JP2013110805A - Non-contact power supply system and power supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable long range power supply without requiring resonance frequency control of a power receiving body in a non-contact power supply system.SOLUTION: A power transmitter 101 generates a magnetic field at a first frequency and a power receiver 102 resonates the magnetic field of the first frequency and amplifies the magnetic field of the first frequency. A resonance frequency of a power receiving body 108 is different from the first frequency and the power receiving body 108 receives power by electromagnetic induction of the magnetic field of the first frequency amplified by at least the power receiver 102. The power receiving body 108 receives power by electromagnetic induction from the magnetic field formed by the power transmitter 101 and the power receiver 102 so that the power receiving body 108 can supply power in long range between the power transmitter 101 and the power receiver 102 without requiring the resonance frequency control of the power receiving body.

Description

  The present invention relates to a non-contact power feeding system and a power feeding method.

The electromagnetic induction method is a method of sending electric power using an induced magnetic flux generated between a power transmission side and a power reception side coil. It originated in the discovery of Faraday's law in 1831, and in 1836 a transformer was invented. In recent years, it has been applied to various products, taking advantage of the effect of enhancing waterproofness, such as being used in battery chargers for electric toothbrushes and shavers. This technology is also called a non-contact charging technology, and in many cases, the transmission distance is several millimeters (mm) or less and the operating frequency is several hundred kilohertz (kHz) or less. In addition, the amount of transmitted power in the electromagnetic induction system depends on the design.
This electromagnetic induction system is characterized in that the transmission distance is short and the influence of leakage of the magnetic field on the surroundings is small.

  The magnetic resonance method was proposed by the Massachusetts Institute of Technology (MIT) in 2006 and disclosed in Patent Document 1. In this method, two coils are disposed on each of the power transmission side and the power reception side, and each inductance (L) is increased to generate a resonance phenomenon, which is a long-distance and higher-efficiency power than the electromagnetic induction method. Power transmission is realized.

  According to Non-Patent Document 1, a resonance frequency of 10 megahertz (MHz) is used, and an inter-coil transmission efficiency of 45% is achieved for an inter-coil distance of 2 meters (m). The transmission efficiency of the entire power transmission system is about 15% because it is the total product including the efficiency of 37.5% of the power transmission device (mainly amplifier) and the efficiency of 90% of the power reception device (mainly rectifier). That is, a transmission power of 400 watts (W) is input, and a 60-watt lamp 2 meters ahead is turned on. As described above, the magnetic resonance method is characterized in that power can be supplied with a relatively high efficiency up to a long distance as compared with a general electromagnetic induction method. However, the feeding distance is a range in which the magnetic flux reaches between the transmitting and receiving coils, and the range is generally about 1/20 (1/20) of the resonance wavelength. In the above experiment, one wavelength for a frequency of 10 megahertz is 60 meters, and 1/20 of that is about 3 meters. Since this transmission distance substantially coincides with the diameter of the power transmission / reception coil, in other words, the effective transmission distance of the magnetic field resonance method is about the diameter of the power transmission / reception coil.

  The market expectation for wireless power feeding technology such as this magnetic resonance method is that power can be easily transmitted wirelessly to places where electricity has not arrived or where it has been difficult to deliver. One of the usage scenes is in piping. Various pipes such as water distribution pipes, power distribution pipes, fiber optic cable pipes, etc. are installed in the basement of the city or in buildings, etc., and there are various sensing needs such as water volume, water contamination, power consumption, cable temperature, etc. is there. For this purpose, it is necessary to dispose a sensor in the pipe, and there is a demand for means for simply supplying power to the pipe from outside the pipe.

For example, Patent Documents 2 and 3 disclose a technique for supplying power into a pipe using an electromagnetic induction method with respect to the use scene. Among them, a magnetic shield (synthetic rubber sheet, ferrite, etc.) is placed in the vicinity of a wireless power transmitter using an electromagnetic induction method to reduce the influence of the piping wall and transmit power to the power receiver (coil) in the piping. Technology is disclosed.
Patent Document 4 discloses a technique in the case of a plurality of power receivers in the magnetic field resonance method. In this patent document, there is disclosed a configuration in which two or more power receiving devices are provided for the magnetic resonance type main power transmitting device, and an auxiliary power receiving device for collecting power is separately provided. Here, 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.

Andr é Kurs and 5 others, "Wireless Power Transfer via Strongly Coupled Magnetic Resonances", Science, July 6, 2007, Vol. 317, no. 5834, p. 83-86

Special table 2009-501510 JP 2010-246348 A JP 2009-022126 A Japanese Patent Application No. 2009-87596

Since the magnetic field resonance method uses a resonance phenomenon, it is essential to match the resonance frequencies of the power transmitter side and the power receiver side. When the resonance condition is not met, the power transmission efficiency is greatly reduced. Therefore, for example, when there are a plurality of power receivers, a mechanism for correcting changes in resonance conditions due to the power reception state of each power receiver and the relative distance from the power transmitter is necessary. The resonance condition also changes depending on the ambient temperature around the power transmitter / receiver. As described above, when power is transmitted by the magnetic field resonance method, it is necessary to perform advanced control of the resonance frequency in consideration of the environment such as temperature and the number of power receivers. However, for example, when the power receiver is in a closed space such as a pipe, it may be difficult to appropriately control the resonance frequency.
On the other hand, the electromagnetic induction method does not require advanced control of the resonance frequency, but has a short transmission distance. Therefore, the electromagnetic induction method is not suitable when the power transmitter and the power receiver are separated.

  An object of the present invention is to provide a non-contact power feeding system and a power feeding method that can solve the above-described problems.

  The present invention has been made to solve the above-described problems. A contactless power feeding system according to one aspect of the present invention includes a power transmitter that transmits power by generating a magnetic field at a first frequency, and the first frequency. A resonator that amplifies the magnetic field of the first frequency by resonating with the magnetic field of the first and electromagnetic induction by at least the magnetic field of the first frequency amplified by the resonator, the resonance frequency being different from the first frequency And a power receiver capable of receiving power at.

  The power feeding method according to one aspect of the present invention is a power feeding method for a non-contact power feeding system, in which a power transmitter transmits power by generating a magnetic field at a first frequency, and a resonator includes the first power source. A resonance step of resonating with a magnetic field of one frequency and amplifying the magnetic field of the first frequency, and a power receiver having a resonance frequency different from the first frequency, wherein the first resonator amplified by at least the resonator And a power receiving step for receiving power by electromagnetic induction using a magnetic field having a frequency.

  According to the present invention, it is possible to perform power supply over a longer distance without requiring resonance frequency control of the power receiver.

