. The shield plate 41 is fixed to the bottom surface of the coil fitting recess 31 of the holder 30.

  The inductance of the power transmission coil 11 is set to an optimum value depending on the frequency of the AC power. For example, the power transmission coil 11 having a frequency of supplied AC power of 100 kHz to 500 kHz has an inductance of several tens of μH to several mH. However, the non-contact charger does not specify the frequency of the AC power supplied to the power transmission coil 11 within this range. This is because AC power having a frequency lower than 100 kHz or higher than 500 kHz can be supplied to the power transmission coil 11 so that power can be conveyed to the battery driving device 90 by magnetic induction. The inductance of the power transmission coil 11 is small when the frequency of the AC power is high, and is large when the frequency is low, so that power can be efficiently conveyed to the power receiving coil 91 by magnetic induction.

(Circuit board 13)
The circuit board 13 is a printed board on which an electronic component 14 that implements an AC power supply 12 that supplies power to the power transmission coil 11 is mounted. Furthermore, the circuit board 13 can also mount an electronic component 14 other than the electronic component that realizes the AC power supply 12. The circuit board 13 shown in FIG. 3 has an electronic component 14 mounted on the lower surface side. In this circuit board, as shown in FIG. 3, the electronic component 14 disposed on the lower surface side is disposed in a posture facing the inner surface of the bottom surface 22 </ b> X of the base horizontal portion 22. In this structure, the electronic component 14 arranged on the lower surface side of the circuit board 13 can be separated from the battery driving device 90 placed on the placement surface 23, so that noise generated by the electronic component 14 is generated by the battery driving device 90. It is possible to effectively prevent adverse effects on the side. In addition, this structure has a feature that heat can be effectively radiated from the lower surface of the base horizontal portion 22 by facing a part that easily generates heat to the bottom surface 22X. However, as shown in FIG. 6 and FIG. 9, the circuit board 13 can also mount the electronic component 14 on the upper surface side.

  The circuit board 13 is fixed to the base horizontal portion 22 via a set screw 40. The base horizontal portion 22 shown in FIGS. 3, 6, and 9 is integrally provided with a connecting boss 28 that fixes the circuit board 13. The circuit board 13 is fixed to a connecting boss 28 provided inside the base horizontal portion 22 and held in a predetermined posture. The circuit board 13 is fixed to a fixed position of the base horizontal portion 22 by screwing a set screw 40 penetrating the circuit board 13 into the connecting boss 28. However, the circuit board can also be fixed to the base horizontal portion by a method such as a locking structure or adhesion.

(AC power supply 12)
The AC power supply 12 converts input power into AC having a frequency to be supplied to the power transmission coil 11 and outputs the AC. The AC power supply 12 includes an oscillation circuit and a power amplifier that amplifies the AC output from the oscillation circuit. The AC power source 12 receives DC from an AC adapter or DC from a connector such as a USB connector. Further, the AC power supply can also input an AC commercial power supply, convert it to an AC having a frequency to be supplied to the power transmission coil 11, and output the AC. A contactless charger 10 shown in FIG. 1 inputs a direct current input from an AC adapter 49 that is an external power supply to an alternating current power supply 12. As shown in FIGS. 2, 5, and 8, the contactless chargers 10, 50, and 60 are provided with the input connector 19 connected to the AC adapter 49 in the case 20. The input connector 19 shown in the figure is a pin terminal into which the output terminal 49A of the AC adapter 49 can be inserted. However, a USB connector can also be used as the input connector. Although not shown, this non-contact charger can supply power by using a USB cable connected to an electronic device as an external power source and connecting the USB terminal of the USB cable to a USB connector. This structure can be conveniently fed from an electronic device such as a personal computer on a desk such as an office. The AC power supply 12 converts the input direct current or alternating current into alternating current having a predetermined frequency and voltage, and outputs the alternating current to the power transmission coil 11. An AC power supply 11 that receives DC power from an AC adapter 49 or a connector converts DC power into AC power by a DC / AC inverter and outputs the AC power. An AC power source that inputs AC from a commercial power source converts AC to DC by a rectifier circuit, converts DC output from the rectifier circuit to AC by a DC / AC inverter, and outputs the AC to the power transmission coil 11.

