WO2013042291A1 - 無線給電システム及び無線給電方法 - Google Patents
無線給電システム及び無線給電方法 Download PDFInfo
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- WO2013042291A1 WO2013042291A1 PCT/JP2012/003437 JP2012003437W WO2013042291A1 WO 2013042291 A1 WO2013042291 A1 WO 2013042291A1 JP 2012003437 W JP2012003437 W JP 2012003437W WO 2013042291 A1 WO2013042291 A1 WO 2013042291A1
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- power
- feeding system
- receiver
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- transmitter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/05—Circuit arrangements or systems for wireless supply or distribution of electric power using capacitive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M7/00—Power lines or rails specially adapted for electrically-propelled vehicles of special types, e.g. suspension tramway, ropeway, underground railway
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a wireless power feeding system and a wireless power feeding method for transmitting power wirelessly.
- Wireless power transmission is also called non-contact charging technology and is applied to various products today.
- a method of wireless power transmission a form using electromagnetic induction or radio waves is known.
- the electromagnetic induction system originated in the discovery of Faraday's law in 1831, and a transformer was invented in 1836.
- the transmission distance in the electromagnetic induction method is several mm or less, and the operating frequency is several hundred KHz or less.
- the electromagnetic induction system is characterized by a short transmission distance and no magnetic field leakage to the surroundings, although the amount of transmitted power depends on the design. Since wireless power transmission does not require a connector and can easily enhance waterproofness, it is used in products such as electric toothbrushes and shaver chargers.
- the radio wave (microwave) system has been researched and developed since the confirmation of the existence of electromagnetic waves by Hertz in 1888 and the wireless power transmission experiment plan by Tesla in 1904 (150 kHz, 1 MW).
- the radio wave (microwave) system is also applied to a wireless article management system (RF-ID) or the like. Since the radio wave (microwave) system uses radio waves, an electromagnetic field is radiated to the surroundings and energy is diffused. For this reason, power transmission over a long distance (up to several tens of meters) is possible, but the transmission efficiency for receiving power is as small as about several percent or less.
- the transmission efficiency refers to the ratio between the power transmitted by the power transmitter and the power received by the power receiver, that is, the power transmission rate in space.
- Patent Document 1 The main demand for wireless power transmission technology is to transmit power over a longer distance and with higher efficiency.
- MIT Massachusetts Institute of Technology
- Patent Document 1 In the magnetic field resonance method, two coils are arranged on the power transmission side and the power reception side, respectively, and the inductance (L) of each coil is increased to generate a resonance phenomenon and realize high-efficiency power transmission over a longer distance. ing.
- This magnetic resonance method achieves a transmission efficiency of about 45% when the resonance frequency is 10 MHz and the distance between the coils is 2 m (Non-patent Document 1). Since the transmission efficiency of the entire power transmission system is the total product including 37.5% which is the efficiency of the power transmission device (mainly amplifier) and 90% which is the efficiency of the power reception device (mainly rectifier), it is about 15 %. That is, when the input power to the power transmission system is 400 W, a 60 W lamp that is 2 meters ahead can be turned on. As described above, the magnetic resonance method is characterized in that power can be supplied over a longer distance and with higher efficiency than the electromagnetic induction method.
- Patent Document 2 an example in which a power receiving body is disposed in an electromagnetic field formed by a power transmitting and receiving coil is disclosed (Patent Document 2).
- an AC power supply device is connected to each of the power transmission / reception coils, and power transmission / reception can be switched.
- the energy for forming the electromagnetic field is a loss other than the energy that can be received by the power receiver.
- the electromagnetic field is formed by the electromagnetic induction method, the distance between the power transmission and reception coils cannot be increased, and is an extremely short distance of about 1/10 of the magnetic field resonance method.
- a magnetic field resonance method there is disclosed a configuration in which there are two or more power receiving devices with respect to the main power transmitting device and an auxiliary power receiving device for collecting power separately (Patent Document 3).
- the purpose is mainly magnetic resonance power supply to two or more power receiving apparatuses, and the condition for power reception is to match the resonance frequencies.
- This example is a power supply system using a one-to-many magnetic resonance method from one power transmission device to a plurality of power reception devices. In this configuration, when a plurality of power receiving devices are arranged, the distance between the power receiving devices must be maintained at a certain level or more.
- the reason for this is that when the power receiving devices approach each other, the coupling between the resonators installed in each power receiving device becomes stronger, the resonance frequency of each power receiving device deviates from the set value, and the transmission efficiency to the power receiving devices deteriorates rapidly. It is to do.
- the minimum distance between the power receivers where the shift of the resonance frequency of each power receiver is practically negligible depends on the design of the power transmitter / receiver and the power receiver, but in any case, the distance between the power receivers is limited.
- the magnetic field resonance method can increase the distance by using the resonance phenomenon, but can transmit power only within the range where the magnetic flux reaches between the power transmitting and receiving coils. It is about 1/20.
- This transmission distance substantially coincides with the diameter of the power transmission / reception coil.
- the effective transmission distance of the magnetic field resonance method is about the diameter of the power transmission / reception coil.
- the resonance frequency is 10 MHz
- the wavelength is 30 m
- the transmission distance is 1.5 m that is 1/20 of that.
- the coil diameter is 0.6 m, which is smaller than 1.5 m. Therefore, the transmission efficiency between the power transmission and reception coils was 90% at a coil interval of 1 m and 45% at a coil interval of 2 m.
- the resonance frequency should be lowered, that is, the wavelength should be increased.
- the longer the wavelength the larger the coil diameter.
- the coil on the power receiving side is closely related to the size of the device to be mounted, there is almost no application destination for the power receiving coil having a diameter of several meters or more. Therefore, it is desired to develop a wireless power feeding technique that can be mounted on a relatively small device such as a portable device and can transmit at a power feeding distance of several meters or more and is highly efficient.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless power feeding system and a wireless power feeding method capable of long-distance and highly efficient power spatial transmission.
- a wireless power feeding system includes a power transmitter that generates an electromagnetic wave, a power receiver that receives power from the power transmitter using an electric field or magnetic field resonance phenomenon, and the power transmitter.
- a power receiver inserted in an electromagnetic field formed by the power receiver and receiving power by the electromagnetic field.