It is explanatory drawing which shows the outline of a structure of the non-contact electric power feeding system in the 1st Embodiment of this invention, and the outline of arrangement | positioning of each part. It is a graph which shows an example of the three-dimensional simulation result of the magnetic field formation in the space by a magnetic field resonance system. It is explanatory drawing which shows the outline of a structure of the non-contact electric power feeding system in the 2nd Embodiment of this invention, and the outline of arrangement | positioning of each part. It is explanatory drawing which shows the outline of a structure of the non-contact electric power feeding system in the 3rd Embodiment of this invention, and the outline of arrangement | positioning of each part. It is explanatory drawing which shows the outline of a structure of the non-contact electric power feeding system in the 4th Embodiment of this invention, and the outline of arrangement | positioning of each part. It is explanatory drawing which shows the outline of a structure of the non-contact electric power feeding system in the 5th Embodiment of this invention, and the outline of arrangement | positioning of each part. It is explanatory drawing which shows the outline of a structure of the non-contact electric power feeding system in the 6th Embodiment of this invention, and the outline of arrangement | positioning of each part. It is explanatory drawing which shows the outline of a structure of the non-contact electric power feeding system in the 7th Embodiment of this invention, and the outline of arrangement | positioning of each part. It is explanatory drawing which shows the outline of a structure of the non-contact electric power feeding system in the 8th Embodiment of this invention, and the outline of arrangement | positioning of each part. It is explanatory drawing which shows the outline of a structure of the non-contact electric power feeding system in the 9th Embodiment of this invention, and the outline of arrangement | positioning of each part.

<First Embodiment>
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an outline of a configuration of a non-contact power feeding system according to a first embodiment of the present invention and an outline of the arrangement of each part on the side surface side of the tubular structure in which the non-contact power feeding system is installed ( It is explanatory drawing shown with the figure seen from the upper side of the structure. In FIG. 1, the non-contact power feeding system 1 includes a power transmitter 101 and a power receiver 102. 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 receiver 102 includes a power receiving secondary coil 106 and a power receiving primary coil 107.
The power transmitter 101 and the power receiver 102 are each arranged in a shape of winding an outer wall on the outer periphery of the tubular structure 112. In addition, the power receiver 108 is disposed inside the tubular structure 112.

  The power transmitter 101 is a device that supplies (transmits) power by generating a magnetic field (electromagnetic field) at a predetermined frequency (first frequency). The power receiver 102 is a device that resonates with the magnetic field of the first frequency generated by the power transmitter 101 and amplifies the magnetic field of the first frequency, and receives power by this resonance. The power receiver 102 is an example of a resonator according to the present invention in that it resonates with a magnetic field of the first frequency and amplifies the magnetic field of the first frequency.

In the power transmitter 101, the primary coil for power transmission 104 is connected to the power supply device 103 at each end thereof, and receives a supply of AC power of the first frequency from the power supply device 103 to generate a magnetic field of the first frequency. .
The secondary coil 105 for power transmission is a coil that forms a closed loop that is wound in multiples, and amplifies the magnetic field generated by the primary coil 104 for power transmission. Note that there is no electrical connection between the primary coil for power transmission 104 and the secondary coil for power transmission 105.

When power is transmitted from the power transmitter 101 to the power receiver 102, a magnetic field is formed in the space between the power transmitter 101 and the power receiver 102. FIG. 1 conceptually shows the generated magnetic field lines 110. The power transmitter 101 generates an alternating magnetic field (that is, the poles are switched). The magnetic field lines 110 are indicated by arrows from the power transmitter 101 side to the power receiver 102 side in accordance with the direction of power supply. The same applies to the following drawings.
The primary coil for power transmission, the secondary coil for power transmission, the primary coil for power reception, and the secondary coil for power reception all have the first frequency as the resonance frequency, and the power transmitter 101 and the power receiver 102 are A strong magnetic field is formed between the two by the magnetic field resonance method.

The primary coil for power reception 107 generates a voltage in resonance with the magnetic field generated by the power transmitter 101 at the first frequency. In this way, the power receiving primary coil 107 generates a voltage, whereby the power receiving device 102 receives power.
The power received by the power receiver 102 (that is, the power collected by the power receiving primary coil 107) is supplied via a feedback path 111 constituted by a conductive wire connected to the power supply device at each end of the power receiving primary coil 107. Returned to the device 103, the power transmitter 101 is used to generate a magnetic field at a first frequency.
The power receiving secondary coil 106 is a closed loop coil wound in multiples, and amplifies the magnetic field generated by the power transmitter 101 to increase the voltage generated by the power receiving primary coil 107. Note that there is no electrical connection between the power receiving secondary coil 106 and the power receiving primary coil 107.

  On the other hand, by placing the power receiver 108 in a magnetic field formed by the power transmitter 101 and the power receiver 102, the power receiver 108 can receive power using the power receiving coil 109 included in the power receiver 108 itself. The power receiving body 108 has a resonance frequency different from the first frequency, and can receive power by electromagnetic induction using a magnetic field of at least the first frequency amplified by the resonator 102. That is, the receiving coil 109 generates a voltage due to electromagnetic induction of a change in the magnetic field generated by the power transmitter 101 (particularly vibration at the first frequency) or a change in the magnetic field amplified by the power receiver 102. The power receiving body 108 receives power.

FIG. 2 is a graph showing an example of a three-dimensional simulation result of magnetic field formation in the space by the magnetic field resonance method. In the figure, the resonance frequency is 5 megahertz (= 1 wavelength 60 meters), and the coil diameters of the power transmitter (corresponding to the power transmitter 101 in FIG. 1) and the power receiver (corresponding to the power receiver 102 in FIG. 1) are set. The magnetic field strength distribution in the space between the power transmitter and the power receiver is shown when the distance between the coils is 3.3 meters and the distance between the coils is 3.3 meters.
As shown in the figure, in the case of the magnetic field resonance method, the magnetic field strength in the vicinity of the power transmitter and the power receiver is increased. This is because the resonance phenomenon is used, and the space transmission efficiency between the power receiving coils separated by 3.3 meters from the power transmitting coil was estimated to be 90%.
As described above, the transmission distance of the magnetic field resonance method is generally about 1/20 of the resonance wavelength. Therefore, in FIG. 2, it can be said that high-efficiency inter-coil transmission could be expanded to 3.3 meters by increasing the coil diameter to 3 meters.

  In this experimental configuration, when the distance between the power transmitter and the power receiver is closer than 3.3 meters, the transmission efficiency between the coils is greater than 90%. Further, when a power receiver (corresponding to the power receiver 108 in FIG. 1) is disposed between the power transmitter and the power receiver, a power receiving coil (corresponding to the power receiving coil 109 in FIG. 1) included in the power receiver at that position. The amount of power received is determined according to the lines of magnetic force that pass through. That is, the amount of power received by the power receiver depends on the specifications of the power receiving coil.

  As an example of the application of the non-contact power supply system 1, power supply to a water quality inspection sensor installed in a sewer pipe can be considered. More specifically, it is conceivable to optimize the sewage treatment process by measuring the degree of water pollution in the tubular structure 112 as a sewage pipe using the power receiver 108 as a water quality inspection sensor. At that time, using the non-contact power feeding system 1, the driving power of the water quality inspection sensor (power receiving body 108) can be easily made from outside the pipe (tubular structure 112) (for example, making a hole for passing the electric wire through the sewer pipe) Can be supplied without need). That is, each sensor can receive power from the magnetic field formed in the pipe using the power receiving coil 109 provided in the sensor (power receiving body 108) itself.

