JP2015035935A - Power supply system, power supply method and architecture member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable power supply from master equipment to slave equipment while weakening a magnetic field in a region in which the slave equipment can be disposed.SOLUTION: A power supply system includes: master equipment for generating a ferromagnetic region, in which magnetic fields generated by a first current and a second current are mutually strengthened, and a weakly magnetic region in which the magnetic fields are mutually weakened; and slave equipment disposed in the weakly magnetic region for generating a magnetic field reaching the ferromagnetic region. The magnetic field generated in the ferromagnetic region by the master equipment and the magnetic field generated in the weakly magnetic region by the slave equipment have mutually parallel components whose phases are different by 90 degrees, so that power is supplied from the master equipment to the slave equipment.

Description

  The present invention relates to a power feeding system, a power feeding method, and a building member.

  Non-contact power supply systems using magnetic field resonance are known. For example, a technique for transmitting electric power to a child device by laying a coil resonance element on a floor and providing a power transmission path of the coil resonance element to the position of the child device is disclosed (see Patent Document 1).

  By the way, when the wireless power feeding technology is used in a place where the human body or the like is active, the magnetic field is limited more than the place where the human body is touched from the viewpoint of protecting the human body. For example, the limit value of this limit is within about 21 A / m (the number of amperes) at 100 kHz. Since the energy that can be transmitted below this limit value is small, the transmission of energy exceeding 50 W is difficult due to the limitation. In other words, it is very difficult to prepare a large number of coils on one floor and transmit high power energy from there to the living space.

However, when operating home appliances on the floor or tabletop, in many cases, the home appliance is in contact with the floor or tabletop, and a human body or the like enters a very small amount between them. Note that examples of the human body entering between the home appliance and the floor include a hair dryer and a mobile phone.
On the other hand, when the base unit is placed on the entire floor, even if a human body can enter between the home appliance (slave unit) and the floor, a guard area is provided by placing an object in a strong magnetic field area There is. Patent Document 1 includes a transmission antenna 12 that receives an AC signal output from a signal generation unit to generate an electromagnetic field, and a reception antenna 21 that generates an induced voltage by an electromagnetic field at a position away from the transmission antenna 12. It is configured to be able to transmit power in a non-contact manner, is disposed between the transmission antenna 12 and the reception antenna 21 and is configured to be extendable and contractable according to the length between the transmission antenna 12 and the reception antenna 21. It is described that a partition 4 is provided that partitions the space from the antenna 12 to the reception antenna 21 from other spaces.

JP 2012-29418 A

  However, the invention described in Patent Document 1 is based on the premise that the antennas of the parent device and the child device are facing each other, and the magnetic field leaking to the side surface of the object intrusion area called a partition is not considered much.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a power feeding system, a power feeding method, and a building member that can feed power from a master unit to a slave unit while weakening a magnetic field in a region where the slave unit can be arranged. It is to provide.

  (1) In order to solve the above problem, a power feeding system according to one aspect of the present invention generates a strong magnetic field in which magnetic fields are strengthened inside an object, and a weak magnetic field in which magnetic fields are weakened outside the object. A parent device that generates a region; and a child device that is disposed in the weak magnetic region and generates a magnetic field that reaches the strong magnetic region; and a magnetic field generated by the parent device in the strong magnetic region; The magnetic field generated by the machine has components parallel to each other and components having phases different from each other by 90 degrees, so that power is supplied from the parent machine to the child machine.

  (2) In one embodiment of the present invention, in the power feeding system, the parent device includes a parent device antenna unit including a coil disposed on one side of the surface of the object, and an inner side of the coil of the parent device antenna unit. A master unit magnetic field control unit for generating the ferromagnetic region, wherein the slave unit is a slave unit antenna unit comprising a coil disposed on the other side of the surface of the object, and the coil of the slave unit antenna unit And a handset magnetic field control unit that generates a magnetic field that reaches the ferromagnetic region beyond the surface.

  (3) In one embodiment of the present invention, in the power feeding system, the base unit antenna unit includes the coils facing each other at an interval smaller than the width of the coil, and the base unit magnetic field control unit is a coil of the first layer. The magnetic field generated by the second layer coil and the magnetic field generated by the coil of the second layer are generated so that the components in the opposite direction are opposite to each other, thereby generating the first layer and the second layer. The strong magnetic region is generated on the inner side, and the weak magnetic region is generated on the outer side of the first layer and the second layer.

  (4) In one embodiment of the present invention, in the power feeding system, the base antenna unit includes a first layer and a second layer that are spaced apart in a direction perpendicular to the surface of the object. The base unit magnetic field control unit generates a magnetic field generated by the first layer coil and a magnetic field generated by the second layer coil so that components in the vertical direction are opposite to each other. Thus, the strong magnetic region is generated on the inner side between the first layer and the second layer, and the weak magnetic region is generated on the outer side of the first layer and the second layer, The magnetic field generated by the main unit antenna unit and the magnetic field generated by the sub unit antenna unit have components having the same frequency, components parallel to each other, and components having phases different from each other by 90 degrees. Have.

  (5) In one embodiment of the present invention, in the power feeding system, the base unit antenna unit of the base unit is formed by arranging a plurality of coils in parallel to the surface of the object, Due to the hopping phenomenon of the magnetic field, electric power energy is transmitted from a small number of power sources to the coil in the vicinity of the handset antenna portion of the handset compared to the plurality of coils.

  (6) According to one aspect of the present invention, in the power feeding system, a guard region, which is a region for blocking intruders, is provided on the other side of the surface of the object with the handset antenna unit of the handset. It was.

  (7) In order to solve the above problem, in the power feeding method according to one aspect of the present invention, the parent device generates a strong magnetic field in which magnetic fields are strengthened inside the object, and the magnetic fields are weakened outside the object. A magnetic field generated by the parent device is generated in the strong magnetic region, and a magnetic field generated by the parent device is generated in the strong magnetic region. Since the magnetic field to be generated has components parallel to each other and components having phases different from each other by 90 degrees, power is supplied from the parent device to the child device.

