JP2015095958A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of achieving high charging efficiency.SOLUTION: A power-receiving unit 21 includes a power-receiving-side coil 23 of a first shape, a power-receiving-side coil 24 of a second shape, a selection unit 25 for selecting the power-receiving-side coil 23 of the first shape or the power-receiving-side coil 24 of the second shape as a coil for receiving power transmitted from a power transmitter, and a control unit 26. The control unit 26 compares the magnitude of power received by the power-receiving-side coil 23 of the first shape with the magnitude of power received by the power-receiving-side coil 24 of the second shape to select one of the power-receiving-side coils that has received larger power.

Description

  The present invention relates to an electronic device having a charging function.

  A technique for charging a secondary battery built in an electronic device such as a mobile phone or a digital camera in a contactless manner is known. The electronic device and the dedicated charger corresponding thereto are each provided with a coil that transmits electric power for charging, and AC power is transmitted from the charger to the electronic device by electromagnetic induction in both coils. Is converted to DC power to charge the secondary battery (see, for example, Patent Document 1).

JP 2006-333557 A

By the way, there exists a problem that charge efficiency worsens, so that the coil shape by the side of an electronic device and the coil shape by the side of a charger differ.
An object of this invention is to provide the electronic device which can implement | achieve high charging efficiency.

  In order to solve the above-described problem, an electronic device according to the present invention includes an electric power receiving unit that receives electric power transmitted wirelessly from a power transmitter, and the electric power receiving unit includes a first shape power receiving side coil, A selection unit that selects the first shape power reception side coil or the second shape power reception side coil as a second shape power reception side coil, and a coil that receives power transmitted from the power transmitter; and a control unit; The control unit compares the magnitude of the power received by the first shape of the power receiving side coil with the magnitude of the power received by the second shape of the power receiving side coil. The power receiving side coil is selected.

  The electronic device further includes a rechargeable battery that is electrically connected to the first shape power receiving side coil or the second shape power receiving side coil, and selecting the first shape power receiving side coil is the first shape. Is to electrically connect the power receiving side coil and the rechargeable battery, and selecting the second shape power receiving side coil electrically connects the second shape power receiving side coil and the rechargeable battery. The structure to do may be sufficient.

  In the electronic device, the first shape may be a circular shape, and the second shape may be a polygonal shape.

  In the electronic device, the cross-sectional area in the direction perpendicular to the axis of the coil in the first-shaped power-receiving coil is the cross-sectional area in the direction perpendicular to the axis of the coil in the second-shaped power-receiving coil. Different configurations are possible.

  In the electronic device, the region surrounded by the first shape power receiving side coil may overlap the region surrounded by the second shape power receiving side coil.

  In the electronic device, the power receiving side coil is movable in the electronic device, and the control unit selects a coil different from the coil selected as the coil that receives power from the power transmitter from the selected coil. The structure which controls so that it may isolate | separate may be sufficient.

  In order to solve the above-described problem, an electronic device according to the present invention includes an electric power receiving unit that receives electric power transmitted wirelessly from a power transmitter. The electric power receiving unit includes a plurality of power-receiving-side coils having a predetermined shape. A power receiving side coil unit configured by being arranged individually, a selection unit that switches a power supply state of each power reception side coil that constitutes the power reception side coil unit, a control unit that controls the selection unit, and a power supply state by the selection unit A detecting unit that receives power using one or a plurality of power-receiving-side coils that are switched to and detects the received power, and the control unit has the highest power detected by the detecting unit. Or it is the structure which controls the said selection part so that several electric power receiving side coils may be switched to an energized state and electric power may be received.

  In the electronic device, the predetermined shape may be a circular shape or a polygonal shape.

  According to the present invention, high charging efficiency can be realized.