At this time, the amount of power received by each sensor is determined by the specification of the power receiving coil 109 provided in each sensor itself. Therefore, each sensor (power receiving body 108) is provided with a rectifier circuit and can receive a voltage that meets the specifications of the sensor itself. In addition, there may be a plurality of power receiving coils 109 included in each sensor, and the power obtained by each power receiving coil 109 can be combined to be received power. This sensor can always receive power anywhere and anytime in the pipe in which the magnetic field is formed. Therefore, power can be easily received even when the sensor is movable (moves in the pipe).
However, the use of the non-contact power feeding system 1 is not limited to power feeding to the water quality inspection sensor in the sewer pipe, and the non-contact power feeding system 1 can be used for non-contact power feeding in various situations.

As described above, the power transmitter 101 generates a magnetic field at the first frequency, and the power receiver 102 amplifies the magnetic field at the first frequency by resonating with the magnetic field at the first frequency. The power receiver 108 receives power by electromagnetic induction using a magnetic field having a first frequency amplified by the power receiver 102.
Accordingly, since the resonance frequency of the power receiving body 108 does not need to be the first frequency, there is no need to control the resonance frequency of the power receiving body 108, and the diameter of the power receiving coil 109 included in the power receiving body 108 is reduced. I can do it. There is no restriction on the design and operation of the power receiver 108 in that it is not necessary to control the resonance frequency of the power receiver 108. For example, the power receiver 108 can be disposed relatively easily in an environment where temperature fluctuations are intense, in water, or in places where control from the outside is relatively difficult, such as in a pipe.

  The power transmitter 101 and the power receiver 102 form a magnetic field inside the tubular structure 112, and the power receiver 108 can receive power anywhere in the magnetic field. Therefore, the power receiver 108 can receive power even when the distance from the power transmitter 101 is long.

  In addition, the electrical energy received by the power receiver 102 is returned to the power supply device 103 via the feedback loop 111. Thereby, less energy is required to form a magnetic field inside the tubular structure 112.

  Note that, as in the case of the second embodiment described below, the non-contact power feeding system 1 may include a plurality of power receiving bodies 108. In this case, the resonance frequencies of the respective power receivers may be the same or different from each other. This is because the power receiving body 108 receives power by electromagnetic induction and does not need to resonate with the frequency (first frequency) of the magnetic field generated by the power transmitter 101. In addition, it is not necessary to pay attention to the resonance frequency shift caused by arranging the plurality of power receiving bodies 108 close to each other, and the plurality of power receiving bodies 108 can be easily brought close to each other.

Further, as described above, one power receiving body 108 may include a plurality of power receiving coils 109. In this case, the resonance frequencies of the power receiving coils 109 may be the same or different from each other.

In addition, the environment where the non-contact electric power feeding system 1 is installed is not limited to the tubular structure described above, and can be installed in various environments that can realize the operation of the present invention. For example, the space where the power receiving body 108 is disposed does not have to be covered with a wall. Further, when the non-contact power feeding system 1 is installed in a tubular structure, the cross section of the tubular structure does not have to be circular, and may be rectangular or the like. Each coil included in the non-contact power feeding system 1 may have various shapes such as a linear conductor, a curved conductor, or a conductor composed of a straight line and a curved line. .
Moreover, each coil which the non-contact electric power feeding system 1 comprises may be comprised with the inductor and the capacity | capacitance.

<Second Embodiment>
FIG. 3 shows an outline of the configuration of the non-contact power feeding system and an outline of the arrangement of each part in the second embodiment of the present invention when viewed from the side of the tubular structure in which the non-contact power feeding system is installed. It is explanatory drawing shown in the figure. In the figure, the non-contact power feeding system 2 includes a power transmitter 101, a power receiver 102, and repeaters 113a and 113b. 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 receiver 102 includes a power receiving secondary coil 106 and a power receiving primary coil 107.
The power transmitter 101, the power receiver 102, and the repeaters 113 a and 113 b are respectively arranged on the outer periphery of the tubular structure 112 so as to wind an outer wall. In addition, the power receiver 108 is disposed inside the tubular structure 112.

  In the same figure, portions having the same functions corresponding to the respective portions in FIG. 1 are denoted by the same reference numerals (101 to 112), and description thereof is omitted. The non-contact power feeding system 2 shown in FIG. 3 includes two repeaters 113a and 113b between the power transmitter 101 and the power receiver 102, and two power receivers 108 inside the tubular structure 112. It differs from the non-contact electric power feeding system 1 shown in FIG.

The repeater 113 is disposed between the outer periphery of the tubular structure 112 and between the power transmitter 101 and the power receiver 102, and amplifies the magnetic field of the first frequency by resonating with the magnetic field of the first frequency. Specifically, the repeater 113a disposed on the power transmitter 101 side amplifies the magnetic field generated by the power transmitter 101. Then, the repeater 113b disposed on the power receiver 102 side amplifies the magnetic field amplified by the repeater 113a. The power receiver 102 amplifies the magnetic field amplified by the repeater 113b.
As described above, the repeaters 113a and 113b and the power receiver 102 are examples of the resonator according to the present invention, and the non-contact power feeding system 2 includes a plurality of resonators. Further, the repeater 113b that is a resonator further amplifies the magnetic field of the first frequency amplified by the repeater 113a that is another resonator, and the power receiver 102 that is the resonator is the repeater 113b that is another resonator. Further amplifies the magnetic field of the first frequency amplified.

  Here, as described above, the magnetic field between the power transmitter 101 and the power receiver 102 depends on the resonance wavelength (therefore, the frequency of the magnetic field generated by the power transmitter 101) and the coil diameter. In other words, the magnetic field between the power transmitter 101 and the power receiver 102 can be strengthened by the design of the frequency of the magnetic field to be generated (that is, the frequency of the electric power to be transmitted) and the coil diameter, and the power receiver 108 disposed therebetween. However, power can be received by the power receiving coil 109 of the power receiving body 108 itself.

  Further, in the non-contact power feeding system 2, by inserting repeaters 113a and 113b between the power transmitter 101 and the power receiver 102, the electromagnetic field strength at the positions of these repeaters 113a and 113b is increased and received from the power transmitter 101. The electric field inside the tubular structure 112 up to the electric device 102 can be kept strong.

  Here, for example, the intervals between the power transmitter 101, the repeaters 113a and 113b, and the power receiver 102 are all 2 meters. In addition, each coil diameter is 3 meters as in the condition of FIG. The primary coil for power transmission 104 and the primary coil for power reception 107 are circular single-layer windings, and the secondary coil for power transmission 105 and the secondary coil for power reception 106 are circular spiral and have 5.75 windings. The coils of the repeaters 113a and 113b are also circular spiral and have 5.75 turns. In addition, the resonance frequency in the magnetic field resonance method is 5 MHz, the distance between the primary coil for power transmission 104 and the secondary coil for power transmission 105, and the distance between the secondary coil for power reception 106 and the primary coil for power reception 107 are: Fix at the distance where resonance is strongest.

