Parallel two-wire unit

Abstract

To provide a parallel two-wire unit that can reduce the number of components.SOLUTION: A parallel two-wire unit 1 according to the present disclosure for contactless power supply to a receiving device (coil 53) includes: a mattress 21; and a parallel two-line 31 composed of two conductors 311 extending parallel to each other. Therein, the parallel two-lines 31 are embedded in the mattress 21 so as to be parallel to one surface of the mattress 21. Since the parallel two-lines 31 can be protected without covering the parallel two-lines 31 with a separate cover, the cover can be eliminated and the number of components can be reduced.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a parallel twin-wire unit. [Background technology]

[0002] Conventionally, contactless power supply systems have been proposed that supply power to mobile objects such as AGVs (Automated Guided Vehicles) or electric vehicles in a contactless manner. The contactless power supply system described in Patent Document 1 includes a parallel two-wire unit on the power transmission side and a power receiving device on the power receiving side. The parallel two-wire unit is installed on the travel path of the mobile object, and the power receiving device is mounted on the mobile object. The parallel two-wire unit includes two parallel lines that are composed of two conductors extending parallel to each other, and a high-frequency current is supplied to the parallel two lines. The parallel two lines and a coil included in the power receiving device are magnetically coupled to each other, thereby supplying a high-frequency current to the coil in a contactless manner.

[0003] The parallel two-wire unit is equipped with a guide plate. Two parallel groove-like cavities are provided on one side of the guide plate, and the two conductors are housed in the two cavities. As a result, the distance between the two conductors can be kept constant, improving power supply efficiency. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-087970 Summary of the Invention [Problem to be solved by the invention]

[0005] The parallel twin-wire unit described in Patent Document 1 includes a cover separate from the guide plate. The cover covers the parallel twin wires together with the guide plate from above, protecting the parallel twin wires. However, from the perspective of reducing the number of parts, it is desirable to eliminate the cover.

[0006] An object of the present disclosure is to provide a parallel twin-wire unit that can reduce the number of parts. [Means for solving the problem]

[0007] The parallel two-wire unit of the present disclosure is a parallel two-wire unit for contactlessly supplying power to a power receiving device, and is characterized in that it comprises a mat and a parallel two-wire line composed of two conductors extending parallel to each other, and the parallel two-wire line is embedded inside the mat so that it is parallel to one surface of the mat. The parallel two-wire unit of the present disclosure is a parallel two-wire unit for contactlessly supplying power to a power receiving device, and comprises a plate-shaped mat extending in the movement direction of the power receiving device, and a parallel two-wire line composed of two conductors extending in the movement direction and parallel to each other, the parallel two-wire line being embedded inside the mat so as to be parallel to one surface of the mat, one ends of the two conductors being connected inside the mat by conductors that are continuous with each of the two conductors, and a connector is provided on the outer edge of the mat along the movement direction for electrically connecting to the other end of each of the two conductors, and the connector and the other end of each of the two conductors are connected inside the mat by conductors that are continuous with the other end and extend in a direction intersecting the movement direction.

[0008] In the present disclosure, two parallel lines are embedded inside the mat so that they are parallel to one surface of the mat. Therefore, the distance between the two conductors that make up the two parallel lines can be kept constant. Also, when the mat is laid on the floor or ground with the other side facing downward, the distance between the two parallel lines and a moving object traveling on one side of the mat can be kept constant. As a result, the power supply efficiency can be improved. Furthermore, since the two parallel lines can be protected without having to be covered with a separate cover, the cover can be eliminated and the number of parts can be reduced.

[0009] The parallel two-wire unit of the present disclosure is characterized in that one ends of the two conductors are connected inside the mat by conductors continuous with each of the two conductors, and connectors are provided on the outer edge of the mat for electrically connecting to the other ends of each of the two conductors.

