Power supply device

Abstract

The technology disclosed in this specification relates to a power supply device (10) for supplying power to a seat (S) that can slide and rotate relative to a floor portion (F) of a vehicle, comprising: a power transmission unit (40) arranged on the floor portion (F) and extending along the sliding direction of the seat (S); and a power receiving unit (70) arranged on the seat (S) and receiving power from the power transmission unit (40) in a non-contact manner, wherein the power transmission unit (40) sets a length dimension in the sliding direction longer than a length dimension in a direction orthogonal to the sliding direction, and a portion of the power receiving unit (70) that receives power from the power transmission unit (40) is arranged within a setting range of the power transmission unit (40) in a state close to the power transmission unit (40) during the sliding and rotational movement of the seat (S).

Description

Technical Field

[0001] The technology disclosed in this specification relates to a power supply device. Background Art

[0002] For example, as a power supply mechanism for contactlessly supplying power to a sliding seat mounted on a vehicle, there is known a structure described in Japanese Patent Publication No. 2013-162609 (hereinafter referred to as Patent Document 1). The power supply mechanism includes a power supply unit erected on the floor portion of the vehicle body and a power receiving unit provided on the leg portion of the sliding seat. The power receiving unit and the power supply unit are opposite to each other in the front-rear direction, and the power receiving unit is contactlessly supplied with power by the power supply unit.

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2013-162609 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in recent years, the high functionality of seats has been studied due to the autonomous driving of vehicles, etc. Moreover, regarding seats mounted on vehicles, seats having not only a sliding function with respect to the vehicle body but also a rotating function have been studied.

[0008] However, in the case where the seat has a rotation function, the power receiving unit moves to a position where power cannot be supplied from the power supply unit as the seat rotates. Therefore, power cannot be supplied from the power supply unit to the power receiving unit.

[0009] This specification discloses a technology for contactlessly supplying power to a seat that can slide and rotate.

[0010] Solutions to Solve Problems

[0011] The present disclosure relates to a power supply device for supplying power to a seat that can slide and rotate relative to a floor portion of a vehicle, the power supply device comprising: a power transmission portion, which is arranged on the floor portion and extends along a sliding direction of the seat; a power receiving portion, which is arranged at the bottom of the seat and receives power from the power transmission portion in a non-contact manner, wherein the power transmission portion sets a length dimension in the sliding direction to be longer than a length dimension in a direction orthogonal to the sliding direction, and a portion of the power receiving portion that receives power from the power transmission portion is arranged within a setting range of the power transmission portion in a state close to the power transmission portion during the sliding and rotational movement of the seat.

[0012] Effects of the Invention

[0013] According to the technology disclosed in this specification, it is possible to supply power to a slidable and rotatable seat in a contactless manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a perspective view showing a state where the power supply device according to Embodiment 1 is attached to a rotating table of a seat.

[0015] Figure 2 It is a top view showing a state where the power supply device is mounted on the rotating table.

[0016] Figure 3 It is a perspective view showing a state where the power receiving unit attached to the rotating table is viewed obliquely from below.

[0017] Figure 4 It is a bottom view showing a state where a power receiving unit is mounted under a seat.

[0018] Figure 5 This is an enlarged top view of the main parts of the power receiving unit.

[0019] Figure 6 It is a plan view showing a state where a power receiving coil is arranged on a power transmission coil.

[0020] Figure 7 is Figure 6 A conceptual diagram showing the state of the magnetic flux of the power transmission coil in the AA section of FIG.

[0021] Figure 8 This is a plan view showing a state where the power receiving coil is rotated 60 degrees on the power transmitting coil.

[0022] Fig. 9 This is a plan view showing a state where the power receiving coil is rotated 90 degrees on the power transmitting coil.

[0023] Fig.10 is Fig. 9 A conceptual diagram showing the state of the magnetic flux of the power transmission coil in the BB section of FIG.

[0024] Fig.11 It is an enlarged plan view of a main part of the power receiving unit according to the second embodiment.

[0025] Fig.12 It is a plan view showing a state where a power receiving coil is arranged on a power transmission coil.

[0026] Fig.13 It is an enlarged plan view of a main part of a power receiving unit according to a third embodiment.

[0027] Fig.14 It is a plan view showing a state where a power receiving coil is arranged on a power transmission coil.

[0028] Fig.15 This is a diagram showing the transmission efficiency of the first embodiment and the third embodiment.

[0029] Fig.16 1 is a diagram showing magnetic field distribution during power transmission by the power supply device according to the first embodiment. DETAILED DESCRIPTION

[0030] (Overview of this embodiment)

[0031] First, an overview of the embodiments disclosed in this specification will be described.

[0032] (1) A power supply device for supplying power to a seat that can slide and rotate relative to a floor portion of a vehicle, the power supply device comprising: a power transmission unit, which is arranged on the floor portion and extends along a sliding direction of the seat; and a power receiving unit, which is arranged on a bottom of the seat and receives power from the power transmission unit in a non-contact manner, wherein the power transmission unit has a length dimension in the sliding direction that is longer than a length dimension in a direction orthogonal to the sliding direction, and a portion of the power receiving unit that receives power from the power transmission unit is arranged within a setting range of the power transmission unit in a state close to the power transmission unit during the sliding and rotational movement of the seat.

[0033] (2) The power transmission unit may include a power transmission coil formed by winding a winding, and the power reception unit may include a power reception coil formed by winding a winding and generating induced power by magnetic flux of the power transmission coil.

[0034] According to the power supply device with such a structure, even when the seat is sliding or rotating, the portion of the power receiving unit that receives power from the power transmitting unit is arranged close to the power transmitting unit and within the installation range of the power transmitting unit. Therefore, according to such a structure, non-contact power supply can be provided to the slidable and rotating seat by so-called electromagnetic induction.