In this case, the distance between the power transmitter 101 and the repeater 113a on the power transmitter side is 2 meters, which is shorter than the distance between coils of 3.3 meters in the simulation described with reference to FIG. Therefore, the transmission efficiency between the power transmitter 101 and the repeater 113a is expected to be higher than the transmission efficiency of 90% shown in FIG. Furthermore, a high value (for example, about 90% or more) can be expected for the magnetic field strength at the intermediate position between the power transmitter 101 and the repeater 113a.
Further, since the distance between the repeater 113a on the power transmitter side and the repeater 113b on the power receiver side is also 2 meters, and the distance between the repeater 113b on the power receiver side and the power receiver 102 is also 2 meters, transmission of 90% or more is similarly performed. Efficiency can be expected. Therefore, over a distance of 6 meters between the power transmitter 101 and the power receiver 102, the transmission efficiency (90% × 90% × 90% =) can be expected to be about 73% or more, and the tubular structure 112 in this region can be expected. The internal magnetic field strength can be kept strong.

  In addition, the electrical energy received by the power receiver 102 is returned to the power supply device 103 via the feedback loop 111. Accordingly, as in the case of the non-contact power feeding system 1 (FIG. 1), less energy is required to form a magnetic field inside the tubular structure 112.

  Note that the number of power receiving bodies 108 included in the non-contact power feeding system 2 is not limited to two as illustrated in FIG. 3, and may be one or three or more. Further, when the non-contact power feeding system 2 includes a plurality of power receivers, as described in the non-contact power feeding system 1 (FIG. 1), the resonance frequencies of the respective power receivers may be the same or different from each other. May be. Further, when one power receiving body 108 includes a plurality of power receiving coils 109, the resonance frequencies of the power receiving coils 109 may be the same or different from each other.

As described above, according to the present invention, the function of magnetic field formation in the pipe performed by the power transmitter 101, the repeaters 113a and 113b and the power receiver 102, and the function of power reception performed by the power receiver 108, even in a wide area in the pipe. In addition, by separating the functions, it is possible to construct a system capable of supplying power over a wide range in the pipe.
For example, when the diameter of the power receiving coil 109 included in the sensor (power receiving body 108) is 5 centimeters (cm), a power reception amount of 20 milliwatts (mW) or more is expected in the simulation. Here, the applied power to the power transmitter 101 was 150 watts.
The non-contact power supply system 2 can be used for non-contact power supply in various scenes, such as water quality inspection in the sewer pipe, similarly to the non-contact power supply system 1.

  As described above, by arranging at least one repeater 113 between the power transmitter 101 and the power receiver 102, a space for forming an electric field can be expanded.

  In addition, the energy transmitted from the power transmitter 101 to form the magnetic field and received by the power receiver 102 through the repeater 113 is returned to the power transmitter 101, thereby suppressing the power energy for forming the magnetic field. I can do it.

<Third Embodiment>
FIG. 4 shows the outline of the configuration of the non-contact power feeding system and the outline of the arrangement of each part in the third embodiment of the present invention when viewed from the side of the tubular structure in which the non-contact power feeding system is installed. It is explanatory drawing shown in the figure. In the figure, the non-contact power feeding system 3 includes a power transmitter 101b, a power receiver 102, and repeaters 113a and 113b.
The power transmitter 101 b includes a power supply device 103, a power transmission primary coil 104, and a power transmission secondary coil 105. The power receiver 102 includes a power receiving secondary coil 106 and a power receiving primary coil 107.
The power transmitter 101, the power receiver 102, and the repeaters 113 a and 113 b are respectively arranged on the outer periphery of the tubular structure 112 so as to wind an outer wall. In addition, the power receiver 108 is disposed inside the tubular structure 112.

In the figure, portions having the same functions corresponding to the respective portions in FIG. 3 are denoted by the same reference numerals (101 to 112, 113a, 113b), and description thereof is omitted. In order to make the drawing easy to see, the power receiving coil 109 is not shown in FIG. 4, but the power receiving body 108 includes the power receiving coil 109 as in the case of FIG. 3. The non-contact power feeding system 3 shown in FIG. 4 is different from that shown in FIG. 3 in that a secondary coil for power transmission 103, repeaters 113a and 113b, and a power receiver 102 are arranged on the left and right sides of the primary coil for power transmission 104, respectively. Different from the contact power supply system 2.
Note that the number of power receiving bodies 108 included in the non-contact power supply system 3 may be one as in the case of the non-contact power supply system 2 (FIG. 3), or may be two or more.

  In the power transmitter 101b, one primary coil 104 for power transmission and one secondary coil 105 for power transmission have the same function corresponding to the power transmitter 101 in the non-contact power feeding system 2 (FIG. 3). Therefore, the secondary coil for power transmission 105 is disposed on both axial sides of the primary coil for power transmission 104 (left and right in FIG. 4), so that the power transmitter 101b can generate magnetic fields on both the left and right sides. .

  In this way, the power transmitter 101b transmits power to the power receivers 102 on both the left and right sides, so that the region for forming the magnetic field can be expanded. As described above, the frequency of the power to be transmitted and the design of the coil diameter can strengthen the magnetic field in the space between the power transmitter 101 and the power receiver 102 (increase the amplitude), and be arranged between them. The received power receiver 108 can receive power with the power receiving coil of the power receiver 108 itself.

  Specifically, the electric field (vibration) is propagated from the primary coil 104 for power transmission connected to the power supply apparatus 103 to the secondary coil 105 for power transmission arranged on the left and right sides, and repeaters 113a and 113b in both the left and right directions. In addition, power is supplied wirelessly to the power receiving primary coil 107 through the power receiving secondary coil 106. Here, by inserting the repeaters 113a and 113b, the magnetic field strength at the positions of the repeaters 113a and 113b can be increased, and the magnetic field inside the tubular structure 112 from the power transmitter 101 to the power receiver 102 can be kept strong. .

  Here, for example, as in the case of the non-contact power feeding system 2 (FIG. 3), the intervals between the power transmitter 101, the repeaters 113a and 113b, and the power receiver 102 are all 2 meters. In addition, each coil diameter is 3 meters as in the condition of FIG. The primary coil for power transmission 104 and the primary coil for power reception 107 are circular single-layer windings, and the secondary coil for power transmission 105 and the secondary coil for power reception 106 are circular spiral and have 5.75 windings. The coils of the repeaters 113a and 113b are also circular spiral and have 5.75 turns. In addition, the resonance frequency in the magnetic field resonance method is 5 MHz, the distance between the primary coil for power transmission 104 and the secondary coil for power transmission 105, and the distance between the secondary coil for power reception 106 and the primary coil for power reception 107 are: Fix at the distance where resonance is strongest.

