WO2013047260A1

WO2013047260A1 - Apparatus having built-in battery with charging stand, and apparatus having built-in battery

Info

Publication number: WO2013047260A1
Application number: PCT/JP2012/073771
Authority: WO
Inventors: 定男南; 靖博飯嶋; 淳士本田
Original assignee: 三洋電機株式会社
Priority date: 2011-09-29
Filing date: 2012-09-18
Publication date: 2013-04-04
Also published as: JP2014239560A

Abstract

[Problem] According to the present invention, a simple circuit structure is used to detect a foreign body placed on a charging stand and transmit power efficiently from a transmission coil to a reception coil. [Solution] An apparatus having a built-in battery, and a charging stand, according to the present invention charge a built-in battery (52) by transmitting power from a transmission coil (11) of a charging stand (10) to a reception coil (51) of an apparatus (50) having a built-in battery. The apparatus (50) having a built-in battery comprises a temperature sensor (64) which detects a temperature of a case (60), a foreign body detection circuit (65) which detects a foreign body based on the temperature sensed by the temperature sensor (64), and a transmission circuit (66) which transmits a detection signal to the charging stand (10). The charging stand (10) comprises a detection signal detection unit (17) which detects the detection signal transmitted from the transmission circuit (66), and a control circuit (18) which controls power of the transmission coil (11). In a state where the foreign body detection circuit (65) of the apparatus (50) having a built-in battery detects the foreign body, the apparatus having a built-in battery and the charging stand transmit the detection signal from the apparatus (50) having a built-in battery to the charging stand (10), and controls power which is supplied from the control circuit (18) to the transmission coil (11) by the charging stand (10).

Description

Battery built-in device and charging stand, and battery built-in device

The present invention relates to a battery built-in device and a charging stand for charging a built-in battery of the battery built-in device by setting the battery built-in device on the charging stand, transferring power from the charging stand to the battery built-in device by magnetic induction.

A charging stand and a battery built-in device have been developed in which a battery built-in device is mounted on a charging stand and power is transferred from the charging stand to the battery built-in device by magnetic induction to charge the built-in battery of the battery built-in device. (See Patent Document 1)

This charging stand has a power transmission coil, and the battery built-in device has a power receiving coil and a built-in battery. When a battery built-in device is set on the charging base so that the power transmission coil and power receiving coil of the charging base are electromagnetically coupled, power is transferred from the power transmission coil to the power receiving coil, and the internal battery is charged by the power induced by the power receiving coil. Is done. With this structure, it is not necessary to connect the battery built-in device to the charging stand via the connector, and the built-in battery can be conveniently charged in a non-contact manner.

In the charging stand of this structure, when a foreign object such as a metal piece is placed together with a battery built-in device, a dielectric current flows through the foreign object to generate heat, and the heat generation causes various harmful effects. For example, a foreign object heats the battery of a battery built-in apparatus, or heats the upper surface of a charging stand, and inhibits safe charge. In order to eliminate this drawback, the charging base of Patent Document 1 has a large number of temperature sensors arranged vertically and horizontally on the upper surface. The temperature sensor is placed on the charging stand and detects that the foreign matter generates heat. In this charging stand, when AC power is supplied to the power transmission coil with a metal foreign object placed thereon, a dielectric current flows through the foreign object to generate heat, so the heat generated by this foreign object is placed nearby. Detect with.

JP 2008-17562 A

In the above charging stand, it is not possible to specify where the foreign object is set on the upper surface, so it is necessary to arrange a large number of temperature sensors on the upper surface of the mounting table. For this reason, the number of temperature sensors increases and component cost becomes high. In addition, since it is not specified which temperature sensor detects heat generation depending on the position where the foreign object is placed, it is necessary to determine that the foreign object has been placed from the detection temperatures of all temperature sensors provided in large numbers, The detection circuit for detecting that a foreign object is placed from the detection temperatures of a large number of temperature sensors is also complicated, and there is a disadvantage that the foreign object cannot be detected with a simple circuit.

Furthermore, since this charging stand arranges many temperature sensors on the stand on which the battery built-in device is placed, the temperature sensor and the parts on which the temperature sensor is placed are located between the power transmission coil and the power receiving coil. There is also a drawback that the distance between the coils is widened to deteriorate the power transfer efficiency. Since the power transmitting coil and the power receiving coil are electromagnetically coupled to carry power, it is important to make them closer to each other and narrow the distance in order to carry power more efficiently. However, the structure in which the temperature sensor is disposed between the power transmission coil and the power reception coil has a drawback in that the power transmission coil and the power reception coil are brought close to each other and the interval cannot be reduced, thereby reducing the power transfer efficiency.

The present invention was developed for the purpose of solving the above drawbacks. An important object of the present invention is to detect foreign matter placed at all positions on the charging stand without providing a large number of temperature sensors, and to detect foreign matter with a very simple circuit configuration. It is to provide a battery built-in device, a charging stand, and a battery built-in device that can be charged while efficiently conveying power.

Means for Solving the Problems and Effects of the Invention

The battery built-in device and the charging stand according to the present invention include the charging stand 10 including the power transmission coil 11 and the battery built-in device 50 including the power receiving coil 51 electromagnetically coupled to the power transmission coil 11 in the case 60. The built-in battery 52 of the battery built-in device 50 is charged with the power conveyed from the coil 11 to the power receiving coil 51. The battery built-in device 50 includes a temperature sensor 64 that detects the temperature in the case 60, a foreign object detection circuit 65 that detects that a foreign object is placed on the charging stand 10 from the temperature detected by the temperature sensor 64, and the foreign object detection circuit. A transmission circuit 66 that transmits a detection signal to the charging stand 10 in a state in which 65 detects a foreign object. The charging stand 10 has a detection signal detection unit 17 that detects a detection signal transmitted from the transmission circuit 66, and a control that controls the power supplied to the power transmission coil 11 in a state in which the detection signal detection unit 17 detects the detection signal. And a circuit 18. The battery built-in device and the charging stand transmit a detection signal from the battery built-in device 50 to the charging stand 10 in a state where the foreign matter detection circuit 65 of the battery built-in device 50 detects the foreign matter, and the charging stand 10 transmits power through the control circuit 18. The electric power supplied to the coil 11 is controlled.

The battery built-in device and the charging stand described above can detect foreign matters placed on the charging stand with an extremely simple circuit configuration, and can be charged while efficiently transferring power from the power transmission coil to the power receiving coil. The battery built-in device detects that a foreign object has been placed on the charging stand from the detection temperature of the temperature sensor provided in the case, and transmits a detection signal from the battery built-in device to the charging stand. This is because the charging stand detects this detection signal and controls the power supplied to the power transmission coil by the control circuit. The above structure detects foreign matter on the charging stand from the detection temperature of the temperature sensor provided in the case of the battery built-in device, so that the charging stand is not provided on the upper surface of the charging stand as in the prior art. It is possible to detect foreign objects placed at all positions. Moreover, since a foreign object can be detected without providing a temperature sensor on the upper surface of the charging stand, charging can be performed while efficiently transferring power from the power transmission coil to the power reception coil without increasing the distance between the power transmission coil and the power reception coil.

