JP2023166788A - Power supply device burying structure and power supply device burying method - Google Patents

Abstract

To bury a power supply device for contactlessly supplying power to a power reception device provided on a movable body in the vicinity of a road surface of a driving lane having asphalt pavement by achieving high workability and adhesiveness.SOLUTION: In a power supply device burying structure, a power supply device for contactlessly supplying power to a power reception device provided on a movable body moving on a driving lane is buried in the driving lane. The power supply device has a power supply coil and a coil case to store the power supply coil and is formed by burying the coil case in a pavement of the driving lane constructed by curing asphalt mixture. Intermediate members for forming a rough surface are provided on a surface of the coil case.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power supply device embedding structure and a power supply device embedding method for burying a power supply device that non-contactly supplies power to a power receiving device installed on a moving body in a running path.

BACKGROUND ART Research and development on wireless power transmission, which performs contactless power transmission by utilizing a magnetic field resonance phenomenon that occurs between a power supply device and a power receiving device, has been progressing.

For example, Patent Document 1 discloses that a non-contact power supply device including a power reception resonance means and a power supply resonance means is configured to change the frequency of AC power according to the value of impedance seen from the power supply side within a predetermined frequency. A configuration is disclosed in which a frequency variable means for setting is provided. Thereby, even if the coupling state between the power reception resonance means and the power supply resonance means changes, a frequency with higher power transmission efficiency can be set, and a decrease in power transmission efficiency can be suppressed.

Such technology is utilized in various fields, and is particularly expected to be used in in-motion power supply systems that supply electric power to moving vehicles. In a running power supply system, a power supply coil included in a power supply device and a resonant capacitor connected in series with the power supply coil are provided on the road side, and a power reception device including a power reception coil is provided on the vehicle side. This attempts to supply power continuously or intermittently to a running vehicle in a non-contact manner.

Japanese Patent Application Publication No. 2010-233442

As mentioned above, if it becomes possible to wirelessly supply power by burying a power supply device on the road side, it will be possible to address the problems of electric vehicles such as short cruising time and long charging time. This will encourage the use of electric vehicles and contribute to reducing carbon dioxide emissions from transportation.

Generally, a power supply device houses a power supply coil that transmits high-frequency power in a coil case and buries it in a running road. When burying the power supply device in a running road, it is preferable to bury the power supply device at a shallow depth near the road surface, that is, in the pavement, in consideration of power transmission efficiency.

However, coil cases are not manufactured with consideration to adhesion to pavement. Therefore, if the vertical load of an electric vehicle or the like is repeatedly transmitted over a long period of time, problems such as rattling may occur. Furthermore, when asphalt pavement is used for pavement, the construction process includes pouring an asphalt mixture at a temperature of over 200°C onto the roadbed. For this reason, if the asphalt pavement construction work and the work of embedding the power supply device in the asphalt pavement are attempted to proceed simultaneously, the power supply device will be exposed to a high temperature environment exceeding 200° C., and there is a risk that it will be damaged.

The present invention was made in view of such problems, and its main purpose is to install a power supply device that non-contactly supplies power to a power receiving device installed on a moving body near the road surface of a running road with asphalt pavement. , to bury it with high workability and adhesion. , buried with high workability and adhesion.

In order to achieve such an object, the buried structure of a power supply device of the present invention is a buried structure of a power supply device in which a power supply device that non-contactly supplies power to a power receiving device provided on a moving body is buried in a running path, The power supply device includes a power supply coil and a coil case that houses the power supply coil, and the coil case is embedded in the pavement of the traveling road constructed by curing an asphalt mixture, and on the surface of the coil case, It is characterized in that an intermediate member forming a rough surface is provided.

In the buried structure of the power supply device of the present invention, the intermediate member has thermal conductivity or heat capacity capable of blocking or delaying conduction of heat of the asphalt mixture between the intermediate member and the coil case during construction of the pavement. It is characterized by having the following.

The buried structure of the power supply device of the present invention is characterized in that the intermediate member includes an air layer or a vacuum layer.

The buried structure of the power supply device of the present invention is characterized in that the pavement is a semi-flexible pavement.

The buried structure of the power supply device of the present invention is characterized in that the running path is a road.