In this case, the distance between the power transmitter 101 and the repeater 113a on the power transmitter side is 2 meters, and the transmission efficiency between the power transmitter 101 and the repeater 113a is shown in FIG. The transmission efficiency is expected to be higher than 90%. Furthermore, a high value (for example, about 90% or more) can be expected for the magnetic field strength at the intermediate position between the power transmitter 101 and the repeater 113a.
Also, transmission efficiency of 90% or more can be expected between the repeater 113a and the repeater 113b and between the repeater 113b and the power receiver 102 as in the case of the non-contact power feeding system 2. Therefore, the total power received by the right power receiver 102 and the left power receiver 102 in FIG. 4 over a distance of 6 meters for a total distance of 6 meters between the power transmitter 101 and the left and right power receivers 102, About 73% or more of the electric power generated by the power transmission device 101 by generating an electric field can be expected, and the magnetic field strength inside the tubular structure 112 in this region can be kept strong.

In addition, the electrical energy received by the power receiver 102 is returned to the power supply device 103 via the feedback loop 111. Thereby, as in the case of the non-contact power feeding systems 1 and 2, less energy is required to form a magnetic field inside the tubular structure 112.
The non-contact power supply system 3 can be used for non-contact power supply in various scenes, such as water quality inspection in a sewer pipe, similarly to the non-contact power supply system 1 and the non-contact power supply system 2.

<Fourth Embodiment>
FIG. 5 is an explanatory diagram showing the outline of the configuration of the non-contact power feeding system and the outline of the arrangement of each part in the fourth embodiment of the present invention. The figure (a) is the figure which looked at the outline of the composition of the non-contact electric power feeding system in this embodiment, and the outline of arrangement of each part from the side of the tubular structure in which the non-contact electric power feeding system is installed. Is shown.
In FIG. 2A, the non-contact power feeding system 4 includes a power transmitter 101c, a power receiver 102, and repeaters 113a and 113b.
The power transmitter 101 c includes a power supply device 103, a power transmission primary coil 104, and a power transmission secondary coil 105. The power receiver 102 includes a power receiving secondary coil 106 and a power receiving primary coil 107.
The power transmitter 101, the power receiver 102, and the repeaters 113 a and 113 b are respectively arranged on the outer periphery of the tubular structure 112 so as to wind an outer wall. In addition, the power receiver 108 is disposed inside the tubular structure 112.

In the figure, portions having the same functions corresponding to the respective portions in FIG. 4 are denoted by the same reference numerals (102 to 112, 113a, 113b), and description thereof is omitted. Note that, similarly to the case of FIG. 4, the power receiving body 108 includes a power receiving coil 109. The non-contact power feeding system 4 shown in FIG. 5 has a non-contact power feeding system 3 shown in FIG. 4 in that the power transmitter 101c includes one primary coil 104 for power transmission and one secondary coil 103 for power transmission. And different.
Note that the number of power receiving bodies 108 included in the non-contact power feeding system 4 may be one as in the case of the non-contact power feeding system 3 (FIG. 4), or may be two or more.

FIG. 5B shows a positional relationship between the primary coil for power transmission 104 and the secondary coil for power transmission 105 included in the non-contact power feeding system 4 in a cross-sectional view seen from the axial direction of these coils. . As shown in the figure, the diameter of the circular single-layer power transmission primary coil 104 is larger than the diameter of the circular spiral power transmission secondary coil 105, and the power transmission secondary coil 105 is surrounded by A primary coil for power transmission 104 is arranged at the approximate center of the width.
With this configuration, one power transmission secondary coil 105 can be reduced in comparison with the non-contact power feeding system 3.

<Fifth Embodiment>
FIG. 6 shows the outline of the configuration of the non-contact power feeding system and the outline of the arrangement of each part in the fifth embodiment of the present invention, in the annular structure in which the non-contact power feeding system is installed. It is explanatory drawing shown in the figure seen from the axial direction (the upper side of the said structure). In the figure, the non-contact power feeding system 5 includes a power transmitter 101 and a repeater 113. 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 transmitter 101 and the repeater 113 are each arranged in a shape that wraps around the outer wall of the annular structure 112b. The annular structure 112b is an example of a tubular structure having an annular structure, and the power receiving body 108 is disposed inside the annular structure 112b.

In the figure, parts having the same functions corresponding to the respective parts in FIG. 3 are denoted by the same reference numerals (101, 103 to 105, 108 to 110), and description thereof is omitted. Note that, similarly to the case of FIG. 4, the power receiving body 108 includes a power receiving coil 109. Further, the repeater 113 in FIG. 6 has the same function as the repeaters 113a and 113b in FIG.
The non-contact power feeding system 5 illustrated in FIG. 6 does not include the point installed on the circular tubular structure 112 b and the power receiver 102, and the magnetic field (lines of magnetic force) generated by the power transmitter 101 It differs from the non-contact electric power feeding system 3 shown in FIG.
Note that the number of power receiving bodies 108 included in the non-contact power feeding system 5 may be one as in the case of the non-contact power feeding system 3 (FIG. 4), or may be two or more.

  Here, the magnetic field generated between the power transmitter 101 and the power receiver 102 can be strengthened by the design of the frequency of the magnetic field generated by the power transmitter 101 and the coil diameter, and the power receiver 108 disposed therebetween is the power receiver. The power can be received by the power receiving coil 109 included in 108 itself.

  In addition, energy is transmitted from the primary coil for power transmission 104 connected to the power supply device 103 to the secondary coil for power transmission 105 by a magnetic field, and wirelessly fed from there through the repeater 113 in the clockwise and counterclockwise directions. . That is, when the power transmitter 101 generates a magnetic field, a magnetic field having a polarity opposite to the magnetic field generated clockwise (when viewed from the power transmitter 101 toward the left as viewed in FIG. 6) is counterclockwise (toward FIG. 6). Seeing from the power transmitter 101 to the right).

The repeater 113 is arranged so that the clockwise magnetic field and the counterclockwise magnetic field generated by the power transmitter 101 return to the power transmitter 101 after making a round. The magnetic field that has returned to the power transmitter 101 is transmitted around again together with the magnetic field generated by the power transmitter 101 with the power supplied from the power supply device 103.
Further, by inserting the repeater 113, the magnetic field strength at the position of each repeater 113 can be increased, and the magnetic field inside the annular structure 112b can be kept strong.

  Here, for example, the distance between the power transmitter 101 and the repeater 113 and the distance between the repeaters 113 are all 3.1 meters at the center of these coils. In addition, each coil diameter is 3 meters as in the condition of FIG. The primary coil 104 for power transmission is a circular single layer winding, and the secondary coil 105 for power transmission is a circular spiral type with 5.75 windings. The coil of the repeater 113 is also a circular spiral type with 5.75 turns. The resonance frequency in the magnetic field resonance method is 5 MHz, and the interval between the primary coil for power transmission 104 and the secondary coil for power transmission 105 is fixed at a distance at which resonance is strongest.

