JP2011120382A - Non-contact power feed equipment, non-contact power receiving device, and non-contact power feed system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a mechanism which adjusts a resonance frequency in a non-contact power feed resonance system without installing a variable capacity capacitor. <P>SOLUTION: Non-contact power feed to a secondary side from a primary side is performed by an effect that a primary self-resonance coil 30 on the primary side (power feed equipment) and a secondary self-resonance coil 70 on the secondary side (power receiving device) resonate with each other via an electromagnetic field. The adjustment mechanisms 50, 80 are provided, displacing shield plates 56, 86 being movable members constituting a part of electromagnetic shields 55, 85 for storing coil units 20, 60 with respect to the coil units 20, 60. By adjusting relative positions (distances D) of the shield plated 56, 86 with respect to the coil units 20, 60, inductances and frequencies of the primary self-resonance coil 30 and the secondary self-resonance coil 70 are adjusted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a non-contact power supply facility, a non-contact power reception device, and a non-contact power supply system, and more specifically, a non-contact power supply facility that performs non-contact power supply by resonance via an electromagnetic field between a power transmission side and a power reception side. The present invention relates to a non-contact power receiving apparatus and a non-contact power feeding system.

  Electric vehicles such as electric vehicles and hybrid vehicles are attracting attention as environmentally friendly vehicles. These vehicles are equipped with an electric motor that generates a driving force and a rechargeable power storage device that applies electric power supplied to the electric motor. The hybrid vehicle is a vehicle that further includes an internal combustion engine as a power source together with an electric motor, or a vehicle that further includes a fuel cell as well as a power storage device as a DC power source for driving the vehicle.

  In a hybrid vehicle as well as an electric vehicle, a configuration capable of charging an in-vehicle power storage device from a power source outside the vehicle is known. For example, a so-called “plug-in hybrid vehicle” is known in which a power storage device can be charged from a generally assumed power source by connecting a power outlet provided in a house and a charging port provided in a vehicle with a charging cable. Yes.

  On the other hand, as a power transmission method, wireless power transmission that does not use a power cord or a power transmission cable has recently attracted attention. As this wireless power transmission technology, three technologies known as power transmission using electromagnetic induction, power transmission using microwaves, and power transmission using a resonance method are known. Among these, the resonance method is a non-contact power transmission technique in which a pair of resonators (for example, a pair of self-resonant coils) are resonated in an electromagnetic field (near field) and power is transmitted through the electromagnetic field.

  Japanese Patent Laying-Open No. 2009-106136 (Patent Document 1) describes a configuration of an electric vehicle that can charge an in-vehicle power storage device with electric power wirelessly received from a power source outside the vehicle by a resonance method.

  Japanese Patent Laying-Open No. 2004-72832 (Patent Document 2) describes a configuration in which the resonance frequency of the power receiving circuit can be adjusted by arranging a variable capacitor in a non-contact power feeding device. As a result, even when the inductance of the power receiving circuit changes, the voltage supplied to the load is kept constant by changing the capacitance of the variable capacitor, and the voltage necessary for the load is supplied only when necessary. It is described that it becomes possible.

JP 2009-106136 A JP 2004-72832 A

  Even in non-contact power feeding to an electric vehicle as described in Patent Document 1, the resonance frequency in the resonance system may deviate from the initial design value depending on the positional relationship between the self-resonant coils. On the other hand, since the power transmission frequency in contactless power transmission by the resonance method is set to a predetermined frequency corresponding to the resonance frequency of the resonance system, when the above phenomenon occurs, the efficiency during power transmission (hereinafter simply referred to as power transmission efficiency). It is feared that this will decrease.

  If the variable capacitor described in Patent Document 2 is arranged in the resonance system, the resonance frequency can be adjusted by adjusting the capacitance so as to cancel the change in inductance. It is possible to maintain power transmission efficiency by adjusting the resonance frequency.

  However, there is a concern about the increase in size and cost of the apparatus by newly providing a variable capacitor. On the other hand, it is difficult in design to adjust the inductance only by designing the coil.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a non-contact power feeding resonance system without providing a variable capacitor and without providing a variable capacitor. It is to provide a mechanism capable of adjusting the resonance frequency.

  According to this invention, the non-contact power supply facility includes a power supply device, a power transmission resonator, an electromagnetic shield, and an adjustment mechanism. The power supply device is configured to output high-frequency power at a predetermined power transmission frequency. The power transmitting resonator is configured to transmit power from the power supply device to the power receiving device in a contactless manner by resonating with the power receiving resonator of the power receiving device via an electromagnetic field. The power transmission resonator includes a primary self-resonant coil configured to generate an electromagnetic field when fed with high-frequency power. The electromagnetic shield is configured to house the primary self-resonant coil and to provide an opening toward the power receiving resonator. The adjustment mechanism is configured to adjust the inductance of the primary self-resonant coil by displacing the movable member of the electromagnetic shield configured to be movable by an external force with respect to the primary self-resonant coil.

  Preferably, the non-contact power supply facility further includes a control device for controlling the power supply device and the power transmission resonator. The adjustment mechanism includes an actuator controlled by a control device for generating a displacement force of the movable member. The control device generates an efficiency acquisition unit for obtaining power transmission efficiency from the power transmitting resonator to the power receiving resonator, and generates an actuator control instruction for controlling the relative position of the movable member with respect to the primary self-resonant coil. An inductance adjustment control unit. The inductance adjustment control unit includes a displacement setting unit for generating a control instruction so as to change the relative position stepwise in a state where the power supply device generates high-frequency power at a predetermined power transmission frequency, and a displacement setting An optimum position search unit for searching for an optimum position corresponding to the relative position where the power transmission efficiency is maximized from the power transmission efficiency at each of the relative positions changed stepwise by the unit.

  More preferably, the control device performs an optimum position search by the displacement setting unit and the optimum position search unit at the start of power transmission processing from the non-contact power supply facility to the power receiving device, and the position of the movable member is adjusted by the adjustment mechanism. After controlling according to the optimum position, the power transmission process is executed. In particular, the output power from the power supply device when searching for the optimum position is smaller than the output power from the power supply device during power transmission processing.

  According to the present invention, the contactless power receiving device resonates with the power transmitting resonator that receives the high frequency power from the power supply device via the electromagnetic field, thereby receiving the power transmitted from the power transmitting resonator in a contactless manner. A container, an electromagnetic shield, and an adjustment mechanism. The power receiving resonator includes a secondary self-resonant coil configured to receive power from the primary self-resonant coil by resonating with the primary self-resonant coil of the power transmitting resonator via an electromagnetic field. The electromagnetic shield is configured to house the secondary self-resonant coil and to provide an opening toward the power transmitting resonator. The adjustment mechanism is configured to adjust the inductance of the secondary self-resonant coil by displacing the movable member of the electromagnetic shield configured to be movable by an external force with respect to the secondary self-resonant coil.

  Preferably, the non-contact power receiving device further includes a control device for controlling the power receiving resonator. The adjustment mechanism further includes an actuator controlled by the control device for generating a displacement force of the movable member. The control device generates an efficiency acquisition unit for obtaining power transmission efficiency from the power transmission resonator to the power reception resonator and an actuator control instruction for controlling the relative position of the movable member with respect to the secondary self-resonant coil. And an inductance adjustment control unit. The inductance adjustment control unit includes a displacement setting unit for generating a control instruction so as to change the relative position stepwise in a state where the power supply device generates high-frequency power at a predetermined power transmission frequency, and a displacement setting An optimum position search unit for searching for an optimum position corresponding to the relative position where the power transmission efficiency is maximized from the power transmission efficiency at each of the relative positions changed stepwise by the unit.

