• 专利附录
  • 专利说明
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    • 专利摘要:
    CONTACT-FREE ELECTRICITY SUPPLY DEVICE. This non-contact electricity supply device, which carries out contactless battery charging (28) of a vehicle, is provided with: an electricity transmission coil (12) arranged on a road surface; and an electricity receiving coil (22) arranged on the vehicle. A foreign object detection coil (13) is provided on the upper surface of the electricity transmission coil (12), and based on the induced voltage that appears on the foreign object detection coil (13) during a test electricity supply , foreign objects between the electricity transmission coil (12) and the electricity receiving coil (22) are detected.
    公开号:BR112013005804B1
    申请号:R112013005804-8
    申请日:2012-05-23
    公开日:2020-12-08
    发明作者:Kengo Maikawa；Tomoya Imazu
    申请人:Nissan Motor Co., Ltd；
    IPC主号:
    专利说明:

    Technical Field
    [001] The present invention relates to a non-contact electricity supply device. Fundamental Technique
    [002] An electricity supply system is illustrated including: an energy supply device; a power receiving device for receiving contactless energy from the power supply device; an efficiency sensor device for perceiving a transmission efficiency between the energy supply device and the energy receiving device; a determination device to determine whether or not the perceived transmission efficiency is above a prescribed value; and a control device to determine that the normal electricity supply is impeded by an obstacle, etc., in response to a condition in which the perceived transmission efficiency is below the prescribed value, and the temporary suspension of the device's power supply power supply, and restarting the power supply for a small amount of energy for a prescribed period of time after suspension (see patent document 1).
    [003] However, since transmission efficiency can be reduced when the power supply coil and the power receiving coil are shifted in position with each other, it is impossible to accurately detect based on the change in efficiency of transmission of a foreign object entering between the energy supply coil and the energy receiving coil. Prior Art Documents Patent Documents
    [004] Patent Document 1: JP 2010-119246 A. Summary of the Invention
    [005] It is an objective of the present invention to provide a non-contact electricity supply device that is capable of detecting the presence of a foreign object between an energy supply coil and an energy receiving coil. Means for solving problems
    [006] In accordance with the present invention, a non-contact electricity supply device comprises: a third coil provided on a surface of a second coil, where the surface faces a first coil; and a foreign object detection means that detects a foreign object between the first coil and the second coil based on an induced voltage occurring on the third coil.
    [007] In accordance with the present invention, it is possible to detect a foreign object by perceiving the induced voltage of the third coil, since the foreign object causes a change in a magnetic flux that passes through the third coil when the foreign object is present between the first coil and the second coil. Brief Description of Drawings
    [008] Figure 1 is a block diagram of a non-contact electricity supply system according to an embodiment of the present invention.
    [009] Figure 2 is a block diagram of a part of the non-contact electricity supply system in Figure 1 that includes an electricity supply device, an energy receiving coil, a rectifier, and a battery.
    [010] Figure 3 is a diagram to illustrate an induced voltage occurring in a foreign object detection coil in the electricity supply system, not counted in figure 1.
    [011] Figure 4 is a plan view of a power supply unit included in the electricity supply system, not counted in Figure 1.
    [012] Figure 5 is a cross-sectional view taken along line V-V in figure 4.
    [013] Figure 6 is a cross-sectional view taken along line VI-VI in figure4.
    [014] Figure 7 is a plan view of the power supply unit included in the non-contact electricity supply system in Figure 1.
    [015] Figure 8 is a plan view of the power supply unit included in the non-contact electricity supply system in Figure 1.
    [016] Figure 9 is a plan view of a power supply unit included in a non-contact electricity supply system in accordance with a modification of the present invention.
    [017] Figure 10 is a plan view of a power supply unit included in a non-contact electricity supply system according to another embodiment of the present invention.
    [018] Figure 11 is a plan view of a power supply unit included in a non-contact electricity supply system according to another embodiment of the present invention.
    [019] Figure 12 is a diagram to illustrate an induced current flowing through the foreign object detection coil in figure 11.