- an electromagnetic field is generated between a power transmitter and a power receiver using a resonance phenomenon of an electric field or a magnetic field, and a power receiver is inserted into the electromagnetic field.
- the power receiver receives power.
- FIG. 1 is a front view schematically showing a configuration of a wireless power feeding system 100 according to a first exemplary embodiment. It is a graph which shows an example of the three-dimensional simulation result of the electromagnetic field formation in space by a magnetic field resonance system.
- 1 is a block diagram schematically showing a configuration of a wireless power feeding system 100 according to a first exemplary embodiment.
- 1 is a front view schematically showing a configuration example of a wireless power feeding system 1001 according to Example 1.
- FIG. FIG. 6 is a front view schematically showing a configuration of a wireless power feeding system 200 according to a second exemplary embodiment.
- FIG. 6 is a front view schematically illustrating a configuration example of a wireless power feeding system 2001 according to a second embodiment.
- FIG. 6 is a front view schematically showing a configuration of a wireless power feeding system 300 according to a third exemplary embodiment.
- 10 is a front view schematically showing a configuration example of a wireless power feeding system 3001 according to Example 3.
- FIG. FIG. 6 is a front view schematically showing a configuration of a wireless power feeding system 400 according to a fourth embodiment.
- FIG. 10 is a front view schematically illustrating a configuration example of a wireless power feeding system 4001 according to a fourth embodiment.
- FIG. 10 is a front view schematically showing a configuration of a wireless power feeding system 500 according to a fifth embodiment.
- FIG. 10 is a front view schematically illustrating a configuration example of a wireless power feeding system 5001 according to a fifth embodiment.
- FIG. 10 is a front view schematically illustrating a configuration example of a wireless power feeding system 6001 according to a sixth embodiment.
- FIG. 10 is a front view schematically showing a configuration example of a wireless power feeding system 7001 according to Example
- FIG. 1 is a front view schematically showing the configuration of the wireless power feeding system 100 according to the first exemplary embodiment.
- the wireless power feeding system 100 includes a power transmitter 101 and a power receiver 102.
- the power transmitter 101 is a device that transmits power wirelessly.
- the power receiver 102 is a device that receives power from the power transmitter 101.
- an electromagnetic field is formed in a space between the power transmitter 101 and the power receiver 102 by power transmission between the power transmitter 101 and the power receiver 102. That is, power transmission is performed by magnetic resonance between the power transmitter 101 and the power receiver 102.
- FIG. 1 is a front view schematically showing the configuration of the wireless power feeding system 100 according to the first exemplary embodiment.
- the wireless power feeding system 100 includes a power transmitter 101 and a power receiver 102.
- the power transmitter 101 is a device that transmits power wirelessly.
- the power receiver 102 is a device that receives power from the power transmitter 101.
- an electromagnetic field is formed in a space between the power transmitter 101 and
- magnetic field lines 110 generated by the wireless power feeding system 100 are schematically shown. Moreover, in FIG. 1, in order to show that electromagnetic waves are transmitted between the power transmitter 101 and the power receiver 102 and an electromagnetic field is formed, magnetic lines of force 110 are displayed as a representative. Therefore, only the magnetic field lines 110 do not exist between the power transmitter 101 and the power receiver 102. Hereinafter, unless otherwise specified, the magnetic field lines 110 are treated as representing the electromagnetic field between the power transmitter 101 and the power receiver 102 as described above.
- the power transmitter 101 includes a power supply device 103, a power transmission primary coil 104, and a power transmission secondary coil 105.
- the power transmission coil stores magnetic energy and serves to form a strong electromagnetic field between the power transmission coil and the power reception coil.
- the secondary coil for power transmission 105 is electrically separated from the primary coil for power transmission 104 and is electrically floating.
- the power receiver 102 includes a power receiving secondary coil 106 and a power receiving primary coil 107.
- the power collected by the power receiving primary coil 107 is returned to the power supply device 103 of the power transmitter 101 via the feedback loop 111.
- the power receiving primary coil 107 is electrically separated from the power receiving secondary coil 106 and is electrically floating.
- the resonance frequencies of the primary coil 104 for power transmission and the secondary coil 105 for power transmission of the power transmitter 101, the secondary coil 106 for power reception of the power receiver 102, and the primary coil 107 for power reception are the same.
- the power receiving body 108 that receives power supply from the wireless power feeding system 100 is inserted into the space 120 between the power transmitter 101 and the power receiver 102.
- the power receiving body 108 includes a power receiving coil 109 capable of receiving power with the power supply specifications required by the power receiving body 108. Since the magnetic field lines 110 exist in the space 120, the power receiving body 108 can be supplied with electric power by an electromagnetic induction method. That is, the power receiving body 108 receives a part of the power transmitted between the power transmitter 101 and the power receiver 102 by the power receiving coil 109. In this case, the amount of power to be received is determined by the power receiving coil 109. In particular, the amount of power received greatly depends on the power receiving coil 109. Note that in the case where the power receiving body 108 is provided with a rectifier circuit, the rectifier circuit can receive power that meets the specifications of the power receiver 108.
- the power receiving body 108 may include a plurality of power receiving coils 109, and the power obtained by the coils can be combined to obtain the received power. Further, the power receiving body 108 inserted into the space 120 is not limited to one, and a plurality of power receiving bodies can be inserted. In this case, each power receiver can receive power from an electromagnetic field using its own power receiving coil 109.
- the power receiver 108 can always receive power regardless of the position in the space. That is, even when the power receiver 108 is moving in the space 120, power can be received in the same manner as when stationary.
- the power receiver 108 has a built-in battery, the power receiver 108 can charge the battery as long as the power receiver 108 exists in the space where the electromagnetic field is formed.
- the power receiving coil 109 included in the power receiving body 108 often has a smaller coil diameter than the coils of the power transmitter 101 and the power receiver 102. For this reason, the power received by the power receiving coil 109 may be less than the voltage / current that directly drives the power receiver 108. Even in this case, the power receiving body 108 continuously receives power, thereby delaying battery consumption and extending the usable time of the power receiving body 108 or a device on which the power receiving body 108 is mounted.
- the remaining power that is not received by the power receiver 108 is input to the power receiver 102.
- the power input to the power receiver 102 is returned to the power supply device 103 of the power transmitter 101 through the feedback loop 111.