[0010] In the present disclosure, conductors continuous with each of the two conductors connect one end of each of the two conductors inside the mat. Therefore, for example, by using one end and the other end of a single cable as one end and the other end of the two conductors and using the middle of the cable as a connecting line that connects the one ends of the two conductors, it is possible to easily configure two parallel lines. Connectors for electrically connecting the other ends of the two conductors are provided on the outer edge of the mat, which prevents the wheels of a moving object traveling on one surface of the mat from hitting the convex connectors or falling into the concave connectors, causing the moving object to vibrate.

[0011] The parallel two-wire unit according to the present disclosure is characterized in that the mat in which the parallel two wires are embedded can be wound into a roll.

[0012] In the present disclosure, the mat can be rolled up together with the parallel twin wires inside, which makes it convenient to transport or store the parallel twin wire unit when not in use.

[0013] The parallel two-wire unit according to the present disclosure is characterized in that the two conductors have linear, arc-shaped, or L-shaped portions.

[0014] In the present disclosure, a mat with two parallel wires having a straight portion embedded therein can be laid on a straight path of a moving body. Also, a mat with two parallel wires having an arc-shaped portion embedded therein can be laid on a curved path of a moving body. Furthermore, a mat with two parallel wires having an arc-shaped or L-shaped portion embedded therein can be laid on a corner path connecting two straight paths extending in intersecting directions. As a result, contactless power supply using a two-parallel wire unit can be performed regardless of the shape of the traveling path.

[0015] The parallel twin-wire unit according to the present disclosure is characterized in that it includes a plurality of the parallel twin-wire lines, and the plurality of the parallel twin-wire lines are connected in parallel or in series to each other outside the mat.

[0016] In the present disclosure, a plurality of parallel twin lines are provided, and the parallel twin lines are connected in parallel or in series outside the mat, so that the parallel connection and the series connection can be selectively switched according to the required specifications. [Effects of the Invention]

[0017] According to the parallel twin-wire unit of the present disclosure, the number of parts can be reduced. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a schematic plan view of the parallel twin-wire unit according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 10 is a cross-sectional view of the mat in a rolled-up state. [Figure 5] FIG. 10 is a schematic plan view of a plurality of parallel twin-wire units according to a second embodiment. [Figure 6] FIG. 11 is a schematic plan view of a two-parallel wire unit according to a third embodiment. [Figure 7] FIG. 10 is a schematic diagram illustrating a connection between two parallel lines. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present disclosure will be described.

[0020] Embodiment 1. FIG. 1 is a schematic plan view of a parallel twin-wire unit according to the first embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. In the figure, reference numeral 1 denotes a parallel twin-wire unit, and the parallel twin-wire unit 1 includes a mat 21 and a parallel twin-wire 31. The mat 21 is insulating and made of, for example, synthetic rubber or synthetic resin. The mat 21 is heat-resistant and durable, and can withstand heat generated by the two parallel lines 31 and the connecting lines 32 and power supply lines 33 (described later), as well as the movement of the moving object 6 (described later).

[0021] The mat 21 is in the form of a strip and is flexible enough to be wound up in a roll in the longitudinal direction. Hereinafter, the longitudinal direction of the mat 21 will be referred to as the front-rear direction, and the lateral direction will be referred to as the left-right direction. One surface of the mat 21 is flat and has a small coefficient of friction. The other surface of the mat 21 has small irregularities and has a large coefficient of friction. The mat 21 is placed on the floor surface 4 with the surface with the large coefficient of friction facing downward. The upper and lower surfaces of the mat 21 are parallel to each other.

[0022] FIG. 3 is a cross-sectional view taken along line III-III in FIG. As shown in FIGS. 1 to 3, the parallel twin line 31 is composed of two conductors 311 extending parallel to each other. The two conductors 311 are insulated from each other by the mat 21. Each conductor 311 extends linearly in the front-to-rear direction and is embedded inside the mat 21 so as to be parallel to the upper surface of the mat 21. For example, the conductor 311 is a flat braided copper wire, and is arranged so that one surface is parallel to the upper surface of the mat 21. The conductor 311 is not limited to a flat braided copper wire, but it is preferably a flat braided wire in order to reduce the thickness of the mat 21. The position where the parallel twin lines 31 are buried is indicated on the upper surface of the mat 21, so that it is desirable that the position where the parallel twin lines 31 are buried can be visually confirmed.

