WO2014030773A1 - Dispositif d'alimentation électrique - Google Patents

Dispositif d'alimentation électrique Download PDF

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Publication number
WO2014030773A1
WO2014030773A1 PCT/JP2013/073237 JP2013073237W WO2014030773A1 WO 2014030773 A1 WO2014030773 A1 WO 2014030773A1 JP 2013073237 W JP2013073237 W JP 2013073237W WO 2014030773 A1 WO2014030773 A1 WO 2014030773A1
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Prior art keywords
coil
power
power supply
coils
loaded
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PCT/JP2013/073237
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English (en)
Japanese (ja)
Inventor
小林　直樹
福田　浩司
義哲 成末
圭博 川原
浅見　徹
Original Assignee
日本電気株式会社
国立大学法人東京大学
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Application filed by 日本電気株式会社, 国立大学法人東京大学 filed Critical 日本電気株式会社
Priority to JP2014531693A priority Critical patent/JP6270219B2/ja
Publication of WO2014030773A1 publication Critical patent/WO2014030773A1/fr

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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
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
    • 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
    • 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

Definitions

  • the present invention relates to a power supply device, and more specifically to a device that supplies power to a power receiving device in a contactless manner without going through a power transmission line.
  • Patent Document 1 discloses a configuration in which an electromagnetic wave is propagated in an electromagnetic wave transmission sheet and an electromagnetic field leaking from the electromagnetic wave transmission sheet is supplied to a power receiving device.
  • Patent Document 3 discloses a method of transmitting power by magnetic coupling from a primary coil on the power source side to a secondary coil on the load side.
  • Patent Document 5 discloses a power transmission method using a microwave beam.
  • Non-Patent Document 1 This concept is cited from the disclosure by Non-Patent Document 2.
  • Power is supplied to a plurality of electronic devices arranged in an area having
  • the electronic device here includes, for example, a power transmission sheet, and the power transmission sheet can be used to supply power to a small electronic device.
  • a plurality of coils 14 are arranged in a plane and embedded in a wall or floor 13 of room 10. And it utilizes that the coils which adjoin in the direction orthogonal to a central axis also resonate. That is, if power is supplied to one of the coils, the electric power hops to the adjacent coil. Electric power is propagated to the adjacent coil, and an electromagnetic field is leaked from the coil into the room 10.
  • JP 2008-66841 A JP 2007-281678 A JP-A-7-322534 US Patent No. 7,825,543 JP 2008-259392 A
  • An object of the present invention is to provide a power supply device that can supply power efficiently without depending on the position of the power receiving device in wireless power feeding.
  • a plurality of coils are arranged one-dimensionally, two-dimensionally or three-dimensionally, and electric power is propagated to the adjacent coil by a resonance action, and an electromagnetic field leaks to the surroundings.
  • a power transmission unit that performs power transmission wirelessly, a power feeding unit that supplies power to one or a plurality of the coils of the power transmission unit, and a power receiving device that receives power transmitted from the power transmission unit.
  • One or more coils arranged in an original or two-dimensional or three-dimensional manner are loaded with reactive elements.
  • FIG. 1 is a perspective view showing two configuration examples of a power supply apparatus to be realized by the present invention.
  • FIG. 2 is a diagram for showing that a substantially uniform magnetic field distribution (a soot current distribution) is generated in a plurality of coils arranged one-dimensionally.
  • FIG. 3 is a diagram showing an example in which N coils are arranged on a two-dimensional plane.
  • FIG. 4 is a diagram showing that a reactive element is loaded in parallel on a helical coil as shown in FIG.
  • FIG. 5 is a diagram showing an example in which a reactive element is loaded in series on a helical coil as shown in FIG. 1 (FIG. 5a) and an example in which a reactive element is loaded on one end of the helical coil.
  • FIG. 5 is a diagram showing an example in which a reactive element is loaded in series on a helical coil as shown in FIG. 1 (FIG. 5a) and an example in which a reactive element is loaded on one end of the helical coil
  • FIG. 6 is a diagram showing that six coils (coil 1 to coil 6) are surrounded by coil 0, and that capacitive elements are loaded in parallel to each coil. The load resistance is connected to the power receiving coil (power receiving device).
  • FIG. 7 is a characteristic diagram showing the result of analyzing the circuit model of FIG. 6 and analyzing the power transmission efficiency.
