CN112840523A - Power transmission coil, power receiving coil, and wireless power supply system - Google Patents
Power transmission coil, power receiving coil, and wireless power supply system Download PDFInfo
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- CN112840523A CN112840523A CN201980066377.8A CN201980066377A CN112840523A CN 112840523 A CN112840523 A CN 112840523A CN 201980066377 A CN201980066377 A CN 201980066377A CN 112840523 A CN112840523 A CN 112840523A
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- power
- power transmission
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- transmission coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
Abstract
The invention provides a power transmission coil, a power receiving coil and a wireless power supply system. When power is transmitted to a plurality of power receiving coils using one power transmission coil (2), the difference in power receiving power is suppressed. The wireless power supply system comprises two power receiving coils and a power transmission coil. The power transmission coil is a coil wound in the z-axis direction a plurality of times, and each turn is composed of two action portions and a connection portion connecting the action portions to the action portions. The action portion is disposed so as to surround the periphery of the power receiving coil. The cross-sectional area of the power receiving coil is set to 1/2 or less of the cross-sectional area of the action portion. The connecting portion is a portion connecting the operating portion and the operating portion, and is two linear wires extending in the x-axis direction. The connecting part is provided with a control part (22) which fixes the interval between the two wires (21a, 21b) to be invariable. In addition, when the power transmission coil is disposed in the housing, the power transmission coil is fitted into a groove in the outer wall of the housing.
Description
Technical Field
The present invention relates to a power transmission coil, a power reception coil, and a wireless power transmission system for transmitting power in a non-contact manner.
Background
In recent years, wireless power feeding technology for transmitting power in a non-contact manner has been widely studied and developed. Various wireless power supply methods have been proposed, including an electromagnetic induction method, a magnetic resonance method, and the like. Among them, the magnetic field resonance system is attracting attention. In the magnetic field resonance system, the degree of freedom of the relative arrangement of the power transmission coil and the power receiving coil is high, and a plurality of power receiving coils can be arranged within the range of influence of the power transmission coil. As an application thereof, a technology for wirelessly supplying power to a mobile communication terminal such as a smartphone, other electronic devices, and an electronic device for a vehicle is actively studied and developed.
For example, patent document 1 describes that two circular coils are connected in a figure of eight as a power transmission coil and a power reception coil of an electromagnetic induction system. It is described that such a shape can suppress unnecessary electromagnetic field radiation.
Further, patent document 3 discloses a technique for wirelessly supplying power to an operation unit of an air conditioner for air conditioning. By disposing the power transmission coil around the air conditioning register, electric power is supplied to the LED of the operation unit that adjusts the air direction of the air conditioning register (fig. 8 of patent document 3).
Patent document 1: japanese patent laid-open publication No. 2013-247822
Patent document 2: international publication No. 2017/169708
Patent document 3: japanese patent laid-open publication No. 2016-2921
However, when power is transmitted to a plurality of power receiving coils by one power transmission coil, a region with high power transmission efficiency and a region with low power transmission efficiency may occur due to variation in magnetic field strength, interference, or the like, and a difference may occur in the power received by each power receiving coil.
In a power transmission device used in a wireless power transmission system of the magnetic field resonance method, a resonance frequency is set based on the inductance L of a power transmission coil and the capacitance C of a capacitor, and the resonance frequency is similarly set in a power reception device. In the high frequency band, the inductance L is large and the capacitance C is small, so that the adjustment of the capacitance C of the capacitor needs to be strict. However, depending on the shape and arrangement of the power transmission coil and the power receiving coil, parasitic capacitance may occur in the coils, which may cause variation in inductance L, thereby resulting in a decrease in power transmission efficiency.
In addition, when power supply to an electronic component mounted in a vehicle is considered, the variety of the components mounted in the vehicle is large. Therefore, from the viewpoint of design, it is difficult to arrange the vehicle-mounted components in a limited space if the number of components is increased. Therefore, it is desired to develop a wireless power feeding system that can be disposed in a limited space and can efficiently feed power to an electronic device to be fed.
Disclosure of Invention
Therefore, an object of the present invention is to suppress a difference in power reception power between power reception coils in a wireless power transmission system that transmits power to a plurality of power reception coils through one power transmission coil. Another object of the present invention is to control a capacitance generated in a transmission coil or a reception coil in a wireless power transmission system of a magnetic resonance system. Another object of the present invention is to provide a power supply system that can be disposed in a limited space and can efficiently supply power to an electronic device to be supplied with power. Further, the objects of these inventions need not be satisfied simultaneously, but rather by the object of one feature in a plurality of inventions.
The present invention provides a wireless power feeding system which transmits power from a power transmission coil to a plurality of power receiving coils in a non-contact manner by a magnetic field resonance method, wherein the structure of each unit winding of the power transmission coil has a structure having an action portion arranged so as to surround the periphery of each power receiving coil and a connection portion for connecting between the action portions, and the cross-sectional area of each power receiving coil is 1/2 or less of the cross-sectional area of the action portion surrounding the power receiving coil.
In the present invention, the difference between the longest distance and the shortest distance from the center of each power receiving coil to the action portion surrounding the power receiving coil may be 8 times or less the diameter of the action portion. The power receiving power difference of each power receiving coil can be further reduced. When the transmitted power is 10W or less, the diameter of the power receiving coil is preferably 3 to 200mm, and the axial length of the power receiving coil is preferably 1 to 20 mm. The power receiving efficiency can be improved, and the power receiving difference can be further reduced. When the transmission power is 10W or less, the diameter of the transmission coil is preferably 10 to 400mm, and the axial length of the transmission coil is preferably 1 to 100 mm. The power receiving efficiency can be improved, and the power receiving difference can be further reduced.
Another aspect of the present invention provides a power transmission coil configured by wire materials for transmitting power in a non-contact manner by magnetic field resonance, the power transmission coil including an approaching portion where two of the wire materials approach a distance equal to or less than 1/10 of a diameter of the power transmission coil, and a control portion for controlling an interval between the two wire materials in the approaching portion to a predetermined distance.
Still another aspect of the present invention provides a power receiving coil configured by wire rods that receive electric power in a non-contact manner by magnetic field resonance, the power receiving coil including an approaching portion in which the two wire rods approach a distance equal to or less than 1/10 of a diameter of the power receiving coil, and a control portion that controls an interval between the two wire rods in the approaching portion to a predetermined distance.
In the present invention, the control unit may fix the interval between the two wires to a predetermined distance. The parasitic capacitance of the power transmission coil or the power receiving coil can be prevented from varying, and variation in the inductance of the coil can be suppressed even when variations in the shape, arrangement, and the like of the power transmission coil or the power receiving coil occur, thereby suppressing a decrease in power transmission efficiency.
In the present invention, the control unit may change the interval between the two wires. By adjusting the parasitic capacitance of the power transmission coil or the power reception coil, even if the inductance of the coil varies due to variations in the shape, arrangement, or the like of the power transmission coil or the power reception coil, the inductance can be adjusted, and variations in the resonance frequency of the power transmission-side circuit or the power reception-side circuit can be corrected. This also enables the power transmission efficiency or the power reception efficiency to be varied as intended.