[0023] As shown in FIG. 1, one end of each of the two conductors 311 in the front-to-rear direction (the left ends when facing FIG. 1) is connected to each other by a connecting wire 32 (conductor). The connecting wire 32 extends linearly in the left-to-right direction and is embedded inside the mat 21 so as to be parallel to the upper surface of the mat 21. One end of the connecting wire 32 is continuous with one of the connecting wires 32, and the other end of the connecting wire 32 is continuous with the other connecting wire 32. The connecting wire 32 in this embodiment is made of the same flat braided copper wire as the conductors 311.

[0024] The other end (the right end as viewed in FIG. 1) of each conductor 311 is connected to one end of a power feeder 33. The power feeder 33 extends linearly in the left-right direction and is embedded inside the mat 21 so as to be parallel to the upper surface of the mat 21. The power feeder 33 in this embodiment is made of the same flat braided copper wire as the conductors 311. The two parallel lines 31, the connecting line 32, and the two power feed lines 33 are formed by bending a single flat braided copper wire. Alternatively, the two parallel lines 31, the connecting line 32, and the two power feed lines 33 may be formed by connecting separate flat braided copper wires to each other.

[0025] As shown in Figures 1 and 3, a male connector 34 is provided on the outer edge of the mat 21. The connector 34 protrudes leftward from the left end face of the mat 21 (or rightward from the right end face). The connector 34 has two built-in connection pins 341. The two connection pins 341 correspond one-to-one to the two conductors 311. The other end of the power supply line 33 is connected to the connection pin 341.

[0026] 1, a female connector (not shown) of the power transmission unit 51 is detachably connected to the connector 34. The power transmission unit 51 includes a power supply unit 511. The power supply unit 511 converts current supplied from, for example, a commercial power supply (not shown) into high-frequency current and supplies the high-frequency current to the two parallel lines 31 via the connector 34 and the power feeder 33. The power transmission unit 51 includes a capacitor (not shown) that forms a resonant circuit together with the two parallel lines 31. If the power transmission unit 51 does not include a capacitor, a capacitor may be connected to the two conductors 311 instead of the connection line 32, but it is desirable that the power transmission unit 51 include a capacitor in order to reduce the thickness of the mat 21.

[0027] 2 and 3, it is desirable that a magnetic layer 22 be embedded in the bottom surface of the mat 21. The magnetic layer 22 covers the two parallel lines 31, the connection line 32, and the two power feed lines 33 from below in a non-contact manner, and is, for example, a ferrite sheet. Note that the magnetic layer 22 is not limited to a ferrite sheet, and is not limited to a configuration in which it is embedded in the mat 21. For example, the magnetic layer 22 may be formed by applying ferrite powder to the underside of the mat 21. If the mat 21 does not have a magnetic layer 22, it is desirable to provide a magnetic layer 22 separate from the parallel two-wire unit 1 between the mat 21 and the floor surface 4 (for example, by laying a ferrite sheet on the floor surface 4 and then laying the mat 21 on top of it).

[0028] As shown in Figures 1 and 2, slope members 23 are adjacent to the front and rear ends of the mat 21. The slope member 23 is a mat that has a right-angled triangular shape when viewed from the side. The slope member 23 is placed on the floor surface 4 so that the sloped surface 23a corresponding to the hypotenuse of the right triangle faces upward, one surface 23b corresponding to the long side of the right triangle faces downward, and the other surface corresponding to the short side of the right triangle contacts the front end surface (or rear end surface) of the mat 21. The sloped surface 23a connects the floor surface 4 and the upper surface of the mat 21. Like the upper surface of the mat 21, the sloped surface 23a has a small coefficient of friction. Like the lower surface of the mat 21, the one surface 23b has a large coefficient of friction.

