JP2011160496A - Power-transmitting device, power-receiving device, and power transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power-transmitting device for transmitting power with high transmission efficiency even if a transmission distance between a power transmission resonance coil and a power receiving resonance coil is changed, and to provide a power-receiving device and a power transmission system. <P>SOLUTION: In the power-transmitting device 24, a position of the center of gravity O2 of a power transmission pickup coil 23 is adjusted, thus changing a state of magnetic flux passing through the inside of an outer enclosure of the power transmission pickup coil 23 in magnetic flux generated by the power transmission resonance coil 22, and hence increasing or decreasing a boosting ratio of the power transmission resonance coil 22 to the power transmission pickup coil 23 to adjust an impedance ratio of the power-transmitting device 24. In the power-transmitting device 24, the impedance of the power transmission pickup coil 23 seen from the power transmission resonance coil 22 is adjusted by changing the state (interlinkage state) of the magnetic flux passing through the inside of the outer enclosure of the power transmission pickup coil 23, thus maintaining high transmission efficiency η. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power transmission device, a power reception device, and a power transmission system, and is suitable for application to, for example, a power transmission system that can wirelessly transmit power from a power transmission device to a power reception device.

  In recent years, it has been confirmed by the Massachusetts Institute of Technology (MIT) that non-contact power can be transmitted from a power transmission device to a power reception device using a resonance phenomenon caused by a magnetic field (see, for example, Non-Patent Document 1). In this way, in the power transmission system that transmits power from the power transmission device to the power receiving device using the resonance phenomenon of the magnetic field, power can be transmitted from the power transmission device to the power receiving device as compared with the contactless power feeding technology using electromagnetic induction. It has been confirmed that the transmission distance can be increased, and power can be transmitted with high transmission efficiency even when the distance is several meters, for example.

Kurs, A. et al .: “Wireless Power Transfer via Strongly Coupled Magnetic Resonances”, Science Magazine, Vol.317, No.5834 pp.83-86 (2007)

  However, in the power transmission system having such a configuration, when the transmission distance between the power transmission resonance coil of the power transmission device and the power reception resonance coil of the power reception device is shifted from the optimum distance, the mutual reactance changes accordingly, and as a result, on the power source side In a power receiving device on the load side as seen from a certain power transmitting device, there is a problem that the impedance changes according to the transmission distance, and the transmission efficiency rapidly decreases.

  Therefore, the present invention has been made in consideration of the above points. A power transmission device, a power reception device, and a power transmission system that can maintain high transmission efficiency even when the transmission distance between the power transmission resonance coil and the power reception resonance coil changes. The purpose is to propose.

  In order to solve this problem, claim 1 of the present invention provides a power transmission resonance coil that is magnetically coupled to a power reception resonance coil of a power reception device by resonance of a magnetic field and transmits power to the power reception resonance coil, and electromagnetic induction or magnetic field A power transmission pickup coil that causes the power transmission resonance coil to receive power by resonance, and the power transmission pickup coil changes the linkage state of the magnetic flux generated in the power transmission resonance coil, so that the power transmission resonance coil viewed from the power transmission resonance coil The impedance of the power transmission pickup coil is adjusted.

  According to a second aspect of the present invention, at least one of the power transmission resonance coil and the power transmission pickup coil is moved in a predetermined direction, and a distance between the center of gravity of the power transmission resonance coil and the center of gravity of the power transmission pickup coil is determined. By changing, the linkage state of magnetic flux in the power transmission pickup coil is changed.

  According to a third aspect of the present invention, the power transmission pickup coil is disposed in a winding region of the power transmission resonance coil, and the power transmission resonance coil and the power transmission pickup coil are disposed on the same plane. It is what.

  According to a fourth aspect of the present invention, the power transmission pickup coil is arranged such that a winding region of the power transmission pickup coil is disposed so as to face a winding region of the power transmission resonance coil. Is arranged with a predetermined interval.

  According to a fifth aspect of the present invention, there is provided an insertion member having dielectricity and / or permeability, and the insertion member is changed in position with respect to the power transmission resonance coil and the power transmission pickup coil. .

  According to a sixth aspect of the present invention, a capacitor is provided in the power transmission resonance coil and / or the power transmission pickup coil.

  According to a seventh aspect of the present invention, a power receiving resonance coil that is magnetically coupled to a power transmission resonance coil of a power transmission device by magnetic field resonance and receives power from the power transmission resonance coil, and the power reception by electromagnetic induction or magnetic field resonance. A power receiving pickup coil that receives power from the resonance coil, and the power receiving pickup coil changes the linkage state of the magnetic flux generated in the power receiving resonance coil, so that the power receiving pickup coil viewed from the power receiving resonance coil The impedance is adjusted.

  According to an eighth aspect of the present invention, at least one of the power receiving resonance coil and the power receiving pickup coil is moved in a predetermined direction, and a distance between the center of gravity of the power receiving resonance coil and the center of gravity of the power receiving pickup coil is determined. By changing, the linkage state of magnetic flux in the power receiving pickup coil is changed.

  According to a ninth aspect of the present invention, the power receiving pickup coil is disposed in a winding region of the power receiving resonance coil, and the power receiving resonance coil and the power receiving pickup coil are disposed on the same plane. It is what.

  According to a tenth aspect of the present invention, the power receiving pickup coil is arranged such that a winding region of the power receiving pickup coil is disposed so as to face a winding region of the power receiving resonant coil. Is arranged with a predetermined interval.

  The eleventh aspect of the present invention includes an insertion member having dielectricity and / or permeability, wherein the insertion member is changed in position with respect to the power reception resonance coil and the power reception pickup coil. .

  According to a twelfth aspect of the present invention, a capacitor is provided in the power receiving resonance coil and / or the power receiving pickup coil.

  In addition, according to a thirteenth aspect of the present invention, in the power transmission system in which power is transmitted from the power receiving device to the power transmitting device by magnetic field resonance, the power transmitting device is any one of the first to sixth aspects. The power reception device is the power transmission device according to any one of claims 7 to 12.

  According to a fourteenth aspect of the present invention, the position of the power receiving pickup coil with respect to the power receiving resonant coil in the power receiving device and the position of the power transmitting pickup coil with respect to the power transmitting resonant coil in the power transmitting device are adjusted to be the same state. Yes. It is characterized by this.

  According to the power transmission device of the first aspect of the present invention, the state of linkage of the magnetic flux in the power transmission pickup coil is changed, and accordingly, the step-up ratio between the power transmission pickup coil and the power transmission resonance coil is increased or decreased. The impedance ratio of the coil can be adjusted, and thus high transmission efficiency can be maintained by adjusting the impedance ratio.

