CN113302815A - Non-contact power supply system - Google Patents
Non-contact power supply system Download PDFInfo
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- CN113302815A CN113302815A CN201980088725.1A CN201980088725A CN113302815A CN 113302815 A CN113302815 A CN 113302815A CN 201980088725 A CN201980088725 A CN 201980088725A CN 113302815 A CN113302815 A CN 113302815A
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- 238000005452 bending Methods 0.000 claims 1
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- 238000009434 installation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
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- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 2
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- 229910000889 permalloy Inorganic materials 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
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- 229910000702 sendust Inorganic materials 0.000 description 2
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
Abstract
A non-contact power supply system supplies power from a power transmission device to a power reception device in a non-contact manner, the power transmission device including: a power transmission coil (12); which is connected to a high-frequency power source (40) and generates magnetic flux; and an amplification coil (13) that amplifies the magnetic flux generated in the power transmission coil (12), wherein the power receiving device has a power receiving coil (32) that is electromagnetically coupled to the amplification coil (13).
Description
Technical Field
The present invention relates to a non-contact power supply system.
Background
JP2012-50209a discloses a non-contact power supply system including a power transmitting device having a power transmitting coil and a power receiving device having a power receiving coil. In the power receiving device of the non-contact power supply system, a magnetic flux collecting coil is provided to collect magnetic flux generated in the power transmitting coil and deliver the collected magnetic flux to the power receiving coil.
Disclosure of Invention
In the non-contact power supply system described in japanese patent application laid-open No. JP2012-50209a, when power is supplied from one power transmission device to a plurality of power reception devices, magnetic flux generated in a power transmission coil of the power transmission device is distributed to a power reception coil of each power reception device via a magnetic flux collection coil provided in each power reception device. Therefore, when the number of power receiving devices changes, the power distributed to each power receiving device also changes. As a result, it may be difficult to stably secure required power in each power receiving device.
The purpose of the present invention is to stably ensure power required by a power receiving device in a non-contact power supply system.
According to one aspect of the present invention, a contactless power supply system supplies power from a power transmitting device to a power receiving device in a contactless manner, the power transmitting device including: a power transmission coil connected to a power source and generating a magnetic flux; and an amplification coil that amplifies magnetic flux generated in the power transmission coil, and the power reception device includes a power reception coil electromagnetically coupled to the amplification coil.
Drawings
Fig. 1 is a plan view showing a configuration of a non-contact power supply system according to an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion indicated by an arrow II in fig. 1.
Fig. 3 is a side view of the power transmitting device shown in fig. 2.
Fig. 4 is a bottom view of the power transmitting device shown in fig. 2.
Fig. 5 is an electrical circuit diagram showing an electrical circuit of the non-contact power supply system according to the embodiment of the present invention.
Fig. 6 is a diagram showing a modification of the power transmitting apparatus shown in fig. 2.
Fig. 7 is an electrical circuit diagram showing a modification of the electrical circuit of the non-contact power supply system according to the embodiment of the present invention.
Fig. 8 is a plan view showing a configuration of a modification of the non-contact power supply system according to the embodiment of the present invention.
Detailed Description
Hereinafter, a non-contact power supply system according to an embodiment of the present invention will be described with reference to the drawings.
A non-contact power supply system is a device that supplies power in a non-contact manner from a power transmission coil provided in a power transmission device to a power reception coil provided in a power reception device. Hereinafter, a case where the non-contact power supply system is applied to the self-propelled conveying system 100 will be described with reference to fig. 1 to 5. Fig. 1 is a plan view showing the configuration of the self-propelled conveying system 100, fig. 2 is an enlarged view of a portion indicated by an arrow II in fig. 1, fig. 3 is a side view of a conveying path 10 described later in fig. 2, fig. 4 is a bottom view of the conveying path 10 shown in fig. 2, and fig. 5 is an electrical circuit diagram showing an electrical circuit of the self-propelled conveying system 100.
As shown in fig. 1, the self-propelled transport system 100 includes: a conveyance path 10 as a power transmission device; a plurality of transport vehicles 30 as power receiving devices that self-travel by electric power supplied from the transport path 10; a high-frequency power supply 40 as a power supply for supplying high-frequency power to the transmission line 10.
The self-propelled conveying system 100 includes a plurality of work tables 50 to 53 arranged around the conveying path 10 and performing work on a workpiece, not shown, conveyed by the conveyor car 30. In the self-propelled conveying system 100, the conveying vehicle 30 sequentially moves to the work tables 50 to 50 along the conveying path 10, and therefore, the work of loading, processing, assembling, and unloading the workpiece is performed in the work tables 50 to 53.
The conveyance path 10 is configured by coupling a plurality of conveyance path units 11 as power transmission units. Fig. 1 shows a conveyance path 10 configured in an oblong shape by combining a plurality of conveyance path units 11 having a linear or arc-shaped conveyance path. In the present embodiment, as shown in fig. 1, the conveyance path 10 is configured by combining four conveyance path units 11 having a straight conveyance path and four conveyance path units 11 having an arc-shaped conveyance path. The shape of the conveyance path 10 is not limited to this, and the conveyance path units 11 may be appropriately combined to form a more complex shape. Further, the conveyance path unit 11 having a slope-shaped conveyance path may be disposed to provide a level difference.
As shown in fig. 2 to 4, the conveyance path unit 11 includes: a power transmission coil 12 disposed along the conveyance path unit 11; an amplification coil 13 disposed inside the power transmission coil 12 in the width direction of the transmission path unit 11; a coil setting plate 20 on which the power transmission coil 12 and the amplification coil 13 are set; and a travel board 21 that is provided so as to cover the power transmission coil 12 and the amplification coil 13, and on which the conveyance vehicle 30 travels on the upper surface.
