JP2013042616A - Non contact power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non contact power supply system which supplies power to a mobile object.SOLUTION: A non contact power supply system includes: a first power supply conductor linearly formed; and at least one power reception coil disposed so as to face the first power supply conductor. The power reception coil is formed into an annular shape having a first parallel part extending in parallel with the first power supply conductor and a connection part connecting both end parts of the parallel part with each other.

Description

  The present invention relates to a non-contact power feeding system.

  Various studies have been made on systems for supplying electric power in a non-contact manner, and practical applications are being promoted. For example, Patent Document 1 discloses a system that supplies power between coils.

JP 2010-259172 A

  However, since a system that supplies power between coils performs power supply in a state where the coils are opposed to each other, there is a problem that a position where power is supplied is limited. In addition, there is a problem that positioning between the coils is difficult because the axes of both coils need to coincide with each other. The present invention has been made to solve such a problem, and an object of the present invention is to provide a non-contact power feeding system that is easy to position without limiting the position where power feeding is performed.

  A non-contact power supply system according to the present invention includes a first power supply conductor formed in a linear shape, and at least one power reception coil arranged to face the power supply conductor, and the power reception coil includes: It is formed in an annular shape having a first parallel part extending in parallel with the first power supply conductor and a connecting part connecting both ends of the parallel part.

  According to this configuration, since the first parallel portion extending in parallel with the first power supply conductor is provided in the power receiving coil disposed so as to face the first power supply conductor formed in a linear shape, the first power supply conductor is provided. If a current is supplied to the power supply coil, power is supplied to the power receiving coil. In this way, since power can be supplied if the power receiving coil is provided with a portion parallel to the first power supply conductor, the power receiving coil can be disposed at any position along the first power supply conductor. Therefore, the position where power feeding is performed is not limited, and a system with a high degree of freedom can be constructed. In addition, since power can be supplied simply by placing the first parallel portion of the power receiving coil along the power supply conductor, positioning can be easily performed. In addition, the 1st electric power feeding conductor can be made into the form which made linear form, curve form, or these mixed.

  In the above power receiving coil, the arrangement of the connecting portion can be various. For example, if the connecting portion is arranged on a plane passing through the first feeding conductor and the first parallel portion, it is more effective. Power can be supplied.

  In addition, when the second parallel portion extending in parallel with the first power supply conductor is provided in the connecting portion, power can be supplied more effectively.

  In the above system, a first capacitor can be connected to the first power feeder. By providing such a capacitor, power factor correction is performed, and sufficiently necessary excitation can be performed even if the power supply connected to the first power supply conductor has a small capacity.

  In the above system, a load connected to the power receiving coil and a second capacitor connected to the load can be further provided. In this way, the voltage drop due to the leakage reactance of the power receiving coil becomes equal to the voltage drop of the capacitor, both voltage drops are offset, and most of the electromotive force induced in the power receiving coil is applied to the load.

  In the non-contact power supply system, the first power supply conductor, the first parallel portion, and the second parallel portion are on the same plane and extend in parallel with the first power supply conductor in a different direction from the first power supply conductor. A second feeding conductor formed in a linear shape through which a current flows can be further provided. If it does in this way, since the magnetic flux which links with a receiving coil by a 2nd electric power feeding conductor increases, a higher output can be obtained. In addition, the 2nd electric power feeding conductor can be made into the form which made linear form, curvilinear form, or these mixed together like the 1st electric power feeding conductor. However, it is necessary to arrange in parallel with the first feeding conductor.

  In the non-contact power feeding system, a plurality of power receiving coils can be provided. For example, a plurality of power receiving coils can be annularly arranged around the axis of the first power supply conductor.

  In the non-contact power feeding system, a guide member that moves the power receiving coil along the power feeding conductor can be provided. As described above, in the system of the present invention, the position where the power receiving coil is arranged is not limited, and therefore the power receiving coil can be moved along the power feeding conductor. Therefore, by providing the guide member as described above, power can be supplied while moving with the power receiving coil as a moving body.

  According to the non-contact power feeding system according to the present invention, the position where power feeding is performed is not limited, and positioning can be easily performed.

It is a top view of the non-contact electric supply system concerning this embodiment. It is sectional drawing of FIG. It is sectional drawing of FIG. It is sectional drawing which shows the other example of the non-contact electric power feeding system of FIG. It is the top view and sectional drawing which show the other example of the non-contact electric power feeding system of FIG. It is sectional drawing which shows the other example of the non-contact electric power feeding system of FIG. It is a top view which shows the other example of the non-contact electric power feeding system of FIG. It is a top view which shows the other example of the non-contact electric power feeding system of FIG.

  Hereinafter, an embodiment of a non-contact power feeding system according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a non-contact power feeding system according to this embodiment, and FIG. 2 is a cross-sectional view of FIG.