  The AC power supply 12 detects that the battery drive device 90 is set, or the user turns on a power switch (not shown) to output AC power to the power transmission coil 11. The AC power supply 12 that detects the battery drive device 90 includes a detection circuit (not shown) for the power receiving coil 91 provided in the battery drive device 90. Further, the AC power supply 11 detects that the built-in battery 92 of the battery drive device 90 is fully charged, and stops the output of AC power from the power transmission coil 11. The AC power supply 12 detects a change in the current of the power transmission coil 11 and detects the full charge of the built-in battery 92. When the built-in battery 92 of the battery drive device 90 is fully charged, the power receiving coil 91 is unloaded and the current of the power receiving coil 91 is almost cut off. When the current of the power receiving coil 91 is substantially cut off, the current of the power transmitting coil 11 also decreases. Therefore, the AC power supply 12 can detect that the current of the power transmission coil 11 has become smaller than the set value, and can detect that the built-in battery 92 of the battery drive device 90 is fully charged. Furthermore, the non-contact charger can also detect the state of charge of the battery, for example, full charge or charging abnormality through communication with the battery-driven device.

  Further, the non-contact chargers 10, 50, 60 shown in FIGS. 1 to 3, 5, 6, 8, and 9 can be used to set the battery drive device 90 and the charge state of the built-in battery 92 externally. The display part 15 for displaying on is provided. The non-contact chargers 10, 50, 60 shown in the figure include an LED 16 that displays light outside the case 20 as a display unit 15, and a display window 29 provided in the case 20 that transmits light emitted from the LED 16. And a lamp reader 17 for irradiating the outside. The LED 16 shown in the figure is a chip-type LED and is fixed to the circuit board 13. The lamp reader 17 is made of translucent plastic, has one end facing the LED 16 and the other end exposed to the outside from a display window 29 provided in the case 20. The lamp reader 17 transmits light emitted from the LED 16 to the inside and irradiates the display window 29 to the outside.

  The above display unit 15 displays whether or not the power receiving coil 91 of the battery drive device 90 is in an accurate position with respect to the power transmission coil 11 in a state where the battery drive device 90 is set on the mounting plate 21. be able to. The display unit 15 can also detect that the battery 92 of the battery-driven device 90 is fully charged and display this fact to the outside. Therefore, the user can accurately determine whether or not the battery drive device 90 is correctly set according to the display on the display unit 15 or whether or not the battery 92 of the battery drive device 90 is fully charged.

  The lighting state of the LED 16 of the display unit 15 is controlled by a lighting circuit 18 mounted on the circuit board 13. The lighting circuit 18 changes the emission color (for example, green, red) of the LED 16 and the lighting pattern (for example, continuous lighting, slow blinking, fast blinking) and the like, thereby changing the battery 92 built in the battery drive device 90. Charge status and abnormality can be displayed externally. For example, the LED 16 is turned on during charging and turned off after charging is completed, or in the case of an LED whose emission color can be changed, the user is charged or finished charging by changing the color from red to green. Can be announced. Further, the lighting circuit 18 can display an abnormality by blinking the LED 16 in a state where the battery-driven device 90 is not set at the correct position.

