Wireless power transmission device

Abstract

To provide a wireless power transmission device capable of suppressing reduction in coupling coefficients of a power transmission coil and a power reception coil (a coupling coefficient between power transmission and reception coils).SOLUTION: A wireless power transmission device comprises: a first power transmission coil 110 including a portion 111 of a first conductor width W1 and a portion 112 of a second conductor width W1', the power transmission coil being for transmitting power to a power reception coil; and a second power transmission coil 120 including a portion 121 of a third conductor width W2 and a portion 122 of a fourth conductor width W2', the power transmission coil being for transmitting power to the power reception coil. In the first power transmission coil 110 and the second power transmission coil 120, the portion 112 of the second conductor width W1' and the portion 122 of the fourth conductor width W2' are adjacent by a predetermined separation distance D. A sum of the second conductor width W1' and the fourth conductor width W2' is smaller than a sum of the first conductor width W1 and the third conductor width W2, and the predetermined separation D is equal to or less than smaller one of the second conductor width W1' and the fourth conductor width W2'.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a wireless power transmitting device. [Background technology]

[0002] In recent years, wireless power supply has become widespread as a means of supplying power to moving bodies such as electric vehicles and unmanned guided vehicles in factories. In this case, a power receiving coil installed in a moving body moves parallel to a power transmitting coil installed along the moving path of the moving body, and is wirelessly supplied with power from the power transmitting coil. On the other hand, a power transmitting coil may be divided into multiple parts for ease of installation and manufacturing. In this case, the longer the separation distance between two adjacent power transmitting coils, the lower the coupling coefficient between the power transmitting coil and the power receiving coil (coupling coefficient between the transmitting and receiving coils). This reduction in the coupling coefficient may lead to a reduction in the received power of the moving body, and the moving body may not be able to operate normally. In consideration of this point, in Patent Document 1, two adjacent power supply coils (power transmitting coils) are installed with their ends in the moving direction of the moving body overlapping one above the other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-220268 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the height of the power transmitting coil, which is the length of the power transmitting coil in the power feeding direction, is greater than the separation distance in the power feeding direction between the power transmitting coil and the power receiving coil, it is difficult to vertically overlap the ends of two adjacent power transmitting coils as described in Patent Document 1. In this case, there is a problem that the coupling coefficient between the power transmitting coil and the power receiving coil (coupling coefficient between the power transmitting and receiving coils) decreases.

[0005] The present disclosure has been made in consideration of such problems, and has an object to provide a wireless power transmitting device that can suppress a decrease in the coupling coefficient between a power transmitting coil and a power receiving coil (the coupling coefficient between the power transmitting and receiving coils). [Means for solving the problem]

[0006] The wireless power transmission device disclosed herein includes a first power transmission coil for transmitting power to a receiving coil, the first power transmission coil having a portion of a first conductor width and a portion of a second conductor width, and a second power transmission coil for transmitting power to the receiving coil, the second power transmission coil having a portion of a third conductor width and a portion of a fourth conductor width, the first power transmission coil and the second power transmission coil having a predetermined separation distance between the portion of the second conductor width and the portion of the fourth conductor width adjacent to each other, the sum of the second conductor width and the fourth conductor width being smaller than the sum of the first conductor width and the third conductor width, and the predetermined separation distance being equal to or smaller than the smaller conductor width of the second conductor width and the fourth conductor width. In addition, the wireless power transmission device of the present disclosure includes a first power transmission coil for transmitting power to a receiving coil, the first power transmission coil having a portion of a first conductor width and a portion of a second conductor width, and a second power transmission coil for transmitting power to the receiving coil, the second power transmission coil having a portion of a third conductor width and a portion of a fourth conductor width, wherein the first power transmission coil and the second power transmission coil have a predetermined overlapping section, the portion of the second conductor width and the portion of the fourth conductor width are adjacent to each other, and a difference between the sum of the second conductor width and the fourth conductor width and the predetermined overlapping section is smaller than the sum of the first conductor width and the third conductor width. Effect of the Invention

[0007] According to the present disclosure, it is possible to suppress a decrease in the coupling coefficient between a power transmitting coil and a power receiving coil (the coupling coefficient between the power transmitting and receiving coils). [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating an example of a schematic configuration of a wireless power supply system according to a first embodiment of the present disclosure. [Diagram 2] FIG. 2 illustrates the first embodiment of the present disclosure and is a diagram showing a first example of a schematic configuration of a first power transmitting coil and a second power transmitting coil which are two adjacent power transmitting coils illustrated in FIG. [Diagram 3] FIG. 2 illustrates the first embodiment of the present disclosure and is a diagram showing a second example of a schematic configuration of the first and second power transmitting coils that are two adjacent power transmitting coils illustrated in FIG. 1. [Figure 4] FIG. 2 is a characteristic diagram illustrating the coupling coefficient between the power transmitting and receiving coils with respect to the position of the power receiving coil according to the first embodiment of the present disclosure. [Diagram 5] 2 illustrates a second embodiment of the present disclosure and is a diagram illustrating a first example of a schematic configuration of a first power transmitting coil and a second power transmitting coil, which are two adjacent power transmitting coils illustrated in FIG. 1. FIG. [Figure 6] 2 illustrates a second embodiment of the present disclosure and is a diagram illustrating a second example of a schematic configuration of the first and second power transmitting coils, which are two adjacent power transmitting coils illustrated in FIG. 1. FIG. [Figure 7] 10 illustrates a third example of a schematic configuration of the first and second power transmitting coils, which are two adjacent power transmitting coils illustrated in FIG. 1, according to the second embodiment of the present disclosure. FIG. [Figure 8] FIG. 11 illustrates a characteristic diagram showing a coupling coefficient between a power transmitting coil and a power receiving coil with respect to the position of the power receiving coil according to the second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, modes (embodiments) for carrying out the present disclosure will be described with reference to the drawings.