In the battery built-in device and the charging stand according to the present invention, the foreign object detection circuit 65 can detect the foreign object from any one of the temperature difference of the temperature detected by the temperature sensor 64, the temperature gradient, and the threshold value at a predetermined time.

The battery built-in device and the charging stand according to the present invention include a memory 67 in which the foreign matter detection circuit 65 stores a temperature rise in a normal state where no foreign matter is placed on the charging stand 10 as a lookup table or a function. The foreign matter can be detected by comparing the detected temperature rise with the temperature detected by the temperature sensor 64.

In the battery built-in device and the charging stand according to the present invention, the foreign object detection circuit 65 is connected to the temperature sensor 64 during the detection time in which the control circuit 18 increases the power supplied to the power transmission coil 11 from the initial initial charging timing at which charging is started. Foreign matter can be detected at the detected temperature.

In the battery built-in device and the charging stand according to the present invention, the foreign matter detection circuit 65 is connected to the temperature sensor 64 during the detection time in which the control circuit 18 reduces the power supplied to the power transmission coil 11 from the initial initial charging timing at which charging is started. Foreign matter can be detected at the detected temperature.

In the battery built-in device and the charging stand according to the present invention, the control circuit 18 supplies constant power to the power transmission coil 11, and the foreign matter detection circuit 65 can detect foreign matter at the temperature detected by the temperature sensor 64.

In the battery built-in device and the charging stand of the present invention, the control circuit 18 stores the charging time and power at the initial charging timing when the power is supplied to the power transmission coil 11 at the beginning of charging, and the charging time and power of the detection time. A memory 28 may be provided.

In the battery built-in device and the charging stand according to the present invention, the power supplied to the power transmission coil 11 can be used to charge the built-in battery 52 of the battery built-in device 50 with a specified current during the detection time.

The battery built-in device and the charging stand according to the present invention can limit the power supplied from the control circuit 18 to the power transmission coil 11 in a state where the foreign matter detection circuit 65 detects the foreign matter.

The battery built-in device and the charging stand according to the present invention include a circuit board 62 on which the battery built-in device 50 mounts a charging circuit that charges the built-in battery 52 with AC power induced by the power receiving coil 51, and includes a temperature sensor 64. A temperature sensor for detecting the temperature of the circuit board 62 can be used.

In the battery built-in device and the charging stand according to the present invention, the battery built-in device 50 includes a battery temperature sensor 68 for detecting the temperature of the built-in battery 52 and a temperature sensor 64 for the circuit board 62 for detecting the temperature of the circuit board 62. Can be provided.

In the battery built-in device of the present invention, a power receiving coil 51 that is electromagnetically coupled to the power transmission coil 11 of the charging stand 10 is built in the case 60, and the built-in battery is powered by the power that is transferred from the power transmission coil 11 to the power receiving coil 51. 52 is charged. The battery built-in device includes a temperature sensor 64 that detects the temperature in the case 60, a foreign object detection circuit 65 that detects that a foreign object has been placed on the charging base 10 from the temperature detected by the temperature sensor 64, and the foreign object detection circuit 65. Includes a transmission circuit 86 that transmits a detection signal to the charging base 10 in a state in which the foreign object is detected, and the transmission circuit 66 transmits the detection signal to the charging base 10 in a state in which the foreign object detection circuit 65 detects the foreign object. To do.
The battery built-in device described above has a feature that it can detect a foreign object placed on the charging stand with an extremely simple circuit configuration and transmit this to the charging stand. This is because the battery built-in device detects from the detection temperature of the temperature sensor provided in the case that a foreign object has been placed on the charging stand with the foreign object detection circuit, and the transmission circuit transmits the detection signal to the charging stand. is there.

It is a perspective view of the battery built-in apparatus and charging stand concerning one Example of this invention. It is a schematic block diagram of the charging stand shown in FIG. It is a vertical longitudinal cross-sectional view of the charging stand shown in FIG. It is a vertical cross-sectional view of the charging stand shown in FIG. It is a vertical cross-sectional view of the battery built-in apparatus shown in FIG. It is a disassembled perspective view of the battery built-in apparatus shown in FIG. It is a block diagram of the battery built-in apparatus and charging stand concerning one Example of this invention. It is a block diagram which shows an example of the position detection controller of a charging stand. It is a figure which shows an example of the echo signal output from the receiving coil excited with the position detection signal. It is a graph which shows the relationship between the electric power supplied to the power transmission coil, and detection temperature in detection time. It is a graph which shows another example of the relationship between the power supplied to the power transmission coil and the detected temperature during the detection time. It is a graph which shows another example of the relationship between the power supplied to the power transmission coil and the detected temperature during the detection time. It is a flowchart in which a foreign material detection circuit detects a foreign material. It is a graph which shows the relationship between the electric power supplied to the power transmission coil in the flowchart shown in FIG. 13, and detected temperature.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the examples shown below illustrate the battery built-in device and the charging stand and the battery built-in device for embodying the technical idea of the present invention, and the present invention includes the battery built-in device and the charging stand, and The battery built-in equipment is not specified as follows. Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

The battery built-in device and the charging stand shown in FIGS. 1 to 7 place the battery built-in device 50 on the charging stand 10 and charge the built-in battery 52 of the battery built-in device 50 by magnetic induction. The battery built-in device 50 includes a power receiving coil 51 that is electromagnetically coupled to the power transmitting coil 11. Furthermore, the battery built-in device 50 has a built-in battery 52 that is charged by the power induced in the power receiving coil 51. The battery built-in device 50 is a portable device provided with a built-in battery 52, and includes a built-in battery 52 such as a battery charger that charges the built-in battery 52 of a portable device such as a pack battery, a mobile phone, and a mobile phone. It is a portable device provided.

In the battery built-in device 50 shown in the figure, two built-in batteries 52 are provided in a case 60, and a circuit board 62 is disposed between the two built-in batteries 52. The circuit board 62 is disposed at a fixed position in the case 60 via the insulating holder 63, and the built-in battery 52 is also disposed at a fixed position in the case 60.

The circuit board 62 includes a rectifier circuit 53 that converts alternating current output from the power receiving coil 51 into direct current, a charge control circuit 54 that charges the built-in battery 52 with direct current output from the rectifier circuit 53, and a temperature in the case 60. A temperature sensor 64 for detecting a foreign matter, a foreign matter detection circuit 65 for detecting that a foreign matter has been placed on the charging base 10 from the temperature detected by the temperature sensor 64, and a detection signal in a state where the foreign matter detection circuit 65 detects the foreign matter. Is mounted with an electronic component that realizes a transmission circuit 66 that transmits the signal to the charging stand 10. In the battery-equipped device 50 shown in FIGS. 5 and 6, the temperature sensor 64 of the circuit board 62 that detects the temperature in the case 60 is fixed to the surface of the circuit board 62.