  Further, the contactless chargers 10, 50, 60 described above are configured so that the circuit board 13 built in the base horizontal portion 22 is not opposed to the antenna 97 built in the battery driving device 90 placed on the placement surface 23. The circuit board 13 is arranged at a position away from the antenna 97. In other words, the placement position of the battery drive device 90 is such that the antenna 97 built in the battery drive device 90 set on the placement surface 23 is away from the circuit board 13 built in the base horizontal portion 22. Has been identified. Here, the antenna 97 built in the battery-powered device 90 is a receiving antenna for receiving one-segment broadcasting, multimedia broadcasting, or the like. The battery-powered device 90 incorporating such an antenna 97 includes these antennas. Examples include mobile phones, smartphones, tablets, and the like having a reception function. As shown in FIGS. 2, 5, and 8, the antenna 97 is built in one end of the battery drive device 90. Therefore, the contactless chargers 10, 50, 60 are shown in FIGS. 4 and 7 so that the circuit board 13 is positioned away from the antenna 97 built in the battery drive device 90 set on the mounting surface 23. As shown, the center of the circuit board 13 is decentered from the center line n in the left-right direction of the base horizontal portion 22 in plan view. As described above, the contactless chargers 10, 50, and 60 that separate the circuit board 13 built in the base horizontal portion 22 from the antenna 97 built in the battery driving device 90 set on the mounting surface 23 are batteries. Even during charging of the driving device 90, it is possible to effectively prevent the noise caused by the electronic component 14 mounted on the circuit board 13 from adversely affecting the antenna 97 while receiving images such as one-segment broadcasting and multimedia broadcasting. In particular, since this noise is reduced in inverse proportion to the square of the distance from the antenna 97, the circuit board 13 is arranged eccentric from the center line n of the base horizontal portion 22, and the antenna 97 is arranged on the opposite side. Thus, the influence of noise can be reduced by increasing the distance from the antenna 97. Further, in the contactless chargers 10, 50, 60 shown in the figure, in addition to the circuit board 13, the LED 16, the input connector 19, and their wiring are also unevenly distributed in a direction away from the antenna 97 built in the battery drive device 90. Thus, the adverse effect on the antenna 97 by these members is prevented.

  However, the antenna built in the battery-powered device is not limited to a receiving antenna that receives one-segment broadcasting, multimedia broadcasting, or the like. For example, a battery-powered device such as a mobile phone or a smartphone has a built-in transmission / reception antenna for transmitting / receiving voice communication and data communication (not shown). In the contactless charger, the circuit board built in the base horizontal portion can be arranged at a non-opposing position even with respect to this antenna, and the circuit board can be arranged at a position away from the antenna. This contactless charger can effectively prevent adverse effects due to noise on incoming / outgoing calls and transmission / reception of data communications such as e-mails even during charging of battery-powered devices.

  The non-contact chargers 10, 50, 60 described above are magnetically induced to the battery drive device 90 set at a fixed position on the mounting surface 23 of the case 20, as shown in FIGS. 3, 6, and 9. Power is transferred to charge the battery 92 built in the battery drive device 90.

(Battery drive device 90)
As shown in FIG. 1, the battery-driven device 90 is electromagnetically coupled to the power transmission coil 11 of the contactless charger 10 and receives a power received from the power transmission coil 11, and is guided to the power reception coil 91. A battery 92 that is charged with electric power and a charging circuit 93 that charges the built-in battery 92 with electric power induced in the power receiving coil 91. The battery drive device 90 shown in the figure has a power receiving coil 91, a battery 92, and a charging circuit 93 built in a device case 99. The device case 99 shown in the figure has an outer shape along the placement surface 23 of the case 20 and has a rectangular shape in plan view.

  The battery drive device 90 including the rechargeable battery 92 and the power receiving coil 91 incorporates the power receiving coil 91 and the battery 92 as a detachable battery pack in the device main body or a structure that cannot be detached from the device main body. Alternatively, only the battery can be built in a detachable battery pack, and the power receiving coil can be built in a structure that cannot be detached from the device body. A battery driving device having a power receiving coil built in the device main body and built in a battery pack in which a battery can be attached / detached connects the power receiving coil and the battery pack with a contact, and charges the battery with electric power induced in the power receiving coil. Further, in a battery-driven device in which a rechargeable battery is built in the device main body as a battery pack, a charging circuit for charging the battery can be built in the device main body side or in the battery pack side.

