JP2012135108A - Feeding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feeding system that can supply power from a feeding section to a receiving section with high efficiency even if a feeding helical coil and a receiving helical coil experience a distance variation or a lateral shift.SOLUTION: A feeding section 3 installed on a road has a feeding loop antenna 6 supplied with power and a feeding helical coil 7 electromagnetically coupled to the feeding loop antenna 6. A receiving section 5 installed on an automobile has a receiving helical coil 8 electromagnetically resonant with the feeding helical coil 7, and a receiving loop antenna 9 electromagnetically coupled to the receiving helical coil 8. The receiving loop antenna 9 is divided into two L-shaped members 91, 92, and the L-shaped members 91, 92 can be moved for changes in contact position to implement a variable loop size.

Description

  The present invention relates to a power supply system, and more particularly to a power supply system that supplies power from a power supply coil to a power reception coil in a contactless manner.

  As the power feeding system described above, for example, the one shown in FIGS. 1 and 2 is known (Patent Document 1). As shown in the figure, the power feeding system 1 includes a power feeding unit 3 as a power feeding unit and a power receiving unit 5 as a power receiving unit. The power feeding unit 3 includes a power feeding side loop antenna 6 to which power is supplied and a power feeding side helical coil 7 as a power feeding side coil electromagnetically coupled to the power feeding side loop antenna 6. When power is supplied to the power feeding side loop antenna 6, the power is sent to the power feeding side helical coil 7 by electromagnetic induction.

  The power reception unit 5 includes a power reception side helical coil 8 that electromagnetically resonates with the power supply side helical coil 7 and a power reception side loop antenna 9 that is electromagnetically coupled to the power reception side helical coil 8. When power is sent to the power supply side helical coil 7, the power is wirelessly sent to the power receiving side helical coil 8 by magnetic field resonance.

  Further, when power is sent to the power receiving side helical coil 8, the power is sent to the power receiving side loop antenna 9 by electromagnetic induction and supplied to a load connected to the power receiving side loop antenna 9. According to the power feeding system 1 described above, electric power from the power feeding side can be supplied to the power receiving side in a non-contact manner by electromagnetic resonance between the power feeding side helical coil 7 and the power receiving side helical coil 8.

  Then, by providing the power receiving unit 5 described above in the automobile 4 and providing the power feeding unit 3 in the road 2 or the like, it is possible to supply power to the load mounted on the automobile 4 wirelessly using the power feeding system 1 described above. It is considered.

By the way, the distance between the power receiving unit 5 provided in the automobile 4 and the power feeding unit 3 provided on the road 2 varies depending on the type of the automobile 4. That is, the inter-coil distance L ₁ between the power-receiving-side helical coil 8 of the power-receiving unit 5 and the power-feeding-side helical coil 7 of the power feeding unit 3 is also different depending on the vehicle type. For example, when providing the power receiving unit 5 to the height of lower car, sports car, between the coil distance L ₁ is shortened, providing the power receiving unit 5 to the vehicle height high vehicle such as RV car, the distance between the coil L ₁ is longer.

Next, the inventors set the inter-coil distance L ₁ in a state where the antenna diameters R ₁₁ and R ₁₂ of the power feeding side and power receiving side loop antennas 6 and 9 of the power feeding system 1 shown in FIG. 1 are fixed to 206 mm. The passage characteristic S21 and the reflection characteristic S11 of the power receiving side loop antenna 9 when measured in the range of 100 mm to 400 mm were measured. The results are shown in FIGS.

As can be seen from Figure 21, when the distance between the coils L ₁ in the feeding system 1 described above is changed, passing characteristic S21 is fluctuated. The main cause is misalignment between the power supply side helical coil 7 and the power reception side helical coil 8, as shown in FIGS.

More specifically, assuming that the antenna diameters R ₁₁ and R ₁₂ of the power supply side loop antenna 6 and the power reception side loop antenna 9 are 206 mm, when the inter-coil distance L ₁ is 200 mm, the state is close to critical coupling. also bind to the inter-coil distance L ₁ is shorter and the power supply unit 3 and the power receiving unit 5 becomes dense, to indicate a bi-resonance characteristic, a change in frequency of passing characteristic S21 is a 1.

Therefore, when the operating frequency is fixed at around 13.5 MHz, when the inter-coil distance L ₁ is 200 mm, the pass characteristic S21 is almost 1 and high efficiency is obtained. However, when the inter-coil distance L ₁ is changed to 100 mm, the pass characteristic is increased. S21 falls to 0.65 and the loss increases.

In contrast, next loose binding to the inter-coil distance L ₁ is longer and the power supply side helical coil 7 and the power reception side helical coil 8, not take each other's impedance matching, passing characteristic S21 is increased loss decreases End up.