    [020] Figure 13 is a graph shining a time characteristic of the induced voltage occurring in the foreign object detection coil. Modes of Carrying Out the Invention
    [021] The following describes the modalities of the present invention with reference to the drawings. First Mode
    [022] Figure 1 is a block diagram of a non-contact electricity supply system including a vehicle 200 and an electricity supply device 100, which includes a non-contact electricity supply device according to one embodiment of the present invention. A vehicle side unit of the contactless electricity supply device of the modality is mounted on an electric vehicle, but can be mounted on a hybrid electric vehicle or similar.
    [023] As illustrated in figure 1, the non-contact electricity supply system of this modality includes vehicle 200 and the vehicle side unit, and electricity supply device 100 is a ground side unit. In this system, power is supplied without contact from the electricity supply device 100 which is supplied at an electricity supply station or the like, to charge a battery 28 which is supplied in vehicle 200.
    [024] The electricity supply device 100 includes a power control section 11, a power supply coil 12, a foreign object detection coil 13, a wireless communication section 14, and a control section 15 The electricity supply device 100 is a ground-side unit that is provided in a parking space where vehicle 200 is parked, and supplies energy by supplying non-contact electricity between the coils when vehicle 200 is parked in a specified parking position.
    [025] The power control section 11 is a circuit for converting an alternating current energy sent from an alternating current energy source 300 to a high frequency alternating current energy, and sending from the same to the power supply coil 12. The power control section 11 includes a rectification section 111, a PFC (Power Factor Correction) circuit 112, an inverter 113, and a sensor 114. The rectification 111 is a circuit that is electrically connected to the alternating current power source 300, and rectifies the alternating current energy sent from the alternating current power source 300. The PFC circuit 112 is a circuit for improving the power factor by formatting the waveform sent from rectification section 111, and is connected between rectification section 111 and inverter 113. Inverter 113 is an energy conversion circuit that includes a capacitor of smoothing, and a switching element such as an IGBT. Inverter 113 converts direct current energy into high frequency alternating current energy based on a switching control signal from control section 15, and supplies it to the power supply coil 12. The sensor 114 is connected between PFC circuit 112 and inverter 113, and senses current and voltage. The power supply coil 12 is a non-contact power supply coil for an energy receiving coil 22 that is provided in the vehicle 200. The power supply coil 12 is provided in a parking space where the non-contact electricity supply of this modality is provided.
    [026] When vehicle 200 is parked in a specified parking position, the power supply coil 12 is positioned below the power supply coil 22 some distance from the power supply coil 22. The power coil of energy 12 is a circular coil that is parallel to the surface of the parking space.
    [027] The foreign object detection coil 13 is a coil for detecting a foreign object between the power supply coil 12 and the energy receiving coil 22.The foreign object detection coil 13 is controlled by the control 15. A power supply unit 101 includes power supply coil 12 and foreign object detection coil 13, and is provided on the floor of the specified parking space. When the vehicle 200 is parked in the specified parking space, the position of which is suitable for charging by means of the non-contact electricity supply device of this modality, the power supply unit 101 is positioned between the rear wheels of the vehicle 200. The construction specific to the power supply unit 101 is described below.
    [028] Wireless communication section 14 performs bidirectional communication with a wireless communication section 24 which is provided on vehicle 200. Wireless communication section 14 is provided on electricity supply device 100 on the ground side. The communication frequency between wireless communication section 14 and wireless communication section 24 is determined to be higher than the frequency used for communication between a signal receiving section and a signal sending section, and also more high give the frequency used by a vehicle peripheral device such as a smart key. Accordingly, the vehicle's peripheral device is unlikely to be subjected to interference due to communication between wireless communication section 14 and wireless communication section 24. Communication between wireless communication section 14 and wireless communication section 14 wireless communication 24 is implemented by a wireless LAN system or similar.
    [029] Control section 15 is a section for controlling the entire electricity supply device 100. Control section 15 includes a foreign object detection section 151, and controls energy control section 11, the power supply 12, foreign object detection coil 13, and wireless communication section 14. Control section 15 sends a control signal to vehicle 200 indicating a start of power supply from the supply device electricity 100, and receives a control signal from the vehicle 200 indicating a request to receive power from the electricity supply device 100, for communication between wireless communication section 14 and wireless communication section 24. The communication section control 15 performs the switching of the inverter control 113, and, in this way, controls the energy supplied from the power supply coil 12, depending on a current perceived by sensor 114.
