JP2006238548A - Radio power supply unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio power supply unit capable of highly efficient power supply to a receiving device by radio. <P>SOLUTION: This radio power supply unit is composed of a transmission device 1 and the receiving device 2 capable of mutual radio communication. The transmission device 1 includes a converter for converting electric energy into magnetic energy and a display circuit for sending a receiving state in the receiving device 2 to a user. The receiving device 2 includes a converter for converting magnetic energy transmitted from the transmission device 1 into electric energy and transmitter for detecting a receiving state and transmitting the detected result to the transmission device 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wireless power supply device used in a portable device equipped with a power receiving function and having high portability.

  Conventionally, wireless power supply is also referred to as non-contact power supply, and some of them are used for charging storage batteries built in cordless devices such as mobile phones and electric toothbrushes, and are electrically non-contact. In some cases, charging is performed with the portable device placed on the charger device.

  For use in a more contactless state, the card is placed over a device installed at the ticket gate, such as a traffic IC card that has recently been used, and power is obtained by electromagnetic waves from the device. There is a usage form of a card equipped with a low power consumption IC chip that operates in the same manner.

  Furthermore, there has been a form in which a solar cell is operated by generating electric power using illumination light in a use environment as energy, such as a desktop electronic computer or a wristwatch equipped with a solar cell panel.

As an example of the above-described technology, a non-contact type reading / writing device (for example, Patent Document 1) capable of reading and writing from a standby state by moving a data carrier closer, or a non-contact charger (for example, Patent Document) with reduced loss and improved conversion efficiency 2) has been proposed.
JP 2001-243431 A Japanese Patent Laid-Open No. 9-298847

  However, in the example in which the above-described solar cell panel is mounted, when the power consumption of the power receiving device that is a portable terminal increases, there is a problem that the power used by the solar cell is extremely limited due to the size limitation of the device. .

  Further, even in the case of an IC card, when the power consumption of a portable terminal increases, there is a problem that operation cannot be performed unless accurate alignment is performed and the card is brought into close contact with the apparatus.

  Furthermore, in an example such as an electric toothbrush, when using the mobile terminal side and when charging are separated in time, there is a problem that the capacity of the built-in storage battery for use increases. .

  As described above, there is an increasing need for a wireless power supply device for operating a portable device with high power consumption without mounting a large-capacity storage battery on a thin and light portable terminal. -There was a trade-off issue of cost, size, thickness, and operating time.

  Therefore, an object of the present invention is to provide a wireless power supply device that can efficiently supply power to a power receiving device wirelessly.

  In order to solve this problem, a wireless power supply device of the present invention is a wireless power supply device including a power transmission device and a power reception device capable of wireless communication with each other, and the power transmission device converts electrical energy into magnetic energy. Means for converting and notifying means for notifying a user of a power receiving state in the power receiving device, the power receiving device detects the power receiving state and means for converting magnetic energy transmitted from the power transmitting device into electric energy. Means for transmitting the result to the power transmission device are provided.

  In a preferred embodiment of the present invention, the supply of magnetic energy from the power transmission device to the power reception device and the wireless communication between the power transmission device and the power reception device are configured by a common antenna circuit.

  In a further preferred aspect of the present invention, the power transmission device changes the amount of emitted light in the notification means according to the power reception state detected by the power reception device.

  In a further preferred aspect of the present invention, the power transmission device includes means for controlling the antenna drive circuit in accordance with a power reception state detected by the power reception device.

  In a further preferred aspect of the present invention, the antenna circuit is formed by forming a coil in a spiral shape.

  In a further preferred aspect of the present invention, the power receiving device is provided with a plurality of antenna circuits to detect the amount of power received by these antenna circuits, and the power transmitting device is configured to notify the amount of power received by the plurality of antenna circuits. Is displayed with the light emission quantity and the light emission position.

  In a further preferred aspect of the present invention, the power transmitting device and the power receiving device perform power supply with a plurality of sets of antenna circuits.

  In a further preferred aspect of the present invention, in the antenna circuit of the power transmission device, a power supply coil is formed in a Helmholtz coil shape and sandwiches a coil surface of the antenna circuit for power of the power reception device.

  In a further preferred aspect of the present invention, the power receiving apparatus adds unique ID information to the power receiving apparatus and sends the power receiving apparatus to the power transmitting apparatus.

  In a further preferred aspect of the present invention, the power transmitting device and the power receiving device are provided with magnets that attract each other in a state where the centers of the antenna circuits coincide with each other around the antenna circuit.

  In a further preferred aspect of the present invention, the power receiving device is provided in a peripheral portion of the mobile terminal device.

  In a further preferred aspect of the present invention, the power transmission device is provided with a dielectric sheet on a surface of the antenna circuit far from the power reception device.

  In a further preferred aspect of the present invention, the power receiving device is provided with a dielectric sheet on a surface of the antenna circuit far from the power transmitting device.

  In a further preferred aspect of the present invention, at least one of the power transmitting device and the power receiving device performs sound notification.

  In a further preferred aspect of the present invention, the power transmission device includes an interface unit with an external device.