[0010] (First embodiment) First, the first embodiment will be described.

[0011] Fig. 1 is a diagram illustrating an example of a schematic configuration of a wireless power supply system 10 according to a first embodiment of the present disclosure. As shown in Fig. 1, the wireless power supply system 10 includes a wireless power transmitting device 100 and a dolly 200 which is a wireless power receiving device. Fig. 1 also illustrates an XYZ coordinate system in which the horizontal direction relative to the paper surface is the X direction, the vertical direction relative to the paper surface is the Y direction, and the depth direction relative to the paper surface is the Z direction, and the X direction, Y direction, and Z direction are mutually orthogonal.

[0012] As shown in FIG. 1, the wireless power transmitting device 100 includes a first power transmitting coil 110, a second power transmitting coil 120, an AC power source 130, an AC / DC conversion device 141, an AC / DC conversion device 142, a power transmitting circuit 151, and a power transmitting circuit 152.

[0013] The first power transmitting coil 110 and the second power transmitting coil 120 are power transmitting coils for transmitting power to a power receiving coil 210 provided on the dolly 200, and are two adjacent power transmitting coils.

[0014] The AC power supply 130 corresponds to a commercial power supply, and in the case of Japan, outputs an AC voltage of 100V or 200V and a frequency of 50Hz or 60Hz.

[0015] AC / DC converters 141 and 142 receive an AC voltage from an AC power supply 130 as an input and convert the AC voltage into a DC voltage.

[0016] Power transmission circuits 151 and 152 receive DC voltages from AC / DC conversion devices 141 and 142, respectively, and output AC voltages of any frequency.

[0017] In addition, the first power transmitting coil 110 and the second power transmitting coil 120 have a structure in which, for example, a conductor is wound around them, and when AC voltages are applied to both ends of each coil from the power transmitting circuits 151 and 152, respectively, a magnetic flux is generated around the above-mentioned conductor.

[0018] A cart 200 which is a wireless power receiving device is, for example, a moving body which moves in the X direction relative to the wireless power transmitting device 100. The cart 200 includes a power receiving coil 210, a power receiving circuit 220, a DC / AC conversion device 230, and a load device 240, as shown in FIG.

[0019] The power receiving coil 210 is a coil for receiving power from the first power transmitting coil 110 and the second power transmitting coil 120. Specifically, the power receiving coil 210 has a structure in which a conductor is wound around, for example, and electromagnetic induction occurs due to magnetic flux generated from the first power transmitting coil 110 and the second power transmitting coil 120, generating an AC voltage across both ends.

[0020] The power receiving circuit 220 receives an AC voltage of an arbitrary frequency from the power receiving coil 210 as an input, and outputs a DC voltage.

[0021] The DC / AC conversion device 230 receives the DC voltage from the power receiving circuit 220 as an input, and outputs an AC voltage equivalent to that of a commercial power source.

[0022] Load device 240 receives an AC voltage equivalent to a commercial power supply from DC / AC conversion device 230 as an input and executes the functions of load device 240.

[0023] The cart 200 has wheels connected to a base on which the power receiving coil 210, the power receiving circuit 220, the DC / AC conversion device 230, and the load device 240 are placed, and moves on a floor surface. In this embodiment, the power receiving coil 210 placed on the cart 200 moves parallel to and close to a plurality of power transmitting coils 110 and 120 placed along the movement path of the cart 200 (the X direction in the example shown in FIG. 1), thereby wirelessly supplying power.

[0024] In addition, in FIG. 1, the distance between the power transmitting coils 110 and 120 and the power receiving coil 210 (between the power transmitting and receiving coils) in the power feeding direction (Y direction) is illustrated as H1, and the height, which is the length of the power transmitting coils 110 and 120 in the Y direction, is illustrated as H2. In this case, the power feeding direction between the power transmitting and receiving coils does not matter in the direction with respect to the floor surface described above. In this embodiment, even when the height H2 of the power transmitting coils 110 and 120 is larger than the distance H1 between the power transmitting and receiving coils in the power feeding direction (Y direction), a wireless power transmitting device 100 is provided that can suppress a decrease in the coupling coefficient between the power transmitting and receiving coils. In addition, in this embodiment, there may be two or more sets (more specifically, three or more sets) of power transmitting coils (110 and 120), power transmitting circuits (151 and 152), and AC / DC conversion devices (141 and 142).

[0025] In this embodiment, the current (AC current) flowing through the first power transmitting coil 110 and the current (AC current) flowing through the second power transmitting coil 120 are preferably in phase with each other. This is to avoid a problem in which the AC current flowing through the first power transmitting coil 110 and the AC current flowing through the second power transmitting coil 120 are out of phase with each other, resulting in a decrease in power transmission efficiency.

[0026] Fig. 2 illustrates the first embodiment of the present disclosure and is a diagram illustrating a first example of a schematic configuration of a first power transmitting coil 110 and a second power transmitting coil 120, which are two adjacent power transmitting coils illustrated in Fig. 1. In Fig. 2, components similar to those illustrated in Fig. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. Fig. 2 also illustrates an XYZ coordinate system corresponding to the XYZ coordinate system illustrated in Fig. 1.