As apparent from the above, there was feed efficiency from the feeding unit 3 and the inter-coil distance L ₁ is varied to the power receiving unit 5 increases the loss fluctuates, a problem that is. Further, as shown in FIG. 19, when a lateral shift x in which the axes of the power feeding side loop antenna 6, the power feeding side helical coil 7, the power receiving side loop antenna 9, and the power receiving side helical coil 8 are shifted occurs, There is a problem that the power supply efficiency from 3 to the power receiving unit 5 fluctuates and the loss increases.

JP 2010-124522 A

  Therefore, the present invention provides a power feeding system that can supply power with high efficiency from the power feeding unit to the power receiving unit even if a variation in the distance between the power feeding side helical coil and the power receiving side helical coil or a lateral shift occurs. This is the issue.

  The invention according to claim 1 for solving the above-described problem includes a power feeding side loop antenna to which power is supplied, power feeding means provided with a power feeding side coil electromagnetically coupled to the power feeding side loop antenna, and the power feeding side. A power receiving system including a power receiving side coil that electromagnetically resonates with the coil and a power receiving side loop antenna that is electromagnetically coupled to the power receiving side coil, and at least one of the power feeding side loop antenna and the power receiving side loop antenna. One of the members is divided into a plurality of members, and the size of the loop is variably provided by moving the plurality of members to change the contact position with each other.

  The invention according to claim 2 resides in the power feeding system according to claim 1, wherein the plurality of members are overlapped with each other so as to form a loop.

  According to a third aspect of the present invention, a recess that is concave toward the center is provided at at least one end of the plurality of members, and an end of a member adjacent to the member provided with the recess is the recess. The power feeding system according to claim 1, wherein the power feeding system is slidably inserted into the power feeding system.

  According to a fourth aspect of the present invention, the driving means for driving the plurality of members, the distance measuring means for measuring the distance between the power feeding side loop antenna and the power receiving side loop antenna, and the distance measured by the distance measuring means 4. The power feeding system according to claim 1, further comprising: a driving control unit that controls the driving unit to drive the plurality of members so as to have a size of a loop. Exist.

  The invention according to claim 5 is a driving means for driving the plurality of members, a reflection measuring means for measuring a reflection amount at the power receiving side coil, and the driving means according to the reflection amount measured by the reflection measuring means. The power supply system according to any one of claims 1 to 3, further comprising: a drive control unit that drives the plurality of members by controlling the plurality of members.

  As described above, according to the first aspect of the present invention, at least one of the feeding-side loop antenna and the power-receiving-side loop antenna is divided into a plurality of members, and the plurality of members are moved so that the mutual contact positions are set. By changing it, the size of the loop was made variable. Since the efficiency varies when the size of the loop is changed, the distance between the power supply side loop antenna and the power reception side loop antenna can be changed by changing the size of the loop in accordance with the distance between the power supply side loop antenna and the power reception side loop antenna and the lateral displacement. Even if fluctuations or lateral deviations occur, power can be supplied with high efficiency.

  According to invention of Claim 2, since the both ends of several members are piled up and contacted mutually, the contact position of several members can be changed with simple structure.

  According to invention of Claim 3, the recessed part which becomes concave toward the center is provided in the at least one edge part among several members, and the edge part of the member adjacent to the member provided with the recessed part is a recessed part. Since it is slidably inserted, the contact positions of a plurality of members can be changed with a simple configuration.

  According to the fourth aspect of the present invention, the distance measuring means measures the distance between the power feeding side loop antenna and the power receiving side loop antenna, and the drive control means has a loop size corresponding to the distance measured by the distance measuring means. In this way, the driving means is controlled to drive a plurality of members, so that the size of the loop can automatically supply power with high efficiency even if the distance between the feeding loop antenna and the receiving loop antenna varies. be able to.

  According to the fifth aspect of the present invention, the reflection measuring unit measures the reflection amount of the power receiving side coil, and the drive control unit controls the driving unit according to the reflection amount measured by the reflection measuring unit, and the plurality of members. Therefore, even when a variation in the distance between the feeding-side loop antenna and the receiving-side loop antenna and a lateral deviation occur, the loop can be sized to automatically supply power with high efficiency.