  • FIG. 8 is a diagram showing the first embodiment of the present invention in two examples of a one-dimensional coil arrangement (FIG. 8a) and a two-dimensional coil arrangement (FIG. 8b).
  • FIG. 9 is a diagram showing a second embodiment of the present invention with two examples of a one-dimensional coil arrangement (FIG. 9a) and a two-dimensional coil arrangement (FIG. 9b).
  • FIG. 9 is a diagram showing a second embodiment of the present invention with two examples of a one-dimensional coil arrangement (FIG. 9a) and a two-dimensional coil arrangement (FIG. 9b).
  • FIG. 10 is a diagram showing that a reactive element is loaded on a one-turn loop coil used in the present invention.
  • FIG. 11 is a view showing an example of a planar spiral coil (FIG. 11a) used in the present invention and an example of a coil mounted on the back surface of the printed board.
  • FIG. 12 is a functional block diagram showing a configuration example of a loaded reactance calculation apparatus which is a part of the power supply apparatus according to the third embodiment of the present invention.
  • FIG. 13 is a functional block diagram showing a configuration example of a loaded reactance calculation apparatus which is a part of the power supply apparatus according to the fourth embodiment of the present invention.
  • FIG. 14 shows another embodiment of the present invention in two examples: a one-dimensional coil arrangement (FIG.
  • FIG. 14a a two-dimensional coil arrangement
  • FIG. 14b a two-dimensional coil arrangement
  • FIG. 15 is a view showing still another embodiment (three-dimensional coil arrangement) of the present invention.
  • FIG. 16 is a diagram showing several examples of reactive elements used in the present invention.
  • FIG. 17 is a diagram for explaining the concept of conventional multi-hop power transmission.
  • FIG. 18 is a diagram for explaining electromagnetic field simulation applied to a two-dimensional power supply system in which nine square loop coils are laid.
  • FIG. 19 is a diagram for explaining a capacitor loading position in one loop coil of FIG. 18 and a feeding point in the power transmission resonator.
  • FIG. 20 is a diagram for describing the magnitude of the impedance of the mutual inductance between the adjacent resonators in the two-dimensional power feeding system shown in FIG.
  • FIGS. 21A to 21D are diagrams for explaining the magnitude of the impedance of the mutual inductance with respect to the resonator interval different from those in FIGS.
  • FIG. 22 is a diagram simulating a photograph of the measurement result of the electric field intensity distribution by the loop coil arrangement shown in FIG.
  • FIG. 23 is a diagram simulating a photograph of the measurement result of the magnetic field strength distribution by the loop coil arrangement shown in FIG.
  • FIG. 1 shows a configuration example of a main part of a power supply apparatus to be realized by the present invention.
  • the power receiving device 120 is not in electrical contact with the power transmission unit 110.
  • the power transmission unit 110 includes a plurality of coils 111, and the plurality of coils 111 are arranged one-dimensionally (linearly or curvilinearly) (FIG. 1a) or two-dimensionally (planarly) (FIG. 1b). ing.
  • a helical coil or a spiral coil is typical as the coil 111.
  • the coil 111 is a helical coil.
  • the power transmission unit 110 may be, for example, a room wall or a floor itself.
  • a plurality of coils 111 may be embedded in one surface of the floor, wall, or ceiling 115 of the room and used as the power transmission unit 110.
  • the material of the floor, wall, or ceiling 115 may be anything as long as it does not impair the function as the power transmission unit.
  • the power feeding device 130 supplies power to one or a plurality of coils 111.
  • An alternating current may flow from the power feeding device 130 to the coil 111.
  • an oscillating magnetic field may be applied to the coil 111. In this configuration, when power is supplied from the power supply device 130 to one or a plurality of coils 111, the power propagates between adjacent coils in the power transmission unit 110.
  • the current of the coil is represented by ⁇ i I.
  • ⁇ TX angular frequency
  • M ik is a mutual inductance between the coil i and the coil k. This equation is an equation that is established approximately when the capacitive coupling between different coils is negligibly small.
  • equation (2) is established.
  • This condition is a relational expression that is satisfied among the current distributions ⁇ 1 I, ⁇ 2 I,..., ⁇ N I for each coil when the entire coil distribution is excited as a specific resonance mode when the power feeding unit is connected.
