JP2013115909A - Contactless power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contactless power supply device capable of transmitting electric power from a power supply side to a power reception side efficiently while relaxing precision of a stop position of a moving body even when using moving means having a simple driving mechanism.SOLUTION: Power supply-side facilities 10 include a first resonator 11, and a power supply part 12 which supplies an alternating current to the first resonator 11. Power reception-side facilities 21 include a second resonator 22 and a load supplied with electric power that the second resonator 22 receives. The first resonator 11 and the second resonator 22 have phases matched in a state of contactless power transmission so that electric power is transmitted with maximum efficiency in such position relation that both the resonators 11 and 22 are not closest to each other, but deviate by a preset distance from the state in which they are closest to each other. The power supply-side facilities 10 includes moving means 13 of moving the first resonator 11 by a uniaxial driving mechanism to a position which corresponds to a stop position of a vehicle 20 and at which the electric power can be transmitted with the maximum efficiency.

Description

  The present invention relates to a contactless power supply device, and more particularly to a contactless power supply device that supplies power from a power supply side to a power reception side in a contactless manner by magnetic coupling between coils.

  As a non-contact power feeding device, a non-contact power feeding device that supplies power from the power feeding side to the power receiving side using electromagnetic induction between the primary coil on the power feeding side and the secondary coil on the power receiving side is known. This type of non-contact power feeding device is expected to expand its use as a power feeding device (charging device) for charging a battery (secondary battery) mounted on an electric vehicle or a hybrid vehicle.

  In a non-contact charging system for a vehicle using a non-contact power supply device, a primary coil on the power supply side is installed on the ground, and a secondary coil on the vehicle side is installed outside the floor surface of the vehicle body. In order to perform charging efficiently in a vehicle non-contact charging system using a non-contact power feeding device, it is necessary to strictly limit the allowable range of positional deviation and gap length change between the power feeding unit and the power receiving unit. However, it is difficult to accurately stop the vehicle at a predetermined position, and the system forcing it is difficult for ordinary people to use.

  2. Description of the Related Art Conventionally, a power transmission device (power feeding device) is configured to rotate between a chargeable position and a standby position by a drive device around a support shaft, and the power transmission device is in a state where the vehicle is stopped at a predetermined stop position. Has been proposed in which charging is performed by rotating the battery from a standby position to a chargeable position (see Patent Document 1).

JP 2007-189769 A

  In the charging system of Patent Literature 1, the power transmission device is rotated from the standby position to the chargeable position while the vehicle travels on a preset route and stops at a charging place along the traveling route. Therefore, compared to stopping the vehicle at a predetermined stop position with the power transmission device as a target, the vehicle can be easily stopped at the predetermined stop position with high accuracy. However, in order for charging to be performed efficiently, it is premised on that the vehicle is accurately stopped at a predetermined stop position.

  In order to detect the stop position of the vehicle and move the power feeding device to the position where charging is performed efficiently, the power feeding device can be moved in the X and Y directions, or a combination of linear movement and rotation can be used. It is necessary to move up to the distance, which complicates the drive device for movement.

  The present invention has been made in view of the above-described conventional problems. The object of the present invention is to efficiently supply power in a state where the accuracy of the stop position of the moving body is relaxed even if simple moving means is used for the driving mechanism. An object of the present invention is to provide a non-contact power feeding device that can transmit power from the power source to the power receiving side.

  In order to achieve the above object, the invention according to claim 1 is a non-contact power feeding device that performs non-contact power feeding in a state in which the moving body is stopped from a power feeding side facility to a power receiving side facility mounted on the moving body. It is. And the said electric power feeding side installation is provided with the 1st resonator and the power supply part which supplies alternating current to the said 1st resonator, The said electric power receiving side installation is the 2nd resonator, and the said 2nd resonator And a load to which the power received is supplied. The first resonator and the second resonator have a maximum efficiency in a positional relationship in which the two resonators are not closest to each other but in a predetermined distance from the state in the state in which the non-contact power transmission is performed. The matching is adjusted so that power transmission is performed in The non-contact power feeding apparatus transmits power at a maximum efficiency corresponding to a stop position of the moving body, in a state where the non-contact power transmission is performed, with respect to one of the first resonator and the second resonator. A moving means that can be moved to a possible position by a single-axis drive mechanism is provided.