[0035] (3) It may be that the power transmission coil comprises: a first power transmission annular coil having a first power transmission extension portion extending in a sliding direction; a second power transmission annular coil having a second power transmission extension portion extending in the sliding direction along the first power transmission extension portion, the direction of current in the second power transmission extension portion being the same as the direction of current in the first power transmission extension portion; and the power receiving coil comprises: a first power receiving annular coil having a first power receiving extension portion extending in the sliding direction along the first power transmission extension portion when the seat is facing the traveling direction of the vehicle; and a second power receiving annular coil having a second power receiving extension portion extending in the sliding direction along the first power receiving extension portion and the second power transmission extension portion, the direction of current in the second power receiving extension portion being the same as the direction of current in the first power receiving extension portion.

[0036] According to such a structure, the magnetic flux generated by the first power transmission annular coil and the magnetic flux generated by the second power transmission annular coil are in opposite directions, and an annular magnetic flux is generated with the portion where the first power transmission extension portion and the second power transmission extension portion are arranged along each other as the center. As a result, the magnetic flux of the portion where the first power transmission extension portion and the second power transmission extension portion of the power transmission unit are arranged along each other can be enhanced. Therefore, such a structure can improve the efficiency of contactless power supply to the seat compared with the case where the power transmission coil and the power receiving coil are configured in a circular shape to supply power.

[0037] However, in general, in the electromagnetic induction method, the magnetic flux of the power transmission coil of the power transmission unit that is not linked with the power receiving coil of the power receiving unit is leakage magnetic flux. Therefore, when the power receiving unit installed in the seat is supplied with power by the magnetic flux of the power transmission unit installed in the floor unit, the magnetic flux of the power transmission unit may leak to the outside.

[0038] However, according to such a structure, the magnetic flux generated by the first power transmission annular coil and the magnetic flux generated by the second power transmission annular coil are in opposite directions, and the magnetic fluxes other than the portion along which the first power transmission extension portion and the second power transmission extension portion are arranged are in a state of weakening each other. Thus, the leakage magnetic flux from the power transmission coil can be suppressed. Thus, the influence of the leakage magnetic flux of the power transmission unit on the outside can be suppressed.

[0039] (4) The first power transmission loop coil and the second power transmission loop coil may be connected in series.

[0040] According to such a structure, the circuit structure of the power transmission unit can be simplified. Moreover, the current of the first power transmission annular coil and the second power transmission annular coil can be made the same. That is, the magnetic flux generated by the first power transmission annular coil and the magnetic flux generated by the second power transmission annular coil can be easily made to have the same strength. As a result, the first power transmission extension unit and the second power transmission extension unit can effectively increase the strength of the mutual magnetic flux.

[0041] (5) The power receiving section may include at least one auxiliary power receiving coil formed by winding a winding and generating induced power by a magnetic flux of the power transmission coil, wherein the auxiliary power receiving coil includes: an auxiliary first annular coil having an auxiliary first extending portion extending in a direction intersecting the power receiving first extending portion; and an auxiliary second annular coil having an auxiliary second extending portion extending along the auxiliary first extending portion and generating a magnetic flux in a direction different from that of the auxiliary first annular coil.

[0042] However, when the seat rotates, the first and second extending portions of the power transmitting coil and the first and second extending portions of the power receiving coil are angularly offset in the rotation direction, thereby possibly reducing the power supply efficiency of the power receiving unit.

[0043] However, according to such a structure, the power receiving unit has an auxiliary power receiving coil, and the auxiliary power receiving coil has an auxiliary first extension portion extending in a direction intersecting the power receiving first extension portion and an auxiliary second extension portion extending in a direction intersecting the power receiving second extension portion. Thus, even if the power supply efficiency of the power receiving coil decreases due to the rotation of the seat, the power generated in the auxiliary power receiving coil can assist the power whose power supply efficiency in the power receiving coil decreases. Thus, the decrease in the efficiency of contactless power supply can be suppressed.

[0044] (6) The auxiliary first extension portion may extend in a direction perpendicular to the power receiving first extension portion, and the auxiliary second extension portion may extend in a direction perpendicular to the power receiving second extension portion.

[0045] When the seat rotates 90 degrees (π / 2 radians), the first and second extending portions of the power transmission coil are orthogonal to the first and second extending portions of the power reception coil, and the power supply from the power transmission coil to the power reception coil decreases.

[0046] However, according to such a structure, when the seat is rotated 90 degrees, the extension direction of the auxiliary first extension portion coincides with the extension direction of the power transmission first extension portion, and the extension direction of the auxiliary second extension portion coincides with the extension direction of the power transmission second extension portion. That is, the seat can be supplied with contactless power by the combination of the power transmission coil and the auxiliary power receiving coil, and the decrease in the efficiency of power supply to the seat can be suppressed.

[0047] (7) The power receiving unit may include a plurality of auxiliary power receiving coils, and in each of the auxiliary power receiving coils, the auxiliary first extending portion of the auxiliary first annular coil and the auxiliary first extending portion and the power receiving first extending portion of other auxiliary first annular coils may be arranged to be staggered in the rotation direction of the seat.

[0048] According to such a configuration, when the seat is rotated, the power whose power supply efficiency is reduced in the power receiving coil can be supplemented by power generated by one of the plurality of auxiliary power receiving coils, thereby enabling contactless power supply to the seat. This can suppress a reduction in the efficiency of power supply to the seat.

[0049] (Details of this embodiment)

[0050] The power supply device disclosed in this specification is not limited to the following examples, but is disclosed by the claims, and includes all modifications within the meaning and scope equivalent to the claims.