  In this case, the distance between the coil centers of the power transmitter 101 and the repeater 113 and the distance between the coil centers between the repeaters are 3.1 meters, and the distance between the coils in the simulation described with reference to FIG. 2 is 3.3. Almost the same as a meter. Therefore, a strong electric field can be formed particularly in the vicinity of each coil of the power transmitter 101 and the repeater 112. Here, the position of each repeater 113 is such that the sum of the electromagnetic energy propagated clockwise and counterclockwise from the power transmitter 101 propagates counterclockwise with the electromagnetic energy propagated clockwise at the position of the repeater 113. It is arranged at a place where the ratio of the electromagnetic energy propagating to the sum of absolute values is 0.5 or more. Thereby, the electromagnetic waves transmitted clockwise and counterclockwise are designed not to cancel each other at the position of the repeater 113 or the power transmitter 101 (at the time of rotation) due to the phase difference.

  Further, the magnetic field (electromagnetic energy) sent from the power transmitter 101 returns to the power transmitter 101 via the repeater 113. Thereby, less energy is required to form a magnetic field inside the annular structure 112b.

  As an example of the application of the non-contact power supply system 5, power supply to an authentication tag in an annular structure can be considered. More specifically, the power receiver 108 is an authentication tag attached to the package, and wirelessly transmits its position information and package identification information (identification information of the authentication tag) in response to an inquiry or periodically. Send. The annular structure 112b is a rotary luggage shelf used as a place for the luggage. Power can be easily supplied to the authentication tag in the luggage shelf using the non-contact power supply system 5 (without the need to connect a power supply cable to the authentication tag). That is, each authentication tag can receive power from a magnetic field formed inside the luggage rack using a coil included in the authentication tag (power receiving body 108) itself.

  At that time, the amount of power received by each authentication tag is determined by the specification of the power receiving coil included in each authentication tag. Accordingly, each authentication tag (power receiving body 108) is provided with a rectifier circuit and can receive a voltage that meets the specifications of the authentication tag itself. In addition, there may be a plurality of power receiving coils included in each authentication tag, and the power obtained by each power receiving coil can be combined to obtain the received power. This authentication tag can always receive power anywhere and anytime in the luggage rack where the magnetic field is formed. Therefore, the authentication tag can easily receive power regardless of where the authentication tag is located on the luggage rack or when the luggage rack rotates and the authentication tag moves.

As described above, according to the present invention, in the entire annular structure, the function is separated into the function of magnetic field formation in the structure performed by the power transmitter 101 and the repeater 113 and the function of power reception performed by the power receiver 108. Thus, a system capable of supplying power anywhere in the structure can be constructed.
For example, when the diameter of the power receiving coil included in the authentication tag (power receiving body 108) is 5 centimeters, a power reception amount of 10 milliwatts or more is expected in the simulation. Here, the applied power to the power transmitter 101 was 100 watts.
However, the use of the non-contact power supply system 5 is not limited to the power supply to the authentication tag, and the non-contact power supply system 5 can be used for non-contact power supply in various scenes.

  As described above, the energy transmitted from the power transmitter 101 to form a magnetic field can be returned to the power transmitter 101 via the plurality of repeaters 113. Thereby, the electric power energy for forming a magnetic field can be suppressed. Here, the cross section of the annular structure may be circular or rectangular as long as the structure meets the gist of the present invention.

  Also, the repeater 113 and the power transmitter 101 are arranged at a position where the ratio of the sum of the electromagnetic energy propagated clockwise and counterclockwise from the power transmitter 101 to the sum of the absolute values of the individual energy is 0.5 or more. By doing so, it is possible to prevent the electromagnetic energy from canceling each other out at the position of the repeater 113 or the power transmitter 101 (at the time of lap).

<Sixth Embodiment>
FIG. 7 shows the outline of the configuration of the non-contact power feeding system and the outline of the arrangement of each part in the sixth embodiment of the present invention in the partial annular structure in which the non-contact power feeding system is installed. It is explanatory drawing shown in the figure seen from the axial direction (the upper side of the said structure) of a ring. In the figure, the non-contact power feeding system 5 includes a power transmitter 101 and a repeater 113. 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 transmitter 101 and the repeater 113 are each arranged in a shape that wraps around the outer wall of the partial annular structure 112c. The partial annular structure 112c is an example of a tubular structure having an annular structure, and the power receiver 108 is disposed inside the partial annular structure 112c.

In the figure, portions having the same functions corresponding to the respective portions in FIG. 6 are denoted by the same reference numerals (101, 103 to 105, 108 to 110, 113), and description thereof is omitted. Note that, similarly to the case of FIG. 6, the power receiving body 108 includes a power receiving coil 109.
The non-contact power feeding system 6 shown in FIG. 7 is different from the non-contact power feeding system 5 shown in FIG. 6 in that the non-contact power feeding system 6 is installed in a partial annular structure 112c.
Note that the number of power receiving bodies 108 included in the non-contact power feeding system 6 may be one as in the case of the non-contact power feeding system 5, or may be two or more.

As shown in the figure, even if the ring of the structure is interrupted, there is no problem in the effect of the present invention as long as a magnetic field can be formed in each structure.
Similarly to the case of the non-contact power feeding system 5 (FIG. 6), the magnetic field between the power transmitter 101 and the power receiver 102 can be strengthened by designing the frequency of the magnetic field generated by the power transmitter 101 and the coil diameter. In addition, the power receiving body 108 disposed therebetween can receive power by the power receiving coil 109 provided in the power receiving body 108 itself.

Similarly to the case of the non-contact power supply system 5, energy is transmitted from the primary coil for power transmission 104 connected to the power supply device 103 to the secondary coil for power transmission 105 by a magnetic field, and from there clockwise and counterclockwise The wireless power is supplied through the repeater 113. The repeater 113 is arranged so that the clockwise magnetic field and the counterclockwise magnetic field generated by the power transmitter 101 return to the power transmitter 101 after making a round. The magnetic field that has returned to the power transmitter 101 is transmitted around again together with the magnetic field generated by the power transmitter 101 with the power supplied from the power supply device 103.
Further, by inserting the repeater 113, the magnetic field strength at the position of each repeater 113 can be increased, and the magnetic field inside the annular structure 112b can be kept strong.

  Here, for example, the distance between the power transmitter 101 and the repeater 113 and the distance between the repeaters 113 are all 30 centimeters at the center of these coils. Moreover, each coil diameter shall be 30 centimeters in diameter. The primary coil 104 for power transmission is a circular single layer winding, and the secondary coil 105 for power transmission is a circular spiral type with 5.75 windings. The coil of the repeater 113 is also a circular spiral type with 5.75 turns. The resonance frequency in the magnetic field resonance method is 5 MHz, and the interval between the primary coil for power transmission 104 and the secondary coil for power transmission 105 is fixed at a distance at which resonance is strongest.