  According to the power receiving device of claim 7 of the present invention, the impedance of the power receiving resonance coil is changed by changing the linkage state of the magnetic flux in the power receiving pickup coil and increasing or decreasing the step-up ratio between the power receiving pickup coil and the power receiving resonance coil. The ratio can be adjusted, and thus high transmission efficiency can be maintained by adjusting the impedance ratio.

  According to the power transmission system of the thirteenth aspect of the present invention, the linkage state of the magnetic flux in the electric pickup coil and the linkage state of the magnetic flux in the power receiving pickup coil are changed, and accordingly, the power transmission pickup coil and the power transmission resonance coil are changed. And the boost ratio of the power receiving pickup coil and the power receiving resonance coil can be increased or decreased to adjust the impedance ratio of the power transmission resonance coil and the power reception resonance coil, and thus the impedance ratio can be adjusted. High transmission efficiency can be maintained.

It is the schematic which shows the whole structure of a conventional system. It is a block diagram which shows the circuit structure of the equivalent circuit of a conventional system. It is the schematic of the conventional system with which it uses for description of transmission efficiency. It is a graph which shows the relationship between frequency ratio, impedance ratio, and transmission efficiency. It is the schematic where it uses for description of relative distance. It is a graph which shows the relationship between a frequency ratio when a relative distance and a coupling coefficient change, an impedance ratio, and transmission efficiency. It is the schematic which shows the whole structure of the electric power transmission system in this invention. It is the schematic which shows the structure of a power transmission resonance coil and a power transmission pickup coil, and the structure of a power reception resonance coil and a power reception pickup coil. It is the schematic which shows the whole structure of the electric power transmission system used for verification. It is the schematic which shows a structure when connecting a power transmission apparatus and a power receiving apparatus to the spectrum analyzer with a tracking generator. It is a graph which shows the relationship between a relative distance, a coupling coefficient, and transmission efficiency. It is a graph which shows the relationship between a relative distance, a pickup coil position, and an impedance ratio. It is a graph which shows the relationship between the transmission efficiency at the time of no control, the time of one-side control, and the time of both-sides control, and a transmission distance. It is the schematic which shows the structure of the power transmission apparatus and power receiving apparatus by 2nd Embodiment, and the structure of the power transmission apparatus by 3rd Embodiment. It is the schematic which shows the structure of the power transmission apparatus by 4th Embodiment, and the structure of the power transmission apparatus by 5th Embodiment. It is the schematic which shows the structure of the power transmission apparatus by 6th Embodiment. It is the schematic which shows the structure of the power transmission apparatus by 7th Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(1) Power transmission efficiency and impedance ratio In FIG. 1, reference numeral 1 denotes a conventional power transmission system (hereinafter referred to as a conventional system) used for explaining the outline of the present invention. The power can be transmitted from the power transmission device 2 to the power reception device 3 in a contactless manner. Here, in the power transmission method using the resonance phenomenon due to the magnetic field, an alternating current flows through the power transmission resonator 4 on the power supply side, and thus a vibration of the magnetic field is generated. Thus, an alternating current flows through the power receiving resonator 5, and the power transmission distance can be made longer than that of the power transmission method using electromagnetic induction. Here, first, the transmission efficiency of power from the power transmission device 2 to the power reception device 3 using the conventional system 1 will be described below.

  In this case, the conventional system 1 has a configuration in which, for example, a load 7 such as a lamp is connected to the power receiving resonator 5 while the AC power source 6 is connected to the power transmitting resonator 4. The power receiving resonator 5 can resonate at a predetermined resonance frequency. Such a conventional system 1 can be replaced with an equivalent circuit as shown in FIG.

In practice, the power transmission resonator 4 has a configuration in which a resistor 8 having a resistance value R _S , a capacitor 9 having a capacitance C _S , and a power transmission loop coil 10 having a self inductance L _S are connected in series. The power transmission resonator 4 is connected in series with an AC power supply 6 having an AC voltage value Vsrc, and an AC current having an AC current value Isrc flows therethrough. On the other hand, the power-receiving resonator 5 includes a resistor 11 of resistance R _D, a capacitor 12 of capacitance C _D, the configuration in which a power receiving loop coil 13 of the self-inductance L _D are connected in series. The power receiving resonator 5 is connected in series with a load 7 having a resistance value R _id (where Z _O represents the characteristic impedance of the transmission line, and the resistance value R _id of the load 7 matches Z _O ). Yes.

Here, the mutual inductance of the power transmission loop coil 10 and the receiving loop coil 13 and M _SD, the impedance of the power transmission device 2 and Z _S, the impedance of the power receiving device 3 and Z _D, receiving resonator 5 by the resonance phenomenon of a magnetic field _{Assume that} an alternating current having an alternating current value I _id flows through. In this case, in the conventional system 1, the following relationship is established from Kirchhoff's second law (j is an imaginary unit, and ω is the output frequency of the AC voltage output from the AC power supply).

Here, in the 10MHz approximately above high frequency, as shown in FIG. 3, it is divided into an input wave W _i and the reflected wave W _r and the transmitted wave W _t consider the power transmission efficiency. In this case, the voltage amplitude V _i of the incident wave W _i incident on the power transmission resonator 4 from the AC power supply 6 is (Vsrc + Z _O Isrc) / 2, and the input power P _{i at} this time is V _i ² / Z. _O. Further, the voltage amplitude _{V r} of the reflected wave _{W r} of the input wave _{W i} is returned to the AC power source 6 side is reflected by the power transmitting resonator _{4, (Vsrc - Z O Isrc)} / 2 , and the reflected power at this time _Pr becomes V _r ² / Z ² _O. Further, the voltage amplitude V _t of the transmitted wave W _t that has passed through the power receiving resonator 5 is Z _O Isrc, and the transmitted power P _{t at} this time is V _t ² / Z _O.

  As a result, the transmission efficiency η of power from the AC power supply 6 to the load 7 can be expressed as the following formula 2.

  Further, the conventional system 1 can express the coupling coefficient k as the following Equation 3.

Further, when the Q value of the power transmission resonator 4 is Q _s and the Q value of the power reception resonator 5 is Q _D , Q _s and Q _D can be expressed as the following Expression 4 (ω _o is the power transmission) The natural frequencies of the resonator 4 and the power receiving resonator 5 are shown).