[0051] <Implementation Method 1>

[0052] Regarding Embodiment 1 of the technology disclosed in this specification, refer to Figures 1 to 10 Provide explanation.

[0053] like Figure 1 As shown, the present embodiment illustrates a power supply device 10 that supplies electric power to a seat S mounted in a vehicle. Figure 2 and Figure 3 In order to facilitate viewing of the power supply device 10 , the seat S is omitted from the illustration for the sake of simplicity.

[0054] like Figure 1 As shown, the seat S is slidable in the front-rear direction with respect to a pair of rails 20 fixed to a floor portion F of a vehicle compartment or the like by bolt fastening or the like.

[0055] The seat S is mounted on a pair of rails 20 so as to be slidable in the front-rear direction. The seat S is equipped with various electrical components such as an electric reclining device, a seat heater, a display such as a touch panel, an air conditioner, a sensor for detecting whether an occupant is seated, and a sensor for detecting whether a seat belt is worn. Power is supplied to the various electrical components from a power supply device 10 mounted at the bottom of the seat S.

[0056] like Figure 1 to Figure 4 As shown, a pair of rails 20 are arranged in parallel with a gap in the left-right direction. Each rail 20 is formed into a square tube shape extending linearly in the front-back direction. The metal constituting the rail 20 is stainless steel, aluminum, aluminum alloy, etc., and any metal can be appropriately selected according to needs.

[0057] In track 20, such as Figure 1 As shown, a support member 30 that slides forward and backward is installed across a pair of rails 20 .

[0058] The support member 30 includes a pair of leg portions 32 inserted in the through groove 22 provided in the upper plate of each rail 20 in the up-down direction, and a support portion body 34 connecting the pair of leg portions 32 .

[0059] The leg portion 32 is formed in a plate shape that is long in the front-rear direction. The lower end of the leg portion 32 can move in the front-rear direction in the rail 20. Therefore, the support member 30 and the seat S mounted on the support member 30 move in the front-rear direction on the rail 20 as the leg portion 32 moves in the front-rear direction in the rail.

[0060] The support body 34 is connected to the upper end of the leg 32 along the entire length in the front-to-back direction. The support body 34 is formed in a flat plate shape. Figure 1 As shown, the rotation mechanism 35 provided between the support member 30 and the seat S is mounted on the support portion main body 34 .

[0061] The rotating mechanism 35 is made of metal, and includes a base base 36 fixed to the support body 34 and a seat base 37 rotatably assembled to the base base 36 .

[0062] like Figure 2 As shown in FIG. 1 , the base base 36 is formed in a circular flat plate shape and is fixed to the support body 34 by bolt fastening or the like.

[0063] The seat base 37 is formed in a circular flat plate shape that is slightly smaller than the base base 36. The seat base 37 is fixed to the bottom surface of the seat S by bolt fastening or the like. The seat base 37 is rotatably assembled to the inner side of the base base 36 via a bearing or the like. Therefore, the seat base 37 rotates relative to the base base 36, and thereby the seat S rotates on the floor portion F.

[0064] The power supply device 10 includes a power transmission unit 40 mounted on the floor portion F, and a power reception unit 70 that receives power from the power transmission unit 40 in a contactless manner.

[0065] like Figure 2 , Figure 4 and Figure 6 As shown, the power transmission unit 40 is arranged to extend in the front-to-back direction between the pair of rails 20. The power transmission unit 40 has a power transmission coil 41 formed by winding a winding. The power transmission coil 41 has: a first power transmission annular coil 42 that is long in the front-to-back direction; and a second power transmission annular coil 46 that is long in the front-to-back direction and is arranged on the side of the first power transmission annular coil 42.

[0066] The first power transmission annular coil 42 is formed in an oval shape and has a first power transmission extension portion 43 extending in the front-rear direction and a first power transmission outer extension portion 44 extending in the front-rear direction in parallel with the first power transmission extension portion 43 .

[0067] The second power transmission annular coil 46 is formed in an oval shape and has a second power transmission extension portion 47 extending in the front-rear direction adjacent to the first power transmission extension portion 43 and a second power transmission outer extension portion 48 extending in the front-rear direction in parallel with the second power transmission extension portion 47 .

[0068] The first power transmission annular coil 42 and the second power transmission annular coil 46 are connected in series so that the direction of the current in the first power transmission extension portion 43 is the same as the direction of the current in the second power transmission extension portion 47. Therefore, the power transmission coil 41 including the first power transmission annular coil 42 and the second power transmission annular coil 46 is formed into an 8-shape.

[0069] That is, when current flows through the power transmission coil 41, Figure 7As shown, in the first power transmission annular coil 42 and the second power transmission annular coil 46, magnetic fluxes M of the same strength in opposite directions corresponding to the direction of current flow are generated according to the right-hand spiral law. As a result, the magnetic fluxes M1 of the first power transmission extension portion 43 and the second power transmission extension portion 47 are formed into an annular shape with the portion where the first power transmission extension portion 43 and the second power transmission extension portion 47 are arranged as the center, and the mutual magnetic fluxes M1 are effectively enhanced.

[0070] On the other hand, the magnetic flux generated in the first power transmission outer extension portion 44 and the second power transmission outer extension portion 48 includes the magnetic flux radiated to the outside without interlinking with the power receiving portion 70, and the magnetic flux leaking to the outside from the first power transmission annular coil 42 and the second power transmission annular coil 46. However, these leakage magnetic fluxes M2 are Figure 7 As shown, the magnetic flux M2 is in the opposite direction to the magnetic flux M1A, which is a part of the magnetic flux M1 that reinforces each other in the first power transmission extension portion 43 and the second power transmission extension portion 47 , and thus the leakage magnetic flux M2 is weakened by the magnetic flux M1A.