  According to this invention, the non-contact power supply system includes a power supply facility for transmitting predetermined high-frequency power and a power receiving device for receiving the power transmitted from the power supply facility in a contactless manner. The power supply facility includes a power supply device and a power transmission resonator. The power supply device is configured to output high-frequency power at a predetermined power transmission frequency. The power transmitting resonator is configured to transmit high-frequency power from the power supply device to the power receiving device in a non-contact manner by resonating via an electromagnetic field. The power transmission resonator has a primary self-resonant coil configured to generate an electromagnetic field when fed with high-frequency power. The power supply facility further includes a power transmission-side electromagnetic shield configured to store the primary self-resonant coil and to be provided with an opening toward the power receiving device. The power receiving device includes a power receiving resonator that receives power transmitted from the power transmitting resonator in a contactless manner. The power receiving resonator has a secondary self-resonant coil configured to receive power from the primary self-resonant coil by resonating with the primary self-resonant coil of the power transmitting resonator via an electromagnetic field. The power receiving device further includes a power receiving side electromagnetic shield configured to house the secondary self-resonant coil and to be provided with an opening toward the power transmitting resonator. At least one of the power supply facility and the power receiving device further includes an adjustment mechanism for adjusting the inductance of the primary self-resonant coil or the secondary self-resonant coil. The adjustment mechanism is configured to displace a movable member configured to be movable by an external force of the power transmission side electromagnetic shield or the power reception side electromagnetic shield with respect to the primary self-resonance coil or the secondary self-resonance coil. Or it is comprised so that the inductance of a secondary self-resonance coil may be adjusted.

  Preferably, the non-contact power feeding system further includes a control device for controlling the power feeding facility and the power receiving device. The adjustment mechanism further includes an actuator controlled by the control device for generating a displacement force of the movable member. The control device controls the relative position of the movable member with respect to the primary self-resonant coil or the secondary self-resonant coil in the efficiency acquisition unit for obtaining power transmission efficiency from the power transmitting resonator to the power receiving resonator and the adjustment mechanism. And an inductance adjustment control unit for generating an actuator control instruction. The inductance adjustment control unit includes a displacement setting unit for generating a control instruction so as to change the relative position stepwise in a state where the power supply device generates high-frequency power at a predetermined power transmission frequency, and a displacement setting And an optimum position search unit for searching for an optimum position corresponding to the relative position at which the power transmission efficiency is maximized from the power transmission efficiency at each of the relative positions changed stepwise by the unit.

  More preferably, the control device executes an optimum position search by the displacement setting unit and the optimum position searching unit at the start of power transmission processing from the power supply facility to the power receiving device, and adjusts the position of the movable member by the adjustment mechanism. Then, the power transmission process is executed. In particular, the output power from the power supply device when searching for the optimum position is smaller than the output power from the power supply device during power transmission processing.

  Alternatively, preferably, each of the power transmitting resonator and the power receiving resonator has an adjustment mechanism. Then, the inductance adjustment control unit includes a relative position of the movable member of the power transmission side electromagnetic shield with respect to the primary self-resonant coil in the adjustment mechanism of the power transmission resonator, and power reception with respect to the secondary self-resonance coil in the adjustment mechanism of the power reception resonator. The relative position of the movable member of the side electromagnetic shield is controlled in common.

  Preferably, a plurality of movable members are provided with different materials. The adjustment mechanism is configured such that the relative position with respect to the primary self-resonant coil can be independently controlled for each of the plurality of movable members. More preferably, the plurality of movable members include first and second movable members made of different materials, and the conductivity of the first movable member is higher than the conductivity of the second movable member, The magnetic permeability of the second movable member is higher than the magnetic permeability of the first movable member.

  According to the present invention, it is possible to realize a mechanism capable of adjusting a resonance frequency in a non-contact power feeding resonance system without providing a variable capacitor.

1 is an overall configuration diagram of a non-contact power feeding system according to an embodiment of the present invention. It is a conceptual diagram explaining the structural example of the adjustment mechanism shown in FIG. It is a front view which shows the example of arrangement | positioning of the through-hole and air hole which were provided in the shield board. It is a conceptual diagram explaining the change characteristic of the inductance according to the displacement of a shield board. It is a flowchart explaining the example of the control processing procedure of the non-contact electric power feeding using the inductance adjustment mechanism in the non-contact electric power feeding system by embodiment of this invention. It is a flowchart explaining the detailed process sequence of an inductance adjustment process. It is a flowchart explaining the modification of the control processing procedure of the non-contact electric power feeding using the inductance adjustment mechanism in the non-contact electric power feeding system by embodiment of this invention. It is a conceptual diagram explaining the modification of a structure of an adjustment mechanism. It is a schematic block diagram of the hybrid vehicle shown as an example of the electric vehicle carrying the power receiving apparatus shown in FIG.

  Embodiments of the present invention will be described below in detail with reference to the drawings. In the following, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated in principle.

  FIG. 1 is an overall configuration diagram of a non-contact power feeding system according to an embodiment of the present invention. With reference to FIG. 1, the non-contact power feeding system includes a control device 40, a power feeding facility 100, and a power receiving device 110.

  The power supply facility 100 includes a high frequency power supply device 10, a power meter 15, a coil unit 20, and an adjustment mechanism 50.

  The high frequency power supply device 10 is connected to the primary coil 25 via the wattmeter 15 and can generate a predetermined high frequency voltage (for example, about several MHz to several tens MHz) based on a drive signal received from the control device 40. The high frequency power supply device 10 is composed of a sine wave inverter circuit, for example, and is controlled by the control device 40.

  The coil unit 20 includes a primary coil 25 and a primary self-resonant coil 30. The coil unit 20 on the primary side constitutes an embodiment of a “power transmission resonator”.

  The primary coil 25 is disposed substantially coaxially with the primary self-resonant coil 30 and is configured to be magnetically coupled to the primary self-resonant coil 30 by electromagnetic induction. The primary coil 25 feeds high-frequency power supplied from the high-frequency power supply device 10 to the primary self-resonant coil 30 by electromagnetic induction.

  The primary self-resonant coil 30 is an LC resonant coil whose both ends are open (not connected), and resonates with a secondary self-resonant coil 70 (described later) of the power receiving device 110 via an electromagnetic field so as not to contact the power receiving device 110. Transmit power. The capacitor C1 can be configured by the stray capacitance of the primary self-resonant coil 30, but a capacitor element may actually be provided.

  The wattmeter 15 detects power P <b> 1 supplied from the high frequency power supply device 10 to the coil unit 20, i.e., transmission power P <b> 1 transmitted by the power supply facility 100.

  The adjusting mechanism 50 is provided to adjust at least the inductance of the primary self-resonant coil 30 in order to change the resonance frequency determined by the inductance L1 and the capacitance C1 of the primary self-resonant coil 30. In consideration of the coupling due to electromagnetic induction between the primary coil 25 and the primary self-resonant coil 30, the adjusting mechanism 50 may be provided to adjust the inductances of both the primary coil 25 and the primary self-resonant coil 30. preferable.