Another aspect of the present invention provides a wireless power supply system including: an air-core power transmission coil, a power receiving coil, a device surrounded by a frame, and an electronic component driven by power from the power receiving coil. The frame has a groove or a support member on an outer wall of the frame. The power transmission coil is fixed to the groove or the support member of the frame. The power receiving coil is disposed inside the housing or on the surface of the housing. The wireless power feeding system can arrange a power transmission coil in a limited space such as the inside of a vehicle and can effectively feed power to an electronic device to be fed. In fact, when the operator incorporates the wireless power feeding system in the vehicle, the operator can easily perform the work. In addition, the relative position of the power transmission coil and the housing can be reliably positioned. Therefore, there is little concern that the relative positional relationship between the power transmission coil and the power reception coil will vary from batch to batch.
The power transmission coil may have four sides surrounding the housing. At least one of the four sides of the power transmission coil may also protrude toward the power receiving coil. The electronic component is arbitrary, and is, for example, a light-emitting device. The device surrounded by the housing may have an operation unit for operating the device surrounded by the housing. The operation unit may include a power receiving coil and a light emitting device. The power transmission coil may also be formed as a wire. The current flowing through the electronic component is preferably 1mA or less. The power transmission coil and the power receiving coil can also be in a magnetic field coupling type. The housing may also form a housing of an air conditioner register. The slot or support member of the frame does not completely cover the power transmission coil, and at least a part of the power transmission coil may be in contact with the atmosphere.
According to one aspect of the present invention, the difference in power reception power between the power reception coils can be suppressed. In addition, according to another feature, the parasitic capacitance of the power transmission coil or the power reception coil can be adjusted. In addition, according to another feature, power can be efficiently supplied to the electronic device to be supplied with power while being arranged in a limited space.
Drawings
Fig. 1 is a schematic diagram showing an interior of a vehicle according to a first embodiment.
Fig. 2 is a schematic diagram showing a schematic configuration of the wireless power supply system according to the first embodiment.
Fig. 3 is (one of) a diagram showing a fixed state of the power transmission coil and the housing in the first embodiment.
Fig. 4 shows a (second) state in which the power transmission coil and the housing of the first embodiment are fixed to each other.
Fig. 5 is a partial sectional view showing a part of the V-V section of fig. 4.
Fig. 6 is a diagram showing the shape of the power transmission coil according to the first embodiment.
Fig. 7 is a perspective view showing a positional relationship between the power receiving coil and the light emitting device according to the first embodiment.
Fig. 8 is a diagram schematically showing a circuit of the wireless power supply system according to the first embodiment.
Fig. 9 is a diagram for explaining the attachment of the power transmission coil and the housing in the modification of the first embodiment.
Fig. 10 is a front view showing the shape of a power transmission coil according to the second embodiment.
Fig. 11 is a view of the power transmission coil viewed from the direction of arrow J1 of fig. 10.
Fig. 12 is a schematic configuration diagram of a wireless power supply system of the third embodiment.
Fig. 13 is a layout diagram of a power transmission coil and a power reception coil according to the third embodiment.
Fig. 14 is (one of) a transmission coil modification example according to the third embodiment.
Fig. 15 is a diagram (two) showing a modification of the power transmission coil according to the third embodiment.
Fig. 16 is a diagram (iii) showing a modification of the power transmission coil according to the third embodiment.
Fig. 17 is a schematic configuration diagram of a wireless power feeding system according to a modification of the third embodiment.
Fig. 18 is a diagram showing shapes and arrangements of the power receiving coils 1A and 1B and the power transmission coil 2 in the wireless power transmission system according to the fourth embodiment.
Fig. 19 is a diagram showing shapes and arrangements of the power receiving coils 1A and 1B and the power transmission coil 2 in the wireless power transmission system according to the fifth embodiment.
Fig. 20 is a diagram showing the configuration of the control unit 202.
Fig. 21 is a diagram showing a modification of the control unit 202.
Fig. 22 is a diagram showing a modification of the control unit 202.
Detailed Description
Hereinafter, a specific embodiment will be described by taking a wireless power feeding system as an example. However, the technology of the present specification is not limited to these embodiments.
(first embodiment)
The present embodiment is an air conditioner equipped with a wireless power supply system.
1. Vehicle-mounted component
Fig. 1 is a schematic view showing an interior of a vehicle. As shown in fig. 1, a dashboard IP is provided on the front surface of the driver seat of the vehicle. The instrument panel IP is provided with a plurality of air conditioning registers CA 1. A wireless power supply system is incorporated in two adjacent air conditioning registers CA1 near the center. The air conditioner CA1 includes a housing 160 and a knob N1 for adjusting the direction of the air by the user. The knob N1 is capable of emitting light. This is because the user can easily grasp the position of the knob N1 even when the vehicle is dark.
2. Wireless power supply system
Fig. 2 is a schematic diagram showing a schematic configuration of the wireless power supply system 100 according to the first embodiment. The wireless power feeding system 100 performs wireless power feeding by a magnetic field coupling method or a magnetic field resonance method. As shown in fig. 2, the wireless power supply system 100 includes one power transmission coil 110, 2 power receiving coils 120, a power transmission circuit 130, a power receiving circuit 140, a light emitting device 150, and a housing 160. As shown in fig. 2, the power transmission coil 110 includes a connection portion 113 that connects two regions surrounded by the coil.
The resonant frequency of the wireless power supply system 100 is 6.78 MHz. Therefore, the frequency of the current flowing through the power transmission coil 110 and the power reception coil 120 is 6.78 MHz. The resonant frequency of the LC circuit of power transmission coil 110 is also 6.78 MHz. The resonant frequency of the LC circuit of the power receiving coil 120 is also 6.78 MHz. The frequency of the current flowing through the power transmission circuit 130 at the power transmission coil 110 is also 6.78 MHz. In practice, there are cases where the frequency deviates slightly from the desired frequency. Further, 6.78MHz is exemplified, but a resonance frequency of 500kHz to 15MHz may be adopted. Resonance frequencies other than those described above may be used.
The power transmission coil 110 is a coil for forming a magnetic field around the power receiving coil 120. The power transmission coil 110 is connected in series with a capacitor described later. The power transmission coil 110 is formed of a wire. Examples of the wire include single wire and twisted wire. The material of the power transmission coil 110 may be copper, for example. The power transmission coil 110 is formed in a shape surrounding two quadrangles. A more detailed shape of the power transmission coil 110 will be described later. Power transmission coil 110 is hollow. The number of turns of the power transmission coil 110 may be 1 to 3. Of course, not limited to this numerical range. In fig. 2, the number of turns of the power transmission coil 110 is 1.
The power receiving coil 120 is a coil that generates an electric current by a magnetic field formed by the power transmitting coil 110. The power receiving coil 120 is connected in series with a capacitor described later. The power receiving coil 120 is made of a wire rod. Examples of the wire include single wire and twisted wire. The power receiving coil 120 is made of copper, for example. In fig. 2, the power receiving coil 120 has a nearly quadrangular shape, but may have a spiral shape such as a spring.