[0029] The parallel two-wire unit 1 constitutes a contactless power supply system that contactlessly supplies power to a moving object 6. The contactless power supply system of this embodiment includes the parallel two-wire unit 1, a power transmitting unit 51, a power receiving unit 52, and a coil 53. The moving body 6 is an AGV equipped with four wheels 61, a battery 62, and a motor 63. Of the four wheels 61, two are front wheels and the remaining two are rear wheels. The battery 62 supplies power to the motor 63. The powered motor 63 drives the drive wheels. For example, the front wheels are used as steering wheels and the rear wheels are used as drive wheels, causing the moving body 6 to travel along a predetermined travel route.

[0030] The parallel two-wire unit 1 is laid midway along the travel path of the moving body 6, with the longitudinal direction of the mat 21 aligned with the travel path of the moving body 6. The moving body 6 traveling along the travel path is guided from the floor surface 4 by the inclined surface 23a of one slope member 23 and rises to the upper surface of the mat 21. Furthermore, the moving body 6 travels on the upper surface of the mat 21 from one slope member 23 to the other slope member 23, and then descends from the upper surface of the mat 21 to the floor surface 4 by being guided by the inclined surface 23a of the other slope member 23.

[0031] By bringing the adjacent mats 21 and slope members 23 into close contact with each other, it is possible to prevent the moving body 6 from vibrating when crossing the boundary between them. In order to bring the mats 21 and slope members 23 into close contact with each other, for example, the front and rear end faces of the mat 21 and the other face of each slope member 23 are provided with irregularities that can be detachably fitted together.

[0032] The coefficients of friction of the upper surface of the mat 21 and the sloped surface 23a of the slope member 23 are small, so vibration of the moving object 6 traveling on them can be prevented. The coefficients of friction of the lower surface of the mat 21 and the first surface 23b of the slope member 23 are large, so displacement of these components can be suppressed by friction with the floor surface 4. On the other hand, since neither the mat 21 nor the slope member 23 is completely fixed to the floor surface 4, they can be easily repositioned when the travel route is changed. Note that instead of providing irregularities on the lower surface of the mat 21 or the first surface 23b of the slope member 23, a separate anti-slip member may be attached.

[0033] The distance between the two conductors 311 that make up the twin parallel lines 31 is approximately the same as the distance between the wheels 61 of the moving body 6 in the left-right direction. The power receiving unit 52 and the coil 53 constitute a power receiving device and are mounted on the mobile object 6. The power receiving unit 52 includes a capacitor (not shown) that, together with the coil 53, constitutes a resonant circuit. The resonant frequency of the resonant circuit on the power receiving side and the resonant frequency of the resonant circuit on the power transmitting side are equal to each other. The coil 53 is disposed on the underside of the body of the mobile object 6. When the left and right wheels 61 are located directly above the two conductors 311, both the left and right sides of the coil 53 are located directly above the two conductors 311.

[0034] A high-frequency current is supplied to the two parallel lines 31 from the power transmitting unit 51. When the moving object 6 is located on the upper surface of the mat 21, the two parallel lines 31 and the coil 53 are magnetically coupled to each other, thereby supplying the high-frequency current to the coil 53 in a contactless manner. This type of contactless power supply can be performed even when the moving object 6 is traveling on the upper surface of the mat 21. The power receiving unit 52 converts the high-frequency current received by the coil 53 in a contactless manner into a direct current of a predetermined voltage and charges the battery 62.

[0035] According to the parallel twin-wire unit 1 described above, the parallel twin wires 31 are embedded inside the mat 21, so the left-right spacing between the two conductors 311 that make up the parallel twin wires 31 can be kept constant. Also, the distance between the parallel twin wires 31 and the coil 53 of the moving object 6 traveling on the upper surface of the mat 21 can be kept constant. As a result of the above, the power supply efficiency can be improved. Furthermore, the parallel twin wires 31 can be protected without covering them with a separate cover, so the cover can be eliminated and the number of parts can be reduced.