- the electromagnetic field forming function in space is handled by the power transmitter 101 and the power receiver 102, and the power receiving function is handled by the power receiver 108. That is, the magnetic field having the magnetic field lines 110 is formed in the space 120 by the power transmitter 101 and the power receiver 102.
- the power receiver is inserted into the formed magnetic field and can receive power by an electromagnetic induction method using the magnetic field lines 110.
- the power that has not been received by the power receiver 108 is received by the power receiver 102 and returned to the power supply device 103 of the power transmitter 101. That is, since the power received by the power receiver 108 is collected, energy consumption for forming an electromagnetic field can be minimized. Therefore, when attention is paid to the power receiver 108, highly efficient power transmission can be realized.
- FIG. 2 is a graph showing an example of a three-dimensional simulation result of formation of an electromagnetic field in space by the magnetic field resonance method.
- FIG. 2 shows the transmission efficiency and magnetic field strength between the power transmitter and the power receiver when the resonance frequency is 1 MHz (wavelength 300 m), the coil diameter of the power transmitter and the power receiver is 15 m, and the distance between the coils is 17 m. Distribution is shown. As shown in FIG. 2, even in long-distance transmission of about 15 m, high-efficiency transmission is possible by selecting the resonance frequency and designing the coil diameter (point A in FIG. 2). Also, 90% transmission efficiency can be ensured between the power transmitter and a position 5 m from the power transmitter (point B in FIG. 2) (point B in FIG. 2).
- Point B in FIG. 2 is an example of a case where a power receiver having a coil having a diameter of 15 m is placed at a position 5 m from the power transmitter. However, when an arbitrary power receiver is placed at this position, the power receiver is provided. The amount of power received by the power receiver is determined by the characteristics of the power receiving coil. Further, the closer the distance between the power transmitter and the power receiver, the higher the magnetic field strength in the space between them, in other words, the power receiver at the position of point B can obtain a larger amount of power received.
- a long-distance and high-efficiency power space transmission is realized by separating the electromagnetic field forming function (the power transmitter 101 and the power receiver 102) and the power receiving function (the power receiver 108) in space. be able to.
- the resonance frequencies of the power transmission side coil and the power reception side coil need to match. Therefore, for example, it is necessary to design and manufacture each coil so that the resonance frequencies of the power transmission side coil and the power reception side coil match.
- at least one of the power transmission side coil and the power reception side coil needs to have an adjustment mechanism that matches the resonance frequency.
- power can be supplied with high transmission efficiency only when the resonance frequencies of the power transmission side coil and the power reception side coil are matched by the adjusting mechanism.
- the wireless power feeding system 100 the electromagnetic field forming function and the power receiving function are separated, and the power receiver receives power by the electromagnetic induction method. Therefore, it is possible to receive power with high efficiency without considering the resonance frequency for each power receiver, and the problems of the magnetic resonance method described above can be overcome.
- FIG. 3 is a block diagram schematically illustrating the configuration of the wireless power feeding system 100 according to the first embodiment. That is, the wireless power feeding system 100 includes a power transmitter 101 and a power receiver 102, and an electromagnetic field is generated in the space 120 between the power transmitter 101 and the power receiver 102 due to power transmission between the power transmitter 101 and the power receiver 102. It is formed. That is, power transmission is performed by magnetic resonance between the power transmitter 101 and the power receiver 102. 3 schematically shows the lines of magnetic force 110 generated by the wireless power feeding system 100, as in FIG.
- the resonance frequencies of the power transmitter 101 and the power receiver 102 are the same.
- the power receiver 108 is inserted into a space 120 between the power transmitter 101 and the power receiver 102. Since the magnetic field lines 110 exist in the space 120, the power receiving body 108 can be supplied with electric power by an electromagnetic induction method. That is, the power receiver 108 can receive a part of the power transmitted between the power transmitter 101 and the power receiver 102 as power that meets the specifications of the power receiver 108.
- the power that has not been received by the power receiver 108 is received by the power receiver 102 and returned to the power transmitter 101. That is, since the power received by the power receiver 108 is recovered, energy consumption for forming an electromagnetic field can be minimized. Therefore, when attention is paid to the power receiver 108, highly efficient power transmission can be realized.
- Example 1 A wireless power feeding system according to Embodiment 1 of the present invention will be described.
- the first embodiment relates to a wireless power feeding system 1001 that is an embodiment when the wireless power feeding system 100 is applied to a room in a building.
- FIG. 4 is a front view schematically illustrating a configuration example of the wireless power feeding system 1001 according to the first embodiment.
- the power transmitter 101 is disposed behind the ceiling of the room 201, and the power receiver 102 is disposed under the floor of the room 201.
- the magnetic field lines 110 are indicated by broken lines in FIG.
- the diameters of the coils of the power transmitter 101 and the power receiver 102 are 15 m, and the distance between the coils is 5 m.
- the resonance frequency is 1 MHz.
- the primary coil 104 for power transmission and the primary coil 107 for power reception 107 are circular single-layer windings, and the secondary coil for power transmission 105 and the secondary coil 106 for power reception are circular spiral types and 5.75 winding coils are used.
- the distance between the primary coil for power transmission 104 and the secondary coil for power transmission 105 and between the secondary coil for power reception 106 and the primary coil for power reception 107 is fixed at a distance that maximizes the resonance state.
- the applied power to the power transmitter 101 is 100W. In Example 1, since the distance between the coils is 5 m, the magnetic field energy between the coils is larger as compared with the case where the distance between the coils is 17 m as shown in FIG.
- a notebook computer 112 and a mobile phone 113 are placed inside a room 201 as power receivers.
- the notebook computer 112 is placed on the table 202.
- the mobile phone 113 is put in a bag 203.
- the notebook personal computer 112 is provided with a power receiving coil having a diameter of 15 cm on the back of the display.
- the mobile phone 113 is provided with a power receiving coil having a diameter of 3 cm.
- the notebook computer 112 and the mobile phone 113 can receive power from the magnetic field lines 110 formed inside the room 201 using the power receiving coils provided in each of them. Under this condition, the notebook computer 112 can obtain a power reception amount of 8 mW. On the other hand, the mobile phone 113 can obtain a power reception amount of 1 mW.
- FIG. 5 is a front view schematically showing the configuration of the wireless power feeding system 200 according to the second embodiment. As shown in FIG. 5, the power transmitter 101 is disposed so as to surround the space 120. The other configuration of the wireless power feeding system 200 is the same as that of the wireless power feeding system 100, and thus the description thereof is omitted.