Also, assuming that the impedance ratio of the power transmission resonator 4 is r _S and the impedance ratio of the power reception resonator 5 is r _D , r _S and r _D can be expressed as the following Expression 5, respectively.

Regarding the power transmission efficiency η, using these coupling coefficients k, Q _s and Q _D that are Q values, and r _S and r _D that are impedance ratios, real physical attributes are summarized as dimensionless parameters. The following equation 6 can be expressed.

When the output frequency of the AC power supply 6 is ω = ω1 or ω = ω2, the reflected power P _r = 0, and when the impedance ratios r _S and r _D satisfy the relationship of the following Expression 7, η is maximized.

Here, the relationship among the frequency ratio ω / ω _o , the impedance ratios r _S and r _D, and the transmission efficiency η is as shown in FIG. 4 (here, the coupling coefficient k = 0.03, the Q value Q _s = Q _D = 333). The peak η _peak with a high transmission efficiency η varies depending on the transmission distance between the power transmission resonator 4 and the power reception resonator 5, the coupling coefficient k, and the like. For example, as shown in FIG. 5, a transmission loop coil 10 and a power reception loop coil 13 having a regular quadrilateral shape and a length of each side of 1 are used, and the transmission distance between the power transmission loop coil 10 and the power reception loop coil 13 is set as follows. In the case of z, as shown in FIGS. 6A, 6B, and 6C, the peak η _peak of the transmission efficiency η moves due to changes in the relative distance z / l and the coupling coefficient k (FIG. 6 ( (A), (B), and (C), the peak η _peak of the transmission efficiency η is indicated by an asterisk).

  In particular, as the transmission distance z decreases, the valley of the transmission efficiency η caused by the resonance frequency split increases and the transmission efficiency η decreases greatly. Therefore, in order to maintain a high transmission efficiency η when the transmission distance z changes, it is necessary to match the impedance ratio.

Here, in FIG. 7, reference numeral 21 denotes a power transmission system of the present invention. The power transmission system 21 includes a power transmission device 24 in which a power transmission pickup coil 23 is movably provided in a power transmission resonance coil 22, and a power reception resonance coil 25. Even if the transmission distance between the power transmission device 24 and the power reception device 27 is changed, the power transmission pickup coil 23 and / or the power reception pickup coil 26 are provided accordingly. Is adjusted so that the impedance ratio coincides with (1 + k ² Q _S Q _D ) ^{1/2 of Equation} 7 described above, and high transmission efficiency can be maintained. . Hereinafter, the power transmission system 21 of the present invention will be described in detail.

(2) Outline of the Present Invention In practice, the power transmission system 21 according to the first embodiment of the present invention can transmit power from the power transmission device 24 to the power reception device 27 by using a magnetic field resonance phenomenon in a specific contact. It is made like that. In the case of this embodiment, the power transmission device 24 includes a capacitor 30, a power transmission resonance coil 22 that is magnetically coupled to the power reception resonance coil 25 by magnetic field resonance, and a power transmission pickup coil 23 that includes the capacitor 31 are transparent. It is provided on a support portion 32 made of a transparent acrylic plate.

  In the power transmission device 24, the outer contour of the power transmission pickup coil 23 is selected to be smaller than the outer contour of the power transmission resonance coil 22, and the power transmission pickup coil 23 is disposed in an area surrounded by the power transmission resonance coil 22. Is configured to be able to adjust the distance between the gravity center position of the power transmission resonance coil 22 and the gravity center position of the power transmission pickup coil 23 by sliding and moving in a predetermined direction.

  In the case of this embodiment, the power transmission resonance coil 22 has a predetermined natural frequency. For example, in a state where a conductive wire such as a copper wire is bent into four sides and formed into a coil shape, the holding unit 33 It is fixed to the surface of the support part 32 by.

  In addition to such a configuration, the support portion 32 is provided with a slide portion 34 made of, for example, a transparent acrylic plate on the outer inner surface of the power transmission resonance coil 22 so as to be slidable in the vertical direction. The slide portion 34 has a power transmission pickup coil 23 fixed to the surface and a fixed portion (not shown) that can slide along the guide portion 35 provided on the support portion 32 and can be fixed at a predetermined position. Z). Thereby, the slide part 34 slides in the vertical direction along the guide part 35 provided in the support part 32, so that the gravity center position of the power transmission pickup coil 23 moves in the vertical direction, and the gravity center of the power transmission resonance coil 22 and The distance is adjusted so that it can be adjusted.

  That is, as shown in FIG. 8, the power transmission pickup coil 23 slides in the vertical direction of the slide portion 34, and the winding region S1 surrounded by the power transmission resonance coil 22 and the winding surrounded by the power transmission pickup coil are as shown in FIG. The position of the center of gravity O2 of the power transmission pickup coil 23 can move in the vertical direction along the vertical line P that overlaps the center of gravity O1 of the power transmission resonance coil 22 while keeping the region S2 parallel.

  Thus, in the power transmission pickup coil 23, when the slide portion 34 slides upward, the position of the center of gravity O2 of the power transmission pickup coil 23 moves to the height of the center of gravity O1 of the power transmission resonance coil 22, and the center of gravity O2 is It overlaps with the center of gravity O1 of the power transmission resonance coil on the horizontal line. On the other hand, the power transmission pickup coil 23 can move so that the position of the center of gravity O2 of the power transmission pickup coil 23 moves away from the center of gravity O1 of the power transmission resonance coil 22 by sliding the slide portion 34 downward.

  Here, the power transmission pickup coil 23 is fixed to the surface of the slide portion 34 by the holding portion 37 in a state where a conductive wire such as a copper wire is bent into a quadrilateral shape and formed into a coil shape. The power transmission pickup coil 23 has a predetermined natural frequency that is the same as the natural frequency of the power transmission resonance coil 22, and the natural frequency of the power transmission resonance coil 22 and the natural frequency of the power transmission pickup coil 23 are different. It is possible to prevent the occurrence of a shift in the resonance frequency of the entire power transmission device 24 caused by the above.

  In such a power transmission device 24, the AC power supply 6 whose output frequency is set to the resonance frequency is connected to the power transmission pickup coil 23 via the wiring 38, and the AC current is transmitted from the AC power supply 6 to the power transmission pickup coil 23. The alternating current is generated in the power transmission resonance coil 22 by electromagnetic induction or magnetic field resonance by the power transmission pickup coil 23.