[0036] Because the magnetic layer 22 covers the two parallel lines 31 from below, the magnetic field generated around the two parallel lines 31 can be prevented from spreading below the magnetic layer 22. This further improves power supply efficiency. Furthermore, when the two parallel lines 31 are installed on the ground instead of on the floor 4, even if metal objects are buried underground, there is no risk that the power supply from the two parallel lines 31 to the coil 53 will be adversely affected by the metal objects underground. A shielding layer (not shown), made of, for example, an aluminum sheet, may cover the magnetic layer 22 from below. In this case, the magnetic field generated around the two parallel lines 31 can be prevented from spreading below the magnetic layer 22.

[0037] Connectors 34 for electrically connecting to the other ends of the two conductors 311 are provided on the outer edge (specifically, the end face) of the mat 21. This prevents the wheels 61 of the moving object 6 running on the upper surface of the mat 21 from coming into contact with the connectors 34, which can cause the moving object 6 to vibrate.

[0038] The magnetic layer 22, the parallel twin-wire unit 31, the connecting wire 32, and the power supply wire 33 are flexible enough to be wound up in a roll in the longitudinal direction of the mat 21. In other words, the mat 21 can be wound up in a roll together with the components contained therein. This makes it convenient to transport or store the parallel twin-wire unit 1 when not in use.

[0039] FIG. 4 is a cross-sectional view of the mat 21 in a rolled-up state. The parallel two-wire unit 1 is transported or stored in a state where the power transmission unit 51 is not connected to the connector 34. To transport or store the parallel two-wire unit 1 compactly, the worker rolls up the mat 21. When the slope member 23 is integrally provided on the mat 21, it is desirable that the slope member 23 also has flexibility that allows it to be wound up in a roll.

[0040] The separation distance between the two conductors 311 may be longer or shorter than the lateral separation distance between the wheels 61. Experience has shown that the longer the separation distance between the two conductors 311, the stronger the magnetic field generated around the two parallel lines 31, and the longer the power transmission distance from the two parallel lines 31. Therefore, by increasing the separation distance between the two conductors 311, the height of the coil 53 from the floor surface 4 or the upper surface of the mat 21 can be increased. In other words, the degree of freedom in arranging the coil 53 can be improved.

[0041] The parallel two-wire unit 1 may be fixed to the floor surface 4. When the parallel two-wire unit 1 is fixed to the floor surface 4, the mat 21, the magnetic layer 22, the parallel two-wire line 31, the connecting line 32, and the power supply line 33 do not need to be flexible enough to be wound into a roll. The upper surface of the mat 21 may be inclined relative to the lower surface, in which case the moving body 6 which moves in the front-rear direction can also be moved in the up-down direction. The moving body 6 is not limited to an AGV, but may be, for example, an electric vehicle. The parallel two-wire unit 1 may be laid over the entire length of the travel route of the moving object 6. In this case, power can be constantly supplied to the coil 53 of the moving object 6, so that the battery 62 of the moving object 6 can be omitted or made smaller.

[0042] Next, embodiments 2 and 3 will be described. The parallel twin line unit 1 of embodiments 2 and 3 has substantially the same configuration as the parallel twin line unit 1 of embodiment 1, with some exceptions, and therefore achieves substantially the same effects as those of embodiment 1. Below, differences from embodiment 1 will be described, and other components that are the same as those of embodiment 1 will be assigned the same reference numerals and their description will be omitted.

[0043] Embodiment 2. 5 is a schematic plan view of a plurality of parallel two-wire units 1 according to embodiment 2. Connectors 34 are not shown in FIG.

[0044] In the parallel two-wire unit 1 of the first embodiment, the conductors 311 constituting the parallel two-wire line 31 are linear. Fig. 5A shows a combination of a parallel two-wire unit 1 including a linear parallel two-wire line 31 made up of linear conductors 311, and a parallel two-wire unit 1 including an L-shaped parallel two-wire line 31 made up of L-shaped conductors 311. The L-shaped conductor 311 has an integral portion that extends linearly in the front-to-rear direction and a portion that extends linearly in the left-to-right direction. On the other hand, FIG. 5B shows a combination of a parallel twin-wire unit 1 having a linear parallel twin-wire line 31 made up of linear conductors 311 and a parallel twin-wire unit 1 having an arc-shaped parallel twin-wire line 31 made up of arc-shaped (more specifically, quarter-circular arc-shaped) conductors 311.

