JP2010098893A - Power transmission device and power receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device and a power receiving device which perform accurate alignment so as to perform transmission of power efficiently by electromagnetic induction. <P>SOLUTION: A position detection unit 15 detects displacement between a power transmission antenna 11 of the transmission device 1 and a power reception antenna 21 of the power receiving device 2, based on an electric characteristic detected in a characteristic detection unit 14. An electromagnet control unit 16 drives and controls an electromagnet 13 based on the amount of the displacement. The positions of the power transmission antenna 11 and the power reception antenna 21 are accurately aligned, by the electromagnet 13 and a magnet 23 of the power receiving device 2 attracting each other. After the alignment, a current is supplied to the power transmission antenna 11, and an electromotive force is generated in the power reception antenna 21 of the power receiving device 2, and the power is transmitted. The efficiency of transmission of the power is improved by accurate alignment. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transmission device and a power receiving device.

  As a configuration for efficiently transmitting power by accurately aligning the positions of the antennas on the power transmission side and the power reception side, for example, in Patent Document 1, a large number of permanent magnets are arranged around the antennas on the power transmission side and the power reception side. The antennas are aligned by the attractive force of the permanent magnet.

JP 2006-238548 A

  An object of this invention is to provide the transmission apparatus and power receiving apparatus which perform transmission of electric power etc. efficiently.

  The invention according to claim 1 of the present application is detected by a power transmission unit for transmitting power, one or a plurality of electromagnets, a detection unit that detects electrical characteristics from the power transmission unit, and the detection unit. Position detecting means for detecting the position of the power receiving unit on the power receiving device that receives power transmitted from the power transmitting unit based on electrical characteristics, and energization to the electromagnet based on a detection result by the position detecting means An electromagnet control means for controlling the transmission.

  The invention according to claim 2 of the present application is characterized in that the electromagnet control means in the transmission apparatus according to claim 1 performs control to change the polarity of at least one of the plurality of electromagnets. It is.

  The invention according to claim 3 of the present application is a control that weakens the magnetic force of the electromagnet when the electromagnet control means in the transmission device according to claim 1 or 2 of the present invention transmits power from the power transmission unit. A transmission apparatus characterized by performing

  In the invention according to claim 4 of the present application, when the electromagnet control means in the transmission device according to any one of claims 1 to 3 is not aligned from the detection result of the position detection means. The transmission device is characterized in that the polarity of the electromagnet is reversed and then re-inverted.

  In the invention according to claim 5 of the present application, the electromagnet control means in the transmission device according to any one of claims 1 to 4 performs control to invert the polarity of the electromagnet after completion of power transmission. This is a transmission device.

  The invention according to claim 6 of the present application further includes an information transmission unit for transmitting information in the configuration of the transmission apparatus according to any one of claims 1 to 5 of the present application. It is.

  According to a seventh aspect of the present invention, an assembly including the power transmission unit and the electromagnet in the transmission device according to any one of the first to sixth aspects of the present invention is provided in the electromagnet and the power receiving device. The transmission device is configured to be movable by a magnetic force with the magnet.

  The invention according to claim 8 of the present application includes a power receiving unit that receives at least power transmitted by electromagnetic induction from the transmission device according to any one of claims 1 to 7, and the transmission device. A power receiving device having one or more magnets provided corresponding to an electromagnet.

  According to the first aspect of the present invention, it is possible to increase the possibility of efficiently transmitting power and the like as compared with the case where the present invention is not adopted.

  According to the second aspect of the present invention, it is possible to perform alignment in the rotational direction as compared with the case where the present invention is not adopted.

  According to the third aspect of the present invention, the influence of the electromagnet on the transmission of power from the power transmission unit can be reduced as compared with the case where the present invention is not adopted.

  According to the invention described in claim 4 of the present application, it is possible to perform alignment again when stopping at a position shifted by magnetic force as compared with the case where the present invention is not adopted.

  According to the invention described in claim 5 of the present application, it is possible to easily remove the power receiving apparatus after the transmission is completed, as compared with the case where the present invention is not adopted.