The power transmission circuit 130 is a circuit for oscillating an ac voltage flowing through the power transmission coil 110. Power transmission circuit 130 generates an alternating current of 6.78 MHz.
The power receiving circuit 140 is a circuit for converting a current flowing through the power receiving coil 120 into a current suitable for the light emitting device 150. Specifically, the ac voltage of the power receiving coil 120 is converted into a dc voltage for driving the light emitting device 150. The power receiving circuit 140 may have other functions such as a rectifier circuit.
The light emitting device 150 is used for indicating that the user easily knows the position of the knob N1 even in a dark vehicle. The light emitting device 150 is an electronic component driven by power from the power receiving coil 120. The light emitting device 150 constitutes a part of a knob N1 of an air conditioner register. The light-emitting device 150 has a semiconductor light-emitting element. The light emitting device 150 emits light by a dc voltage. The light emitting device 150 is an electronic device and is an electronic component. The knob N1 is an operation unit for the user to operate. The user can adjust the wind direction of the air conditioner register CA1 by changing the position of the knob N1.
The housing 160 is a casing of the air conditioner CA 1. That is, the device surrounded by the casing 160 is the air conditioner CA 1. The frame 160 is made of, for example, plastic. The frame 160 is a housing of the device, and thus has a sufficiently thin thickness.
3. Power transmission coil
3-1, fixed state of power transmission coil and frame body
Fig. 3 is (one of) a diagram showing a state in which the power transmission coil 110 and the housing 160 are fixed to each other. As shown in fig. 3, a groove 161 is formed in the outer wall of the frame 160. The power transmission coil 110 is disposed in a groove 161 housed in the housing 160. Thus, the power transmission coil 110 is fixed to the frame 160.
Fig. 4 shows (two) the state of fixing the power transmission coil 110 to the housing 160. As shown in fig. 4, the power transmission coil 110 may be fixed to the frame 160. Fig. 5 is a partial sectional view showing a part of the V-V section of fig. 4. As shown in fig. 4, a claw 162 is formed on the outer wall of the frame 160. The power transmission coil 110 is positioned and fixed to the frame 160 by a plurality of claws 162. The claw 162 is a support member for fixing the power transmission coil 110.
As described above, other support members may be used as long as the power transmission coil 110 can be positioned and fixed relative to the housing 160. In addition, the frame 160 and the power transmission coil 110 may be in partial contact.
Further, the groove 161 or the support member of the frame body 160 does not completely cover the power transmission coil 110, and at least a part of the power transmission coil 110 is in contact with the atmosphere. That is, power transmission coil 110 is not sealed by a non-conductive material.
3-2. shape of Power Transmission coil
Fig. 6 is a diagram showing the shape of the power transmission coil 110. In fig. 6, the power transmission coil 110 has 1 turn. The surface surrounded by the power transmission coil 110 is a plane. That is, the power transmission coil 110 has a planar shape lying on one plane. The surface surrounded by the power transmission coil 110 is defined as an xy plane. A direction perpendicular to a plane surrounded by the power transmission coil 110 is defined as a z-axis.
The length of the power transmission coil 110 in the x-axis direction is, for example, 10mm to 400 mm. The thickness may be 80mm to 350 mm. The length of the power transmission coil 110 in the y-axis direction is, for example, 10mm to 400 mm. The thickness may be 50mm to 100 mm. The length of the power transmission coil 110 in the z-axis direction is, for example, 0.5mm to 10 mm. These numerical ranges are standard, but may be other than the above.
As shown in fig. 6, the power transmission coil 110 includes a first operating portion 111 (first region 111), a second operating portion 112 (second region 112), and a coupling portion 113. The first acting portion 111 is a portion surrounding the casing 160 of the first air conditioning register. The second operating portion 112 is a portion surrounding the housing 160 of the second air conditioning register. The connection portion 113 is a portion connecting the first acting portion 111 and the second acting portion 112.
The first acting portion 111 has four sides 111a, 111b, 111c, and 111 d. The four sides 111a, 111b, 111c, and 111d generate magnetic fields near the center of the first acting portion 111. Thus, since the four sides 111a, 111b, 111c, and 111d surround the frame 160, a relatively strong magnetic field is formed around the frame 160.
The second acting portion 112 has four sides 112a, 112b, 112c, 112 d. The four sides 112a, 112b, 112c, and 112d generate magnetic fields near the center of the second acting portion 112, respectively. Thus, since the four sides 112a, 112b, 112c, and 112d surround the frame 160, a relatively strong magnetic field is formed around the frame 160.
Thus, the power transmission coil 110 has four sides surrounding the frame 160.
The power transmission coil 110 of the present embodiment can form a stronger magnetic field than in the case where the sides 111d and 112d are very short or do not exist. Further, since the power transmission coil 110 has the side 111d and the side 112d, the power transmission coil 110 is easily fixed to the frame 160.
4. Power receiving coil
Fig. 7 is a perspective view showing a positional relationship between the power receiving coil 120 and the light emitting device 150. As shown in fig. 7, the knob N1 is an operation unit for adjusting the wind direction of the air conditioner for air conditioning. The knob N1 accommodates the power receiving coil 120, the power receiving circuit 140, and the light emitting device 150. The power receiving coil 120 has a spiral shape. The voltage and current from the power receiving coil 120 are input to the power receiving circuit 140. The power receiving circuit 140 converts an ac voltage into a dc voltage to drive the light emitting device 150.
The knob N1 is an operation unit and is disposed inside the housing 160 or on the surface of the housing 160. Therefore, the power receiving coil 120 is disposed inside the housing 160 or on the surface of the housing 160. The two power receiving coils 120 are disposed near the centers of the first and second operating parts 111 and 112 of the power transmission coil 110, and are surrounded by the first and second operating parts 111 and 112, respectively, on the four sides.
The power receiving coil 120 is wound in a stacked manner in the z-axis direction. That is, the coil is wound not so as to be housed in the same plane but so as to be stacked in the z-axis direction perpendicular to the plane surrounded by the coil.
The area of the surface surrounded by the power receiving coil 120 is sufficiently smaller than the area of the surface surrounded by the power transmission coil 110. The ratio of the area of the surface surrounded by the power receiving coil 120 to the area of the surface surrounded by the power transmission coil 110 is about 1/200 to 1/10. This is a standard only, and may be a value other than the above. The power transmission coil 110 and the power receiving coil 120 are not limited to those provided on the instrument panel IP, and their configurations can be grasped as independent inventions. In addition, a wireless power feeding system from the power transmission coil 110 to the power reception coil 120 can be independently recognized as an invention.
5. Circuit of wireless power supply system
Fig. 8 is a diagram schematically showing a circuit of the wireless power feeding system 100 according to the present embodiment. As shown in fig. 8, power transmission coil 110 forms an LC series circuit together with capacitor C1. The power receiving coil 120 and the capacitor C2 together form an LC series circuit. As described above, the resonance frequency of the LC series circuit on the power transmission coil 110 side and the resonance frequency of the LC series circuit on the power receiving coil 120 side are designed to be equal in circuit.