It is a figure which shows one Embodiment of the electric power feeding system of this invention. (A) And (B) is the schematic perspective view and side view which respectively show the structure of the electric power feeding system shown in FIG. The distance between the coils _{L 1} of the power supply system shown in FIG. 1 is fixed to 300 mm, the feeding side and the antenna diameter _R 11 of the power receiving side loop _{antenna, R 12 103mm, 85mm,} the power receiving side loop antenna in the case of changing the 75mm It is a graph which shows the result of having measured passage characteristic S21. The distance between the coils _{L 1} of the power supply system shown in FIG. 1 is fixed to 300 mm, the feeding side and the antenna diameter _R 11 of the power receiving side loop _{antenna, R 12 103mm, 85mm,} the power receiving side loop antenna in the case of changing the 75mm It is a graph which shows the result of having measured reflection characteristic S11. The distance between the coils _{L 1} of the power supply system shown in FIG. 1 is fixed to 300 mm, the feeding side and the antenna diameter _R 11 of the power receiving side loop _{antenna, R 12 103mm, 85mm,} the power receiving side loop antenna in the case of changing the 75mm It is a Smith chart which shows the result of having measured reflection characteristic S11. Feeding side of the power supply system shown in FIG. 1, the power receiving side resonance frequency of the helical coil is fixed to 13.3MHz, the power feeding side, the power feeding side and power receiving side loop antenna in accordance with a variation in distance between the coils L ₁ of the power receiving helical coil is a graph showing the results of a pass characteristic S21 was measured of the power receiving side loop antenna when varying the antenna diameter R _11, R _12. Feeding side of the power supply system shown in FIG. 1, the power receiving side resonance frequency of the helical coil is fixed to 13.3MHz, the power feeding side, the power feeding side and power receiving side loop antenna in accordance with a variation in distance between the coils L ₁ of the power receiving helical coil it is a graph showing the results of measurement of the reflection characteristic S11 in the power receiving side loop antenna when varying the antenna diameter R _11, R _12. Feeding side of the power supply system shown in FIG. 1, the power receiving side resonance frequency of the helical coil is fixed to 26 MHz, the power feeding side, the antenna of the power feeding side and power receiving side loop antenna in accordance with a variation in distance between the coils L ₁ of the power receiving helical coil is a graph showing the results of a pass characteristic S21 was measured of the power receiving side loop antenna when changing the diameter R _11, R _12. Feeding side of the power supply system shown in FIG. 1, the power receiving side resonance frequency of the helical coil is fixed to 26 MHz, the power feeding side, the antenna of the power feeding side and power receiving side loop antenna in accordance with a variation in distance between the coils L ₁ of the power receiving helical coil is a graph showing the results of measurement of the reflection characteristic S11 in the power receiving side loop antenna when changing the diameter R _11, R _12. Pass characteristic when the antenna diameter R ₁₁ of the power feeding side loop antenna feed system shown in Figure 1 is fixed to 250 mm, varying the antenna diameter R ₁₂ only the power-receiving-side loop antenna in accordance with a variation in distance between the coils L ₁ It is a graph which shows the result of having measured S21. The diameter of the power feeding side loop antenna is fixed to 250 mm, is a graph showing the results of a reflection characteristic S11 was measured in the case of changing the antenna size R ₁₂ only the power-receiving-side loop antenna in accordance with a variation in distance between the coils L ₁ . It is a detailed top view of the power receiving side loop antenna in 1st Embodiment. In the power supply system shown in FIG. 1 is a graph showing the results of a pass characteristic S21 was measured when changing the length L ₃ of the power receiving side loop antenna shown in FIG. 12 in accordance with a variation in distance between the coils L _1. (A) is a top view of the power receiving side loop antenna in 2nd Embodiment, (B) is the II sectional view taken on the line of (A). It is a top view of the power receiving side loop antenna in 3rd Embodiment. It is a figure which shows the electric power feeding system in 4th Embodiment. It is a figure which shows the electric power feeding system in 5th Embodiment. It is a flowchart for demonstrating the process sequence of the control part which comprises the electric power feeding system shown in FIG. It is explanatory drawing for demonstrating the horizontal shift x. The distance between the coils _{L 1} the length of the power feeding side and power receiving side loop antenna is fixed to 200mm L2 103mm, 85mm, in Smith chart showing a result of the reflection characteristic S11 was measured of the power receiving side loop antenna in the case of changing the 75mm is there. Feeding side of the power supply system shown in FIG. 1, the power receiving side power receiving side loop antenna when changing the distance between the coils _{L 1} in the range of 100mm~400mm in a state where the antenna diameter _{R 11, R 12} and fixed to 206mm of the loop antenna It is a graph which shows the result of having measured the passage characteristic S21. Feeding side of the power supply system shown in FIG. 1, the power receiving side power receiving side loop antenna when changing the distance between the coils _{L 1} in the range of 100mm~400mm in a state where the antenna diameter _{R 11, R 12} and fixed to 206mm of the loop antenna It is a graph which shows the result of having measured the reflection characteristic S11. Feeding side of the power supply system shown in FIG. 1, the power receiving side power receiving side loop antenna when changing the distance between the coils _{L 1} in the range of 100mm~400mm in a state where the antenna diameter _{R 11, R 12} and fixed to 206mm of the loop antenna It is a Smith chart which shows the result of having measured the reflection characteristic S11.