  In a further preferred aspect of the present invention, the circuit mounted on the power transmission device and the power reception device is made of an organic semiconductor.

  According to the present invention, the power reception status in the power receiving device is fed back to the power transmitting device and this is notified to the user, so that power can be supplied to the power receiving device wirelessly and efficiently without contact. An effective effect is obtained.

  The invention according to claim 1 of the present invention is a wireless power supply device including a power transmission device and a power reception device capable of wireless communication with each other, wherein the power transmission device includes means for converting electrical energy into magnetic energy and the power reception device. The power receiving device includes means for converting the magnetic energy transmitted from the power transmission device into electrical energy, and means for detecting the power reception state and transmitting the detection result to the power transmission device. The wireless power supply device is provided, and the power reception status in the power receiving device is fed back to the power transmitting device and this is notified to the user, so that the power supply to the power receiving device is efficiently performed wirelessly in a non-contact manner. Has the effect of being able to

  According to a second aspect of the present invention, in the first aspect of the invention, the supply of magnetic energy from the power transmission apparatus to the power reception apparatus and the wireless communication between the power transmission apparatus and the power reception apparatus are configured by a common antenna circuit. The wireless power supply device can reduce the number of parts and can further reduce the size, weight, and thickness of the wireless power supply device.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the power transmission device is a wireless power supply device that changes the amount of emitted light in the notification means according to the power reception state detected by the power reception device. Since the change in the amount of power supply accompanying the positional relationship between the power transmitting device and the power receiving device can be visually fed back to the user, the power receiving device can be guided to an efficient position.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the power transmission device includes means for controlling the antenna drive circuit according to the power reception state detected by the power reception device. The wireless power supply device is provided and has an effect that power can be supplied to the power receiving device with maximum efficiency.

  The invention according to claim 5 of the present invention is the wireless power supply apparatus according to any one of claims 1 to 4, wherein the antenna circuit is a wireless power supply device in which a coil is formed in a spiral shape. Thus, the coil length can be made longer, so that the thickness and size can be reduced.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the power receiving device is provided with a plurality of antenna circuits to detect the amount of power received by these antenna circuits. The power transmission device is a wireless power supply device that displays the amount of power received by a plurality of antenna circuits in the notification means with the light emission amount and the light emission position. Since the light emission amount and the light emission position in the notification means are visualized, to the user Since the optimum power supply position between the devices can be fed back, it can be guided to an efficient use position.

  The invention according to claim 7 of the present invention is the wireless power supply apparatus according to any one of claims 1 to 6, wherein the power transmitting device and the power receiving device are power supplies using a plurality of sets of antenna circuits. There is an effect that a larger electric power can be supplied while maintaining the thinness.

  According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, the antenna circuit of the power transmission device includes a power supply coil configured in a Helmholtz coil shape. It is a wireless power supply device that sandwiches the coil surface of the power antenna circuit, and since AC magnetic field can be supplied from both the coil surface of the power antenna circuit of the power receiving device, the transmission efficiency improves more in the same area, and more It has the effect that a large amount of power can be supplied.

  The invention according to claim 9 of the present invention is the wireless power supply according to any one of claims 1 to 8, wherein the power receiving device sends the power receiving device with the unique ID information added thereto. Even if the power receiving device is identified by the power transmitting device and the power receiving device has a different specification, by controlling the power supply suitable for that device, it is possible to achieve high-efficiency power supply or non-adaptive power receiving In the case of the device, the power supply can be interrupted to maintain safety.

  The invention according to claim 10 of the present invention is the invention according to any one of claims 1 to 9, wherein the power transmission device and the power reception device have the same center of the antenna circuit around the antenna circuit. The wireless power supply device is provided with magnets that attract each other in a state where the magnets are attracted to each other, and is guided to an efficient use position where the wireless power supply from the power transmission device to the power reception device is optimized by the attractive force between the magnets, and The position can be easily maintained.

  According to an eleventh aspect of the present invention, in the invention according to any one of the first to tenth aspects, the power receiving device is a wireless power supply device provided in a peripheral portion of the mobile terminal device. The power receiving device can be mounted without increasing the shape of the terminal device.

  According to a twelfth aspect of the present invention, in the invention according to any one of the first to eleventh aspects, the power transmission device is provided with a dielectric sheet on a surface of the antenna circuit far from the power reception device. It is a wireless power supply device, and has the effect that efficient power supply can be achieved by reducing the leakage magnetic flux generated from the antenna circuit.

  According to a thirteenth aspect of the present invention, in the invention according to any one of the first to seventh or ninth to twelfth aspects, the power receiving device includes a dielectric sheet on a surface far from the power transmitting device in the antenna circuit. The wireless power supply apparatus is provided and has an effect that efficient power supply can be performed by reducing leakage magnetic flux generated from the antenna circuit.

  According to a fourteenth aspect of the present invention, in the invention according to any one of the first to thirteenth aspects, at least one of the power transmission device and the power reception device is a wireless power supply device that performs sound notification. , It has the effect that user perceptions such as warnings can be further improved.