The power transmission coil 12 is formed by winding a single wire or litz wire (litz wire) in a round shape. The power transmitting coil 12 is connected to the high-frequency power source 40, and generates a magnetic flux corresponding to the current supplied from the high-frequency power source 40.
The power transmission coil 12 includes: a parallel portion 12a formed by a pair of linear portions; arc portions 12b as connection portions provided at both end portions of the parallel portion 12 a; and a bent portion 12c provided between the parallel portion 12a and the arc portion 12b, wherein the power transmission coil 12 is bent along the coil installation plate 20 in the bent portion 12 c.
Specifically, as shown in fig. 3 and 4, the arc portion 12b of the power transmission coil 12 is bent downward of the conveyance path unit 11 in a direction away from the travel board 21, i.e., in a direction away from the conveyance vehicle 30. Therefore, only the parallel portion 12a of the power transmission coil 12 faces the transport vehicle 30 via the travel plate 21. Although the arc portion 12b shown in fig. 3 is bent until it is substantially parallel to the parallel portion 12a, the arc portion 12b may be bent so that the angle with the parallel portion 12a is less than 90 °. The shape of the coupling portion is not limited to the circular arc shape, and may be a shape having an angle.
The amplification coil 13 is a coil formed by winding a single wire or a litz wire in a long circle, similarly to the power transmission coil 12. The amplification coil 13 is wound several times, for example, 2 to 4 times, as compared with the power transmission coil 12, and has a cross section having a width larger than that of the power transmission coil 12. The amplification coil 13 amplifies the magnetic flux generated in the power transmission coil 12, and is provided to transmit electric power to the plurality of conveyance vehicles 30.
The amplification coil 13 includes, similarly to the power transmission coil 12: a parallel portion 13a formed by a pair of linear portions; arc portions 13b as connection portions provided at both end portions of the parallel portion 13 a; and a bent portion 13c provided between the parallel portion 13a and the arc portion 13b, wherein the amplification coil 13 is bent along the coil installation plate 20 in the bent portion 13 c.
Specifically, as shown in fig. 3 and 4, the arc portion 13b of the enlarged coil 13 is bent downward of the conveyance path unit 11 in a direction away from the travel plate 21, that is, in a direction away from the conveyance vehicle 30, similarly to the power transmission coil 12. Therefore, only the parallel portion 13a of the amplification coil 13 faces the transport vehicle 30 via the travel plate 21. The arc portion 13b shown in fig. 3 is bent until it is substantially parallel to the parallel portion 13a, but the arc portion 13b may be bent so that the angle with the parallel portion 13a is less than 90 °. The shape of the coupling portion is not limited to the circular arc shape, and may be a shape having an angle.
The power transmission coil 12 and the amplification coil 13 having the above-described shapes are provided on the conveyance path unit 11 such that the parallel portion 12a of the power transmission coil 12 and the parallel portion 13a of the amplification coil 13 are arranged on the coil installation plate 20 on substantially the same plane. By disposing the power transmission coil 12 and the amplification coil 13 on the same plane in this manner, the magnetic flux generated in the power transmission coil 12 can be efficiently amplified by the amplification coil 13.
The coil installation plate 20 is a plate-like member made of a soft magnetic material such as amorphous alloy, permalloy, silicon steel, sendust, or soft magnetic ferrite, and cuts off the passage of the magnetic flux generated in the power transmission coil 12 and the magnetic flux amplified in the amplification coil 13 to the lower side. The coil installation plate 20 has a plurality of support columns, not shown, extending downward from the lower surface of the coil installation plate 20, and is installed at a predetermined position by the support columns.
The travel plate 21 is a plate-like member made of a non-magnetic material such as resin that allows the magnetic flux amplified by the amplification coil 13 to pass through the transport vehicle 30. Further, a pair of guide rails, not shown, are provided on the travel board 21 along the longitudinal direction in order to prevent the transport vehicle 30 from falling off the travel board 21.
As shown in fig. 2 to 4, the conveyance path unit 11 having the above-described configuration is disposed in proximity such that the bent portions 12c and 13c of the power transmission coil 12 and the amplification coil 13 face each other.
Since the adjacent conveying path units 11 are arranged close to each other, for example, the magnetic flux generated in the arc portion 12b of the one power transmission coil 12 and the magnetic flux amplified in the arc portion 13b of the amplification coil 13, and the magnetic flux generated in the arc portion 12b of the other power transmission coil 12 and the magnetic flux amplified in the arc portion 13b of the amplification coil 13 may affect each other. Therefore, the shielding plate 22 is provided between one of the arcuate portions 12b, 13b and the other arcuate portion 12b, 13b of the two conveyance path units 11 arranged adjacently.
The shield plate 22 is a plate-like member formed of a soft magnetic material such as amorphous alloy, permalloy, silicon steel, sendust, or soft magnetic ferrite. By providing the shielding plate 22 made of the soft magnetic material between one of the arc portions 12b and 13b and the other of the arc portions 12b and 13b, the shielding plate 22 cuts off the magnetic fluxes flowing toward each other. Therefore, even if the conveyance path units 11 configured as described above are disposed adjacent to each other, stable magnetic flux can be generated in each conveyance path unit 11. Although other metal materials having magnetism may be used as the shielding plate 22, it is preferable to use a soft magnetic material in order to avoid heat generation caused by the passage of magnetic flux.