1st Embodiment Hereinafter, the electric power feeding system of this invention in 1st Embodiment is demonstrated based on drawing. FIG. 1 is a diagram showing an embodiment of a power feeding system of the present invention. 2A and 2B are a schematic perspective view and a side view, respectively, showing the configuration of the power feeding system shown in FIG. As shown in the figure, the power supply system 1 includes a power supply unit 3 as a power supply unit provided on a road 2 and the like, and a power reception unit 5 as a power reception unit provided in an abdomen of an automobile 4 or the like. ing.

  As shown in FIGS. 1 and 2, the power feeding unit 3 includes a power feeding side loop antenna 6 to which power is supplied, a power feeding side helical coil 7 as a power feeding side coil electromagnetically coupled to the power feeding side loop antenna 6, and Is provided. The feeding-side loop antenna 6 is provided in a loop shape, and is arranged so that its axis is along the direction from the road 2 toward the abdomen of the automobile 4, that is, the vertical direction. The power feeding side loop antenna 6 is supplied with AC power from an AC power source (not shown).

  The power supply side helical coil 7 is configured, for example, by winding a winding in a coil shape having a diameter larger than the diameter of the power supply side loop antenna 6. The feeding-side helical coil 7 is arranged coaxially with the feeding-side loop antenna 6 on the automobile 4 side of the feeding-side loop antenna 6. In the present embodiment, the feeding-side loop antenna 6 is arranged on the same plane as the winding of the feeding-side helical coil 7 that is farthest from the automobile 4.

  As a result, the feeding-side loop antenna 6 and the feeding-side helical coil 7 are within a range where they are electromagnetically coupled to each other, that is, when AC power is supplied to the feeding-side loop antenna 6 and an alternating current flows, They are separated from each other within a range where an induced current is generated.

  The power reception unit 5 includes a power reception side helical coil 8 that electromagnetically resonates with the power supply side helical coil 7 and a power reception side loop antenna 9 that is electromagnetically coupled to the power reception side helical coil 8. The power receiving side loop antenna 9 is connected to a load such as an in-vehicle battery (not shown). The power receiving side loop antenna 9 is provided in a loop shape, and its axis is arranged along the direction from the belly portion of the automobile 4 toward the road 2, that is, along the vertical direction. Note that the power receiving side loop antenna 9 is shown as a circular loop in FIG. 2 for the sake of simplicity of explanation, but in actuality, it is as shown in FIGS. The configuration of the power receiving side loop antenna 9 shown in FIGS. 12, 14 and 15 will be described later.

  The power reception side helical coil 8 is provided in the same manner as the power supply side helical coil 7, and is composed of a coil having a diameter larger than that of the power supply side and the power reception side loop antennas 6 and 9. The power receiving side helical coil 8 is arranged coaxially with the power receiving side loop antenna 9 on the road 2 side of the power receiving side loop antenna 9. In the present embodiment, the power receiving side loop antenna 9 is disposed on the same plane as the winding of the power receiving side helical coil 8 farthest from the road 2.

  As a result, the power receiving side loop antenna 9 and the power receiving side helical coil 8 are within a range where they are electromagnetically coupled to each other, that is, within a range where an induction current is generated in the power receiving side loop antenna 9 when an alternating current flows through the power receiving side helical coil 8. Are spaced apart from each other.

  According to the power supply system 1 described above, when the automobile 4 approaches the power supply unit 3 and the power supply side helical coil 7 and the power reception side helical coil 8 face each other with an interval in the axial direction, the power supply side helical coil 7 and the power reception system receive power. The side helical coil 8 can electromagnetically resonate, and power can be supplied from the power feeding unit 3 to the power receiving unit 5 in a contactless manner.

  More specifically, when AC power is supplied to the power supply side loop antenna 6, the power is sent to the power supply side helical coil 7 by electromagnetic induction. When power is sent to the power supply side helical coil 7, the power is wirelessly sent to the power receiving side helical coil 8 by magnetic field resonance. Further, when power is sent to the power receiving side helical coil 8, the power is sent to the power receiving side loop antenna 9 by electromagnetic induction and supplied to a load connected to the power receiving side loop antenna 9.