[0027] As shown in FIG. 2, the first power transmitting coil 110 has a portion 111 of a first conductor width W1 in a conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, in the first power transmitting coil 110 shown in FIG. 2, the portion 111 of the first conductor width W1 preferably occupies more than half (more preferably more than 80%) of the conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1, taking into consideration manufacturing errors and the like. Furthermore, as shown in FIG. 2, the first power transmitting coil 110 has a portion 112 of a second conductor width W1' in a conductor portion arranged in a direction perpendicular (Z direction) to the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, as shown in FIG. 2, the height H2 of the first power transmitting coil 110 corresponds to the length of the portion 111 of the first conductor width W1 in a direction intersecting the first conductor width W1 (more specifically, in this embodiment, a direction perpendicular).

[0028] 2, the second power transmitting coil 120 has a portion 121 of a third conductor width W2 in a conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, in the second power transmitting coil 120 shown in FIG. 2, the portion 121 of the third conductor width W2 preferably occupies more than half (more preferably more than 80%) of the conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1, taking into consideration manufacturing errors and the like. Furthermore, as shown in FIG. 2, the second power transmitting coil 120 has a portion 122 of a fourth conductor width W2' in a conductor portion arranged in a direction perpendicular (Z direction) to the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, as shown in FIG. 2, the height H2 of the second power transmitting coil 120 corresponds to the length of the portion 121 of the third conductor width W2 in a direction intersecting the third conductor width W2 (more specifically, in this embodiment, a direction perpendicular).

[0029] 2 also illustrates a state in which the portion 112 of the first power transmitting coil 110 having the second conductor width W1' and the portion 122 of the second power transmitting coil 120 having the fourth conductor width W2' are adjacent to each other at a predetermined distance D. In this case, the predetermined distance D is a distance in the movement direction (X direction) of the cart 200, which is a moving body including the power receiving coil 210 shown in FIG. 1. In addition, the predetermined distance D is preferably an average distance between the portion 112 of the second conductor width W1' of the first power transmitting coil 110 and the portion 122 of the fourth conductor width W2' of the second power transmitting coil 120, taking into account manufacturing errors and the like.

[0030] 2, in an adjacent portion between the portion 112 of the second conductor width W1' of the first power transmitting coil 110 and the portion 122 of the fourth conductor width W2' of the second power transmitting coil 120, the distance L in the movement direction (X direction) of the cart 200 including each conductor portion is as follows: That is, as shown in FIG. 2, the distance L is the sum of the second conductor width W1', the fourth conductor width W2', and a predetermined separation distance D.

[0031] In the wireless power transmitting device 100 of this embodiment, the second conductor width W1' and the fourth conductor width W2' are made smaller than the first conductor width W1 and the third conductor width W2 to shorten the distance L and suppress a decrease in the coupling coefficient between the transmitting and receiving coils. More specifically, in this embodiment, the sum of the second conductor width W1' and the fourth conductor width W2' is made smaller than the sum of the first conductor width W1 and the third conductor width W2. Furthermore, in this embodiment, the predetermined separation distance D is set to be equal to or smaller than the conductor width of the second conductor width W1' and the fourth conductor width W2'. This configuration of this embodiment suppresses a decrease in the coupling coefficient between the transmitting and receiving coils.

[0032] Fig. 3 illustrates the first embodiment of the present disclosure and is a diagram illustrating a second example of a schematic configuration of the first power transmitting coil 110 and the second power transmitting coil 120, which are two adjacent power transmitting coils illustrated in Fig. 1. In Fig. 3, components similar to those illustrated in Fig. 1 and Fig. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. Fig. 3 also illustrates an XYZ coordinate system corresponding to the XYZ coordinate system illustrated in Fig. 1 and Fig. 2.

[0033] Specifically, the second example shown in Fig. 3 is an example in which the number of turns of the first power transmitting coil 110 and the second power transmitting coil 120 are increased compared to the first example shown in Fig. 2. Specifically, the first example shown in Fig. 2 has the first power transmitting coil 110 with one turn and the second power transmitting coil 120 with one turn. In contrast, the second example shown in Fig. 3 has the first power transmitting coils 110-1 and 110-2 with two turns and the second power transmitting coils 120-1 and 120-2 with two turns. As described above, in this embodiment, the number of turns of the first power transmitting coil 110 and the second power transmitting coil 120 is not limited to one and may be multiple (two or more).

[0034] Fig. 4 illustrates the first embodiment of the present disclosure and is a characteristic diagram showing a coupling coefficient between the power transmitting and receiving coils with respect to the position of the power receiving coil 210. In Fig. 4, the horizontal axis indicates the position of the power receiving coil 210, and the middle position of the predetermined separation distance D shown in Fig. 2 is set to 0 mm, the position facing the first power transmitting coil 110 on the left side is set to a negative position, and the position facing the second power transmitting coil 120 on the right side is set to a positive position. In Fig. 4, the vertical axis indicates the coupling coefficient between the power transmitting and receiving coils, and specifically indicates the sum of the coupling coefficient between the first power transmitting coil 110 and the power receiving coil 210 and the coupling coefficient between the second power transmitting coil 120 and the power receiving coil 210.

[0035] Data series 1 shown by dotted lines in Fig. 4 shows characteristics when the first conductor width W1 and the third conductor width W2 shown in Fig. 2 are 30 mm, the predetermined separation distance D shown in Fig. 2 is 1 mm, and the second conductor width W1' and the fourth conductor width W2' are 30 mm. Data series 2 shown by solid lines in Fig. 4 shows characteristics when the first conductor width W1 and the third conductor width W2 shown in Fig. 2 are 30 mm, the predetermined separation distance D shown in Fig. 2 is 1 mm, and the second conductor width W1' and the fourth conductor width W2' are 15 mm. From the characteristic diagram shown in Fig. 4, it can be seen that in data series 1, the coupling coefficient between the transmitting and receiving coils on the vertical axis is lower when the position of the receiving coil 210 is near 0 mm than when the position of the receiving coil 210 on the horizontal axis is not near 0 mm, but that this is improved in data series 2.