  Power reception device 110 includes a coil unit 60, a wattmeter 75, and an adjustment mechanism 80. The coil unit 60 includes a secondary coil 65 and a secondary self-resonant coil 70. The secondary coil unit 60 constitutes an embodiment of a “power receiving resonator”.

  Similarly to the primary self-resonant coil 30, the secondary self-resonant coil 70 is an LC resonant coil having both ends open. By resonating with the primary self-resonant coil 30 via an electromagnetic field, electric power is supplied from the power supply equipment 100 in a contactless manner. Receive power. The capacitor C2 can also be configured by the stray capacitance of the secondary self-resonant coil 70, but a capacitor element may be actually provided.

  The secondary coil 65 is disposed substantially coaxially with the secondary self-resonant coil 70 and is configured to be magnetically coupled to the secondary self-resonant coil 70 by electromagnetic induction. The secondary coil 65 is configured to take out the electric power received by the secondary self-resonant coil 70 by electromagnetic induction.

  The wattmeter 75 detects the power P <b> 2 supplied to the secondary coil unit 60, i.e., the power P <b> 2 received by the power receiving device 110.

  The adjustment mechanism 80 is provided to adjust at least the inductance of the secondary self-resonant coil 70 in order to change the resonance frequency determined by the inductance L2 and the capacitance C2 of the secondary self-resonant coil 70. In consideration of the coupling due to electromagnetic induction between the secondary coil 65 and the secondary self-resonant coil 70, the adjustment mechanism 80 adjusts the inductances of both the secondary coil 65 and the secondary self-resonant coil 70. It is preferable to be provided.

  The control device 40 is constituted by, for example, a CPU (Central Processing Unit) (not shown) and an electronic control unit (ECU: Electronic Control Unit) with a built-in memory, and based on a map and a program stored in the memory, a predetermined calculation is performed. It is configured to perform processing. Alternatively, at least a part of the ECU may be configured to execute predetermined numerical / logical operation processing by hardware such as an electronic circuit.

  The control device 40 generates a drive signal for controlling the high frequency power supply device 10 and outputs the generated drive signal to the high frequency power supply device 10. Then, the control device 40 controls the power supply from the primary self-resonant coil 30 to the secondary self-resonant coil 70 of the power receiving device 110 by controlling the high-frequency power supply device 10.

  Further, control device 40 receives transmission power P1 and reception power P2 detected by power meters 15 and 75. Instead of the configuration in which the power is directly detected by the wattmeters 15 and 75, the transmission power P1 and / or the reception power P2 may be obtained by arithmetic processing based on the current detection value and the voltage detection value by the current sensor and the voltage sensor. Good. Further, the control device 40 generates a control instruction SC for controlling inductance adjustment by the adjustment mechanisms 50 and 80. The inductance adjustment by the adjustment mechanisms 50 and 80 will be described in detail later.

  In the configuration example of FIG. 1, the control device 40 is shown as a component that comprehensively controls the power supply facility 100 and the power receiving device 110. However, it is also possible to provide a control part related to the power supply facility 100 in the control device 40 as a component of the power supply facility 100, or to provide a control part related to the power reception device 110 in the control device 40 as a component of the power reception device 110. It is.

  In the non-contact power feeding system shown in FIG. 1, two LC resonance coils having the same natural frequency resonate in an electromagnetic field (near field) in the same manner as two tuning forks resonate. Electric power is transmitted to the other coil via an electromagnetic field.

  Specifically, the power supply facility 100 supplies high-frequency power of a predetermined frequency from the high-frequency power supply device 10 to the primary self-resonant coil 30 that is magnetically coupled to the primary coil 25 by electromagnetic induction. The primary self-resonant coil 30, which is an LC resonator with the inductance L 1 of the coil itself and the capacitor C 1, is connected to the secondary self-resonant coil 70 having the same resonance frequency as the primary self-resonant coil 30 via an electromagnetic field (near field). Resonate.

  Then, energy (electric power) moves from the primary self-resonant coil 30 to the secondary self-resonant coil 70 via the electromagnetic field. The energy (electric power) moved to the secondary self-resonant coil 70 is taken out by the secondary coil 65 magnetically coupled to the secondary self-resonant coil 70 by electromagnetic induction and supplied to the load 120.

  In the non-contact power feeding system shown in FIG. 1, the resonance frequency of the primary self-resonant coil 30 and the secondary self-resonant coil 70 is designed to be the same frequency. The resonance frequency preferably matches the frequency of the high-frequency power output from the high-frequency power supply device 10 (power transmission frequency).

  However, there is a possibility that the resonance frequency of the resonance system changes according to a change with time of the distance between the primary self-resonant coil 30 and the secondary self-resonant coil 70 and the installation state. Alternatively, the resonance frequency of the resonance system may be different between the primary side (power feeding side) and the secondary side (power receiving side). When such a change in the resonance frequency occurs, there is a concern that the power transmission efficiency (η = P2 / P1) indicated by the ratio of the received power P2 at the power receiving apparatus to the transmitted power P1 from the power supply facility 100 may decrease.

  Therefore, in the non-contact power feeding system according to the present invention, the adjustment mechanism 50, 80 is provided in at least one of the power feeding facility 100 and the power receiving device 110, so that the primary side (power feeding side) and / or the secondary side (power receiving side) are provided. Adjust the resonance frequency.

FIG. 2 is a conceptual diagram illustrating a configuration example of the adjusting mechanisms 50 and 80 shown in FIG.
Referring to FIG. 2, on the primary side (feeding facility 100), primary coil 25 and primary self-resonant coil 30 are configured by coils that are coaxially wound in an annular shape. In addition, an electromagnetic shield 55 configured to house the primary coil 25 and the primary self-resonant coil 30 is provided. The electromagnetic shield 55 is provided with an opening toward the coil unit 60, more specifically, the secondary self-resonant coil 70. The electromagnetic shield 55 is made of a material (for example, copper or ferrite) that can shield electromagnetic waves. Thereby, in particular, the electromagnetic wave generated by the primary self-resonant coil 30 can be efficiently applied to the secondary self-resonant coil 70 without leaking outside.

  A part of the electromagnetic shield 55 is constituted by a shield plate 56 that can be moved by an external force. That is, the shield plate 56 corresponds to an example of a “movable member”. On the other hand, since the primary coil 25 and the primary self-resonant coil 30 constituting the coil unit 20 are fixed, the distance D between the shield plate 56 and the coil unit 20, that is, the shield plate with respect to the coil unit 20 due to the displacement of the shield plate 56. The relative position of 56 changes.

  In the configuration example of FIG. 2, the shield plate 56 is configured to move as the screw portion of the worm gear 54 fitted and inserted into the through hole 58 of the shield plate 56 rotates. Further, the shield plate 56 may be further provided with an air hole 57 so that the shield plate 56 moves smoothly as the worm gear 54 rotates.

FIG. 3 shows a front view of the shield plate 56 whose cross section is shown in FIG.
Referring to FIG. 3, air hole 57 is provided around through hole 58 provided at the center of shield plate 56. In general, electromagnetic waves generated by the primary coil 25 and the primary self-resonant coil 30 are low in strength near the central portion on the coil axis, and therefore leak even if these holes are provided in the central portion of the shield plate 56. the influence of the electromagnetic wave is not so large.