Further, the circuit board 62 is mounted with a battery temperature sensor 68 for detecting the temperature of the built-in battery 52 and a battery temperature detection circuit 69 connected to the temperature sensor 68. As shown in the cross-sectional view of FIG. 5, the battery temperature sensor 68 has the temperature sensing portion 68A approaching or contacting the internal battery 52, and soldering the end of the lead wire 68B to the circuit board 62. The battery temperature detecting circuit 69 mounted on the circuit board 62 is connected. The battery temperature detection circuit 69 transmits a charge stop signal for stopping charging to the charging stand 10 via the transmission circuit 66 when the battery temperature becomes equal to or higher than a maximum temperature (for example, 55 ° C.) that allows charging. The charging stand 10 detects this charging stop signal, stops the power supply to the power transmission coil 11, and stops the charging of the built-in battery 52. When the temperature of the built-in battery 52 decreases to a temperature at which charging can be resumed, the battery temperature detection circuit 69 transmits a charge restart signal to the charging base 10 via the transmission circuit 66. When the charging stand 10 detects this charging restart signal, the charging stand 10 supplies AC power to the power transmission coil 11 to restart charging of the internal battery 52.

The built-in battery 52 is a lithium ion battery or a lithium polymer battery. However, the built-in battery can be any rechargeable battery such as a nickel metal hydride battery or a nickel cadmium battery. The battery built-in device 50 shown in FIGS. 5 to 7 has two built-in batteries 52 connected in parallel. However, the battery built-in device can include one or three or more built-in batteries, and the plurality of built-in batteries can be connected in series or in series and parallel.

The rectifier circuit 53 includes a diode bridge 53A that rectifies the alternating current induced in the power receiving coil 51, and a smoothing capacitor 53B that smoothes the pulsating current that has been full-wave rectified by the diode bridge 53A. The rectifier circuit 53 shown in FIG. 7 rectifies alternating current using a diode bridge 53A. However, a synchronous rectifier circuit that connects an FET to the bridge and switches the FET on and off in synchronization with the alternating current can be used for the rectifier circuit. . The FET synchronous rectifier circuit has a low on-resistance, reduces heat generation in the rectifier circuit, and can reduce the rise in the temperature of the case of the battery built-in device.

The charge control circuit 54 charges the built-in battery 52 with constant voltage / constant current characteristics in the battery built-in device 50 in which the built-in battery 52 is a lithium ion battery or a lithium polymer battery. A battery built-in device in which the built-in battery is a nickel metal hydride battery or a nickel cadmium battery charges the built-in battery at a constant current with a charge control circuit. Further, the charging control circuit 54 detects the full charge of the built-in battery 52 and transmits a full charge signal to the charging stand 10 via the transmission circuit 66.

A charging stand 10 shown in FIGS. 1 to 4 and 7 includes a power transmission coil 11 that is connected to an AC power source 12 and induces an electromotive force in a power receiving coil 51, and includes a power transmission coil 11 and a battery on the upper surface. A case 20 having a top plate 21 on which the built-in device 50 is placed, a detection signal detection unit 17 that is built in the case 20 and detects a detection signal transmitted from the transmission circuit 66 of the battery built-in device 50, and the detection signal detection The control circuit 18 which controls the electric power supplied to the power transmission coil 11 in the state which the part 17 detects a detection signal is provided. The control circuit 18 controls the AC power supply 12 that supplies AC power to the power transmission coil 11 to control power supply to the power receiving coil 51.

The charging stand 10 electromagnetically couples the power transmission coil 11 to the power receiving coil 51 and carries power from the power receiving coil 51 to the power receiving coil 51. The charging base 10 that charges the internal battery 52 by setting the battery-incorporated device 50 at a free position on the top plate 21 has an approach mechanism 19 for the power transmission coil 11 that moves the power transmission coil 11 to approach the power reception coil 51. Prepare. The approach mechanism 19 detects the position of the moving mechanism 13 that moves the power receiving coil 51 along the inner surface of the upper surface plate 21 and the battery built-in device 50 that is placed on the upper surface plate 21, and controls the moving mechanism 13 to transmit the power transmitting coil. 11 and the position detection controller 14 which makes the power receiving coil 51 of the battery built-in apparatus 50 approach. The charging stand 10 includes a power transmission coil 11, an AC power source 12, a moving mechanism 13, and a position detection controller 14 in a case 20. However, the charging stand that charges the built-in battery by setting the battery built-in device in a fixed position does not need to move the power transmission coil so as to approach the power reception coil. Therefore, this charging stand does not need to be provided with a power receiving coil approach mechanism.

The charging stand 10 including the approach mechanism 19 charges the built-in battery 52 of the battery built-in device 50 by the following operation.
(1) When the battery built-in device 50 is placed on the upper surface plate 21 of the case 20, the position detection controller 14 detects the position of the battery built-in device 50.
(2) The position detection controller 14 that has detected the position of the battery built-in device 50 controls the moving mechanism 13 to move the power transmission coil 11 along the upper surface plate 21 with the moving mechanism 13, thereby Approach the power receiving coil 51.
(3) The power transmission coil 11 approaching the power reception coil 51 is electromagnetically coupled to the power reception coil 51 and carries AC power to the power reception coil 51.
(4) The battery built-in device 50 rectifies the AC power of the power receiving coil 51 and converts it into direct current, and charges the built-in battery 52 with this direct current.

The charging stand 10 that charges the built-in battery 52 of the battery built-in device 50 by the above operation has the power transmission coil 11 connected to the AC power supply 12 built in the case 20. The power transmission coil 11 is disposed under the upper surface plate 21 of the case 20 so as to move along the upper surface plate 21. The efficiency of power transfer from the power transmission coil 11 to the power reception coil 51 can be improved by narrowing the interval between the power transmission coil 11 and the power reception coil 51. Therefore, the power transmission coil 11 is disposed below the top plate 21 and as close to the top plate 21 as possible. Since the power transmission coil 11 moves so as to approach the power reception coil 51 of the battery built-in device 50 placed on the upper surface plate 21, the power transmission coil 11 is disposed so as to be movable along the lower surface of the upper surface plate 21.

The case 20 containing the power transmission coil 11 is provided with a flat top plate 21 on which the battery built-in device 50 is placed on the top surface. The charging stand 10 shown in the figure is disposed horizontally with the entire top plate 21 as a flat surface. The top plate 21 has such a size that various battery built-in devices 50 having different sizes and external shapes can be placed thereon.

The power transmission coil 11 is wound in a spiral shape on a surface parallel to the upper surface plate 21 and radiates an alternating magnetic flux above the upper surface plate 21. The power transmission coil 11 radiates an alternating magnetic flux orthogonal to the upper surface plate 21 above the upper surface plate 21. The power transmission coil 11 is supplied with AC power from the AC power source 12 and radiates AC magnetic flux above the upper surface plate 21. The power transmission coil 11 can increase the inductance by winding a wire around a core 15 made of a magnetic material. The core 15 is made of a magnetic material such as ferrite having a high magnetic permeability, and has a bowl shape that opens upward. The bowl-shaped core 15 has a shape in which a columnar portion 15A disposed at the center of a power transmission coil 11 wound in a spiral shape and a cylindrical portion 15B disposed on the outside are connected at the bottom. The power transmission coil 11 having the core 15 can concentrate the magnetic flux to a specific portion and efficiently transmit power to the power reception coil 51. However, the power transmission coil does not necessarily need to be provided with a core, and may be an air-core coil. Since the air-core coil is light, a moving mechanism for moving it on the inner surface of the upper plate can be simplified. The power transmission coil 11 is substantially equal to the outer diameter of the power reception coil 51 and efficiently conveys power to the power reception coil 51.