  The battery 92 is a lithium ion battery or a polymer battery. The polymer battery is a lithium polymer battery. However, the battery can be any rechargeable battery such as a nickel metal hydride battery or a nickel cadmium battery.

  The power receiving coil 91 is a flat coil obtained by winding a wire in a spiral shape on a flat surface. The power receiving coil 91 of the planar coil has a spiral shape wound in one layer or a plurality of layers, the entire shape is a disk shape, and the outer shape is circular. The power receiving coil 91, which is a planar coil, can be incorporated in the battery drive device 90 in a space-saving manner. However, the power receiving coil may be a thick coil. The battery-driven device 90 shown in FIGS. 2 and 3 incorporates a power receiving coil 91 at a position facing the power transmitting coil 11 while being set at a fixed position on the mounting surface 23. The battery-driven device 90 shown in the figure has a power receiving coil 91 built inside a back plate 99B of the device case 99. The battery driving device 90 can fix the power receiving coil 91 in close contact with the inner surface of the back plate 99B, or can be inserted into the back plate 99B and placed in a fixed position.

  As shown in the block diagram of FIG. 1, the charging circuit 93 rectifies the alternating current induced in the power receiving coil 91 and converts it into direct current, and smoothes the pulsating current rectified by the rectifying circuit 94. A smoothing capacitor 95A of the smoothing circuit 95 and a charge control circuit 96 that charges the battery 92 with the direct current smoothed by the smoothing circuit 95 are provided. The charging circuit 93 charges the battery 92 with a preferable voltage and current. The charging circuit 93 of the battery driving device 90 in which the battery 92 is a lithium ion battery uses the charging control circuit 96 as a constant voltage / constant current circuit that charges the battery 92 with a constant voltage and current. In battery-driven devices that use alkaline batteries such as nickel metal hydride batteries, the charge control circuit is a constant current circuit.

  Furthermore, the battery-driven device can detect that the battery is fully charged, stop charging, and transmit a full charge signal to the contactless charger. The battery-driven device can output a full charge signal to the power receiving coil, transmit the full charge signal from the power receiving coil to the power transmission coil, and transmit full charge information to the contactless charger. The battery-driven device outputs an AC signal having a frequency different from that of the AC power source to the power receiving coil, and the contactless charger can detect the full charge by receiving the AC signal with the power transmitting coil. In addition, a battery-driven device outputs a signal that modulates a carrier wave of a specific frequency with a full charge signal to the power receiving coil, and a contactless charger receives the carrier wave of a specific frequency and demodulates this signal to detect a full charge signal. You can also Further, the battery-driven device can transmit full charge information by wirelessly transmitting a full charge signal to the contactless charger. The battery-powered device has a built-in transmitter that transmits a full charge signal, and the contactless charger has a built-in receiver that receives the full charge signal. The non-contact charger detects a full charge signal transmitted from the battery-driven device and stops carrying power from the power transmission coil.

  In the battery drive device 90 described above, the built-in receiving coil 91 is electromagnetically coupled to the power transmission coil 11 of the mounting surface 23 in a state where the battery receiving device 90 is set at the set position of the mounting surface 23 of the contactless chargers 10, 50, 60. The The battery drive device 90 is set at the set position with the guide 24 provided on the placement surface 23 as a guide. Furthermore, the battery-driven device 90 can display a mark 98 indicating the placement direction in order to set the placement surface 23 more accurately. The battery-driven device 90 shown in FIGS. 2, 5, and 8 displays a triangular mark 98 on the side edge of the surface plate 99A of the device case 99 that is the main surface. The battery-driven device 90 shown in the figure displays a triangular mark 98 at the midpoint of the long side of the rectangular surface plate 99A and the upper side when set on the mounting surface 23. In the state where the battery drive device 90 is set on the mounting surface 23, the position of the lower end of the battery drive device 90 is positioned by the device holding unit 25, and the left and right positions of the battery drive device 90 are specified by the mark 98 and the guide 24. Is done. The battery-driven device 90 is disposed at an accurate position on the mounting surface 23 such that the mark 98 of the surface plate 99A faces the figure 24C, which is a triangular mark displayed on the mounting surface 23. The In the example shown in the figure, the smartphone type battery-driven device 90 is used. However, the present invention is not limited to this, and may be a battery-driven device such as a mobile phone.