Further, the arc portions 12b and 13b of the power transmission coil 12 and the amplification coil 13 are configured to be bent so as to be away from the transport vehicle 30, so that the arc portions 12b and 13b do not face the transport vehicle 30, and only the parallel portions 12a and 13a face the transport vehicle 30. In this way, by configuring to supply electric power to the transport vehicle 30 only in the parallel portions 12a and 13a in which the supplied electric power is relatively stable so as to avoid the arc portions 12b and 13b in which the supplied electric power is unstable, it is possible to stably supply electric power to the transport vehicle 30.
When the two conveyance path units 11 are disposed close to each other so that the bent portions 12c, 13c of the power transmission coil 12 and the amplification coil 13 face each other, the parallel portions 12a, 13a of the power transmission coil 12 and the amplification coil 13 of each conveyance path unit 11 are configured so as to be connected to each other. With this configuration, power can be continuously and stably supplied to the transport vehicle 30 moving from one transport path unit 11 to the other transport path unit 11. Further, even if the transport vehicle 30 stops at the boundary between the two transport path units 11, electric power is supplied from the two transport path units 11 to the transport vehicle 30, and therefore, electric power can be stably supplied to the transport vehicle 30.
The transport vehicle 30 is a traveling body including wheels for traveling, not shown, in contact with the traveling plate 21, an electric motor, not shown, for driving the wheels, and a power receiving coil 32 electromagnetically coupled to the amplifying coil 13.
The power receiving coil 32 is a coil formed by winding a single wire or a litz wire in an annular shape, and is provided on the bottom surface of the conveyance vehicle 30 so as to face the amplification coil 13. In the power receiving coil 32, electromagnetic induction is generated by the magnetic flux amplified in the opposite amplifying coil 13. The electromotive force generated by the electromagnetic induction in the power receiving coil 32 is supplied to the electric motor via a rectifier circuit or the like, not shown.
The transport vehicle 30 further includes a controller, not shown, that controls driving of the electric motor. The controller controls the driving of the electric motor in accordance with, for example, an external wireless command, and causes the transport vehicle 30 to travel at a predetermined speed or stop at a predetermined position.
The electric power consumed by electronic devices such as an electric motor and a controller provided in the transport vehicle 30 is always supplied from the power transmission coil 12 to the power reception coil 32 via the amplification coil 13. Therefore, it is not necessary to provide a power storage device such as a battery to the transport vehicle 30, and therefore, the transport vehicle 30 can be reduced in weight, and the manufacturing cost of the self-propelled transport system 100 can be reduced. Further, a relatively small battery in which electric power necessary for starting the controller or the like is stored may be mounted.
Next, an electric circuit of the self-propelled conveying system 100 configured as described above will be described with reference to fig. 5.
A power transmission coil 12 and an amplification coil 13 are provided for each transmission path unit 11 on the transmission path 10 as a power transmission device. The power transmission coil 12 and the amplification coil 13 are electrically separated from each other, a high-frequency power source 40 is connected to the power transmission coil 12 having a predetermined internal resistance 15, and a resonance capacitor 17 is connected in series to the amplification coil 13 having a predetermined internal resistance 16.
The capacitance of the resonance capacitor 17 is set in consideration of a capacitance component of the amplification coil 13, a capacitance component generated between the amplification coil 13 and a shielding member provided in the periphery, and the like, so that the resonance is performed at the same frequency as the frequency of the current supplied from the high-frequency capacitor 40 to the power transmission coil 12. By connecting the resonance capacitor 17 to the amplification coil 13 in this way, the magnetic flux generated in the power transmission coil 12 can be efficiently amplified by the amplification coil 13.
On the other hand, as described above, the power receiving coil 32 is provided on the conveyance vehicle 30 as the power receiving device. A resonance capacitor 34 and a load resistor 35 are connected in series to the power receiving coil 32 having a predetermined internal resistance 33. In this way, the resonance capacitor 34 is connected in series to the power receiving coil 32 to form a series resonance circuit, and a predetermined voltage is applied to the load resistor 35.
In the above circuit, the voltage applied to the load resistor 35 of the transport vehicle 30, that is, the voltage applied to the electric motor is derived from the following equation (1).
[ formula 1]
In equation (1), Vout is a voltage value applied to the load resistor 35, Vin is a voltage value applied to the power transmission coil 12 from the high-frequency power source 40, L1 is an inductance of the power transmission coil 12, L2 is an inductance of the power reception coil 32, Rout is an inductance of the load resistor 35, and r3 is a resistance value of the internal resistor 33 of the power reception coil 32.
In the formula (1), k12 represents a coupling coefficient between the power transmission coil 12 and the amplification coil 13, and k23 represents a coupling coefficient between the amplification coil 13 and the power reception coil 32. For the coupling coefficient between coils arranged adjacently such as the power transmission coil 12 and the amplification coil 13, the coupling coefficient increases as the distance between coils decreases, and the coupling coefficient decreases as the distance between coils increases. In addition, as for the coupling coefficient between the coils disposed to face each other such as the amplification coil 13 and the power reception coil 32, the larger the facing area is, the larger the coupling coefficient is, and the smaller the facing area is, the smaller the coupling coefficient is.
In the self-propelled conveying system 100 configured as described above, the amplification coil 13 is disposed at a relatively close position of the power transmission coil 12 so that the coupling coefficient between the power transmission coil 12 and the amplification coil 13 is 0.2 or more, preferably 0.5 or more. On the other hand, since the power receiving coil 32 is disposed at a distance from the amplifying coil 13 that is longer than the distance between the power transmitting coil 12 and the amplifying coil 13, the coupling coefficient between the amplifying coil 13 and the power receiving coil 32 is a value lower than the coupling coefficient between the power transmitting coil 12 and the amplifying coil 13, for example, 0.1 or less. In other words, the power transmission coil 12 and the amplification coil 13 are arranged such that the coupling coefficient of the power transmission coil 12 and the amplification coil 13 becomes a value larger than the coupling coefficient of the amplification coil 13 and the power reception coil 32.