The AC power supply 12 supplies, for example, high frequency power of 20 kHz to 1 MHz to the power transmission coil 11. The AC power supply 12 is connected to the power transmission coil 11 via a flexible lead wire 16. This is because the power transmission coil 11 is moved so as to approach the power reception coil 51 of the battery built-in device 50 placed on the upper surface plate 21. The AC power supply 12 includes an oscillation circuit and a power amplifier that amplifies the AC output from the oscillation circuit.

The power transmission coil 11 is moved by the moving mechanism 13 so as to approach the power reception coil 51. The moving mechanism 13 in FIGS. 1 to 4 moves the power transmission coil 11 along the upper surface plate 21 in the X-axis direction and the Y-axis direction to approach the power receiving coil 51. The moving mechanism 13 shown in the figure rotates the screw rod 23 by the servo motor 22 controlled by the position detection controller 14 to move the nut member 24 screwed into the screw rod 23, and the power transmission coil 11 is moved to the power receiving coil 51. To approach. The servo motor 22 includes an X-axis servo motor 22A that moves the power transmission coil 11 in the X-axis direction, and a Y-axis servo motor 22B that moves the Y-axis direction. The screw rod 23 includes a pair of X-axis screw rods 23A that move the power transmission coil 11 in the X-axis direction, and a Y-axis screw rod 23B that moves the power transmission coil 11 in the Y-axis direction. The pair of X-axis screw rods 23A are arranged in parallel to each other, driven by the belt 25, and rotated together by the X-axis servomotor 22A. The nut member 24 includes a pair of X-axis nut members 24A screwed into the respective X-axis screw rods 23A, and a Y-axis nut member 24B screwed into the Y-axis screw rods 23B. The Y-axis screw rod 23B is coupled so that both ends thereof can be rotated to a pair of X-axis nut members 24A. The power transmission coil 11 is connected to the Y-axis nut member 24B.

Furthermore, the moving mechanism 13 shown in the figure has a guide rod 26 disposed in parallel with the Y-axis screw rod 23B in order to move the power transmission coil 11 in the Y-axis direction in a horizontal posture. Both ends of the guide rod 26 are connected to the pair of X-axis nut members 24A and move together with the pair of X-axis nut members 24A. The guide rod 26 penetrates the guide portion 27 coupled to the power transmission coil 11 so that the power transmission coil 11 can be moved along the guide rod 26 in the Y-axis direction. That is, the power transmission coil 11 moves in the Y-axis direction in a horizontal posture via the Y-axis nut member 24 </ b> B and the guide portion 27 that move along the Y-axis screw rod 23 </ b> B and the guide rod 26 arranged in parallel to each other. To do.

In the moving mechanism 13, when the X-axis servo motor 22A rotates the X-axis screw rod 23A, the pair of X-axis nut members 24A move along the X-axis screw rod 23A, and the Y-axis screw rod 23B and the guide rod 26 is moved in the X-axis direction. When the Y-axis servo motor 22B rotates the Y-axis screw rod 23B, the Y-axis nut member 24B moves along the Y-axis screw rod 23B, and moves the power transmission coil 11 in the Y-axis direction. At this time, the guide part 27 connected to the power transmission coil 11 moves along the guide rod 26 to move the power transmission coil 11 in the Y-axis direction in a horizontal posture. Therefore, the rotation of the X-axis servomotor 22A and the Y-axis servomotor 22B can be controlled by the position detection controller 14, and the power transmission coil 11 can be moved in the X-axis direction and the Y-axis direction. However, the charging stand 10 of the present invention does not specify the moving mechanism as the above mechanism. This is because any mechanism that can move the power transmission coil 11 in the X-axis direction and the Y-axis direction can be used as the moving mechanism. The transfer mechanism can also make the power transmission coil 11 approach the power reception coil 51 without using a mechanism that moves the power transmission coil 11 in the X-axis direction and the Y-axis direction.

The position detection controller 14 detects the position of the power receiving coil 51 built in the battery built-in device 50 placed on the top plate 21. FIG. 8 shows a block diagram of the position detection controller 14. The position detection controller 14 includes a plurality of position detection coils 30 fixed inside the upper surface plate 21 of the case 20 of the charging base 10, and a detection signal generation circuit 31 that supplies a position detection signal to the position detection coil 30. A reception circuit 32 that receives an echo signal that is excited by the position detection signal supplied from the detection signal generation circuit 31 to the position detection coil 30 and is output from the power reception coil 51 to the position detection coil 30; And an identification circuit 33 for determining the position of the power receiving coil 51 from the received echo signal. Further, the position detection controller 14 shown in the figure is controlled by the identification circuit 33 to switch the plurality of position detection coils 30 in order, and the position detection signal input from the detection signal generation circuit 31 to the reception circuit 32. And a limiter circuit 35 that inputs the signal level to the receiving circuit 32.

The above position detection controller 14 detects the position of the power receiving coil 51 as follows.
(1) The detection signal generation circuit 31 outputs a position detection signal of the pulse signal to the position detection coil 30.
(2) Excited by the pulse signal of the position detection signal supplied to the position detection coil 30, an echo signal is output from the power receiving coil 51 to the position detection coil 30, as shown in FIG.
(3) The echo signal is received by the receiving circuit 32.
(4) A plurality of position detection coils 30 are sequentially switched by the switching circuit 34 to output a position detection signal of a pulse signal from each position detection coil 30, and an echo signal is received by each position detection coil 30.
(5) The identification circuit 33 detects the level of the echo signal induced in each position detection coil 30 to detect the position of the power receiving coil 51. The echo signal induced in the position detection coil 30 approaching the power receiving coil 51 has a high level, and the level of the echo signal decreases as the power receiving coil 51 moves away from the position detection coil 30, so that the identification circuit 33 determines the level of the echo signal. From this, the position of the power receiving coil 51 is detected. The position detection controller 14 in FIG. 8 is provided with position detection coils 30 in the X-axis direction and the Y-axis direction, and the position of the power receiving coil 51 in the X-axis direction is determined by the X-axis detection coil 30A. It is detected by the Y-axis detection coil 30B.

The above-described position detection controller 14 configures a parallel resonance circuit 59 by connecting a parallel capacitor 56 in parallel with the power receiving coil 51 at the timing of detecting the position of the power receiving coil 51, as shown in the block diagram of FIG. Then, it resonates with a pulse trigger to generate an echo signal. However, the parallel capacitor 56 connected in parallel with the power receiving coil 51 slightly reduces the power efficiency when charging the internal battery 52 with the power induced in the power receiving coil 51.

7 includes a series capacitor 55 connected in series to the power receiving coil 51, a parallel capacitor 56 connected in parallel to the power receiving coil 51, a series capacitor 55, the parallel capacitor 56, and the power receiving coil 51. And a control circuit 58 that controls the switching element to be turned on and off. In the battery built-in device 50, when the position detection controller 14 outputs a position detection signal, the control circuit 58 switches on the switching element 57, connects the parallel capacitor 56 to the power receiving coil 51, and transmits the power transmission coil. 11, the control circuit 58 switches off the switching element 57 to disconnect the power receiving coil 51 and the parallel capacitor 56, and the power receiving coil is connected via the series capacitor 55. The alternating current 51 is output to the rectifier circuit 53.