It is a front perspective view which shows the structure of a smart phone. It is a rear view which shows the structure of a smart phone. It is a figure where it uses for description about wireless electric power feeding. It is a figure with which it uses for description about the charging efficiency in the case where the coil shape by the side of a power transmission device differs from the coil shape by the side of a power receiving part. It is a block diagram which shows the 1st structure of a power receiving part. It is a figure which shows the structure of a receiving side coil. It is a figure which shows the circuit structure of a selection part. It is a block diagram which shows the 2nd structure of a receiving part. It is a figure which shows the structure of a receiving side coil part. It is a figure where it uses for description about a coil shape when the energization state of the coil which comprises a receiving side coil part is switched.

  Embodiments for carrying out the present invention will be described in detail with reference to the drawings. Below, a smart phone is demonstrated as an example of an electronic device.

  The external appearance of the smartphone 1 according to the embodiment will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the smartphone 1 has a housing H. The housing H includes a front face 1A, a back face 1B, and side faces 1C1 to 1C4. The front face 1A is the front of the housing H. The back face 1B is the back surface of the housing H. The side faces 1C1 to 1C4 are side surfaces that connect the front face 1A and the back face 1B. Hereinafter, the side faces 1C1 to 1C4 may be collectively referred to as the side face 1C without specifying which face.

  The smartphone 1 includes a touch screen display 2, buttons 3A to 3C, an illuminance sensor 4, a proximity sensor 5, a receiver 6, a microphone 7, and a camera 8 on the front face 1A. The smartphone 1 has a camera 9 on the back face 1B. The smartphone 1 has buttons 3D to 3F and an external interface 10 on the side face 1C. Hereinafter, the buttons 3A to 3F may be collectively referred to as the button 3 without specifying which button.

  The touch screen display 2 includes a display 2A and a touch screen 2B. The display 2A includes a display device such as a liquid crystal display (Liquid Crystal Display), an organic EL panel (Organic Electro-Luminescence panel), or an inorganic EL panel (Inorganic Electro-Luminescence panel). The display 2A displays characters, images, symbols, graphics, and the like.

  The touch screen 2B detects contact of a finger, a stylus pen, or the like with respect to the touch screen display 2. The touch screen 2B can detect a position where a plurality of fingers, a stylus pen, or the like is in contact with the touch screen display 2.

  The detection method of the touch screen 2B may be any method such as a capacitance method, a resistive film method, a surface acoustic wave method (or an ultrasonic method), an infrared method, an electromagnetic induction method, and a load detection method. Hereinafter, for the sake of simplicity of explanation, a finger that the touch screen 2B detects contact with the touch screen display 2 or a stylus pen or the like may be simply referred to as a “finger”.

  The smartphone 1 determines the type of gesture based on the contact, contact position, contact time, or number of contacts detected by the touch screen 2B. The gesture is an operation performed on the touch screen display 2. The gesture discriminated by the smartphone 1 includes touch, long touch, release, swipe, tap, double tap, long tap, drag, flick, pinch in, pinch out, and the like.

  The smartphone 1 operates according to these gestures that are determined via the touch screen 2B. Therefore, operability that is intuitive and easy to use for the user is realized. The operation performed by the smartphone 1 according to the determined gesture differs depending on the screen displayed on the touch screen display 2.

  The button 3 is operated by the user. The button 3 includes buttons 3A to 3F. The operation on the button is, for example, click, double click, push, and multi-push.

  For example, the buttons 3A to 3C are a home button, a back button, or a menu button. For example, the button 3D is a power ON or OFF button of the smartphone 1. The button 3D may also serve as a sleep or sleep release button. For example, the buttons 3E and 3F are volume buttons.

  The illuminance sensor 4 detects illuminance. For example, the illuminance is light intensity, brightness, luminance, or the like. The illuminance sensor 4 is used for adjusting the luminance of the display 2A, for example.

  The proximity sensor 5 detects the presence of a nearby object without contact. The proximity sensor 5 detects that the touch screen display 2 is brought close to the face, for example.

  The receiver 6 outputs an audio signal as audio. The microphone 7 converts the voice of the user or the like into a voice signal. The smartphone 1 may further include a speaker in addition to the receiver 6. The smartphone 1 may further include a speaker instead of the receiver 6.