  (8) In order to solve the above problem, a building member according to one aspect of the present invention includes a first layer and a second layer that are spaced apart in a direction perpendicular to a floor or a wall, The magnetic field generated by the coil of the first layer and the magnetic field generated by the coil of the second layer are configured such that the components in the vertical direction are opposite to each other.

  According to the present invention, power can be supplied from the parent device to the child device while weakening the magnetic field in the region where the child device can be arranged.

It is a schematic block diagram which shows the structure of the electric power feeding system which concerns on one Embodiment of this invention. It is the schematic which shows the specific example of the electric power feeding system which concerns on one Embodiment of this invention. It is a figure which shows the structure of the antenna part of the main | base station installed in the inside of the floor which concerns on one Embodiment of this invention. It is a figure which shows the structure of the antenna part of the subunit | mobile_unit provided in the leg of the table which concerns on one Embodiment of this invention. It is a figure which shows the arrangement | positioning relationship between the magnetic field of the main | base station which concerns on 1st Embodiment of this invention, and the magnetic field of a subunit | mobile_unit. It is a figure which shows the specific example of arrangement | positioning relationship between the magnetic field of the main | base station which concerns on 1st Embodiment of this invention, and the magnetic field of a subunit | mobile_unit. It is a figure which shows the arrangement | positioning relationship between the magnetic field of a main | base station in the case of providing the guard area | region which concerns on 2nd Embodiment of this invention, and the magnetic field of a subunit | mobile_unit. It is a figure which shows the specific example of the arrangement | positioning relationship between the magnetic field of a main | base station in the case of providing the guard area | region which concerns on 2nd Embodiment of this invention, and the magnetic field of a subunit | mobile_unit. It is a figure which shows the structure of the antenna part of the main | base station installed in the inside of the floor which concerns on 3rd Embodiment of this invention. It is a front view of the antenna part which concerns on 3rd Embodiment of this invention. It is sectional drawing of the single coil which concerns on 3rd Embodiment of this invention. It is a top view of the antenna part which concerns on the modification of 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram illustrating a configuration of a power feeding system according to an embodiment of the present invention.
The power supply system includes a parent device 1 and a child device 2. The base unit 1 is a power transmission device that supplies power. The subunit | mobile_unit 2 is a power receiving apparatus which receives electric power.

The base unit 1 includes an antenna unit 11 configured using coils and a power feeding unit 12. The power feeding unit 12 includes a magnetic field control unit 21. Here, the antenna unit 11 generates a strong magnetic field in a partial region (ferromagnetic region) such as a region surrounded by a coil. On the other hand, the antenna unit 11 generates a weak magnetic field in other regions (weak magnetic regions). Specifically, in the strong magnetic field, each magnetic field generated by current flowing through each part of the coil interferes and strengthens each magnetic field. On the other hand, in the weak magnetic field, each magnetic field generated by the current flowing through each part of the coil interferes and weakens each magnetic field. The antenna unit 11 is installed inside an object such as a floor, a wall, or a desk, for example. The antenna unit 11 generates a magnetic field so that the inside of the object is a strong magnetic region and the outside of the object is a weak magnetic region.
The subunit | mobile_unit 2 is provided with the antenna part 51 comprised using a coil, and the power receiving part 52. FIG. The power receiving unit 52 includes a magnetic field control unit 61 and a power output unit 62. The subunit | mobile_unit 2 is arrange | positioned outside objects, such as a floor, a wall, a desk, for example. That is, a region where a person exists and the slave unit 2 can be arranged is a weak magnetic region.

In the power feeding system, electric power is transmitted from the parent device 1 to the child device 2 via the antenna unit 11 and the antenna unit 51, thereby supplying power from the parent device 1 to the child device 2.
Specifically, in base unit 1, magnetic field control unit 21 of power feeding unit 12 generates a magnetic field from antenna unit 11. On the other hand, in the handset 2, the magnetic field control unit 61 of the power reception unit 52 generates a magnetic field from the antenna unit 51. At this time, the magnetic field generated from the coil constituting the antenna unit 51 of the slave unit 2 has the same frequency component as the magnetic field in the strong magnetic field generated from the coil constituting the antenna unit 11 of the master unit. The power is transmitted from the antenna unit 11 of the parent device 1 to the antenna unit 51 of the child device 2 by having parallel components and components having a phase difference of 90 degrees. And in the subunit | mobile_unit 2, the electric power output part 62 of the power receiving part 52 outputs and supplies the electric power received from the main | base station 1 to the exterior.
Thereby, in the power feeding system, power can be supplied from the parent device 1 to the child device 2 while suppressing a magnetic field in a region where the child device 2 can be arranged. Next, the operation principle will be described.

(Operating principle)
The present inventor found that the transmission power is the volume integral of the inner product of the magnetic field (magnetic flux density) formed by the parent device and the magnetic field component produced by the child device and having a phase shifted by 90 degrees from the magnetic field of the parent device. I found it dependent. For example, the magnetic field of the slave unit is made to reach a magnetic field region (ferromagnetic region) formed by the magnetic field of the base unit, and energy is transmitted by the interaction of these magnetic fields.

Specifically, as shown in Expression (1), energy transfer occurs due to the overlap between the magnetic field formed by the coil of the parent device and the magnetic field generated by the coil of the child device.
Here, in Expression (1), Power represents transmission power. A vector B _p (in the expression (1), a vector symbol is attached) represents a magnetic field (magnetic field) formed by the parent device, and each component of the vector represents a magnetic field of each component of the space. A vector Bc (in the formula (1), a vector symbol is attached) represents a magnetic field generated by the slave unit, and each component of the vector represents a magnetic field of each component of the space. In Equation (1), Re represents a real part, j represents an imaginary number, ω represents a resonance frequency, and μ ₀ represents a vacuum permeability. Here, jω represents time differentiation. In Expression (1), the vector B _p · Bc represents the inner product of the vector B _p and the vector Bc, * represents the complex conjugate, and the integral represents the spatial integral.