[0036] Table 1 below shows the rate of decrease from the maximum value to the minimum value in the coupling coefficient between the power transmitting and receiving coils with respect to the position of the power receiving coil 210. [Table 1]

[0037] Data sequence 1 in Table 1 corresponds to data sequence 1 shown in FIG. 4. Data sequence 2 in Table 1 corresponds to data sequence 2 shown in FIG. 4. When the rate of decrease in the coupling coefficient between the transmitting and receiving coils from the maximum value to the minimum value with respect to the position of the receiving coil 210 is calculated for data sequence 1 shown in FIG. 4, it is 7.2% as shown in Table 1. When the rate of decrease in the coupling coefficient between the transmitting and receiving coils from the maximum value to the minimum value with respect to the position of the receiving coil 210 is calculated for data sequence 2 shown in FIG. 4, it is 2.4% as shown in Table 1. Furthermore, a data sequence in which the condition in which the predetermined separation distance D is 1 mm in the above-mentioned data sequence 2 is changed to a condition in which the predetermined separation distance D is 15 mm is set as data sequence 3, and a data sequence in which the condition in which the predetermined separation distance D is changed to a condition in which the predetermined separation distance D is 20 mm is set as data sequence 4. When the rate of decrease in the coupling coefficient between the transmitting and receiving coils from the maximum value to the minimum value with respect to the position of the receiving coil 210 is calculated for data sequence 3, it is 5.6% as shown in Table 1. Furthermore, as shown in Table 1, when the rate of decrease from the maximum value to the minimum value of the coupling coefficient between the power transmitting and receiving coils with respect to the position of the power receiving coil 210 was calculated for data string 4, it was 8.8%.

[0038] From the results shown in Table 1, it was found that the rate of decrease from the maximum value to the minimum value of the coupling coefficient between the transmitting and receiving coils with respect to the position of the receiving coil 210 is smaller in the data sequence 2 and the data sequence 3 than in the data sequence 1, and the decrease in the coupling coefficient between the transmitting and receiving coils can be suppressed. Specifically, in the data sequence 2 applicable to this embodiment, the sum (30 mm) of the second conductor width W1' and the fourth conductor width W2' is smaller than the sum (60 mm) of the first conductor width W1 and the third conductor width W2. Furthermore, in the data sequence 2 applicable to this embodiment, the predetermined separation distance D (1 mm) is equal to or smaller than the smaller conductor width of the second conductor width W1' and the fourth conductor width W2' (15 mm or less). Moreover, in the data sequence 3 applicable to this embodiment, the sum (30 mm) of the second conductor width W1' and the fourth conductor width W2' is smaller than the sum (60 mm) of the first conductor width W1 and the third conductor width W2. Furthermore, in the data string 3 applicable to this embodiment, the predetermined separation distance D (15 mm) is equal to or smaller (15 mm or less) of the second conductor width W1' and the fourth conductor width W2'.

[0039] Moreover, from the results shown in Table 1, it can be seen that the decrease in the coupling coefficient between the transmitting and receiving coils can be improved even if the predetermined separation distance D is widened to about the second conductor width W1' or the fourth conductor width W2'. Note that, in the example shown in Table 1, the characteristic results are shown when the first conductor width W1 and the third conductor width W2 are both 30 mm, but the conductor width is not limited to this. In this embodiment, it is sufficient that the second conductor width W1' and the fourth conductor width W2' are less than the first conductor width W1 and less than the third conductor width W2, and the predetermined separation distance D is equal to or less than the smaller conductor width of the second conductor width W1' and the fourth conductor width W2'.

[0040] According to the first embodiment, it is possible to suppress a decrease in the coupling coefficient between the power transmitting and receiving coils when the power receiving coil moves parallel to approach the adjacent parts of the two power transmitting coils by reducing the conductor widths W1' and W2' of the adjacent parts of the two power transmitting coils and limiting the predetermined separation distance D. For example, according to the first embodiment, even when the height H2 of the power transmitting coils 110 and 120 is larger than the separation distance H1 in the power feeding direction (Y direction) between the power transmitting and receiving coils, it is possible to suppress a decrease in the coupling coefficient between the power transmitting and receiving coils.

[0041] Second Embodiment Next, a second embodiment will be described. In the following description of the second embodiment, matters common to the first embodiment will be omitted, and only matters different from the first embodiment will be described.

[0042] The schematic configuration of the wireless power supply system according to the second embodiment is similar to the schematic configuration of the wireless power supply system 10 according to the first embodiment shown in FIG.

[0043] Fig. 5 illustrates a second embodiment of the present disclosure, and is a diagram illustrating a first example of a schematic configuration of the first power transmitting coil 110 and the second power transmitting coil 120, which are two adjacent power transmitting coils illustrated in Fig. 1. In Fig. 5, components similar to those illustrated in Figs. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. Fig. 5 also illustrates an XYZ coordinate system corresponding to the XYZ coordinate system illustrated in Fig. 1.

[0044] As shown in FIG. 5, the first power transmitting coil 110 has a portion 511 of a first conductor width W1 in a conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, in the first power transmitting coil 110 shown in FIG. 5, the portion 511 of the first conductor width W1 preferably occupies more than half (more preferably more than 80%) of the conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1, taking into consideration manufacturing errors and the like. Furthermore, as shown in FIG. 5, the first power transmitting coil 110 has a portion 512 of a second conductor width W1' in a conductor portion arranged in a direction perpendicular (Z direction) to the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, as shown in FIG. 5, the height H2 of the first power transmitting coil 110 corresponds to the length of the portion 511 of the first conductor width W1 in a direction intersecting the first conductor width W1 (more specifically, in this embodiment, a direction perpendicular).