    [030] Vehicle 200 includes the power receiving coil 22, the wireless communication section 24, a charging control section 25, a rectifying section 26, a relay section 27, a battery 28, an inverter 29 , an engine 30, and a notification section 32. The energy receiving coil 22 is provided on the bottom surface (chassis) or similar of vehicle 200, and between the rear wheels of vehicle 200. When vehicle 200 is parked in position specified parking space, the energy receiving coil 22 is positioned above the energy supply coil 12 for some distance from the energy supply coil 12. The energy receiving coil 22 is a circular coil that is parallel to the surface of the parking space.
    [031] The rectifying section 26 is connected to the energy receiving coil 22, and consists of a rectifying circuit to rectify to a direct current or an alternating current received in the energy receiving coil 22. The retransmission section 27 includes a relay switch that is turned on and off under the control of the charge control section 25. When the relay switch is turned off, the relay section 27 separates an upper power system including battery 28 from a lower power system including the energy receiving coil 22 and the rectifying section 26 which constitutes a circuit section for charging.
    [032] Battery 28 is composed of a plurality of secondary cells connected to each other, and serves as a vehicle power source 200. Inverter 29 is a control circuit such as a PWM control circuit including a switching element such as an IGBT. The inverter 29 converts a direct current energy sent by the battery 28 to an alternating current energy and supplies it to the motor 30, depending on a switching control signal. Motor 30 is a three-phase alternating current or similar motor, and serves as a driving source for driving vehicle 200.
    [033] Notification section 32 consists of a warning lamp and a monitor or speaker for a navigation system, and sends light, image or sound, etc. for a user, under the control of the loading control section 25.
    [034] The charge control section 25 is a controller for controlling battery charging 28. The charge control section 25 controls the signal sending section, the wireless communication section 24, the object detection coil strange 13, and the notification section 32, and includes an energy measurement section 251. The charge control section 25 sends a signal indicating the start of charging to control section 15, by communication between the communication section without wire 24 and the wireless communication section 14. The charge control section 25 is connected via a CAN communication network to a non-illustrated controller that controls the entire vehicle 200. This controller manages the switching control of the inverter 29 and the charge state (SOC) of the battery 28. The control section 15 sends to the control section 15 a signal indicating a charging end, depending on the SOC of the battery 28, when the full charge is reached.
    [035] In the non-contact electricity supply device of this modality, the energy supply and energy receipt of the high frequency energy is implemented by electromagnetic induction between the energy supply coil 12 and the energy receiving coil 22 which are out of touch with each other. In other words, when a voltage is applied to the power supply coil 12, then the magnetic coupling occurs between the power supply coil 12 and the power receiving coil 22, so that energy is supplied from the power coil. of energy 12 for the energy receiving coil 22.
    [036] The following describes a configuration for detecting a foreign object between the power supply coil 12 and the power receiving coil 22 with reference to figure 2. Figure 2 is a block diagram of a part of the contactless electricity supply device of this modality which includes the electricity supply device 100, the energy receiving coil 22, the rectifying section 26, and the battery 28.
    [037] As illustrated in figure 2, the foreign object detection coil 13 includes a plurality of foreign object detection coils 13. The foreign object detection coil 13 is arranged between the power supply coil 12 and the coil receiving power 22, and on the surface of the power supply coil 12. In other words, the coil plane of the power supply coil 12, the coil plane of the power receiving coil 22, and the coil plane of the foreign object detection coil 13 are arranged to be parallel to each other, and the coil plane of the foreign object detection coil 13 is included in the coil plane of the power supply coil 12.
    [038] The foreign object detection section 151 includes a voltage perception section 1511, and a foreign object identification section 1512. The voltage perception section 1511 is connected to the foreign object detection coil 13, and perceives an induced voltage occurring on the foreign object detection coil 13. The voltage perception section 1511 sends a perceived voltage to the foreign object identification section 1512. The foreign object identification section 1512 compares the perceived voltage with an imitate value voltage, and thereby determines whether or not a foreign object is present between the power supply coil 12 and the power receiving coil 22, and sends a determination result to the power control section 11 and the wireless communication section 14. When it is determined by the foreign object identification section 1512 that a foreign object is present, then the control section 15 controls the power control section 1 1 based on a control signal containing the determination result, in order to suspend the electricity supply from the power supply coil 12. If the electricity supply is performed when a foreign object is present between the power supply coil 12 and energy receiving coil 22, it is possible that a magnetic flux passing through the foreign object causes a swirling current to flow through the foreign object, and thus heats the foreign object. Accordingly, in the present modality, the electricity supply is controlled in order to be suspended in response to the detection of a foreign object.