The power transmission output in the wireless power supply system 100 is 10W or less. For example 5W. The voltage for driving the light emitting device 150 is, for example, 5V. Of course, other values than those described above are also possible. The current flowing through the light emitting device 150 is 1mA or less. Of course, other values than those described above are also possible.
Further, in fig. 8, capacitor C1 is depicted as being located outside of power transmission circuit 130. Fig. 8 is a schematic diagram, and capacitor C1 may also be located within power transmission circuit 130. Similarly, the capacitor C2 may be located in the power receiving circuit 140.
The electromagnetic coupling relationship between the power transmission coil 110 and the power reception coil 120 used in the above embodiment can be recognized as being separate and independent from the device of the embodiment, and can be used as a power feeding mechanism for feeding power from the power transmission coil 110 to the power reception coil 120.
6. Effects of the present embodiment
Even in a position where it is difficult to connect a wiring, such as the knob N1 of the air conditioner CA1, the electronic component can be operated by wireless power supply.
In the design of a vehicle, a space for disposing the power transmission coil 110 and the like in the vehicle is limited. In the present embodiment, the power transmission coil 110 is fixed to the outer wall of the housing 160 of the air conditioner register CA 1. Further, since the power transmission coil 110 has a shape conforming to the outer shape of the housing 160, space can be saved, which is advantageous in design.
In addition, vibration is generally generated in the vehicle. Therefore, the position of the power transmission coil 110 to be fixed may be deviated. In the wireless power feeding system 100 according to the present embodiment, since the power transmission coil 110 is sufficiently fixed to the housing 160, there is little possibility of positional displacement of the power transmission coil 110 even if vibration is repeatedly generated in the vehicle. In addition, the power receiving power difference between the two power receiving coils 120 can be suppressed.
The power receiving coil 120 is preferably located in a plane surrounded by the power transmission coil 110, but may be displaced in the z-axis direction for the convenience of mounting the vehicle-mounted component. Since the wireless power feeding system 100 employs the magnetic field coupling type, power can be fed to the light emitting device 150 without any problem even if the z-axis displacement between the power transmission coil 110 and the power reception coil 120 is, for example, about several tens of cm.
7. Modification example
7-1. installation of Power Transmission coil
Fig. 9 is a diagram for explaining the attachment of the power transmission coil 110 and the housing 160 in the modification of the first embodiment. As shown in fig. 9, the power transmission coil 110 may be attached to a substantially cubic frame 160 in an inclined manner.
7-2. support part
The support member provided to the frame 160 may have other shapes or structures. For example, clips, spacers, and the like can be employed.
7-3. lamination direction of power transmission coil
When the power transmission coil 110 is wound into 2 or more turns, it is laminated in the z-axis direction in the same manner as the power receiving coil 120 of fig. 7. That is, the coil is wound so as to be stacked in a direction intersecting a surface surrounded by the coil.
7-4. wireless power supply mode
The wireless power feeding system 100 of the present embodiment is a magnetic field coupling system. However, the technique of the first embodiment can be applied to a wireless power supply system of an electromagnetic induction system. In addition, a magnetic resonance system can also be employed.
7-5. frame body
The housing 160 of the present embodiment is a casing of the air conditioner CA 1. However, the frame 160 may be a housing of another vehicle-mounted member. Further, the electric appliance may be other than the vehicle-mounted member. The material of the frame 160 may be glass, resin, ceramic, or other non-conductive material.
7-6. electronic component
The wireless power supply system 100 of the present embodiment includes a light-emitting device 150. The wireless power supply system 100 may also have other electronic devices or electronic components instead of the light-emitting device 150.
7-7. combination
The above modifications can be freely combined.
(second embodiment)
A second embodiment will be explained. In the second embodiment, the shape of the power transmission coil is different from that of the first embodiment. Therefore, the power transmission coil will be explained. The power transmission coil described below is also recognized as an independent invention of a power transmission coil used in a wireless power supply system that is not limited to the above-described application.
1. Three-dimensional shape of power transmission coil
Fig. 10 is a front view showing the shape of a power transmission coil 210 according to a second embodiment. As shown in fig. 10, the power transmission coil 210 includes a first region 211, a second region 212, and a connection portion 113. The first region 211 has four sides 111a, 111b, 211c, 111 d. The second region 212 has four sides 112a, 112b, 212c, 112 d.
Fig. 11 is a view of the power transmission coil 210 viewed from the direction of arrow J1 of fig. 10. As shown in fig. 11, the sides 211c and 212c of the transmission coil 210 protrude toward the power reception coil 120. Therefore, the sides 211c and 212c are bent toward the power receiving coil 120.
2. Effects of the present embodiment
As shown in fig. 11, the z-axis is set. In this case, a distance K1 (z-axis direction) between the protruding portion of the side 211c and the power receiving coil 120 is smaller than a distance K2 (z-axis direction) between the side 111a and the power receiving coil 120. As shown in fig. 11, since the distance K1 is sufficiently smaller than the distance K2, the side 211c can generate a stronger magnetic field at the position of the power receiving coil 120.
3. Modification example
3-1. number of protruding edges
In fig. 11, only the side 211c as 1 side out of the 4 sides of the first region 211 protrudes toward the power receiving coil 120. However, the number of sides protruding toward the power receiving coil 120 may be larger. The number of sides protruding toward the power receiving coil 120 is 1 to 4. That is, at least one of the four sides of the power transmission coil 110 protrudes toward the power receiving coil 120.
3-2. combination
The second embodiment and its modifications may be freely combined with the first embodiment and its modifications.
(third embodiment)
Fig. 12 is a diagram showing a configuration of a wireless power feeding system according to a third embodiment. As shown in fig. 12, the wireless power feeding system according to the third embodiment includes two power receiving coils 1A and 1B, one power transmission coil 2, an ac power supply 3 and a circuit 4 connected to the power transmission coil 2, and circuits 5A and 5B connected to the power receiving coils 1A and 1B, respectively. The present embodiment can be used for applications such as the air conditioner register of the first embodiment, but can be recognized as an independent invention as a wireless power supply system, a power transmission coil, and a power reception coil, which are not particularly limited to the applications.
The wireless power supply system according to the third embodiment is a system for transmitting power from one power transmission coil 2 to two power receiving coils 1A and 1B in a non-contact manner by magnetic field resonance. The output of the transmission power is, for example, 10W or less.
The ac power supply 3 is a power supply that supplies ac current to the power transmission coil 2. The frequency is, for example, 500kHz to 15 MHz. The circuit 4 is a circuit for setting a resonance frequency on the power transmission side, and is set to a predetermined frequency based on the capacitance of the capacitor and the inductance of the inductor. The circuits 5A and 5B are circuits for matching the resonance frequency on the power reception side with the resonance frequency on the power transmission side, and are set to a predetermined frequency according to the capacitance of the capacitor and the inductance of the inductor. A load not shown is connected to the circuits 5A and 5B. If the load is a DC-driven apparatus, the received power is converted into DC and supplied to the load. The load is, for example, a light emitting element.