  In addition to this configuration, the power transmission device 24 adjusts the position of the center of gravity O2 of the power transmission pickup coil 23 to change the magnetic flux penetrating through the outer periphery of the power transmission pickup coil 23 among the magnetic flux generated by the power transmission resonance coil 22. It is made to be able to do. As a result, the power transmission device 24 increases or decreases the step-up ratio of the power transmission resonance coil 22 with respect to the power transmission pickup coil 23, and the step-up ratio between the power transmission pickup coil 23 and the power transmission resonance coil 22 increases or decreases. The ratio can be adjusted.

  That is, in this power transmission device 24, since the magnetic flux density is higher from the center of gravity O1 of the power transmission resonance coil 22 toward the outer edge side, the power transmission pickup coil 23 is moved to the center of gravity O1 side of the power transmission resonance coil 22, thereby The magnetic flux penetrating the outer portion of the coil 23 is reduced, and the impedance ratio of the power transmission resonance coil 22 can be lowered. On the other hand, the power transmission device 24 moves the power transmission pickup coil 23 to the outer edge side of the power transmission resonance coil 22, thereby increasing the magnetic flux penetrating the outer periphery of the power transmission pickup coil 23 and increasing the impedance ratio of the power transmission resonance coil 22. Can do.

  On the other hand, as shown in FIG. 7, a power receiving device 27 to which power is transmitted from the power transmitting device 24 in a non-contact manner has the same configuration as the power transmitting device 24, includes a capacitor 40, and transmits a power transmission resonance coil by magnetic field resonance. A power receiving resonance coil 25 that is magnetically coupled to 22 and a power receiving pickup coil 26 including a capacitor 41 are provided on a support portion 42 made of a transparent acrylic plate.

  In the power receiving device 27, the outline of the power receiving pickup coil 26 is selected to be smaller than the outline of the power receiving resonant coil 25, and the power receiving pickup coil 26 is disposed in a region surrounded by the power receiving resonant coil 25. Is configured to be able to adjust the distance between the gravity center position of the power reception resonance coil 25 and the gravity center position of the power reception pickup coil by sliding in a predetermined direction.

  In the case of this embodiment, the power reception resonance coil 25 has the same predetermined natural frequency as the power transmission resonance coil 22 and the power transmission pickup coil 23. For example, a conductive wire material such as a copper wire is bent into a quadrilateral shape. In a state of being formed in a shape, it is fixed to the surface of the support portion 42 by the holding portion 43.

  In addition to such a configuration, the support portion 42 is provided with a slide portion 44 made of, for example, a transparent acrylic plate on the outer inner surface of the power receiving resonance coil 25 so as to be slidable in the vertical direction. The slide portion 44 includes a fixed portion (not shown) that can be fixed at a predetermined position by sliding along the guide portion 45 provided on the support portion 42 while the power receiving pickup coil 26 is fixed to the surface. Z). Thereby, the slide part 44 slides in the vertical direction along the guide part 45 provided in the support part 42, like the power transmission device 24, so that the gravity center position of the power receiving pickup coil 26 moves in the vertical direction. The distance from the center of gravity of the power receiving resonance coil 25 can be adjusted.

  That is, the power pickup coil 26 is also slid along the vertical line P that overlaps the gravity center O1 of the power reception resonance coil 25 as shown in FIG. Can move up and down. In this way, the power receiving pickup coil 26 moves the position of the center of gravity O2 of the power receiving pickup coil 26 to the height of the center of gravity O1 of the power receiving resonance coil 25 by sliding the slide portion 44 upward, and the center of gravity O2 It overlaps with the center of gravity O1 of the power receiving resonance coil 25 on the horizontal line. On the other hand, the power receiving pickup coil 26 can move so that the position of the center of gravity O2 of the power receiving pickup coil 26 is separated below the center of gravity O1 of the power receiving resonance coil 25 by sliding the slide portion 44 downward.

  Here, the power receiving pickup coil 26 is fixed to the surface of the slide portion 44 by the holding portion 47 in a state where a conductive wire such as a copper wire is bent into four sides and formed into a coil shape. The power receiving pickup coil 26 has a predetermined natural frequency that is the same as the natural frequency of the power receiving resonance coil 25, and the natural frequency of the power receiving resonance coil 25 and the natural frequency of the power receiving pickup coil 26 are different. It is possible to prevent the occurrence of a shift in the resonance frequency of the entire power receiving device 27 caused by the above.

  Thus, since the power reception device 27 is selected so that the natural frequency of the power reception resonance coil 25 matches the natural frequency of the power transmission resonance coil 22, the power reception device 27 generates a magnetic field that vibrates at the resonance frequency generated by the power transmission resonance coil 22. The power receiving resonance coil 25 resonates, and an alternating current can be generated in the power receiving resonance coil 25. Thus, the power receiving device 27 can generate an alternating current in the power receiving pickup coil 26 by electromagnetic induction by the power receiving resonance coil 25 or magnetic field resonance. Thus, the power receiving device 27 can supply current to the load 7 through the wiring 48 connected to the power receiving pickup coil 26.

  In addition to this configuration, in the power receiving device 27, by adjusting the position of the center of gravity O2 of the power receiving pickup coil 26, among the magnetic flux generated by the power receiving resonance coil 25, the magnetic flux penetrating through the inside of the power receiving pickup coil 26 changes. It is made to be able to do. As a result, in the power receiving device 27, the power receiving pickup coil 26 is stepped up or down with respect to the power receiving resonant coil 25 side, and the step-up ratio between the power receiving pickup coil 26 and the power receiving resonant coil 25 is increased or decreased, and the impedance of the power receiving resonant coil 25 is increased. The ratio can be adjusted.

  In practice, in the power receiving device 27, as in the power transmitting device 24, the magnetic flux density is higher from the center of gravity O1 toward the outer edge side in the power receiving resonance coil 25. Therefore, the power receiving pickup coil 26 is moved to the center of gravity O1 side of the power receiving resonance coil 25. By moving it, the magnetic flux penetrating the outline of the power receiving pickup coil 26 is reduced, and the impedance ratio of the power receiving resonance coil 25 can be lowered. On the other hand, the power receiving device 27 moves the power receiving pickup coil 26 to the outer edge side of the power receiving resonant coil 25, thereby increasing the magnetic flux penetrating the outer periphery of the power receiving pickup coil 26 and increasing the impedance ratio of the power receiving resonant coil 25. Can do.