[0071] like Figure 2 and Figure 3 As shown, the power receiving unit 70 includes: a power receiving coil 71 that generates induced power by the magnetic flux M of the power transmission coil 41; a mounting plate 81 on which the power receiving coil 71 is mounted; and a plurality of mounting rods 85 that mount the mounting plate 81 to the lower portion of the seat S.

[0072] The plurality of mounting rods 85 are formed in a substantially cylindrical shape and are provided on the lower surface of the seat base 37 in a state of extending downward from the seat S.

[0073] The mounting plate 81 is formed in a thin circular flat plate shape and is fixed to the lower surface of the plurality of mounting rods 85 by bolt fastening or the like so as to be arranged directly above the power transmission coil 41 of the power transmission unit 40 and face the power transmission coil 41 .

[0074] like Figure 5 As shown, the receiving coil 71 is formed by winding a winding wire and is fixed to the mounting plate 81. The receiving coil 71 can be fixed to the mounting plate 81 by a known fixing method such as joining the receiving coil 71 to the mounting plate 81 by ultrasonic welding or heat welding, or fixing the receiving coil 71 to the mounting plate 81 by an adhesive or bonding agent. In addition, the receiving coil 71 can be clamped and fixed in the vertical direction by the mounting plate 81 and a plate-shaped pressing portion (not shown).

[0075] like Figure 2 , Figure 4 and Figure 6As shown, the power receiving coil 71 includes: a first power receiving annular coil 72 which is long in the front-to-rear direction when the seat S is facing forward in the direction of travel of the vehicle; and a second power receiving annular coil 76 which is long in the front-to-rear direction on the side of the first power receiving annular coil 72.

[0076] like Figure 6 As shown, the power receiving first annular coil 72 is formed in an oblong shape, and includes a power receiving first extension portion 73 extending in the front-to-back direction along the power transmitting first extension portion 43 of the power transmitting unit 40, and a power receiving first outer extension portion 74 extending in the front-to-back direction in parallel with the power receiving first extension portion 73 and extending in the front-to-back direction along the power transmitting first outer extension portion 44.

[0077] The power receiving second annular coil 76 is formed in an oblong shape, and includes a power receiving second extension portion 77 extending in the front-to-back direction along the power receiving first extension portion 73 and extending in the front-to-back direction along the power transmitting second extension portion 47 of the power transmitting portion 40 , and a power receiving second outer extension portion 78 extending in the front-to-back direction parallel to the power receiving second extension portion 77 and extending in the front-to-back direction along the power transmitting second outer extension portion 48 .

[0078] In other words, if Figure 1 As shown in FIG. 1 , the power receiving first extension portion 73 and the power receiving second extension portion 77 are arranged directly above the power transmitting first extension portion 43 and the power transmitting second extension portion 47 via the mounting plate 81. Figure 7 As shown, the power receiving first extension portion 73 and the power receiving second extension portion 77 are arranged in the annular magnetic flux M1 centered around the power transmitting first extension portion 43 and the power transmitting second extension portion 47 .

[0079] As a result, in the power receiving first extension portion 73 and the power receiving second extension portion 77 , the magnetic field around the power receiving first extension portion 73 and the power receiving second extension portion 77 changes due to the magnetic flux M1 , and induced power is generated.

[0080] On the other hand, the power receiving first outer extension portion 74 is disposed directly above the power transmitting first outer extension portion 44 via the mounting plate 81, and is disposed within the magnetic flux M3 generated by the power transmitting first outer extension portion 44. Furthermore, the power receiving second outer extension portion 78 is disposed directly above the power transmitting second outer extension portion 48 via the mounting plate 81, and is disposed within the magnetic flux M4 generated by the power transmitting second outer extension portion 48. Therefore, in the power receiving first outer extension portion 74 and the power receiving second outer extension portion 78, as shown in FIG. Figure 7 As shown, the magnetic fields around the first power transmission outer extension portion 44 and the second power transmission outer extension portion 48 change, respectively, and induced power is generated.

[0081] In addition, if Figure 5 and Figure 6As shown in FIG. 1 , the length dimension of the power receiving coil 71 of the power receiving unit 70 in the front-to-back direction is less than the length dimension of the power transmitting coil 41 of the power transmitting unit 40 in the front-to-back direction, and the length dimension of the power receiving coil 71 in the left-to-right direction (direction orthogonal to the front-to-back direction) is set to be substantially the same as the length dimension of the power transmitting coil 41 of the power transmitting unit 40 in the left-to-right direction. Figure 8 As shown, the power receiving coil 71 rotates with the position where the power receiving first extension portion 73 of the power receiving first annular coil 72 and the power receiving second extension portion 77 of the power receiving second annular coil 76 are arranged as a fulcrum. That is, the power receiving first extension portion 73 and the power receiving second extension portion 77 of the power receiving coil 71 rotate along with the rotation of the seat S, and are arranged within the installation range where the power transmission coil 41 is installed even in the rotated state.

[0082] So, for example Figure 8 As shown in FIG. 1 , when the seat S is rotated 60 degrees (π / 3 radians) from the front direction, which is the traveling direction, to the left and right and 120 degrees (2π / 3 radians) as a whole by the rotating mechanism 35, the power receiving first extension portion 73 and the power receiving second extension portion 77 are shifted in the rotation direction relative to the power transmitting first extension portion 43 and the power transmitting second extension portion 47. However, the power receiving first extension portion 73 and the power receiving second extension portion 77 that receive electric power from the power transmitting first extension portion 43 and the power transmitting second extension portion 47 of the power transmitting unit 40 in the power receiving coil 71 are arranged within the installation range where the power transmitting coil 41 is installed. Moreover, in the power transmitting unit 40, the magnetic flux M1 of the power transmitting first extension portion 43 and the power transmitting second extension portion 47 efficiently reinforces each other.