  Conventionally, in the non-contact power feeding device, the primary side and the secondary side have been adjusted so that power is transferred with maximum efficiency in a state where the primary side coil and the secondary side coil are closest to each other. When the secondary side is mounted on the mobile body, it is necessary to tighten the accuracy of the stop position of the mobile body in order to perform power transmission with the target transmission efficiency. However, according to the present invention, the first resonator and the second resonator are not in a state in which both resonators are closest to each other in a state in which contactless power transmission is performed, but in a positional relationship that is deviated by a preset distance from that state. Is adjusted so that power transmission is performed with maximum efficiency. Then, one of the first resonator and the second resonator is moved by the moving means corresponding to the stop position of the moving body. The position to be moved is not limited to a position where the power can be transmitted with the maximum efficiency, but may be a position where the power can be transmitted with the target transmission efficiency or higher. Therefore, even if a moving means with a simple driving mechanism is used, it is possible to efficiently transmit power from the power feeding side to the power receiving side while reducing the accuracy of the stop position of the moving body.

  According to a second aspect of the present invention, in the first aspect of the present invention, the moving means has the first resonator or the second resonator at a position other than the center of the coils of the two resonators. Revolve around the axis. In the present invention, the first resonator or the second resonator is revolved so as to be moved to a position where electric power can be transmitted at or above the intended transmission efficiency. Therefore, the stop allowable range of the moving body is wider than in the case of linear movement.

  According to a third aspect of the present invention, in the second aspect of the present invention, the moving means is provided in the power supply side facility. When the moving means is provided in the power receiving side facility, the moving body is increased in size, or the degree of freedom of the installation space for other devices constituting the moving body is reduced. In addition, when the moving means is provided in the power receiving side equipment, it is necessary to provide all the moving bodies equipped with the power receiving side equipment, but when provided in the power feeding side equipment, regardless of the number of moving bodies using the power feeding side equipment, The number of moving means can be one.

  According to the present invention, even when a moving unit with a simple driving mechanism is used, it is possible to efficiently transmit power from the power feeding side to the power receiving side while reducing the accuracy of the stop position of the moving body.

(A) is a schematic diagram of the non-contact charge system of one Embodiment, (b) is a schematic top view which shows the positional relationship of a primary coil and a secondary coil. Schematic which shows the relationship between a 1st resonator and a 2nd resonator. (A), (b) is the schematic for demonstrating an effect | action. (A), (b) is a schematic diagram for demonstrating an effect | action. (A), (b) is a schematic diagram which shows the position of the revolution center of a 1st resonator when the stop position shift range of a vehicle is made into the square area | region of the front-back, left-right direction. (A), (b) is a schematic diagram showing the position of the revolution center of the first resonator when the stop position deviation range of the vehicle is a square area in the front-rear and left-right directions and the left-right direction is long. (A), (b) is a schematic diagram showing the position of the revolution center of the first resonator when the stop position deviation range of the vehicle is a square area in the front-rear and left-right directions and the left-right direction is long. (A), (b) is a schematic diagram showing the position of the revolution center of the first resonator when the stop position deviation range of the vehicle is a square area in the front-rear and left-right directions and the left-right direction is long. The schematic diagram of another embodiment. (A) is a schematic diagram of another embodiment, (b) is a schematic diagram showing the relationship between the first resonator and the second resonator. The schematic diagram of another embodiment.

  Hereinafter, an embodiment in which the present invention is embodied in a non-contact charging system for charging an in-vehicle battery will be described with reference to FIGS. As shown in FIG. 1 (a), a non-contact charging system as a non-contact power feeding device includes a power feeding side equipment 10 provided on the ground side and a power receiving side equipment 21 mounted on a vehicle 20 as a moving body. Has been.

  The power supply side equipment 10 includes a first resonator 11, a power supply unit 12 that supplies alternating current to the first resonator 11, a moving means 13 that moves the first resonator 11, and a power supply side controller 14. I have. The first resonator 11 includes a primary side coil 15, a capacitor C <b> 1 connected to the primary side coil 15, and a magnetic core 16. The primary coil 15 is wound around the magnetic core 16 a plurality of times to form a multilayer coil. Both ends of the magnetic core 16 are formed so as to protrude from both ends of the primary coil 15.