The method for burying a power supply device of the present invention is a method for burying a power supply device for constructing a buried structure for a power supply device of the present invention, in which the asphalt mixture is poured and the coil case is buried in the asphalt mixture. It is characterized by

According to the power feeding device embedding structure and power feeding device burying method of the present invention, a rough surface made of the intermediate member is formed on the coil case housing the power feeding coil, and the adhesion to the asphalt pavement that constitutes the driving path is improved. It is being Therefore, even if the vertical load of a moving body or the like is repeatedly transmitted to the coil case, the coil case does not wobble, and it is possible to stably bury the coil case near the asphalt pavement surface over a long period of time.

Further, the intermediate member may include a material having thermal conductivity or heat capacity capable of blocking or delaying conduction of heat of the asphalt mixture between the coil case and the asphalt mixture during construction of the pavement, or an air layer. Adopt a three-dimensional mesh or a piece of wood. Then, the intermediate member reduces heat conduction from the asphalt mixture that exceeds 200° C. to the coil case during casting. Thereby, equipment that is vulnerable to high temperatures, including the coil case and the power supply coil housed therein, can be prevented from being exposed to a high-temperature environment.

According to the present invention, it is possible to bury a power supply device of a running power supply system that continuously or intermittently supplies power to a moving moving object while it is running near an asphalt pavement with high workability and adhesion. .

It is a figure showing the embedding structure and method of the power feeding device in an embodiment of the present invention (a 1st embodiment). 1 is a diagram schematically showing a power supply device in an embodiment of the present invention (first embodiment); FIG. It is a figure which shows the embedding structure and method of the power supply device in embodiment of this invention (2nd Embodiment). It is a figure which shows the embedding structure and method of the power supply device in embodiment of this invention (3rd Embodiment). It is a figure which shows the embedding structure and method of the power supply device in embodiment of this invention (4th Embodiment).

The present invention relates to a buried structure when a power supply device constituting a power supply system while driving is buried in a running road, and in particular, it relates to a buried structure for burying a power supply device constituting a power supply system while driving, and in particular, a structure constructed by hardening an asphalt mixture, such as an asphalt pavement layer or a semi-flexible pavement body. Suitable for embedding in pavement.

A moving object that moves using the running power supply system is not limited in any way as long as it is an electric vehicle that runs by driving a motor using electric power. In addition, if the road on which the power supply device is buried has a structure that allows for asphalt pavement, such as a general road, expressway, parking lot, or roadway built in a factory site, etc. But that's fine.

In this embodiment, a case where the travel route is a road will be taken as an example, and details of the buried structure and method of burying the power supply device will be explained with reference to FIGS. 1 to 5. Before explaining the buried structure of the power supply device, first, the in-running power supply system will be explained.

≪≪≪Driving power supply system 100≫≫≫
As shown in FIGS. 1(a) and 1(b), the running power supply system 100 includes a power receiving device 20 mounted on an electric vehicle V and an asphalt pavement layer 31 of a road 30 formed by hardening an asphalt mixture 311. A power supply device 10 is provided.

The power supply device 10 includes a power supply coil 11 housed in a coil case 13 and a power supply device 12 connected to the power supply coil 11. The power supply device 12 generates high frequency power. The generated high frequency power is output to the power feeding coil 11. On the other hand, the power receiving device 20 includes a power receiving coil 21 and a load 22. The load 22 is connected to a power receiving coil 21, and the power receiving coil 21 is connected in series with a resonant capacitor (not shown) provided on the electric vehicle V side to form a series resonant circuit.

Thereby, the power receiving coil 21 and the power feeding coil 11 are magnetically coupled by magnetic field resonance, and high frequency power is transmitted from the power feeding device 10 to the power receiving coil 21. The transmitted high-frequency power is supplied to the load 22 of the electric vehicle V. In this way, the running power supply system 100 can wirelessly supply power from the power supply device 10 embedded in the asphalt pavement layer 31 to the power receiving device 20 mounted on the electric vehicle V.

≪≪Buried structure of power supply device≫≫
In the above-described driving power supply system 100, the power supply coil 11 of the power supply device 10 is embedded in the asphalt pavement layer 31 of the road 30 while being housed in a coil case 13 as shown in FIG. 2(a).