  This indicates that energy transmission occurs even if the magnetic field of the master unit does not contact the coil of the slave unit. This does not mean that there is no magnetic field in the energy transmission path from the parent device to the child device. In other words, when energy is being transmitted, even if there is no magnetic field formed by the master unit on the transmission path formed in the guard area, etc., there is a magnetic field created by the slave unit, so energy is transmitted by that magnetic field. It is.

Here, even if a magnetic field generated by the slave unit exists on the transmission path, as long as the slave unit is in contact with a surface such as a floor, the magnetic field does not touch the human body. The same can be said for the case where the magnetic field itself formed by the base unit exists on the transmission path.
However, in a scene (scene) in which a plurality of antennas spread over a wide range are used as the antenna configuration of the master unit, the master unit covers a wider range than the slave unit antenna by the master unit antenna. For this reason, energy transmission with a magnetic field of 0 cannot be realized on a surface such as a floor other than the place where the handset exists.
In such a situation, it is desirable that the magnetic field of the base unit be a weak magnetic region where the magnetic field of the base unit is rapidly attenuated on the floor or the like, and the magnetic field of the slave unit is deep and reaches the strong magnetic region.

(Example of power supply system)
FIG. 2 is a schematic diagram illustrating a specific example of a power feeding system according to an embodiment of the present invention. In this figure, the X axis and Y axis are the horizontal direction, and the Z axis is the vertical direction.
In the power supply system, in a conference room or the like, the antenna unit 11 of the base unit 1 is installed inside the floor 101 (in this embodiment, a portion below the floor 101 from the surface of the floor 101). The antenna unit 51 of the handset 2 is provided on each of a plurality of (two in this embodiment) legs 102-1 and 102-2 of the table 102. Each of the legs 102-1 and 102-2 of the table 102 includes rod-like members 102-1-1 and 102-2-1 extending in a direction perpendicular to the surface of the table 102, and the members 102-1-1. , 102-2-1 comprising rod-shaped members 102-1-2 and 102-2-2 extending in the horizontal direction with respect to the surface of the table 102 attached to the bottom (the side opposite to the surface of the table 102). Has been.
In the example of FIG. 2, three notebook personal computers (PCs) 104-1 to 104-3 are arranged on the table 102, and each user 103-1 to 103-3 is operated. doing. In the present embodiment, the power output from the power output unit 62 of the power receiving unit 52 of the slave unit 2 is supplied to the PCs 104-1 to 104-3 via, for example, a power cable (not shown).

FIG. 3 is a diagram illustrating a configuration of the antenna unit 11 of the parent device 1 installed in the floor 101 according to the embodiment of the present invention. In this figure, the X-axis, Y-axis, and Z-axis are the same as those in FIG.
The antenna unit 11 of the base unit 1 has a configuration in which double coils are spread below the surface of the floor 101. This double coil is composed of an upper coil (first layer) 151 and a lower coil (second layer) 152, assuming that the upper side (Z-axis direction) is perpendicular to the surface of the floor 101. It is configured. The first layer 151 and the second layer 152 have the same shape including the winding direction of the coil, and are arranged so that the shapes overlap vertically.

As an example, the first layer 151 has a configuration in which a plurality of single coils 151-ij are arranged at equal intervals in the X-axis direction and the Y-axis direction. Here, i and j are natural numbers. The single coil 151-ij represents the i-th single coil in the X-axis direction and the j-th single coil in the Y-axis direction in the first layer 151.
The second layer 152 has a configuration in which a plurality of single coils 152-kl are arranged at equal intervals in the X-axis direction and the Y-axis direction, respectively. Here, k and l are natural numbers. The single coil 151 -kl represents the k-th single coil in the X-axis direction and the l-th single coil in the Y-axis direction in the second layer 152. That is, as shown in FIG. 3, the double coil in which the single coil 151-ij of the first layer 151 and the single coil 152-ij of the second layer 152 face each other has an X-axis direction and a Y-axis direction. Are arranged at equal intervals.

  Each of the single coil 151-ij and the single coil 152-kl has, for example, a diameter of 30 cm and the same direction in which the electric wire is wound. The separation distance (intercoil distance; gap) between the first layer 151 and the second layer 152 is 2 cm. That is, the antenna unit 11 includes the electric wires of the first layer 151 and the electric wires of the second layer 152 that are opposed to each other with an interval (2 cm) smaller than the width (30 cm) of the single coil 151-ij. Both the electric wires of the first layer 151 and the electric wires of the second layer 152 facing each other in the Z-axis direction are supplied with currents having the same amplitude and opposite directions. As an example, this current is alternating current and its frequency is 13.56 MHz.

  In such a configuration of the antenna unit 11, a magnetic field is formed between the upper first layer 151 and the lower second layer 152, and the upper portion of the first layer 151 and the second layer 152 It does not leak so much to the bottom. This is because the magnetic field generated by the coil of the first layer 151 and the magnetic field generated by the coil of the second layer 152 by the current flowing by the magnetic field control unit 61 are opposed to each other (the first layer 151 (second layer The magnetic field is generated so that the component in the normal direction (152); the Z-axis direction in FIG. Thereby, in the region between the first layer 151 and the second layer 152, the magnetic field generated from the first layer 151 and the magnetic field generated from the second layer 152 strengthen each other. Become. On the other hand, in the upper region of the first layer 151 and the lower region of the second layer 152, the magnetic field generated from the first layer 151 and the magnetic field generated from the second layer 152 weaken each other, and the weak magnetic region Become. The direction of the magnetic field formed in the strong magnetic region is preferably parallel or substantially parallel to the surface of the floor 101.