  The power supply unit 12 outputs an alternating current with a predetermined frequency to the first resonator 11 according to a command from the power supply side controller 14. The moving means 13 moves the first resonator 11 to a position where power can be transmitted with maximum efficiency corresponding to the stop position of the vehicle 20 in a state where non-contact power transmission is performed.

  The moving means 13 includes a motor 17 and a support arm 18 that is rotated by the motor 17, and supports the magnetic core 16 at one end of the support arm 18 via a non-magnetic member. That is, the moving means 13 moves the first resonator 11 to a position where power can be transmitted with maximum efficiency corresponding to the stop position of the vehicle 20 by a single-axis drive mechanism. The motor 17 revolves around a shaft other than the center of the coil of the first resonator 11, that is, the primary side coil 15, in this embodiment, around the output shaft 17 a of the motor 17, according to a command from the power supply side controller 14. .

  The power receiving side equipment 21 is mounted on the rear part of the vehicle 20, and is disposed, for example, under a license plate (not shown). The power receiving side equipment 21 includes a second resonator 22, a rectifier 23, a charger 24, a battery (secondary battery) 25 connected to the charger 24, and a vehicle side controller 26. The rectifier 23, the charger 24, and the battery 25 constitute a load. The charger 24 includes a DC / DC converter (not shown) that converts the direct current rectified by the rectifier 23 into a voltage suitable for charging the battery 25. The vehicle-side controller 26 controls the switching element of the DC / DC converter of the charger 24 during charging. The power supply side controller 14 and the vehicle side controller 26 can communicate with each other via a wireless communication device (not shown).

  The second resonator 22 includes a secondary side coil 27, a capacitor C <b> 2 connected to the secondary side coil 27, and a magnetic core 28. The secondary coil 27 is wound around the magnetic core 28 a plurality of times to form a multi-layer coil. Both ends of the magnetic core 28 are formed so as to protrude from both ends of the secondary coil 27.

  As shown in FIGS. 1 (a) and 1 (b), the first resonator 11 and the second resonator 22 are composed of a central axis of the primary coil 15 and the magnetic core 16, a secondary coil 27, and a magnetic core. The central axis of the body core 28 extends in the vertical direction and is provided so as to have the same height.

  The first resonator 11 and the second resonator 22 do not have the maximum efficiency in the position relationship where the two resonators are not closest to each other but in a predetermined distance from the state in the state in which contactless power transmission is performed. The matching is adjusted so that power transmission is performed. The preset distance is, for example, the location where the power supply side equipment 10 is provided and the stop position space of the vehicle 20, the capabilities and sizes of the first resonator 11 and the second resonator 22, the target transmission efficiency, and the like. Is set in consideration of Then, when the power supply side controller 14 performs the non-contact power transmission, that is, when the vehicle 20 stops at the charging position and receives the charge request signal from the vehicle side controller 26, the moving means 13 causes the first resonator 11 to move. The vehicle 20 is moved to a position where power can be transmitted with maximum efficiency corresponding to the stop position of the vehicle 20.

  The power supply side controller 14 determines whether or not the first resonator 11 has moved to a position where power can be transmitted with maximum efficiency based on the reflected power and the power factor. In this embodiment, the power supply unit 12 includes reflected power detection means (not shown) that detects the reflected power from the primary coil 15. The power supply side controller 14 can monitor the reflected power via the reflected power detection means, and when the first resonator 11 is moved to the feeding position, the first resonator is placed at a position where the reflected power is minimized. 11 is moved.

Next, the operation of the non-contact charging system configured as described above will be described.
When the driver determines that the battery 25 needs to be charged, the driver 20 stops the vehicle 20 at a predetermined position of the power supply side equipment 10. Then, a charging request (power supply request) is communicated (notified) to the power supply controller 14 using a communication device (not shown).

  When the power supply side controller 14 receives the charge request from the vehicle 20, before starting the non-contact power transmission, the power source side controller 14 outputs a drive command to the motor 17 so that the first resonator 11 exceeds the preset transmission efficiency. Move to a position where power can be transmitted efficiently. The power supply side controller 14 monitors the reflected power detection means of the power supply unit 12 and moves the first resonator 11 to a position where the reflected power is minimized.