[0045] 5, the second power transmitting coil 120 has a portion 521 of a third conductor width W2 in a conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, in the second power transmitting coil 120 shown in FIG. 5, the portion 521 of the third conductor width W2 preferably occupies more than half (more preferably more than 80%) of the conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1, taking into consideration manufacturing errors and the like. Furthermore, as shown in FIG. 5, the second power transmitting coil 120 has a portion 522 of a fourth conductor width W2' in a conductor portion arranged in a direction perpendicular (Z direction) to the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, as shown in FIG. 5, the height H2 of the second power transmitting coil 120 corresponds to the length of the portion 521 of the third conductor width W2 in a direction intersecting the third conductor width W2 (more specifically, in this embodiment, a direction perpendicular).

[0046] 5 also illustrates a state in which the portion 512 of the first power transmitting coil 110 having the second conductor width W1' and the portion 522 of the second power transmitting coil 120 having the fourth conductor width W2' are adjacent to each other with a predetermined overlap section S. Here, the predetermined overlap section S is an overlap section in the movement direction (X direction) of the dolly 200, which is a moving body including the power receiving coil 210 shown in FIG 1. In this case, in this embodiment, the size of the predetermined overlap section S is greater than 0.

[0047] 5, in an adjacent portion between the portion 512 of the second conductor width W1' of the first power transmitting coil 110 and the portion 522 of the fourth conductor width W2' of the second power transmitting coil 120, the distance L in the movement direction (X direction) of the carriage 200 including each conductor portion is as follows: That is, as shown in FIG. 5, the distance L is the difference between the sum of the second conductor width W1' and the fourth conductor width W2' and a predetermined overlapping section S.

[0048] 5, the adjacent portion between the first power transmitting coil 110 and the second power transmitting coil 120 is formed in an uneven shape to provide a predetermined overlapping section S, thereby shortening the distance L and suppressing a decrease in the coupling coefficient between the power transmitting and receiving coils. More specifically, in FIG. 5, the difference between the sum of the second conductor width W1' and the fourth conductor width W2' and the predetermined overlapping section S (i.e., the distance L) is made smaller than the sum of the first conductor width W1 and the third conductor width W2, thereby suppressing a decrease in the coupling coefficient between the power transmitting and receiving coils. Note that the adjacent portion between the first power transmitting coil 110 and the second power transmitting coil 120 is not limited to the uneven shape shown in FIG. 5, and may have a configuration having the predetermined overlapping section S in a shape other than the uneven shape shown in FIG. 5.

[0049] Here, in the example shown in FIG. 5, the height h1 of the portion 512 of the second conductor width W1' of the first power transmitting coil 110 corresponds to the length in the direction intersecting with the second conductor width W1' (more specifically, in the present embodiment, the direction perpendicular to the second conductor width W1'). In addition, in the example shown in FIG. 5, the height h2 of the portion 522 of the fourth conductor width W2' of the second power transmitting coil 120 corresponds to the length in the direction intersecting with the fourth conductor width W2' (more specifically, in the present embodiment, the direction perpendicular to the fourth conductor width W2'). In the example shown in FIG. 5, the sum of the height h1 of the portion 512 of the second conductor width W1' and the height h2 of the portion 522 of the fourth conductor width W2' is smaller than the height H2 of the portion 511 of the first conductor width W1 and the height H2 of the portion 521 of the third conductor width W2. For this reason, in the example shown in FIG. 5, the first power transmitting coil 110 and the second power transmitting coil 120, which are two power transmitting coils, are not in contact with each other.

[0050] Fig. 6 illustrates a second embodiment of the present disclosure, and is a diagram illustrating a second example of a schematic configuration of the first power transmitting coil 110 and the second power transmitting coil 120, which are two adjacent power transmitting coils illustrated in Fig. 1. In Fig. 6, the same components as those illustrated in Figs. 1 to 3 and 5 are denoted by the same reference numerals, and detailed description thereof will be omitted. Fig. 6 also illustrates an XYZ coordinate system corresponding to the XYZ coordinate system illustrated in Fig. 1.

[0051] As shown in FIG. 6, the first power transmitting coil 110 has a portion 611 of a first conductor width W1 in a conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, in the first power transmitting coil 110 shown in FIG. 6, the portion 611 of the first conductor width W1 preferably occupies more than half (more preferably more than 80%) of the conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1, taking into consideration manufacturing errors and the like. Furthermore, as shown in FIG. 6, the first power transmitting coil 110 has a portion 612 of a second conductor width W1' in a conductor portion arranged in a direction perpendicular (Z direction) to the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, as shown in FIG. 6, the height H2 of the first power transmitting coil 110 corresponds to the length of the portion 611 of the first conductor width W1 in a direction intersecting the first conductor width W1 (more specifically, in this embodiment, a direction perpendicular).

[0052] 6, the second power transmitting coil 120 has a portion 621 of a third conductor width W2 in a conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, in the second power transmitting coil 120 shown in FIG. 6, the portion 621 of the third conductor width W2 preferably occupies more than half (more preferably more than 80%) of the conductor portion arranged in the moving direction (X direction) of the cart 200 shown in FIG. 1, taking into consideration manufacturing errors and the like. Furthermore, as shown in FIG. 6, the second power transmitting coil 120 has a portion 622 of a fourth conductor width W2' in a conductor portion arranged in a direction perpendicular (Z direction) to the moving direction (X direction) of the cart 200 shown in FIG. 1. Here, as shown in FIG. 6, the height H2 of the second power transmitting coil 120 corresponds to the length of the portion 621 of the third conductor width W2 in a direction intersecting the third conductor width W2 (more specifically, in this embodiment, a direction perpendicular).