Therefore, the voltage applied to the load resistor 35 can be changed by changing the magnitude of the inductance of the power receiving coil 32 shown by L2 in the above expression (1) by changing the number of windings and the outer diameter of the power receiving coil 32, or by changing the magnitude of the gap between the power transmitting coil 12 and the amplifying coil 13 to change the magnitude of the coupling coefficient shown by k12 in the above expression (1), for example.
As shown in fig. 5, even when two or more transport vehicles 30 are present for one transport path unit 11, the relationship of the above equation (1) holds for each transport vehicle 30. Therefore, even if the load resistor 35 has a different magnitude for each of the conveyor vehicles 30, the voltage applied to the load resistor 35 has almost the same magnitude if the inductance of the power receiving coil 32 is the same. That is, even if the weight of the workpiece to be conveyed differs for each of the conveyor vehicles 30, the load resistance 35 of each conveyor vehicle 30, that is, the load of the electric motor of each conveyor vehicle 30 differs, and the voltage applied to the electric motor of each conveyor vehicle 30 is substantially constant without variation. Therefore, even when a plurality of transport vehicles 30 that transport workpieces having different weights travel on one transport path unit 11, the travel of each other is not hindered.
Further, by making the inductance of the power receiving coil 32 different for each of the transport vehicles 30, the voltage applied to the load resistor 35 can be made different in magnitude. Therefore, for example, a plurality of transport vehicles 30 including electric motors driven at different voltages can be caused to travel through the same transport path unit 11.
Next, the operation of the self-propelled conveying system 100 configured as described above will be described.
In order to cause the plurality of transport vehicles 30 to travel along the transport path 10, first, a current is supplied from the high-frequency power supply 40 to the power transmission coil 12 of each transport path unit 11. The power transmission coil 12 generates magnetic flux in accordance with the current supplied from the high-frequency power source 40, and the amplification coil 13 disposed in each of the transmission path units 11 together with the power transmission coil 12 amplifies the magnetic flux generated in the power transmission coil 12.
In the power receiving coil 32 provided in each of the transport vehicles 30, electromagnetic induction is generated by the magnetic flux amplified by the amplifying coil 13. When the power generated by the electromagnetic induction in the power receiving coil 32 is supplied to the controller, the transport vehicle 30 is in a state capable of traveling.
When receiving a travel-related command wirelessly, the controller drives the electric motor in accordance with the command to cause the transport vehicle 30 to travel at a predetermined speed or stop at a predetermined position. Specifically, for example, when the transport vehicle 30 is stopped in front of the first work table 50 and a workpiece is carried into the transport vehicle 30, the transport vehicle 30 is moved to the second work table 51. When the processing of the workpiece in the second work table 51 is completed, the transport vehicle 30 is then moved to the third work table 52. When the assembly of the parts of the workpiece on the third work table 52 is completed, the transport vehicle 30 is then moved to the fourth work table 53. When the workpiece is carried out on the fourth work table 53, the transport vehicle 30 is moved to the first work table 50 again.
In this way, even the transport vehicle 30 not mounted with a battery can move along the transport path 10 by the electric power supplied in a non-contact manner from the transport path 10.
Here, in the case where the amplification coil 13 and the power receiving coil 32 are provided on the side of the transport vehicle 30, when power is supplied from one power transmission coil 12 to a plurality of transport vehicles 30, the magnetic flux generated in the power transmission coil 12 is distributed to the power receiving coil 32 of each transport vehicle 30 via the amplification coil 13. Therefore, the electric power distributed to each transport vehicle 30 varies depending on the number of transport vehicles 30 and the change in the load of the transport vehicle 30, and as a result, stable electric power cannot be secured in each transport vehicle 30, and it may be difficult to run each transport vehicle 30.
In contrast, in the self-propelled conveying system 100 having the above configuration, the amplification coil 13 that amplifies the magnetic flux generated in the power transmission coil 12 is provided on the side of the conveying path 10 together with the power transmission coil 12. Since the magnetic flux generated in the power transmission coil 12 is amplified in advance in the transmission path 10 as the power transmission device, even when there are a plurality of power receiving conveyance vehicles 30, it is possible to stably receive power according to characteristics such as inductance of the power receiving coil 32 in each of the conveyance vehicles 30. As a result, stable electric power can be ensured in each of the transport vehicles 30.
According to the above embodiment, the following effects are obtained.
In the self-propelled conveying system 100 configured as described above, the amplification coil 13 that amplifies the magnetic flux generated in the power transmission coil 12 is provided on the side of the conveying path 10 together with the power transmission coil 12. Since the magnetic flux generated in the power transmission coil 12 is amplified in advance in the transmission path 10 as the power transmission device, even when there are a plurality of power receiving conveyance vehicles 30, it is possible to stably receive power according to characteristics such as inductance of the power receiving coil 32 in each of the conveyance vehicles 30. As a result, stable electric power can be ensured in each of the transport vehicles 30.
Next, a modified example of the above embodiment will be described.