  • the imaginary part of the impedance is represented by the following formula (3).
  • the value of Im (Z i ( ⁇ TX )) is ⁇ TX L i ⁇ (1 / ⁇ TX C), which is not necessarily expressed by the formula ( It does not necessarily satisfy 3).
  • an element having a specific impedance value can be loaded on the coil i so as to satisfy the expression (3).
  • the reactance value of the reactive element to be loaded is X i
  • the reactance value to be loaded is represented by the following equation (4).
  • X i is a positive value
  • an inductive reactive element that is, an inductor
  • a capacitive reactive element that is, a capacitor
  • an inductor having an inductance value satisfying the following expression (5) may be loaded.
  • a capacitor if the capacitance value is Ci , add , a capacitor having a capacitance value satisfying the following expression (6) may be loaded.
  • an element having an inductance value L i, add obtained by the equations (5) and (6) or a value as close as possible to C i, add may be obtained or manufactured and loaded.
  • the current distribution of the plurality of coils of the power transmission unit 110 can be a desired distribution.
  • both terminals of the reactive element 301 may be connected to both ends of the coil 111 as shown in FIG.
  • the parasitic capacitance of the coil cannot be ignored, it indicates that there is a capacitance between both ends of the coil. Therefore, as shown in FIG.
  • the terminals of the conductive element 301 may be connected in series. Alternatively, as shown in FIG.
  • a terminal on one side of the reactive element 301 may be loaded at the end of the coil.
  • the reactive element 301 to be loaded is not necessarily limited to either an inductor or a capacitor, and may include both of them.
  • the capacitive element C i, the parasitic inductance of the add L i, and para, C i satisfying the following equation (7), add, L i may be loaded with a reactive element having a para.
  • the effectiveness of the method according to the present invention will be shown using circuit analysis.
  • the current for each coil of the power transmitting unit is made uniform. As shown in FIG.
  • the power feeding device 130 feeds power to the coil number 1.
  • the power receiving unit is assumed to move in the horizontal direction and is not taken into consideration during design. All coils shall be used with capacitors mounted on loop coils. All the coils of the power transmission unit 110 have the same structure, the inductance is 1 ⁇ H, the loss resistance is 0.5 ⁇ , and the self-capacitance value is negligible. ⁇ i of all the coils was set to 1 so that the currents of all the coils were equal.
  • the coupling constant between the coil of the power receiving unit and the coil of the power transmitting unit 110 immediately below it is 0.3.
  • power was supplied to the coil of No. 1, and the internal resistance of the power supply device 130 was ignored.
  • the horizontal axis represents each coil number of the power transmission unit 110, and the vertical axis represents power transmission efficiency.
  • the transmission efficiency in the case of having a conventional method, that is, 137.8 pF so that all the coils of the power transmission unit self-resonate at 13.56 MHz is also shown.
  • FIG. 7 shows that the method proposed in the present invention can realize stable power transmission regardless of the position of the power receiving unit.
  • FIG. 8 is a perspective view of the power supply apparatus according to the first embodiment of the present invention.
  • FIG. 8A shows a case where a plurality of coils 811 of the power transmission unit 110 are arranged in a one-dimensional shape (row shape).
  • FIG. 8B shows a case where the plurality of coils 811 of the power transmission unit 110 are two-dimensional. This is a case where they are arranged in a (planar) form.
  • the coil 811 is cut in the middle of the coil wiring and loaded with the reactive element 301 as in the coil 111 of FIG. 5A.
  • the reactance value of the reactance element 301 is a value (substantially equal) that is very close to a value that satisfies the relational expression that satisfies the above formula (4).
  • Each reactive element 301 may be loaded on the coil tip as shown in FIG. Furthermore, the reactive element may be loaded in parallel with the coil as shown in FIG. 4, or a plurality of reactive elements may be loaded in parallel with the coil. Further, each reactive element may be a capacitive element or an inductive element.
  • FIG. 9 is a perspective view of a power supply apparatus according to the second embodiment of the present invention. In FIG. 9, each of the plurality of coils of the power transmission unit 110 is a single loop coil 911. FIG.
  • FIG. 9A shows a case where a plurality of loop coils 911 are arranged in a one-dimensional manner
  • FIG. 9B shows a case where a plurality of loop coils 911 are arranged in a two-dimensional manner.