  In addition, as described with reference to FIG. 6, the position of each repeater 113 is such that the total value of electromagnetic energy propagated clockwise and counterclockwise from the power transmitter 101 is clockwise at the position of the repeater 113. The electromagnetic energy propagating and the electromagnetic energy propagating counterclockwise are arranged at a place where the ratio to the sum of absolute values is 0.5 or more. Thereby, the electromagnetic waves transmitted clockwise and counterclockwise are designed not to cancel each other at the position of the repeater 113 or the power transmitter 101 (at the time of rotation) due to the phase difference.

  Further, the magnetic field (electromagnetic energy) sent from the power transmitter 101 returns to the power transmitter 101 via the repeater 113. Thereby, less energy is required to form a magnetic field inside the annular structure 112b.

  As an example of the application of the contactless power supply system 6, power supply to an active authentication tag in a partial annular structure can be considered. More specifically, the power receiver 108 is an active authentication tag, and the partial annular structure 112c is a batch charger that batch-charges a large number of active authentication tags. A large number of active authentication tags can be placed in the batch charger, and power can be received from a magnetic field formed by a magnetic resonance method using a power receiving coil included in the active authentication tag (power receiving body 108) itself. At this time,

  At that time, the amount of power received by each active authentication tag is determined by the specification of the power receiving coil included in each active authentication tag. Therefore, each active authentication tag (power receiving body 108) includes a rectifier circuit and can receive a voltage that meets the specifications of the active authentication tag itself. Moreover, there may be a plurality of power receiving coils included in each active authentication tag, and the power obtained by each power receiving coil can be combined to obtain the received power.

As described above, according to the present invention, active authentication tags having various specifications can be collectively charged in a partial annular charger.
For example, when the diameter of the power receiving coil included in the authentication tag (power receiving body 108) is 0.5 centimeter, a power reception amount of 25 milliwatts or more is expected in the simulation. Here, the applied power to the power transmitter was 100 watts.
In this manner, a large number of power receiving bodies 108 arranged inside the tubular structure can be charged at a time by the magnetic field formed inside the tubular structure. For example, it is possible to supply power to a large number of power receiving bodies 108 in an unattended management environment.

  However, the use of the non-contact power feeding system 6 is not limited to collective charging of the active authentication tag, and the non-contact power feeding system 6 can be used for non-contact power feeding in various situations.

  As described above, the present invention can be applied even when the annular structure is fragmented, and the same effects as those obtained when the annular structure is continuously formed can be obtained.

  Next, with reference to FIGS. 8 to 10, three structural examples are disclosed regarding the wireless power feeding into the annular structure shown in the fourth and fifth examples.

<Seventh Embodiment>
FIG. 8 is an explanatory diagram showing the outline of the configuration of the non-contact power feeding system and the outline of the arrangement of each part in the seventh embodiment of the present invention. The figure (a) looked at the outline of the composition of the non-contact electric supply system in this embodiment, and the outline of arrangement of each part from the side of the annular structure where the non-contact electric supply system is installed. It is shown in the figure.
In FIG. 2A, the non-contact power feeding system 7 includes a power transmitter 101 c and a repeater 113. The power transmitter 101 c includes a power supply device 103, a power transmission primary coil 104, and a power transmission secondary coil 105.
The power transmitter 101c and the repeater 113 are each arranged in a shape that wraps around the outer wall of the annular structure 112b. The annular structure 112b is an example of a tubular structure having an annular structure, and the power receiving body 108 is disposed inside the annular structure 112b.

In the figure, portions having the same functions corresponding to the respective portions in FIG. 6 are denoted by the same reference numerals (103 to 105, 108 to 110, 113), and description thereof is omitted. Note that, similarly to the case of FIG. 6, the power receiving body 108 includes a power receiving coil 109. 8 is different from the non-contact power feeding system 5 shown in FIG. 6 in the positional relationship between the primary coil for power transmission 104 and the secondary coil 105 for power transmission.
Note that the number of power receiving bodies 108 included in the non-contact power feeding system 7 may be one as in the case of the non-contact power feeding system 5 (FIG. 6), or may be two or more.

  FIG. 8B shows a positional relationship between the primary coil for power transmission 104 and the secondary coil for power transmission 105 included in the non-contact power feeding system 7 in a cross-sectional view seen from the axial direction of these coils. . As shown in the figure, the diameter of the circular single-layer power transmission primary coil 104 is larger than the diameter of the circular spiral power transmission secondary coil 105, and the power transmission secondary coil 105 is surrounded by A primary coil for power transmission 104 is arranged at the approximate center of the width.

  By taking the configuration of FIG. 8 above, the symmetry of electromagnetic energy transmission from the primary coil 104 to the secondary coil 105 inside the power transmitter is maintained with respect to the propagation of clockwise and counterclockwise electromagnetic energy, And it can arrange | position in the position where the said primary coil does not become obstruction | occlusion with respect to the circulating electrical energy. Thereby, the transmission loss of the circulating electromagnetic energy can be suppressed.

<Eighth Embodiment>
FIG. 9 is an explanatory diagram showing the outline of the configuration of the non-contact power feeding system and the outline of the arrangement of each part in the eighth embodiment of the present invention. The figure (a) looked at the outline of the composition of the non-contact electric supply system in this embodiment, and the outline of arrangement of each part from the side of the annular structure where the non-contact electric supply system is installed. It is shown in the figure.
In FIG. 2A, the non-contact power feeding system 8 includes a power transmitter 101c and a repeater 113b. The power transmitter 101 c includes a power supply device 103, a power transmission primary coil 104, and a power transmission secondary coil 105. The repeater 113b includes a primary coil 114 and a secondary coil 115.
The power transmitter 101c and the repeater 113b are respectively arranged in a shape that wraps around the outer wall of the annular structure 112b. The annular structure 112b is an example of a tubular structure having an annular structure, and the power receiving body 108 is disposed inside the annular structure 112b.

In the same figure, portions having the same functions corresponding to the respective portions in FIG. 8 are denoted by the same reference numerals (101c, 103 to 105, 108 to 110, 112b), and description thereof is omitted. Note that, similarly to the case of FIG. 8, the power receiving body 108 includes a power receiving coil 109.
Note that the number of power receiving bodies 108 included in the non-contact power feeding system 8 may be one as in the case of the non-contact power feeding system 7 (FIG. 8), or may be two or more.

  FIG. 9B shows a schematic configuration of the primary coil 114 in a cross-sectional view seen from the axial direction of the primary coil. As shown in the figure, the primary coil 114 includes a switch 116. In the closed (ON) state of the switch 116, the primary coil 114 conducts electricity. On the other hand, when the switch 116 is in the open (OFF) state, the primary coil 114 does not conduct electricity (that is, the primary coil 114 is insulated between both ends).

  When the switch 116 is in the open state, the primary coil 114 including the switch 116 does not affect the transmission of electromagnetic energy. In this case, the secondary coil 115 alone paired with the primary coil functions similarly to the repeater 113 in the non-contact power feeding system 7.

  On the other hand, when the switch 116 is in the closed state, the feedback coil 111 is formed by connecting both ends of the primary coil 114 including the switch 116 and the power supply device 103 in advance, thereby forming the feedback coil 111. The repeater 113b including 114 can function in the same manner as the power receiver 102 (for example, FIG. 1). That is, the power collected by the primary coil 114 can be returned to the power supply device 103 via the feedback path 111 and used by the power transmitter 101c to generate a magnetic field at the first frequency.