    [039] Furthermore, in response to the detection of a foreign object, the control section 15 sends through the wireless communication section 14 to the vehicle 200 a signal indicating that the foreign object is detected. The load control section 25 notifies the user of the presence of the foreign object by controlling the notification section 32 based on the signal received by the wireless communication section 24. This allows the user to recognize the presence of the foreign object by the notification a from notification section 32.
    [040] The following describes a principle for the detection of a foreign object according to the present modality with reference to figures 2 and 3. Figure 3 is a diagram to illustrate an induced voltage generated by a magnetic flux passing through the coil foreign object detection 13.
    [041] When power is supplied from the AC power source 300 to the power supply coil 12 through the power control section 11, then the power is supplied from the power supply coil 12 to the coil receiving power 22 through the magnetic coupling between the power supply coil 12 and the power receiving coil 22. At the time of electricity supply, the magnetic flux that passes through the coil plane of the power supply coil 12 and the coil plane of the energy receiving coil 22 also crosses the coil plane of the foreign object detection coil 13. When the foreign object 40 is absent in the foreign object detection coil 13, an induced voltage corresponding to the flow magnetic resulting from the electricity supply is sent as an output voltage from the foreign object detection coil 13 as illustrated in figure 3A. On the other hand, when the foreign object 40 is present in the foreign object detection coil 13, the foreign object 40 behaves like a nucleus, to increase the magnetic flux compared to the magnetic flux resulting from the electricity supply, and therefore way, it raises the induced voltage as shown in figure 3B.
    [042] A voltage limit value for determining whether or not the foreign object 40 is present is determined in the foreign object identification section 1512. The voltage limit value is set higher or equal to the induced voltage that occurs in the coil. foreign object detection 13 when foreign object 40 is absent. The threshold voltage value can be determined depending on the foreign object 40 as a detection target, since the induced voltage that occurs when the foreign object 40 is present is proactively determined during a design stage after the foreign object 40 is identified as a detection target proactively.
    [043] Foreign object identification section 1512 determines that foreign object 40 is present, in response to a condition in which the perceived voltage obtained by the voltage perception section 1511 is higher than a voltage threshold value, and determines that foreign object 40 is absent in response to a condition in which the perceived voltage obtained by the voltage perception section 1511 is lower than the voltage threshold value.
    [044] The following describes the specific configuration of the power supply unit 101 with reference to figures 4 to 8. Figure 4 is a plan view of the power supply unit 101. Figure 5 is a cross-sectional view taken along the line VV of figure 4.Figure 6 is a cross-sectional view taken along the line VIVI of figure 4.Figure 7 is a plan view of the power supply unit 101 where the foreign object detection coil 13 is partially omitted. Figure 8 is a plan view of the power supply unit 101 under a condition that the foreign object detection coil 13 is partially omitted. In figures 4, 7 and 8, the protection element 101c is omitted.
    [045] The power supply unit 101 includes the power supply coil 12, the foreign object detection coil 13, a ferrite core 101a, a magnetic protection plate 101b, and a protective element 101c. The power supply coil 12 consists of a Litz wire through which the high frequency energy passes, and is arranged so that the coil plane of the power supply coil 12 is parallel to the ground. When the vehicle 200 is parked in the specified parking space, the energy receiving coil 22 is in a position facing the energy supply coil 12, so that the energy supply coil 12 and the energy receiving coil 22 are facing each other. In other words, the upper surface of the energy supply coil 12 is a surface facing the energy receiving coil 22, while the lower surface of the energy receiving coil 22 is a surface facing the energy supply coil. energy 12.
    [046] The ferrite core 101a is composed of a plurality of magnetic elements each of which has a rectangular parallelepiped shape. The ferrite core 101a is arranged on the bottom surface of the power supply coil 12. Each magnetic element is arranged to extend further from a central point of the power supply coil 12 in a direction perpendicular to the central geometric axis of the coil power supply 12. The magnetic protection plate 101b is provided to be parallel to the soil surface, and is positioned on the subsurface side of the ferrite core 101a, and serves as a bottom surface for the power supply unit 101. A Magnetic protection plate 101b is an element for protecting a magnetic flux that leaks from the non-contact electricity supply between the power supply coil 12 and the power receiving coil 22, and preventing the magnetic flow from leaking out. The magnetic protection plate 101b is made of an aluminum plate or similar.