  In this configuration example, the plurality of double coils are arranged at equal intervals in the X-axis direction and the Y-axis direction. However, as another configuration example, at least one of the X-axis direction and the Y-axis direction is used. In the above, a configuration in which the lines are arranged at intervals other than equal intervals may be used. Further, for the single coil 151-ij and the single coil 152-ij facing each other, the direction in which the electric wire is wound is the same in this configuration example, but as another configuration example, the direction in which the electric wire is wound is the reverse direction. Also good. However, the first layer 151 and the second layer 152 facing each other in the Z-axis direction are configured such that currents having the same amplitude and opposite directions flow in both of the wires.

FIG. 4 is a diagram illustrating a configuration of the antenna unit 51 of the slave unit 2 provided on the leg 102-1 of the table 102 according to the embodiment of the present invention. In this figure, the X-axis, Y-axis, and Z-axis are the same as those in FIG.
The member 102-1-2 of the leg 102-1 of the table 102 arranged on the surface side of the floor 101 has a rod shape along the surface of the floor 101, and the antenna unit 51 of the slave unit 2 is formed inside the member 102-1-2. It has. The antenna unit 51 of the slave unit 2 is composed of a coil in which an electric wire 202 is wound around a rod-shaped ferrite core 201 embedded in the rod-shaped member 102-1-2. The ferrite core 201 is a rod-shaped ferrite core along the surface of the floor 101 in the arrangement of the table 102. Moreover, the length of this coil is shorter than member 102-1-2, and is arrange | positioned in the center vicinity of member 102-1-2. Thereby, it can suppress that the magnetic field which generate | occur | produces from the antenna part 51 leaks outside other than the lower surface (surface by the side of the floor 101) of member 102-1-2. The other leg 102-2 of the table 102 has the same configuration as the leg 102-1.

[First Embodiment]
1st Embodiment is described about the electric power feeding system shown by FIGS.
FIG. 5 is a diagram showing an arrangement relationship between the magnetic field 301 of the parent device 1 and the magnetic field 302 of the child device 2 according to the first embodiment of the present invention. In this figure, the Y-axis and Z-axis are the same as those in FIG.

In FIG. 5, the antenna unit 11 of the base unit 1 includes a single coil 151 -Mj (M is a fixed value; j = 1, 2, 3) of the first layer 151 and a single coil 152 -Mj of the second layer 152. Is composed of double coils facing each other.
FIG. 5 shows a magnetic field 301 formed by a part of base unit 1, that is, single coils 151-M1 to M3 and single coils 152-M1 to M3. Note that the magnetic field 301 formed between the layer formed by the first layer 151 and the layer formed by the second layer 152 (ferromagnetic region) is also referred to as an in-layer magnetic field 301.
As an example, the single coils 151-M1 and 151-M3 form windings in the same direction as viewed from above, and currents in opposite directions are passed through (single coils 152-M1 and 152-M3). In this case, when magnetic fields from the single coil 151-M1 and the single coil 152-M1 to the strong magnetic region are formed, magnetic fields from the strong magnetic region to the single coil 151-M3 and the single coil 152-M3 are formed. The Thereby, for example, an in-layer magnetic field 301 parallel to the first layer 151 and the second layer 152 is formed between the single coil 151-M2 and the single coil 152-M2. If the phases of the currents flowing through the single coils 151-M1, 151-M2, 151-M3 are shifted by 90 degrees, interference of magnetic fields from adjacent coils (for example, the single coils 151-M1, 151-M2) can be prevented. Can weaken. When there is no magnetic field interference from adjacent single coils, the magnetic field leaks in the vertical direction, but when the distance between the coils of the antenna unit 11 is small, it rapidly attenuates in the vertical space. This indicates that by providing a guard region, which will be described later, it can be lowered to a level where magnetic field leakage does not become a problem in practice. Further, leakage from the outer periphery of the coil is originally small in magnetic field strength. Furthermore, when the magnetic permeability of the antenna unit 11 is larger than the magnetic permeability of vacuum, the magnetic field leakage to the upper and lower surfaces is still small. Furthermore, if a coil is formed as shown in FIG. 12 described later, the magnetic field can be completely confined.
In the single coils 151-Mj, 152-Mj, the coil central portion (for example, a portion within a radius of 5 cm from the center of the coil) is not wound, in other words, the peripheral portion of the coil (for example, the coil) The coil may be wound only on a portion that is separated from the center by a radius of 5 cm. In the central portion of the coil, the magnetic field may leak in the vertical direction as compared with the peripheral portion. By not winding a coil around the central part of the single coils 151-Mj, 152-Mj, there are cases where leakage of a magnetic field can be prevented as compared with a case where a coil is wound around the central part.

  FIG. 5 shows a magnetic field 302 created by the handset 2. Here, the subunit | mobile_unit 2 is producing | generating the magnetic field which has a component of the same direction as the in-layer magnetic field 301 in a strong magnetic field. Further, the slave unit 2 generates a magnetic field 302 having a component that is 90 degrees out of phase with the in-layer magnetic field 301. For example, the subunit | mobile_unit 2 shifts the phase of the magnetic field 302 by shifting the phase of the alternating current sent through the coil of the antenna part 51. The subunit | mobile_unit 2 can enlarge the component which a phase differs from the in-layer magnetic field 301 by fixing the phase after detecting the phase where electric power feeding increases most. Thereby, the subunit | mobile_unit 2 can raise the electric power feeding efficiency from the main | base station 1. FIG.

FIG. 6 is a diagram illustrating a specific example of an arrangement relationship between the in-layer magnetic field 301 of the parent device 1 and the magnetic field 302 of the child device 2 according to the first embodiment of the present invention. This specific example is adapted to the specific example of the power supply system shown in FIG. For example, the Y axis and the Z axis are the same as those in FIG.
A first layer 151 and a second layer 152 are provided below the surface of the floor 101, and a bar-like member 102-1 perpendicular to the surface of the floor 101 is provided above the surface of the floor 101. -1 and a leg (a leg of the table 102) 102-1 composed of a horizontal bar-shaped member 102-1-2 is placed.