  According to a fifteenth aspect of the present invention, in the invention according to any one of the first to fourteenth aspects, the power transmission device is a wireless power supply device including an interface unit with an external device, By outputting the state of the power supply device using a display or a speaker included in the external device, it is possible to provide various usage guidance to the user.

  A sixteenth aspect of the present invention is the wireless power supply apparatus according to any one of the first to fifteenth aspects, wherein a circuit mounted on the power transmission device and the power reception device is formed of an organic semiconductor. Thus, the apparatus can be reduced in weight and thickness.

  Hereinafter, the best mode for carrying out the present invention will be described more specifically with reference to the drawings. Here, in the accompanying drawings, the same reference numerals are given to the same members, and duplicate descriptions are omitted. In addition, since description here is the best form by which this invention is implemented, this invention is not limited to the said form.

(Embodiment 1)
1 is a conceptual diagram showing the overall configuration of a wireless power supply apparatus according to Embodiment 1 of the present invention, FIG. 2 is a block diagram showing the configuration of a power transmitting apparatus in FIG. 1, and FIG. 3 shows the configuration of a power receiving apparatus in FIG. FIG. 4 is a schematic diagram showing an antenna circuit of the wireless power supply apparatus according to the first embodiment of the present invention. FIG. 5 is a flowchart showing an outline of the operation of the wireless power supply apparatus according to the first embodiment of the present invention. 6 is a diagram showing a first state of the display unit of the wireless power supply apparatus according to Embodiment 1 of the present invention, and FIG. 7 is a diagram showing a second state of the display unit of the wireless power supply apparatus according to Embodiment 1 of the present invention. FIG.

  In FIG. 1, the wireless power supply device according to the present embodiment includes a power transmission device 1 and a mobile terminal device 3 on which a power reception device 2 is mounted. And the power transmission apparatus 1 has the power outlet 1P for receiving power supply from an external power supply.

  In such a wireless power supply device, electromagnetic energy supplied from the power transmission device 1 is converted into electrical energy by the power receiving device 2, and this electrical energy is supplied to the mobile terminal device 3.

  As shown in FIG. 2, the power transmission device 1 constituting the wireless power supply device includes a control circuit 11, a power supply circuit 12, antenna circuits 13a and 13b, drive circuits 14a and 14b, a modulation circuit 15, a demodulation circuit 16, and a display circuit. (Notification means) 17 is provided.

  Here, the control circuit 11 controls the internal operation of the power transmission device 1 by a program installed in a built-in ROM or RAM (both not shown).

  In addition, the power transmission device 1 is connected to an external AC power source through a cable and a power outlet 1 </ b> P, and creates a DC power source that is required by the power circuit 12.

  The antenna circuit 13a and the drive circuit 14a for driving the antenna circuit 13a are circuits for supplying main power to the power receiving apparatus 2, and the antenna circuit 13b and the drive circuit 14b for driving the antenna circuit 13a are for communication with the power receiving apparatus 2. It is a circuit.

  The modulation circuit 15 is a circuit for modulating the carrier frequency. The modulation circuit 15 performs on / off control of the carrier frequency in accordance with data transmitted in response to a command from the control circuit 11, and the magnitude (or presence / absence) of the amplitude (Amplitude) of the carrier wave. An ASK (Amplitude Shift Keying) modulation system that expresses digital information bits (1/0), an FSK (Frequency Shift Keying) modulation system that switches according to data that transmits a plurality of different frequencies, and the like are used.

  The drive circuit 14a drives current to the antenna circuit 13a under the control of the control circuit 11, and radiates an electromagnetic field from the antenna circuit 13a. More specifically, a magnetic force generating coil is used for the antenna circuit 13a, and a DC voltage is converted into a high frequency boosted by an inverter circuit in the drive circuit 14a, and the magnetic force generating coil is driven to generate magnetic lines of force.

  The drive circuit 14b has a configuration similar to that of the output stage of the power amplifier, and drives the antenna circuit 13b in accordance with the output of the modulation circuit 15 to flow current. And the antenna circuit 13b radiates | emits electromagnetic waves to space by the electric current supply from the drive circuit 14b.

  Then, the demodulation circuit 16 receives the electromagnetic wave returned from the power receiving device 2 by the antenna circuit 13 b and returns it to the data, and transmits this to the control circuit 11.

  As shown in FIG. 3, the power receiving device 2 constituting the wireless power supply device includes a control circuit 21, a rectifier circuit 22a, a charging circuit 22b, a storage circuit 22c, antenna circuits 23a and 23b, a modulation circuit 25, a demodulation circuit 26, and An IF circuit 27 with the mobile terminal device 3 is provided. Further, the control circuit 21, the modulation circuit 25, and the demodulation circuit constitute an RF circuit 2RF serving as a wireless tag IC unit.

  Here, the control circuit 21 controls the internal operation of the power receiving apparatus 2 by a program installed in a built-in ROM.

  Further, the antenna circuit 23b receives the electromagnetic wave output from the antenna circuit 13b of the power transmission device 1, generates a current, and supplies power and data to the RF circuit 2RF serving as a wireless tag IC unit. Therefore, the RF circuit 2RF serving as the wireless tag IC unit can operate without supplying power from the power storage circuit 22c.