In the above embodiment, the power transmission coil 12 is disposed outside the amplification coil 13 in the conveyance path unit 11. Alternatively, as shown in fig. 6, the power transmission coil 12 may be disposed inside the amplification coil 13 in the conveyance path unit 11. In this case, by changing the magnitude of the first distance D1, which is the gap between the power transmission coil 12 and the amplification coil 13, the magnitude of the coupling coefficient between the power transmission coil 12 and the amplification coil 13 can be changed, and as a result, the power received by the carrier 30 can be changed to an arbitrary magnitude. In addition, when there is enough space on the outside of the amplification coil 13 to change the position of the power transmission coil 12, the size of the gap between the amplification coil 13 and the power transmission coil 12 disposed on the outside of the amplification coil 13 may be changed so that the power received by the transport vehicle 30 is changed to an arbitrary size.
In the above embodiment, the power transmission coil 12, the amplification coil 13, and the power reception coil 32 are formed by winding a single wire or litz wire, respectively. Instead, the power transmission coil 12, the amplification coil 13, and the power reception coil 32 may be formed of conductors wired on a substrate such as a Flexible Printed Circuit (FPC) or a printed circuit board (FR 4).
In the above embodiment, the power receiving device, i.e., the transport vehicle 30, is provided with the series resonant circuit. Alternatively, as shown in fig. 7, a parallel resonance circuit is formed by connecting a resonance capacitor 34 and a load resistor 35 in parallel to a power receiving coil 32 having a predetermined internal resistance 33. In this case, a predetermined current flows to the load resistor 35. In this way, when the current supplied to the power receiving device side is set to a predetermined magnitude, it is effective for charging a battery or the like that requires a constant magnitude of current.
In the above embodiment, the electromotive force generated in the power receiving coil 32 of the transport vehicle 30 is supplied to the electric motor for driving the transport vehicle 30. The electromotive force generated in the power receiving coil 32 may be supplied not only to the electric motor for traveling but also to an electric device such as an electric actuator for operating a working robot or the like provided in the transport vehicle 30.
In the above embodiment, the self-propelled conveying system 100 has been described, but the system for supplying the non-contact power is not limited to this, and may be a system capable of running a plurality of running bodies including an electric motor for running such as an electric vehicle and an electric bicycle. In this case, the electric vehicle and the electric bicycle serve as power receiving devices, and the power transmitting device is buried in a road on which the electric vehicle and the electric bicycle travel. According to the contactless power supply system configured as described above, even when a plurality of electric vehicles and electric bicycles having different loads are traveling, it is possible to stably secure power necessary for traveling in each of the electric vehicles and the electric bicycles. Further, since the electric power necessary for traveling can be always received from the power transmission device, the battery mounted on the electric vehicle or the electric bicycle can be made as small as necessary, and the vehicle weight can be reduced.
In the above embodiment, the case where the power receiving device is moved by having an electric motor as in the case of the transport vehicle 30 has been described, but the power receiving device is not limited to this, and may be simply placed on the power transmitting device for charging. Specifically, as shown in fig. 8, the contactless power supply system may be a charging system 200 that charges a plurality of different small electronic devices 130 at a time, and the small electronic devices 130 may be small audio devices such as smartphones, tablet terminals, mobile phones, portable game machines, digital cameras, and headphones, wearable terminals, and hand-held vacuum cleaners, for example.
The charging system 200 includes, similarly to the self-propelled conveying system 100: a power transmission unit 110 as a power transmission device, a plurality of electronic devices 130 as power reception devices to which power is supplied from the power transmission unit 110, and a high-frequency power supply 40 as a power supply for supplying high-frequency power to the power transmission unit 110.
As shown in fig. 8, the power transmission unit 110 includes a power transmission coil 12 and an amplification coil 13 disposed inside the power transmission coil 12. The electronic device 130 includes a battery, not shown, as a storage battery and a power receiving coil 32 electromagnetically couplable to the amplifying coil 13.
In the power receiving coil 32, electromagnetic induction is generated by the magnetic flux amplified in the opposite amplifying coil 13. The electromotive force generated by the electromagnetic induction in the power receiving coil 32 is thus charged in the battery of the electronic apparatus 130. The electronic device 130 may have a rectifier circuit, not shown, between the power receiving coil 32 and the battery.
When the power receiving coil 32 of the electronic device 130 is placed on the power transmission coil 12 and the arc portions 12b and 13b of the amplification coil 13, the supplied power may become unstable due to a decrease in the coupling coefficient between the amplification coil 13 and the power receiving coil 32. Therefore, it is preferable that a charging block display 60 is provided in fig. 8 so that the electronic device 130 is placed on the parallel portions 12a and 13a of the power transmission coil 12 and the amplification coil 13, the charging block display 60 being surrounded by a chain line, the charging block display 60 indicating a region in which the coupling coefficient between the amplification coil 13 and the power reception coil 32 is stable and charging is performed relatively efficiently. For example, the charging block indicator 60 is displayed on a mounting plate, not shown, which is formed of a non-magnetic material such as resin so as to cover the power transmission coil 12 and the amplification coil 13.
According to the charging system 200 configured as described above, even when a plurality of small-sized electronic devices 130 different in power required for charging are arranged in a single power transmission device, power required for charging each of the small-sized electronic devices 130 can be stably secured.
Although the parallel portions 12a, 13a and the arc portions 12b, 13b of the power transmission coil 12 and the amplification coil 13 of the power transmission unit 110 shown in fig. 8 are provided on the same plane, the arc portions 12b, 13b may be bent with respect to the parallel portions 12a, 13a, and the adjacent power transmission units 110 may be disposed close to each other so that the bent portions face each other, as in the conveyance path unit 11 of the above-described embodiment. This allows the plurality of power transmission units 110 to be arranged in series. Further, by providing the power transmission unit 110 in which the parallel portions 12a and 13a are not formed linearly but formed in an arc shape, and appropriately combining the power transmission unit 110 in which the parallel portions 12a and 13a are formed linearly and the power transmission unit 110 in which the parallel portions 12a and 13a are formed in an arc shape, it is possible to freely lay out the region for charging.