  • the reactive element 301 is loaded in series on the loop 911 in the middle of the coil, like the loop coil 1011 shown in FIG.
  • the reactance value of the reactance element 301 is a value (substantially equal) that is very close to a value that satisfies the relational expression that satisfies the above formula (4).
  • a plurality of reactive elements may be loaded in series with the coil. Further, each reactive element may be a capacitive element or an inductive element.
  • the power receiving unit (power receiving device) 912 may be a one-turn loop coil as shown in FIG. 9 or a multi-turn loop coil.
  • the helical type or one-loop type coil is exemplified.
  • a planar spiral coil shown in FIG. 11A may be used as the coil.
  • the planar spiral coil 1101 has an advantage that it can be mounted on a conventional printed circuit board. That is, one spiral coil 1101 may be mounted on the front surface or the back surface of the printed board. Alternatively, planar spiral coils may be mounted on both sides of the printed board. For example, the planar spiral coil 1101 of FIG.
  • FIG. 11A is mounted on the front side of the printed circuit board, and the coil 1102 of FIG. 11B is mounted on the back surface of the printed circuit board.
  • FIG. 11B is a perspective view of the coil 1102 mounted on the back surface of the printed circuit board from the front surface side.
  • the parallel loading type required in the present invention is obtained by connecting the front end portions of the front side coil 1101 and the rear side coil 1102 which are not connected to each other with a reactive element while leaving the conductor connection as it is.
  • the reactive element can be configured.
  • the reactive element may be embedded in the front side coil 1101 or in the back side coil 1102.
  • various types of spiral conductors can be mounted on the multilayer board by using the spiral conductors of each layer and the conductors connecting the layers.
  • various capacitive element loaded spiral conductors can be mounted on the multilayer substrate by the spiral conductor of each layer and the reactive element connecting the layers.
  • the reactive element may be embedded in the front side coil or in the back side coil.
  • FIGS. 11A and 11B a spiral coil having a rectangular shape and each side of the rectangle being linear is illustrated, but it goes without saying that it may be a curved spiral.
  • the spiral coil may be mounted on the high dielectric substrate.
  • a spiral coil may be mounted on the magnetic material. Thereby, a magnetic flux density can be raised and size reduction of a coil can be achieved.
  • the coil of the power transmission unit may be sandwiched between two rigid boards so that the power transmission unit does not bend.
  • the power transmission unit may be bent flexibly by sandwiching the resonator (coil) of the power transmission unit between two flexible sheets. (Third embodiment) FIG.
  • the reactance calculation apparatus includes a circuit constant input unit 1201, a desired current distribution input unit 1202, a frequency input unit 1203, a loading element reactance calculation unit 1204, and a loading element reactance display unit 1205.
  • the circuit constant input unit 1201 includes an input unit that inputs information on the plurality of coils of the power transmission unit 110 described above.
  • the circuit constant input unit 1201 includes an input unit that inputs values of self-inductance, self-capacitance of each coil, and mutual inductance (or coupling constant) between the coils.
  • Desired current distribution input section 1202 includes an input section for inputting a desired current value that is desired to flow for each coil.
  • the frequency input unit 1203 includes an input unit that inputs a use frequency.
  • the loading element reactance calculation unit 1204 receives, as input information, information about a plurality of coils from the circuit constant input unit 1201, information about the current from the desired current distribution input unit 1202, and information about the frequency from the frequency input unit 1203. 4), or a calculation unit that calculates a reactance value, an inductance value, or a capacitance value to be loaded on each coil in accordance with Equation (5) or Equation (6).
  • the loading element reactance display unit 1205 includes a display unit that displays the reactance value, inductance value, or capacitance value calculated by the loading element reactance calculation unit 1204.
  • a display unit that displays the reactance value, inductance value, or capacitance value calculated by the loading element reactance calculation unit 1204.
  • FIG. 13 is a block diagram functionally showing a reactance calculation apparatus which is a part of the power supply apparatus according to the fourth embodiment of the present invention.
  • the reactance calculation apparatus includes a coil structure, a material, position information, and a calculation frequency band input unit 1301, a desired current distribution input unit 1202, a frequency input unit 1203, a circuit constant calculation unit 1302, a loading element reactance calculation unit 1204, a loading element.