  According to the sixth aspect of the present invention, information can be transmitted independently of power transmission as compared with the case where the present invention is not adopted.

  According to the seventh aspect of the present invention, the alignment distance between the power receiving device and the transmission device can be increased as compared with the case where the present invention is not adopted.

  According to the invention described in claim 8 of the present application, alignment with the transmission device described in any one of claims 1 to 7 of the present application is performed more accurately than in the case where the present invention is not employed. Can do.

  FIG. 1 is a configuration diagram showing an embodiment of the present invention. In the figure, 1 is a transmission device, 2 is a power reception device, 11 is a power transmission antenna, 12 is a magnetic body, 13 is an electromagnet, 14 is a characteristic detection unit, 15 is a position detection unit, 16 is an electromagnet control unit, and 21 is a power reception antenna. , 22 is a magnetic body, and 23 is a magnet. In this configuration, power or further information is transmitted from the transmission device 1 to the power receiving device 2 by various means such as electromagnetic induction, electromagnetic waves, and light without making electrical contact.

  The transmission device 1 includes a power transmission antenna 11, a magnetic body 12, an electromagnet 13, a characteristic detection unit 14, a position detection unit 15, an electromagnet control unit 16, and the like. The power transmission antenna 11 is an example of a power transmission unit, and a conductor is provided in a coil shape or a spiral shape. The shape of the coil or spiral is not limited to a circle, but may be any rectangle. By passing an alternating current through the power transmission antenna 11, a current is generated in the power receiving antenna 21 provided on the power receiving device 2 side by electromagnetic induction, and the power is transmitted. When power is supplied to the power transmission antenna 11, if information is modulated, information is transmitted together with the power.

  The magnetic body 12 is provided on the surface opposite to the surface on which the power receiving device 2 of the power transmission antenna 11 is disposed. The magnetic body 12 stabilizes the magnetic field generated by the power transmission antenna 11 and improves the coupling efficiency of the magnetic field with the power receiving antenna 21 on the power receiving device 2 side. Note that the magnetic body 12 may be omitted.

  One or a plurality of electromagnets 13 (13-1, 13-2) are provided at positions that do not overlap with the power transmission antenna 11. In the example shown in FIG. 1, two are provided at positions sandwiching the power transmission antenna 11. The arrangement of the electromagnet 13 may be freely set within a range that does not hinder the alignment with the power receiving device 2, and some arrangement examples will be described later. Moreover, you may use a magnet together.

  The characteristic detection unit 14 detects an electric characteristic for detecting a positional deviation from the power receiving antenna 21 of the power receiving device 2 from the power transmission antenna 11. As an example, the impedance may be detected from the power transmission antenna 11. Of course, electrical characteristics other than impedance may be detected, or position information may be detected using a method using ultrasonic waves or an optical method.

  The position detection unit 15 detects a positional deviation between the power transmission antenna 11 and the power reception antenna 21 on the power reception device 2 side based on information detected by the characteristic detection unit 14, for example, electrical characteristics.

  The electromagnet control unit 16 controls energization to the electromagnet 13. For example, the power transmission antenna 11 and the power receiving antenna 21 on the power receiving device 2 side are aligned by controlling energization to the electromagnet 13 based on the detection result by the position detection unit 15. When a plurality of electromagnets 13 are provided, the polarities of at least one electromagnet 13 are made different. For example, in the example shown in FIG. 1, control is performed so that one is the S pole and the other is the N pole, which corresponds to positioning in the rotational direction. In addition, when it is determined that the power transmission antenna 11 and the power receiving antenna 21 of the power receiving device 2 are stopped, the position of the electromagnet 13 is reversed and then reversed. Ensure alignment. Further, when transmitting power or further information from the power transmission antenna 11, control is performed to weaken the magnetic force of the electromagnet 13, and the influence of the magnetic field generated by the electromagnet 13 on the transmission of power is reduced. Furthermore, after the transmission is completed, control is performed to reverse the polarity of the electromagnet 13 so that the transmission device 1 and the power receiving device 2 can be easily detached.