- the wireless power feeding system 200 although the position of the power transmitter 101 is different, similarly to the wireless power feeding system 100, the electromagnetic field in the space between the power transmitter 101 and the power receiver 102 can be increased. Thereby, the power receiving body 108 inserted into the space 120 can receive power with high efficiency.
- Example 2 A wireless power feeding system according to Example 2 of the present invention will be described.
- the second embodiment relates to a wireless power feeding system 2001, which is an embodiment when the wireless power feeding system 200 is applied to a room in a building.
- FIG. 6 is a front view schematically illustrating a configuration example of the wireless power feeding system 2001 according to the second embodiment.
- the power transmitter 101 is disposed so as to surround the side wall of the room 201, and the power receiver 102 is disposed under the floor of the room 201.
- the resonance frequency in the second embodiment is 1 MHz, and the diameters of the coils of the power transmitter 101 and the power receiver 102 are 15 m.
- the distance between the coils of the power transmitter 101 and the power receiver 102 is 1.5 m, and the magnetic field energy is larger than that in the first embodiment.
- the coil types of the power transmitter 101 and the power receiver 102 are the same as those in the first embodiment.
- the applied power to the power transmitter 101 is 100W.
- the electromagnetic field in the room 201 between the power transmitter 101 and the power receiver 102 can be increased. Thereby, the power receiving body placed in the room 201 can receive power with high efficiency.
- a notebook computer 112 and a mobile phone 113 are placed inside the room 201.
- the notebook computer 112 is placed on the table 202.
- the mobile phone 113 is put in a bag 203.
- These power receivers can receive power from an electromagnetic field formed in a space (inside the room 201) using a coil provided in the same as in the first embodiment.
- the amount of power to be received is determined by a coil provided in each power receiver, and the rectifier circuit can receive power that meets its specifications.
- the notebook computer 112 can obtain a power reception amount of 9 mW.
- the mobile phone 113 can obtain a power reception amount of 1.2 mW.
- FIG. 7 is a front view schematically showing the configuration of the wireless power feeding system 300 according to the third embodiment. As illustrated in FIG. 7, the wireless power feeding system 300 has a configuration in which a repeater coil 114 is added to the wireless power feeding system 100. The repeater coil 114 is electrically floating.
- the repeater coil 114 is disposed between the power transmitter 101 and the power receiver 102 so as to be parallel to the power transmitter 101 and the power receiver 102 and to surround the space 120.
- the repeater coil 114 is arranged along a plane perpendicular to the magnetic field lines 110.
- the repeater coil 114 may not be disposed along a plane that is strictly perpendicular to the magnetic field lines 110. As long as the magnetic lines of force pass through the ring of the repeater coil 114, they may be inclined with respect to the magnetic lines of force 110.
- the other configuration of the wireless power supply system 300 is the same as that of the wireless power supply system 100, and thus the description thereof is omitted.
- the magnetic field energy near the repeater coil 114 in the space 120 can be increased by the repeater coil 114.
- the power receiving body 108 inserted into the space 120 can receive power with high efficiency.
- the repeater coil 114 is disposed so as to surround an area where the presence probability of the power receiver 108 is high, the most efficient power reception is possible.
- Example 3 A wireless power feeding system according to Example 3 of the present invention will be described.
- the third embodiment relates to a wireless power feeding system 3001 that is an embodiment when the wireless power feeding system 300 is applied to a room in a building.
- FIG. 8 is a front view schematically illustrating a configuration example of the wireless power feeding system 3001 according to the third embodiment.
- the repeater coil 114 is disposed on the side surface (wall) of the room near the position of the power receiver.
- the distance between the repeater coil 114 and the power receiver 102 is 1 m.
- the resonance frequency in the third embodiment is 1 MHz.
- the diameters of the coils of the power transmitter 101 and the power receiver 102 are 15 m, and the distance between the coils of the power transmitter 101 and the power receiver 102 is 5 m.
- the types and sizes of the coils included in the power transmitter 101 and the power receiver 102 are the same as those in the first embodiment.
- the applied power to the power transmitter 101 is 100W.
- the electromagnetic field of the room 201 between the power transmitter 101 and the power receiver 102 can be increased. Thereby, the power receiving body placed in the room 201 can receive power with high efficiency.
- a notebook computer 112 and a mobile phone 113 are placed inside the room 201.
- the notebook computer 112 is placed on the table 202.
- the mobile phone 113 is put in a bag 203.
- These power receivers can receive power from an electromagnetic field formed in a space (inside the room 201) using a coil provided in the same as in the first embodiment.
- the amount of power to be received is determined by a coil provided in each power receiving body, as in the first embodiment, and the rectifier circuit can receive power that meets its specifications.
- the magnetic field strength near the repeater coil 114 can be increased by adding the repeater coil 114. That is, it is possible to supply power more efficiently to the power receiver near the repeater coil 114.
- a notebook computer is used on a table or the like.
- the mobile phone is considered to be used by a standing or sitting user holding the mobile phone near the head.
- the repeater coil 114 is disposed at a position 1 m from the floor. Therefore, efficient power feeding is possible even when the notebook computer and the mobile phone are used as described above.
- the notebook computer 112 can obtain a power reception amount of 9 mW.
- the mobile phone 113 can obtain a power reception amount of 1.2 mW.
- FIG. 9 is a front view schematically showing the configuration of the wireless power feeding system 400 according to the fourth embodiment.
- the power transmitter 101 and the power receiver 102 are arranged side by side instead of facing each other.
- an electromagnetic field can be formed as in the case of opposing arrangement.
- Both the power transmitter 101 and the power receiver 102 are arranged side by side below the space 120.
- the magnetic field lines 110 that have emerged upward from the power transmitter 101 then proceed in the horizontal direction, and finally reach the power receiver 102 downward.
- the other configuration of the wireless power feeding system 400 is the same as that of the wireless power feeding system 100, and thus description thereof is omitted.
- the wireless power feeding system 400 by arranging the power transmitter 101 and the power receiver 102 side by side below the space 120, it is possible to limit the formation range of the electromagnetic field to the lower region of the space 120.
- a strong electromagnetic field can be formed in a specific region in the space 120 by performing power transmission using the phase difference of the electromagnetic waves transmitted from the power transmitter 101.