The small-sized electronic device 130 is not limited to a smartphone and the like, and may be any electronic device provided with a battery, for example, an electronic device provided with a battery such as a notebook computer and a heated cigarette.
Hereinafter, the structure, operation, and effects of the embodiments of the present invention will be summarized.
In the contactless power supply systems 100 and 200, the transmission path 10 and the power transmission unit 110, which are power transmission devices, include: a power transmission coil 12 connected to a high-frequency power source 40 and generating magnetic flux; and an amplifying coil 13 that amplifies magnetic flux generated in the power transmission coil 12, and the power receiving device, i.e., the transport vehicle 30 and the electronic device 130, have a power receiving coil 32 electromagnetically coupled to the amplifying coil 13.
In this configuration, the amplification coil 13 that amplifies the magnetic flux generated in the power transmission coil 12 is provided on the side of the transmission path 10 and the power transmission unit 110 together with the power transmission coil 12. Since the magnetic flux generated in the power transmission coil 12 is amplified in advance in the power transmission device, that is, the transmission path 10 and the power transmission unit 110, even when there are a plurality of transport vehicles 30 and electronic devices 130 that receive electric power, it is possible to stably receive electric power according to characteristics such as inductance of the power reception coil 32 in each of the transport vehicles 30 and the electronic devices 130. As a result, stable electric power can be ensured in each of the transport vehicle 30 and the electronic device 130.
At least a part of the power transmission coil 12 and the amplification coil 13 are disposed on the same plane.
In this configuration, at least a part of the power transmission coil 12 and the amplification coil 13 provided in the transmission path 10 and the power transmission unit 110 are disposed on the same plane. By disposing the power transmission coil 12 and the amplification coil 13 on the same plane in the power transmission device, i.e., the transmission path 10 and the power transmission unit 110, the magnetic flux generated in the power transmission coil 12 can be efficiently amplified by the amplification coil 13. Therefore, even when there are a plurality of the transport vehicles 30 and the electronic devices 130 that receive electric power, electric power according to characteristics such as inductance of the power receiving coil 32 can be stably received in each of the transport vehicles 30 and the electronic devices 130, and as a result, stable electric power can be ensured in each of the transport vehicles 30 and the electronic devices 130.
The conveyance path 10 and the power transmission unit 110 simultaneously supply electric power to the plurality of conveyance vehicles 30 and the electronic devices 130.
In this configuration, electric power is simultaneously supplied from the transmission path 10 and the power transmission unit 110 to the plurality of transport vehicles 30 and the electronic devices 130. In the transmission path 10 and the power transmission unit 110, which are power transmission devices, the magnetic flux generated in the power transmission coil 12 is amplified in advance by the amplification coil 13. Therefore, even when there are a plurality of power receiving transport vehicles 30 and electronic devices 130, power can be supplied to them at the same time.
The power transmission coil 12 and the amplification coil 13 are formed in a ring shape, and have parallel portions 12a and 13a and a pair of arcuate portions 12b and 13b provided at the ends of the parallel portions 12a and 13a, and the plurality of transport vehicles 30 move on the transport path 10 along the parallel portions 12a and 13 a. The plurality of electronic devices 130 are mounted on the power transmission unit 110 along the parallel portions 12a and 13 a.
In this configuration, the plurality of transport carriages 30 move on the transport path 10 along the parallel portions 12a and 13a of the power transmission coil 12 and the amplification coil 13, and the plurality of electronic devices 130 are mounted along the parallel portions 12a and 13a of the power transmission coil 12 and the amplification coil 13. By configuring to supply power to the power receiving device only in the parallel portions 12a and 13a in which the supplied power is relatively stable so as to avoid the arc portions 12b and 13b in which the supplied power is unstable in this way, it is possible to secure stable power in the transport vehicle 30 and the small-sized electronic device 130.
In addition, the voltage received in the conveyance carriage 30 and the electronic device 130 varies depending on the coupling coefficient of the power transmission coil 12 and the amplification coil 13.
In this configuration, the voltage received in the conveyance carriage 30 and the electronic device 130 varies depending on the coupling coefficient of the power transmission coil 12 and the amplification coil 13. The coupling coefficient between the power transmission coil 12 and the amplification coil 13 is changed by changing the interval between the power transmission coil 12 and the amplification coil 13. Therefore, by appropriately changing the distance between the power transmission coil 12 and the amplification coil 13 and the like in accordance with the voltage required for the transport vehicle 30 and the small-sized electronic device 130, it is possible to supply stable power to each of the transport vehicle 30 and the small-sized electronic device 130.
In addition, the voltage received by the transport vehicle 30 and the electronic device 130 varies according to the inductance of the power receiving coil 32.
In this configuration, the voltage received by the conveyance vehicle 30 and the electronic device 130 varies according to the inductance of the power receiving coil 32. The inductance of the power receiving coil 32 is changed by changing the number of windings and the outer diameter of the power receiving coil 32. Therefore, by appropriately changing the number of windings and the outer diameter of the power receiving coil 32 according to the voltage required for each of the transport vehicle 30 and the electronic device 130, different electric power can be supplied to each of the transport vehicle 30 and the electronic device 130.