  The power receiving device 2 is a device that operates based on the power transmitted from the transmission device 1, and includes a power receiving antenna 21, a magnetic body 22, a magnet 23, and other configurations such as an electric circuit (not shown) that operates by power. It is out.

  The power receiving antenna 21 is an example of a power receiving unit, and is used to receive power transmitted by electromagnetic induction from a transmission device or to receive information. A conductor is provided in a coil shape or a spiral shape. ing. The shape of the coil or spiral is not limited to a circle, but may be any rectangle. The electric power generated by the power receiving antenna 21 is supplied to an electric circuit (not shown). When information is transmitted together with power, the information waveform may be separated and demodulated.

  The magnetic body 22 is provided on a surface opposite to the surface on which the transmission device 1 of the power receiving antenna 21 is disposed. The magnetic body 22 stabilizes the magnetic field generated in the power receiving antenna 21 and improves the coupling efficiency of the magnetic field with the power transmission antenna 11 on the transmission device 1 side. The magnetic body 22 may be omitted.

  The magnets 23 (23-1, 23-2) are provided at positions corresponding to the electromagnets 13 of the transmission device 1. When the transmission apparatus 1 is provided with a magnet, the magnet 23 may be provided at a position corresponding to the magnet. The magnet 23, the electromagnet 13 of the transmission apparatus 1, and the magnet overlap with each other so that the power receiving antenna 21 and the power transmission antenna 11 of the transmission apparatus 1 are aligned. The polarity of the magnet 23 may be opposite to the polarity of the electromagnet or magnet of the transmission device 1. In addition, as described above, at least one of the electromagnets 13 and the magnets on the transmission device 1 side is controlled to have different polarities, so the magnet 23 of the power receiving device 2 is also different from the corresponding ones. They are provided with different polarities. In the example shown in FIG. 1, the magnet 23-1 is shown as an N pole and the magnet 23-2 is shown as an S pole, but this is because the electromagnets 13-1 and 13-2 corresponding to the respective magnets on the transmission device 1 side. These are shown as being controlled so as to be the S pole and the N pole, respectively.

  FIG. 2 is an explanatory diagram of an arrangement example of the electromagnet 13 of the transmission device 1 and the magnet 23 of the power reception device 2. As described above, the electromagnet 13 of the transmission device 1 and the magnet 23 of the power reception device 2 are provided at positions corresponding to each other, and the electromagnet 13 and the magnet 23 are attracted to each other, thereby attracting the power transmission antenna 11. Alignment with the power receiving antenna 21 is performed. For this purpose, the electromagnet 13 and the magnet 23 may be arranged at positions where the respective antennas face each other as shown in FIG. In the example shown in FIG. 2A, an example is shown in which the electromagnet 13 is arranged at the center of the power transmission antenna 11 and the magnet 23 is arranged at the center of the power receiving antenna 21. If alignment is performed at the center of both antennas, efficient power transmission is performed. In this example, alignment cannot be performed in the rotation direction.

  In the example shown in FIG. 2B, one of the two electromagnets 13 provided in a position facing the power transmission antenna 11 in FIG. 1 is configured by a magnet. In the example shown in FIG. 2C, an example is shown in which two electromagnets 13 and one magnet are arranged on the transmission device 1 side, and correspondingly three magnets 23 are arranged on the power reception device 2 side. Of course, more electromagnets 13 and magnets may be arranged on the transmission device 1 side, and more magnets 23 may be provided on the power reception device 2 side correspondingly. Even in these arrangements, accurate alignment including the rotation direction is performed.

  In the example shown in FIG. 2 (D), an example is shown in which both poles of the electromagnet 13 and the magnet 23 are disposed so as to be exposed on the opposing surfaces. This configuration may be realized by arranging two electromagnets 13 and magnets 23 side by side.

  Of course, it is not limited to these examples, and various arrangements are possible. When a plurality of electromagnets 13 are used, it is preferable that at least one of the electromagnets 13 has a different polarity and is arranged so as to be uniquely aligned with respect to the position in the two-dimensional direction and the rotation direction. In the following description, it is assumed that the electromagnet 13 and the magnet 23 are arranged at the arrangement position shown in FIG.