  Referring again to FIG. 2, the worm gear 54 is configured to rotate by the output of the motor 52. That is, the motor 52 is shown as a representative example of an actuator that can be controlled by the control device 40 to generate the displacement force of the shield plate 56. For example, the motor 52 is configured by a servo motor whose output is controlled in accordance with a control instruction SC from the control device 40.

  As a result, the distance D between the shield plate 56 and the coil unit 20 can be set by the control instruction SC. In this way, if the displacement of the shield plate 56 (movable member) is automatically controlled by the actuator, the inductance adjustment becomes easier. In this case, the adjustment mechanism 50 (FIG. 1) is constituted by the motor 52 and the worm gear 54.

  The inductances of the coils (the primary coil 25 and the primary self-resonant coil 30) can be adjusted according to the change in the relative position (distance D) due to the displacement of the shield plate 56 as described above.

  With reference to FIG. 4, when the shield plate 56 is displaced from the state of the distance D = d0 (reference value) so as to be close to the coil unit 20, that is, when the distance D is reduced, the inductance L is obtained at d = d0. It changes from the reference inductance L0. The change characteristics at that time vary depending on the material of the shield plate 56.

  Specifically, when the shield plate 56 is made of a material having high magnetic permeability (for example, ferrite), the inductance increases as the distance D decreases as indicated by the characteristic line 500. The degree of increase (change rate) also varies depending on the material (magnetic permeability) of the shield plate 56.

  On the contrary, when the shield plate 56 is made of a material having high conductivity (for example, copper), as indicated by the characteristic line 501, the inductance decreases as the distance D decreases.

  As described above, the adjusting mechanism 50 is configured to change at least the relative position (distance D) of the shield plate 56 with respect to the coil unit 20 by the displacement of the shield plate 56, and at least according to the characteristics that differ depending on the material of the shield plate 56. The inductance L1 of the primary self-resonant coil 30 can be changed. In the configuration example of FIG. 2, the inductances of both the primary coil 25 and the primary self-resonant coil 30 can be adjusted in the same direction according to the distance D.

  Here, the resonance frequency fr1 of the primary self-resonant coil 30 is expressed by the following equation (1) using the inductance L1 and the capacitance C1.

fr1 = 1 / (2π · (L1 · C1) ^1/2 ) (1)
Therefore, even when the resonance frequency fr1 in the primary resonance system deviates from the original design value, the resonance frequency fr1 can be changed by adjusting the inductance L1 by the adjustment mechanism 50.

  Similarly, on the secondary side (the power receiving device 110), the secondary coil 65 and the secondary self-resonant coil 70 are configured by coils that are coaxially wound in an annular shape. In addition, an electromagnetic shield 85 configured to house the secondary coil 65 and the secondary self-resonant coil 70 is provided. The electromagnetic shield 85 is provided with an opening toward the coil unit 20, more specifically, the primary self-resonant coil 30.

  Similarly to the electromagnetic shield 55, the electromagnetic shield 85 is made of a material (for example, copper or ferrite) that can shield electromagnetic waves, and a part of the electromagnetic shield 85 is made of a shield plate 86 that can be moved by an external force. . That is, the shield plate 86 corresponds to a “movable member”.

  As with the shield plate 56, the shield plate 86 is provided with an air hole 87 and a through hole 88 in the center (FIG. 3). Further, the shield plate 86 is configured to move as the thread portion of the worm gear 84 inserted into the through hole 88 rotates.

  Since the secondary coil 65 and the secondary self-resonant coil 70 constituting the coil unit 60 are fixed, the displacement D of the shield plate 86 and the distance D between the shield plate 86 and the coil unit 60, that is, the shield plate 86 with respect to the coil unit 60 are fixed. The relative position of changes.

  The worm gear 84 is configured to rotate by the output of the motor 82. That is, similarly to the motor 52, the motor 82 is shown as a representative example of an actuator that can be controlled by the control device 40 to generate the displacement force of the shield plate 86. For example, the motor 82 is configured by a servo motor whose output is controlled in accordance with a control instruction SC from the control device 40.

  As a result, the distance D between the shield plate 86 and the coil unit 60 can be specified by the control instruction SC. As described above, if the displacement of the shield plate 86 (movable member) is automatically controlled by the actuator, the following inductance adjustment becomes easier. In this case, the motor 82 and the worm gear 84 constitute an adjustment mechanism 80 (FIG. 1).

  The adjustment mechanism 80 can also change at least the inductance L2 of the secondary self-resonant coil 70 by displacement of the shield plate 86, that is, by changing the relative position (distance D) of the shield plate 86 with respect to the coil unit 60. . In the configuration example of FIG. 2, the inductances of both the secondary coil 65 and the secondary self-resonant coil 70 can be adjusted in the same direction according to the distance D. Further, the change characteristics of the inductance according to the change of the distance D are the same as those described with reference to FIG. 4, and therefore detailed description will not be repeated.

  The resonance frequency fr2 of the secondary self-resonant coil 70 is expressed by the following equation (2) using the inductance L2 and the capacitance C2.

fr2 = 1 / (2π · (L2 · C2) ^1/2 ) (2)
Therefore, also in the secondary resonance system, the resonance frequency fr2 can be changed by adjusting the inductance L2 by the adjustment mechanism 80.

  As described above, in the non-contact power feeding system according to this embodiment, the displacement of the movable member (shield plates 56 and 86) configured by a part of the electromagnetic shield mechanism is adjusted, so that the variable capacitor is not disposed. In addition, a mechanism capable of adjusting the resonance frequency in the resonance system of non-contact power feeding can be realized.

  Furthermore, in the non-contact power feeding system according to this embodiment, the control device 40 can realize power transmission processing incorporating inductance adjustment control.

  Referring to FIG. 2 again, control device 40 includes an efficiency calculation unit 42 and an inductance adjustment control unit 45 in order to control adjustment mechanisms 50 and 80. The inductance adjustment control unit 45 includes a displacement pattern setting unit 46 and an optimum position searching unit 47. The functional blocks of the efficiency calculation unit 42, the inductance adjustment control unit 45, the displacement pattern setting unit 46, and the optimum position search unit 47 are software processing by execution of a predetermined program in the control device 40 or a dedicated electronic circuit construction. It can be realized by any of the hardware processing according to.

  The efficiency calculating unit 42 calculates the transmission efficiency η (η = P2 / P1) according to the ratio of the received power P2 to the transmitted power P1 during power transmission by the high frequency power supply device 10. In the configuration example of FIG. 1, the power transmission efficiency η can be calculated based on the detection values of the wattmeters 15 and 75.

  The inductance adjustment control unit 45 outputs a control instruction SC for controlling the relative position (distance D) of the shield plates 56 and 86 with respect to the coil units 20 and 60 in order to perform the inductance adjustment process in response to the instruction signal CO. appear. As described above, the control instruction SC is given to the actuators (motors 52 and 82) of the adjustment mechanisms 50 and 80.

  When the instruction signal CO is generated, the displacement pattern setting unit 46 generates a control instruction SC so as to change the distance D in the adjustment mechanisms 50 and 80 stepwise according to a predetermined pattern. In response to this, the distance D in the adjusting mechanisms 50 and 80 is sequentially set in n stages of D = d1 to dn (n: integer) according to a predetermined pattern.