Here, as described above, the antenna unit 11 of the base unit 1 composed of double coils installed on the floor 101 is mainly composed of the in-layer magnetic field 301 parallel to the longitudinal direction of the floor 101 and the member 102-1-2. Form. In addition, on the upper side of the floor 101, the magnetic field of the base unit 1 cancels and becomes small. Further, the antenna unit 51 of the slave unit 2 made of a coil provided on the rod-like member 102-1-2 of the leg 102-1 of the table 102 creates a magnetic field 302 having a component parallel to the surface of the floor 101.
As shown in FIG. 6, the magnetic field 302 is limited to the ring-shaped region and reaches the surface of the floor 101. There is no gap between the handset 2 and the floor 101 for a human body or the like to enter. As described above, in the power feeding system, the magnetic field of the master unit 1 is small above the floor 101, and there is no gap for the human body to enter between the slave unit 2 and the floor 101. , Magnetic field hardly leaks out. Thereby, the power feeding system can feed power from the parent device 1 to the child device 2 while suppressing a magnetic field in a space where a human body or the like exists.

The base unit 1 may converge the in-layer magnetic field 301 to a position where the leg 102-1 of the table 102 is located (that is, a position where the antenna unit 51 of the handset 2 is located). For example, when a large number of power supplies are provided around the conference room, the master unit 1 converges the in-layer magnetic field 301 of the master unit 1 by adjusting the phase and amplitude of these power sources.
When a plurality of master units 1 or single coils are provided, the coils or single coils between the master units 1 may be designed so as to resonate at the operating frequency. As a result, electromagnetic energy is transmitted (energy hopping) between the base unit 1 and the single coil. In order to obtain this resonance, a capacitor may be incorporated in the antenna unit 11 of the base unit 1. By transmitting electromagnetic energy in this way, even if the base unit 1 or a part of the single coil is not connected to the power source, it receives energy from the other base unit 1 or the single coil, and a part of the energy. Can be transmitted to another master unit 1, a single coil, or a slave unit 2.

As described above, in the power supply system according to the first embodiment, the coil (in this embodiment, a double coil) that configures the antenna unit 11 of the parent device 1 is installed under the floor 101. That is, a strong magnetic field in which the magnetic fields are strengthened is generated inside the antenna unit 11 of the parent device 1, and a weak magnetic region in which the magnetic fields are weakened is generated outside the antenna unit 11 of the parent device 1. In other words, the magnetic field leaking from the coil onto the surface of the floor 101 is a sufficiently weak magnetic field for protection of human bodies and the like.
Further, an in-layer magnetic field 301 formed under the floor 101 by a coil constituting the antenna unit 11 of the base unit 1 from a coil constituting the antenna unit 51 of the slave unit 2 provided substantially in contact with the surface of the floor 101. The magnetic field 302 having a component parallel to the in-layer magnetic field 301 and having a component that is 90 degrees out of phase is generated at the position. As a result, power energy is transmitted from the parent device 1 to the child device 2. That is, the subunit | mobile_unit 2 produces | generates the magnetic field which is arrange | positioned at a weak magnetic field and reaches | attains a strong magnetic field. The magnetic field generated by the parent device 1 and the magnetic field generated by the child device 2 in the strong magnetic field have components that are parallel to each other and have components that are 90 degrees out of phase with each other.
In this embodiment, the members 102-1-2 and 102-2-2 constituting the legs 102-1 and 102-2 of the table 102 are in contact with the surface of the floor 101, and the antenna unit 51 of the slave unit 2 is It is provided inside the members 102-1-2 and 102-2-2. For this reason, the antenna part 51 of the subunit | mobile_unit 2 does not contact directly with the surface of the floor | bed 101, but substantially contacts.

  Further, in the power feeding system according to the first embodiment, the antenna unit 11 of the base unit 1 is composed of two layers of coil groups laid on the surface of the floor 101, and these two layers of coil groups are arranged on the surface of the floor 101. On the other hand, the coil surfaces are opposed to each other in the vertical direction, and the coil group of each layer is formed by arranging a plurality of coils, and the magnetic field (in-layer magnetic field) of the parent device 1 is formed between these two layers of coil groups. The antenna unit 51 of the handset 2 placed on the surface of the floor 101 forms a magnetic field having a component parallel to the in-layer magnetic field of the base unit 1 in the layer, and the frequency of the magnetic field of the handset 2 is the base unit. The phase is the same as the frequency of one in-layer magnetic field, but the phase is different.

  Further, in the power feeding system according to the first embodiment, the antenna unit 11 of the parent device 1 is configured by a plurality of coils laid on the surface of the floor 101, and the power source of the parent device 1 (the power feeding unit 12 in this embodiment). Is smaller in number than the coil, and electromagnetic energy is transmitted between the coils, so that power energy is transmitted from the power source smaller than the coil to the coil near the antenna unit 51 of the slave unit 2.

As described above, in the power feeding system according to the first embodiment, the coils constituting the antenna unit 11 of the base unit 1 are doubled up and down, and currents in directions opposite to each other are caused to flow in the layers by the upper and lower coils. A strong magnetic field parallel to the surface of the floor 101 is formed, and the strength of the magnetic field is rapidly attenuated outside the layer. Further, the magnetic field of the child device 2 is formed so as to have a component parallel to the magnetic field of the parent device 1. Thereby, on the surface of the floor 101, it is possible to realize a configuration example in which the magnetic field of the parent device 1 is rapidly attenuated and the magnetic field of the child device 2 reaches the in-layer magnetic field region of the parent device 1 deeply. .
Therefore, in the power feeding system according to the first embodiment, power can be supplied from the parent device 1 to the child device 2 while suppressing a magnetic field in a region where the child device 2 can be arranged.