  The camera 8 is an in camera that captures an object facing the front face 1A. The camera 9 is an out camera that captures an object facing the back face 1B.

  The external interface (connection unit) 14 is a terminal to which another device is connected. The external interface 10 may be a general-purpose terminal such as USB (Universal Serial Bus) (registered trademark) or HDMI (High-Definition Multimedia Interface (registered trademark)). The external interface 10 may be a dedicated terminal such as a dock connector.

  As shown in FIG. 3, the smartphone 1 includes a power receiving unit 21 that receives power transmitted from the power transmitter 100 by a predetermined wireless power feeding method. In other words, the power receiving unit 21 receives magnetic energy sent from the power transmitter 100. Here, as a specific example, when an electromagnetic induction method is taken as an example of the predetermined wireless power feeding method, when an alternating current is passed through a power transmission side coil provided in the power transmitter 100, a magnetic field is generated in the power transmission side coil, and the smartphone 1 An induced voltage is generated in the power receiving side coil provided in the power receiving unit. As a result, power is transmitted from the power transmitter 100 to the smartphone 1. The smartphone 1 stores the power received by the power receiving unit 21 in the built-in rechargeable battery 22. The predetermined power supply method is an electromagnetic induction method, a radio wave reception method, a resonance method, or the like.

  The coupling between the power transmission side coil and the power reception side coil improves as the number of magnetic fluxes reaching the power reception side coil increases. Note that the degree of this coupling is represented by the coupling order. The coupling between the power transmission side coil and the power reception side coil is improved in efficiency when the planar shapes of the coils of the transmitter and the power reception unit match.

Here, if the sizes and shapes of the power transmission side coil and the power reception side coil are different from each other, the following problems may occur.
For example, as shown in FIG. 4, when the sizes of the power transmission side coil and the power reception side coil are different from each other, part of the magnetic flux generated from the power transmission side coil C1 cancels each other, and the power reception side coil C2 and the power transmission side coil are transmitted. The coupling with the side coil C1 becomes weak (the coupling coefficient becomes small). If it does so, the smart phone 1 will obtain only small electric power, and the charge efficiency with respect to the rechargeable battery 22 will worsen. In such a case, the smartphone 1 increases the transmitted power (increases the output of magnetic energy) with respect to the power transmitter (for example, increases the magnitude of the magnetic flux generated from the power transmission side coil). Request.

The power transmitter passes a large current through the power transmission side coil and the power transmission side coil amplifier in accordance with the request. If it does so, a power transmission device will lose energy large, and also the temperature rise by heat_generation | fever of components, such as a power transmission side coil, will generate | occur | produce.
On the other hand, for example, when the smartphone 1 receives power from a power transmitter by an electromagnetic induction method, the smartphone 1 is close to (closely contacted with) the power transmitter. is there.

  Therefore, the smartphone 1 according to the present embodiment proposes a configuration in which the coil shape of the power reception unit 21 is adapted to the coil shape on the power transmitter side.

<First Embodiment>
As shown in FIG. 5, the power reception unit 21 includes a first shape power reception side coil 23, a second shape power reception side coil 24, a selection unit 25, a control unit 26, and a detection unit 27.
The selection unit 25 selects the power receiving side coil 23 having the first shape or the power receiving side coil 24 having the second shape.
The control unit 26 controls the selection unit 25.
The detection unit 27 detects an induced voltage generated by the magnetic flux generated by the power transmission side coil passing through the first shape power reception side coil 23 or the second shape power reception side coil 24. Here, the detection unit 27 may detect power or current based on the induced voltage.