- the power receiving body 108 can be fed with high efficiency.
- FIG. 10 is a front view schematically illustrating a configuration example of the wireless power feeding system 4001 according to the fourth embodiment.
- the power transmitter 101 and the power receiver 102 are arranged side by side under the floor of the room 201.
- the resonance frequency of the power transmitter 101 and the power receiver 102 in the fourth embodiment is 1 MHz as in the first embodiment.
- the diameters of the coils of the power transmitter 101 and the power receiver 102 are 15 m.
- the coils of the power transmitter 101 and the power receiver 102 arranged in parallel are separated by 5 m in horizontal walking.
- the transmission efficiency of 90% or more can be secured in the space between the power transmitter 101 and the power receiver 102 as shown in FIG. This is the same not only when the two are arranged opposite to each other but also when they are arranged in parallel as shown in FIG.
- the coil types of the power transmitter 101 and the power receiver 102 are the same as those in the first embodiment.
- the applied power to the power transmitter 101 is 100W.
- the electromagnetic field in the space between the power transmitter 101 and the power receiver 102 can be increased. Thereby, the power receiving body placed in the room 201 inserted between them can receive power with high efficiency.
- the formed electromagnetic field can be limited to about 1 m from the floor surface. .
- the electromagnetic field strength in that region can be kept high.
- the notebook computer 112 and the mobile phone 113 are placed inside the room 201.
- the notebook computer 112 is placed on the table 202.
- the mobile phone 113 is put in a bag 203.
- These power receivers can receive power from an electromagnetic field formed in a space (inside the room 201) using a coil provided in the same as in the first embodiment.
- the amount of power to be received is determined by a coil provided in each power receiving body, as in the first embodiment, and the rectifier circuit can receive power that meets its specifications.
- the notebook computer 112 can obtain a power reception amount of 7 mW.
- the mobile phone 113 can obtain a power reception amount of 0.9 mW.
- FIG. 11 is a front view schematically showing the configuration of the wireless power feeding system 500 according to the fifth embodiment.
- the power transmitter 101 includes a plurality of power transmission primary coils 104 and a power transmission secondary coil 105.
- the power receiver 102 includes a plurality of power receiving secondary coils 106 and a power receiving primary coil 107.
- FIG. 11 an example in which the power transmitter 101 and the power receiver 102 each include two coils will be specifically described.
- the power transmitter 101 is disposed above the space 120.
- the power receiver 102 is disposed below the space 120.
- the other configuration of the wireless power feeding system 500 is the same as that of the wireless power feeding system 100, and thus the description thereof is omitted.
- the coil of the power receiver 108 can receive power from electromagnetic waves transmitted from the coils of the power transmitter 101.
- the distances between the coils of the power transmitter 101 and the power receiver 102 are different, if an in-phase electromagnetic wave is transmitted, the phase of the electromagnetic wave is shifted depending on the position of the power receiver 108, and the amount of power received, which is the sum of the electromagnetic waves, is small. There is a case. Therefore, the received power of the power receiver 108 is maximized by performing phase difference power supply in consideration of the distance difference to the power receiver 108.
- the electric field concentration region 115 can be formed by suitably performing the phase difference feeding.
- the wireless power feeding system 500 is incorporated in the entire floor of a building, if there is an atrium in the center of the floor, it is unlikely that the power receiver 108 exists in the atrium. In this case, it is possible to construct an efficient power supply environment by making settings such as weakening the electromagnetic field in the atrium and increasing the surrounding electromagnetic field.
- FIG. 12 is a front view schematically illustrating a configuration example of the wireless power feeding system 5001 according to the fifth embodiment.
- the power transmitter 101 two sets of the primary coil for power transmission 104 and the secondary coil for power transmission 105 are arranged side by side on the ceiling of the room 201.
- the power receiver 102 two sets of the power receiving secondary coil 106 and the power receiving primary coil 107 are arranged side by side under the floor of the room 201.
- the resonance frequency in the fifth embodiment is 1 MHz.
- the diameters of the coils of the power transmitter 101 and the power receiver 102 are 15 m. Note that the distance between the opposing power transmitter 101 and power receiver 102 is 5 m.
- the horizontal distance between the coils of the power transmitter 101 and the coils of the power receiver 102 arranged in parallel is 5 m.
- the types of coils included in the power transmitter 101 and the power receiver 102 are the same as those in the first embodiment.
- the applied power to each power transmitter 101 is 50W.
- the notebook computer 112 is placed inside the room 201.
- the notebook computer 112 is placed on the table 202. As shown in FIG. 12, the notebook computer 112 is placed in an area in the room 201 where the lines of magnetic force 110 are concentrated.
- the notebook personal computer 112 can receive power from an electromagnetic field formed in a space (inside the room 201) using a coil provided in itself, as in the first embodiment.
- the amount of power to be received is determined by a coil provided in each power receiving body, as in the first embodiment, and the rectifier circuit can receive power that meets its specifications.
- the notebook computer 112 Since the receiving coil of the notebook computer 112 is the same as that of the first embodiment, the description thereof is omitted. Under this condition, the notebook computer 112 can obtain a power reception amount of 8 mW.
- a wireless power feeding system 6001 according to the present embodiment is an application example of the wireless power supply system 100. That is, the wireless power feeding system 6001 performs batch power feeding to a plurality of electric vehicles.
- FIG. 13 is a front view schematically illustrating a configuration example of the wireless power feeding system 6001 according to the sixth embodiment. As shown in FIG. 13, in the wireless power feeding system 6001, a plurality of electric vehicles 205 are stored in a garage 204 corresponding to a space 120. These electric vehicles 205 correspond to the power receiver 108, and each electric vehicle 205 has a built-in power receiving coil (not shown).
- the resonance frequency in Example 6 is 1 MHz.
- the diameters of the coils of the power transmitter 101 and the power receiver 102 are 25 m.
- the distance between the power transmitter 101 and the power receiver 102 is 3 m.
- the types of coils included in the power transmitter 101 and the power receiver 102 are the same as those in the first embodiment.
- Example 6 it is possible to perform batch power supply to a plurality of electric vehicles 205.
- the garage 204 can be unmanned and a strong electromagnetic field can be formed to efficiently supply power to the electric vehicle 205.