  FIG. 3 is an explanatory diagram illustrating an example of a basic operation according to the embodiment of the present invention. Basically, as shown in FIG. 3, either or both of the transmission device 1 and the power receiving device 2 are movable, the power transmission antenna 11 and the electromagnet 13 of the transmission device 1, the power receiving antenna 21 of the power receiving device 2, and The magnet 23 is opposed. In this state, when the electromagnet 13 of the transmission device 1 is energized, magnetism is generated in the electromagnet 13, and the S pole of the magnet 23 of the power receiving device 2 and the electromagnet 13 controlled to become the N pole becomes the S pole again. The N poles of the electromagnet 13 and the magnet 23 of the power receiving device 2 controlled as described above attract each other. Thereby, alignment of the transmission apparatus 1 and the power receiving apparatus 2 is performed. For example, as shown in FIG. 3 (A), even when both are deviated before the electromagnet 13 is energized, the energization of the electromagnet 13 of the transmission apparatus 1 attracts the polarities different from those of the magnet 23 of the power receiving apparatus 2. Both positions match as shown in B). In addition, by providing the plurality of electromagnets 13 and the corresponding plurality of magnets 23, the rotation direction is also aligned.

  If alternating current is supplied to the power transmission antenna 11 of the transmission device 1 in the aligned state, current flows through the power reception antenna 21 of the power reception device 2 by electromagnetic induction, and power is transmitted to the power reception device 2. The transmitted power is supplied to the electrical configuration in the power receiving device 2. In the case where the magnetic bodies 12 and 22 are provided, the magnetic bodies 12 and 22 may be saturated by a magnetic field generated by the alignment electromagnet 13 and the magnet 23 and the transmission efficiency may be reduced. In order to prevent such a decrease in transmission efficiency, control may be performed to weaken the magnetic force of the electromagnet 13 to the minimum necessary after alignment.

  When the positions of the power transmission antenna 11 of the transmission device 1 and the power reception antenna 21 of the power reception device 2 are shifted, it is necessary to move the transmission device 1 and / or the power reception device 2. For example, when one is light or the friction during movement is small, at least one moves by magnetic force and alignment is performed without providing a special configuration.

  Of course, movable means can be provided on one side. FIG. 4 is a cross-sectional view of an example in which a movable configuration is applied to the transmission device 1. In the example illustrated in FIG. 4, the assembly including at least the power transmission antenna 11 and the electromagnet 13 is configured to move freely within the movable range of the transmission device 1. In FIG. 4, since the cross section is shown, the range of motion is shown in a straight line, but the range of motion is set two-dimensionally. Moreover, it is good to comprise so that it may move also about a rotation direction. The assembly is moved by the magnetic force between the electromagnet 13 on the transmission device 1 side and the magnet 23 on the power reception device 2 side, and alignment is performed. In addition, what is necessary is just to apply a well-known means for the specific structure for an assembly to move. Here, the movable configuration is applied to the transmission device 1 side, but the movable configuration may be applied to the power receiving device 2 side.

  FIG. 5 is a flowchart showing an example of the operation in the transmission apparatus 1. Among the basic operations described above, when the transmission device 1 and the power receiving device 2 are aligned, the transmission device 1 controls the electromagnet 13. An example of this control is shown in FIG.

  First, in S <b> 51, the characteristic detection unit 14 detects the electric characteristic of the power transmission antenna 11. Here, as an example, the impedance of the power transmission antenna 11 is detected. FIG. 6 is a circuit diagram of a configuration example for detecting impedance. In the figure, 31 is an AC power source, 32 is a switching element, 33 is a resistor, and 34 is a detector. Power is supplied from the AC power supply 31 to the power transmission antenna 11 through the switching element 32 with an AC current that matches the resonance frequency of the power transmission antenna 11. The resistor 33 is connected in series to the power transmission antenna 11, and the voltage drop at the resistor 33 is measured by the detector 34, whereby the impedance in the power transmission antenna 11 is indirectly measured. Of course, as described above, electrical characteristics other than impedance may be detected, or position information may be acquired using a method using ultrasonic waves or an optical method.