The coil case 13 is made of impact-resistant material (for example, polycarbonate, polypropylene, hard rubber). Further, the entire structure including the outlet portion of the wire forming the power feeding coil 11 is provided with a structure that improves waterproof performance. Further, as shown in FIG. 2(b), the coil case 13 is provided with a plurality of intermediate members 14 on the surface facing the asphalt pavement layer 31.

The intermediate member 14 is made of a material that can form a rough surface on the coil case 13 and has low thermal conductivity or high heat capacity. Thermal conductivity or heat capacity is the degree to which the asphalt mixture 311 can block or delay the conduction of heat between it and the coil case 13 during construction of the asphalt pavement layer 31, as shown in FIG. 1(a). is preferred. Specifically, examples of the intermediate member 14 include pieces of concrete and crushed stone. These may be attached to the coil case 13 using an appropriate fixing means such as an adhesive, for example.

As shown in FIG. 1(b), the asphalt mixture 311 that forms the asphalt pavement layer 31 by curing may be a heated asphalt mixture, a heated asphalt mixture applied at room temperature, or whatever is used for paving the road 30. Either is fine.

<<First embodiment>>
The coil case 13 of the power supply device 10 having the above configuration is preferably buried near the road surface 33 of the road 30 in consideration of power transmission efficiency. For this reason, FIGS. 1A and 1B illustrate the case where the coil case 13 is buried in the asphalt pavement layer 31 so as to be continuous with the road surface 33 with the upper surface covered with a cover material C or the like. ing. The procedure for embedding the power supply device 10 in the asphalt pavement layer 31 in this manner is as follows.

As shown in FIG. 1(b), a high-temperature asphalt mixture 311 is placed on the roadbed 32, and the coil case 13 is buried in the asphalt mixture 311. The coil case 13 is set at approximately the same height as the road surface 33 of the road 30. Further, the asphalt mixture 311 is subjected to operations necessary for road structure, such as leveling and compaction, similar to general road construction. Thereafter, after the asphalt mixture 311 is cured until hardened, the coil case 13 is covered with a cover material C made of an elastic material such as rubber.

As described above, the coil case 13 is provided with a plurality of intermediate members 14 on the side peripheral surface facing the asphalt mixture 311 and on the lower surface. Therefore, during the curing period of the asphalt mixture 311, the heat of the asphalt mixture 311 is transferred to the intermediate member 14, but because the intermediate member 14 has a low thermal conductivity or a large heat capacity, the heat conduction to the coil case 13 is blocked or Can be delayed. Thereby, the coil case 13 and the power feeding coil 11 housed therein can be prevented from being exposed to a high temperature environment.

Further, as shown in FIG. 1(a), when the asphalt mixture 311 is hardened and the asphalt pavement layer 31 is constructed, the coil case 13 whose surface has been formed into a rough surface by the intermediate member 14 is attached to the asphalt pavement layer 31. be closely integrated with.

As a result, the coil case 13 can be buried stably in the vicinity of the road surface 33 of the asphalt pavement layer 31 over a long period of time without causing rattling even when the vertical load of the electric vehicle V etc. is repeatedly transmitted to the coil case 13. becomes. Such a structure is suitable, for example, for a road 30 with low traffic volume, and the coil case 13 is preferably manufactured to have a robust structure.

<<Second embodiment>>
On the other hand, on a road 30 with heavy traffic, the entire coil case 13 is buried in an asphalt pavement layer 31, as shown in FIG. 3(a). At this time, the embedding depth of the coil case 13 may be appropriately set to a shallow position that has little influence on the power transmission efficiency in the power feeding coil 11. The procedure for embedding the power supply device 10 in the asphalt pavement layer 31 is as follows.

First, as in the first embodiment, as shown in FIG. 3(b), an asphalt mixture 311 is placed on the roadbed 32, and the coil case 13 is buried in the asphalt mixture 311. The entire coil case 13 is buried in the asphalt mixture 311. Therefore, the intermediate member 14 is installed not only on the side peripheral surface and the lower surface of the coil case 13 but also on the upper surface.

If the upper surface of the coil case 13 can be stiffened by providing the intermediate member 14 in this way, the thickness of the upper surface of the coil case 13 can be made thinner and the housed power feeding coil 11 can be brought closer to the road surface 33. Good too. In this way, it is also possible to contribute to improving the power transmission efficiency in the power supply device 10.