    [047] The protection element 101c is an enclosure for the closure of the power supply coil 12, ferrite core 101a, and foreign object detection coil 13, and is formed from a flat top plate and a wall lateral that extends from the edges of the upper plate in a direction perpendicular to the upper plate. The protective element 101c is made of a thermoplastic resin such as polypropylene or polyamide.
    [048] The foreign object detection coil 13 is provided on a surface of the power supply coil 12 which faces the power receiving coil 22 and is disposed between the surface of the power supply coil 12 and the element protection 101c. The foreign object detection coil 13 is composed of a plurality of coils, each of which is formed to have a sector shape that extends radially from the center point of the power supply coil 12 on the coil plane.
    [049] The foreign object detection coil 13 is formed by bending a coil wire in a plane parallel to the coil plane of the power supply coil 12. As illustrated in figure 7, first, the coil wire is placed to extend from a central point (indicated by O in figure 7), which corresponds to the central point of the power supply coil 12, in the direction of the periphery of the power supply coil 12 (as indicated by an arrow “a ”In figure 7). Then, the coil wire is bent at the periphery of the power supply coil 12, to extend along a part of the periphery of the power supply coil 12 in a clockwise direction (as indicated by an arrow “b” in figure 7 ). Then, the coil wire is bent in the direction of the center point O, to extend from the periphery of the power supply coil 12 to the center point O (as indicated by an arrow “c” in figure 7). This process forms the first coil having a sector shape. Then, the same coil wire is placed to extend from the central point O towards the periphery of the power supply coil 12 (as indicated by an arrow “d” in figure 7). The coil wire is then bent at the periphery of the power supply coil 12, to extend along a part of the periphery of the power supply coil 12 in a clockwise direction (as indicated by an arrow “e” in figure 7 ). Then, the coil wire is bent in the direction of the center point O, to extend from the periphery of the power supply coil 12 to the center point O (as indicated by an arrow “f” in figure 7). This process forms the second coil having a sector shape. The first and second coils have the same coil area, where a space is defined between the first coil and the second coil, a space that has the same sector shape as the first coil. Similarly, in the clockwise direction, the third or more coils are formed, and the coil wire is placed to extend from the periphery of the power supply coil 12 to the central point O, thus forming the eighth coil . This process forms half of the plurality of coils in the foreign object detection coil 13.
    [050] The remaining half of the bobbins are formed by using the same bobbin thread illustrated in figure 7, as illustrated in figure 8. That is, the bobbin thread is placed to extend from the central point towards the periphery of the power supply coil 12 (as indicated by an arrow “a” in figure 8). The coil wire is then bent at the periphery of the power supply coil 12, to extend along a part of the periphery of the power supply coil 12 in a counterclockwise direction (as indicated by an arrow “b” in the figure 8). Then, the coil wire is bent in the direction of the center point O, to extend from the periphery of the power supply coil 12 to the center point O (as indicated by an arrow “c” in figure 8). This process forms the first coil having a sector shape. Then, the same coil wire is placed to extend from the central point O towards the periphery of the power supply coil 12 (as indicated by an arrow “d” in figure 8). The coil wire is then bent at the periphery of the power supply coil 12, to extend along a part of the periphery of the power supply coil 12 in a counterclockwise direction (as indicated by an arrow “e” in the figure 8). Then, the coil wire is bent in the direction of the center point O, to extend from the periphery of the power supply coil 12 to the center point O (as indicated by an arrow “f” in figure 8). This process forms the second coil having a sector shape. The first coil and the second coil have the same coil area, where one of the plurality of coils illustrated in figure 7 is arranged between the first coil and the second coil.
    [051] Thus, the foreign object detection coil 13 is composed of a plurality of coils that are connected to each other by a single coil wire, where each coil has the same coil area. The coil plane of the power supply coil 12 is covered by coil planes of the plurality of coils constituting the foreign object detection coil 13.