Next, the principle of the power feeding system 1 of the present invention will be described before describing the detailed configuration of the power feeding system 1 described above. First, in order to investigate the influence of the diameter fluctuations of the power supply side and power reception side loop antennas 6 and 9 on the pass characteristic S21 and the reflection characteristic S11, the inventors of the present invention are the coils of the power supply side helical coil 7 and the power reception side helical coil 8. between the distance _{L 1} is fixed to 300 mm, the power feeding side, the antenna diameter _{R 11, R 12} of the power receiving side loop antenna 6, 9 103 mm, 85 mm, were measured pass characteristic S21 and reflection characteristic S11 in case of changing the 75mm . The results are shown in FIGS. As shown in the figure, the feed side, varying the antenna diameter _{R 11, R 12} of the power receiving side loop antenna 6,9, the distance between the coils _{L 1} also pass characteristic S21 and reflection characteristic S11 is changed to a fixed I found out that

Specifically, when the antenna diameters R ₁₁ and R ₁₂ of the power supply side and power reception side loop antennas 6 and 9 are increased, the coupling between the power supply unit 3 and the power reception unit 5 is changed in a sparse direction to increase the loss and to be decreased. It has been found that the coupling changes in the dense direction and exhibits a bi-resonant characteristic. From this, when the inter-coil distance L ₁ is shortened and the coupling becomes dense, the coupling is made sparse by increasing the antenna diameters R ₁₁ and R ₁₂ of the loop antennas 6 and 9 on the power feeding side and the power receiving side. direction, if the coupling becomes sparse longer coil distance L ₁ is the power supply side, the direction of the tight binding by reducing the antenna diameter R _11, R ₁₂ of the power receiving side loop antenna 6,9 It has been found that it is sufficient to control the operation in the vicinity of the boundary coupling.

Next, the inventors of the present invention have a passage characteristic S21 and a reflection characteristic S11 when the antenna diameters R ₁₁ and R ₁₂ of the power supply side and power reception side loop antennas 6 and 9 are changed in accordance with the change in the inter-coil distance L _1. Was measured. The results are shown in FIGS. In the measurement shown in FIGS. 6 and 7, are set as shown in Table 1 shown below is a distance between the coils L ₁ and the antenna diameter R _11, R _12.

In the measurement shown in FIGS. 3 to 7 described above, the power supply side and power reception side helical coils 7 and 8 have diameters R ₂₁ and R ₂₂ of 294 mm, a number of turns of 6.5, a length of L ₂₁ and L. ₂₂ is 52 mm.

As shown in the figure, even if the inter-coil distance L ₁ varies, the efficiency and frequency can be kept constant by changing the antenna diameters R ₁₁ and R ₁₂ of the power supply side and power reception side loop antennas 6 and 9. Can do. That is, it is possible to inter-coil distance _{L 1} is obtained with high efficiency in the vicinity even frequency 13.3MHz vary.

However, as the inter-coil distance L ₁ increases, the high-efficiency band tends to be narrowed. Therefore, when the inter-coil distance L ₁ increases beyond a certain level, the efficiency also decreases. Thus, a certain frequency (e.g., 13.3MHz) with high efficiency has been optimally designed so as to obtain the power feeding side, the use of the power-receiving-side helical coil 7,8, also the distance between the coils L ₁ is varied, It has been found that high efficiency can be maintained by changing the antenna diameters R ₁₁ and R ₁₂ of the power supply side and power reception side loop antennas 6 and 9.

In order to investigate whether or not the above characteristics can be obtained even if the resonance frequency changes, the inventors set the number of turns of the helical coils 7 and 8 on the power supply side and the power reception side to 3 and sets the resonance frequency to around 26 MHz, and the distance between the coils. The passage characteristic S21 and the reflection characteristic S11 when the antenna diameters R ₁₁ and R ₁₂ of the power feeding side and power receiving side loop antennas 6 and 9 were varied according to the variation of L ₁ were measured. The results are shown in FIGS. 8 and 9, the inter-coil distance L ₁ and the antenna diameters R ₁₁ and R ₁₂ are set as shown in Table 2 below.

In the measurements shown in FIGS. 8 and 9, since the number of turns of the power supply side and power reception side helical coils 7 and 8 is 3, the lengths L ₂₁ and L ₂₂ are 24 mm. 3 to 7 are the same.

As shown in the figure, even when the resonance frequency 26 MHz, the power feeding side coil distance L ₁ is varied, by changing the diameter of the power receiving side loop antenna 6, 9, and efficiency and frequency constant Can be kept in. That is, it is possible to inter-coil distance L ₁ is obtained with high efficiency in the vicinity even frequency 26MHz vary.

As described in the prior art, for example, in the case of power feeding from the power supply unit 3 installed on the road 2 to the power receiving portion 5 disposed on the ventral part of the car 4, the distance between the coils L ₁ thereof varies depending on the model (sports car Is low and RV is high). Therefore, in general, it is conceivable to provide power supply side and power reception side loop antennas 6 and 9 having different sizes for each vehicle type, but this increases the types of power supply side and power reception side loop antennas 6 and 9. There is a problem with cost.

  In the present embodiment, the power receiving unit 5 including the power receiving side loop antenna 9 that is adjusted to a size such that high efficiency can be obtained at the manufacturing stage, for example, using the power receiving side loop antenna 9 having a variable loop size. Install. As a result, power can be supplied with high efficiency using the common power receiving side loop antenna 9 regardless of the vehicle type, and the cost can be reduced without increasing the number of types of the power receiving side loop antenna 9. A structure in which the size of the power receiving loop antenna 9 is variable will be described later.