  For example, when the electromagnetic wave to be received is a microwave, a pole-shaped antenna is arranged in the antenna circuit 23b, and the RF circuit 2RF serving as a wireless tag IC unit has a low power consumption that is mounted on a wireless IC tag card. The data is configured by using a power IC chip, the data component is extracted by the demodulation circuit 26 included in the IC chip and transmitted to the control circuit 21, and the data transmitted to the power transmission device 1 by the RF circuit 2RF serving as the wireless tag IC unit is modulated. After being modulated by the circuit 25, it is placed on a carrier wave and returned as an electromagnetic wave.

  In the present embodiment, two different antenna circuits and electromagnetic waves having a plurality of frequencies are used. However, it is also possible to configure only one type of electromagnetic wave with one antenna circuit.

  As shown in FIG. 4, the antenna circuit 23a is formed of a coil in which conductive wiring is printed in a circular spiral shape on a planar insulator sheet 29, for example, and both ends of the coil are connected to the rectifier circuit 22a. . When the coil receives the alternating magnetic field output from the power transmission device 1, an alternating current is induced. The rectifier circuit 22a, for example, has a diode bridge composed of four diodes, rectifies an alternating current, and supplies the current to the charging circuit 22b.

  And if it makes such a spiral shape, since coil length can be lengthened more in the same area, thickness reduction and size reduction can be achieved.

  In FIG. 3, a power storage circuit 22 c is a circuit configured with a capacitor such as a lithium ion secondary battery or an electric double layer capacitor and having a charging function in order to store received electric energy.

  Therefore, the charging circuit 22b smoothes the electric power obtained from the rectifier circuit 22a, and then converts and controls the charging voltage and charging current suitable for the power storage circuit 22c to charge the connected power storage circuit 22c. It has a function. The electric power stored in the power storage circuit 22 c is supplied to the mobile terminal device 3 and its IF circuit 27.

  Here, it is also possible to use the output power from the power storage circuit 22c as the power source of the RF circuit 2RF serving as the wireless tag IC section. This increases the amount of power consumed by the power storage circuit 22c, but has the effect of increasing the communication distance in the data communication function.

  Next, with respect to the wireless power supply device according to the present embodiment, the mutual operation between the power transmission device 1 and the power reception device 2 will be described with reference to FIG.

  First, the power transmission device 1 intermittently outputs the signal D1 from the antenna circuit 13b in order to confirm whether the power reception device 2 exists in the vicinity (step S11). When the power receiving device 2 exists in a range where the signal D1 can be received, the RF circuit 2RF serving as the wireless tag IC unit of the power receiving device 2 enters the signal power receiving operation with the energy of the electromagnetic wave as in the known RFID chip (step S21). If the signal D1 is correctly received, the power receiving apparatus 2 returns the signal D2 in response to the signal D1 (step S22).

  The response sending operation in step S22 may be started with the power of the built-in storage battery. For example, when considering the use of a plurality of power receiving devices, a different ID may be assigned to each power receiving device, and the ID of the power receiving device 2 may be returned as information (ID = m in this figure) by the signal D2. In this case, when response signals are simultaneously received from a plurality of power receiving devices, the ID range is included in the signal D1, and collision can be avoided.

  When the power transmission device 1 detects the response signal D2 from the power reception device 2 (step S12), the power transmission device 1a temporarily drives the antenna circuit 13a with the power supply drive circuit 14a (step S13). For example, a current of about 0.1 A is supplied to a coil in which an electric wire is wound around a cylindrical core at an alternating voltage of 100 kHz.

  An AC magnetic field is generated from the antenna circuit 13a through which the AC current flows. When the antenna circuit 23a of the power receiving device 2 receives this AC magnetic field (step S23), a current proportional to the amount of energy is output from the rectifier circuit 22a. Then, this amount of current is detected (step S24), and this value is read by the control circuit 21.

  On the other hand, the power transmission device 1 sends out a signal D3 in order to know how much power the power reception device 2 is receiving (step S14). When the power receiving device 2 receives this signal D3 (step S25), the value of the received power amount read earlier is returned to the power transmitting device 1 as a response signal D4 (step S26).

  The power transmission device 1 that has detected the amount of received power (step S15) controls the display circuit 17 with a value corresponding to the amount of received power (step S16).

  And the power transmission apparatus 1 performs drive control (step S17). Here, the drive control is an operation for setting the operation time and the drive current amount of the drive circuit 14a for driving the power supply antenna circuit 13a to a specified value.

  Examples of control of the display circuit 17 are shown in FIGS.

  These show a state in which the mobile terminal device 3 equipped with the power receiving device 2 is being used close to the power transmitting device 1, and FIG. 6 shows a maximum power receiving state (first state) in the power receiving device 2. Reference numeral 7 denotes a state (second state) deviated from the maximum power reception.