  As shown in FIGS. 1 and 2, the non-contact power feeding system includes a linear power feeding conductor 1 and a power receiving coil 2 adjacent to the linear power feeding conductor 1. The power supply conductor 1 is configured by bundling one or a plurality of conductive wires, and an AC power source 3 and a first capacitor for resonance 7 are connected in series. On the other hand, the power receiving coil 2 is arranged in parallel with the power supply conductor 1 and is composed of a rectangular frame 21 and a conductive wire 22 wound around the outer peripheral surface thereof. The frame 21 is formed in a rectangular shape in plan view, and is arranged so that the two long sides 21 a and 21 b are on the same plane as the power supply conductor 1. The frame 21 can be formed of a nonmagnetic material such as stainless steel, plastic, paper, or porcelain. The conducting wire 22 is wound around the frame 21 a plurality of times, and both ends thereof function as output conducting wires 221 and 222 extending from the frame 21 to the outside. A load 4 is connected in series to one of the output conductive wires 222, and a resonance second capacitor 6 is connected in series between the load 4 and the power receiving coil 2. In the present embodiment, the long side 22a close to the feeding conductor 1 in the conducting wire 22 of the power receiving coil 2 corresponds to the first parallel portion of the present invention, and the other portion corresponds to the connecting portion.

したがって、相互インダクタンスＭは、以下の式で表される。

但し、μ_０は、真空の透磁率＝４π×１０^−７［Ｈ／ｍ］ Next, the mechanism of the non-contact power feeding system configured as described above will be described. FIG. 3 is a cross-sectional view of FIG. When the power supply conductor 1 and the power receiving coil 2 are provided with the dimensions shown in FIG. 3 and the current I flows through the power supply conductor 1, the mutual inductance M of both is obtained by the following equation. That is, the magnetic flux Φ interlinking with the power receiving coil 2 having a rectangular shape in plan view is obtained by integrating the magnetic flux density B _x at a position away from the power supply conductor 1 by the distance _{x, and} thus the magnetic flux Φ is as follows.

Therefore, the mutual inductance M is expressed by the following equation.

However, μ ₀ is the vacuum permeability = 4π × 10 ⁻⁷ [H / m].

  From the above, it can be seen that the mutual inductance M is proportional to the length b where the feeding conductor 1 and the power receiving coil 2 face each other. Therefore, if the power receiving coil 2 manufactured to have a required facing length is used to obtain a required output, non-contact power feeding can be performed without using a conventional iron core.

  In addition, since the resonance capacitor 7 is connected in series to the power supply conductor 1, power factor correction is performed. That is, the excitation current that generates magnetic flux in the power supply conductor 1 is a delayed current having a phase difference of about 90 degrees with respect to the power supply voltage. Therefore, sufficient power excitation can be performed even with a small power supply capacity by performing power factor correction. Can be done. In the example shown in FIG. 1, the capacitor 7 is connected in series with the power supply 3 to cancel the voltage drop, but the capacitor 7 can be connected in parallel with the power supply 3, The current can be canceled out.

  On the other hand, when a current flows through the power receiving coil 2, a magnetic flux is generated, and this magnetic flux interlinks with the power receiving coil 2 itself to induce a voltage in the power receiving coil 2. Since this acts as a voltage drop, the voltage applied to the load 4 may be reduced. Further, when the magnetic coupling state between the feeding conductor 1 and the receiving coil 2 is extremely low, the leakage inductance of the receiving coil 2 is substantially equal to the self-inductance of the receiving coil 2. Therefore, as shown in FIG. 1, if a capacitor 6 is connected between the power receiving coil 2 and the load 4, and the voltage drop due to the leakage reactance of the power receiving coil 2 is equal to the voltage drop of the capacitor 6, both voltage drops are canceled out. Most of the electromotive force induced in the power receiving coil 2 is applied to the load 4.

  As described above, according to the present embodiment, the power receiving coil 2 disposed so as to face the power supply conductor 1 formed in a linear shape is provided with the portions 21 a and 21 b extending in parallel with the power supply conductor 1. If a current is supplied to the power supply conductor 1, power is supplied to the power receiving coil 2. As described above, since power can be supplied if the power receiving coil 2 is provided with a portion parallel to the power feeding conductor 1, the power receiving coil 2 can be disposed at any position along the first power feeding conductor 1. . Therefore, since the position where power feeding is performed is not limited, a system with a high degree of freedom can be developed. Further, since power can be supplied simply by placing the first parallel portion 22a of the power receiving coil 2 along the power supply conductor 1, positioning can be easily performed. Therefore, for example, the power receiving coil 2 can be moved with respect to the power supply conductor 1. Alternatively, if the power feeding conductor 1 is embedded in a floor or wall, power can be received by bringing the power receiving coil 2 into contact with the floor or wall.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning. For example, in the above embodiment, one power receiving coil 2 is used, but a plurality of power receiving coils 2 can be used. For example, as shown in FIG. 4, the power receiving coil 2 can be arranged around the axis of the power supply conductor 1 as described above. That is, since the magnetic flux Φ is generated around the axis line from the power supply conductor 1, if the magnetic flux Φ is arranged so as to be linked to the power receiving coil 2, power can be supplied even if a plurality of power receiving coils 2 are disposed. It becomes possible.