The control unit 26 detects the magnitude of the power detected by the detection unit 27 when switching to the first shape power reception side coil 23 and the detection unit 27 when switching to the second shape power reception side coil 24. The selection unit 25 is controlled so as to compare the magnitude of the electric power and select the power receiving side coil having the higher electric power.
In addition, the smartphone 1 electrically connects the first shape power receiving side coil 23 or the second shape power receiving side coil 24 and the rechargeable battery 22, and controls the selection unit 25 to turn on or off the connection. Specifically, when selecting the first shape of the power receiving side coil 23, the selection unit 25 turns on the electrical connection between the first shape of the power receiving side coil 23 and the rechargeable battery 22 and the second shape of the power receiving side coil 23. When the electrical connection between the power receiving side coil 24 and the rechargeable battery 22 is turned off and the second shape power receiving side coil 24 is selected, the second shape power receiving side coil 24 and the rechargeable battery 22 are electrically connected. While turning on, the electrical connection between the first-shaped power receiving coil 23 and the rechargeable battery 22 is turned off.

  Here, the magnitude of the power detected by the detection unit 27 when switching to the first shape power receiving side coil 23 and the power detected by the detection unit 27 when switching to the second shape power receiving side coil 24 are described. For example, when the power of the first shape of the power receiving side coil 23 becomes larger when compared with the size, the power of the first shape of the power receiving side coil 23 is higher than that of the second shape of the power receiving side coil 24. It can be said that it is close to the shape and size of the coil on the side. That is, it can be said that the smartphone 1 can achieve high charging efficiency when wireless power feeding is performed using the first shape power receiving side coil 23.

  According to such a configuration, since the smartphone 1 performs wireless power feeding using a coil having a size and shape close to those of the coil on the power transmitter side, high charging efficiency can be realized.

The first shape of the power receiving side coil 23 has a circular shape, and the second shape of the power receiving side coil 24 has a polygonal shape.
Further, the area surrounded by the first shape power receiving side coil 23 (that is, the cross-sectional area of the first shape power receiving side coil 23 in the direction perpendicular to the axis of the coil), and the second shape power receiving side coil The area surrounded by 24 (the cross-sectional area in the direction perpendicular to the axis of the coil of the second-shaped power receiving side coil) may be different.
For example, the first shape of the power receiving side coil 23 that is a circular coil and the second shape of the power receiving side coil 24 that is a rectangular coil are configured to be affixed doubly as shown in FIG. In FIG. 6, the first shape of the power receiving side coil 23 is shown as being smaller than the second shape of the power receiving side coil 24, but is not limited thereto, and is larger than the second shape of the power receiving side coil 24. May be.
The first shape power receiving side coil 23 may be configured to be completely surrounded by the second shape power receiving side coil 24. That is, the first shape power receiving side coil 23 may be sized to be accommodated in the region inside the second shape power receiving side coil 24.

According to such a configuration, the smartphone 1 can receive power with a coil having a size matching the area surrounded by the coil on the power transmitter 100 side, and can realize high charging efficiency.
Further, the first shape power receiving side coil 23 or the second shape power receiving side coil 24 may be configured to be movable in the smartphone 1 so as to be separated from each other. Specifically, when the first shape power receiving side coil 23 is selected as the coil that receives power from the power transmitter, the control unit 26 replaces the second shape power receiving side coil 24 with the first shape power receiving side coil 23. Control away from the remote. Accordingly, when the smartphone 1 selects the first shape of the power receiving side coil 23, the second shape of the power receiving side coil 24 prevents the first shape of the power receiving side coil 23 from receiving magnetic energy. be able to.

Further, as shown in FIG. 6, the region surrounded by the first shape power receiving side coil 23 may overlap the region surrounded by the second shape power receiving side coil 24.
According to such a configuration, the smartphone 1 can effectively utilize the space in the housing.

Next, a specific circuit configuration of the selection unit 25 that switches between the first shape power receiving side coil 23 and the second shape power receiving side coil 24 will be described with reference to FIG. 7.
The selection unit 25 includes a plurality of switches, and selects the first shape power reception side coil 23 or the second shape power reception side coil 24 by switching the switches.