    [052] The first and second ends of the foreign object detection coil 13 are connected to the terminals (not shown), and are connected through the terminals to a circuit panel (not shown) on the power supply unit 101.
    [053] The following describes a control carried out by control section 15 and loading control section 25.
    [054] Control section 15 performs a system check as a boot control, determining whether or not the electricity supply device 100 systems operate normally. Similarly, loading control section 25 performs a system check as an initialization control, determining whether or not a vehicle loading system 200 operates normally. When the result of the system check indicates that a system anomaly is present in the vehicle 200, the control section 15 informs the user. When the result of the system check indicates that a system anomaly is present in the electricity supply device 100, the control section 15 notifies a center or similar that is managing the electricity supply device 100. On the other hand, when the system verification is normal, control section 15 starts wireless communication section 14, and thus establishes a condition in which a signal can be received. For example, the system check for the electricity supply device 100 is performed at intervals of a specified period, while the system check for vehicle 200 is performed when a main switch is turned on where the main switch serves to drive the vehicle 200.
    [055] Control section 15 and charging control section 25 control wireless communication section 14 and wireless communication section 24, respectively, through the following remote communication control. First, the loading control section 25 obtains information about the present position of the vehicle 200 by a GPS function provided on the vehicle 200, and determines whether or not the present position of the vehicle 200 is within a predetermined loading point. The charging point is determined individually for the electricity supply device 100, and is, for example, a region that is displayed on a map as a circle having a center at the position of the electricity supply device 100. The condition in which vehicle 200 is within the charge point means that battery charging 28 will be implemented by the electricity supply device 100 corresponding to the charge point.
    [056] When the present position of the vehicle 200 is within the charge point, the charge control section 25 initiates wireless communication section 24, and thus allows communication between wireless communication section 14 and the wireless communication section 24. When communication is allowed between the wireless communication section 14 and the wireless communication section 24, then the charging control section 25 sends from the wireless communication section 24 to the wireless communication section 14 a signal for establishing a data link. Then, the control section 15 sends back from the wireless communication section 14 to the wireless communication section 24 a signal that indicates that the control section 15 received the signal. This process establishes the data link between the wireless communication section 14 and the wireless communication section 24.
    [057] In addition, the charging control section 25 sends a vehicle ID 200 to the control section 15 through communication between wireless communication section 14 and wireless communication section 24. Control section 15 performs ID authentication by determining whether or not the ID sent from vehicle 200 matches one of the registered IDs. In this non-contact electricity supply system, chargeable vehicles 200 are proactively registered by ID on each electricity supply device 100. Accordingly, vehicle 200 can be supplied with electricity when ID authentication indicates that the ID of the vehicle 200 matches a registered ID.
    [058] When vehicle 200 is parked in the specified parking space, the energy receiving coil 22 is positioned in the position facing the power supply coil 12. When the user performs an operation to charge the battery 28, then the charge control section 25 sends from the wireless communication section 24 to the electricity supply device 100 a signal indicating a start of the electricity supply. When the control section 15 receives the signal from the wireless communication section 14, then the control section 15 controls the power control section 11, to start supplying electricity from the power supply coil 12 to the energy receiving coil 22.
    [059] Control section 15 performs a test electricity supply prior to a normal electricity supply to charge the battery 28. The energy for sending electricity in the test electricity supply is less than that in the normal electricity supply . The foreign object detection section 151 senses the output voltage of the foreign object detection coil 13 through the voltage sensor section 1511 and compares the perceived voltage with the threshold voltage value to determine whether or not a foreign object is present by foreign object identification section 1512. When the presence of a foreign object is detected during the supply of test electricity, the control section 14 sends from the wireless communication section 14 to the vehicle 200 a signal indicating the detection of the presence of the foreign object, without performing the normal electricity supply. In response to the signal, the loading control section 25 controls the notification section 32 to create a notification that a foreign object is present between the coils. This process allows the detection of the presence of a foreign object before the normal electricity supply, and suppresses the heating of the foreign object.
    [060] On the other hand, when the presence of no foreign objects is detected during the supply of test electricity, the control section 15 controls the power control section 11 to carry out the normal electricity supply. The charge control section 25 charges battery 28 by supplying battery 28 with an energy received on the energy receiving coil 22 during normal electricity supply.