As shown in the figure, the series capacitor 55 is connected between the parallel capacitor 56 and the power receiving coil 51, or although not shown, it can also be connected to the rectifier circuit side of the parallel capacitor. The series capacitor 55 connected between the parallel capacitor 56 and the power receiving coil 51 is connected in series with the parallel capacitor 56 in a state where the switching element 57 is switched on. Accordingly, the capacitance of the capacitor that realizes the power receiving coil 51 and the parallel resonance circuit 59 is a combined capacitance in which the series capacitor 55 and the two parallel capacitors 56 are connected in series.

The battery built-in device 50 and the charging stand 10 described above normally constitute a parallel resonance circuit 59 to accurately detect the position of the power receiving coil 51, and at the time of charging, the parallel capacitor 56 is disconnected to increase power efficiency and be built in. There is a feature that the battery 52 can be charged efficiently. The echo signal can be generated because the parallel capacitor 56 is connected in parallel with the power receiving coil 51 in the state where the position of the power receiving coil 51 is detected. The reason why the internal battery 52 can be efficiently charged by increasing the power efficiency is that the internal battery 52 is charged in series with the power receiving coil 51 without connecting a capacitor in parallel with the power receiving coil 51. This is because the power of the power receiving coil 51 can be output to the rectifier circuit 53 by connecting the capacitor 55 to the rectifier circuit 53. The circuit configuration in which the series capacitor 55 is connected to the power receiving coil 51 improves the power efficiency and suppresses the heat generation of the coil and the battery during charging, compared with the circuit configuration with a small transmission current connected to the power receiving coil, and the built-in battery 52 can be charged efficiently, promptly and safely.

The control circuit 58 turns on the switching element 57 and connects the parallel capacitor 56 to the power receiving coil 51 in a state where the position of the power receiving coil 51 is detected. The power receiving coil 51 connected in parallel with the parallel capacitor 56 is excited by the position detection signal output from the position detection coil 30 and outputs a high level echo signal. When the echo signal having the waveform as described above is detected, the charging base identification circuit 33 can recognize and identify that the power receiving coil 51 of the battery built-in device 50 is mounted. When a waveform different from the waveform of the echo signal is detected and identified, the power supply can be stopped assuming that a device other than the power receiving coil 51 (for example, a metal foreign object) of the battery built-in device 50 is mounted. When the waveform of the echo signal is not detected or identified, the power supply coil 51 of the battery built-in device 50 is not mounted and power is not supplied.

After the position of the power receiving coil 51 is detected and the power transmitting coil 11 is brought close to the power receiving coil 51, the control circuit 58 switches the switching element 57 off so that the parallel capacitor 56 is not connected to the power receiving coil 51. That is, in a state where power is transferred from the power transmission coil 11 to the power reception coil 51, the control circuit 58 turns off the switching element 57 and disconnects the parallel capacitor 56 from the power reception coil 51. The output is efficiently output to the rectifier circuit 53 via the series capacitor 55.

The above position detection circuit detects the position of the power receiving coil by the magnitude of the echo signal from the power receiving coil 51 with respect to the position detection signal of the pulse signal, but the position detection circuit is not shown, but the inductance and impedance of the power transmission coil are not shown. The position of the power receiving coil of the battery built-in device can be detected by the change.

The charging stand 10 supplies AC power to the power transmission coil 11 with the AC power supply 12 in a state where the position detection controller 14 controls the moving mechanism 13 to bring the power transmission coil 11 close to the power reception coil 51. The AC power of the power transmission coil 11 is transferred to the power receiving coil 51 and charges the built-in battery 52. When the internal battery 52 is fully charged, this is detected by the charge control circuit 54, and a full charge signal is transmitted to the charging base 10 by the transmission circuit 66. The charging stand 10 detects the full charge signal transmitted from the transmission circuit 66 by the detection signal detection unit 17. When detecting the full charge signal, the control circuit 18 controls the AC power supply 12 to stop the power supply to the power transmission coil 11.

The transmission circuit 66 transmits various transmission signals such as a foreign substance detection signal, a full charge signal of the built-in battery 52, and an ID signal from the battery built-in device 50 to the charging stand 10. The transmission circuit 66 transmits various transmission signals to the power transmission coil 11 by changing the load impedance of the power receiving coil 51. In the transmission circuit 66 of FIG. 7, the modulation circuit 61 is connected to the power receiving coil 51. The modulation circuit 61 connects a load such as a capacitor or a resistor and a switching element in series, and controls on / off of the switching element to transmit various transmission signals to the charging stand 10.

Here, the transmission circuit 66 of FIG. 7 uses the parallel circuit 56 provided as the position detection controller 14, the switching element 57, and the control circuit 58 for controlling the switching element 57 to be turned on / off in the modulation circuit 61. The transmission circuit 66 composed of the modulation circuit 61 controls the switching element 57 to be turned on and off in a state in which a signal is transmitted to the charging stand 10 and changes the connection state between the parallel capacitor 56 and the power receiving coil 51 to perform various transmissions. A signal is transmitted to the charging stand 10. For this reason, this battery built-in apparatus 50 can detect the position of the receiving coil 51, transmitting information and a signal to the charging stand 10 in an ideal state, without making manufacturing cost high.

The detection signal detector 17 of the charging stand 10 detects the detection signal transmitted from the transmission circuit 66. The detection signal detection unit 17 detects a transmission signal transmitted from the transmission circuit 66 that is the modulation circuit 61 by detecting an impedance change, a voltage change, a current change, and the like of the power transmission coil 11. When the load impedance of the power receiving coil 51 changes, the impedance, voltage, and current of the electromagnetically coupled power transmission coil 11 change. Therefore, the detection signal detection unit 17 detects these changes, and the battery built-in device 50. The transmission signal can be detected.

However, the transmission circuit may be a circuit that modulates and transmits a carrier wave, that is, a transmitter. The detection signal detector for the transmission signal transmitted from the transmission circuit is a receiver that receives a carrier wave and detects the transmission signal. The transmission circuit and the detection signal detection unit can have all circuit configurations capable of transmitting a transmission signal from the battery built-in device to the charging stand.

The foreign object detection circuit 65 of the battery built-in device 50 detects that a foreign object has been placed on the charging base 10 from the temperature sensor 64 that detects the temperature inside the case 60, that is, the temperature sensor 64 detected by the circuit board 62. When the foreign object detection circuit 65 detects a foreign object, the detection signal is transmitted to the charging base 10 by the transmission circuit 66. When the charging base 10 receives the detection signal, the control circuit 18 controls the AC power supply 12 to control the power supplied to the power transmission coil 11. The control circuit 18 limits the power supply to the power transmission coil 11 to be smaller than the specified power and charges the built-in battery 52 without interrupting the power supply to the power transmission coil 11 in a state of detecting the detection signal.