[0083] That is, according to the present embodiment, even when the power receiving coil 71 is offset in the rotation direction relative to the power transmitting coil 41 as the seat S rotates, induced power can be generated in the power receiving first extension portion 73 and the power receiving second extension portion 77 by the mutually reinforcing magnetic flux M1 of the power transmitting first extension portion 43 and the power transmitting second extension portion 47.

[0084] This embodiment has the above-described configuration, and the operation and effects of the power supply device 10 will be described below.

[0085] For example, the power supply device has a power supply part uprightly arranged on the floor part of the vehicle cabin and a power receiving part arranged on the leg part of the seat, and the power supply part and the power receiving part are opposite to each other in the front-to-back direction. If a rotation function is provided on the seat, when the seat is slightly rotated, the power receiving part becomes not opposite to the power supply part, and power cannot be supplied from the power supply part to the power receiving part.

[0086] Therefore, the inventors have conducted careful studies to solve the above-mentioned problems and have found the structure of the present embodiment. That is, the present embodiment is a power supply device 10 for a seat S that can slide and rotate relative to a floor portion F of a vehicle, and includes a power transmission unit 40 that is provided on the floor portion F and extends along the front-rear direction (sliding direction) in which the seat S slides, and a power receiving unit 70 that is provided on the seat S and receives power from the power transmission unit 40 in a non-contact manner, wherein the length dimension of the power transmission unit 40 in the front-rear direction is set longer than the length dimension in the left-right direction orthogonal to the front-rear direction, and the portion (the first power receiving extension portion 73 and the second power receiving extension portion 77) of the power receiving unit 70 that receives power from the power transmission unit 40 is arranged in a state close to the power transmission unit 40 in the process of sliding and rotating movement of the seat S within the installation range of the power transmission unit 40.

[0087] The power transmission unit 40 includes a power transmission coil 41 formed by winding a winding wire, and the power reception unit 70 includes a power reception coil 71 formed by winding a winding wire and generating induced power by the magnetic flux M of the power transmission coil 41 .

[0088] Therefore, according to the power supply device 10 with such a structure, even when the seat S is sliding and rotating, the part of the power receiving unit 70 that receives power from the power transmission unit 40 is arranged in a state close to the power transmission unit 40 and within the setting range of the power transmission unit 40, so that the slidable and rotationally movable seat S can be supplied with contactless power by electromagnetic induction.

[0089] In addition, the power transmission coil 41 includes: a first power transmission annular coil 42 having a first power transmission extension portion 43 extending in the front-rear direction; and a second power transmission annular coil 46 having a second power transmission extension portion 47 extending in the front-rear direction along the first power transmission extension portion 43, and the direction of the current in the second power transmission extension portion 47 is the same as the direction of the current in the first power transmission extension portion 43. In addition, the power receiving coil 71 includes: a first power receiving annular coil 72 having a first power receiving extension portion 73 extending in the front-rear direction along the first power transmission extension portion 43 in a state where the seat S faces forward in the traveling direction of the vehicle; and a second power receiving annular coil 76 having a second power receiving extension portion 77 extending in the front-rear direction along the first power receiving extension portion 73 and the second power transmission extension portion 47, and the direction of the current in the second power receiving extension portion 77 is the same as the direction of the current in the first power receiving extension portion 73.

[0090] That is, according to such a structure, the magnetic flux M generated by the first power transmission annular coil 42 and the magnetic flux M generated by the second power transmission annular coil 46 are in opposite directions, and an annular magnetic flux M1 is generated with the portion where the first power transmission extension portion 43 and the second power transmission extension portion 47 are arranged as the center. As a result, the magnetic flux M1 of the first power transmission extension portion 43 and the second power transmission extension portion 47 of the power transmission unit 40 is mutually enhanced. And, the magnetic field around the first power receiving extension portion 73 and the second power receiving extension portion 77 of the power receiving unit 70 is changed by the enhanced magnetic flux M1, so that the induction power can be generated.

[0091] Therefore, according to such a configuration, for example, compared with a case where the power transmission coil and the power reception coil are configured in a circular shape to supply power, the efficiency of contactless power supply to the seat S can be improved.

[0092] However, generally, in the electromagnetic induction method, the magnetic flux M of the power transmission coil 41 of the power transmission unit 40 that is not linked with the power receiving coil 71 of the power receiving unit 70 and the magnetic flux radiated from the power transmission coil 41 to the outside are leakage magnetic flux M2. Therefore, when power is supplied to the power receiving unit 70 provided in the seat S by the magnetic flux M of the power transmission unit 40 provided in the floor portion F, the magnetic flux in the power transmission unit 40 may leak to the outside.

[0093] However, according to such a structure, the magnetic flux M generated by the first power transmission annular coil 42 and the magnetic flux M generated by the second power transmission annular coil 46 are in opposite directions. That is, the magnetic flux other than the portion where the first power transmission extension portion 43 and the second power transmission extension portion 47 are arranged is weakened by the magnetic flux M1A, which is a part of the magnetic flux M1 enhanced by the first power transmission extension portion 43 and the second power transmission extension portion 47, and the leakage magnetic flux M2 from the power transmission coil 41 can be suppressed.

[0094] Furthermore, since the first power transmission loop coil 42 and the second power transmission loop coil 46 are connected in series, the circuit configuration of the power transmission unit 40 can be simplified. Furthermore, the current of the first power transmission loop coil 42 and the current of the second power transmission loop coil 46 can be made the same.