  In order to make the drawing easy to see, FIG. 9 shows a state in which only one of the repeaters 113b is connected to the power supply device 111 to form the feedback path 111, but other repeaters 113b (for example, all repeaters 113b) The return path 111 may be formed by connecting the repeater 113b) to the power supply device 111. Accordingly, by selecting the switch 116 to be closed, the position of the repeater 113b that functions as the power receiver 102 can be selected, and the distribution of the strength of the magnetic field can be adjusted. Further, by returning the electricity received by the repeater 113b as a power receiver to the power supply device 103, less energy is required to form a magnetic field inside the annular structure 112b.

  The application range of the repeater including the switch described in this embodiment is not limited to the non-contact power supply system installed in the annular structure illustrated in FIG. 9, and can be applied to various non-contact power supply systems. . For example, a primary coil with a switch may be provided in the repeater 113 shown in FIG. 3 so that the function as a repeater and the function as a power receiver can be selected. Thereby, the distribution of the strength of the magnetic field can be adjusted, and more power can be returned to the power supply device by appropriately selecting the distance from the power transmitter to the power receiver (as a repeater). .

<Ninth Embodiment>
FIG. 10 shows the outline of the configuration of the non-contact power feeding system and the outline of the arrangement of each part in the ninth embodiment of the present invention from the side of the annular structure where the non-contact power feeding system is installed. It is explanatory drawing shown with the figure seen. In the figure, the non-contact power feeding system 9 includes a power transmitter 101d and a repeater 113b. The power transmitter 101d includes a power supply device 103, a primary coil 114, and a power transmission secondary coil 105. The repeater 113b includes a primary coil 114 and a secondary coil 115.
The power transmitter 101d and the repeater 113b are arranged in a shape that wraps around the outer wall of the annular structure 112b. The annular structure 112b is an example of a tubular structure having an annular structure, and the power receiving body 108 is disposed inside the annular structure 112b.

In the same figure, portions having the same functions corresponding to the respective portions in FIG. 9 are denoted by the same reference numerals (103, 105, 108 to 110, 112b, 113b, 114 to 115), and description thereof is omitted. Note that, similarly to the case of FIG. 8, the power receiving body 108 includes a power receiving coil 109.
Note that the number of power receiving bodies 108 included in the non-contact power supply system 9 may be one as in the case of the non-contact power supply system 8 (FIG. 9), or may be two or more.
The non-contact power supply system 9 is different from the non-contact power supply system 8 in that the power transmitter 101d includes a primary coil 114.

  As described above, when the power transmitter 101d includes the primary coil 114 and the switch of the primary coil 114 (the switch 116 described with reference to FIG. 9) is in the open state, the transmission is performed in the same manner as described for the repeater 113b. The electrical device 101d functions in the same manner as the repeater 113 in the non-contact power feeding system 7. On the other hand, when the switch of the power transmitter 101d is in the closed state, the power transmitter 101d functions in the same manner as the power transmitter 101c.

Therefore, by selecting a switch that closes the switch among the plurality of power transmitters 101d, the position where the magnetic field is generated can be selected, and the distribution of the strength of the magnetic field can be adjusted. Alternatively, the magnetic field can be enhanced by generating a magnetic field in the plurality of power transmitters 101d.
As described with reference to FIG. 9, the repeater 113b can be connected to the power supply apparatus 103 in advance and can function as a power receiver or a repeater by opening and closing a switch included in the repeater 113b.

  Note that the applicable range of the power transmitter including the switch described in the present embodiment is not limited to the non-contact power supply system installed in the annular structure shown in FIG. 10, and can be applied to various non-contact power supply systems. is there. For example, a primary coil with a switch may be provided in the repeater 113 shown in FIG. 3 so that a function as a repeater and a function as a power transmitter can be selected. Thereby, the distribution of the strength of the magnetic field can be adjusted, or the magnetic field can be enhanced by generating a magnetic field in a plurality of power transmitters.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

101, 101b, 101c, 101d Power transmitter 102 Power receiver 103 Power supply device 104 Primary coil for power transmission 105 Secondary coil for power transmission 106 Primary coil for power reception 107 Secondary coil for power reception 108 Power receiver 109 Power reception coil 112 Tubular structure 112b annular structure 113, 113b repeater 114 primary coil 115 secondary coil 116 switch

Claims (10)

A power transmitter that transmits power by generating a magnetic field at a first frequency;
A resonator that resonates with the magnetic field of the first frequency and amplifies the magnetic field of the first frequency;
A power receiver capable of receiving power by electromagnetic induction by a magnetic field of the first frequency amplified by the resonator, the resonance frequency being different from the first frequency;
A non-contact power feeding system comprising: At least one of the resonators is a power receiver that receives power by resonating with the magnetic field of the first frequency;
The contactless power feeding system according to claim 1, wherein the power received by the power receiver is used by the power transmitter to generate a magnetic field at the first frequency. Comprising a plurality of the resonators;
The contactless power supply system according to claim 1, wherein at least one of the resonators further amplifies the magnetic field of the first frequency amplified by another resonator. The power transmitter includes a primary coil and a secondary coil, and the primary coil has a diameter larger than the diameter of the secondary coil, and the primary coil surrounds the secondary coil. Placed in
The contactless power feeding system according to any one of claims 1 to 3, wherein the resonator is installed on both sides of the power transmitter. The power transmitter and the amplifier are arranged in a shape that winds the outer wall of a tubular structure,
The non-contact power feeding system according to any one of claims 1 to 4, wherein the power receiving body is disposed inside the tubular structure. The tubular structure has an annular structure;
The power transmitter and the resonator constitute a path through which a magnetic field of the first frequency generated by the power transmitter returns to the power transmitter via a plurality of the resonators. Item 6. The non-contact power feeding system according to Item 5.   The resonator is arranged at a position where the ratio of the sum of the electromagnetic energy propagated clockwise and counterclockwise from the power transmitter to the sum of the absolute values of the individual energy is 0.5 or more. The non-contact electric power feeding system according to claim 6 characterized by things.   At least one of the resonators includes a primary coil, a secondary coil, and a switch connected to the primary coil, and is connected to the power transmitter or the power transmitter when the switch is connected. The contactless power feeding system according to any one of claims 1 to 7, wherein the system is a non-contact power feeding system.   The contactless power feeding system according to claim 1, further comprising a plurality of the power receivers. A power supply method for a non-contact power supply system,
A power transmission step in which the power transmitter transmits power by generating a magnetic field at a first frequency; and
A resonance step in which a resonator resonates with the magnetic field of the first frequency and amplifies the magnetic field of the first frequency;
A power receiving step in which a power receiver having a resonance frequency different from the first frequency receives power by electromagnetic induction using a magnetic field of the first frequency amplified by the resonator;
A power feeding method comprising:

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