- a strong electromagnetic field can be formed in the garage 204 by using superconducting coils for the coils of the power transmitter 101 and the power receiver 102.
- the wireless power supply system 6001 can be applied to, for example, collective power supply in a large garage to a commercial electric vehicle group (EV) such as a taxi or collective power supply in a storage garage to a rental electric bicycle. is there.
- EV commercial electric vehicle group
- this embodiment can be applied not only to electric vehicles but also to power supply to other transportation equipment driven by batteries and motors such as electric bicycles.
- a wireless power feeding system 7001 according to the present embodiment is an application example of the wireless power feeding system 100. That is, the wireless power feeding system 7001 performs batch power feeding to portable devices such as a wireless tag for authentication.
- FIG. 14 is a front view schematically illustrating a configuration example of the wireless power feeding system 7001 according to the seventh embodiment. As shown in FIG. 14, a wireless power feeding system 7001 stores a plurality of authentication wireless tags 207 in a power feeding box 206 corresponding to a space 120. These authentication wireless tags 207 correspond to the power receiver 108, and each authentication wireless tag 207 includes a power receiving coil (not shown).
- the resonance frequency in Example 7 is 10 MHz.
- the diameters of the coils of the power transmitter 101 and the power receiver 102 are 20 cm.
- the distance between the power transmitter 101 and the power receiver 102 is 15 cm.
- the types of coils included in the power transmitter 101 and the power receiver 102 are the same as those in the first embodiment.
- a plurality of authentication wireless tags 207 can be collectively fed. Therefore, when the authentication wireless tag 207 is not used, the authentication wireless tag 207 can be automatically charged simply by storing the authentication wireless tag 207 in the power supply box 206.
- the wireless power feeding system 7001 can be configured as a system that can be transported by human power. Accordingly, the wireless power feeding system 7001 can be moved as appropriate without being limited to a use place, or can be installed and used at an appropriate position indoors.
- the wireless power feeding system 7001 can be applied not only to the wireless tag for authentication 207 but also to applications such as a mobile phone, a portable music player, and a digital camera that can be stored in the power feeding box 206 for batch charging. Is possible.
- the wireless power supply system 100 enlarges the power supply box 206 to serve as a storage shelf, thereby collectively supplying power to a plurality of educational terminals and the like used in a school classroom using after school without classes. It can also be applied to cases.
- Embodiments 1 to 4 two or more power transmitters 101 and power receivers 102 may be arranged.
- three or more power transmitters 101 and power receivers 102 may be arranged.
- the number of power transmitters 101 and power receivers 102 may not be the same.
- the power transmitter 101 and the power receiver 102 may be provided with a plurality of coils. Further, the number of coils of the corresponding power transmitter 101 and power receiver 102 need not be the same.
- the primary coil for power transmission 104 and the secondary coil for power transmission 105 of the power transmitter 101 and the secondary coil for power reception 106 and the primary coil for power reception 107 of the power receiver 102 are composed of a linear conductor, a curved conductor, or a straight line and a curved line. It may be composed of a conductor.
- Each coil can be not only a general spiral type but also various types of coils such as a flat plate coil and a seal type.
- the primary coil for power transmission 104 and the secondary coil for power transmission 105 of the power transmitter 101, and the secondary coil for power reception 106 and the primary coil for power reception 107 of the power receiver 102 may be configured by an inductor and a capacitor.
- the power receiving body 108 may be provided with a plurality of power receiving coils 109. In the case where a plurality of power receiving coils are arranged on the power receiver, the power obtained by the power receiving coils can be combined and used as drive power for the power receiver.
- a notebook computer, a mobile phone, an electric vehicle, and an authentication wireless tag are given as examples of the power receiver, but the power receiver is not limited to these devices and devices.
- a device having a power receiving function including a coil can be configured as a power receiving unit and used by being mounted on devices and devices such as a notebook computer, a mobile phone, an electric vehicle, and an authentication wireless tag. By configuring such a power receiving unit, it can be mounted on various devices and devices.
- a power receiving unit can be mounted on an existing device or device as a retrofit.
- the power transmitter and the power receiver are arranged under the floor and behind the ceiling, but this is merely an example.
- the power transmitter and the power receiver can be installed on the floor and directly below the ceiling. In this case, it is possible to introduce a wireless power feeding system into a room that already exists by construction. It is also possible to install the power transmitter and the power receiver inside or outside the wall surface of the room or garage.
- the power transmitter and the power receiver can be installed inside the power supply box, or can be installed inside or outside the side wall of the power supply box.
- the power transmitter and the power receiver may be disposed across a plurality of rooms, or may be disposed over the entire floor in the building.
- the medium that fills the space 120 is not particularly limited.
- the space 120 may be a vacuum or may be filled with a specific gas such as air or nitrogen. It may also be filled with a liquid such as fresh water or sea water. That is, as long as the power receiving body 108 can be inserted into the space 120, the space 120 may be filled with a medium.
- the room 201, the garage 204, and the power supply box 206 corresponding to the space 120 have been described, but these are only examples. That is, the wireless power feeding system according to the above-described embodiment can be applied to any closed space structure such as a building and a box structure corresponding to the space 120.