[0095] That is, it is possible to easily make the magnetic flux M generated by the first power transmission annular coil 42 and the magnetic flux M generated by the second power transmission annular coil 46 have the same strength. Thus, for example, compared with a case where the magnetic flux generated by the first power transmission annular coil and the magnetic flux generated by the second power transmission annular coil are different, the magnetic flux M1 of the first power transmission extension portion 43 and the second power transmission extension portion 47 can be efficiently reinforced.

[0096] In addition, if Fig. 9 and Fig.10As shown in FIG. 1 , when the seat S is rotated 90 degrees (π / 2 radians) to the left or right orthogonal to the traveling direction of the vehicle, the power receiving first extension portion 73 and the power receiving second extension portion 77 are in a state of being orthogonal to the power transmitting first extension portion 43 and the power transmitting second extension portion 47. Therefore, although the effect of the magnetic flux M1 on the power receiving first extension portion 73 and the power receiving second extension portion 77 is weakened, induced power can be generated in the power receiving first extension portion 73 and the power receiving second extension portion 77.

[0097] Here, if Fig.10 As shown, the leakage magnetic flux M2 leaking from the magnetic flux M3 of the power transmission first outer extension portion 44 and the magnetic flux M4 of the power transmission second outer extension portion 48 is weakened by the magnetic flux M1A which is a part of the magnetic flux M1 enhanced in the power transmission first extension portion 43 and the power transmission second extension portion 47. That is, according to the present embodiment, even when the seat S is rotated 90 degrees, the leakage magnetic flux M2 from the power transmission coil 41 can be suppressed.

[0098] <Implementation Method 2>

[0099] Next, regarding Embodiment 2, refer to Fig.11 and Fig.12 Provide explanation.

[0100] The power receiving unit 170 of the second embodiment has an auxiliary power receiving coil 91 in addition to the power receiving coil 71 of the first embodiment, and the same configuration, operation, and effects as those of the first embodiment are omitted. The same reference numerals are used for the same configurations as those of the first embodiment.

[0101] like Fig.11 As shown, the auxiliary power receiving coil 91 in the power receiving unit 170 of the second embodiment has the same structure as the power receiving coil 71 and is arranged 90 degrees (π / 2 radians) away from the power receiving coil 71 around the positions of the first power receiving extension portion 73 and the second power receiving extension portion 77 .

[0102] In detail, Fig.12 As shown, the auxiliary power receiving coil 91 is formed into an oblong shape, and has: an auxiliary first annular coil 92 that is configured to be long in the left-right direction when the seat S is facing forward as the direction of travel of the vehicle; and an auxiliary second annular coil 96 that is configured to be long in the left-right direction on the side of the auxiliary first annular coil 92.

[0103] The auxiliary first annular coil 92 is formed in an oblong shape and has: an auxiliary first extension portion 93 extending in the left-right direction orthogonal to the power transmission first extension portion 43; and an auxiliary first outer extension portion 94 extending in the left-right direction in parallel with the auxiliary first extension portion 93 and orthogonal to the power transmission first outer extension portion 44.

[0104] The auxiliary second annular coil 96 includes an auxiliary second extension portion 97 extending in the left-right direction along the auxiliary first extension portion 93 and orthogonal to the power transmission second extension portion 47 , and an auxiliary second outer extension portion 98 extending in the left-right direction in parallel with the auxiliary second extension portion 97 and orthogonal to the power transmission second outer extension portion 48 .

[0105] In other words, in the power reception unit 170 of the present embodiment, the power reception coil 71 in the shape of a figure eight and the auxiliary power reception coil 91 in the shape of a figure eight are orthogonal to each other.

[0106] That is, according to the present embodiment, when the seat S is facing forward in the direction of travel of the vehicle, the mutually reinforcing magnetic flux M1 of the power transmitting first extension portion 43 and the power transmitting second extension portion 47 acts on the power receiving first extension portion 73 and the power receiving second extension portion 77, and induced power can be generated in the power receiving first extension portion 73 and the power receiving second extension portion 77.

[0107] On the other hand, when the seat S is rotated 90 degrees (π / 2 radians) to the left or right orthogonal to the traveling direction of the vehicle, the power receiving first extension portion 73 and the power receiving second extension portion 77 are in a state of being orthogonal to the power transmitting first extension portion 43 and the power transmitting second extension portion 47. Therefore, the magnetic flux M1 of the power transmitting first extension portion 43 and the power transmitting second extension portion 47 hardly acts on the power receiving first extension portion 73 and the power receiving second extension portion 77.

[0108] However, according to the present embodiment, when the seat S is rotated 90 degrees (π / 2 radians) to the left or right, the auxiliary first extension portion 93 and the auxiliary second extension portion 97 are arranged along the power transmission first extension portion 43 and the power transmission second extension portion 47 .

[0109] That is, the magnetic flux M1 of the power transmission first extension portion 43 and the power transmission second extension portion 47 acts on the auxiliary first extension portion 93 and the auxiliary second extension portion 97 , and induced power can be generated in the auxiliary first extension portion 93 and the auxiliary second extension portion 97 .

[0110] That is, according to the present embodiment, when the seat S faces forward, non-contact power is supplied through the power receiving coil 71, and when the seat S rotates 90 degrees (π / 2 radians) to the left or right orthogonal to the traveling direction, non-contact power is supplied through the auxiliary power receiving coil 91. That is, the combination of the power receiving coil 71 and the auxiliary power receiving coil 91 can suppress the decrease in power supply efficiency and supply power to the seat S. Furthermore, when the seat S rotates forward or in a direction other than the left and right direction, non-contact power is supplied to the seat S through both the power receiving coil 71 and the auxiliary power receiving coil 91.