[0053] 6 also illustrates a state in which the portion 612 of the first power transmitting coil 110 having the second conductor width W1' and the portion 622 of the second power transmitting coil 120 having the fourth conductor width W2' are adjacent to each other with a predetermined overlap section S. Here, the predetermined overlap section S is an overlap section in the movement direction (X direction) of the dolly 200, which is a moving body including the power receiving coil 210 shown in FIG 1. In this case, in this embodiment, the size of the predetermined overlap section S is larger than 0.

[0054] 6, in an adjacent portion between the portion 612 of the second conductor width W1' of the first power transmitting coil 110 and the portion 622 of the fourth conductor width W2' of the second power transmitting coil 120, the distance L in the movement direction (X direction) of the carriage 200 including each conductor portion is as follows: That is, as shown in FIG. 6, the distance L is the difference between the sum of the second conductor width W1' and the fourth conductor width W2' and a predetermined overlapping section S.

[0055] 6, the adjacent portion between the first power transmitting coil 110 and the second power transmitting coil 120 is formed in a multi-step uneven shape to provide a predetermined overlapping section S, thereby shortening the distance L and suppressing a decrease in the coupling coefficient between the power transmitting and receiving coils. More specifically, in FIG. 6, the difference between the sum of the second conductor width W1' and the fourth conductor width W2' and the predetermined overlapping section S (i.e., the distance L) is made smaller than the sum of the first conductor width W1 and the third conductor width W2, thereby suppressing a decrease in the coupling coefficient between the power transmitting and receiving coils.

[0056] Here, in the example shown in FIG. 6, the height h11 of the lower portion of the portion 612 of the second conductor width W1' of the first power transmitting coil 110 corresponds to the length in the direction intersecting the second conductor width W1' at the lower portion (more specifically, in the present embodiment, the direction perpendicular to the second conductor width W1'). Similarly, in the example shown in FIG. 6, the height h12 of the upper portion of the portion 612 of the second conductor width W1' of the first power transmitting coil 110 corresponds to the length in the direction intersecting the second conductor width W1' at the upper portion (more specifically, in the present embodiment, the direction perpendicular to the second conductor width W1'). Also, in the example shown in FIG. 6, the height h21 of the portion 622 of the fourth conductor width W2' of the second power transmitting coil 120 corresponds to the length in the direction intersecting the fourth conductor width W2' (more specifically, in the present embodiment, the direction perpendicular to the fourth conductor width W2'). 6, the sum of the height h11 and height h12 of the portion 612 of the second conductor width W1' and the height h21 of the portion 622 of the fourth conductor width W2' is smaller than the height H2 of the portion 611 of the first conductor width W1 and the height H2 of the portion 621 of the third conductor width W2. For this reason, in the example shown in FIG. 6, the first power transmitting coil 110 and the second power transmitting coil 120, which are two power transmitting coils, are not in contact with each other.

[0057] Fig. 7 illustrates a second embodiment of the present disclosure, and is a diagram illustrating a third example of a schematic configuration of the first power transmitting coil 110 and the second power transmitting coil 120, which are two adjacent power transmitting coils illustrated in Fig. 1. In Fig. 7, the same components as those illustrated in Figs. 1 to 3 and 5 to 6 are denoted by the same reference numerals, and detailed description thereof will be omitted. Fig. 7 also illustrates an XYZ coordinate system corresponding to the XYZ coordinate system illustrated in Figs. 1 and 5.

[0058] Specifically, the third example shown in Fig. 7 is an example in which the number of turns of the first power transmitting coil 110 and the second power transmitting coil 120 are increased compared to the first example shown in Fig. 5. Specifically, the first example shown in Fig. 5 has the first power transmitting coil 110 with one turn and the second power transmitting coil 120 with one turn. In contrast, the third example shown in Fig. 7 has the first power transmitting coils 110-1 and 110-2 with two turns and the second power transmitting coils 120-1 and 120-2 with two turns. As described above, in this embodiment, the number of turns of the first power transmitting coil 110 and the second power transmitting coil 120 is not limited to one and may be multiple (two or more).

[0059] Fig. 8 illustrates a second embodiment of the present disclosure and is a characteristic diagram showing a coupling coefficient between the power transmitting and receiving coils with respect to the position of the power receiving coil 210. In Fig. 8, the horizontal axis indicates the position of the power receiving coil 210, and the middle position of the predetermined overlapping section S shown in Fig. 5 is set to 0 mm, the position facing the first power transmitting coil 110 on the left side is set to a negative position, and the position facing the second power transmitting coil 120 on the right side is set to a positive position. In Fig. 8, the vertical axis indicates the coupling coefficient between the power transmitting and receiving coils, and specifically indicates the sum of the coupling coefficient between the first power transmitting coil 110 and the power receiving coil 210 and the coupling coefficient between the second power transmitting coil 120 and the power receiving coil 210.

[0060] Data sequence 1 shown by a dotted line in FIG. 8 indicates characteristics in the case of the configuration of the first power transmitting coil 110 and the second power transmitting coil 120 shown in FIG. 2. Specifically, data sequence 1 in FIG. 8 indicates characteristics in the case of setting the first conductor width W1, the second conductor width W1', the third conductor width W2, and the fourth conductor width W2' shown in FIG. 2 to 30 mm, setting the separation distance D shown in FIG. 2 to 1 mm, and setting the predetermined overlap section S to 0 mm. Data sequence 2 shown by a solid line in FIG. 8 indicates characteristics in the case of setting the first conductor width W1, the second conductor width W1', the third conductor width W2, and the fourth conductor width W2' shown in FIG. 5 to 30 mm, and setting the predetermined overlap section S shown in FIG. 5 to 29 mm. From the characteristic diagram shown in FIG. 8, it can be seen that in data series 1, the coupling coefficient between the transmitting and receiving coils on the vertical axis is lower when the position of the receiving coil 210 is near 0 mm compared to other positions where the position of the receiving coil 210 on the horizontal axis is near 0 mm, but that in data series 2, this is improved.