  The high frequency power supply device 10 outputs high frequency power at a predetermined power transmission frequency during the inductance adjustment process. However, the power at this time is preferably smaller than the power in normal power transmission processing.

  The inductance adjustment control unit 45 can acquire the power transmission efficiency η1 to ηn at the distances D = d1 to dn from the efficiency calculation unit 42, respectively. The optimum position searching unit 47 searches for the distance D at which the power transmission efficiency η is the highest value based on the power transmission efficiency η1 to ηn acquired in this way.

  For example, the distance D (any one of d1 to dn) corresponding to the highest value among the power transmission efficiencies η1 to ηn can be set as the distance dr (optimum distance) indicating the optimum position. Or the transition of power transmission efficiency (eta) 1- (eta) n is further considered, and the intermediate value between each point of d1-dn can also be made into the optimal distance dr. That is, the optimum distance dr indicates the relative position of the shield plates 56 and 86 with respect to the coil units 20 and 60 where the power transmission efficiency η is maximized.

  And the inductance adjustment control part 45 produces | generates the control instruction | indication SC to the adjustment mechanisms 50 and 80 so that it may become distance D = dr. As a result, when the adjustment process of the inductance is completed, the adjustment mechanisms 50 and 80 allow the resonance frequency of the primary self-resonant coil 30 and the secondary self-resonance coil 70 (that is, the resonance frequency of the resonance system) and the transmission efficiency η to be the highest value. It will be in the state adjusted to the frequency which becomes. By performing normal power transmission processing in such a state, non-contact power supply with ensured power transmission efficiency is possible.

  Next, a non-contact power supply control processing procedure using the inductance adjusting mechanism in the non-contact power supply system according to the embodiment of the present invention will be described with reference to FIGS. 5 and 6. Each step of the flowchart including FIG. 5 is basically realized by software processing by the control device 40, but may be realized by hardware processing.

  Referring to FIG. 5, when instructed to start non-contact power supply, control device 40 activates a series of control processes from step S100.

  In step S100, the control device 40 executes an inductance adjustment process for adjusting the resonance frequency of the resonance system prior to the start of the actual power transmission process. Thereby, the instruction signal CO in FIG. 2 is generated.

  FIG. 6 is a flowchart showing a detailed processing procedure of the inductance adjustment processing in S100 of FIG.

  Referring to FIG. 6, in step S110, control device 40 sets the output power of high-frequency power supply device 10 to a predetermined power during the inductance adjustment process. This predetermined power is set smaller than the transmitted power during normal power transmission processing.

  And the control apparatus 40 starts a predetermined measurement pattern by step S120. In this measurement pattern, for example, as described above, the distance D is set to n stages of d1 to dn.

  In step S122, the control device 40 sets the positions of the shield plates 56 and 86 according to the measurement pattern. For example, in the initial process after the start, a control instruction SC for setting the positions of the shield plates 56 and 86 is generated so that the distance D = d1. And the control apparatus 40 calculates power transmission efficiency (eta) ((eta) = P2 / P1) in the position (distance D) of the shield boards 56 and 86 set by step S122.

  When the setting of the distance D (S122) and the calculation of the corresponding power transmission efficiency η (S124) are finished, the control device 40 determines whether or not the measurement pattern is finished in step S125. If the distance D = dn, step S125 is determined YES, and the process proceeds in step S130.

  The control device 40 re-executes steps S122, S124, and S125 until the measurement pattern ends (when NO is determined in S125). Thereby, according to the measurement pattern, steps S122 to S125 are repeatedly executed until the transmission efficiency η1 to ηn at each of the distances D = d1 to dn is acquired.

  In step S <b> 130, the control device 40 determines an optimum distance dr indicating the optimum position of the shield plates 56 and 86 at which the power transmission efficiency η is maximum based on the power transmission efficiency η <b> 1 to ηn acquired along the measurement pattern. .

  In step S140, the control device 40 sets the positions of the shield plates 56 and 86 by generating control instructions SC for the adjusting mechanisms 50 and 80 according to the optimum position (optimum distance dr) determined in step S130. To do.

  Referring to FIG. 5 again, when the inductance adjustment process in step S100 ends, control device 40 executes a power transmission start process in step S200. Thereby, the output power of the high frequency power supply device 10 is set to the transmission power (standard value) at the time of normal power transmission processing. And the control apparatus 40 performs the power transmission process by normal electric power by step S300. That is, in the power transmission process in step S300, the positions of the shield plates 56 and 86 are adjusted according to the optimum positions, and the resonance frequencies of the primary self-resonant coil 30 and the secondary self-resonant coil 70 (that is, the resonance frequency of the resonance system) are adjusted. It is executed in the state.

  During normal power transmission in step S300, the control device 40 sequentially determines whether or not the power transmission end condition is ended in step S400.

  The power transmission end condition is established in response to, for example, a power transmission completion instruction (switch-off) by the user. Alternatively, when load 120 (FIG. 1) includes a power storage device (not shown) and non-contact power feeding is performed for charging the power storage device, a power transmission termination condition is established in response to the completion of charging. Also good. Alternatively, when it is detected that power transmission is impossible due to the positional relationship between the power supply facility 100 (primary self-resonant coil 30) and the power receiving device 110 (secondary self-resonant coil 70), the power transmission end condition is automatically set. It may be established.

  The control device 40 continues the power transmission process by repeatedly executing step S300 until the power transmission end condition is satisfied (when NO is determined in S400), while the power transmission end condition is satisfied (when YES is determined in S400). In step S500, the power transmission process is terminated.

  If the control processing procedure for contactless power feeding shown in FIG. 5 is followed, the power transmission processing can be executed after adjusting the resonance frequency of the resonance system to the optimum value by the inductance adjustment of the adjusting mechanisms 50 and 80 by automatic control. Therefore, even if the resonance frequency of the resonance system changes due to a change with time of the distance between the primary self-resonant coil 30 and the secondary self-resonant coil 70 or the installation situation, it is possible to prevent the power transmission efficiency from decreasing.

  As shown in FIG. 7, the inductance adjustment process may be periodically executed not only before the start of the power transmission process but also during the power transmission process.

  Referring to FIG. 7, the control device executes an inductance adjustment process before starting the power transmission process in step S100A, similarly to step S100 in FIG. 5. Then, when the inductance adjustment process (S100A) is completed, the control device 40 starts and executes a power transmission process using normal power through steps S200 and S300 similar to those in FIG. During normal power transmission in step S300, it is sequentially determined whether or not the power transmission end condition is ended in step S400 similar to FIG.

  When the power transmission end condition is not satisfied, that is, when the power transmission process is continued (NO determination in S400), control device 40 further determines whether or not the inductance adjustment process is necessary in step S450.

  For example, the inductance adjustment process is requested every elapse of a fixed time using a time measured value by a timer, that is, step S450 can be determined as YES. Alternatively, when the power transmission efficiency η (η = P2 / P1) is sequentially calculated during the power transmission process (S300) and the power transmission efficiency η is lower than a predetermined reference value, the resonance frequency shift occurs. Judgment may be made to request inductance adjustment processing, that is, step S450 may be determined as YES.