  In FIG. 6, the antenna circuit 23a of the power receiving device 2 is positioned directly above the power transmitting device 1, and the charging circuit 22b supplies the maximum power to the power storage circuit 22c. The compliant data is controlled by the modulation circuit 25 and fed back to the power transmission device 1 by the antenna circuit 23b. The power transmission device 1 takes out the data received by the antenna circuit 13b by the demodulation circuit 16 and controls the display circuit 17 according to the value.

  Here, for example, the amount of light emitted from the display circuit 17 composed of LEDs is controlled to change the amount of light emission, thereby maximizing.

  As shown in FIG. 7, when the power receiving device 2 moves away from the power transmitting device 1 and the received power decreases, similarly, data according to the value of the current detection circuit is fed back to the power transmitting device 1 and incorporated in the power transmitting device 1. The light emission amount of the displayed display circuit 17 is changed.

  Note that the light emission amount can be controlled not by adjusting the current amount but also by controlling the lighting time width.

  In this embodiment, power supply and communication are performed using different types of antenna circuits. However, a common antenna circuit may be used.

  Further, although it is configured with one set of antenna circuits for power transmission, it can also be configured with a plurality of sets of antenna circuits and their drive circuits. In this way, a larger amount of power can be supplied while maintaining thinness.

  As described above, according to the wireless power supply device of the present embodiment, power can be supplied wirelessly from the power transmitting device 1 to the power receiving device 2, and the positional relationship between the devices can be visually fed back to the user. It is possible to guide to a good use position.

  In addition, when a plurality of antenna circuits are provided for power transmission, efficient power supply can be achieved by controlling the antenna drive according to the detection results that vary from the positions of the power transmission antenna circuit and the power receiving antenna circuit. it can.

  Further, by sending the unique ID of the power receiving device 2 to the power transmitting device 1, the type of the power receiving device 2 is identified by the power transmitting device 1, and even if the power receiving device 2 has a different specification, control of the power supply parameters suitable for it. In the case of the power receiving device 2 that realizes efficient power supply by performing (for example, frequency setting) or is non-adaptive (for example, power consumption supply exceeding the safety standard of the power transmitting device 1 is necessary) The power supply operation is interrupted, and a warning (for example, an error display or an abnormal warning sound) is output to the user, so that safety can be maintained.

(Embodiment 2)
FIG. 8 is a block diagram showing the configuration of the power transmitting apparatus in the second embodiment of the present invention, FIG. 9 is a block diagram showing the configuration of the power receiving apparatus in the second embodiment of the present invention, and FIG. 10 is the second embodiment of the present invention. FIG. 11 is a diagram showing a first state of the display unit of the wireless power supply apparatus according to the second embodiment of the present invention, and FIG. 12 is a second embodiment of the present invention. It is a figure which shows the 2nd state of the display part of the wireless power supply apparatus. In FIG. 12, (a) is a view from the same direction as FIG. 11, (b) is a plan view showing an example in the case of (a), and (c) is another view in the case of (a). It is a top view which shows an example.

  8, in the power transmission device 1 according to the present embodiment, a power outlet 1P connected to the AC power source described in the first embodiment and a power supply circuit 12 (both in FIG. 2) are connected to a PC 1C. The interface circuit PCI / F 18 is provided. This is, for example, a USB interface, and is performed via a connector 1C from a PC to which power supply to the power transmission device 1 is also connected. Then, by connecting the control circuit 11 and the PC via the PCI / F 18, information transmission can be performed between the PC and the power transmission device 1.

  In addition, in FIG. 9, the antenna circuit 23 a includes a plurality of antenna circuits 23 c and a detection circuit 28 is added to the power receiving device 2 of FIG. 3 described in the first embodiment. In the present embodiment, four antenna circuits 23c are connected in series to form one antenna circuit 23a, and both ends thereof are connected to the rectifier circuit 22a. Further, both ends of each antenna circuit 23 c are connected to the detection circuit 28. The detection circuit 28 detects and compares the voltage values generated at both ends of the coil of the antenna circuit 23c. For example, each value is classified into four levels of levels 0 to 3 by comparison with three different threshold values set in advance, and the result is modulated by the modulation circuit 25 via the control circuit 21, and the antenna circuit 23b. The result of the power reception status is sent from the power transmission device 1 to the power transmission device 1 for feedback.

  As shown in FIG. 10, the antenna circuit 23 c is configured by, for example, a coil in which conductive wiring is printed in a square spiral shape on a planar insulator sheet 29.

  An example of control of the display circuit 17 is shown in FIGS.

  These show the state where the portable terminal device 3 equipped with the power receiving device 2 is used close to the power transmitting device 1, and FIG. 11 shows the maximum power receiving state (first state) in the power receiving device 2. Reference numeral 12 denotes a state deviating from the maximum power reception (second state).

  Note that the power transmission device 1 and the power reception device 2 are provided with symbols such as arrows for matching the basic directions on the surface, as illustrated.