The conveyance path 10 includes a plurality of conveyance path units 11, the plurality of conveyance path units 11 include a power transmission coil 12 and an amplification coil 13, and the conveyance path units 11 are arranged adjacent to each other. The power transmission unit 110 includes a plurality of power transmission units 110, the plurality of power transmission units 110 include a power transmission coil 12 and an amplification coil 13, and the power transmission units 110 are arranged adjacent to each other.
In this configuration, the conveyance path 10 is configured by arranging a plurality of conveyance path units 11 having the power transmission coil 12 and the amplification coil 13 in an adjacent manner. In this way, by configuring the conveyance path 10 as a power transmission device with a plurality of units, the path of the conveyance path 10 can be freely set according to the arrangement of the work tables 50 to 53. In the case of the power transmission unit 110 used for charging the plurality of small-sized electronic devices 130, by arranging the plurality of power transmission units 110 adjacent to each other, the number of blocks capable of supplying power can be increased or decreased freely according to the number of small-sized electronic devices 130, and the layout of the blocks capable of supplying power can be changed freely.
The power transmission coil 12 and the amplification coil 13 are formed in an annular shape, and have parallel portions 12a and 13a and a pair of arc portions 12b and 13b provided at the ends of the parallel portions 12a and 13a, and the arc portions 12b and 13b are bent so as to be away from the transport vehicle 30 or the electronic device 130 in the bent portions 12c and 13c between the arc portions 12b and 13b and the parallel portions 12a and 13 a.
In this configuration, the arc portions 12b and 13b of the power transmission coil 12 and the amplification coil 13 provided in the transmission path unit 11 and the power transmission unit 110 are bent so as to be away from the transmission path 30 or the electronic device 130. That is, the arc portions 12b and 13b of the power transmission coil 12 and the amplification coil 13 do not face the power reception device, that is, the transport vehicle 30 and the electronic device 130, and only the parallel portions 12a and 13a face the power reception device, that is, the transport vehicle 30 and the electronic device 130. In this way, by configuring to supply power to the transport vehicle 30 and the electronic device 130 only in the parallel portions 12a and 13a in which the supplied power is relatively stable so as to avoid the arc portions 12b and 13b in which the supplied power is unstable, it is possible to secure stable power in the transport vehicle 30 and the electronic device 130.
The plurality of conveyance path units 11 are arranged adjacent to each other so that the bent portions 12c and 13c face each other. The plurality of power transmission units 110 are arranged adjacent to each other so that the bent portions 12c and 13c face each other.
In this configuration, the plurality of conveyance path units 11 or the plurality of power transmission units 110 are arranged adjacent to each other so that the bent portions 12c and 13c face each other. By arranging the plurality of conveyance path units 11 adjacent to each other as if the parallel portions 12a, 13a were connected in this way, it is possible to supply power continuously and stably to the conveyance vehicles 30 that travel from one conveyance path unit 11 to the other conveyance path unit 11. In the case of the power transmission unit 110 used for charging the plurality of small-sized electronic devices 130, by disposing the plurality of transmission path units 110 adjacent to each other as if the parallel portions 12a and 13a were connected to each other, even when the small-sized electronic devices 130 are placed on the boundary between the two power transmission units 110, it is possible to stably supply electric power to the electronic devices 130.
A shielding plate 22 made of a soft magnetic material is provided between one of the arc portions 12b and 13b and the other of the arc portions 12b and 13b of the two conveyance path units 11 or the two power transmission units 110 arranged adjacent to each other.
In this configuration, a shielding plate 22 made of a soft magnetic material is provided between one of the arc portions 12b and 13b and the other arc portion 12b and 13b of the two conveyance path units 11 or the two power transmission units 110 arranged adjacently. By providing the shielding plate 22 made of the soft magnetic material between one of the arc portions 12b and 13b and the other of the arc portions 12b and 13b, the shielding plate 22 cuts off the magnetic fluxes flowing toward each other. Therefore, even if the conveyance path unit 11 or the power transmission unit 110 is disposed adjacent to each other, stable magnetic flux is generated in each of the conveyance path unit 11 and the power transmission unit 110, and as a result, stable power can be ensured in the power receiving device such as the conveyance vehicle 30 or the small-sized electronic device 130.
The transport vehicle 30 and the electronic device 130 have a resonance capacitor 34 that forms a series resonance circuit or a parallel resonance circuit with the power receiving coil 32.
In this configuration, the transport vehicle 30 and the electronic device 130 as the power receiving devices include the resonance capacitor 34 that forms a series resonance circuit or a parallel resonance circuit with the power receiving coil 32. When the power receiving coil 32 and the resonance capacitor 34 form a series resonance circuit, a voltage of a predetermined magnitude can be secured in the transport vehicle 30 and the electronic device 130, and when the power receiving coil 32 and the resonance capacitor 34 form a parallel resonance circuit, a current of a predetermined magnitude can be secured in the transport vehicle 30 and the electronic device 130. Therefore, by providing a resonance circuit according to the specification of the power receiving device, the power required by the power receiving device can be stably ensured.
Although the embodiments of the present invention have been described above, the above embodiments are merely some of application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments.
The application claims priority based on Japanese patent application 2019-036349, filed to the office on 28.2.2019, the entire contents of which are incorporated herein by reference.
Claims (13)
1. A non-contact power supply system for supplying power from a power transmitting device to a power receiving device in a non-contact manner,
the power transmitting device includes:
a power transmission coil connected to a power source and generating a magnetic flux;
an amplifying coil that amplifies a magnetic flux generated in the power transmitting coil,
the power receiving device has a power receiving coil electromagnetically coupled with the amplification coil.