[0111] <Implementation Method 3>

[0112] Next, regarding implementation mode 3, refer to Fig.13 and Fig.14 Provide explanation.

[0113] The power receiving unit 270 in the third embodiment has a plurality of auxiliary power receiving coils 91 in the second embodiment, and the configuration, operation, and effects common to those in the second embodiment are omitted because of duplication. The same reference numerals are used for the same configurations as those in the second embodiment.

[0114] like Fig.13 and Fig.14 As shown, the power receiving unit 270 of the third embodiment includes two auxiliary power receiving coils 91. In one of the two auxiliary power receiving coils 91, the auxiliary first extension portion 93 and the auxiliary second extension portion 97 are arranged to be offset by 120 degrees (2π / 3 radians) clockwise with respect to the power receiving first extension portion 73 and the power receiving second extension portion 77 of the power receiving coil 71. In the other of the two auxiliary power receiving coils 91, the auxiliary first extension portion 93 and the auxiliary second extension portion 97 are arranged to be offset by 240 degrees (4π / 3 radians) clockwise with respect to the power receiving first extension portion 73 and the power receiving second extension portion 77.

[0115] That is, the power reception unit 270 of the present embodiment has a structure in which a total of three power reception coils 71 and 91, namely, the power reception coil 71 in the shape of an 8 and two auxiliary power reception coils 91 in the shape of an 8, are stacked and shifted by 120 degrees (2π / 3 radians).

[0116] Therefore, when the seat S is rotated 60 degrees (π / 3) or 120 degrees (2π / 3 radians) to the left or right from the direction of travel of the vehicle, the auxiliary first extension portion 93 and the auxiliary second extension portion 97 of one of the two auxiliary power receiving coils 91 become along the power transmission first extension portion 43 and the power transmission second extension portion 47, and induced power can be generated in the auxiliary first extension portion 93 and the auxiliary second extension portion 97.

[0117] When the seat S is rotated 30 degrees (π / 6 radians) or 150 degrees (5π / 6 radians) to the left or right from the vehicle's traveling direction, contactless power supply can be performed by both the power receiving coil 71 and any of the auxiliary power receiving coils 91 .

[0118] That is, according to the present embodiment, no matter at which angle the seat S is rotated, a decrease in the efficiency of contactless power supply to the seat S can be suppressed, and contactless power supply to the seat S can be performed.

[0119] <Experimental Example 1>

[0120] Next, this embodiment will be described in more detail with reference to Experimental Example 1.

[0121] This experimental example Fig.15 The coordinate diagram of shows the transmission efficiency of the power receiving unit (the power receiving coil 71 is one) 70 in the first embodiment and the power receiving unit (the power receiving coil 71 and the auxiliary power receiving coil 91 are overlapped and shifted by 120 degrees (2π / 3 radians)) 270 in the third embodiment.

[0122] exist Fig.15 In the coordinate graph, the X-axis represents the rotation angle [°] of the power receiving coil 71 relative to the power transmitting coil 41, and the Y-axis represents the transmission efficiency [%] corresponding to the rotation angle of the power receiving coil 71. L1 represents the transmission efficiency of the power receiving unit 70 in the first embodiment, and L2 represents the transmission efficiency of the power receiving unit 270 in the third embodiment.

[0123] Here, refer to Fig.15 When the direction of the power receiving coil 71 is consistent with the direction of the power transmitting coil 41 in the power transmitting unit 40, a transmission effect with a transmission efficiency as high as 75% or more can be obtained in any of the first and third embodiments.

[0124] When the seat S is rotated and the power receiving coil 71 is rotated 30 degrees relative to the power transmitting coil 41 and shifted, the transmission efficiency of the first embodiment (L1) becomes 53%, and the transmission efficiency of the third embodiment (L2) becomes 75%. Furthermore, when the power receiving coil 71 is rotated 60 degrees relative to the power transmitting coil 41 and shifted, the transmission efficiency of the first embodiment (L1) becomes 20%, and the transmission efficiency of the third embodiment (L2) becomes 75%.

[0125] When the power receiving coil 71 is rotated 90 degrees and offset from the power transmitting coil 41 , the transmission efficiency in the first embodiment ( L1 ) becomes 5%, and the transmission efficiency in the third embodiment ( L2 ) becomes 75%.

[0126] That is, according to the structure of the first embodiment, the seat S can be powered with a high transmission efficiency of 50% or more until the power receiving unit 70 rotates 30 degrees and shifts to a position. Furthermore, according to the structure of the third embodiment, the seat S can be powered with a high transmission efficiency of 75% regardless of the direction in which the power receiving unit 270 rotates.

[0127] <Experimental Example 2>

[0128] Next, this embodiment will be described in more detail with reference to Experimental Example 2.

[0129] In this experimental example, the magnetic field distribution during power transmission of the power supply device 10 according to the first embodiment was confirmed using electromagnetic field analysis software.

[0130] exist Fig.16In the figure, A on the left side shows the magnetic field distribution during power transmission in Embodiment 1 and a cross section of the left half of the magnetic field distribution. B on the right side of the figure shows the magnetic field distribution during power transmission of the circular power transmission coil 341 and the circular power receiving coil 371 and a cross section of the right half of the magnetic field distribution.

[0131] exist Fig.16 In FIG. 1 , the arc-shaped lines shown outside the power receiving coils 71 and 371 and the power transmitting coils 41 and 341 indicate the position of the ICNIRP guideline value (27 μT (micro Tesla)).

[0132] That is, according to the power supply device 10 of the first embodiment, it is possible to suppress the influence of the leakage magnetic flux M2 of the power transmission unit 40 on the outside, compared with the power supply device having the circular power transmission coil 341 and the circular power reception coil 371 .