The foreign object detection circuit 65 has a foreign object placed on the charging stand 10 from a temperature difference (ΔT) of temperature detected by the temperature sensor 64 at a predetermined time, a temperature gradient, a threshold value, or a combination thereof. Detect that. When a foreign object is placed on the charging stand 10, the foreign object generates heat. For this reason, when a foreign object is placed on the charging stand 10, the temperature in the case 60 of the battery built-in device 50 becomes higher than in a state where no foreign object is placed. Therefore, the foreign object detection circuit 65 can detect a foreign object at the temperature detected by the temperature sensor 64. The foreign object detection circuit 65 stores a temperature rise in a normal state where no foreign object is placed in the memory 67 as a lookup table or a function. The foreign object detection circuit 65 compares the temperature rise stored in the memory 67 with the temperature detected by the temperature sensor 64 to determine whether a foreign object has been placed on the charging stand 10.

The foreign object detection circuit 65 detects a foreign object from the initial stage when the battery built-in device 50 is set on the charging stand 10 and charging is started. The charging stand 10 detects that the battery built-in device 50 is set, and further brings the power transmission coil 11 closer to the power receiving coil 51, then supplies AC power to the power transmission coil 11, and the built-in battery of the battery built-in device 50. 52 starts charging. In a state where AC power is supplied to the power transmission coil 11, the foreign object detection circuit 65 detects a foreign object.

In the state in which the built-in battery 52 is charged, the control circuit 18 of the charging stand 10 detects the foreign matter by setting the power supplied to the power transmission coil 11 to the specified power, or to be larger or smaller than the specified power. 10 to 12 show the power supplied to the power transmission coil 11 during the detection time. The control circuit 18 in FIG. 7 includes a memory 28 that stores the charging time and power at the initial charging timing for supplying power to the power transmission coil 11 at the beginning of charging, and the charging time and power at the detection time.

FIG. 10 shows a state in which a foreign object is detected without changing the power (indicated by line C) supplied to the power transmission coil 11 by the control circuit 18. The charging stand 10 and the battery built-in device 50 supply specified power to the power transmission coil 11 and detect foreign matter at the temperature detected by the temperature sensor 64. In this figure, line A shows a state where the temperature detected by the temperature sensor 64 rises when no foreign matter is placed thereon, and line B shows a state where the temperature detected by the temperature sensor 64 rises when a foreign matter is placed. Show. The temperature inside the case of the battery built-in device 50 detected by the temperature sensor 64 and BR> X increases when the foreign object is placed on the charging stand 10 due to the heat generated by the foreign object. The gradient in which the temperature rises varies depending on the size, shape, metal material, and the like of the foreign material placed on the charging stand 10. However, compared with a state in which no foreign matter is placed, the temperature increase gradient increases due to the heat generated by the foreign matter. Therefore, as shown by line A, the temperature rising gradient of temperature sensor 64 in a state in which no foreign matter is placed is smaller than that in line B, which is the detected temperature in a state in which foreign matter is placed. The temperature detected by the temperature sensor 64 in a state where there is no foreign object, that is, the line A changes depending on the ambient temperature when charging is started. The foreign object detection circuit 65 stores the characteristics of the line A with respect to the ambient temperature at which charging is started in the memory 67 as a lookup table or a function. When the detected temperature detected by the temperature sensor 64 is higher than the set value compared to the line A, the foreign object detection circuit 65 determines that a foreign object has been placed on the charging stand 10, and if the detected temperature is not higher than the set value, the foreign object is detected. Judge that there is no.

The foreign object detection circuit 65 determines that a foreign object has been placed if the temperature gradient of the detected temperature detected by the temperature sensor 64 is greater than a set value at a predetermined time, or after a predetermined time has elapsed in the detection time. If the temperature difference (ΔT) with respect to line A is larger than the set value, it is determined that a foreign object has been placed. The foreign object detection circuit 65 compares the temperature rise gradient of the temperature detected by the temperature sensor 64 during a preset detection time (for example, 20 minutes) with the set value, or compares the temperature difference (ΔT) with the set value, It is determined whether or not a foreign object has been placed. The detection time can be lengthened to detect foreign matter more accurately, and the detection time can be shortened to detect foreign matter quickly. Therefore, this detection time can be set to, for example, 3 minutes to 30 minutes, preferably 5 minutes to 30 minutes, in consideration of detection accuracy and required detection time.

Furthermore, the foreign object detection circuit 65 can determine that a foreign object has been placed when the temperature detected by the temperature sensor 64 is higher than the threshold value. The foreign matter detection circuit 65 stores a threshold value for judging foreign matter in the memory 67. The foreign object detection circuit 65 stores the threshold value as a constant temperature, or stores it as a parameter of the ambient temperature at which charging is started.

The foreign object detection circuit 65 can also determine that a foreign object has been placed when the temperature difference between the temperature detected by the temperature sensor 64 and the line A is greater than a preset temperature difference. The foreign object detection circuit 65 compares the temperature detected by the temperature sensor 64 (T1) with the temperature (T2) of the line A that starts rising after charging and the temperature difference (T1) with the line A at every predetermined time. When -T2) becomes larger than the set temperature difference, it is determined that foreign matter has been placed.

As shown in FIG. 10, the charging stand 10 and the battery built-in device 50 that detect a foreign object by supplying specified power to the power transmission coil 11 can detect the foreign object from the beginning of charging, and can also detect a foreign object during charging. Can be detected.

FIG. 11 detects foreign matter by changing the power (indicated by line C) supplied to the power transmission coil 11 by the control circuit 18. In the charging stand 10 and the battery built-in device 50, the foreign object detection circuit 65 is connected to the temperature sensor 64 during the detection time when the control circuit 18 increases the power supplied to the power transmission coil 11 from the initial initial charging timing at which charging is started. Foreign matter is detected at the detected temperature. The power supplied to the power transmission coil 11 during the detection time is defined power for charging the internal battery 52 with a defined current. In this method, the power supplied to the power transmission coil 11 at the initial charging timing is made smaller than the specified power. However, the power supplied to the power transmission coil during the detection time can be greater than the specified power. In this method, when the detection time ends, the supply power of the power transmission coil 11 is set as the specified power.

In the detection time, the method of supplying the specified power to the power transmission coil 11 limits the power supplied to the power transmission coil 11 to be smaller than the specified power when a foreign object is detected, and specifies the power transmission coil 11 when no foreign object is detected. Continue to supply power. In the method of supplying a power larger than the specified power to the power transmission coil 11 in the detection time, the power supplied to the power transmission coil 11 is set as the specified power in a state in which no foreign object is detected after the detection time is finished. In the detected state, the power supplied to the power transmission coil 11 is made smaller than the specified power. In a state where a foreign object is detected, charging can be stopped, and the user can be notified of the detection of the foreign object from the charging stand or the in-battery device by LED emission or the like.

The detection temperature of the temperature sensor 64 during the detection time is indicated by a line A when there is no foreign matter, and is indicated by a line B when a foreign matter is placed. When the detected temperature detected by the temperature sensor 64 is higher than the set value compared to the line A, the foreign object detection circuit 65 determines that a foreign object has been placed on the charging stand 10, and if the detected temperature is not higher than the set value, the foreign object is detected. Judge that there is no. When it is determined that a foreign object has been placed, a detection signal is transmitted to the charging base 10, and the charging base 10 controls the power supplied to the power transmission coil 11 by the control circuit 18 to be smaller than the specified power.