  When the positions of the power transmission antenna 11 and the power reception antenna 21 of the power reception device 2 are matched, power is transmitted to the power reception antenna 21 by electromagnetic induction, so that the voltage drop in the power transmission antenna 11 becomes large and the resistance 33 is relatively reduced. The voltage drop at is small. Conversely, if the position of the power transmission antenna 11 and the power receiving antenna 21 of the power receiving apparatus 2 are shifted, the power transmission efficiency is reduced, so that the voltage drop in the power transmission antenna 11 is small and the voltage at the resistor 33 is relatively low. The decline is greater. Therefore, when the voltage drop at the resistor 33 is measured by the detector 34 with the configuration shown in FIG. 6, the impedance in the power transmission antenna 11 is indirectly measured.

  In S <b> 52, the position detection unit 15 detects a positional shift between the power transmission antenna 11 and the power reception antenna 21 on the power reception device 2 side based on the electrical characteristics detected by the characteristic detection unit 14. For example, when the impedance in the power transmission antenna 11 is indirectly detected, the impedance changes depending on the positional relationship between the power transmission antenna 11 and the power receiving antenna 21 as described above. Therefore, the positional deviation amount between the power transmission antenna 11 and the power receiving antenna 21 may be estimated from the detected impedance.

  In S53, the electromagnet control unit 16 determines the amount of current and polarity to be passed through each electromagnet 13 according to the positional shift amount between the power transmission antenna 11 and the power receiving antenna 21 detected by the position detection unit 15, and the current determined in S54. The electromagnet 13 is driven according to the amount and polarity.

  FIG. 7 is an explanatory diagram of a specific example of the operation of performing alignment by controlling the electromagnet by the electromagnet controller. FIG. 7A shows a case where the power transmission antenna 11 and the power receiving antenna 21 are greatly displaced. Thus, when both have shifted | deviated large, the amount of electric currents which flow through the electromagnet 13 is increased, and control which enlarges magnetic strength is performed. As a result, the electromagnet 13 and the magnet 23 on the power receiving device 2 side are attracted strongly, and the positions of the power transmission antenna 11 and the power receiving antenna 21 are brought closer. Here, an example is shown in which both move in parallel. For example, the displacement in the rotational direction is also corrected by the electromagnet 13 and the magnet 23 attracting each other. If the polarities of the plurality of electromagnets 13 are different, the position and direction to be positioned are uniquely determined. The polarity of each electromagnet 13 is opposite to the polarity of the corresponding magnet 23 on the power receiving device 2 side, that is, if the magnet 23 is an N pole, the electromagnet 13 is an S pole, and if the magnet 23 is an S pole, the electromagnet 13. Are controlled to be N poles.

  In the example shown in FIG. 7B, a case where the power transmission antenna 11 and the power receiving antenna 21 are stopped while being shifted is shown. Due to the relationship between the magnetic force of the electromagnet 13 and the magnet 23 on the power receiving device 2 side, the relationship between the attractive force due to the magnetic force and the frictional force, etc., there may be a case where the motor stops with a shift. In such a state, even if the magnetic force is increased, the positions of both often do not match. In such a case, control is performed to reverse the polarity of the electromagnet 13 once and then reverse it again. In this way, it is guided to the correct position by giving a disturbance.

  In S55, the characteristic detection unit 14 detects the electric characteristic of the power transmission antenna 11 again. In S56, it is determined whether or not the electric characteristic detected in S55 is within a predetermined range. For example, in the circuit shown in FIG. 6, it may be determined whether or not the voltage drop in the resistor 33 is within a predetermined range including a value when the positions of the power transmission antenna 11 and the power receiving antenna 21 are aligned.

  If it is determined in S56 that the electrical characteristic detected in S55 is outside the predetermined range, the process returns to S52, and the position shift detection based on the electrical characteristic detected in S55 is performed again.