[0133] <Other Embodiments>

[0134] The technology disclosed in this specification is not limited to the embodiments described in the above description and drawings, and also includes various forms such as the following.

[0135] (1) In the above embodiment, the first power transmission loop coil 42 and the second power transmission loop coil 46 are connected in series. However, the present invention is not limited thereto, and the first power transmission loop coil and the second power transmission loop coil may be independent circuits.

[0136] (2) In the above-mentioned Embodiments 2 and 3, a configuration is adopted in which one or two auxiliary power receiving coils 91 are provided. However, the present invention is not limited thereto, and a configuration in which three or more auxiliary power receiving coils 91 are provided may be adopted.

[0137] (3) In the above embodiment, each of the annular coils 42, 46, 72, 76, 92, and 96 is configured in an oval shape. However, the present invention is not limited to this, and each annular coil may be configured in a semicircular shape or a polygonal shape.

[0138] Description of Reference Numerals

[0139] 10: Power supply device

[0140] 40: Power Transmission Department

[0141] 41: Transmission coil

[0142] 42: Transmission first toroidal coil

[0143] 43: The first extension of power transmission

[0144] 46: Transmission second toroidal coil

[0145] 47: Second extension of power transmission

[0146] 70: Receiving unit

[0147] 71: Receiving coil

[0148] 72: First power receiving ring coil

[0149] 73: Power receiving first extension part

[0150] 76: Power receiving second ring coil

[0151] 77: Power receiving second extension

[0152] 91: Auxiliary power receiving coil

[0153] 92: Auxiliary first toroidal coil

[0154] 93: Auxiliary first extension

[0155] 96: Auxiliary second toroidal coil

[0156] 97: Auxiliary second extension

[0157] F: Floor

[0158] S: Seat.

Claims

1. A power supply device for supplying power to a seat that can slide and rotate relative to a floor portion of a vehicle, The power supply device comprises: a power transmission portion, disposed on the floor portion and extending along a sliding direction of the seat; and A power receiving unit is provided on the seat and receives power from the power transmitting unit in a contactless manner. The power transmission unit is configured such that the length dimension in the sliding direction is longer than the length dimension in the direction perpendicular to the sliding direction. The seat is slidable in the front-rear direction relative to a pair of rails fixed to the floor portion. The power transmission unit is arranged to extend in the front-rear direction between the pair of rails. The power transmission unit includes a power transmission coil formed by winding a winding. The power transmission coil includes: a first power transmission loop coil having a long annular shape in the front-rear direction and a second power transmission loop coil having a long annular shape in the front-rear direction and arranged along a side edge of the first power transmission loop coil. A portion of the power receiving unit that receives power from the power transmitting unit is disposed within a setting range of the power transmitting unit in a state close to the power transmitting unit during the sliding and rotational movement of the seat.

2. The power supply device according to claim 1, wherein: The power receiving unit includes a power receiving coil formed by winding a winding and generating induced power by a magnetic flux of the power transmission coil.

3. A power supply device for supplying power to a seat that can slide and rotate relative to a floor portion of a vehicle, The power supply device comprises: a power transmission portion, disposed on the floor portion and extending along a sliding direction of the seat; and A power receiving unit is provided on the seat and receives power from the power transmitting unit in a contactless manner. The power transmission unit is configured such that the length dimension in the sliding direction is longer than the length dimension in the direction perpendicular to the sliding direction. The portion of the power receiving unit that receives power from the power transmitting unit is disposed within the installation range of the power transmitting unit in a state close to the power transmitting unit during the sliding and rotational movement of the seat. The power transmission unit includes a power transmission coil formed by winding a winding. The power receiving unit includes a power receiving coil formed by winding a winding and generating induced power by the magnetic flux of the power transmission coil. The power transmission coil comprises: A first power transmission annular coil having a first power transmission extension portion extending in a sliding direction; and The second power transmission annular coil has a second power transmission extension portion extending in a sliding direction along the first power transmission extension portion, and the direction of the current in the second power transmission extension portion is the same as the direction of the current in the first power transmission extension portion. The power receiving coil comprises: a first power receiving annular coil having a first power receiving extending portion extending in a sliding direction along the first power transmitting extending portion when the seat is facing the traveling direction of the vehicle; and The power receiving second annular coil has a power receiving second extending portion extending in a sliding direction along the power receiving first extending portion and the power transmitting second extending portion, and a direction of current in the power receiving second extending portion is the same as a direction of current in the power receiving first extending portion.

4. The power supply device according to claim 3, wherein: The first power transmission loop coil and the second power transmission loop coil are connected in series.

5. The power supply device according to claim 3 or 4, wherein: The power receiving unit includes at least one auxiliary power receiving coil formed by winding a winding and generating induced power by the magnetic flux of the power transmission coil. The auxiliary power receiving coil comprises: an auxiliary first annular coil having an auxiliary first extending portion extending in a direction intersecting the power receiving first extending portion; and The auxiliary second toroidal coil has an auxiliary second extending portion extending along the auxiliary first extending portion, and generates a magnetic flux in a direction different from that of the auxiliary first toroidal coil.

6. The power supply device according to claim 5, wherein: The auxiliary first extension portion extends in a direction orthogonal to the power receiving first extension portion. The auxiliary second extending portion extends in a direction orthogonal to the power receiving second extending portion.

7. The power supply device according to claim 5, wherein: The power receiving unit has a plurality of auxiliary power receiving coils. In each of the auxiliary power receiving coils, the auxiliary first extending portion of the auxiliary first loop coil is arranged to be offset from the auxiliary first extending portion and the power receiving first extending portion of the other auxiliary first loop coils in the rotation direction of the seat.

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