The power receiving coils 1A and 1B and the power transmission coil 2 are made of wire materials. The wire material is any material as long as it is conductive, and for example, a twisted wire or a copper wire is used. Further, the wiring member may be formed by printing a pattern on a printed circuit board such as an FPC, without being limited to a wire.
Next, the shapes and the arrangements of the power receiving coils 1A and 1B and the power transmission coil 2 will be described with reference to fig. 13. Fig. 13 shows the shape of the coil 1 turn, and is a view seen from a direction perpendicular to a plane formed by the 1 turn of the power transmission coil 2. For simplicity of explanation, the coordinate system is determined as shown in fig. 13.
First, the power receiving coils 1A and 1B will be described. As shown in fig. 13, the power receiving coils 1A and 1B are arranged with a predetermined interval in the x-axis direction. The interval is arbitrary as long as it is within a range in which interference between the power receiving coil 1A and the power receiving coil 1B can be sufficiently reduced. The axial directions of the power receiving coils 1A and 1B are aligned in the z-axis direction, and the plane formed by the power receiving coils 1A and 1B is arranged on the same plane as the plane formed by the power transmission coil 2.
The power receiving coils 1A and 1B are circular coils formed by winding wire rods in a circular shape. The winding direction is the z-axis direction. Cylindrical ferrite cores 10A and 10B are inserted into the center portions of the power receiving coils 1A and 1B, respectively. The cross-sectional area of the power receiving coils 1A and 1B is 12mm2The number of turns was 4.5 turns, and the axial length of the coil (the length in the z-axis direction) was 6.5 mm. Further, the ferrite core 10A,10B have a diameter of 8mm and a length of 7 mm.
The sectional area and the number of turns of the power receiving coils 1A and 1B are not limited to those shown in the first embodiment, and may be set according to the received power, the received power efficiency, and the like. For example, when the transmitted power is 10W or less, the widths (coil diameters) of the power receiving coils 1A and 1B in the x-axis direction and the y-axis direction are preferably 3 to 200mm, and the axial length (length in the z-axis direction) of the coil is preferably 1 to 20 mm. The power receiving efficiency can be improved, and the power receiving difference can be further reduced.
The shape of the power receiving coils 1A and 1B is not limited to a circle, and may be a square, a rectangle, or the like. The power receiving coil 1A and the power receiving coil 1B may have different shapes. However, it is preferable that the power reception coils 1A and 1B have the same shape because the difference in power reception is easily controlled.
The power receiving coils 1A and 1B do not necessarily need a core material, and may be air-core coils. However, the cross-sectional area of the power receiving coils 1A and 1B is set to 20mm2In the following case, it is preferable to use a ferrite core in order to improve the power receiving efficiency.
The plane formed by the power receiving coils 1A and 1B is not necessarily the same plane as the plane formed by the power transmission coil 2, and may be a different plane parallel to the plane formed by the power transmission coil 2 or an angled plane as long as the range can receive power from the power transmission coil 2. The plane formed by the power receiving coil 1A and the plane formed by the power receiving coil 1B may be different planes parallel to each other or may form an angle.
The winding direction of the power receiving coils 1A and 1B may be either left-handed or right-handed, or the winding direction of the power receiving coils 1A and 1B may be changed.
Next, the power transmission coil 2 will be explained. The power transmission coil 2 is a wire material wound a plurality of times with the axial direction thereof in the z-axis direction, and is configured by two action portions 20A and 20B and a connection portion 21 connecting the action portion 20A and the action portion 20B for each turn, as shown in fig. 13, and has a gourd-shaped or spectacle-shaped overall shape. Each of the action portions 20A, 20B and the coupling portion 21 is clearly illustrated by being surrounded by a broken line in fig. 13. The number of turns of the power transmission coil 2 is set appropriately according to the power transmission, power transmission efficiency, and the like, and is, for example, 2 to 3 turns. The winding direction may be either left-handed or right-handed.
The action portion 20A is a portion mainly contributing to power transmission to the power receiving coil 1A, and the action portion 20B is a portion mainly contributing to power transmission to the power receiving coil 1B. The action portions 20A and 20B are portions of a wire rod having a rectangular cross-sectional shape, and are arranged at intervals in the x-axis direction. The surface formed by the action portion 20A is the same as the surface formed by the action portion 20B. The working portions 20A and 20B are arranged such that the sides thereof are aligned with the x-axis direction and the y-axis direction. The power receiving coil 1A is disposed at the center of the working portion 20A, and the power receiving coil 1B is disposed at the center of the working portion 20B. The width of the action portions 20A, 20B in the x-axis direction is 140mm, and the width in the y-axis direction is 90 mm.
In this way, the action portions 20A and 20B are arranged so as to surround the peripheries of the power receiving coils 1A and 1B. That is, the sides of the action portions 20A and 20B are located in the + x direction, the-x direction, the + y direction, and the-y direction at equal distances from the centers of the power receiving coils 1A and 1B, respectively. Therefore, the distribution of the magnetic field intensity generated from each side of the action portions 20A and 20B becomes uniform, and the difference in the electric power received by the power receiving coils 1A and 1B is small.
In order to further reduce the difference in power received by the power receiving coils 1A and 1B, the difference between the longest distance and the shortest distance from the center of the power receiving coils 1A and 1B to the working parts 20A and 20B may be 8 times or less the diameter of the working parts 20A and 20B (the diameter of the circumscribed circle of the working parts 20A and 20B).
The cross-sectional areas of the power receiving coils 1A and 1B are set to be 1/2 or less of the cross-sectional areas of the action portions 20A and 20B. By setting the cross-sectional areas of the power receiving coils 1A and 1B or the cross-sectional areas of the operating units 20A and 20B in this manner, the difference in power receiving power from the operating units 20A and 20B can be suppressed. More preferably, 1/50 or less of the cross-sectional area of the action portions 20A, 20B is used.
In the third embodiment, the planar patterns of the action portions 20A and 20B are formed in a rectangular shape, but may be any shape as long as the shape surrounds the four sides of the power receiving coils 1A and 1B, and the planar pattern of the action portion 20A and the planar pattern of the action portion 20B may be different in shape and size. For example, the plane pattern of the action portions 20A, 20B is square, rectangle, rhombus, circle, semicircle, ellipse, polygon, or the like. Fig. 14 shows an example in which the action portion 20A is circular and the action portion 20B is rectangular. The cross-sectional area of the coil may be changed in the action portion 20A and the action portion 20B. Fig. 15 shows an example in which the cross-sectional area of the action portion 20A is made larger than the cross-sectional area of the action portion 20B. When the power transmission coil 2 is wound around a housing, the shape may be matched with the shape of the housing.
In the third embodiment, the surface formed by the action part 20A and the surface formed by the action part 20B are made to be the same plane, but may be different parallel surfaces or may form an angle as long as the power transmission to the power receiving coils 1A and 1B is possible.