  Then, in a state where the first resonator 11 is moved to a position suitable for power transmission, the power supply controller 14 outputs an alternating current with a predetermined frequency to the first resonator 11 to the power supply unit 12. The power supply unit 12 outputs an alternating current with a predetermined frequency to the primary side coil 15. When alternating current is supplied to the primary coil 15, the magnetic core 16 is magnetized by the magnetic field generated by the current flowing through the primary coil 15, and magnetic poles are generated at both ends thereof. Depending on the direction of the current flowing through the primary coil 15, the N pole and S pole of the magnetic pole generated in the magnetic core 16 are determined, and each time the current direction changes, the magnetic core as shown in FIG. The state in which the N pole is generated at the lower end of S16 and the S pole is generated in the upper end and the state in which the N pole is generated at the upper end of the magnetic core 16 and the S pole is generated at the lower end are repeated as shown in FIG. In a state where the N pole is generated at the lower end of the magnetic core 16 and the S pole is generated at the upper end, the S pole is generated at the lower end of the magnetic core 28, the N pole is generated at the upper end, and the N pole is formed at the upper end of the magnetic core 16. In the state where the S pole is generated at the lower end, the S pole is generated at the upper end of the magnetic core 28 and the N pole is generated at the lower end. And the state of Fig.3 (a) and the state of FIG.3 (b) are repeated by a resonance cycle, and electric power transmission is performed non-contactingly with the secondary side coil 27 of the receiving side installation 21. FIG. The electric power received by the secondary coil 27 is rectified by the rectifier 23 and then supplied to the charger 24, which is boosted to a voltage suitable for charging the battery 25 by the charger 24 and supplied to the battery 25. Is charged.

  In the state where the magnetic core 16 is present, the magnetic poles are at both ends of the magnetic core 16 regardless of the number of turns of the primary coil 15 and the length of the magnetic core 16 where the primary coil 15 is wound. Ideally, no magnetic pole is generated in the intermediate portion of the magnetic core 16. In the magnetic core 28, the magnetic pole is generated at the end of the magnetic core 28 and not at the intermediate portion. Then, power transmission is performed by magnetic coupling between the magnetic poles of the magnetic core 16 and the magnetic core 28.

  For example, the vehicle-side controller 26 determines the completion of charging based on the elapsed time from when the voltage of the battery 25 reaches a predetermined voltage, and transmits a charging completion signal to the power-side controller 14 when the charging is completed. The power supply side controller 14 will complete | finish electric power transmission, if a charge completion signal is received. Even when the driver requests the end of charging before the battery is fully charged, a power supply end request is transmitted to the power supply side controller 14, and the power supply side controller 14 ends the power transmission.

  In the prior art in which contactless power transmission is performed by resonance, the first resonator 11 and the second resonator 22 are closest to each other, that is, between the central axes of the magnetic core 16 and the magnetic core 28 in FIG. The first resonator 11 and the second resonator 22 are adjusted so that the power transmission becomes maximum efficiency when the distance L is minimum, and an allowable range of deviation is set based on that state. To do. Therefore, the allowable range of deviation of the stop position of the vehicle 20 is narrowed.

  On the other hand, in this embodiment, the first resonator 11 and the second resonator 22 are not closest to each other, but transmit power with maximum efficiency in a positional relationship shifted from that state by a preset distance. Are adjusted to match. Therefore, the allowable range of deviation of the stop position of the vehicle 20 can be widened. More specifically, in FIG. 4A, the center of the primary coil 15 and the magnetic core 16 of the first resonator 11 is on the circumference of a circle 40 indicated by a two-dot chain line centering on the output shaft 17a. It is movable. A state where the centers of the secondary coil 27 and the magnetic core 28 of the second resonator 22 are located on the circumference of a circle 41 having a radius r indicated by a thick broken line, for example, a state shown in FIG. That is, when the distance d between the magnetic core 16 and the magnetic core 28 is the same as the radius r of the circle 41, the power transmission is in the maximum efficiency. Therefore, as long as the center of the secondary coil 27 and the magnetic core 28 is located within a circle 42 indicated by a broken line, the primary coil 15 and the magnetic core 16 are driven by driving the motor 17 at any position. It can be moved to a state where power transmission is at maximum efficiency. FIG. 4B shows a state where the primary coil 15 and the magnetic core 16 have moved to a position where the power transmission becomes maximum efficiency when the vehicle 20 stops in the state of FIG. The coil 15 and the magnetic core 16 move to the power transmission position along the path indicated by the arrow 45.