The foreign object detection circuit 65 determines that a foreign object has been placed if the temperature gradient of the detected temperature detected by the temperature sensor 64 is greater than a set value at a predetermined time, or after a predetermined time has elapsed in the detection time. If the temperature difference (ΔT) with respect to line A is larger than the set value, it is determined that a foreign object has been placed. The foreign object detection circuit 65 compares the temperature rise gradient of the temperature detected by the temperature sensor 64 during a preset detection time (for example, 20 minutes) with the set value, or compares the temperature difference (ΔT) with the set value, It is determined whether or not a foreign object has been placed. The detection time can be lengthened to detect foreign matter more accurately, and the detection time can be shortened to detect foreign matter quickly. Therefore, this detection time can be set to, for example, 3 minutes to 30 minutes, preferably 5 minutes to 30 minutes, in consideration of detection accuracy and required detection time. Furthermore, the foreign object detection circuit 65 can also determine that a foreign object has been placed when the temperature detected by the temperature sensor 64 exceeds a threshold value during the detection time.

As shown in FIG. 13, the foreign substance detection circuit 65 detects the foreign substance in the battery built-in apparatus and the charging stand as described below. The battery built-in device and the charging stand that detect foreign matter in the flowchart of FIG. 13 determine the presence or absence of foreign matter in the detection time after the initial charging timing has elapsed.
[Steps of n = 1, 2]
At the initial initial charging timing at which charging is started, the control circuit 18 of the charging stand 10 has a charging current in which the power supplied to the power transmission coil 11 is smaller than the prescribed current, as shown in FIG. For example, the AC power supply 12 is controlled so that the power is charged at 500 mA. In this state, the battery built-in device 50 charges the built-in battery 52 for 20 minutes.
[Step n = 3]
After a predetermined time has elapsed, the temperature (Ta) in the case of the battery built-in device 50 is detected by the temperature sensor 64.
[Steps n = 4, 5]
As the detection time, as shown in FIG. 14, the control circuit 18 of the charging stand 10 causes the power supplied to the power transmission coil 11 to be the power for charging the built-in battery 52 with a specified charging current, for example, 900 mA. The AC power supply 12 is controlled. In this state, the battery built-in device 50 charges the built-in battery 52 for another 20 minutes.
[Step n = 6]
Further, after a predetermined time has elapsed, the temperature sensor 64 detects the temperature (Tb) in the case of the battery built-in device 50.
[Step n = 7]
The foreign matter detection circuit 65 compares the temperature rise (Tb−Ta) of the temperature detected by the temperature sensor 64 during the detection time (20 minutes) with a set value (for example, 12 ° C.) to determine the presence or absence of foreign matter. When the temperature rise (Tb−Ta) of the detected temperature is equal to or higher than the set value, it is determined that a foreign object is placed on the charging stand 10 and the process proceeds to step n = 8. When the temperature rise (Tb−Ta) of the detected temperature is smaller than the set value, it is determined that no foreign matter is placed on the charging stand 10 and the process proceeds to step n = 10.
[Steps n = 8, 9]
When it is determined that a foreign object is placed on the charging stand 10, the control circuit 18 of the charging stand 10 receives the power supplied to the power transmission coil 11 as shown in FIG. The AC power supply 12 is controlled so that the battery 52 is charged with a charging current smaller than a prescribed current, for example, 700 mA.
[Step n = 10]
If it is determined that no foreign matter is placed on the charging stand 10, even after the detection time is over, the control circuit 18 of the charging stand 10 charges the built-in battery 52 with the power supplied to the power transmission coil 11. The AC power supply 12 is controlled so as to be charged with a current, for example, 900 mA.
[Steps n = 11, 12]
Thereafter, charging is continued until the internal battery 52 is fully charged. When the built-in battery 52 is fully charged, a full charge signal is transmitted to the charging base 10 by the transmission circuit 66. When the charging base 10 detects the full charge signal, the control circuit 18 controls the AC power supply 12 to stop the power supply to the power transmission coil 11 and finish the charging.

FIG. 12 detects the foreign matter by reducing the power (indicated by line C) supplied to the power transmission coil 11 by the control circuit 18. In the charging stand 10 and the battery built-in device 50, the foreign object detection circuit 65 is connected to the temperature sensor 64 during the detection time in which the control circuit 18 reduces the power supplied to the power transmission coil 11 from the initial initial charging timing at which charging is started. Foreign matter is detected at the detected temperature. The power supplied to the power transmission coil 11 during the detection time is made smaller than the specified power for charging the internal battery 52 with a specified current. In this method, the power supplied to the power transmission coil 11 at the initial charging timing is defined as the specified power. However, the power supplied to the power transmission coil 11 at the initial charging timing can be made larger than the specified power. In this state, when the detection time is over and it is determined that there is no foreign object, the power supplied to the power transmission coil 11 is defined as the specified power, and when it is determined that the foreign object is placed, the power supplied to the power transmission coil 11 is defined. Control smaller than electric power.

In the detection time, the method of reducing the power supplied to the power transmission coil 11 below the specified power is such that when a foreign object is detected, the power transmission coil 11 is continuously supplied with a power smaller than the specified power, and no foreign object is detected. The power supplied to the power transmission coil 11 is increased to the specified power.

The foreign object detection circuit 65 determines that a foreign object has been placed if the temperature rise gradient of the detected temperature detected by the temperature sensor 64 is greater than a set value during the detection time, or after a predetermined time has elapsed in the detection time. When the temperature difference (ΔT) with respect to line A is higher than the set value, it is determined that a foreign object has been placed. As shown in FIG. 12, when the power supplied to the power transmission coil 11 is reduced during the detection time, the temperature rise gradient of the temperature detected by the temperature sensor 64 becomes negative as shown by line A in the absence of foreign matter. However, the temperature drop during the detection time varies depending on the power supplied to the power transmission coil 11, and the temperature drop increases as the power supplied to the power transmission coil 11 decreases. In FIG. 12, the power supplied to the power transmission coil 11 is reduced in the line A so that the temperature increase gradient becomes negative during the detection time. However, the temperature rise gradient is not necessarily negative depending on the power supplied to the power transmission coil 11 during the detection time. Therefore, the foreign matter detection circuit 65 stores the characteristics of the line A at the detection time in the memory 67 as a lookup table or a function, and the detected temperature of the temperature sensor 64 changes in comparison with the stored line A. The presence or absence of foreign matter is determined.

The foreign object detection circuit 65 compares the temperature gradient of the temperature detected by the temperature sensor 64 during a preset detection time (for example, 20 minutes) with the temperature gradient with respect to the decreasing line A, or sets the temperature difference (ΔT). Compared with the value, it is determined whether or not a foreign object has been placed. This method can also detect a foreign object accurately by lengthening the detection time, and can detect a foreign object quickly by shortening the detection time. Therefore, the detection time can be set to, for example, 3 minutes to 30 minutes, preferably 5 minutes to 30 minutes in consideration of the detection accuracy and the required detection time.