To power the power receiving unit 5 installed from the power supply unit 3 installed on the road 2 in the abdominal portion of the car 4 as described above, the distance between the coils L ₁ is the differ depending on the model, provided in an automobile 4 It is desirable to change only the size of the power receiving side loop antenna 9 and to keep the size of the power feeding side loop antenna 6 provided on the road 2 side constant. Accordingly, the present inventors have found that when the antenna diameter R ₁₁ of the power feeding side loop antenna 6 is fixed to 250 mm, varying the coil radius R ₁₂ only the power-receiving-side loop antenna 9 in accordance with a variation in distance between the coils L ₁ The transmission characteristic S21 and the reflection characteristic S11 were measured. The results are shown in FIGS.

As shown in the figure, by also securing the antenna diameter R ₁₁ of the power feeding side loop antenna 6 to change the antenna diameter R ₁₂ of the power receiving side loop antenna 9, a high efficiency coil distance L ₁ fluctuates It turned out that power can be supplied with. In this case, since the fluctuation values of the antenna diameters R ₁₁ and R ₁₂ are required to be larger than when the antenna diameters R ₁₁ and R ₁₂ of both the power feeding side and the power receiving side loop antennas 6 and 9 are changed, it is possible to cope with it. a variation width of the inter-coil distance L ₁ is considered to be narrow. Further, compared to the case where the antenna diameters R ₁₁ and R ₁₂ of both the power feeding side and power receiving side loop antennas 6 and 9 are changed, the bandwidth with high efficiency tends to be slightly narrowed.

Next, a detailed configuration of the power receiving side loop antenna 9 of the present invention will be described with reference to FIG. As shown in FIG. 12, the power receiving side loop antenna 9 is composed of L-shaped members 91 and 92 that divide the square loop into two. The L-shaped members 91 and 92 are provided in the shape of a band plate having the same shape and the same size. These L-shaped members 91 and 92 are in contact with each other so as to form a square loop. According to the power receiving side loop antenna 9, the length L ₃ , that is, the size of the loop is made variable by moving the L-shaped members 91 and 92 on the diagonal line of the square loop as indicated by the arrow Y1. Can do.

These L-shaped members 91 and 92, the length _{L 3} in accordance with the vehicle type is adjusted by moving the L-shaped members 91 and 92 in the manufacturing stage along arrow Y1. And in order to keep the electrical characteristics of the contact portion good, it is desirable to hold the portion where the L-shaped members 91 and 92 overlap each other with fingers or the like.

In the case of the power receiving side loop antenna 9 shown in FIG. 12 described above, there is a concern that a portion protruding from the loop may adversely affect the characteristics. Accordingly, the present inventors have to investigate the adverse effects thereof were measured transmission characteristics S21 in the case of varying the length L ₃ of the power receiving loop antenna 9 shown in FIG. 12 in accordance with a variation in distance between the coils L ₁ . The results are shown in FIG. In the measurement of FIG. 13, the inter-coil distance L ₁ and the length L ₃ are set as shown in Table 3 below.

As is apparent from the figure, even if the distance between the coils L ₁ fluctuates efficiency can be kept constant frequency, was found not given bad influence any by a portion jumped out loop.

  In the above-described embodiment, the power receiving-side loop antenna 9 is composed of two L-shaped members 91 and 92 provided in a band plate shape and an L shape, and is overlapped with each other so that a loop is formed. Although the size of the power receiving side loop antenna 9 is variably provided, the present invention is not limited to this. The power receiving side loop antenna 9 may be any member as long as it is provided with a plurality of members that divide the loop and the size of the power receiving side loop antenna 9 can be changed by moving each member. The four receiving members may be overlapped with each other so as to form a square loop, and the size of the power receiving side loop antenna 9 may be variably provided.

Second Embodiment Next, a second embodiment will be described. The major difference between the first embodiment and the second embodiment is the configuration of the power receiving side loop antenna 9. In the first embodiment described above, the power receiving side loop antenna 9 is composed of two L-shaped members 91 and 92. In the second embodiment described above, as shown in FIG. It consists of members 93-96.

  Both ends of the L-shaped members 93 and 95 are provided thicker than the central portion, and further, a concave portion 9A that is concave toward the central portion is provided. Further, both ends of the L-shaped members 94 and 96 adjacent to the L-shaped members 94 and 96 are slidably inserted into the concave portion 9A. As described above, when both ends of the L-shaped members 94 and 96 are inserted into the concave portions 9A provided at both ends of the L-shaped members 93 and 95, a square loop is formed.