  In FIG. 11, the antenna circuit 23 c of the power receiving device 2 is positioned directly above the power transmitting device 1, and the charging circuit 22 b is supplying the maximum power to the power storage circuit 22 c, The power reception states of the two antenna circuits 23c both indicate the highest level value. These pieces of information are modulated by the modulation circuit 25 and fed back to the power transmission device 1 by the antenna circuit 23b. And the power transmission apparatus 1 takes out the data from the power receiving apparatus 2 received with the antenna circuit 13b with the demodulation circuit 16, and controls the display circuit 17 according to the value.

  Here, in the display circuit 17 composed of, for example, four LEDs, the amount of light emission is changed by controlling the amount of current that drives each LED, and all four are maximized with substantially the same brightness.

  And as shown to Fig.12 (a), (b), when the power receiving apparatus 2 moves away from the power transmission apparatus 1 to the lower right toward the drawing and the received power decreases, for example, it is close to the power transmission apparatus 1 of the power receiving apparatus 2 If the two antennas on the side detect three levels in four stages and the two antennas on the far side detect one level, an LED on the side close to the power receiving device 2 in the display circuit 17 of the power transmitting device 1 is detected. The light emission amount of level 3 is set according to the value, and the LED on the far side is set to the light emission amount corresponding to level 1.

  Similarly, as shown in FIGS. 12A and 12C, when the power receiving device 2 moves away from the power transmitting device 1 to the lower left as viewed in the drawing and the received power decreases, the center of the power transmitting device 1 is provided. The lower left of the display circuit changes the brightness corresponding to the position of the power receiving device 2.

  According to such a configuration, power can be supplied wirelessly from the power transmitting device 1 to the power receiving device 2, and the user can be visually notified of the positional relationship between the devices, so that the user can be guided to an efficient usage position. it can.

  In the present embodiment, the light sources of the antenna circuit 23c and the display circuit are four LEDs, but the number is not limited to this. Also, as a presentation to the user, it is displayed with the brightness position of the display unit corresponding to the position and its change, but it is displayed by arranging multiple types of light sources with different colors and controlling their lighting combination The color of the part can be changed and displayed.

  In addition, when the power receiving device 2 is used in close proximity, the surface of the power transmitting device 1 that may come into contact with the power receiving device 2 may have a convex shape, and the opposing surface of the power receiving device 2 may have a concave shape or the like. .

  Thereby, the coil axis centers of the antenna circuits of both the power transmission device 1 and the power reception device 2 are easily matched, and the power reception device 2 can be easily guided to a position where the energy transmission efficiency can be maximized.

  Moreover, although the direction at the time of use of the power transmission apparatus 1 and the power receiving apparatus 2 was match | combined with the symbol marked on the apparatus, when using the power transmission apparatus 1 and the power receiving apparatus 2 for the first time, FIG. The user is prompted to place the power receiving device 2 in the several arrangement states indicated as in (b) and (c), and the power receiving levels of the plurality of antenna circuits 23c obtained by the power receiving device 2 in each state are determined. The symbol can be made unnecessary by setting the initial value so that the brightness setting by the display circuit 17 of the power transmission device 1 matches the relationship with the arrangement.

(Embodiment 3)
FIG. 13 is a block diagram showing the configuration of the power transmission device according to the third embodiment of the present invention, FIG. 14 is a diagram showing an example of the usage state of the wireless power supply device according to the third embodiment of the present invention, and FIG. It is a perspective view.

  As shown in FIG. 13, in the power transmission device of the present embodiment, the antenna circuit 13a for power transmission is configured by two coils (coil 13a1 and coil 13a2).

  Moreover, as shown in FIG. 14, in arrangement | positioning of the coil 13a1 and the coil 13a2 in the power transmission apparatus 1, a Helmholtz coil is formed by arrange | positioning two coils on the upper and lower sides of the power receiving apparatus 2, and this increases the amount of supplied electric power. I am trying.

  And as shown in FIG. 15, the slit is formed in the middle stage of the triangular pyramid-shaped power transmission apparatus 1, and the coils 13a1 and 13a2 of the antenna circuit are arranged above and below the part.

  Therefore, the power is supplied by inserting the portable terminal device 3 including the power receiving device 2 into the slit portion.

  Here, a display portion by the display circuit 17 similar to that in the first and second embodiments can be provided in the upper and lower portions of the triangular pyramid.

  According to such a configuration, an AC magnetic field can be supplied from both of the coil surfaces of the power antenna circuit of the power receiving device, so that the thickness of the power receiving device 2 can be reduced without increasing the area of the antenna circuit of the power receiving unit. The amount of wireless power supplied from the power transmission device 1 to the power reception device 2 can be increased without increasing.

  Moreover, since the positional relationship between the devices can be visually suggested to the user, the power receiving device 2 can be guided to a more efficient usage position.

(Embodiment 4)
FIG. 16 is a schematic diagram illustrating an antenna unit of a power transmitting device according to Embodiment 4 of the present invention, FIG. 17 is a schematic diagram illustrating an antenna unit of a power receiving device according to Embodiment 4 of the present invention, and FIG. It is sectional drawing which shows the relationship between the power transmission apparatus in form 4, and a power receiving apparatus.