[0045] With the parallel two-wire unit 1 as described above, a mat 21 with two straight parallel wires 31 buried therein can be laid on a straight path of the moving body 6. Also, a mat 21 with two arc-shaped parallel wires 31 buried therein can be laid on a curved path of the moving body 6. Furthermore, a mat 21 with two arc-shaped or L-shaped parallel wires 31 buried therein can be laid on a corner path connecting straight paths extending in mutually perpendicular directions. As a result, contactless power supply using the parallel two-wire unit 1 can be performed regardless of the shape of the travel path. The shape of the conductor 311 is not limited to a straight line, an L-shape, or an arc shape, but may be a V-shape, a U-shape, or the like.

[0046] By laying multiple adjacent parallel two-wire units 1 along the entire length of the travel route, the coil 53 of the moving body 6 can be constantly supplied with power, making it possible to omit or miniaturize the battery 62 of the moving body 6. The position or shape of the parallel twin lines 31 is indicated on the upper surface of the mat 21, and it is desirable that the position or shape of the parallel twin lines 31 can be visually confirmed. The shape of the parallel twin lines 31 may be displayed on the end faces of the parallel twin lines 31. In this case, different types of parallel twin line units 1 can be easily distinguished visually even when the mat 21 is wound into a roll.

[0047] To prevent adjacent parallel two-wire units 1 from shifting or separating, for example, the mats 21 of each parallel two-wire unit 1 are configured as joint mats. At least one of the four sides of the mat 21, located upstream of the travel path and the other side located downstream, are provided with joint sections with corresponding concave and convex portions. The concave and convex portions of the joint sections may be semi-oval, trapezoidal, oval, or other shapes. By engaging the downstream joint section of the mat 21 of one parallel two-wire unit 1 with the upstream joint section of the mat 21 of another parallel two-wire unit 1, the adjacent mats 21 can be tightly secured to each other. The tight contact between the adjacent mats 21 prevents vibration of the moving object 6 when crossing the boundary between them.

[0048] Embodiment 3. FIG. 6 is a schematic plan view of the parallel twin-wire unit 1 according to the third embodiment. The parallel twin-wire unit 1 of the first embodiment includes one parallel twin-wire line 31. The parallel twin-wire unit 1 of the present embodiment includes two parallel twin-wire lines 31. The four conductors 311 are parallel to one another. Two conductors 311 constituting one pair of parallel lines 31 are arranged between two conductors 311 constituting the other pair of parallel lines 31. The connector 34 incorporates four connection pins 341 corresponding to the four conductors 311 .

[0049] Hereinafter, one of the two conductors 311 constituting each parallel twin line 31 will be referred to as the first conductor 311 and the other as the second conductor 311. The first (second) conductor 311 of the outer parallel twin line 31 is adjacent to the outside of the first (second) conductor 311 of the inner parallel twin line 31.

[0050] FIG. 7 is a schematic diagram illustrating the connection between the two parallel lines 31. Both the power transmission unit 51 shown in Fig. 7A and the power transmission unit 51 shown in Fig. 7B are detachably connected to the connector 34 provided on the parallel two-wire unit 1 (see Fig. 6). The power supply section 511 of the power transmission unit 51 is provided with two connection terminals 512, 513. One of the connection terminals 512, 513 is a ground terminal, and the other is a voltage terminal.

[0051] In the power transmission unit 51 shown in Fig. 7A, the first conductor 311 of the outer parallel twin line 31 is connected to the connection terminal 512 of the power supply unit 511 via the power feed line 33 and the connection pin 341. The second conductor 311 of the inner parallel twin line 31 is connected to the connection terminal 513 of the power supply unit 511 via the power feed line 33 and the connection pin 341. The second conductor 311 of the outer parallel twin line 31 and the first conductor 311 of the inner parallel twin line 31 are electrically connected inside the power transmission unit 51 via the power feed line 33 and the connection pin 341. In other words, the two parallel twin lines 31 shown in Fig. 7A are connected in series to each other.