The power receiving coils 1A and 1B need not be at the centers of the action portions 20A and 20B, but are preferably as close as possible to the centers from the viewpoint of suppressing the difference in power receiving capability.
The connecting portion 21 is a portion connecting the working portion 20A and the working portion 20B, and is two linear wires extending in the x-axis direction. On the side where the action portion 20A and the action portion 20B face each other, one of the corner portions of the action portion 20A and the corner portion of the action portion 20B facing the one are connected by a connecting portion 21. Here, the connecting portion is arbitrary as long as it is not a branch of a wire but is connected so that the entirety of the action portions 20A, 20B and the connecting portion 21 becomes one stroke. One of the two straight lines of the connecting portion 21 is continuous with one side of the working portions 20A and 20B to form one straight line.
The position of the coupling portion 21 is not limited to the position shown in the third embodiment, and may be coupled to the action portions 20A and 20B at any position. For example, as shown in fig. 16, the working portions 20A and 20B may be connected to the center of the opposing sides. However, the position shown in the third embodiment can reduce the number of positions for bending the wire material, and the space area between the action portions 20A and 20B can be enlarged without being cut off, so that the power transmission coil 2 can be more easily mounted. Moreover, since the corners of the action portions 20A and 20B are located at a distance from the power receiving coils 1A and 1B, the power receiving efficiency is improved.
In the third embodiment, the connecting portion 21 has a shape in which two wires are arranged in parallel and linearly, but the interval and shape of the two wires may be arbitrary or may be curved. In addition, the two wires may be in contact with each other or twisted together. The length of the coupling portion 21 may be arbitrary.
The shape and size of the entire power transmission coil 2 are not particularly limited, but when the power transmission is 10W or less, the widths (coil diameters) in the x-axis direction and the y-axis direction are preferably 10 to 400mm, and the axial length (z-axis length) of the coil is preferably 1 to 100 mm. The power receiving efficiency can be improved, and the power receiving difference can be further reduced. In this case, the shapes and sizes of the action portions 20A and 20B and the coupling portion 21 may be any as long as they fall within the above-described ranges as a whole.
In the third embodiment, the two wires connected to the circuit 4 are drawn out from the working portion 20A, but the drawing positions may be arbitrary, or may be drawn out from the connecting portion 21.
As described above, in the wireless power feeding system according to the third embodiment, since the power transmission coils are arranged so as to surround the four sides of the power receiving coils 1A and 1B, the difference in power receiving power in the power receiving coils 1A and 1B can be suppressed.
Further, the wireless power feeding system according to the third embodiment transmits power to two power receiving coils, but the third embodiment can also be applied to a system that transmits power to three or more power receiving coils. Fig. 17 shows an example in which 3 power receiving coils are provided. As shown in fig. 17, the power transmission coil 30 includes action portions 30A, 30B, and 30C, the action portion 30A and the action portion 30B are connected by a connection portion 31A, and the action portion 30B and the action portion 30C are connected by a connection portion 32B. The power receiving coils 1A, 1B, and 1C are disposed at the centers of the action portions 30A, 30B, and 30C. Thereby, the power receiving coils 1A, 1B, and 1C are surrounded on the four sides by the working sections 30A, 30B, and 30C.
The wireless power feeding system according to the third embodiment is suitable for suppressing the difference in the power receiving powers of the two power receiving coils, but can also be used for adjusting the difference in the power receiving powers to a desired value.
(fourth embodiment)
The present embodiment is an example in which the interval of the coupling portion 21 of fig. 13 is adjusted in the third embodiment. As shown in fig. 18, the connecting portion 21 is a portion connecting the working portion 20A and the working portion 20B, and is two linear wires 21a and 21B extending in the x-axis direction. On the side where the action portion 20A and the action portion 20B face each other, one of the corner portions of the action portion 20A and the corner portion of the action portion 20B facing the one are connected by a connecting portion 21. Here, the connecting portion is arbitrary as long as it is not a branch of a wire but is connected so that the entirety of the action portions 20A, 20B and the connecting portion 21 becomes one stroke. One of the two straight lines (the wire 21B) of the connecting portion 21 is continuous with one side of the working portions 20A and 20B to form one straight line.
The connecting portion 21 is provided with a control portion 22 for fixing the interval between the two wires 21a and 21b constituting the connecting portion 21 so as not to vary from a predetermined distance. The control portion 22 is a rectangular spacer having a short side equal to the interval between the two wires and a long side equal to the length (width in the x-axis direction) of the connection portion 21. The control unit 22 may be any member (a non-conductive material with a low dielectric constant) that does not affect the characteristics of the power transmission coil 2. For example, a foamable resin can be used. When the power transmission coil 2 has 2 turns or more, the connection portions 12 of the turns may be collectively fixed by one spacer.
Since the power transmission coil 2 in the wireless power feeding system of the present embodiment is formed of a wire material, the inductance of the coil changes due to deformation or displacement of the power transmission coil 2. In particular, the two wires 21a and 21b of the coupling portion 21 of the power transmission coil 2 are close to each other, and the coupling portion 21 generates a parasitic capacitance in the power transmission coil 2, thereby greatly affecting the inductance of the coil. Therefore, in the power transmission coil 2 of the present embodiment, the parasitic capacitance is not varied by fixing the interval between the two wires 21a and 21b constituting the connection portion 21 by the control portion 22. In addition, this suppresses variation in the inductance of the coil, and power transmission efficiency does not decrease.
The controller 22 may fix the interval between the two wires to a predetermined distance by a method other than the spacer. For example, a groove or a protrusion may be provided in the housing around which the wire is wound, and the wire may be fitted into the groove or the protrusion to fix the wire. The two wires 21a and 21b may be fixed to the frame by an adhesive or an adhesive tape, or may be fixed to each other by an adhesive tape or an adhesive. If the wires are covered with an insulating material, the interval between the two wires 21a and 21b may be fixed to 0. When the interval is set to 0, the two wires 21a and 21b may be twisted into a double helix.
The interval between the two wire materials 21a and 21b of the connection section 21 may be any interval as long as it is sufficiently smaller than the diameter of the power transmission coil 2 (the diameter of the circle inscribed in the whole power transmission coil 2), and for example, may be equal to or smaller than 1/10 of the diameter of the power transmission coil 2. In example 1, the thickness is preferably fixed to 0 to 15 mm.
The shape and size of the entire power transmission coil 2 are not particularly limited, but when the power transmission is 10W or less, the widths (coil diameters) in the x-axis direction and the y-axis direction are preferably 10 to 400mm, and the axial length (z-axis length) of the coil is preferably 1 to 100 mm. The power receiving efficiency can be improved, and the power receiving difference can be further reduced. In this case, the shapes and sizes of the action portions 20A and 20B and the coupling portion 21 may be any as long as they fall within the above-described ranges as a whole.
In the present embodiment, the two wires connected to the circuit 4 are drawn out from the working portion 20A, but the drawing positions may be arbitrary, or may be drawn out from the connecting portion 21.