When the battery built-in device and the charging stand detect foreign matter while charging the built-in battery 52, the power supplied to the power transmission coil 11 is limited to be smaller than the specified power, and the built-in battery 52 continues to be charged. Therefore, the battery built-in device and the charging stand can charge the built-in battery 52 while reducing the heat generated by the foreign matter even when the foreign matter is placed thereon. The internal battery 52 continues to be charged in a state where a foreign object is placed, but if the temperature of the internal battery 52 becomes higher than the preset maximum temperature in this state, the internal battery 52 is stopped and the internal battery 52 is safely embedded. The battery 52 can be charged.

Moreover, in the state in which a foreign object is detected, charging of the internal battery 52 can be stopped as a state in which AC power is not supplied to the power transmission coil 11.

DESCRIPTION OF SYMBOLS 10 ... Charge stand 11 ... Power transmission coil 12 ... AC power supply 13 ... Moving mechanism 14 ... Position detection controller 15 ... Core 15A ... Cylindrical part 15B ... Cylindrical part 16 ... Lead wire 17 ... Detection signal detection part 18 ... Control circuit 19 ... Approach Mechanism 20 ... Case 21 ... Top plate 22 ... Servo motor 22A ... X-axis servo motor 22B ... Y-axis servo motor 23 ... Screw rod 23A ... X-axis screw rod 23B ... Y-axis screw rod 24 ... Nut material 24A ... X-axis nut material 24B ... Y-axis nut material 25 ... Belt 26 ... Guide rod 27 ... Guide part 28 ... Memory 30 ... Position detection coil 30A ... X-axis detection coil 30B ... Y-axis detection coil 31 ... Detection signal generation circuit 32 ... Reception circuit 33 ... Identification Circuit 34 ... Conversion circuit 35 ... Limiter circuit 50 ... Battery built-in device 51 ... Power receiving coil 52 ... Built-in battery 53 ... Rectifier circuit 53A ... Diode bridge 53B ... Smoothing capacitor 54 ... Charge control circuit 55 ... Series capacitor 56 ... Parallel capacitor 57 ... Switching element 58 ... Control circuit 59 ... Parallel resonance circuit 60 ... Case 61 ... Modulation circuit 62 ... Circuit board 63 ... Insulating holder 64 ... Temperature sensor 65 ... Foreign substance detection circuit 66 ... Transmission circuit 67 ... Memory 68 ... Temperature sensor 68A ... Temperature sensing part 68B ... Lead Line 69 ... Battery temperature detection circuit

Claims

A charging stand (10) having a power transmission coil (11) and a battery built-in device (50) in which a power receiving coil (51) electromagnetically coupled to the power transmission coil (11) is built in a case (60), A battery built-in device and a charging stand configured to charge the built-in battery (52) of the battery built-in device (50) with electric power conveyed from the power transmission coil (11) to the power receiving coil (51),
The battery built-in device (50) detects a temperature sensor (64) that detects the temperature in the case (60), and detects that a foreign object has been placed on the charging stand (10) from the temperature detected by the temperature sensor (64). A foreign object detection circuit (65), and a transmission circuit (66) that transmits a detection signal to the charging base (10) in a state where the foreign object detection circuit (65) detects the foreign object,
The charging stand (10) includes a detection signal detection unit (17) that detects a detection signal transmitted from the transmission circuit (66), and the detection signal detection unit (17) detects a detection signal and transmits power. A control circuit (18) for controlling the power supplied to the coil (11),
In a state where the foreign object detection circuit (65) of the battery built-in device (50) detects a foreign object, a detection signal is transmitted from the battery built-in device (50) to the charging stand (10), and the charging stand (10) is a control circuit. (18) A battery built-in device and a charging stand configured to control power supplied to the power transmission coil (11).
2. The battery built-in device according to claim 1, wherein the foreign object detection circuit (65) detects the foreign object from any one of a temperature difference of a temperature detected by the temperature sensor (64), a temperature gradient, and a threshold value in a predetermined time. Charging stand.
The foreign object detection circuit (65) includes a memory (67) for storing a temperature rise in a normal state where no foreign object is placed on the charging stand (10) as a lookup table or a function,
The battery built-in device and the charging stand according to claim 1 or 2, wherein the foreign matter is detected by comparing the temperature rise stored in the memory (67) with the temperature detected by the temperature sensor (64).
In the detection time in which the control circuit (18) increases the power supplied to the power transmission coil (11) from the initial initial charging timing at which charging starts, the foreign object detection circuit (65) detects the temperature detected by the temperature sensor (64). The battery built-in apparatus and the charging stand according to any one of claims 1 to 3, wherein a foreign object is detected with a battery.
In the detection time in which the control circuit (18) reduces the power supplied to the power transmission coil (11) from the initial initial charging timing at which charging starts, the foreign object detection circuit (65) detects the temperature detected by the temperature sensor (64). The battery built-in apparatus and the charging stand according to any one of claims 1 to 3, wherein a foreign object is detected with a battery.
The control circuit (18) supplies constant power to the power transmission coil (11), and the foreign object detection circuit (65) detects the foreign object at the temperature detected by the temperature sensor (64). Battery built-in equipment and charging stand as described.
The control circuit (18) is a memory (28) for storing the charging time and power at the initial charging timing to supply power to the power transmission coil (11) at the beginning of charging, and the charging time and power at the abnormality detection timing. The battery built-in apparatus and charging stand as described in Claim 4 or 5.
The battery built-in device and the charging stand according to claim 6, wherein the power supplied to the power transmission coil (11) during the detection time is power for charging the built-in battery (52) of the battery built-in device (50) with a specified current. .
The battery built-in device according to any one of claims 1 to 8, wherein the control circuit (18) limits power supplied to the power transmission coil (11) in a state where the foreign object detection circuit (65) detects the foreign object. Charging stand.
The battery built-in device (50) includes a circuit board (62) for mounting a charging circuit for charging the built-in battery (52) with AC power induced in the power receiving coil (51), and the temperature sensor (64). 10. A battery built-in device and a charging stand according to claim 1, wherein the temperature sensor (64) detects the temperature of the circuit board (62).
The battery built-in device (50) includes a temperature sensor (64) for detecting the temperature of the built-in battery (52), and a temperature sensor (64) for the circuit board (62) for detecting the temperature of the circuit board (62). The battery built-in apparatus and charging stand as described in Claim 10 provided with.
A power receiving coil (51) that is electromagnetically coupled to the power transmission coil (11) of the charging base (10) is built in the case (60), and the power that is transferred from the power transmission coil (11) to the power receiving coil (51) Thus, a battery built-in device configured to charge the built-in battery (52),
A temperature sensor (64) for detecting the temperature in the case (60), and a foreign object detection circuit (65) for detecting that a foreign object is placed on the charging stand (10) from the temperature detected by the temperature sensor (64). The foreign object detection circuit (65) includes a transmission circuit (66) that transmits a detection signal to the charging stand (10) in a state where the foreign object is detected.
A battery built-in device in which the transmission circuit (66) transmits a detection signal to the charging stand (10) in a state where the foreign object detection circuit (65) detects the foreign object.