Each coil is formed by winding a wire rod into a circular shape or a square shape in a spiral shape.
Each switch may be provided, for example, every round. In such a configuration, when only the switch on the inner peripheral side is turned on and the other switches are turned off, a small circular or small rectangular coil can be formed. Further, when only the switch on the outer peripheral side is turned on and the other switches are turned off, a large circular or large rectangular coil can be formed.

  In this way, the smartphone 1 not only switches between the first shape of the power receiving side coil 23 and the second shape of the power receiving side coil 24, but also the first shape of the power receiving side coil 23 and the second shape of the power receiving side coil 24. Since the size of the coil can be freely changed, a coil having a size adapted to the shape of the coil on the power transmission device 100 side can be formed, and higher charging efficiency can be realized.

  Further, in the conventional configuration, intermediate performance has been realized uniformly by selecting the coil shape. On the other hand, since the smartphone 1 can form a coil shape suitable for the coil shape on the power transmitter 100 side, the connection with the coil becomes strong, and as a result, efficient wireless charging can be performed.

  Moreover, since the power transmitter 100 does not transmit power with unnecessary large electric power (generates magnetic energy), heat generation can be suppressed. Therefore, even if the smartphone 1 is brought close to (closely attached to) the power transmitter 100 when performing wireless power feeding, the increase in temperature can be suppressed.

  In the above description, the smartphone 1 has been described as performing wireless power feeding using either the first shape power receiving side coil 23 or the second shape power receiving side coil 24, but is not limited thereto. Wireless power feeding may be performed by using both the one-shaped power-receiving side coil 23 and the second-shaped power-receiving side coil 24 simultaneously. According to such a configuration, the smartphone 1 can charge the rechargeable battery 22 with twice the power because the power feeding efficiency is about twice.

Second Embodiment
As shown in FIG. 8, the power reception unit 21 includes a power reception side coil unit 31, a selection unit 32, a control unit 33, and a detection unit 34.
The power receiving side coil unit 31 is configured by arranging a plurality of power receiving side coils having a predetermined shape. For example, as illustrated in FIG. 9, the power receiving side coil unit 31 includes a plurality of coils (C01 to C12) arranged in a tile shape.
The selection unit 32 switches the energization state of each power reception side coil constituting the power reception side coil unit 31.
The control unit 33 controls the selection unit 32.

The detection unit 34 detects the electric power received using one or a plurality of power receiving coils that are switched to the energized state by the selection unit 32.
The control unit 33 controls the selection unit 32 so as to receive power by switching one or a plurality of power receiving coils where the power detected by the detection unit 34 is maximized to an energized state. The detection unit 34 may detect voltage or current instead of electric power.

  For example, as shown in FIG. 10A, the smartphone 1 switches all twelve coils to the energized state with respect to the power receiving side coil unit 31, and if an electric current flows clockwise in each coil, an inner loop Then, since the magnetic fields cancel each other, a coil C1 having a large outermost periphery can be formed.

  In addition, for example, as illustrated in FIG. 10B, the smartphone 1 switches any three coils to the energized state with respect to the power receiving side coil unit 31, and flows current clockwise through each coil. A coil C2 having a predetermined size can be formed.

  According to such a configuration, when the smartphone 1 performs wireless power feeding, by sequentially switching the energization state of the coil of the power receiving side coil unit 31, the coil shape having a close size and shape of the coil on the power transmitter side can be obtained. Since it can form, high charging efficiency is realizable.

  Further, in the conventional configuration, intermediate performance has been realized uniformly by selecting the coil shape. On the other hand, since the smartphone 1 can form a coil shape suitable for the coil shape on the power transmitter 100 side, the connection with the coil becomes strong, and as a result, efficient wireless charging can be performed.

  Moreover, since the power transmitter 100 does not transmit power with unnecessary large electric power (generates magnetic energy), heat generation can be suppressed. Therefore, even if the smartphone 1 is brought close to (closely attached to) the power transmitter 100 when performing wireless power feeding, the increase in temperature can be suppressed.

  In the example illustrated in FIG. 9, the coil shape of the power receiving side coil unit 31 is a quadrangular shape, but is not limited thereto, and may be a polygonal shape or a circular shape other than the quadrangular shape.