In the first and second embodiments described above, a member that can form a rough surface on the coil case 13 and is made of a material with low thermal conductivity or large heat capacity is used as the intermediate member 14. It is not limited to this. In the third embodiment, a case where a member having an air layer is employed as the intermediate member 14 will be described as an example.

<<Third embodiment>>
As shown in FIG. 4(a), the entire surface of the coil case 13 embedded in the asphalt pavement layer 31 is covered with a three-dimensional mesh body 15. The three-dimensional network body 15 has a three-dimensional structure formed by fusing or connecting long fibers of thermoplastic resin in a three-dimensional direction. Examples include woven fabrics as shown in Figure 4(b) and nonwoven fabrics in which long fibers are accumulated in one direction or randomly as shown in Figure 4(c). Can be done. All of these are so-called thermoplastic three-dimensional network fiber structures that are generally used as civil engineering materials, and have an air layer inside.

Therefore, as shown in FIG. 4A, when the coil case 13 is installed using a fixing means such as an adhesive, a heat insulating layer surrounding the coil case 13 can be formed. Thereby, during the curing period of the asphalt mixture 311, the three-dimensional network body 15 can block or delay heat conduction to the coil case 13.

Moreover, if the three-dimensional mesh body 15 is installed to cover the coil case 13, a rough surface can be formed on the surface of the coil case 13. Therefore, the adhesion between the asphalt mixture 311 and the asphalt pavement layer 31 after hardening can be improved.

Furthermore, the three-dimensional network body 15 is made of a material whose impact resilience can be controlled. Therefore, after the road 30 is put into service, the vertical load of the electric vehicle V etc. that is repeatedly transmitted from the road surface 33 to the coil case 13 can be efficiently absorbed, and the power supply coil 11 housed in the coil case 13 can be protected from external forces such as shocks and vibrations. can be protected.

Examples of the intermediate member having an air layer include not only the three-dimensional network body 15 described above but also a piece of wood 16 as shown in FIG. 5, for example. Further, in the first to third embodiments, the asphalt pavement layer 31 is provided as the pavement of the road 30, but a semi-flexible pavement body 34 may be adopted instead.

≪Fourth embodiment≫
FIGS. 5A and 5B show a construction method in which a piece of wood 16 is used as an intermediate member and a semi-flexible pavement body 34 is used to pave the road 30.

The semi-flexible pavement 34 is a pavement that has excellent plastic deformation resistance and can suppress the occurrence of rutting, and as shown in FIG. It is built by instilling the

On the other hand, since the wood piece 16 is a material containing air, it has heat insulating properties. Further, as is known from the burning margin design method, when the wood piece 16 is exposed to high temperatures, a carbonized layer is formed on its outer surface, making it difficult for heat to be transmitted to its interior. Furthermore, when a char layer is formed, oxygen necessary for combustion is not supplied to the inside of the wood piece 16, and the progress of combustion is suppressed.

Therefore, in FIG. 5A, a high-temperature open-grain asphalt mixture 341 is placed on the roadbed 32, and the coil case 13 is buried in this open-grain asphalt mixture 341. A piece of wood 16 is provided on the entire surface of the coil case 13 via a fixing means such as an adhesive. As described above, even if the wood chips 16 come into contact with the high-temperature open-grain asphalt mixture 341, only a carbonized layer is formed on the surface and the wood chips 16 do not burn.

Further, during the curing period of the asphalt mixture 311, heat conduction to the coil case 13 can be blocked or delayed due to the heat insulating effect due to the air layer of the carbonized layer and the wood chips 16. Thereby, the coil case 13 and the power feeding coil 11 housed therein can be prevented from being exposed to a high temperature environment.

After the open asphalt mixture 341 has hardened and the temperature has decreased, cement milk 342 is infiltrated into the voids of the open asphalt mixture 341, as shown in FIG. 5(b). As a result, the semi-flexible pavement body 34 is constructed. Furthermore, the cement milk 342 is also filled in the gap between the wood chips 16 and the open-grained asphalt mixture 341. Therefore, the semi-flexible pavement body 34 and the coil case 13 can be integrated.