    [061] The foreign object detection section 151 perceives the output voltage of the foreign object detection coil 13 by the voltage perception section 1511 and determines by the foreign object identification section 1512 whether or not a foreign object is present, also during normal electricity supply. When the presence of a foreign object is detected during normal electricity supply, the control section 15 suspends normal electricity, and sends a signal to the vehicle 200 indicating that the foreign object is present. In response to the signal, the charge control section 25 suspends battery charging 28 and controls notification section 32 to create a notification that a foreign object is trapped. This process allows the detection of the presence of a foreign object also during the supply of normal electricity, and suppresses the heating of the foreign object.
    [062] As described above, in the present embodiment, the foreign object detection coil 13 is provided on the surface of the power supply coil 12 facing the energy receiving coil 22, and the foreign object detection section 151 detects a foreign object between the power supply coil 12 and the foreign object detection coil 13, based on the induced voltage occurring in the foreign object detection coil 13. When the foreign object is small, it is difficult to detect the foreign object based on electricity supply efficiency since the amount of change in electricity supply efficiency is small. However, since foreign object detection is based on the voltage induced in this modality, it is possible to detect the foreign object even when the foreign object is small, and it is possible to improve the accuracy of detection compared to foreign object detection. based on electricity supply efficiency.
    [063] In the present embodiment, the foreign object detection coil 13 is composed of a plurality of coils. This makes the ratio of the foreign object in the coil area of each one of the plurality of coils to be relatively large, and the change in voltage induced with respect to the change in magnetic flux is relatively large, and thus allows for improvement foreign object detection accuracy.
    [064] In addition, the coil plane of the power supply coil 12 is divided by the plurality of coils of the foreign object detection coil 13. This results in segmentation of the region corresponding to the power supply coil plane 12 ( region where the supply of electricity can be prevented by the presence of a foreign object) in unit areas for the detection of a foreign object, and thus the change in voltage induced in relation to the change in magnetic flux, and thus allows improving the accuracy of foreign object detection.
    [065] In addition, the foreign object detection coil 13 is connected by a single coil wire. Accordingly, it is sufficient if you supply only one input and output terminal connected to the foreign object detection coil 13.
    [066] In this embodiment, the foreign object detection coil 13 is composed of a plurality of coils, each of which has a sector shape. However, it is unnecessary to use the sector format, but it is optional to use a circular coil parallel to the coil plane of the power supply coil 12, as shown in figure 9. Figure 9 is a plan view of electricity supply 100 from a contactless electricity supply device according to a modification.
    [067] Furthermore, it is unnecessary for the foreign object detection coil 13 to cover the coil plane of the power supply coil 12, but it is sufficient that at least a part of the coil plane of the power supply coil 12 overlap to a part of the foreign object detection coil 13. It is unnecessary for the foreign object detection coil to be provided on the surface of the power supply coil 12 facing the energy receiving coil 22, but the object detection coil alien 13 can be provided on the surface of the energy receiving coil 22 facing the energy supply coil 12, or it can be supplied on vehicle 200. Although the foreign object detection section 151 is provided in control section 15, the foreign object detection section 151 can be provided in the loading control section 25.
    [068] One of the power supply coil 12 and the power receiving coil 22 corresponds to a first coil of the present invention, and the other coil corresponds to a second coil of the present invention, and the foreign object detection coil 13 corresponds to a third coil of the present invention, and the foreign object detection section 151 corresponds to a foreign object detection means of the present invention. Second Mode
    [069] The following describes a non-contact electricity supply device according to another embodiment of the present invention with reference to figure 10. This embodiment differs from the first embodiment described above since the foreign object detection coil 13 is composed of a plurality of independent coils. With respect to the same part of the remaining configuration as in the first modality, the description for the first modality is applied as appropriate. Figure 10 is a plan view of the power supply unit 101 included in the non-contact electricity supply device of this embodiment. In figure 10, the protection element 101c is omitted.
    [070] The foreign object detection coil 13 is composed of a semicircular coil 13a and a semicircular coil 13b in the coil plane of the power supply coil 12. Coil 13a and coil 13b are configured to be independent of each other , and have the same coil area. The input / output terminals (not shown) connected to the ends of the coil 13a, and the input and output terminals (not shown) connected to the ends of the coil 13b, are provided independently of each other, so that coil 13a and a coil 13b are individually connected to the foreign object detection section 151. Accordingly, the voltage perception section 1511 perceives individually the output voltage of coil 13a and the output voltage of coil 13b.