  If it is determined in S56 that the electrical characteristics detected in S55 are within the predetermined range, it is determined that the positions of the power transmission antenna 11 and the power receiving antenna 21 are matched, and the positioning is performed. Finish the process. Then, a current is passed through the power transmission antenna 11, and power or further information is transmitted to the power receiving antenna 21 of the power receiving device 2 by electromagnetic induction. In addition, while transmitting electric power, the electromagnet controller 16 may control the current flowing through the electromagnet 13 to suppress the magnetic field generated by the electromagnet 13 so as not to affect the power transmission. .

  When the transmission of electric power or further information is completed, the electromagnet control unit 16 stops the current flowing through the electromagnet 13 or controls the reverse current to flow so that the polarity is reversed, so that the transmission device 1 and the power receiving device 2 are connected. It should be easy to remove.

  FIG. 8 is a configuration diagram showing a modification of the embodiment of the present invention. In the figure, 17 and 24 are data antennas. In this modification, a configuration is shown in which an information transmission unit for exchanging information between the transmission device 1 and the power receiving device 2 is separately provided. The data antennas 17 and 24 are an example of an information transmission unit. A data antenna 17 is provided on the transmission device 1 side, and a data antenna 24 is provided on the power receiving device 2 side. Although two are provided in FIG. 8, one or three or more may be provided. The data antenna 17 and the data antenna 24 are provided at positions facing each other when the transmission device 1 and the power receiving device 2 are aligned.

  As described above, the alignment is performed by the magnetic force between the electromagnet 13 on the transmission device 1 side and the magnet 23 on the power reception device 2 side, whereby the data antenna 17 and the data antenna 24 are also aligned, and information is efficiently transmitted and received. It can be performed. In particular, in the example shown as this modification, it is necessary to align not only the power transmission antenna 11 and the power receiving antenna 21 but also the data antenna 17 and the data antenna 24. Therefore, more accurate alignment including the rotation direction is necessary, and more accurate alignment is realized by controlling the electromagnet 13 described above.

  The transmission device 1 is configured to detect electrical characteristics from the data antenna 17 together with the power transmission antenna 11 and to detect a positional deviation from the data antenna 24 on the power receiving device 2 side, so that more accurate alignment is possible. May be performed.

  FIG. 9 is a configuration diagram showing an application example in the embodiment of the present invention, and FIG. 10 is an explanatory diagram of an example of a usage pattern in the application example of the embodiment of the present invention. In the figure, 41 is an information writing device, and 42 is a display medium. In this application example, an example in which the above-described embodiment is applied to writing of information on the display medium 42 is shown. The information writing device 41 includes the transmission device 1, and as shown in FIG. 4, the assembly including at least the power transmission antenna 11 and the electromagnet 13 moves inside during the alignment. It is configured.

  The display medium 42 is a so-called electronic paper or the like, and uses a display element that is energized to write and rewrite display information, and thereafter holds the displayed information without being energized. Yes. This display medium 42 is configured as the power receiving device 2. In the example illustrated in FIG. 9, a configuration example in which the data antenna 24 is separately provided as illustrated in FIG. 8 is illustrated. Of course, the information writing device 41 also has a corresponding data antenna 17.

  When rewriting such a display on the display medium 42, as shown in FIG. 10, the information writing device 41 is superimposed on the position of the power receiving antenna 21 on the display medium 42, or conversely, displayed on the information writing device 41. The medium 42 may be overlapped and the information writing device 41 may be instructed to write. In the information writing device 41, for example, the electromagnet 13 described in FIG. 5 is controlled to align the power transmission antenna 11 and the power receiving antenna 21 on the display medium 42, and the data antenna 17 and the data antenna 24. Thereafter, power is transmitted from the power transmission antenna 11 to the power receiving antenna 21, and information to be displayed is transmitted from the data antenna 17 to the data antenna 24. In the display medium 42, the display is rewritten based on the transmitted information based on the transmitted power. In this way, transmission of power and information is performed without electrical contact. After the display is rewritten, no power is required, and the display is maintained even after the power is no longer transmitted.