  As shown in FIG. 16, in the present embodiment, eight magnets 13 m are provided around the antenna circuit 13 a of the power transmission device 1. As shown in FIG. 17, a thin magnet 23 m is provided around the antenna circuit 23 a of the power receiving device 2.

  Then, as shown in FIG. 18, power is supplied by holding the portable terminal equipped with the power receiving device 2 over the power transmitting device 1. That is, when the centers of the antenna circuits are made to coincide with each other, the polarities of the magnets 13m on the power transmission device 1 and the polarities of the magnets 23m on the power reception device 2 are just drawn so that power is supplied.

  According to such a configuration, without increasing the thickness of the power receiving device 2, the attracting force between the magnets leads to an efficient use position where the wireless power supply from the power transmitting device 1 to the power receiving device 2 is optimized. And it can make it easy to hold the position.

  In addition, the number of magnets can be one or more instead of eight each. Furthermore, the arrangement of the magnets may be asymmetric.

  In the first to fourth embodiments described above, the example in which the small-sized power receiving device 2 is arranged at one corner with respect to the mobile terminal device 3 to be mounted has been described. However, as shown in FIG. 3 can be arranged around the periphery. In this way, the wireless power supply device can be mounted on the small portable terminal device 3.

  Further, in the power transmission device 1 of FIG. 18, a dielectric sheet having a high magnetic permeability can be provided on a surface far from the power reception device 2 of the antenna circuit 13a (the lower side in the figure). If it does in this way, magnetic flux leakage of a wireless power supply device can be controlled, and more efficient power supply will be attained.

  Further, in the power receiving device 2 in FIG. 18, a dielectric sheet having a high magnetic permeability can be provided on a surface farther from the power transmitting device 1 of the antenna circuit 23 a (upper side in the figure). If it does in this way, magnetic flux leakage of a wireless power supply device can be controlled, and more efficient power supply will be attained.

  6 and 11, a display device that emits light is provided. In addition to such an illumination function, other means such as vibration, sound, and voice that are recognized by the user can be mounted. Further, in the case of the power transmission device 1 having an interface with an external device (for example, means for connecting to a PC) as shown in FIG. 8, the power reception device 2 further uses a buzzer or a speaker mounted on the PC to generate sound or sound. Alternatively, it is possible to notify the user of the positional information and power supply status of the power transmission device 1 and the power reception device 2 by display on the display screen. In this way, user recognition about warnings and the like can be further improved.

  Various drive circuits mounted on the power transmission device 1 and the power reception device 2 can be configured by an organic semiconductor. For example, PEDOT (poly-ethylenedioxythiophene), which is a conductive polymer, is drawn by an inkjet method to form a source, a drain, and a gate, and a conjugated polymer semiconductor having a film pressure of 30 nm or less on the source and drain. A TFT having a top gate structure can be realized by forming a layer by spin coating, forming a polymer insulator layer having a film pressure of 500 nm thereon by spin coating, and forming a gate thereon. In this way, the power transmission device 1 and the power reception device 2 can be made thinner, and can be bent and reduced in weight.

  The antenna mounted on the power transmission device 1 or the power reception device 2 described above can be made of an organic material. For example, the antenna is composed of a metal plate, a magnetic material, and a conductor pattern. In order to prevent unnecessary electromagnetic field radiation from the surface of the power transmission device 1 placed on the table, a metal sheet such as aluminum is used on one side of the antenna portion, and a magnetic material or a dielectric inorganic material is provided thereon. A hybrid material in which a polymer organic material is mixed is laminated by a press or the like, and an antenna pattern is formed on the organic material with a highly conductive material having a very low resistance value by an ink jet method to produce a sheet-like antenna. In this sheet-like antenna, an apparatus is configured by mounting an IC chip with a built-in peripheral circuit so as to be in contact with the end of the antenna pattern.

  Note that the antenna of the power receiving device 2 may not have the metal plate for the previous shield.

  In general, in a PHS terminal equipped with a non-contact power transmission function using electromagnetic induction and an antenna with a coil used in an electric razor, the power transmission efficiency is as low as about 20 to 30%, and Since the coil having a larger number of turns was wound around the ferrite core in order to increase the extraction voltage, the size was also increased.

  In this embodiment mode, by performing power transmission / reception at a high frequency of 100 kHz or higher, an organic material can be used and efficiency can be improved.

  Therefore, according to such a configuration, the power transmission device 1 and the power reception device 2 can be made smaller and thinner and lighter.

  As described above, the wireless power supply device according to the present invention wirelessly supplies power by bringing the power receiving device closer to the power transmission device, and can communicate the result of detecting and observing the power supply state without contact with the power transmission device.

  Therefore, it is possible to supply power with maximum efficiency by optimizing the parameters of the mounted circuit by control according to the situation or guiding the position to the user. Even if applied, it is possible to supply non-contact power with a minimum thickness, shape and weight.