(3) Relationship between position change of power transmission pickup coil and power reception pickup coil and power transmission efficiency in power transmission system of present invention Next, power transmission system 21 as shown in FIG. The relationship between the change in position of the pickup coil 26 and the power transmission efficiency from the power transmission device 24 to the power reception device 25 at this time was verified. Actually, in the power transmission device 24, for example, a regular quadrilateral power transmission resonance coil 22 having a side l of about 198 mm, and a regular quadrilateral power transmission pickup having a side L of about 96 mm, which is about half of the side l of the power transmission resonance coil 22. Using the coil 23, the power transmission pickup coil 23 was disposed at a position about 2 mm away from the power transmission resonance coil 22 so as to face the power transmission resonance coil 22 in parallel.

  The power transmission pickup coil 23 is provided so that the position of the center of gravity O2 can move in the vertical direction along a vertical line overlapping the center of gravity O1 of the power transmission resonance coil 22. In this case, the power transmission pickup coil 23 uses the height of the center of gravity O1 of the power transmission resonance coil 22 as the reference height Ho, and the position of the center of gravity O2 of the power transmission pickup coil 23 from the reference height Ho vertically downward to a maximum of about 48 mm. It was set so that it could move. Accordingly, the power transmission pickup coil 23 is arranged so that the center of gravity O2 coincides with the center of gravity O1 of the power transmission resonance coil 22 on the horizontal line when the center of gravity O2 is the reference height Ho, for example.

  The power receiving device 25 has the same configuration as that of the power transmitting device 24, for example, a regular quadrilateral power receiving resonance coil 25 having a side l of about 198 mm, and a side L of about 96 mm, which is about half of one side l of the power receiving resonance coil 25. The power receiving pickup coil 26 is arranged at a position about 2 mm away from the power receiving resonance coil 25 so as to face the power receiving resonance coil 25 in parallel.

  The power receiving pickup coil 26 is provided so that the center of gravity O2 can move in the vertical direction along a vertical line overlapping the center of gravity O1 of the power receiving resonance coil 25. In this case, the power receiving pickup coil 26 has the height of the center of gravity O1 of the power receiving resonance coil 25 as the reference height Ho, and the center of gravity O2 of the power receiving pickup coil 26 moves vertically downward from the reference height Ho to a maximum of about 48 mm. Set to get. Thereby, the power receiving pickup coil 26 is arranged so that the center of gravity O2 coincides with the center of gravity O1 of the power receiving resonance coil 25 on the horizontal line when the center of gravity O2 is the reference height Ho, for example.

  The power transmission resonance coil 22 and the power reception resonance coil 25 can adjust the transmission distance z between the power transmission resonance coil 22 and the power reception resonance coil 25 between 200 and 400 mm, which is about 1 to 2 times the side l. I made it. The power transmission resonance coil 22, the power transmission pickup coil 23, the power reception resonance coil 25, and the power reception pickup coil 26 are provided with mica capacitors as capacitors 30, 31, 40, and 41, respectively.

  As shown in FIG. 10, in the power transmission system 21, the power transmission pickup coil 23 is electrically connected to the TG (tracking generator) output of the tracking generator / spectrum analyzer 50 and the tracking generator / spectra analyzer 50. The power receiving pickup coil 26 is electrically connected to the SA (spare) input, and an average resonance frequency of 13.44 MHz of the power transmission resonance coil 22, the power transmission pickup coil 23, the power reception resonance coil 25, and the power reception pickup coil 26 is set as a power frequency. did.

First, the transmission distance z between the power transmission resonance coil 22 and the power reception resonance coil 25 is increased at a predetermined interval from 200 mm to 400 mm, and at each transmission distance z, the impedance ratio is (1 + k ² Q _{S of} Equation 7 described above). Q _D ) The positions of the power transmission pickup coil 23 and the power reception pickup coil 26 (hereinafter, the positions of the power transmission pickup coil 23 and the power reception pickup coil 26 from the reference height Ho are simply referred to as the pickup coil position y so as to coincide with Q _D ) ^1/2. (Hereinafter referred to as impedance matching) and the highest transmission efficiency (transmission efficiency at the time of impedance matching) was examined. The result shown in FIG. 11 was obtained. The power transmission pickup coil 23 and the power reception pickup coil 26 were set at the same pickup coil position y.

  In FIG. 11, the change in the transmission distance z between the power transmission resonance coil 22 and the power reception resonance coil 25 is represented by a relative distance z / l. Further, as a comparative example, the transmission distance z between the power transmission resonance coil 22 and the power reception resonance coil 25 is increased from 200 mm to 400 mm at a predetermined interval with the power transmission pickup coil 23 and the power reception pickup coil 26 fixed at the pickup position y = 0. Then, the transmission efficiency (transmission efficiency at the time of impedance mismatching) at each transmission distance z was also examined. Further, the coupling coefficient k with respect to the relative distance z / l was also examined. As a result, a result as shown in FIG. 11 was obtained.

  Furthermore, when theoretical values were calculated for the transmission efficiency at the time of impedance matching and the transmission efficiency at the time of impedance mismatching, results as shown in FIG. 11 were obtained. As shown in FIG. 11, it was confirmed that a high transmission efficiency η can always be obtained by adjusting the pickup coil positions y of the power transmission pickup coil 23 and the power reception pickup coil 26 and performing impedance matching.

  Next, the transmission distance z between the power transmission resonance coil 22 and the power reception resonance coil 25 was changed, and the relationship between the impedance ratio at the time of impedance matching and the pickup coil position y at each transmission distance z was examined. The results as shown in Fig. 1 were obtained.

  From the results shown in FIG. 12, it was confirmed that the measured value of the impedance ratio at the pickup coil position y when the high transmission efficiency η was obtained and the theoretical value of the impedance ratio matched. Further, it was confirmed that the pickup coil positions y of the power transmission pickup coil 23 and the power reception pickup coil 26 move toward the center of gravity O1 of the power transmission resonance coil 22 and the power reception resonance coil 25 as the transmission distance z increases.

  Next, it was also verified how the transmission efficiency η changes when only one of the power transmission pickup coil 23 and the power reception pickup coil 26 is moved. As a result, a result as shown in FIG. 13 was obtained. In this case, on the condition that the transmission efficiency η is 60% or more, the transmission distance z = 300 mm between the power transmission resonance coil 22 and the power reception resonance coil 25 at which the transmission efficiency η is 60% was set as a design point.