  • the coil structure, material, position information, and calculation frequency band input unit 1301 are provided with the structure of the plurality of coils of the power transmission unit 110, the material constituting the coil, the position information of each coil, and the power supply apparatus.
  • the input part which inputs the information regarding the background material (The material of a wall and a floor if it says in FIG. 17) which comprises the environment performed is included.
  • Desired current distribution input section 1202 includes an input section for inputting a desired current value that is desired to flow for each coil.
  • the frequency input unit 1203 includes an input unit that inputs a use frequency.
  • the circuit constant calculation unit 1302 includes a calculation unit that receives various information from the input unit 1301 of the coil structure, material, position information, and calculation frequency band and calculates a circuit constant using an electromagnetic field simulator.
  • the circuit constant includes a reactance value, an inductance value, or a capacitance value for each coil, and a mutual inductance or a coupling coefficient between the coils.
  • the loading element reactance calculation unit 1204 receives as input information the circuit constant calculated by the circuit constant calculation unit 1302, the information about the current from the desired current distribution input unit 1202, and the information about the frequency from the frequency input unit 1203. Or a calculation unit for calculating a reactance value, an inductance value, or a capacitance value to be loaded on each coil according to the equation (5) or the equation (6).
  • the loading element reactance display unit 1205 is a display unit that displays the reactance value to be loaded of each coil calculated by the loading element reactance calculation unit 1204. In the fourth embodiment of the present invention, it is assumed that an element corresponding to the reactance value, inductance value, or capacitance value displayed by the reactance calculation device is loaded on each coil.
  • the circuit constant calculation unit 1302 includes a calculation unit that calculates a circuit constant using an electromagnetic field simulator.
  • the electromagnetic field simulator generally has a function of automatically performing simulation simulating electromagnetic propagation in an actual structure and extracting circuit constants such as impedance.
  • Non-patent document 3 shows a description of electromagnetic field analysis and a method for calculating circuit constants.
  • FIG. 18 A three-dimensional electromagnetic field analysis simulator FEKO was used as the electromagnetic field simulator.
  • FIG. 18 An analysis was performed on a two-dimensional power supply system in which nine square loop coils were laid. From the obtained simulation results, it was confirmed that the current value was within an error of 2.6%. It was also confirmed that the magnetic field distribution became more uniform as the distance from the electromagnetic wave transmission sheet increased.
  • the adjacent loop coils are shown apart from each other in order to emphasize the feature of the present invention. However, the interval between the adjacent loop coils is actually very small. The same applies to FIGS.
  • the shape of the loop coil was a square with a side of 20 cm, and the material was a copper wire with a radius of 1 mm.
  • the loading position of the capacitor as the reactive element and the feeding point in the power transmission resonator are indicated by arrows in FIG.
  • the analysis space was a free space and the analysis frequency was 13.56 MHz.
  • each loop coil is laid out to the same extent as the contact, the distance between adjacent loop coils is set to 0.5 mm. That is, the center-to-center distance between adjacent loop coils is 20.15 cm including one side of the loop coil 20 cm and the wire diameter 1 mm.
  • the magnitude ⁇ M of the impedance of the mutual inductance between adjacent resonators was 11.058 ⁇ as shown in FIG. Subsequently, ⁇ M at other intervals was obtained by simulation. The results are shown in FIGS. 21A to 21D. When the capacitance to be loaded is calculated from these values, the central loop coil among the nine is 511.1 pF, the loop coils at the four corners are 245.2 pF, and the remaining four are 326.9 pF.
  • FIG. 22 shows the electric field strength distribution of the loop coil arrangement shown in FIG. 18, and FIG. 23 shows the magnetic field strength distribution.
  • the d of the caption is the height from the loop coil.
  • M ik represents the mutual inductance between the coil i and the coil k (k ⁇ i), but the mutual inductance value for all the coils k other than the coil i.
  • M ik represents the mutual inductance between the coils i and the coil k (k ⁇ i), but the mutual inductance value for all the coils k other than the coil i.
  • the mutual inductance between the coil not adjacent to the coil i and the coil i may be regarded as zero.
  • air is generally between the power transmission unit and the power receiving device, but water, seawater, earth, sand, a wall, and a dielectric may be provided between the power transmission unit and the power reception device.
  • the power transmission unit 110 may be an antenna for an RFID (Radio Frequency Identification) reader.