As described above, in the wireless power feeding system according to the present embodiment, the control unit 22 for fixing the interval between the two wire materials 21a and 21b of the connection unit 21 is provided in the connection unit 21 of the power transmission coil 2, and the parasitic capacitance of the power transmission coil 2 is not varied by the control unit 22. Therefore, even if variations in the shape, arrangement, and the like of the power transmission coil 2 occur, variations in the inductance of the coil can be suppressed, and a decrease in power transmission efficiency can be suppressed.
(fifth embodiment)
Fig. 19 is a diagram showing shapes and arrangements of the power receiving coils 1A and 1B and the power transmission coil 2 in the wireless power feeding system according to the fourth embodiment. As shown in fig. 19, the wireless power feeding system replaces the control unit 22 provided in the connection unit 21 (fig. 18) of the power transmission coil 2 with the control unit 202 described below. The other structure is the same as that of the fourth embodiment.
The control unit 202 is a device for varying the interval between the two wires constituting the connection unit 21. The control unit 202 may be any member as long as it does not affect the characteristics of the power transmission coil 2. As shown in fig. 20, the control portion 202 includes two protrusions 203A and 203B and a gear 204.
The projections 203A and 203B are elongated rectangular shapes. One end of the projection 203A is fixed to one (21 a) of the two wires constituting the coupling portion 21, and the other end of the projection 203A protrudes toward the other wire (21 b). One end of the projection 203B is fixed to the wire 21B, and the other end of the projection 203B protrudes toward the wire 21 a. The projections 203A and 203B are arranged with a constant interval. Further, serrations 205 are provided on the opposite sides of the protrusions 203A and 203B.
The gear 204 is disposed in a space portion where the projection 203A and the projection 203B face each other, and is disposed such that teeth of the gear 204 mesh with teeth of the projections 203A and 203B.
In the control unit 202, the gear 204 is rotated, and the projections 203A and 203B engaged therewith are moved in a direction away from each other or in a direction approaching each other. Accordingly, the wires 21a and 21B connected to the protrusions 203A and 203B are also pulled in a direction away from or toward each other. As a result, the interval between the wires 21a and 21b can be controlled.
The control unit 202 is not limited to the above-described mechanism, and may be any mechanism as long as it can change the interval between the two wires 21a and 21 b. In addition, the interval need not be variable over the entire area of the two wires 21a, 21b, and only a part of the interval may be variable.
For example, as shown in fig. 21, a link mechanism may be provided. The link mechanism is formed by connecting 3 rod-shaped bodies 210A, 210B, 210C in series with end portions thereof rotatable. One end of the rod-like body 210A is rotatably connected to the wire 21a, and the other end of the rod-like body 210A is rotatably connected to one end of the rod-like body 210B. One end of the rod-shaped body 210C is rotatably connected to the wire 21B, and the other end of the rod-shaped body 210C is rotatably connected to the other end of the rod-shaped body 210B.
A rotation shaft 211 is connected to the center of the rod 210B. By rotating the rotary shaft 211, the link mechanism is operated, and the interval between the wires 21a and 21b can be controlled.
As shown in fig. 22 (a), the conical screws 220A and 220B may be provided. The conical screws 220A and 220B are conical rotating bodies, and their conical axes are arranged perpendicular to the plane formed by the wires 21a and 21B. Further, by rotating the conical screws 220A, 220B, the conical screws 220A, 220B can move in the axial direction thereof. In addition, the conical screw 220A is in contact with the wire 21a on the side opposite to the wires 21a and 21B, and the conical screw 220B is in contact with the wire 21B on the side opposite to the wires 21a and 21B.
As shown in fig. 22 (B) and 22 (c), when the conical screws 220A and 220B are rotated, the diameters of the cross sections of the conical screws 220A and 220B in the plane formed by the wires 21a and 21B change, and when the diameters increase, the wires 21a and 21B in contact with the conical screws 220A and 220B are pulled toward the sides facing each other by the conical screws 220A and 220B. Thus, the interval between the wires 21a and 21b can be controlled.
As described above, in the wireless power feeding system according to the fifth embodiment, the connection part 21 of the power transmission coil 2 is provided with the control part 202 for varying the interval between the two wire members of the connection part 21, and the parasitic capacitance of the power transmission coil 2 can be adjusted by the control part 202. Therefore, even if the inductance of the coil is varied due to variations in the shape and arrangement of the power transmission coil 2, the inductance can be adjusted, and variations in the resonance frequency of the power transmission side circuit can be corrected. This also enables the transmission efficiency to be varied as intended.
(modification example)
The fourth and fifth embodiments provide a control unit for fixing and varying the parasitic capacitance at the connection portion 21 of the two action portions 20A and 20B of the power transmission coil 2, but any configuration may be used as long as the power transmission coil 2 has an approach portion where two wires approach each other, and the control unit is provided at the approach portion. Here, the approach portion is a region where the two wires are sufficiently close to each other, and is a region close to 1/10 or less of the diameter of the power transmission coil. Nor does it require that the two wires be parallel. In addition, when a plurality of proximity portions are provided, the control portions may be provided separately.
In the fourth and fifth embodiments, the control unit is provided on the side of the power transmission coil 2 to fix or adjust the parasitic capacitance generated in the proximity unit (the connection unit 21), but the parasitic capacitances of the power receiving coils 1A and 1B may be fixed or adjusted by providing the same configuration on the side of the power receiving coils 1A and 1B. Of course, the parasitic capacitance may be fixed and adjusted for both the power transmission coil 2 and the power reception coils 1A and 1B.
Industrial applicability of the invention
The power transmission coil, the power receiving coil, and the wireless power feeding system according to the present invention can be used for wireless power feeding to various electrical devices.
Description of the reference numerals
1A, 1B … power receiving coil; 2 … power transmission coil; 3 … a.c. power supply; 4. 5A, 5B … circuits; 20A, 20B … action parts; 21 … connecting part; 22. 202 … control section; 100 … wireless power supply system; 110 … power transmission coil; 120 … power receiving coil; 130 … power delivery circuit; 140 … power receiving circuit; 150 … light emitting device; 160 … frame body.
Claims (21)
1. A wireless power supply system comprising: an air-core power transmission coil, a power receiving coil, a device surrounded by a frame, and an electronic component driven by power from the power receiving coil,
the frame has a groove or support member in its outer wall,
the power transmission coil is fixed to the groove of the frame or the support member,
the power receiving coil is disposed inside the housing or on a surface of the housing.
2. The wireless power supply system according to claim 1,
the power transmission coil has four sides surrounding the frame body, and at least one of the four sides of the power transmission coil protrudes toward the power receiving coil.
3. The wireless power supply system according to claim 1 or 2,
the electronic component is a light-emitting device,
the device enclosed by the housing has an operation section for operating the device enclosed by the housing,
the operation unit includes the power receiving coil and the light emitting device.
4. The wireless power supply system according to any one of claims 1 to 3,
the power transmission coil is a wire.
5. The wireless power supply system according to any one of claims 1 to 4,
the current flowing through the electronic component is 1mA or less.