  Here, in FIG. 13, the result when both the power transmission pickup coil 23 and the power reception pickup coil 26 are adjusted to the same pickup coil position y is shown as “both sides control”. In FIG. 13, either the power transmission pickup coil 23 or the power reception pickup coil 26 is fixed at the pickup coil position y = 0, and only the pickup coil position y of the other power reception pickup coil 26 or the power transmission pickup coil 23 is adjusted. The result was shown as “one-sided control”. Furthermore, in FIG. 13, the result when both the power transmission pickup coil 23 and the power reception pickup coil 26 are fixed at the pickup coil position y = 0 is shown as “no control”.

  As shown in FIG. 13, the range of the transmission distance z in which the transmission efficiency η is 60% or more of the transmission distance z (hereinafter referred to as the effective transmission range) is compared with the effective transmission range at the time of no control. It was confirmed that the time and the time of both-side control became much wider.

(4) Operation and Effect In the above configuration, in the power transmission system 21, the power transmission device 24 including the power transmission resonance coil 22 having a predetermined natural frequency, and the natural frequency that matches the natural frequency of the power transmission resonance coil 22 The power receiving device 27 including the power receiving resonance coil 25 is disposed with a predetermined transmission distance z, the power receiving resonance coil 25 is resonated by the magnetic field generated in the power transmission resonance coil 22, and the power receiving resonance coil 22 receives the power receiving resonance coil. Transmit power to 25 with specific contact.

  In addition to this, in the power transmission device 24, a power transmission pickup coil 23 that causes the power transmission resonance coil 22 to receive power by electromagnetic induction or magnetic field resonance is disposed so as to face the power transmission resonance coil 22, and the power transmission resonance coil 22 The center of gravity O1 of the power transmission resonance coil 22 and the power transmission pickup coil are obtained by moving the power transmission pickup coil 23 in the vertical direction while keeping the winding region S1 and the winding region S2 of the power transmission pickup coil in parallel. Change the distance from the center of gravity O2 of 23.

  Thereby, the power transmission device 24 adjusts the position of the center of gravity O2 of the power transmission pickup coil 23 to change the magnetic flux penetrating through the outer periphery of the power transmission pickup coil 23 among the magnetic flux generated by the power transmission resonance coil 22, The boost ratio of the power transmission pickup coil 23 and the power transmission resonance coil 22 is increased or decreased, and the impedance ratio of the power transmission device 24 can be adjusted. Thus, in the power transmission device 24, high transmission can be achieved by adjusting the impedance of the power transmission pickup coil 23 viewed from the power transmission resonance coil 22 by changing the state of magnetic flux (linkage state) penetrating through the outline of the power transmission pickup coil 23. The efficiency η can be maintained.

  Further, in the power receiving device 27, a power receiving pickup coil 26 that receives power from the power receiving resonant coil 25 by electromagnetic induction or magnetic field resonance by the power receiving resonant coil 25 is disposed so as to face the power receiving resonant coil 25, and the power receiving resonance With the winding area S1 of the coil 25 and the winding area S2 of the power receiving pickup coil 26 in parallel, the power receiving pickup coil 26 moves in the vertical direction, so that the center of gravity O1 of the power receiving resonance coil 25 is obtained. And the center of gravity O2 of the power receiving pickup coil 26 are changed.

  Thereby, in the power receiving device 27, by adjusting the position of the center of gravity O2 of the power receiving pickup coil 26, among the magnetic flux generated by the power receiving resonance coil 25, the magnetic flux penetrating through the inside of the power receiving pickup coil 26 is changed, The step-up ratio between the power receiving pickup coil 26 and the power receiving resonance coil 25 is increased or decreased, and the impedance ratio of the power receiving device 27 can be adjusted. Thus, in the power receiving device 27, by changing the state of magnetic flux (linkage state) penetrating the inside of the power receiving pickup coil 26 and adjusting the impedance of the power receiving pickup coil 26 viewed from the power receiving resonance coil 25, high transmission is achieved. The efficiency η can be maintained.

  In the power transmission system 21, the impedance ratio is adjusted by changing the pickup coil position y of the power transmission pickup coil 23 in the power transmission device 24, and the impedance is also changed in the power reception device 27 by changing the pickup coil position y of the power reception pickup coil 26. As compared with the case where the ratio is adjusted and only the pickup coil position y of either the power transmission pickup coil 23 or the power reception pickup coil 26 is changed, the adjustment amount of the impedance ratio can be increased, and the transmission efficiency η is further increased. Electric power can be transmitted.

  In the power transmission device 24, the winding region S1 of the power transmission resonance coil 22 and the winding region S1 of the power transmission pickup coil 23 are disposed so as to face each other, and a predetermined interval is provided with respect to the power transmission resonance coil 22. Since the power transmission pickup coil 23 is disposed, the power transmission pickup coil 23 can be moved beyond the winding region S1 of the power transmission resonance coil 22 to the outside of the outer shell, and thus the power transmission pickup coil 23 is moved. The degree of freedom is increased and the adjustment amount of the impedance ratio can be further increased.

  Incidentally, the power receiving device 27 has the same configuration as that of the power transmitting device 24, and the winding region S1 of the power receiving resonance coil 25 and the winding region S1 of the power receiving pickup coil 26 are arranged to face each other. In addition, since the power receiving pickup coil 26 is disposed at a predetermined interval with respect to the power receiving resonance coil 25, the power receiving device 27 also has a greater degree of freedom to move the power receiving pickup coil 26, and the impedance ratio adjustment amount is further increased. Can be made.

(5) Other Embodiments The present invention is not limited to the present embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the embodiment described above, the power transmission resonance coil 22, the power transmission pickup coil 23, the power reception resonance coil 25, and the power reception pickup coil 26 are provided with capacitors 30, 31, 40, and 41, respectively. The case where the coil 23, the power receiving resonance coil 25, and the power receiving pickup coil 26 are each thinned to reduce the thickness has been described. However, the present invention is not limited to this, and the power transmission resonance coil 22, the power transmission pickup coil 23, the power receiving resonance coil 25 is provided. And without providing the capacitors 30, 31, 40, 41 to the power receiving pickup coil 26, the winding amounts of the power transmission resonance coil 22, power transmission pickup coil 23, power reception resonance coil 25, and power reception pickup coil 26 are simply increased. Also good.

  In the above-described embodiment, the power transmission resonance coil 22, the power transmission pickup coil 23, the power reception resonance coil 25, and the power reception pickup coil 26 have been described as having a quadrilateral shape. Even in various shapes such as a circle, an ellipse, and a polygon, the same effect as described above can be obtained.