  When the inductance adjustment process is requested (when YES is determined in S450), the control device 40 executes the inductance adjustment process by generating the instruction signal CO of FIG. 2 in step S100B. Since the inductance adjustment processing in step S100B is the same as step S100 in FIG. 5, description thereof will not be repeated.

  However, in the inductance adjustment process in step S100B, the output power of the high-frequency power supply device 10 and the number of measurement pattern steps may be different from those in step S100A. As an example, the inductance adjustment process may be executed while maintaining normal transmission power, or the number of measurement pattern steps (n) may be smaller than in step S100A.

  On the other hand, control device 40 skips step S100B when the inductance adjustment process is unnecessary (NO in S450). In this way, the power transmission process (S300) is repeatedly executed after the inductance adjustment process is executed as required.

  5 to 7, in the non-contact power feeding system according to the embodiment of the present invention, the inductance adjustment process for setting the shield plates 56 and 86 (movable members) in the adjustment mechanisms 50 and 80 to the optimum positions. Can be automatically executed before the start of the power transmission process and / or during the power transmission process.

(Modification of the adjustment mechanism)
FIG. 8 shows a modification of the adjustment mechanisms 50 and 80.

  Referring to FIG. 8, according to the modification, adjustment mechanisms 50 and 80 each include a plurality of shield plates that are movable members. For example, the adjustment mechanism 50 is provided with shield plates 56a and 56b, and the adjustment mechanism 80 is provided with shield plates 86a and 86b. Although not shown, each of the shield plates 56a, 56b, 86a, 86b has worm gears 54, 84, air holes 57, 87, and through holes 58, 86, similarly to the shield plates 56, 58 of FIG. 88 is provided. That is, the shield plates 56a, 56b, 86a, 86b are configured to be displaceable by the same mechanism as the shield plates 56, 58 of FIG.

  On the primary side (power feeding facility 100), motors 52a and 52b are provided as independent actuators corresponding to the shield plates 56a and 56b, respectively. Independent control instructions SCa and SCb are given from the control device 40 to the motors 52a and 52b. That is, for the shield plates 56a and 56b, the relative position (distance Da, Da + Db) with respect to the coil unit 20 can be controlled independently.

  On the secondary side (power receiving device 110), similarly to the primary side, motors 82a and 82b are provided as independent actuators corresponding to the shield plates 86a and 86b, respectively. Independent control instructions SCa and SCb are given from the control device 40 to the motors 82a and 82b. That is, with respect to the shield plates 86a and 86b, the relative positions (distances Da and Da + Db) with respect to the coil unit 60 can be controlled independently.

  Thereby, the inductance adjustment in each of the adjustment mechanisms 50 and 80 can be executed more precisely.

  Further, in each of the adjusting mechanisms 50 and 80, the plurality of shield plates (56a and 56b and 86a and 86b) are preferably made of different materials.

  For example, when a material with high permeability (for example, ferrite) is applied to one shield plate, it is preferable to apply a reflective material (for example, copper) with high conductivity to the other shield plate. That is, the permeability of one shield plate is higher than the permeability of the other shield plate, while the conductivity of the other shield plate is higher than the conductivity of one shield plate. When combined in this way, as can be understood from the characteristics of FIG. 4, the adjustable range of inductance in each of the adjusting mechanisms 50 and 80 can be expanded.

(Application example to electric vehicles)
FIG. 9 is a configuration diagram of a hybrid vehicle shown as an example of an electric vehicle on which the power receiving device 110 shown in FIG. 1 is mounted.

  Referring to FIG. 9, hybrid vehicle 200 includes power storage device 210, system main relay SMR, boost converter 220, inverters 230 and 232, motor generators 240 and 242, engine 250, and power split device 260. Drive wheel 270. Hybrid vehicle 200 further includes a coil unit 60, a power meter 75, an adjustment mechanism 80, a charger 280, a charging relay CHR, and a vehicle ECU 290. The coil unit 60 includes a secondary coil 65 and a secondary self-resonant coil 70.

  Hybrid vehicle 200 includes engine 250 and motor generator 242 as power sources. Engine 250 and motor generators 240 and 242 are connected to power split device 260. Hybrid vehicle 200 travels by driving force generated by at least one of engine 250 and motor generator 242. The power generated by the engine 250 is divided into two paths by the power split device 260. That is, one is a path transmitted to the drive wheel 270 and the other is a path transmitted to the motor generator 240.

  Motor generator 240 is an AC rotating electric machine, and includes, for example, a three-phase AC synchronous motor in which a permanent magnet is embedded in a rotor. Motor generator 240 generates power using the kinetic energy of engine 250 via power split device 260. For example, when the state of charge of power storage device 210 (also referred to as “SOC (State Of Charge)”) becomes lower than a predetermined value, engine 250 is started and power is generated by motor generator 240 to store power. Device 210 is charged.

  The motor generator 242 is also an AC rotating electric machine, and, like the motor generator 240, is composed of, for example, a three-phase AC synchronous motor in which a permanent magnet is embedded in a rotor. Motor generator 242 generates driving force using at least one of the electric power stored in power storage device 210 and the electric power generated by motor generator 240. Then, the driving force of motor generator 242 is transmitted to driving wheel 270.

  In addition, when braking the vehicle or reducing acceleration on a downward slope, mechanical energy stored in the vehicle as kinetic energy or positional energy is used for rotational driving of the motor generator 242 via the drive wheels 270, and the motor generator 242 Operates as a generator. Thereby, motor generator 242 operates as a regenerative brake that converts running energy into electric power and generates braking force. The electric power generated by motor generator 242 is stored in power storage device 210.

  Power split device 260 includes a planetary gear including a sun gear, a pinion gear, a carrier, and a ring gear. The pinion gear engages with the sun gear and the ring gear. The carrier supports the pinion gear so as to be capable of rotating, and is connected to the crankshaft of engine 250. The sun gear is coupled to the rotation shaft of motor generator 240. The ring gear is connected to the rotating shaft of motor generator 242 and drive wheel 270.

  System main relay SMR is arranged between power storage device 210 and boost converter 220 and electrically connects power storage device 210 to boost converter 220 in response to a signal from vehicle ECU 290. Boost converter 220 performs DC voltage conversion between the voltage on positive line PL1 connected to power storage device 210 and the voltage on positive line PL2. Boost converter 220 is formed of, for example, a DC chopper circuit, and can control the voltage of positive line PL2 to be higher than the voltage of positive line PL1. Inverters 230 and 232 drive motor generators 240 and 242, respectively. Inverters 230 and 232 are formed of, for example, a three-phase bridge circuit.

  The correspondence relationship between FIG. 1 and FIG. 9 will be described. The hybrid vehicle 200 includes a power receiving device 110 (FIG. 1) according to this embodiment, that is, a coil unit 60 (secondary coil 65 and secondary self-resonant coil 70), An wattmeter 75 and an adjustment mechanism 80 are mounted. The charger 280 to the power storage device 210 correspond to the load 120 in FIG. Since the configuration and operation of power reception device 110 are the same as described above, detailed description thereof will not be repeated.

  Charger 280 is a power converter configured to convert AC power extracted by secondary coil 75 into charging power for power storage device 210. Charging relay CHR is arranged between charger 280 and power storage device 210, and electrically connects charger 280 and power storage device 210 in accordance with a signal from vehicle ECU 290.