[0052] In the power transmission unit 51 shown in Fig. 7B, the first conductor 311 of the outer parallel twin line 31 and the first conductor 311 of the inner parallel twin line 31 are connected to a connection terminal 512 of the power supply unit 511 via a feeder line 33 and a connection pin 341. The second conductor 311 of the outer parallel twin line 31 and the second conductor 311 of the inner parallel twin line 31 are connected to a connection terminal 513 of the power supply unit 511 via a feeder line 33 and a connection pin 341. In other words, the two parallel twin lines 31 shown in Fig. 7B are connected in parallel to each other.

[0053] Of the two parallel two-wire units 1 with a common configuration, one is connected to the power transmission unit 51 shown in Fig. 7A and the other is connected to the power transmission unit 51 shown in Fig. 7B. This allows the two parallel two-wire lines 31 of one parallel two-wire unit 1 to be connected in series, and the two parallel two-wire lines 31 of the other parallel two-wire unit 1 to be connected in parallel. By exchanging the power transmission unit 51 shown in FIG. 7A with the power transmission unit 51 shown in FIG. 7B, the two parallel two-wire lines 31 included in the same parallel two-wire unit 1 can be connected in series or in parallel.

[0054] In this embodiment, the parallel two-wire unit 1 may have N parallel two-wire lines 31 (N is a natural number greater than or equal to 2). When the parallel two-wire unit 1 has three parallel two-wire lines 31, the third parallel two-wire line 31 is arranged further inside the inner parallel two-wire line 31 (or further outside the outer parallel two-wire line 31) in the parallel two-wire unit 1 shown in FIG. 6. Since there are three sets of six conductors 311 inside the mat 21, the connector 34 has six built-in connection pins 341. The shape of each parallel two-wire line 31 is not limited to being linear, and may be L-shaped, arc-shaped, or the like.

[0055] The N parallel lines 31 connected in series behave like a coil with N turns. This strengthens the magnetic field generated around the parallel lines 31, improving the magnetic coupling between the N parallel lines 31 and the coil 53. This improves the efficiency of power transmission to the coil 53 and extends the power transmission distance from the parallel lines 31.

[0056] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is intended to include not only the above-mentioned meaning but also the meaning equivalent to the claims and all modifications within the scope of the claims. The constituent elements (technical features) disclosed in each embodiment can be combined with each other, and new technical features can be formed by the combination. [Explanation of symbols]

[0057] 1 parallel two-wire unit; 21 mat; 31 parallel two-wire line; 311 conductor; 32 connecting wire (conductor); 34 connector; 52 power receiving unit (power receiving device); 53 coil (power receiving device)

Claims

1. A parallel two-wire unit for contactlessly supplying power to a power receiving device, a plate-shaped mat extending in a moving direction of the power receiving device; a pair of parallel lines formed of two conductors extending in the moving direction and parallel to each other; Equipped with The two parallel lines are embedded inside the mat so as to be parallel to one surface of the mat, one ends of the two conductors are connected to each other inside the mat by conductors continuous with each of the two conductors, a connector for electrically connecting to the other end of each of the two conductors is provided on an outer edge of the mat along the moving direction; A parallel two-wire unit characterized in that the connector and the other end of each of the two conductors are connected inside the mat by a conductor that is continuous with the other end and extends in a direction intersecting the movement direction.

2. 2. The parallel twin-wire unit according to claim 1, wherein the mat in which the parallel twin-wire lines are embedded can be wound into a roll.

3. 3. The parallel two-wire unit according to claim 1, wherein the two conductors have linear, arcuate or L-shaped portions.

4. a plurality of the parallel twin lines; 4. The parallel twin-wire unit according to claim 1, wherein a plurality of the parallel twin-wire lines are connected in parallel or in series to each other outside the mat.

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