According to this embodiment, the following effects can be obtained.
(1) The non-contact charging system as the non-contact power feeding device performs non-contact power feeding in a state where the vehicle 20 is stopped from the power feeding side facility 10 to the power receiving side facility 21 mounted on the vehicle 20. The power supply side equipment 10 includes a first resonator 11 and a power supply unit 12 that supplies an alternating current to the first resonator 11, and the power receiving side equipment 21 includes a second resonator 22 and a second resonator. And a load to which power received by the power supply 22 is supplied. The first resonator 11 and the second resonator 22 are not in a state in which both resonators 11 and 22 are closest to each other in a state in which contactless power transmission is performed, but in a positional relationship that is deviated by a preset distance from that state. The matching is adjusted so that power transmission is performed with maximum efficiency. In the state where non-contact power transmission is performed, the power supply side equipment 10 moves the first resonator 11 to a position where power can be transmitted with maximum efficiency corresponding to the stop position of the vehicle 20 by a single-axis drive mechanism. Means 13 are provided. Therefore, even if a moving means with a simple drive mechanism is used, it is possible to efficiently transmit power from the power feeding side to the power receiving side while reducing the accuracy of the stop position of the vehicle 20.

  (2) The moving means 13 revolves the first resonator 11 around an axis at a position other than the centers of the coils of the first resonator 11 and the second resonator 22. Therefore, compared with the case where the first resonator 11 is moved by linear movement to a position where electric power can be transmitted with a transmission efficiency equal to or higher than the intended transmission efficiency, the stop allowable range of the vehicle 20 is widened.

  (3) The moving means 13 is provided in the power supply side equipment 10. If the moving means 13 is provided in the power receiving side equipment 21, the size of the vehicle 20 is increased, or the degree of freedom of the installation space for other devices constituting the vehicle 20 is reduced. Moreover, when providing the moving means 13 in the power receiving side equipment 21, it is necessary to provide in all the vehicles 20 carrying the power receiving side equipment 21, but when providing in the power feeding side equipment 10, the vehicle 20 using the power feeding side equipment 10 is used. Regardless of the number, the number of moving means 13 can be one.

  (4) The first resonator 11 and the second resonator 22 include magnetic cores 16 and 28, respectively. Therefore, compared with the case where the magnetic cores 16 and 28 are not provided, a strong magnetic field is generated and power transmission can be performed stably.

  (5) The power receiving side equipment 21 is mounted on the vehicle 20, and the vehicle 20 includes a rectifier 23 and a battery 25 as loads. It is difficult for the driver to accurately stop the vehicle 20 on which the power receiving side equipment 21 is mounted to charge the battery 25 at a position where the non-contact power feeding is performed efficiently. However, since the power receiving side equipment 21 has a wide allowable range of the stop position where the non-contact power feeding is efficiently performed, the burden on the vehicle stop operation by the driver is reduced.

  (6) The power receiving side equipment 21 is mounted on the rear part of the vehicle 20. Therefore, as compared with the case where the power receiving side equipment 21 is mounted on another part of the vehicle 20, for example, a side surface of the vehicle body or under the floor of the vehicle 20, it is easy to secure a mounting space and a predetermined stop position for charging. When the vehicle 20 is stopped, the stop operation becomes easy. Moreover, installation of the power supply side equipment 10 is also simplified.