Further, by sliding the ends of the L-shaped portion 94, 96 in the recess 9A, it is possible to a square loop length L ₃ in the variable. Also in this case, it is desirable to hold both ends of the L-shaped members 93 and 95 into which both ends of the L-shaped members 94 and 96 are inserted by fingers or the like in order to keep the electrical characteristics of the contact portion good.

Third Embodiment Next, a third embodiment will be described. A significant difference between the first embodiment and the third embodiment is the configuration of the power receiving side loop antenna 9. In the second embodiment described above, the power receiving side loop antenna 9 is composed of two L-shaped members 91 and 92. However, in the third embodiment, as shown in FIG. And 98 constitute a power receiving loop antenna 9.

  Further, one ends of the semicircular arc members 97 and 98 are overlapped with each other and further connected by a hinge 10 in that state. That is, the semicircular arc members 97 and 98 are provided to be rotatable around the hinge 10. Further, the other ends of the semicircular arc members 97 and 98 are simply overlapped as in the first embodiment described above.

  According to the above configuration, when the other end of the semicircular arc member 97 is moved to the left side of the drawing and the other end of the semicircular arc member 98 is moved to the right side of the drawing, the size of the circular loop is reduced. When the other end of 97 is moved to the right side of the drawing and the other end of the semicircular arc member 98 is moved to the left side of the drawing, the size of the circular loop increases. Also in this case, in order to keep the electrical characteristics of the contact portion good, it is desirable to hold the semi-arc-shaped members 94 and 96 with both ends of the semi-arc-shaped members 94 and 96 sandwiched by fingers or the like.

Fourth Embodiment Next, a fourth embodiment will be described. In the embodiment described above, the size of the power reception side loop antenna 9 is adjusted for each vehicle type at the manufacturing stage. However, in the fourth embodiment, as shown in FIG. a driving unit 10 of the Jo members 91-96 and semicircular member 97, 98 as a driving means such as a motor for driving each of the distance measuring unit 11 of the distance measuring means for measuring the distance between the coils L _1, the provided The control unit 12 serving as drive control means such as a CPU controls the drive unit 10 so as to have a loop size corresponding to the inter-coil distance L ₁ measured by the distance measuring unit 11 to control these L-shaped members 91 to 91. It is also conceivable to drive 96, semicircular arc members 97, 98.

This makes it possible to coil distance L ₁ of the feed-side loop antenna 7 and the power receiving side loop antenna 9 is the size of the loop can be supplied with power automatically efficient be varied. In addition, as the distance measurement part 11, it is possible to use infrared rays, UWB radio | wireless, etc., for example. As a result, the size can be automatically set so that power can be supplied with high efficiency.

Fifth Embodiment Next, a fifth embodiment will be described. In the fourth embodiment described above, the distance measuring unit 11 in accordance with the distance between the coils L ₁ measured by the L-shaped member 91 to 96, had been driving the semicircular member 97 and 98, in the fifth embodiment 17, instead of the distance measuring unit 11, a reflection measuring unit 13 for measuring the reflection amount of the power receiving side helical coil 8 is provided, and the reflection characteristic S21 measured by the reflection measuring unit 13 by the control unit 12 is good. It is also conceivable to drive the L-shaped members 91 to 96 and the semicircular arc-shaped members 97 and 98 by controlling the driving unit 10 so as to be. The reflection measurement unit 13 described above is a device that measures the power sent to the power-receiving-side helical coil 8 and obtains the amount of reflection from the measured power. For example, a directional coupler or a circulator may be used. .

  Next, detailed operation of the control unit 12 described above will be described below with reference to FIG. First, when the control unit 12 detects that the power supply from the power supply unit 3 is started from the power supplied to the power receiving side helical coil 8 measured by the reflection measurement unit 13, the control unit 12 starts a loop control process. First, the control unit 12 takes in the reflection amount obtained by the reflection measurement unit 13 (step S1), and determines whether or not the reflection amount is equal to or less than a certain amount (step S2). If the amount of reflection is below a certain amount (Y in step S2), the control unit 12 returns to step S1 again. On the other hand, if the amount of reflection exceeds a certain amount (N in step S2), the control unit 12 controls the drive unit 10 to increase the loop in the direction of increasing the L-shaped members 91 to 96, semicircle. The arcuate members 97 and 98 are moved (step S3).

  Next, the control unit 12 takes in the reflection amount again (step S4), and determines whether or not the reflection amount has decreased as a result of moving in step S3 (step S5). If the amount of reflection has decreased (Y in Step S5), the control unit 12 determines whether or not the amount of reflection has become a certain amount or less as a result of the decrease in the amount of reflection (Step S6). If the amount of reflection is below a certain amount (Y in step S6), the control unit 12 returns to step S1 again.