  In addition, the smartphone 1 receives information on the coil shape of the power transmitter in advance by wireless communication (short-range wireless communication, etc.), and controls the energization state of the coils constituting the power receiving side coil unit 31 based on the information. A configuration in which the coil shape of the power receiving side coil unit 31 is approximated to the coil shape of the power transmitter may be used. According to such a configuration, the smartphone 1 can bring the coil shape of the power receiving side coil unit 31 close to the coil shape of the power transmitter in a short time.

Moreover, the following structures can be considered as a method of energizing the coil constituting the power receiving side coil unit 31.
The smartphone 1 energizes the adjacent coils sequentially from the coil at the end (for example, the coil C01 in FIG. 9) among the coils constituting the power receiving side coil unit 31, and is predetermined by some coil. It is determined whether or not the above power can be received. Since only one coil is energized, when the adjacent coil is energized, the previous coil is de-energized.

Here, it is assumed that, for example, when the coil C03 is energized, it can receive more than a predetermined amount of power. The smartphone 1 may be configured to switch a coil near the coil C03 (for example, the coil C02, the coil C05, and the coil C06 in FIG. 9) to an energized state.
According to such a configuration, the smartphone 1 can efficiently bring the coil shape of the power receiving side coil unit 31 close to the coil shape of the power transmitter.

DESCRIPTION OF SYMBOLS 1 Smartphone 21 Power receiving part 22 Rechargeable battery 23 1st shape power receiving side coil 24 2nd shape power receiving side coil 25, 32 Selection part 26, 33 Control part 27, 34 Detection part 31 Power receiving side coil part

Claims (8)

In an electronic device including a power receiving unit that receives power transmitted wirelessly from a power transmitter,
The power receiving unit
A power receiving side coil of a first shape;
A second shape power receiving coil;
As a coil that receives power transmitted from the power transmitter, a selection unit that selects the power receiving side coil of the first shape or the power receiving side coil of the second shape;
A control unit,
The control unit compares the magnitude of the power received by the first shape of the power receiving side coil with the magnitude of the power received by the second shape of the power receiving side coil. Choose electronic equipment. A rechargeable battery that is electrically connected to the first shape of the power receiving side coil or the second shape of the power receiving side coil;
Selecting the first shape power receiving side coil means electrically connecting the first shape power receiving side coil and the rechargeable battery, and selecting the second shape power receiving side coil means that The electronic device according to claim 1, wherein the second shape power receiving side coil and the rechargeable battery are electrically connected. The first shape is a circular shape,
The electronic device according to claim 1, wherein the second shape is a polygonal shape.   The cross-sectional area in the direction perpendicular to the axis of the coil of the first-shaped power-receiving coil is different from the cross-sectional area in the direction perpendicular to the axis of the coil of the second-shaped power-receiving coil. 4. The electronic device according to any one of items 1 to 3.   5. The electronic apparatus according to claim 1, wherein a region surrounded by the first shape power receiving side coil overlaps a region surrounded by the second shape power receiving side coil. 6. The power receiving coil is movable in the electronic device,
The electronic device according to claim 1, wherein the control unit controls a coil different from a coil selected as a coil that receives power from the power transmitter so as to be separated from the selected coil. In an electronic device including a power receiving unit that receives power transmitted wirelessly from a power transmitter,
The power receiving unit
A power receiving side coil portion configured by arranging a plurality of power receiving side coils of a predetermined shape;
A selection unit that switches the energization state of each power reception side coil that constitutes the power reception side coil unit;
A control unit for controlling the selection unit;
A detector that receives power using one or a plurality of power receiving coils that are switched to an energized state by the selector, and detects the received power;
The said control part is an electronic device which controls the said selection part so that the electric power detected by the said detection part may switch the energized state or the one or some receiving side coil to receive electric power.   The electronic device according to claim 7, wherein the predetermined shape is a circular shape or a polygonal shape.

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