The embodiment is not limited to the above, and may be embodied as follows, for example.
○ The allowable range of misalignment between the magnetic core 16 of the first resonator 11 and the magnetic core 28 of the second resonator 22 is not limited to a circle, as shown in FIGS. 5 (a) and 5 (b). It may be a rectangle. FIGS. 5A and 5B show a case where the output shaft 17a is positioned at the center of the rectangular positional deviation allowable range A1. In this case, if the radius r of the circle 41 is equal to or greater than the shortest distance between the outer periphery of the circle 40 and the corner of the allowable range A1, the magnetic core 16 can be moved regardless of the position of the magnetic core 28 in the allowable range A1. It can be moved to a position where power transmission is at maximum efficiency. FIG. 5B shows a state in which the primary coil 15 and the magnetic core 16 have moved along the path indicated by the arrow 45 to a position where the power transmission becomes maximum efficiency when the vehicle 20 stops in the state of FIG. Is shown.

  6 (a) and 6 (b) show the allowable misalignment range A2 for the vehicle 20 when the wheel stopper is used and the displacement of the vehicle 20 in the front-rear direction is small and the displacement in the left-right direction is large. One form when it is set as the square area | region long in the left-right direction is shown. 6A and 6B, the vertical direction is the horizontal direction of the vehicle 20. Also in this embodiment, the output shaft 17a is arranged in a state of being positioned at the center of the rectangular positional deviation allowable range A2. Also in this case, as long as the radius r of the circle 41 is equal to or greater than the shortest distance between the outer periphery of the circle 40 and the corner of the allowable range A2, the magnetic core 16 can be moved regardless of the position of the magnetic core 28 in the allowable range A2. It can be moved to a position where power transmission is at maximum efficiency. FIG. 6B shows a state where the primary coil 15 and the magnetic core 16 have moved along the path indicated by the arrow 45 to a position where the power transmission becomes maximum efficiency when the vehicle 20 stops in the state of FIG. Is shown.

  FIGS. 7A and 7B show the positional deviation allowable range A2 corresponding to the case where the positional deviation in the front-rear direction of the vehicle 20 is small and the lateral deviation is large by using the wheel stopper. The example of a change at the time of setting it as the square area | region long in the left-right direction is shown. 7A and 7B, the vertical direction is the horizontal direction of the vehicle 20. In this embodiment, the output shaft 17a is disposed not in the center of the rectangular positional deviation allowable range A2, but in a state of being closer to the front than the center (leftward in FIGS. 7A and 7B). FIG. 7B shows a state where the primary coil 15 and the magnetic core 16 have moved along the path indicated by the arrow 45 to a position where the power transmission becomes maximum efficiency when the vehicle 20 stops in the state shown in FIG. Is shown.

  8 (a) and 8 (b), the position of the output shaft 17a is closer to the front than the center of the rectangular displacement allowable range A2 than in the case of FIGS. 7 (a) and 7 (b) (FIG. 8 (a)). The example of a change arrange | positioned in the state located to the left of (b) is shown. FIG. 8B shows a state in which the primary coil 15 and the magnetic core 16 have moved along the path indicated by the arrow 45 to a position where the power transmission becomes maximum efficiency when the vehicle 20 stops in the state shown in FIG. Is shown. In this case, the amount of movement of the primary coil 15 and the magnetic core 16 can be reduced compared to the case shown in FIGS. 7 (a) and 7 (b).

  As shown in FIG. 9, even if the power receiving side equipment 21 is mounted on the vehicle 20 with the central axis of the secondary coil 27 and the magnetic core 28 of the second resonator 22 extending in the front-rear direction of the vehicle 20. Good. In this case, the first resonator 11 of the power supply side equipment 10 is disposed in a hole 31 formed on the ground. The motor 17 is installed in a state where the output shaft 17a extends in parallel with the longitudinal direction of the vehicle 20 stopped at the charging position, and the primary side coil 15 and the magnetic core 16 are parallel to the secondary side coil 27 and the magnetic core 28. The state is moved to the standby position and the power feeding position. The opening of the hole 31 is covered with a cover (not shown) so as not to hinder the movement of the vehicle 20.