  In addition, as shown in FIG. 5, two power supply conductors extending in parallel to each other can be disposed, and a power receiving coil can be disposed therebetween. Here, for convenience of explanation, the feeding conductor denoted by reference numeral 1 is referred to as a first feeding conductor, and the feeding conductor denoted by reference numeral 5 is referred to as a second feeding conductor. Both feed conductors 1 and 5 are made of the same material. However, the directions of current flow are opposite to each other. The power receiving coil 2 has two long sides (first parallel portion and second parallel portion) 21a and 21b on a plane passing through both the power feeding conductors 1 and 5. With such a configuration, since the magnetic flux from the two power supply conductors 1 and 5 is linked to the power receiving coil 1, a higher output can be obtained. Although illustration is omitted, a power source and a capacitor are also connected to the second feeding conductor 5.

  Further, when the power receiving coil 2 is rectangular, both long sides 21a and 21b may not be arranged on the same plane as the power feeding conductor 1, and both long sides 21a and 21b are arranged on the power feeding conductor 1 as shown in FIG. As long as it is parallel. The power receiving coil 2 may have a shape other than the above embodiment. For example, the power receiving coil 2 can be a rectangle or a square whose short side is parallel to the power supply conductor 1 in plan view. Further, as shown in FIG. 7, a linear parallel portion 25 is provided in a portion close to the power supply conductor 1, and curved connecting portions 26 are provided at both ends of the parallel portion 25, so that the whole is formed in an annular shape. You can also.

  Further, as shown in FIG. 8, a guide rail 9 can be provided so that the power receiving coil 2 can move in parallel with the power feeding conductor 1. In this example, a pair of guide rails 9 are provided in parallel with the power supply conductor 1, and the power receiving coil is movably disposed on the guide rails 9. For example, the power receiving coil 2 can be self-propelled on the guide rail 9 by power feeding from the power feeding conductor 1. There are various types of guide rails, and the guide rail is not particularly limited as long as the power receiving coil 2 can move in parallel with the power supply conductor 1.

  Examples of the present invention will be described below. However, the present invention is not limited to the following examples.

Here, the non-contact power feeding system shown in FIG. 1 was produced as Example 1, and the non-contact power feeding system shown in FIG. As a reference example, a non-contact power supply system using two circular coils was also produced. The specifications of each member are as follows.
- feeding conductor: IV line, the power receiving coil of the cross-sectional area 2 mm ^2: winding a conductor of the rectangular frame of a non-magnetic material (litz wire 0.12φ100C), was prepared a rectangular coil of 310 × 150 mm. The number of turns is 34 turns. The inductance is 0.68 mH.
-Circular coil: It is a circle with a diameter of 300 mm, and the number of turns is 33 turns.
・ Power supply voltage: 200V
・ Load resistance: 11.85Ω
・ Capacitor: 0.28μF

In the non-contact power feeding system as described above, the input / output ratio was measured while changing the distance between the power receiving coil and the power feeding conductor. The results are as follows.

As described above, Examples 1 and 2 have a low input / output ratio compared to the reference example using a circular coil, but it can be understood that a necessary output can be obtained. In particular, when the distance between the power supply conductor and the power receiving coil is reduced, the input / output ratio is increased, and in the case where the distance is 50 mm, Example 2 exceeds the reference example.

Further, in Examples 1 and 2, when the power receiving coil was moved along the feeding conductor at a speed of 1 m / s, there was no change at all when stationary and an equivalent input / output ratio could be obtained.

1 Feeding conductor (first feeding conductor)
2 Power-receiving coil 5 Second feeding conductor 6 Second capacitor 7 First capacitor 9 Guide member

Claims (7)

A first feeding conductor formed in a linear shape;
And at least one power receiving coil disposed to face the first power supply conductor,
The power receiving coil is a non-contact power feeding system formed in an annular shape having a first parallel part extending in parallel with the first power feeding conductor and a connecting part connecting both ends of the parallel part.   The contactless power feeding system according to claim 1, wherein a first capacitor is connected to the first power feeding body. A load connected to the power receiving coil;
The wireless power supply system according to claim 1, further comprising a second capacitor connected to the load.   The non-contact electric power feeding system in any one of Claim 1 to 3 with which the 2nd parallel part extended in parallel with the said 1st electric power feeding conductor is provided in the said connection part.   The first power supply conductor, the first parallel portion, and the second parallel portion are coplanar and extend in parallel with the first power supply conductor, and a linear current flows in a different direction from the first power supply conductor. The non-contact power feeding system according to claim 4, further comprising a second power feeding conductor formed on.   The non-contact electric power feeding system in any one of Claim 1 to 5 with which the said receiving coil is provided with two or more. The non-contact electric power feeding system in any one of Claim 1 to 6 further equipped with the guide member which moves the said receiving coil along the said 1st electric power feeding conductor.

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