[Second Embodiment]
2nd Embodiment is described about the electric power feeding system shown by FIGS. 1-4.
The power supply system according to the second embodiment has a configuration in which a guard region is further provided in the same configuration as the power supply system according to the first embodiment. For this reason, in the second embodiment, the same components as those in the first embodiment will be described with the same reference numerals, and detailed description of the same configurations and effects as those in the first embodiment will be omitted.
The guard area is an area where resin such as Zetron (http://www.sekisui.co.jp/search/detail-2724.html; registered trademark), wood, glass, or the like is placed. As the object placed as the guard region, an object that does not shield the magnetic field or electric field created by the child device 2 is preferable. As such an object, for example, an object having a low electric conductivity is preferable compared to a metal having a high electric conductivity.

FIG. 7 is a diagram showing an arrangement relationship between the in-layer magnetic field 301 of the parent device 1 and the magnetic field 302G of the child device 2 when the guard region 401 according to the second embodiment of the present invention is provided.
FIG. 7 shows the in-layer magnetic field 301 formed by a part of the base unit 1, that is, the single coils 151-M1 to M3 and the single coils 152-M1 to M3. FIG. 7 shows a magnetic field 302G created by the slave unit 2. The subunit | mobile_unit 2 can make the magnetic field 302G exceeding the guard area | region 401. FIG. In this case, a part of the guard area 401 becomes paths (transmission paths) 501-1 and 501-2 through which power energy is transmitted from the parent device 1 to the child device 2.

FIG. 8 is a diagram illustrating a specific example of an arrangement relationship between the in-layer magnetic field 301 of the parent device 1 and the magnetic field 302G of the child device 2 when the guard region 401 according to the second embodiment of the present invention is provided. This specific example is adapted to the specific example of the power supply system shown in FIG.
With respect to the example of FIG. 8 in the case where the guard region 401 is provided, a different part from the example of FIG. 6 in the case where the guard region is not provided will be described.
That is, in the example of FIG. 8, a region (guard region) 401 is provided between the first layer 151 and the rod-like member 102-1-2 of the leg 102-1 of the table 102. This area 401 is to prevent intrusion of a human body or the like into the transmission path of power energy (routes 501-1 and 501-2 in FIG. 7) from the parent device 1 to the child device 2. Further, the distance between the in-layer magnetic field 301 and the antenna unit 51 of the slave unit 2 can be kept at a predetermined distance or more by the height of the region 401.
The antenna unit 51 of the handset 2 formed of a coil provided on the rod-shaped member 102-1-2 of the leg 102-1 of the table 102 creates a magnetic field 302G parallel to the floor 101. As shown in FIG. 8, the magnetic field 302G is limited to a ring-shaped region and reaches the surface of the floor 101, but does not leak into a space where a human body exists.

  As described above, in the power feeding system according to the second embodiment, a coil (in this embodiment, a double coil) that configures the antenna unit 11 of the base unit 1 is installed under the floor 101, and the floor extends from this coil. The magnetic field leaking onto the surface 101 is a sufficiently weak magnetic field for protection of human bodies and the like. Further, the antenna unit 11 of the base unit 1 is configured from a coil that configures the antenna unit 51 of the handset 2 that is isolated by a distance (guard region 401) that does not leave room for a human body or the like to enter the surface of the floor 101. A magnetic field 302G having a component parallel to the in-layer magnetic field 301 and having a component different in phase by 90 degrees is generated at the position of the in-layer magnetic field 301 formed by the coil to be formed below the floor 101. As a result, power energy is transmitted from the parent device 1 to the child device 2.

As described above, in the power feeding system according to the second embodiment, the guard region (the region that prevents the intrusion of a human body or the like) 401 is provided on the upper part of the coil that constitutes the antenna unit 11 of the base unit 1, and the guard region 401 is located inside the guard region 401. An object can be prevented from entering.
Therefore, in the power feeding system according to the second embodiment, the efficiency of power feeding from the parent device 1 to the child device 2 can be improved.

[Third Embodiment]
A third embodiment of the power supply system will be described.
The power feeding system according to the third embodiment has the same configuration as that of the power feeding system according to the first embodiment except for the antenna unit 11 of the parent device 1. For this reason, in the second embodiment, the same components as those in the first embodiment will be described with the same reference numerals, and detailed description of the same configurations and effects as those in the first embodiment will be omitted.

FIG. 9 is a diagram illustrating a configuration of the antenna unit 11a of the parent device 1 installed inside the floor 101 according to the third embodiment of the present invention. In this figure, the X-axis, Y-axis, and Z-axis are the same as those in FIG.
The antenna unit 11a of the base unit 1 has a configuration in which single coils 15-i are spread below the surface of the floor 101. Here, i is a natural number and represents the order in the X direction as described above. The single coil 15-i is formed by winding an electric wire in a rectangular shape with the axis in the Y-axis direction as the center.

FIG. 10 is a front view of the antenna unit 11a according to the third embodiment of the present invention. In this figure, the X-axis, Y-axis, and Z-axis are the same as those in FIG. In this figure, the single coil 15-i has a rectangular shape. Note that the single coil 15-i is not a closed region on the XZ plane because the wire is wound while moving in the Y-axis direction.
In FIG. 10, the antenna unit 11a is configured such that the upper side of the floor 101 (Z-axis direction) is the upper side, and the upper side electric wire group (first layer) 151a and the lower side electric wire group (first 2 layers) 152a. Here, the first layer 151a and the second layer 152a have the same shape and are arranged so that the shapes overlap vertically.

  Both the electric wires of the first layer 151a and the electric wires of the second layer 152a facing each other in the Z-axis direction are supplied with currents having the same amplitude and opposite directions. For example, a current indicated by an arrow is passed through the single coil 15-4. In such a configuration of the antenna unit 11a, the magnetic field generated by the coil of the first layer 151a and the magnetic field generated by the coil of the second layer 152a by the current flowing through the magnetic field control unit 61 are opposed to each other (first A magnetic field is generated so that the component in the normal direction of the first layer 151a (second layer 152a); the Z-axis direction in FIG. Thereby, a magnetic field is formed inside the single coil 15-i, that is, between the upper first layer 151a and the lower second layer 152a, and this region becomes a ferromagnetic region. On the other hand, the magnetic field does not leak so much to the outside of the single coil 15-i, the upper part of the first layer 151a and the lower part of the second layer 152a, and this region becomes a weak magnetic region. In the strong magnetic region, an in-layer magnetic field 301 a that is mainly parallel to the XY plane, that is, parallel to the floor 101 is generated.