  ○ In the state where contactless power transmission is performed, the contactless charging system has a maximum efficiency corresponding to one of the first resonator 11 and the second resonator 22 corresponding to the stop position of the moving body (vehicle 20). It is only necessary to provide a moving means that can be moved by a single-axis drive mechanism at a position where power can be transmitted. Further, the moving means that can be moved by the single-axis drive mechanism is not limited to the structure that is moved only by rotating the shaft, but may be the structure that can be moved only by linear movement. For example, as shown in FIG. 10A, the power receiving side equipment 21 is connected to the vehicle 20 in a state where the central axes of the secondary coil 27 and the magnetic core 28 of the second resonator 22 extend in the front-rear direction of the vehicle 20. It may be configured to be mounted and horizontally movable in the left-right direction (vehicle width direction) of the vehicle 20 in a state where the secondary coil 27 and the magnetic core 28 are maintained in the state of extending in the front-rear direction. The magnetic core 28 is supported by a support body 19 that can be linearly moved in the vehicle width direction by a drive mechanism (not shown) via a non-magnetic member 19a. As the drive mechanism, for example, a cylinder or a ball screw mechanism is used. In this case, when the relationship between the magnetic core 16 of the first resonator 11 and the magnetic core 28 of the second resonator 22 is shown, the magnetic core 28 is straight when the vehicle 20 is stopped at the charging position. As shown in FIG. 10B, the moving path is in a state of intersecting the circumference of a circle 41 having a radius r centering on the centers of the primary coil 15 and the magnetic core 16. In a state where the center of the magnetic core 28 is located on the circumference of the circle 41, the power transmission is in a maximum efficiency state.

  The mounting position of the power receiving side equipment 21 with respect to the vehicle 20 is not limited to the rear portion of the vehicle 20, and may be mounted, for example, on the front portion or the middle portion of the vehicle 20. When mounted on the front part, it is mounted in the same manner as when mounted on the rear part. However, when mounted on the intermediate part, for example, as shown in FIG. 27 and the magnetic material core 28 are mounted so that the central axes thereof extend in parallel to the ground surface and in the vehicle width direction. Further, the first resonator 11 of the power supply side equipment 10 is disposed in a hole 31 formed on the ground. The motor 17 is installed in a state where the output shaft 17 a extends in parallel with the vehicle width direction of the vehicle 20 stopped at the charging position, and the primary side coil 15 and the magnetic body core 16 are parallel to the secondary side coil 27 and the magnetic body core 28. In this state, it is moved to the standby position and the power feeding position. In the embodiment shown in FIG. 11, the secondary coil 27 is connected to the charger 24, and the charger 24 has a built-in rectifier.

  Even when the power receiving side equipment 21 is mounted on the vehicle 20 with the secondary coil 27 of the second resonator 22 and the central axis of the magnetic core 28 extending in the front-rear direction of the vehicle 20, the second resonator 22 may be arranged in the middle part of the vehicle 20. Further, the vehicle 20 is positioned at a position corresponding to the intermediate portion of the vehicle 20 stopped at a predetermined position of the power supply side equipment 10 with respect to the primary coil 15 and the magnetic core 16 of the first resonator 11 of the power supply side equipment 10. You may arrange | position in the state extended in the front-back direction.

The second resonator 22 may be provided on the side portion of the vehicle 20.
The primary side coil 15 and the secondary side coil 27 are not limited to the multi-layer winding but may be a single layer winding.
The magnetic cores 16 and 28 do not need to have a length penetrating the primary side coil 15 or the secondary side coil 27, and may be shorter than the lengths of the primary side coil 15 and the secondary side coil 27. Good.

  ○ Instead of the capacitor C1 connected to the primary coil 15 and the capacitor C2 connected to the secondary coil 27 as the first resonator 11 and the second resonator 22, the primary coil 15 and the secondary side The parasitic capacitance of the coil 27 may be substituted for the capacitor.

  When performing non-contact power transmission, the central axis of the primary side coil 15 and the magnetic core 16 of the first resonator 11 and the center of the secondary side coil 27 and the magnetic core 28 of the second resonator 22 The configuration is not limited to the configuration in which the shafts are arranged in parallel to each other, and may be slightly deviated from the parallel state.

The magnetic core 16 and the magnetic core 28 may be omitted. However, it is preferable that the magnetic core 16 and the magnetic core 28 exist.
In the power supply side facility 10 and the power reception side facility 21, the centers of the primary side coil 15 and the magnetic core 16 and the centers of the secondary side coil 27 and the magnetic core 28 may not be the same height.