By embedding the coil case 13 in the semi-flexible pavement 34 in this manner, ruts are less likely to occur on the road surface 33 even if the road 30 is used for a long period of time. As a result, as shown in FIG. Changes over time can be avoided. Therefore, the buried structure of the power supply device 10 can stably maintain power transmission efficiency over a long period of time.

It goes without saying that the embedding structure of the power feeding device and the burying method of the power feeding device of the present invention are not limited to the above-described embodiments, and various changes can be made without departing from the spirit of the present invention. Nor.

Further, in this embodiment, a case where only the power feeding coil is housed in the coil case is illustrated, but the present invention is not limited to this. Other equipment (such as a resonant capacitor) used in the power supply equipment may be housed in the coil case together with the power supply coil. Furthermore, other equipment used for the power supply equipment may be housed alone.

Further, the asphalt mixture 311 constituting the asphalt pavement layer 31 is not limited in any way in terms of the blending ratio of aggregate and asphalt binder, porosity, etc. Moreover, the asphalt mixture 311 may be poured in multiple layers or may be poured in one layer.

Similarly, with respect to the open-grained asphalt mixture 341 constituting the semi-flexible pavement 34, there are no restrictions on the blending ratio of aggregate and asphalt binder, or the porosity. Furthermore, any type of cement milk 342 can be used as long as it is a material used in the asphalt pavement layer 31.

Therefore, if cement milk 342, which is made mainly from low-carbon cement that can significantly reduce CO ₂ emissions, is used, the buried structure of power supply device 10 using semi-flexible pavement 34 can be made environmentally friendly. It is also possible to create a structure with

Furthermore, in this embodiment, as the semi-flexible pavement 34, a fully permeable type in which the cement milk 312 permeates the entire surface is exemplified, but the present invention is not limited to this, and a semi-permeable type in which the cement milk 312 permeates only into the upper half is used. May be adopted.

Furthermore, regarding the power feeding coil 11 that constitutes the in-running power feeding system 100, in this embodiment, a "magnetic coupling method" is cited as an example, but an "electrolytic coupling method" may also be adopted.

Further, in this embodiment, intermediate members having an air layer, such as the three-dimensional mesh body 15 or the wooden piece 16, are used as examples, but the intermediate member is not limited to this, and a member having a vacuum layer may also be adopted. .

100 Running power supply system 10 Power supply device 11 Power supply coil 12 Power supply device 13 Coil case 14 Intermediate member 15 Three-dimensional mesh body (intermediate member)
16 Wood piece (intermediate member)
20 Power receiving device 21 Power receiving coil 22 Load 30 Road 31 Asphalt pavement layer 311 Asphalt mixture 32 Roadbed 33 Road surface 34 Semi-flexible pavement 341 Open-grained asphalt mixture 342 Cement milk C Cover material V Electric vehicle

Claims (7)

A buried structure of a power supply device in which a power supply device that non-contactly supplies power to a power receiving device installed on a moving body is buried in a running road,
The power supply device includes a power supply coil and a coil case that houses the power supply coil,
The coil case is buried in the pavement of the running road constructed by curing an asphalt mixture,
An embedded structure for a power supply device, characterized in that an intermediate member forming a rough surface is provided on the surface of the coil case. In the buried structure of the power supply device according to claim 1,
A power supply device characterized in that the intermediate member has thermal conductivity or heat capacity capable of blocking or delaying conduction of heat of the asphalt mixture between the intermediate member and the coil case during construction of the pavement. Buried structure. In the buried structure of the power supply device according to claim 1,
An embedded structure for a power supply device, wherein the intermediate member includes an air layer or a vacuum layer. The buried structure of the power supply device according to any one of claims 1 to 3,
A buried structure for a power supply device, wherein the pavement is a semi-flexible pavement. In the buried structure of the power supply device according to claim 4,
A buried structure for a power supply device, wherein the running path is a road. A method for burying a power supply device for constructing a power supply device embedding structure according to any one of claims 1 to 3, comprising:
A method for burying a power supply device, comprising: pouring the asphalt mixture and burying the coil case in the asphalt mixture. A method for burying a power supply device according to claim 6,
A method for burying a power supply device, characterized in that cement milk is infiltrated into the asphalt mixture in which the coil case is buried.

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