2. The non-contact power supply system according to claim 1,
the power transmission coil and at least a part of the amplification coil are disposed on the same plane.
3. The non-contact power supply system according to claim 1 or 2,
the power transmitting device simultaneously supplies power to the plurality of power receiving devices.
4. The non-contact power supply system according to claim 3,
the power transmission coil and the amplification coil are formed in an annular shape and have a parallel portion and a pair of connection portions provided at ends of the parallel portion,
the plurality of power receiving devices move on the power transmitting device along the parallel portion, or are mounted on the power transmitting device along the parallel portion.
5. The non-contact power supply system according to any one of claims 1 to 4,
the voltage received in the power receiving device varies according to the coupling coefficient of the power transmitting coil and the amplifying coil.
6. The non-contact power supply system according to any one of claims 1 to 5,
the voltage received in the power receiving device varies according to the inductance of the power receiving coil.
7. The non-contact power supply system according to any one of claims 1 to 6,
the power transmitting apparatus has a plurality of power transmitting units having the power transmitting coil and the amplifying coil,
the power transmission units are arranged in an adjacent manner.
8. The non-contact power supply system according to claim 7,
the power transmitting coil and the amplifying coil are formed in an annular shape, and have a parallel portion and a pair of connection portions provided at ends of the parallel portion, and the connection portion side is bent so as to be away from the power receiving device in a bending portion between the connection portion and the parallel portion.
9. The non-contact power supply system according to claim 8,
the plurality of power transmission units are disposed adjacent to each other so that the bent portions face each other.
10. The non-contact power supply system according to claim 9,
a soft magnetic member is provided between the one connecting portion and the other connecting portion of the two power transmission units arranged adjacent to each other.
11. The non-contact power supply system according to any one of claims 1 to 10,
the power receiving device further includes a resonance capacitor that forms a series resonance circuit or a parallel resonance circuit with the power receiving coil.
12. The non-contact power supply system according to any one of claims 1 to 11,
the power receiving device is provided on a traveling body including an electric motor for traveling.
13. The non-contact power supply system according to any one of claims 1 to 11,
the power receiving device is provided in an electronic apparatus having a battery.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019036349 | 2019-02-28 | ||
| JP2019-036349 | 2019-02-28 | ||
| PCT/JP2019/018100 WO2020174702A1 (en) | 2019-02-28 | 2019-04-26 | Non-contact power supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113302815A true CN113302815A (en) | 2021-08-24 |
| CN113302815B CN113302815B (en) | 2023-12-05 |
Family
ID=72239273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980088725.1A Active CN113302815B (en) | 2019-02-28 | 2019-04-26 | Non-contact power supply system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7155389B2 (en) |
| CN (1) | CN113302815B (en) |
| WO (1) | WO2020174702A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110832738A (en) * | 2017-09-12 | 2020-02-21 | 株式会社村田制作所 | Power transmission device and power reception device |
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| JP2002137659A (en) * | 2000-08-23 | 2002-05-14 | Shinko Electric Co Ltd | Non-contact feeder |
| JP2014187843A (en) * | 2013-03-25 | 2014-10-02 | Nitto Denko Corp | Power receiving voltage control method of power-supplied apparatus supplied with power by wireless power transmission, wireless power transmission device adjusted by the power receiving voltage control method, and manufacturing method of the wireless power transmission device |
| CN104885169A (en) * | 2012-12-27 | 2015-09-02 | 株式会社自动网络技术研究所 | Reactor, converter, and power conversion device |
| CN106233574A (en) * | 2014-05-07 | 2016-12-14 | 株式会社Ihi | Contactless power supply system and current-collecting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH118903A (en) * | 1997-06-16 | 1999-01-12 | Hitachi Kiden Kogyo Ltd | Non-contact power supply facility for moving body |
| WO2012132841A1 (en) * | 2011-03-29 | 2012-10-04 | ソニー株式会社 | Power supply device, power supply system, and electronic device |
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2019
- 2019-04-26 JP JP2021501525A patent/JP7155389B2/en active Active
- 2019-04-26 CN CN201980088725.1A patent/CN113302815B/en active Active
- 2019-04-26 WO PCT/JP2019/018100 patent/WO2020174702A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002137659A (en) * | 2000-08-23 | 2002-05-14 | Shinko Electric Co Ltd | Non-contact feeder |
| CN104885169A (en) * | 2012-12-27 | 2015-09-02 | 株式会社自动网络技术研究所 | Reactor, converter, and power conversion device |
| JP2014187843A (en) * | 2013-03-25 | 2014-10-02 | Nitto Denko Corp | Power receiving voltage control method of power-supplied apparatus supplied with power by wireless power transmission, wireless power transmission device adjusted by the power receiving voltage control method, and manufacturing method of the wireless power transmission device |
| CN106233574A (en) * | 2014-05-07 | 2016-12-14 | 株式会社Ihi | Contactless power supply system and current-collecting device |
| JP2017050992A (en) * | 2015-09-02 | 2017-03-09 | 株式会社日本自動車部品総合研究所 | Power transmission unit for wireless power supply device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110832738A (en) * | 2017-09-12 | 2020-02-21 | 株式会社村田制作所 | Power transmission device and power reception device |
| CN110832738B (en) * | 2017-09-12 | 2023-08-22 | 株式会社村田制作所 | Power transmitting device and power receiving device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113302815B (en) | 2023-12-05 |
| WO2020174702A1 (en) | 2020-09-03 |
| JPWO2020174702A1 (en) | 2021-12-23 |
| JP7155389B2 (en) | 2022-10-18 |
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