  Furthermore, in the first embodiment described above, as shown in FIG. 8, the power transmission device 24 in which the power transmission pickup coil 23 moves in the vertical direction with a predetermined interval from the power transmission resonance coil 22 is provided. As described above, the present invention is not limited to this, and the point is that the magnetic flux penetrating through the outline of the power transmission pickup coil 23 may be changed, and the power transmission pickup coil 23 approaches or moves away from the power transmission resonance coil 22. The power transmission pickup coil 23 may move in various other directions such as movement. Similarly, in the power receiving device, it is only necessary to change the magnetic flux penetrating through the outline of the power receiving pickup coil 26, and the power receiving pickup coil 26 may be moved in various directions. The power transmission pickup coil 23 and the power reception pickup coil 26 of the power reception device 27 do not necessarily have to move in the same direction.

  Furthermore, in the above-described embodiment, the power transmission resonance coil 22 and the power reception resonance coil 25 are fixed, and the power transmission pickup coil 23 and the power reception pickup coil 26 are moved. However, the present invention is not limited thereto. First, the power transmission pickup coil 23 and the power reception pickup coil 26 are fixed and the power transmission resonance coil 22 and the power reception resonance coil 25 are moved, or when the power transmission resonance coil 22 and the power reception resonance coil 25 are moved, the power transmission pickup The coil 23 and the power receiving pickup coil 26 may also be moved.

(5-1) Second Embodiment In FIG. 14 (A) in which the same reference numerals are assigned to the parts corresponding to those in FIG. 8, 61 denotes a power transmission device according to the second embodiment. Has a configuration in which a power transmission pickup coil 23 is provided in the winding region S1 of the power transmission resonance coil 22, and the power transmission resonance coil 22 and the power transmission pickup coil 23 are arranged on the same plane.

  In this case, the power transmission device 61 arranges the winding region S2 of the power transmission pickup coil 23 in the winding region S1 of the power transmission resonance coil 22, and arranges the power transmission pickup coil 23 on the same plane with respect to the power transmission resonance coil 22. It is configured to be able to move up and down while remaining in the state. In this case, the movement range of the power transmission resonance coil 22 in the direction in which the power transmission pickup coil 23 moves away from the center of gravity O1 is until the power transmission pickup coil 23 comes into contact with the outline of the power transmission resonance coil 22.

  In the above configuration, the power transmission device 61 can achieve the same effect as described above, and can reduce the thickness of the power transmission device 61 by the amount that the power transmission resonance coil 22 and the power transmission pickup coil 23 are arranged on the same plane. it can. Although only the power transmission device 61 has been described as the second embodiment, the power receiving device 62 may have the same configuration as the power transmission device 61 described above.

(5-2) Third Embodiment Furthermore, in the above-described embodiment, for example, the case where the power transmission resonance coil 23 whose outer shape is a regular quadrilateral shape is described, but the present invention is not limited to this. As shown in FIG. 14B in which the same reference numerals are assigned to the parts corresponding to those in FIG. 14A, a power transmission resonance coil 64 whose outer shape is a vertically long rectangular shape may be applied.

  According to the above configuration, in the power transmission device 65, even if the power transmission resonance coil 64 and the power transmission pickup coil 23 are arranged on the same plane, the movement range of the power transmission pickup coil 23 is increased. The distance between the center of gravity O1 and the center of gravity O2 of the power transmission pickup coil 23 can be greatly changed. Although only the power transmission device 65 has been described as the third embodiment, the power receiving device may have the same configuration as that of the power transmission device 65 described above.

(5-3) Fourth Embodiment In FIG. 15A, in which parts corresponding to those in FIG. 8 are assigned the same reference numerals, reference numeral 71 denotes a power transmission device according to the fourth embodiment. Has a configuration in which the winding area S2 of the power transmission pickup coil 23 is inclined at a predetermined angle with respect to the winding area S1 of the power transmission resonance coil 22.

  In this case, the power transmission pickup coil 23 moves in the vertical direction along the vertical line P of the power transmission resonance coil 22 while being inclined at a predetermined angle, and the center of gravity O2 of the power transmission pickup coil 23 and the power transmission resonance coil 23 The distance from the center of gravity O1 can be adjusted.

  In practice, the power transmission pickup coil 23 is arranged so that one side of the quadrilateral is close to the power transmission resonance coil, and the other side opposite to the one side is arranged with a predetermined distance from the power transmission resonance coil. As a result, the winding region S2 of the power transmission pickup coil 23 can be arranged to be inclined at a predetermined angle θ with respect to the center line X1 parallel to the vertical line P.

  Such a power transmission pickup coil 23 moves in the vertical direction along the vertical line P via a slide portion (not shown), so that the center of gravity O2 moves in the vertical direction while being tilted at a predetermined angle θ, and power transmission resonance The distance between the center of gravity O1 of the coil 22 and the center of gravity O2 of the power transmission pickup coil 23 can be changed.

  Also in the above configuration, the power transmission device 71 can obtain the same effects as those of the first embodiment described above. Although only the power transmission device 71 has been described as the fourth embodiment, the power reception device may have the same configuration as the above-described power transmission device.

(5-4) Fifth Embodiment In FIG. 15 (B), in which parts corresponding to those in FIG. 15 (A) are assigned the same reference numerals, 81 denotes a power transmission device according to the fifth embodiment. The power transmission device 81 is provided with a rotation axis X2 on one side of a quadrilateral extending in a direction perpendicular to the center line X1 in the power transmission pickup coil 23, and the power transmission pickup coil 23 rotates about the rotation axis X2. Has been made to get.

  When the power transmission pickup coil 23 rotates about the rotation axis X2, the winding region S2 of the power transmission pickup coil 23 is displaced by a predetermined angle θ with respect to the winding region S1 of the power transmission resonance coil 22, and power transmission resonance The distance between the center of gravity O1 of the coil 22 and the center of gravity O2 of the power transmission pickup coil 23 can be changed.

  Thereby, the power transmission pickup coil 23 is adjusted and positioned at the predetermined angle θ, whereby the state of linkage of the magnetic flux in the power transmission pickup coil 23 is changed, and the impedance ratio can be adjusted. Also in the above configuration, the same effect as that of the first embodiment described above can be obtained. Although only the power transmission device 81 has been described as the fifth embodiment, the power reception device may have the same configuration as the above-described power transmission device.

(5-5) Sixth Embodiment In FIG. 16, in which parts corresponding to those in FIG. 15B are assigned the same reference numerals, 91 denotes a power transmission device according to the sixth embodiment. Is provided with a rotation axis X3 extending in a direction perpendicular to the center line X1 and passing through the center of gravity O2 of the power transmission pickup coil, and the power transmission pickup coil 23 rotates about the rotation axis X3. It is made to be able to do.