6. The wireless power supply system according to any one of claims 1 to 5,
the power transmission coil and the power receiving coil are in a magnetic field coupling type.
7. The wireless power supply system according to any one of claims 1 to 6,
the frame body is a frame body of an air conditioner air register.
8. The wireless power supply system according to any one of claims 1 to 7,
the slot or the support member of the frame does not completely cover the power transmission coil, at least a portion of which is in contact with the atmosphere.
9. A wireless power supply system which transmits power from a power transmission coil to a plurality of power reception coils in a non-contact manner by magnetic field resonance,
the wireless power supply system is characterized in that,
the structure of each unit winding of the power transmission coil is a structure having an action part arranged so as to surround the periphery of each power receiving coil and a connection part for connecting the action parts,
the cross-sectional area of each power receiving coil is 1/2 or less of the cross-sectional area of the action portion surrounding the power receiving coil.
10. The wireless power supply system according to claim 9,
the difference between the longest distance and the shortest distance from the center of each power receiving coil to the action portion surrounding the power receiving coil is 8 times or less the diameter of the action portion.
11. The wireless power supply system according to claim 9 or 10,
the power transmission power is less than 10W, the diameter of the power receiving coil is 3-200 mm, and the axial length of the power receiving coil is 1-20 mm.
12. The wireless power supply system according to any one of claims 9 to 11,
the transmission power is less than 10W, the diameter of the transmission coil is 10-400 mm, and the axial length of the transmission coil is 1-100 mm.
13. A power transmission coil is characterized in that,
in a power transmission coil composed of a wire rod for transmitting electric power in a non-contact manner by magnetic field resonance,
the distance control device comprises an approaching part and a control part, wherein the approaching part is provided with a distance that the two wire rods approach to 1/10 or less of the diameter of the power transmission coil, and the control part is used for controlling the distance between the two wire rods in the approaching part to be a preset distance.
14. A power transmission coil according to claim 13,
the control unit fixes the interval between the two wires to a predetermined distance.
15. A power transmission coil according to claim 13,
the control unit may vary the interval between the two wires.
16. A power receiving coil is characterized in that,
in a power receiving coil composed of a wire rod that receives electric power in a non-contact manner by magnetic field resonance,
an approaching section having a distance of 1/10 or less of the diameter of the power receiving coil at which the two wires approach, and a control section for controlling the distance between the two wires in the approaching section to a predetermined distance.
17. The power receiving coil according to claim 16,
the control unit fixes the interval between the two wires to a predetermined distance.
18. The power transmission coil of claim 16,
the control unit may vary the interval between the two wires.
19. A wireless power supply system is characterized in that,
the power transmission coil according to any one of claims 13 to 15, which transmits power in a non-contact manner by magnetic field resonance, and the power receiving coil which receives power in a non-contact manner from the power transmission coil.
20. A wireless power supply system is characterized in that,
the power receiving coil according to any one of claims 4 to 6, which includes a power transmission coil for transmitting power in a non-contact manner by magnetic field resonance and a power receiving coil for receiving power in a non-contact manner from the power transmission coil.
21. A wireless power supply system is characterized in that,
the power receiving coil of any one of claims 16 to 18, which includes a power transmission coil of any one of claims 13 to 15 for transmitting power in a non-contact manner by magnetic field resonance and a power receiving coil for receiving power in a non-contact manner from the power transmission coil.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-192971 | 2018-10-11 | ||
| JP2018-192941 | 2018-10-11 | ||
| JP2018192971A JP2020061888A (en) | 2018-10-11 | 2018-10-11 | Wireless power supply system |
| JP2018192941A JP7131282B2 (en) | 2018-10-11 | 2018-10-11 | Wireless power supply system |
| JP2018208857A JP7043012B2 (en) | 2018-11-06 | 2018-11-06 | Transmission coil, power receiving coil, and wireless power supply system |
| JP2018-208857 | 2018-11-06 | ||
| PCT/JP2019/038705 WO2020075572A1 (en) | 2018-10-11 | 2019-10-01 | Power transmission coil, power reception coil, and wireless power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112840523A true CN112840523A (en) | 2021-05-25 |
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ID=70164925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980066377.8A Pending CN112840523A (en) | 2018-10-11 | 2019-10-01 | Power transmission coil, power receiving coil, and wireless power supply system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112840523A (en) |
| WO (1) | WO2020075572A1 (en) |
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| JP2001287540A (en) * | 2000-04-06 | 2001-10-16 | Denso Corp | Blowoff grille structure of vehicular air conditioner |
| JP2011086890A (en) * | 2009-10-19 | 2011-04-28 | Tdk Corp | Wireless power feeding device, wireless power reception device and wireless power transmission system |
| CN102684318A (en) * | 2011-03-07 | 2012-09-19 | 日立麦克赛尔能源株式会社 | Non-contact power transmission device utilizing magnetic resonance |
| JP2014143836A (en) * | 2013-01-24 | 2014-08-07 | Panasonic Corp | Non-contact power transmission system |
| CN104756357A (en) * | 2012-03-20 | 2015-07-01 | 奥克兰联合服务有限公司 | Winding arrangements in wireless power transfer systems |
| JP2016002921A (en) * | 2014-06-18 | 2016-01-12 | 豊田合成株式会社 | Air conditioner for vehicle |
| CN108574327A (en) * | 2017-03-09 | 2018-09-25 | Tdk株式会社 | Coil unit, wireless power supply, wireless receiving device and Wireless power transmission system |
| CN108621964A (en) * | 2017-03-22 | 2018-10-09 | 丰田合成株式会社 | Armrest box |
-
2019
- 2019-10-01 WO PCT/JP2019/038705 patent/WO2020075572A1/en active Application Filing
- 2019-10-01 CN CN201980066377.8A patent/CN112840523A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001287540A (en) * | 2000-04-06 | 2001-10-16 | Denso Corp | Blowoff grille structure of vehicular air conditioner |
| JP2011086890A (en) * | 2009-10-19 | 2011-04-28 | Tdk Corp | Wireless power feeding device, wireless power reception device and wireless power transmission system |
| CN102684318A (en) * | 2011-03-07 | 2012-09-19 | 日立麦克赛尔能源株式会社 | Non-contact power transmission device utilizing magnetic resonance |
| CN104756357A (en) * | 2012-03-20 | 2015-07-01 | 奥克兰联合服务有限公司 | Winding arrangements in wireless power transfer systems |
| JP2014143836A (en) * | 2013-01-24 | 2014-08-07 | Panasonic Corp | Non-contact power transmission system |
| JP2016002921A (en) * | 2014-06-18 | 2016-01-12 | 豊田合成株式会社 | Air conditioner for vehicle |
| CN108574327A (en) * | 2017-03-09 | 2018-09-25 | Tdk株式会社 | Coil unit, wireless power supply, wireless receiving device and Wireless power transmission system |
| CN108621964A (en) * | 2017-03-22 | 2018-10-09 | 丰田合成株式会社 | Armrest box |
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| Publication number | Publication date |
|---|---|
| WO2020075572A1 (en) | 2020-04-16 |
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