O When the power receiving side equipment 21 is mounted on the rear part of the vehicle 20, the mounting position may be on the upper side instead of the lower side of the license plate.
○ When the power controller 14 monitors the reflected power via the reflected power detection means and moves the first resonator 11 to the feeding position, the reflected power is set in advance instead of the position where the reflected power is minimized. The first resonator 11 may be moved to a position that is less than or equal to the threshold value.

The vehicle 20 is not limited to a vehicle that requires a driver, and may be an automatic guided vehicle, for example.
The non-contact power feeding device is not limited to the one used for charging the battery 25 mounted on the vehicle, and may be a mobile body including a battery, for example, a self-propelled robot.

When the charging position to the battery 25 is indoors, the first resonator 11 of the power supply side equipment 10 may be provided above the stop position of the moving body during charging, for example, on the ceiling.
The battery 25 may be directly charged after the AC current output from the secondary coil 27 is rectified by the rectifier 23 without providing the charger 24.

The power supply unit 12 may be capable of changing the frequency of the AC output or not.
○ In a state where non-contact power transmission is performed, one of the first resonator 11 and the second resonator 22 is placed in a position where power can be transmitted with maximum efficiency corresponding to the stop position of the moving body. Instead of using the moving means 13 that can be moved by this driving mechanism, the moving mechanism 13 may be moved to a position that is slightly less efficient than the maximum efficiency, for example, a position that is 90% or more of the maximum efficiency.

  ○ Even when the moving body (for example, the vehicle 20) stops at a place where an efficiency equal to or higher than a certain threshold cannot be obtained, either the first resonator 11 or the second resonator 22 is moved by the drive mechanism. An efficiency equal to or higher than a threshold value may be obtained.

  ○ As shown in FIGS. 1A and 1B, the first resonator 11 and the second resonator 22 are composed of the central axis of the primary side coil 15 and the magnetic core 16, and the secondary side coil. 27 and the central axis of the magnetic core 28 may extend in the vertical direction, and the moving unit 13 may be provided in the power receiving side equipment 21 to move the second resonator 22.

  ○ As in the configuration shown in FIG. 10A, the vehicle 20 is kept in a state where the central axes of the secondary coil 27 and the magnetic core 28 of the second resonator 22 extend in the front-rear direction of the vehicle 20. Instead of being horizontally movable in the left-right direction, the primary coil 15 and the magnetic core 16 of the first resonator 11 may be configured to be horizontally movable in the left-right direction of the vehicle 20.

The following technical idea (invention) can be understood from the embodiment.
(1) In the invention according to any one of claims 1 to 3, the first resonator and the second resonator include a coil, a capacitor connected to the coil, and a magnetic body. With a core.

(2) In the invention according to any one of claims 1 to 3 and the technical idea (1), the moving body is a vehicle.
(3) In the invention described in the technical idea (2), the vehicle includes a rectifier and a battery as the load.

  (4) In the invention described in the technical idea (2) or (3), the moving means linearly moves the second resonator.

  d, L ... distance, 10 ... power supply side equipment, 11 ... first resonator, 12 ... power source, 13 ... moving means, 21 ... power receiving side equipment, 22 ... second resonator.

Claims (3)

A non-contact power feeding device that performs non-contact power transmission in a state where the moving body is stopped with respect to a power receiving side facility mounted on the moving body from a power feeding side facility,
The power supply side facility includes a first resonator, and a power supply unit that supplies alternating current to the first resonator,
The power receiving side facility includes a second resonator, and a load to which the power received by the second resonator is supplied,
The first resonator and the second resonator have a maximum efficiency in a positional relationship in which the two resonators are not closest to each other but in a predetermined distance from the state in the state in which the non-contact power transmission is performed. Is adjusted so that power can be transmitted at
In the state in which the non-contact power transmission is performed, one of the first resonator and the second resonator is placed at a position where power can be transmitted with maximum efficiency corresponding to the stop position of the moving body. A non-contact power feeding device comprising a moving means that can be moved by a shaft drive mechanism.   The contactless power feeding device according to claim 1, wherein the moving unit revolves the first resonator or the second resonator around an axis at a position other than a center of a coil of both resonators.   The non-contact power feeding apparatus according to claim 2, wherein the moving unit is provided in the power feeding side facility.