[0061] Table 2 below shows the rate of decrease from the maximum value to the minimum value in the coupling coefficient between the power transmitting and receiving coils with respect to the position of the power receiving coil 210. [Table 2]

[0062] Data sequence 1 in Table 2 corresponds to data sequence 1 shown in FIG. 8. Data sequence 2 in Table 2 corresponds to data sequence 2 shown in FIG. 8. When the rate of decrease in the coupling coefficient between the transmitting and receiving coils from the maximum value to the minimum value with respect to the position of the receiving coil 210 is calculated for data sequence 1 shown in FIG. 8, it is 7.2% as shown in Table 2. When the rate of decrease in the coupling coefficient between the transmitting and receiving coils from the maximum value to the minimum value with respect to the position of the receiving coil 210 is calculated for data sequence 2 shown in FIG. 8, it is 1.7% as shown in Table 2. Furthermore, a data sequence in which the condition that the predetermined overlap section S is 29 mm in the above-mentioned data sequence 2 is changed to a condition that the predetermined overlap section S is 15 mm is defined as data sequence 3, and a data sequence in which the condition that the predetermined overlap section S is 1 mm is changed to a condition that the predetermined overlap section S is 1 mm is defined as data sequence 4. When the rate of decrease in the coupling coefficient between the transmitting and receiving coils from the maximum value to the minimum value with respect to the position of the receiving coil 210 is calculated for data sequence 3, it is 4.4% as shown in Table 2. Furthermore, as shown in Table 2, when the rate of decrease from the maximum value to the minimum value of the coupling coefficient between the power transmitting and receiving coils with respect to the position of the power receiving coil 210 was calculated for data string 4, it was 7.0%.

[0063] From the results shown in Table 2, it was found that the rate of decrease from the maximum value to the minimum value of the coupling coefficient between the transmitting and receiving coils with respect to the position of the receiving coil 210 is smaller in the data series 2, 3, and 4 than in the data series 1, and the decrease in the coupling coefficient between the transmitting and receiving coils can be suppressed. Specifically, in the data series 2 applicable to this embodiment, the difference (31 mm: distance L) between the sum of the second conductor width W1' and the fourth conductor width W2' and the predetermined overlap section S is smaller than the sum (60 mm) of the first conductor width W1 and the third conductor width W2. In addition, in the data series 3 applicable to this embodiment, the difference (45 mm: distance L) between the sum of the second conductor width W1' and the fourth conductor width W2' and the predetermined overlap section S is smaller than the sum (60 mm) of the first conductor width W1 and the third conductor width W2. Furthermore, in the data string 4 applicable to this embodiment, the difference (59 mm: distance L) between the sum of the second conductor width W1' and the fourth conductor width W2' and the specified overlap section S is smaller than the sum (60 mm) of the first conductor width W1 and the third conductor width W2.

[0064] From the results shown in Table 2, it can be seen that if the size of the predetermined overlap section S is greater than 0 (data sequence 2 to 4), the decrease in the coupling coefficient between the transmitting and receiving coils can be improved compared to when the size of the predetermined overlap section S is 0 (data sequence 1). Note that, in the example shown in Table 2, the characteristic results are shown when the first conductor width W1 and the third conductor width W2 are both 30 mm, but the conductor width is not limited to this. In this embodiment, it is sufficient to maintain the relationship that the difference between the sum of the second conductor width W1' and the fourth conductor width W2' and the predetermined overlap section S is smaller than the sum of the first conductor width W1 and the third conductor width W2.

[0065] According to the second embodiment, it is possible to suppress a decrease in the coupling coefficient between the power transmitting and receiving coils when the power receiving coil moves parallel to the adjacent portions of the two power transmitting coils by forming the conductor portion in an uneven shape at the adjacent portions of the two power transmitting coils to provide a predetermined overlapping section S. For example, according to the second embodiment, even when the height H2 of the power transmitting coils 110 and 120 is larger than the separation distance H1 between the power transmitting and receiving coils in the power feeding direction (Y direction), it is possible to suppress a decrease in the coupling coefficient between the power transmitting and receiving coils.

[0066] It should be noted that the above-described embodiments of the present disclosure are merely illustrative examples of the implementation of the present disclosure, and the technical scope of the present disclosure should not be interpreted as being limited by these. In other words, the present disclosure can be implemented in various forms without departing from its technical concept or main features.