- Wireless power feeding system 101
- Power transmitter 102
- Power receiver 103
- Power supply device 104
- Primary coil for power transmission 105
- Secondary coil for power transmission 106
- Secondary coil for power reception 107
- Primary coil for power reception 108
- Power receiving body 109
- Power reception coil 110
- Magnetic field line 111
- Laptop computer 113
- Mobile phone 114
- Repeater coil 115
- Electric field concentration area 120
- Space 201 Room 202 Table 203 Bag 204 Garage 205 Electric vehicle
- Electric vehicle 206
- Power supply box 207
- Authentication wireless tags 1001, 2001, 3001, 4001, 5001 , 6001, 7001 Wireless power supply system
Abstract
Description
まず、本発明の実施の形態1にかかる無線給電システム100について説明する。図1は、実施の形態1にかかる無線給電システム100の構成を模式的に示す正面図である。図1に示すように、無線給電システム100は、送電器101及び受電器102を有する。送電器101は、無線で電力を送電する装置である。受電器102は、送電器101からの電力を受電する装置である。無線給電システム100では、送電器101と受電器102との間の電力伝送により、送電器101と受電器102との間の空間に電磁場が形成される。つまり、送電器101と受電器102との間では、磁気共鳴により電力伝送が行われる。なお、図1には、無線給電システム100により生成される磁力線110を模式的に表示している。また、図1では、送電器101と受電器102との間で電磁波が伝送され、電磁場が形成されていることを示すために、代表として磁力線110を表示している。よって、送電器101と受電器102との間には磁力線110のみが存在するわけではない。以下、特に断らない限り、磁力線110は、上述のように、送電器101と受電器102との間の電磁場を表すものとして取り扱う。
本発明の実施例1にかかる無線給電システムについて説明する。実施例1は、無線給電システム100を建築物内の部屋に適用した場合の実施例である、無線給電システム1001にかかるものである。図4は、実施例1にかかる無線給電システム1001の構成例を模式的に示す正面図である。図4に示すように、送電器101は部屋201の天井裏に配置され、受電器102は部屋201の床下に配置される。図面の簡略化のため、図4では、磁力線110を破線で表示している。本実施例では、送電器101及び受電器102のコイルの直径は15m、コイル間の距離は5mである。また、共振周波数は1MHzである。送電用一次コイル104及び受電用一次コイル107は円形単層巻き、送電用二次コイル105及び受電用二次コイル106は円形スパイラル型で5.75回巻きのコイルを用いた。送電用一次コイル104と送電用二次コイル105との間、及び、受電用二次コイル106と受電用一次コイル107との間は、共鳴状態が最高となる距離で固定した。送電器101への印加電力は100Wである。実施例1では、コイル間の距離が5mであるので、図2に示す結果の通り、コイル間が17mである場合に比べ、コイル間の磁界エネルギーは大きくなる。
次に、本発明の実施の形態2にかかる無線給電システム200について説明する。無線給電システム200は、無線給電システム100の変形例である。図5は、実施の形態2にかかる無線給電システム200の構成を模式的に示す正面図である。図5に示すように、送電器101は空間120を囲むように配置される。無線給電システム200のその他の構成は、無線給電システム100と同様であるので、説明を省略する。
本発明の実施例2にかかる無線給電システムについて説明する。実施例2は、無線給電システム200を建築物内の部屋に適用した場合の実施例である、無線給電システム2001にかかるものである。図6は、実施例2にかかる無線給電システム2001の構成例を模式的に示す正面図である。図6に示すように、送電器101は部屋201の側壁を囲むように配置され、受電器102は部屋201の床下に配置される。実施例1と同様、実施例2における共振周波数は1MHz、送電器101及び受電器102のコイルの直径は、15mである。送電器101と受電器102とのコイル間の距離は、1.5mであり、実施例1と比べて、磁界エネルギーは大きくなる。なお、送電器101と受電器102が有するコイルの形式は、実施例1と同様である。送電器101への印加電力は100Wである。実施例2では、実施例1と同様に、送電器101と受電器102との間の部屋201内の電磁場を高めることができる。これにより、部屋201の内部に置かれた受電体は、高効率での受電が可能となる。
次に、本発明の実施の形態3にかかる無線給電システム300について説明する。無線給電システム300は、無線給電システム100の変形例である。図7は、実施の形態3にかかる無線給電システム300の構成を模式的に示す正面図である。図7に示すように、無線給電システム300は、無線給電システム100にリピーターコイル114を追加した構成を有する。リピーターコイル114は、電気的に浮遊している。
本発明の実施例3にかかる無線給電システムについて説明する。実施例3は、無線給電システム300を建築物内の部屋に適用した場合の実施例である、無線給電システム3001にかかるものである。図8は、実施例3にかかる無線給電システム3001の構成例を模式的に示す正面図である。図8に示すように、実施例3では、受電体の位置近傍の部屋側面(壁)に、リピーターコイル114が配置される。リピーターコイル114と受電器102との距離は、1mである。実施例1と同様、実施例3における共振周波数は1MHzである。送電器101及び受電器102のコイルの直径は15mであり、送電器101と受電器102とのコイル間の距離は5mである。送電器101と受電器102が有するコイルの形式及び大きさは、実施例1と同様である。送電器101への印加電力は100Wである。実施例3では、実施例1と同様に、送電器101と受電器102との間の部屋201の電磁場を高めることができる。これにより、部屋201の内部に置かれた受電体は、高効率での受電が可能となる。
次に、本発明の実施の形態4にかかる無線給電システム400について説明する。無線給電システム400は、無線給電システム100の変形例である。図9は、実施の形態4にかかる無線給電システム400の構成を模式的に示す正面図である。図9に示すように、無線給電システム400は、送電器101及び受電器102を対向配置ではなく、並べて配置している。一般に、磁界共鳴方式では、コイルを並列に配置しても、対向配置の場合と同様、電磁場を形成することができる。
次に、本発明の実施例4にかかる無線給電システムについて説明する。実施例4は、無線給電システム400を建築物の部屋に適用した場合の他の実施例である、無線給電システム4001にかかるものである。図10は、実施例4にかかる無線給電システム4001の構成例を模式的に示す正面図である。図10に示すように、送電器101及び受電器102は、部屋201の床下に並んで配置される。実施例4における送電器101及び受電器102の共振周波数は、実施例1と同様、1MHzである。送電器101及び受電器102のコイルの直径は、15mである。並列配置された送電器101及び受電器102のコイル間は、水平歩行に5m離隔している。コイル間の距離を5mとした場合、送電器101と受電器102との間の空間では、図2に示すように、90%以上の伝送効率を確保することができるが、これは2つのコイルが対向配置される場合だけでなく、図6のように並列に配置される場合でも同様である。