The conceptual diagram which shows the whole structure of the wireless power supply apparatus in Embodiment 1 of this invention The block diagram which shows the structure of the power transmission apparatus in FIG. The block diagram which shows the structure of the power receiving apparatus in FIG. Schematic which shows the antenna circuit of the wireless power supply apparatus in Embodiment 1 of this invention The flowchart which shows the outline | summary of operation | movement of the wireless power supply apparatus in Embodiment 1 of this invention. The figure which shows the 1st state of the display part of the wireless power supply apparatus in Embodiment 1 of this invention The figure which shows the 2nd state of the display part of the wireless power supply apparatus in Embodiment 1 of this invention The block diagram which shows the structure of the power transmission apparatus in Embodiment 2 of this invention. The block diagram which shows the structure of the power receiving apparatus in Embodiment 2 of this invention. Schematic which shows the antenna circuit of the wireless power supply apparatus in Embodiment 2 of this invention The figure which shows the 1st state of the display part of the wireless power supply apparatus in Embodiment 2 of this invention. The figure which shows the 2nd state of the display part of the wireless power supply apparatus in Embodiment 2 of this invention. The block diagram which shows the structure of the power transmission apparatus in Embodiment 3 of this invention. The figure which shows an example of the use condition of the wireless power supply apparatus in Embodiment 3 of this invention FIG. 14 is a perspective view. Schematic which shows the antenna part of the power transmission apparatus in Embodiment 4 of this invention. Schematic which shows the antenna part of the power receiving apparatus in Embodiment 4 of this invention Sectional drawing which shows the relationship between the power transmission apparatus and power receiving apparatus in Embodiment 4 of this invention Schematic which shows mounting to a portable terminal of the power receiving apparatus in other embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power transmission apparatus 1C Connector 1P Power outlet 2 Power receiving apparatus 2RF RF circuit 3 Portable terminal device 11 Control circuit 12 Power supply circuit 13a Antenna circuit 13a1 Coil 13a2 Coil 13b Antenna circuit 13m Magnet 14a Drive circuit 14b Drive circuit 15 Modulation circuit 16 Demodulation circuit 17 Display Circuit (notification means)
18 PCI / F circuit 21 Control circuit 22a Rectification circuit 22b Charging circuit 22c Storage circuit 23a Antenna circuit 23b Antenna circuit 23c Antenna circuit 23m Magnet 25 Modulation circuit 26 Demodulation circuit 27 IF circuit 28 Detection circuit 29 Insulator sheet

Claims (16)

A wireless power supply device including a power transmission device and a power reception device capable of wireless communication with each other,
The power transmission device is:
A means for converting electrical energy into magnetic energy and a notifying means for notifying a user of a power receiving state in the power receiving device;
The power receiving device is:
Means for converting magnetic energy transmitted from the power transmission device into electrical energy and means for detecting a power reception state and transmitting the detection result to the power transmission device,
A wireless power supply device. 2. The wireless power supply apparatus according to claim 1, wherein the supply of magnetic energy from the power transmission apparatus to the power reception apparatus and the wireless communication between the power transmission apparatus and the power reception apparatus are configured by a common antenna circuit. . The wireless power supply device according to claim 1, wherein the power transmission device changes a light emission amount in the notification unit according to a power reception state detected by the power reception device. The wireless power supply device according to any one of claims 1 to 3, wherein the power transmission device includes means for controlling an antenna drive circuit according to a power reception state detected by the power reception device. The wireless power supply device according to any one of claims 1 to 4, wherein the antenna circuit has a coil formed in a spiral shape. The power receiving device includes a plurality of antenna circuits to detect the amount of power received by these antenna circuits,
The wireless power supply device according to any one of claims 1 to 5, wherein the power transmission device displays the amount of power received by the plurality of antenna circuits as the light emission amount and the light emission position in the notification unit. The wireless power supply device according to any one of claims 1 to 6, wherein the power transmission device and the power reception device perform power supply using a plurality of sets of antenna circuits. The antenna circuit of the power transmission device has a coil for power supply configured in a Helmholtz coil shape, and sandwiches a coil surface of the antenna circuit for power of the power reception device. The wireless power supply device according to claim 1. The wireless power supply device according to any one of claims 1 to 8, wherein the power reception device adds unique ID information to the power reception device and sends the power reception device to the power transmission device. 10. The magnet according to claim 1, wherein the power transmitting device and the power receiving device are provided with magnets that attract each other in a state where the centers of the antenna circuits coincide with each other around the antenna circuit. The wireless power supply device according to claim 1. The wireless power supply device according to claim 1, wherein the power receiving device is provided in a peripheral portion of a mobile terminal device. The wireless power supply device according to any one of claims 1 to 11, wherein the power transmission device is provided with a dielectric sheet on a surface of the antenna circuit far from the power reception device. The radio according to any one of claims 1 to 7, or 9 to 12, wherein the power receiving device is provided with a dielectric sheet on a surface of the antenna circuit far from the power transmitting device. Power supply device. The wireless power supply device according to claim 1, wherein at least one of the power transmission device and the power reception device performs sound notification. The wireless power supply device according to any one of claims 1 to 14, wherein the power transmission device includes an interface unit with an external device. The wireless power supply device according to any one of claims 1 to 15, wherein a circuit mounted on the power transmission device and the power reception device is formed of an organic semiconductor.

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