FIG. 11 is a cross-sectional view of a single coil 15-4 according to a third embodiment of the present invention. This figure is a cross-sectional view taken along the line AA ′ of FIG. In this figure, the X-axis, Y-axis, and Z-axis are the same as those in FIG.
In this figure, a current in the positive direction of the X axis flows through the electric wire of the first layer 151a. On the other hand, a current in the negative direction of the X axis flows through the electric wires of the second layer 152a. In this case, an in-layer magnetic field 301 a that is mainly parallel to the XY plane, that is, parallel to the floor 101 is generated in the strong magnetic region.

  FIG. 12 is a top view of an antenna unit 11b according to a modification of the third embodiment of the present invention. As shown in FIG. 12, the single coil 15-i in FIG. 9 may be viewed as a material having a high magnetic permeability. Further, by covering the end portion of the single coil 15-i with the substance (core), the magnetic field may be confined in the coil without leaking to the outside. In FIG. 12, a substance having a high magnetic permeability is represented by hatching.

[Modification]
In the above embodiment, the configuration in which the coils constituting the antenna units 11 and 11a of the base unit 1 are provided on the surface of the floor 101 is shown. However, as another configuration example, other than the floor such as a desktop table surface, etc. A configuration in which coils are provided on the surfaces of various objects may be used.
Moreover, in the above embodiment, the structure which provided the coil which comprises the antenna part 51 of the subunit | mobile_unit 1 in member 102-1-2 to 102-2-2 of the leg 102-1 to 102-2 of the table 102 is shown. However, as another configuration example, a configuration in which a coil is provided on various objects other than the legs of the table may be used.

  Further, in the above embodiment, the coils constituting the antenna units 11 and 11a of the base unit 1 are arranged in two directions perpendicular to the surface on which the antenna units 11 and 11a are provided (in this embodiment, the surface of the floor 101). A structure in which a coil having a layer (a coil in each layer is a coil group including a plurality of coils) or a coil having a two-layer electric wire group is provided, and a magnetic field (intra-layer magnetic field) of the base unit 1 is formed between the layers. Indicated. However, as another configuration example, three or more layers of coils in a direction perpendicular to the surface on which the antenna portions 11 and 11a are provided (the coils of each layer may be one coil or a coil group including a plurality of coils). Alternatively, an electric wire group of three or more layers (for example, even layers) is provided, and among these layers, any one layer (first layer) and any other one layer (second layer) A configuration in which the magnetic field (intra-layer magnetic field) of the parent device 1 is formed between them can also be used. As described above, as the arrangement of the coils constituting the antenna units 11 and 11a of the master unit 1, a multi-layer coil is provided, and the master unit is provided only between the first layer and the other second layer in the multilayer. A configuration in which one magnetic field (in-layer magnetic field) is formed can be used.

  Further, as a configuration in which the coil is provided on the surface such as the floor 101, for example, a configuration in which the coil is provided on the same surface as the floor 101 or the like may be used. 101) or the like may be used. For example, when a multilayer coil is provided in a direction perpendicular to the surface such as the floor 101, the coils of layers other than the layer closest to the upper side of the surface such as the floor 101 are provided below the surface such as the floor 101. The coil of the layer closest to the upper side of the surface such as the floor 101 may be provided on the same surface as the surface such as the floor 101, or may be provided on the lower side of the surface such as the floor 101.

  Moreover, in the above embodiment, although the coil which comprises the antenna parts 11 and 11a of the main | base station 1 was a rectangular shape, this invention is not limited to this, For example, a circle | round | yen and an ellipse shape may be sufficient. . For example, the single coils 151-ij, 152-kl, and the single coils 15-i may have a spiral shape.

Moreover, in the above embodiment, the main | base station 1 or the subunit | mobile_unit 2 may adjust the direction of the magnetic field in a strong magnetic field so that a mutual parallel component may increase. As an example, mutually opposite currents are passed through the single coils 151-M1 and 151-N3 (single coils 152-M1 and 152-N3) (N ≠ M). In this case, when magnetic fields from the single coil 151-M1 and the single coil 152-M1 to the strong magnetic region are formed, magnetic fields from the strong magnetic region to the single coil 151-M3 and the coil 152-N3 are formed. . That is, the in-layer magnetic field can be tilted in the X-axis direction by the diameter of the single coil × (MN).
For example, the base unit 1 sequentially changes the direction of the in-layer magnetic field. Specifically, base unit 1 sequentially changes the combination of two single coils 151-ij that cause currents in opposite directions to flow. Master unit 1 detects the direction in which the power supply to slave unit 2 is the largest (the direction in which combined single coils 151-ij are connected), and thereafter, the direction of the in-layer magnetic field is fixed (the positive / negative direction may change). ) In addition, the main | base station 1 may change the direction of the magnetic field in a layer using the combination of three or more single coils 151-ij. In addition, after determining the direction, base unit 1 may change the position of the in-layer magnetic field by changing single coil 151-ij through which a current flows.

Moreover, in the above embodiment, the magnetic field control unit 61 of the slave unit 2 may generate a magnetic field using the power received from the master unit 1. For example, base unit 1 periodically forms a magnetic field on the upper side of floor 101. This magnetic field reaches a coil provided in the child device 2 and changes, thereby supplying electric power to the child device 2. Then, the subunit | mobile_unit 2 forms the magnetic field which reaches | attains a ferromagnetic region with the supplied electric power. Thereafter, base unit 1 stops forming a magnetic field on the upper side of floor 101.
Further, for example, the parent device 1 may have a function of detecting the child device 2 (for example, realized by weight detection or near field communication detection). When the child device 2 is detected, the parent device 1 may form a magnetic field on the upper side of the floor 101 as described above.