次に、本発明の実施の形態5にかかる無線給電システム500について説明する。無線給電システム500は、無線給電システム100の変形例である。図11は、実施の形態5にかかる無線給電システム500の構成を模式的に示す正面図である。図11に示すように、送電器101は、複数の送電用一次コイル104及び送電用二次コイル105を有する。受電器102は、複数の受電用二次コイル106及び受電用一次コイル107を有する。図11では、送電器101及び受電器102が、各コイルを2個ずつ有する例について具体的に説明する。
次に、本発明の実施例5にかかる無線給電システムについて説明する。実施例5は、無線給電システム500を建築物の部屋に適用した場合の他の実施例である、無線給電システム5001にかかるものであり。図12は、実施例5にかかる無線給電システム5001の構成例を模式的に示す正面図である。図12に示すように、送電器101では、2組の送電用一次コイル104及び送電用二次コイル105が、部屋201の天井裏に並んで配置される。受電器102では、2組の受電用二次コイル106及び受電用一次コイル107が、部屋201の床下に並んで配置される。実施例1と同様、実施例5における共振周波数は、1MHzである。送電器101及び受電器102のコイルの直径は、15mである。なお、対向する送電器101及び受電器102間の距離は、5mである。また、並列配置された送電器101のコイル同士及び受電器102のコイル同士の水平方向の距離は、5mである。送電器101及び受電器102が有するコイルの形式は、実施例1と同様である。各送電器101への印加電力はそれぞれ50Wである。
実施例6
次に、本発明の実施例6にかかる無線給電システムついて説明する。本実施例にかかる無線給電システム6001は、無線給電システム100の応用例である。すなわち、無線給電システム6001は、複数台の電気自動車に一括給電を行うものである。図13は、実施例6にかかる無線給電システム6001の構成例を模式的に示す正面図である。図13に示すように、無線給電システム6001は、空間120に相当する車庫204内に、複数台の電気自動車205が格納されている。これらの電気自動車205は受電体108に相当し、各電気自動車205には受電コイル(不図示)が内蔵されている。
次に、本発明の実施例7にかかる無線給電システムついて説明する。本実施例にかかる無線給電システム7001は、無線給電システム100の応用例である。すなわち、無線給電システム7001は、認証用無線タグ等の携帯可能な機器に一括給電を行うものである。図14は、実施例7にかかる無線給電システム7001の構成例を模式的に示す正面図である。図14に示すように、無線給電システム7001は、空間120に相当する給電箱206内に、複数個の認証用無線タグ207が格納されている。これらの認証用無線タグ207は受電体108に相当し、各認証用無線タグ207には受電コイル(不図示)が内蔵されている。
なお、本発明は上記実施の形態に限られたものではなく、趣旨を逸脱しない範囲で適宜変更することが可能である。例えば、実施の形態1~4において、送電器101及び受電器102は、それぞれ2個以上配置されていてもよい。また、実施の形態5においては、送電器101及び受電器102は、それぞれ3個以上配置されていてもよい。さらに、実施の形態1~5では、送電器101及び受電器102の個数は、同じでなくともよい。同様に、送電器101及び受電器102は複数のコイルが配置されてもよい。また、対応する送電器101及び受電器102のコイルの個数は同じでなくともよい。
101 送電器
102 受電器
103 電源装置
104 送電用一次コイル
105 送電用二次コイル
106 受電用二次コイル
107 受電用一次コイル
108 受電体
109 受電コイル
110 磁力線
111 帰還ループ
112 ノートパソコン
113 携帯電話
114 リピーターコイル
115 電界集中領域
120 空間
201 部屋
202 テーブル
203 カバン
204 車庫
205 電気自動車
205 電気自動車
206 給電箱
207 認証用無線タグ
1001、2001、3001、4001、5001、6001、7001 無線給電システム
Claims (18)
- 電磁波を発生させる送電器と、
電界又は磁界の共鳴現象を利用して前記送電器から受ける電磁波により電力が供給される受電器と、
前記送電器と前記受電器とにより形成される電磁場中に挿入され、前記電磁場により受電する受電体と、を備える、
無線給電システム。 - 前記受電体は、電磁誘導により前記電磁場から受電することを特徴とする、
請求項1に記載の無線給電システム。 - 前記受電器が受けた電力を前記送電器へ帰還させる、前記受電器と前記送電器とを結ぶ帰還ループを更に備えることを特徴とする、
請求項1又は2に記載の無線給電システム。 - 前記送電器と前記受電器とは、共振周波数が同じであることを特徴とする、
請求項1乃至3のいずれか一項に記載の無線給電システム。 - 前記送電器は、少なくとも1個の送電用コイルを備え、
前記受電器は、少なくとも1個の受電用コイルを備えることを特徴とする、
請求項1乃至4のいずれか一項に記載の無線給電システム。 - 前記送電器は、同一平面に沿って並列配置される複数の前記送電用コイルを備え、
前記受電器は、同一平面に沿って並列配置される複数の前記受電用コイルを備えることを特徴とする、
請求項5に記載の無線給電システム。 - 複数の前記送電用コイルが送出する電磁波は、それぞれ位相が異なることを特徴とする、
請求項6に記載の無線給電システム。 - 前記送電器と前記受電器とは、所定の距離で対向配置されることを特徴とする、
請求項5乃至7のいずれか一項に記載の無線給電システム。 - 前記送電器と前記受電器とは、同一平面に沿って並列配置されることを特徴とする、
請求項5乃至7のいずれか一項に記載の無線給電システム。 - 前記送電器と前記受電器との間に挿入されたリピーターコイルを更に有することを特徴とする、
請求項1乃至9のいずれか一項に記載の無線給電システム。 - 前記リピーターコイルは、前記送電器と前記受電器との間の磁力線に垂直な平面に沿って配置されることを特徴とする、
請求項10に記載の無線給電システム。 - 前記リピーターコイルは、電気的に浮遊していることを特徴とする、
請求項10又は11に記載の無線給電システム。 - 前記受電体は、少なくとも1個の受電用コイルを備えることを特徴とする、
請求項1乃至12のいずれか一項に記載の無線給電システム。 - 前記受電体は、他の機器に組む込み可能な受電ユニットとして構成され、
組み込まれる他の機器に電力を供給することを特徴とする、
請求項1乃至13のいずれか一項に記載の無線給電システム。 - 複数の前記受電体が、前記送電器と前記受電器とにより形成される前記電磁場中に挿入されることを特徴とする、
請求項1乃至14のいずれか一項に記載の無線給電システム。 - 前記送電器と前記受電器との間に配置された、閉空間構造物を更に備え、
前記閉空間構造物の内部には、複数の前記受電体が挿入されることを特徴とする、
請求項1乃至14のいずれか一項に記載の無線給電システム。 - 複数の前記受電体は、一括して電力の供給を受けることを特徴とする、
請求項15又は16に記載の無線給電システム。 - 送電器と受電器との間に、電界又は磁界の共鳴現象を利用して電磁場を発生させ、
前記電磁場中に受電体を挿入することにより、前記受電体に受電させる、
無線給電方法。
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