In contrast, the reflection amount exceeds the predetermined amount (N at step S6), and the control unit 12 determines that the bond is too short coil distance L ₁ is still tight, again The drive unit 10 is controlled to move the L-shaped members 91 to 96 and the semicircular arc members 97 and 98 in the direction in which the loop becomes larger (step S7). Thereafter, the control unit 12 captures the reflection amount again (step S8), and repeats the operation of step S7 until the captured reflection amount becomes equal to or less than a predetermined amount. When the amount of reflection captured in step S8 is less than or equal to a certain amount (Y in step S9), the control unit 12 returns to step S1 again.

In contrast, if the amount of reflection has been reduced (N in step S5), and the control unit 12 determines that the coupling coil distance L ₁ is too long it is the state of the sparse, conversely driver 10 is controlled to move the L-shaped members 91 to 96 and the semicircular arc members 97 and 98 in the direction in which the loop becomes smaller (step S10). Thereafter, the control unit 12 captures the amount of reflection again (step S11), and repeats the operation of step S10 until the captured amount of reflection becomes a certain amount or less. When the amount of reflection captured in step S11 becomes a certain amount or less (Y in step S12), the control unit 12 returns to step S1 again. According to the fifth embodiment described above, the size can be automatically set so that power can be supplied with high efficiency.

  In the above-described embodiment, the reduction in efficiency due to a change in distance is prevented, but the present invention is not limited to this. For example, as shown in FIG. 19, the characteristic change due to the variation of the positional deviation x between the axis of the power supply side loop antenna 6 and the power supply side helical coil 7 and the axis of the power reception side loop antenna 9 and the power supply side helical coil 7 is also caused. Can respond.

The present inventors to confirm the above effect, in response to variation of the lateral deviation x (FIG. 19) to fix the distance between the coils L ₁ to 200 mm, the length of the power receiving side loop antenna 9 shown in FIG. 12 when the L ₃ is varied to measure the reflection characteristic S21. The results are shown in FIG. In the measurement of FIG. 20, the lateral deviation x and the length L ₃ are set as shown in Table 4 below. As can be seen from the figure, the efficiency and frequency can be kept constant by changing the sizes of the power-feeding and power-receiving-side loop antennas 6 and 9 even if a lateral shift x occurs. Therefore, according to the fifth embodiment described above, by controlling the size of the loop to the reflection amount becomes constant amount or less, it can accommodate both variations in the distance between the coils L ₁ and the horizontal displacement variation I understood.

Further, according to the embodiment described above, corresponded to the variations in the distance between the coils L ₁ by changing the antenna diameter R ₁₂ of only the power receiving side loop antenna 9, the present invention is not limited thereto. For example, only the antenna diameter R ₁₁ of the power supply side loop antenna 6 may be changed, or the antenna diameters R ₁₂ of both the power reception side loop antenna 9 and the power supply side loop antenna 6 may be changed.

  Further, although the above-described power supply system 1 is applied as a system for supplying power to the automobile 4, the present invention is not limited to this. You may make it apply to another system.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Power Supply System 3 Power Supply Unit (Power Supply Means)
5 Power receiving unit (power receiving means)
6 Feeding side loop antenna 7 Feeding side helical coil (feeding side coil)
8 Receiving side helical coil (Receiving side coil)
9 Receiving-side loop antenna 10 Drive unit (drive means)
11 Distance measuring unit (distance measuring means)
12 Control unit (drive control means)
91-96 L-shaped member (member)
97, 98 Semicircular arc member (member)

Claims (5)

A power feeding means provided with a power feeding side loop antenna to which power is supplied, a power feeding side coil electromagnetically coupled to the power feeding side loop antenna, a power receiving side coil that electromagnetically resonates with the power feeding side coil, and an electromagnetic coupling to the power receiving side coil A power receiving system provided with a power receiving side loop antenna,
At least one of the feeding-side loop antenna and the power-receiving-side loop antenna is divided into a plurality of members, and the size of the loop is variably provided by moving the plurality of members to change the mutual contact position. A power supply system characterized by this. The power supply system according to claim 1, wherein the plurality of members are overlapped with each other so as to form a loop. A recess that is concave toward the center is provided at at least one end of the plurality of members,
The power feeding system according to claim 1, wherein an end of a member adjacent to the member provided with the recess is slidably inserted into the recess. Driving means for driving the plurality of members;
Distance measuring means for measuring the distance between the power feeding side loop antenna and the power receiving side loop antenna;
Drive control means for driving the plurality of members by controlling the drive means so as to have a loop size corresponding to the distance measured by the distance measurement means;
The power feeding system according to any one of claims 1 to 3, further comprising: Driving means for driving the plurality of members;
Reflection measurement means for measuring the amount of reflection at the power receiving coil;
Drive control means for driving the plurality of members by controlling the drive means according to the amount of reflection measured by the reflection measurement means;
The power feeding system according to any one of claims 1 to 3, further comprising:

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