  The contactless charger according to the present invention can be suitably used for charging a battery-driven device having a rechargeable battery, for example, a mobile phone, a smartphone, a tablet, or the like. In particular, it is optimal for charging in a state where the battery-powered device is set in an inclined posture.

DESCRIPTION OF SYMBOLS 10 ... Non-contact charger 11 ... Power transmission coil 12 ... AC power supply 13 ... Circuit board 14 ... Electronic component 15 ... Display part 16 ... LED
17 ... Lamp reader 18 ... Lighting circuit 19 ... Input connector 20 ... Case 20A ... Case
20B ... Case
20C ... Case 21 ... Placement part 21A ... Placement part
21B ... Placement section
21C: Placement part
21X ... Main body plate 22 ... Base horizontal part 22A ... Base horizontal part
22B ... Base horizontal part
22C ... Base horizontal part
22X ... bottom surface 23 ... mounting surface 24 ... guide 24A ... graphic
24B ... Figure
24C ... Figure 25 ... Device holder 25A ... Groove
25B ... convex 26 ... space 27 ... partition 28 ... connection boss 29 ... display window 30 ... holder 31 ... coil fitting recess 32 ... inserting projection 40 ... set screw 41 ... shield plate 49 ... AC adapter 49A ... output terminal 50 ... Non-contact charger 60 ... Non-contact charger 90 ... Battery drive device 91 ... Power receiving coil 92 ... Battery 93 ... Charging circuit 94 ... Rectifier circuit 95 ... Smoothing circuit 95A ... Smoothing capacitor 96 ... Charge control circuit 97 ... Antenna 98 ... Mark 99 ... Equipment case 99A ... Surface plate
99B ... Back plate 290 ... Charge stand 291 ... Battery drive device 293 ... Charge stand 294 ... Battery drive device 295 ... Protrusion 296 ... Recess m ... Center line n ... Center line

Claims (7)

A non-contact charger for transferring power by magnetic induction to a power receiving coil of a battery-driven device and charging a built-in battery,
A case having a mounting surface on which the battery-powered device is mounted;
A power transmission coil that is electromagnetically coupled to a power reception coil of a battery-driven device set on the mounting surface;
A circuit board on which an electronic component that realizes an AC power supply for supplying AC power to the power transmission coil is mounted, and the case includes a mounting portion provided with the mounting surface as an inclined surface,
A base horizontal part that supports the mounting part,
While arranging the power transmission coil on the back side of the mounting surface,
A contactless charger, wherein the circuit board is disposed on the base horizontal portion. The contactless charger according to claim 1,
The non-contact charger according to claim 1, wherein the placement unit is disposed at a rear portion of the base horizontal portion, and the circuit board is disposed at a front portion of the base horizontal portion. The contactless charger according to claim 1 or 2,
In the plan view, the power transmission coil disposed in the mounting portion and the circuit board disposed in the base horizontal portion are disposed on opposite sides with respect to the center line in the left-right direction in plan view. A contactless charger characterized by A contactless charger according to any one of claims 1 to 3,
A contactless charger, wherein the circuit board is formed by mounting the electronic component on a lower surface side of the board. A contactless charger according to any one of claims 1 to 4,
The non-contact charger according to claim 1, wherein the placing portion is connected to the base horizontal portion in a triangular shape in cross section. A contactless charger according to any one of claims 1 to 4,
A contactless battery charger, wherein the mounting portion is formed to have a substantially constant thickness. A contactless charger according to any one of claims 1 to 6,
The circuit board built in the horizontal part of the base is arranged at a position not facing the antenna built in the battery drive device mounted on the mounting surface, and is arranged at a position away from the antenna. A contactless charger characterized by that.

Images