  By rotating the power transmission pickup coil 23 about the rotation axis X3, the winding region S2 of the power transmission pickup coil 23 can be displaced by a predetermined angle θ with respect to the winding region S1 of the power transmission resonance coil 22. In this case, although the distance between the center of gravity O1 of the power transmission resonance coil 22 and the center of gravity O2 of the power transmission pickup coil 23 does not change, the power transmission pickup coil 23 rotates about the rotation axis X3, thereby transmitting the power transmission pickup coil 23. The interlinkage state of the magnetic flux in can be changed, and the impedance ratio can be adjusted. Also in the above configuration, the same effect as that of the first embodiment described above can be obtained. Although only the power transmission device 91 has been described as the sixth embodiment, the power receiving device may have the same configuration as the above-described power transmission device.

(5-6) Seventh Embodiment In FIG. 17 in which the same reference numerals are assigned to the parts corresponding to FIG. 14A, reference numeral 92 denotes a power transmission device according to the seventh embodiment. The insertion member 93 having dielectricity and / or permeability can be disposed so as to penetrate the winding region S1 of the power transmission resonance coil 22 and the winding region S2 of the power transmission pickup coil 23.

  The insertion member 93 is made of, for example, an iron core formed in a cylindrical shape, and moves along the vertical line P, thereby allowing the winding region S1 of the power transmission resonance coil 22 and the winding region S2 of the power transmission pickup coil 23 to move. The insertion position can be changed. Further, the insertion member 93 is configured to move along an insertion line Px that is orthogonal to the vertical line P and parallel to the direction approaching and moving away from the power transmission resonance coil 22 and the power transmission pickup coil 23. .

  Thereby, the insertion member 93 changes along the vertical line P and / or the insertion line Px, thereby changing the insertion state of the power transmission resonance coil 22 in the winding region S1 and the power transmission pickup coil 23 in the winding region S2. Can be. Thus, the power transmission pickup coil 23 can adjust the impedance ratio by changing the linkage state of the magnetic flux in the power transmission pickup coil 23 in accordance with the insertion / removal state of the insertion member 93. Also in the above configuration, the same effect as that of the first embodiment described above can be obtained. Although only the power transmission device 92 has been described as the seventh embodiment, the power reception device may have the same configuration as the above-described power transmission device.

  Further, the first to seventh embodiments described above can be appropriately combined. For example, the power transmission device 24 according to the first embodiment or the power transmission according to the fifth embodiment. The device 81 may be provided with the insertion member 93 according to the seventh embodiment.

21 Power transmission system
22 Transmission resonance coil
23 Transmission pickup coil
24 Power transmission equipment
25 Receiving resonance coil
26 Power receiving pickup coil
27 Power receiving device

Claims (14)

A power transmission resonance coil that is magnetically coupled to a power reception resonance coil of a power reception device by resonance of a magnetic field, and transmits power to the power reception resonance coil;
A power transmission pickup coil that causes the power transmission resonance coil to receive electric power by electromagnetic induction or magnetic field resonance;
The power transmission pickup coil is:
The power transmission device, wherein an impedance of the power transmission pickup coil viewed from the power transmission resonance coil is adjusted by changing a linkage state of magnetic flux generated in the power transmission resonance coil. By moving at least one of the power transmission resonance coil and the power transmission pickup coil in a predetermined direction and changing the distance between the center of gravity of the power transmission resonance coil and the center of gravity of the power transmission pickup coil, the power transmission pickup coil The power transmission device according to claim 1, wherein the state of linkage of the magnetic flux in is changed. The power transmission pickup coil is disposed within a winding region of the power transmission resonance coil, and the power transmission resonance coil and the power transmission pickup coil are disposed on the same plane. apparatus. The power transmission pickup coil is:
The winding region of the power transmission pickup coil is disposed so as to face the winding region of the power transmission resonance coil, and the power transmission resonance coil is disposed at a predetermined interval. The power transmission device according to claim 1 or 2. An insertion member having dielectric and / or magnetic permeability,
The power transmission device according to any one of claims 1 to 4, wherein the insertion member changes a position with respect to the power transmission resonance coil and the power transmission pickup coil. The power transmission device according to claim 1, wherein a capacitor is provided in the power transmission resonance coil and / or the power transmission pickup coil. A power receiving resonance coil that is magnetically coupled to a power transmission resonance coil of a power transmission device by resonance of a magnetic field and receives power from the power transmission resonance coil;
A power receiving pickup coil that receives power from the power receiving resonant coil by electromagnetic induction or magnetic field resonance;
The power receiving pickup coil is
The power receiving device, wherein an impedance of the power receiving pickup coil viewed from the power receiving resonant coil is adjusted by changing a linkage state of magnetic flux generated in the power receiving resonant coil. By moving at least one of the power receiving resonance coil and the power receiving pickup coil in a predetermined direction and changing the distance between the center of gravity of the power receiving resonance coil and the center of gravity of the power receiving pickup coil, the power receiving pickup coil The power receiving device according to claim 7, wherein the interlinkage state of the magnetic flux is changed. 9. The power receiving device according to claim 7, wherein the power receiving pickup coil is disposed in a winding region of the power receiving resonance coil, and the power receiving resonance coil and the power receiving pickup coil are disposed on the same plane. apparatus. The power receiving pickup coil is
The winding region of the power receiving pickup coil is disposed so as to face the winding region of the power receiving resonance coil, and the power receiving resonance coil is disposed at a predetermined interval. The power receiving device according to claim 7 or 8. An insertion member having dielectric and / or magnetic permeability,
The power receiving device according to any one of claims 7 to 10, wherein the insertion member changes a position with respect to the power receiving resonance coil and the power receiving pickup coil. The power receiving device according to claim 7, wherein a capacitor is provided in the power receiving resonance coil and / or the power receiving pickup coil. In a power transmission system in which power is transmitted from a power receiving device to a power transmitting device by magnetic field resonance
The power transmission device is the power transmission device according to any one of claims 1 to 6,
The power transmission system according to any one of claims 7 to 12, wherein the power reception device is the power transmission device according to any one of claims 7 to 12. The position of the power reception pickup coil with respect to the power reception resonance coil in the power reception device and the position of the power transmission pickup coil with respect to the power transmission resonance coil in the power transmission device are adjusted to be the same state.
The power transmission system according to claim 13.

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