[0067] Embodiments of the present disclosure include the following configurations. [Configuration 1] a first power transmitting coil for transmitting power to the power receiving coil, the first power transmitting coil having a portion with a first conductor width and a portion with a second conductor width; a second power transmitting coil for transmitting power to the power receiving coil, the second power transmitting coil having a portion with a third conductor width and a portion with a fourth conductor width; having the first power transmitting coil and the second power transmitting coil are spaced a predetermined distance apart from each other, with the second conductor width portion adjacent to the fourth conductor width portion, a sum of the second conductor width and the fourth conductor width is smaller than a sum of the first conductor width and the third conductor width; The predetermined distance is equal to or less than the smaller of the second conductor width and the fourth conductor width. A wireless power transmission device comprising: [Configuration 2] The predetermined distance is a distance in a moving direction of a moving body including the power receiving coil. 2. The wireless power transmitting device according to configuration 1. [Configuration 3] The predetermined separation distance is an average distance between the portion of the second conductor width and the portion of the fourth conductor width. 3. The wireless power transmitting device according to configuration 1 or 2. [Configuration 4] a first power transmitting coil for transmitting power to the power receiving coil, the first power transmitting coil having a portion with a first conductor width and a portion with a second conductor width; a second power transmitting coil for transmitting power to the power receiving coil, the second power transmitting coil having a portion with a third conductor width and a portion with a fourth conductor width; having the first power transmitting coil and the second power transmitting coil have a predetermined overlapping section, and a portion of the second conductor width is adjacent to a portion of the fourth conductor width; A difference between the sum of the second conductor width and the fourth conductor width and the predetermined overlapping section is smaller than a sum of the first conductor width and the third conductor width. A wireless power transmission device comprising: [Configuration 5] The predetermined overlapping section is an overlapping section in a moving direction of a moving body including the power receiving coil. 5. The wireless power transmitting device according to configuration 4. [Configuration 6] The size of the predetermined overlapping section is greater than 0. 6. The wireless power transmitting device according to configuration 4 or 5. [Configuration 7] The sum of the height of the portion of the second conductor width in a direction intersecting the second conductor width and the height of the portion of the fourth conductor width in a direction intersecting the fourth conductor width is a height in a direction intersecting the first conductor width in the portion of the first conductor width and a height in a direction intersecting the third conductor width in the portion of the third conductor width that is smaller than the height 7. The wireless power transmitting device according to claim 4, wherein: [Configuration 8] The number of turns of the first power transmitting coil and the second power transmitting coil is one or more. 8. The wireless power transmitting device according to claim 1, wherein: [Configuration 9] The current flowing through the first power transmitting coil and the current flowing through the second power transmitting coil are in phase with each other. 9. The wireless power transmitting device according to any one of configurations 1 to 8. [Configuration 10] a conductor portion of the first power transmitting coil arranged in a moving direction of a moving body including the power receiving coil has a first conductor width portion occupying half or more of the first conductor width, In the second power transmitting coil, a conductor portion arranged in a moving direction of the moving body has a width equal to or larger than half of the width of the third conductor. 10. The wireless power transmitting device according to claim 1, wherein: [Explanation of symbols]

[0068] 10: wireless power feeding system, 100: wireless power transmitting device, 110: first power transmitting coil, 111: first conductor width W1 portion, 112: second conductor width W1' portion, 120: second power transmitting coil, 121: third conductor width W2 portion, 122: fourth conductor width W2' portion, 130: AC power source, 141, 142: AC / DC conversion device, 151, 152: power transmitting circuit, 200: cart (wireless power receiving device), 210: power receiving coil, 220: power receiving circuit, 230: DC / AC conversion device, 240: load device

Claims

1. a first power transmitting coil for transmitting electric power to the power receiving coil, the first power transmitting coil having a portion with a first conductor width and a portion with a second conductor width; a second power transmitting coil for transmitting power to the power receiving coil, the second power transmitting coil having a portion with a third conductor width and a portion with a fourth conductor width; having the first power transmitting coil and the second power transmitting coil are spaced apart from each other by a predetermined distance, and a portion of the second conductor width is adjacent to a portion of the fourth conductor width; a sum of the second conductor width and the fourth conductor width is smaller than a sum of the first conductor width and the third conductor width; The predetermined separation distance is equal to or less than the smaller conductor width of the second conductor width and the fourth conductor width. A wireless power transmission device comprising:

2. The predetermined distance is a distance in a moving direction of a moving body including the power receiving coil.

2. The wireless power transmitting device according to claim 1 .

3. The predetermined separation distance is an average distance between the portion of the second conductor width and the portion of the fourth conductor width.

2. The wireless power transmitting device according to claim 1 .

4. a first power transmitting coil for transmitting electric power to the power receiving coil, the first power transmitting coil having a portion with a first conductor width and a portion with a second conductor width; a second power transmitting coil for transmitting power to the power receiving coil, the second power transmitting coil having a portion with a third conductor width and a portion with a fourth conductor width; having the first power transmitting coil and the second power transmitting coil have a predetermined overlapping section, and a portion of the second conductor width and a portion of the fourth conductor width are adjacent to each other; A difference between the sum of the second conductor width and the fourth conductor width and the predetermined overlapping section is smaller than a sum of the first conductor width and the third conductor width. A wireless power transmission device comprising:

5. The predetermined overlapping section is an overlapping section in a moving direction of a moving body including the power receiving coil.

5. The wireless power transmitting device according to claim 4.

6. The size of the predetermined overlapping section is greater than 0.

5. The wireless power transmitting device according to claim 4.

7. A sum of a height in a direction intersecting the second conductor width in the portion of the second conductor width and a height in a direction intersecting the fourth conductor width in the portion of the fourth conductor width is smaller than a height in a direction intersecting the first conductor width in the portion of the first conductor width and a height in a direction intersecting the third conductor width in the portion of the third conductor width.

5. The wireless power transmitting device according to claim 4.

8. The number of turns of the first power transmitting coil and the second power transmitting coil is one or more.

5. The wireless power transmitting device according to claim 1, wherein the power transmitting device is a power receiving device.

9. The current flowing through the first power transmitting coil and the current flowing through the second power transmitting coil are in phase with each other.

5. The wireless power transmitting device according to claim 1, wherein the power transmitting device is a power receiving device.

10. a conductor portion of the first power transmitting coil arranged in a moving direction of a moving body including the power receiving coil has a first conductor width portion occupying half or more of the first conductor width, In the second power transmitting coil, a conductor portion arranged in a moving direction of the moving body has a width equal to or larger than half of the width of the third conductor.

5. The wireless power transmitting device according to claim 1, wherein the power transmitting device is a power receiving device.

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