  • the power receiving device 120 may be an RFID tag.
  • the power receiving apparatus may be a moving object such as a robot, such as a self-propelled floor cleaner, or an autonomous submarine.
  • the openings of the coils 811 of the power transmission unit 110 May not necessarily face the power receiving device 120 side.
  • the direction of the opening part of the some coil 811 of the power transmission part 110 may be inconsistent.
  • the plurality of coils 811 of the power transmission unit 110 may be arranged in a three-dimensional manner. At this time, the power receiving device 120 may be outside or inside the three-dimensional arrangement of the plurality of coils.
  • the reactance element 301 may be a variable impedance element 1601 can be controlled by an external signal V c (Fig. 16b). At this time, to the external signal V c may be controlled by a wire cable, it may be controlled by a wireless signal.
  • the variable impedance element 1601 may include a variable capacitance element 1602 (FIG. 16c). The variable capacitance element may be realized using a diode. Further, the variable impedance element 1601 may include a variable inductance element 1603 (FIG. 16d).
  • variable inductance element 1603 may be realized by a combination of a passive inductor and a variable capacitance element 1602 (FIG. 16c).
  • the variability of the variable inductance element 1603 may be realized by controlling the positional relationship between the passive inductor and the magnetic material with a control signal.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention a trait à une unité de transmission d'énergie qui est conçue en agençant de façon unidimensionnelle ou bidimensionnelle une pluralité de bobines, laquelle unité de transmission d'énergie transmet de l'énergie par radio en propageant l'énergie vers les bobines adjacentes grâce au couplage électromagnétique et aux fuites d'un champ électromagnétique vers les environs. Un bloc d'alimentation fournit de l'énergie à une ou plusieurs des bobines de l'unité de transmission d'énergie. Une unité de réception d'énergie reçoit l'énergie transmise par l'unité de transmission d'énergie. Une ou plusieurs bobines de la structure d'agencement de bobines unidimensionnel ou bidimensionnel dans l'unité de transmission d'énergie sont chacune chargée au moyen d'un élément réactif.
PCT/JP2013/073237 2012-08-24 2013-08-23 Dispositif d'alimentation électrique WO2014030773A1 (fr)

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JP2018102093A (ja) * 2016-12-21 2018-06-28 清水建設株式会社 無線電力伝送システムおよび無線電力伝送方法
JP2018102092A (ja) * 2016-12-21 2018-06-28 清水建設株式会社 無線電力伝送システム
KR20190047229A (ko) * 2017-10-27 2019-05-08 한국철도기술연구원 냉동컨테이너용 무선전력전송 구조
US10819007B2 (en) 2015-05-21 2020-10-27 Sharp Kabushiki Kaisha Display device
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JP2012075304A (ja) * 2010-08-30 2012-04-12 Univ Of Tokyo 無線電力伝送装置

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JP2011259585A (ja) * 2010-06-08 2011-12-22 Tokai Rika Co Ltd 車両用給電装置
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
US10819007B2 (en) 2015-05-21 2020-10-27 Sharp Kabushiki Kaisha Display device
KR101771804B1 (ko) * 2015-09-25 2017-08-25 삼성전기주식회사 무선 전력 송신 장치 및 그를 이용한 공진 주파수 제어 방법
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JP2018102093A (ja) * 2016-12-21 2018-06-28 清水建設株式会社 無線電力伝送システムおよび無線電力伝送方法
JP2018102092A (ja) * 2016-12-21 2018-06-28 清水建設株式会社 無線電力伝送システム
KR20190047229A (ko) * 2017-10-27 2019-05-08 한국철도기술연구원 냉동컨테이너용 무선전력전송 구조
KR102037876B1 (ko) * 2017-10-27 2019-10-30 한국철도기술연구원 냉동컨테이너용 무선전력전송 구조
JP2021521766A (ja) * 2018-04-20 2021-08-26 イーサーダイン テクノロジーズ インコーポレイテッドＥｔｈｅｒｄｙｎｅ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｉｎｃ ワイヤレス電力伝送送信機および受信デバイスを内蔵したタイル
JP7394069B2 (ja) 2018-04-20 2023-12-07 イーサーダイン テクノロジーズ インコーポレイテッド ワイヤレス電力伝送送信機および受信デバイスを内蔵したタイル

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