  Rewriting the display on the display medium 42 requires more power than a conventional IC card or the like, and therefore it is necessary to supply power efficiently. By accurately aligning the power transmission antenna 11 and the power receiving antenna 21, the power transmission efficiency is improved and the power required for the display medium 42 is transmitted.

  FIG. 11 is an explanatory diagram of a modification of the usage pattern in the application example of the embodiment of the invention. The display medium 42 is provided with a magnet 23 for alignment with the information writing device 41. If the magnet 23 is arranged in a direction penetrating the display medium 42, the display medium 42 has different polarities on the front and back sides. When this is used, when a plurality of display media 42 are stacked as shown in FIG. 11, the magnets 23 are attracted by magnetic force. Thereby, the alignment of the plurality of display media 42 is performed. In this state, the information writing device 41 is placed on a plurality of display media 42 or a plurality of display media 42 is placed on the information writing device 41 to transmit power and transfer information to be displayed. By performing the above, the display information on the plurality of display media 42 is rewritten.

It is a block diagram which shows one Embodiment of this invention. 4 is an explanatory diagram of an arrangement example of an electromagnet 13 of a transmission device 1 and a magnet 23 of a power reception device 2. FIG. It is explanatory drawing of an example of the basic operation | movement in one Embodiment of this invention. 2 is a cross-sectional view of an example in which a movable configuration is applied to the transmission device 1. FIG. 4 is a flowchart illustrating an example of an operation in the transmission apparatus 1; It is a circuit diagram of the example of 1 composition which detects impedance. It is explanatory drawing of the specific example of the operation | movement which controls an electromagnet by an electromagnet control part, and performs position alignment. It is a block diagram which shows the modification in one Embodiment of this invention. It is a block diagram which shows the example of application in one Embodiment of this invention. It is explanatory drawing of an example of the usage pattern in the application example of one Embodiment of this invention. It is explanatory drawing of the modification of the usage pattern in the application example of one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Transmission apparatus, 2 ... Power receiving apparatus, 11 ... Electric power transmission antenna, 12 ... Magnetic body, 13 ... Electromagnet, 14 ... Characteristic detection part, 15 ... Position detection part, 16 ... Electromagnet control part, 17 ... Data antenna, 21 ... Power receiving antenna, 22 ... magnetic material, 23 ... magnet, 24 ... data antenna, 31 ... AC power supply, 32 ... switching element, 33 ... resistor, 34 ... detector, 41 ... information writing device, 42 ... display medium.

Claims (8)

  A power transmission unit for transmitting power; one or a plurality of electromagnets; a detection unit for detecting electrical characteristics from the power transmission unit; and the power transmission unit based on the electrical characteristics detected by the detection unit A position detection unit that detects a position with a power receiving unit on a power receiving device that receives power transmitted from the power source, and an electromagnet control unit that controls energization of the electromagnet based on a detection result by the position detection unit. A characteristic transmission device.   The transmission device according to claim 1, wherein the electromagnet control unit performs control to change the polarity of at least one of the plurality of electromagnets.   The transmission device according to claim 1, wherein the electromagnet control unit performs control to weaken the magnetic force of the electromagnet when transmitting power from the power transmission unit.   The said electromagnet control means performs the control which reversely reverses the polarity of the said electromagnet, when the position is not correct from the detection result of the said position detection means, The reversal of Claim 1- Claim 3 characterized by the above-mentioned. The transmission apparatus of any one of Claims.   The transmission device according to any one of claims 1 to 4, wherein the electromagnet control unit performs control to invert the polarity of the electromagnet after transmission of power is completed.   The transmission apparatus according to claim 1, further comprising an information transmission unit that transmits information.   The assembly including the power transmission unit and the electromagnet is configured to be movable by a magnetic force between the electromagnet and a magnet provided in the power receiving device. The transmission apparatus according to item 1.   A power receiving unit that receives at least electric power transmitted by electromagnetic induction from the transmission device according to any one of claims 1 to 7, and one or more provided corresponding to the electromagnets of the transmission device A power receiving device comprising a magnet.

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