  In the traveling mode, vehicle ECU 290 turns on system main relay SMR and turns off charging relay CHR. Then, vehicle ECU 290 generates signals for driving boost converter 220 and motor generators 240 and 242 based on signals from the accelerator opening, vehicle speed, and other various sensors when the vehicle is running, The signal is output to boost converter 220 and inverters 230 and 232.

  Further, the vehicle ECU 290 has a communication function with the control device 40 of the power supply facility 100. That is, it is possible to transmit the received power P <b> 2 detected by the wattmeter 75 to the control device 40 and to receive the control instruction SC for the actuator of the adjustment mechanism 80 from the control device 40.

  When power is supplied from power supply facility 100 (FIG. 1) to hybrid vehicle 200, vehicle ECU 290 turns on charge relay CHR. The system main relay SMR is basically turned off, but may be turned on as necessary.

  Thereby, power storage device 210 can be charged with the power received by secondary self-resonant coil 70. At that time, by controlling the adjustment mechanism 80 via the vehicle ECU 290, the power storage device 210 can be charged by non-contact power supply while ensuring power transmission efficiency by adjusting the resonance frequency of the resonance system. Alternatively, data and signals may be directly exchanged between the power supply facility 100 and the control device 40 without using the vehicle ECU 290.

  It is also possible to receive power from power supply facility 100 while the vehicle is running by turning on both system main relay SMR and charging relay CHR.

  Further, in the above, as an example of an electric vehicle equipped with power receiving device 110, a series / parallel type hybrid vehicle capable of dividing the power of engine 250 by power split device 260 and transmitting it to drive wheels 270 and motor generator 240. However, the present invention is also applicable to other types of hybrid vehicles.

  For example, the engine 250 is used only for driving the motor generator 240 and the driving force of the vehicle is generated only by the motor generator 242, so-called series type hybrid vehicle, or only regenerative energy among the kinetic energy generated by the engine 250 is used. The present invention can also be applied to a hybrid vehicle that is recovered as electric energy, a motor-assist type hybrid vehicle in which a motor assists the engine as the main power if necessary. In addition, the present invention can be applied to an electric vehicle that does not include engine 250 and travels only by electric power, and a fuel cell vehicle that further includes a fuel cell as a DC power supply in addition to power storage device 210.

  As described above, in the non-contact power feeding system according to the embodiment of the present invention, the shield plates 56 and 86 (movable members) constituting a part of the electromagnetic shield which is an indispensable component are displaced to be variable. The resonance frequency of the resonance system (self-resonant coils 30, 70) can be adjusted without providing a new element such as a capacitive element. This ensures power transmission efficiency even when the resonance frequency of the resonance system deviates from the initial design value due to a change in the distance between the primary self-resonant coil 30 and the secondary self-resonant coil 70 and the installation situation over time. It becomes possible.

  Furthermore, by using actuators (motors 52, 52a, 52b, 82, 82a, 82b) controlled by the control device 40, inductance adjustment by the adjustment mechanisms 50, 80 is facilitated. In particular, the adjustment mechanisms 50 and 80 can automatically execute an inductance adjustment process for setting the shield plates 56 and 86 (movable members) to the optimum positions. Furthermore, such an inductance adjustment process can be automatically executed at an appropriate timing (before starting the power transmission process and / or during the power transmission process) at the time of non-contact power feeding.

  In the above embodiment, in consideration of the symmetry between the power feeding side and the power receiving side, in the configuration in which both the adjusting mechanism 50 of the power feeding facility 100 and the adjusting mechanism 80 of the power receiving device 110 are provided, the adjusting mechanism 50, A configuration has been described in which the positions (distances D, Da, Db) of the shield plates 56, 86 (movable members) in each of 80 are controlled in common. However, in each of the adjusting mechanisms 50 and 80, the positions of the shield plates 56 and 86 (movable members) can be controlled independently.

  Moreover, although the above embodiment demonstrated the structure provided with both the adjustment mechanism 50 of the electric power feeding equipment 100 and the adjustment mechanism 80 of the power receiving apparatus 110 as a preferable aspect, only one of the adjustment mechanisms 50 and 80 is arrange | positioned. It is also possible in principle to adopt a configuration to do so.

  Further, the configuration in which the shield plates 56 and 86 are displaced by the worm gears 54 and 84 illustrated in FIG. 3 and the like is merely an example of a configuration example of the adjustment mechanism, and the coil units 20 and 60 (self-resonant coils 30 and 70) are used. On the other hand, if the shield plates 56 (56a, 56b), 86 (86a, 86b), which are movable members, can be displaced, any configuration can be adopted as the adjusting mechanisms 50, 80 for confirmation. To do.

  In the above-described embodiment, the primary self-resonant coil 30 is fed by electromagnetic induction using the primary coil 25 and the power is taken out from the secondary self-resonant coil 70 by electromagnetic induction using the secondary coil 65. However, the primary self-resonant coil 30 may be directly supplied with power from the high-frequency power supply device 10 without providing the primary coil 25, and the power may be directly taken out from the secondary self-resonant coil 70 without providing the secondary coil 65. That is, the primary side coil unit 20 may be configured by only the primary self-resonant coil 30, and the secondary side coil unit 60 may be configured by only the secondary self-resonant coil 70.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be applied to non-contact power feeding by resonance via an electromagnetic field between a power transmission side and a power reception side.

  DESCRIPTION OF SYMBOLS 10 High frequency power supply device, 15, 75 Wattmeter, 20 coil unit (primary side), 25 primary coil, 30 primary self-resonance coil, 40 control apparatus, 42 efficiency calculating part, 45 inductance adjustment control part, 46 displacement pattern setting part, 47 Optimal position search unit, 50, 80 adjustment mechanism, 52, 52a, 52b, 82, 82a, 82b Motor (actuator), 54, 84 Worm gear, 55, 85 Electromagnetic shield, 56, 56a, 56b, 86, 86a, 86b Shield plate (movable member), 57,87 Air hole, 58,88 Through hole, 60 Coil unit (secondary side), 65 Secondary coil, 70 Secondary self-resonant coil, 100 Power supply equipment, 110 Power receiving device, 120 Load , 200 hybrid vehicle, 210 power storage device, 220 step-up converter, 23 0,232 Inverter, 240,242 Motor generator, 250 Engine, 260 Power split device, 270 Driving wheel, 280 Charger, 500,501 Characteristic line (inductance change), C1, C2 capacity, CHR charging relay, CO instruction signal ( Inductance adjustment), D, Da, Db distance (shield plate to coil unit), P1 transmitted power, P2 received power, PL1, PL2 positive line, SC, SCa, SCb control instruction (actuator), SMR system main relay, η Transmission efficiency.