  Further, in the above embodiment, the same effect can be obtained with respect to what has been described that arbitrary properties such as two components or two signals (for example, a magnetic field) are the same or have a predetermined relationship. A substantially identical configuration or a configuration having a substantially predetermined relationship may be used, that is, a slight difference in implementation may be allowed.

Moreover, the main | base station 1 may be a building member embedded in a floor or a wall. That is, the building member includes a first layer and a second layer spaced apart in a direction perpendicular to the floor or wall, and the magnetic field generated by the coil of the first layer and the second layer In the magnetic field generated by the coil, the component in the vertical direction (which is also the direction in which the first layer and the second layer face each other) is reversed. For example, electric currents in opposite directions flow through the electric wires in the first layer and the electric wires in the second layer that are opposed in the vertical direction.
In addition, in the above embodiment, the electric wire which opposes may mean the electric wire with the shortest distance in the other layer about the electric wire of one layer. The electric wire may mean a part of the electric wire, that is, a line segment. Further, the reverse current may mean a current that flows in the opposite direction in the direction in which the electric wire extends with respect to the opposite electric wire.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  In addition, a program for realizing the functions of the devices according to the above-described embodiments (for example, the master unit 1 and the slave unit 2) is recorded on a computer-readable recording medium, and the program recorded on the recording medium May be performed by causing the computer system to read and execute the program.

The “computer system” referred to here may include an operating system (OS) and hardware such as peripheral devices.
The “computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disk), A storage device such as a hard disk built in a computer system.

Further, the “computer-readable recording medium” refers to a volatile memory (for example, DRAM (DRAM)) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. Dynamic Random Access Memory)) that holds a program for a certain period of time is also included.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting a program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the above program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Master unit, 2 ... Slave unit, 11, 11a, 11b, 51 ... Antenna part, 12 ... Feeding part, 21, 61 ... Magnetic field control part, 62 ... Electric power output part, 101 ... Floor, 102 ... Table, 102- 1-102-2 ... Table leg, 102-1-1, 102-2-1, 102-1-2, 102-2-2 ... Table leg member, 103-1 to 103-3 ... User, 104-1 to 104-3 ... Personal computer, 151-1, 151-2, 152-1, 152-2, 15-1 to 15-4 ... Coil, 151, 151a, 152, 152a ... Layer, 201 ... Bar shape Ferrite core, 202 ... Electric wire, 301 ... Main unit magnetic field, 302, 302G ... Slave unit magnetic field, 401 ... Guard region, 501-1 to 501-2 ... Transmission path

Claims (8)

A main unit that generates a strong magnetic field in which the magnetic fields are strengthened inside the object, and a weak magnetic field in which the magnetic fields are weakened outside the object;
A slave unit that is disposed in the weak magnetic region and generates a magnetic field that reaches the strong magnetic region;
Have
The magnetic field generated by the parent device in the strong magnetic field and the magnetic field generated by the child device have components parallel to each other and have components that are 90 degrees out of phase with each other, so that the parent device to the child device. Power supply system that supplies power. The base unit is
A master unit antenna unit comprising a coil disposed on one side of the surface of the object;
A master magnetic field control unit that generates the ferromagnetic region inside the coil of the master antenna unit;
The slave is
A handset antenna unit comprising a coil disposed on the other side of the surface of the object;
The power supply system according to claim 1, further comprising: a child device magnetic field control unit that generates a magnetic field that reaches the ferromagnetic region beyond the surface by the coil of the child device antenna unit. The base unit antenna unit includes the coils facing each other at an interval smaller than the width of the coil,
The base unit magnetic field control unit generates a magnetic field so that the components in the opposite directions are opposite to each other for the magnetic field generated by the first layer coil and the magnetic field generated by the second layer coil. The strong magnetic region is generated on the inner side between the first layer and the second layer, and the weak magnetic region is generated on the outer side of the first layer and the second layer. 2. The power supply system according to 2. The base antenna unit includes a first layer and a second layer that are spaced apart in a direction perpendicular to the surface of the object,
The base unit magnetic field control unit generates a magnetic field generated by the first layer coil and a magnetic field generated by the second layer coil so that components in the vertical direction are opposite to each other. Thus, the strong magnetic region is generated on the inner side between the first layer and the second layer, and the weak magnetic region is generated on the outer side of the first layer and the second layer,
The magnetic field generated by the main unit antenna unit and the magnetic field generated by the sub unit antenna unit have components having the same frequency, components parallel to each other, and components having phases different from each other by 90 degrees. The electric power feeding system of any one of Claim 2 or Claim 3 which has.   The base unit antenna unit of the base unit is formed by arranging a plurality of coils parallel to the surface of the object, and is smaller in number than the plurality of coils due to a magnetic field hopping phenomenon on the plurality of coils. The power supply system according to any one of claims 2 to 4, wherein electric power energy is transmitted from a power source to a coil in the vicinity of the handset antenna unit of the handset.   The guard area | region which is an area | region which prevents an intrusion thing was provided in the said other side of the surface of the said object between the said subunit | mobile_unit antenna part of the said subunit | mobile_unit. The power feeding system described in 1. The base unit generates a strong magnetic field where the magnetic fields are strengthened inside the object, and a weak magnetic field where the magnetic fields are weakened outside the object.
A handset is disposed in the weak magnetic region, and generates a magnetic field that reaches the strong magnetic region;
The magnetic field generated by the parent device in the strong magnetic field and the magnetic field generated by the child device have components parallel to each other and have components that are 90 degrees out of phase with each other, so that the parent device can move from the parent device to the child device. A power supply method for supplying power. Comprising a first layer and a second layer spaced apart in a direction perpendicular to the floor or wall;
A building member configured such that a magnetic field generated by the first layer coil and a magnetic field generated by the second layer coil have components in the vertical direction opposite to each other.

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