Claims (15)

A power supply device configured to output high-frequency power at a predetermined power transmission frequency;
A power transmission resonator for transmitting power from the power supply device to the power reception device in a non-contact manner by resonating with a power reception resonator of the power reception device via an electromagnetic field;
Said power transmission resonator,
A primary self-resonant coil configured to generate the electromagnetic field by being fed with the high-frequency power;
An electromagnetic shield configured to house the primary self-resonant coil and to be provided with an opening toward the power receiving resonator;
A non-contact power feeding, further comprising: an adjustment mechanism for adjusting an inductance of the primary self-resonant coil by displacing a movable member of the electromagnetic shield configured to be movable by an external force with respect to the primary self-resonant coil Facility. A control device for controlling the power supply device and the power transmission resonator;
The adjustment mechanism includes an actuator controlled by the control device for generating a displacement force of the movable member,
The controller is
An efficiency acquisition unit for obtaining power transmission efficiency from the power transmission resonator to the power reception resonator;
An inductance adjustment control unit for generating a control instruction of the actuator for controlling a relative position of the movable member with respect to the primary self-resonant coil,
The inductance adjustment control unit includes:
A displacement setting unit for generating the control instruction so as to change the relative position stepwise in a state where the power supply device generates the high-frequency power at the predetermined power transmission frequency;
An optimal position search unit for searching for an optimal position corresponding to the relative position at which the power transmission efficiency is maximized, from the power transmission efficiency at each of the relative positions changed stepwise by the displacement setting unit, The non-contact power feeding facility according to claim 1.   The control device performs a search for the optimum position by the displacement setting unit and the optimum position search unit when starting a power transmission process from the non-contact power feeding facility to the power receiving device, and determines the position of the movable member. The non-contact power supply facility according to claim 2, wherein the power transmission process is executed after the adjustment mechanism is controlled according to the optimum position.   The non-contact power supply facility according to claim 3, wherein output power from the power supply device at the time of searching for the optimum position is smaller than output power from the power supply device at the time of the power transmission process. The movable member is provided with a plurality of different materials,
The non-contact power supply facility according to any one of claims 1 to 4, wherein the adjustment mechanism is configured to be able to independently control a relative position with respect to the primary self-resonant coil for each of the plurality of movable members. The plurality of movable members have first and second movable members made of different materials,
The conductivity of the first movable member is higher than the conductivity of the second movable member, while the permeability of the second movable member is higher than the permeability of the first movable member. 5 non-contact power feeding equipment according. A power receiving resonator that receives power transmitted from the power transmitting resonator in a contactless manner by resonating with a power transmitting resonator that receives high frequency power from a power supply device, and an electromagnetic field,
The power receiving resonator includes:
Including a secondary self-resonant coil configured to receive power from the primary self-resonant coil by resonating with a primary self-resonant coil of the power transmission resonator via the electromagnetic field;
An electromagnetic shield configured to house the secondary self-resonant coil and to be provided with an opening toward the power transmitting resonator;
An adjustment mechanism for adjusting an inductance of the secondary self-resonant coil by displacing a movable member of the electromagnetic shield configured to be movable by an external force with respect to the secondary self-resonant coil; Contact power receiving device. A control device for controlling the power receiving resonator;
The adjusting mechanism further includes an actuator controlled by the control device for generating a displacement force of the movable member,
The controller is
An efficiency acquisition unit for obtaining power transmission efficiency from the power transmission resonator to the power reception resonator;
An inductance adjustment control unit for generating a control instruction of the actuator for controlling a relative position of the movable member with respect to the secondary self-resonant coil,
The inductance adjusting controller,
A displacement setting unit for generating the control instruction so as to change the relative position stepwise under the state where the power supply device generates the high-frequency power at the predetermined power transmission frequency;
An optimal position search unit for searching for an optimal position corresponding to the relative position at which the power transmission efficiency is maximized, from the power transmission efficiency at each of the relative positions changed stepwise by the displacement setting unit, non-contact power receiving apparatus according to claim 7 wherein. A power supply facility for transmitting predetermined high-frequency power;
A power receiving device for receiving power transmitted from the power supply equipment in a contactless manner;
The power supply equipment is
A power supply device configured to output high-frequency power at a predetermined power transmission frequency;
A power transmission resonator for transmitting high-frequency power from the power supply device to the power receiving device in a contactless manner by resonating via an electromagnetic field;
The power transmission resonator includes:
Having a primary self-resonant coil configured to generate the electromagnetic field by being fed with the high-frequency power;
The power supply equipment is
A power transmission side electromagnetic shield configured to store the primary self-resonant coil and to be provided with an opening toward the power receiving device;
The power receiving device is:
Including a power receiving resonator for receiving power transmitted from the power transmitting resonator in a contactless manner;
The power receiving resonator includes:
Having a secondary self-resonant coil configured to receive power from the primary self-resonant coil by resonating with a primary self-resonant coil of the power transmission resonator via the electromagnetic field;
The power receiving device is:
A power receiving-side electromagnetic shield configured to store the secondary self-resonant coil and to be provided with an opening toward the power transmitting resonator;
At least one of the power supply facility and the power receiving device is:
An adjustment mechanism for adjusting the inductance of the primary self-resonant coil or the secondary self-resonant coil;
The adjustment mechanism displaces a movable member configured to be movable by an external force of the power transmission side electromagnetic shield or the power reception side electromagnetic shield with respect to the primary self-resonance coil or the secondary self-resonance coil. A contactless power feeding system configured to adjust an inductance of the primary self-resonant coil or the secondary self-resonant coil. A control device for controlling the power supply equipment and the power receiving device;
The adjusting mechanism further includes an actuator controlled by the control device for generating a displacement force of the movable member,
The controller is
An efficiency acquisition unit for obtaining power transmission efficiency from the power transmission resonator to the power reception resonator;
An inductance adjustment control unit for generating a control instruction of the actuator for controlling a relative position of the movable member with respect to the primary self-resonance coil or the secondary self-resonance coil in the adjustment mechanism;
The inductance adjustment control unit includes:
A displacement setting unit for generating the control instruction so as to change the relative position stepwise under the state where the power supply device generates the high-frequency power at the predetermined power transmission frequency;
An optimal position search unit for searching for an optimal position corresponding to the relative position at which the power transmission efficiency is maximized, from the power transmission efficiency at each of the relative positions changed stepwise by the displacement setting unit; The contactless power feeding system according to claim 9.   The control device performs a search for the optimum position by the displacement setting unit and the optimum position search unit when starting a power transmission process from the power supply facility to the power receiving device, and adjusts the position of the movable member. The contactless power feeding system according to claim 10, wherein the power transmission process is executed after the mechanism is controlled according to the optimum position.   The non-contact power feeding system according to claim 11, wherein output power from the power supply device at the time of searching for the optimum position is smaller than output power from the power supply device at the time of the power transmission process. Each of the power supply facility and the power receiving device has the adjustment mechanism,
The inductance adjustment control unit includes a relative position of a movable member of the power transmission side electromagnetic shield with respect to the primary self-resonant coil in the adjustment mechanism of the power transmission resonator, and the second adjustment mechanism in the adjustment mechanism of the power reception resonator. The non-contact electric power feeding system of any one of Claims 10-12 which controls commonly the relative position of the movable member of the said receiving side electromagnetic shield with respect to a secondary self-resonance coil. The movable member is provided with a plurality of different materials,
The adjustment mechanism according to any one of claims 9 to 13, wherein each of the plurality of movable members is configured to be able to independently control a relative position with respect to the primary self-resonant coil or the secondary self-resonant coil. The non-contact power feeding system described. The plurality of movable members have first and second movable members made of different materials,
The conductivity of the first movable member is higher than the conductivity of the second movable member, while the permeability of the second movable member is higher than the permeability of the first movable member. 14. The non-contact power feeding system according to 14.

Images