    [071] When a foreign object is present in the foreign object detection coil 13a, the non-contact electricity supply causes the induced voltage in coil 13a to exceed a threshold voltage value for determination, and causes the induced voltage of the coil 12b is less than the limit voltage value. When a foreign object is present on the foreign object detection coil 13b, the non-contact electricity supply causes the induced voltage of coil 13b to exceed the threshold voltage value, and causes the induced voltage of coil 13a to become lower. than the limit voltage value.
    [072] Foreign object identification section 1512 compares the output voltage of coil 13a and the output voltage of coil 13b with the threshold voltage value, and determines that a foreign object is present in the coil plane of one of the coils 13a and 13b that are sending an output voltage greater than the threshold voltage value.
    [073] In this modality, the characteristic of the independent coil 13a and 13b, that is, coil 13a and coil 13b whose input and output terminals are independent of each other, are supplied in the power supply coil 12, serves to dividing the coil plane of the power supply coil 12 into a plurality of regions, and causes an induced voltage corresponding to each region, and allows the detection of the location of the foreign object, that is, the detection of which region of the foreign object is gift.
    [074] Although coil 13a and coil 13b are formed to have a semicircular shape in this modality, it is unnecessary to use the semicircular shape, but another shape can be used. Third Mode
    [075] The following describes a non-contact electricity supply device according to another embodiment of the present invention with reference to figures 11 to 13.
    [076] This mode differs from the first mode described above in that the foreign object detection coil 13 is composed of a plurality of independent coils. With respect to the same part of the remaining configuration as in the first modality, the description of the first modality is applied as appropriate. Figure 11 is a plan view of the power supply unit 101 included in the non-contact electricity supply device of this embodiment. In figure 11, the protection element 101c is omitted.
    [077] The foreign object detection coil 13 is formed by bending a coil wire in a plane parallel to the coil plane of the power supply coil 12. As illustrated in figure 11, the foreign object detection coil 13 consists of: placing a coil wire to extend along the diameter of the power supply coil 12 from a part (point S in figure 11) of the periphery of the coil plane of the power supply coil 12, passing on the left side of the central point O (as indicated by an arrow “a” in figure 11); bending the coil wire on the periphery of the power supply coil 12 and placing the coil wire to extend along a semicircle on the periphery of the power supply coil in a counterclockwise direction (as indicated by an arrow “b ”In figure 11); folding the coil wire in a part (point S in figure 11) of the periphery of the coil plane, and placing the coil wire to extend along the diameter of the power supply coil 12, passing on the right side of the center point O (as indicated by an arrow “c” in figure 11); bending the coil wire on the periphery of the power supply coil 12, and placing the coil wire to extend along a semicircle of the periphery of the power supply coil in the counterclockwise direction (as indicated by the arrow “b ”In figure 11); folding the coil wire in a part (point S in figure 11) of the periphery of the coil plane and placing the coil wire to extend along the diameter of the power supply coil 12, passing on the right side of the center point O (as indicated by an arrow “c” in figure 11); bending the coil wire on the periphery of the power supply coil 12, and placing the coil wire to extend along a semicircle on the periphery of the power supply coil 12 in a clockwise direction (as indicated by an arrow “d” in figure 11); and bending the coil wire out of the periphery of the power supply coil 12 into a part (point S in figure 11) of the periphery of the coil plane.
    [078] That is, the foreign object detection coil 13 is formed of a single coil wire, including a left side coil 13c and a right side coil 13d adjacent to each other and having the same shape. The left side coil 13c and the right side coil 13d are in a twisted relationship to each other, and have the same coil area.
    [079] The following describes an induced current flowing through the left side coil 13c and an induced current flowing through the right side coil 13d, and an induced voltage from the foreign object detection coil 13, with reference to figures 12 and 13. Figure 12 is a diagram to illustrate the effects of the foreign object detection coil 13 of this modality. Figure 13 is a graph illustrating the characteristics of the induced voltage with respect to time.
    [080] When the contactless electricity supply is carried out on condition that no foreign objects are present in the left side coil coil plane 13c and the right side coil coil plane 13d, a magnetic flux occurs passing through the plane of coil coil of the left side coil 13c and the coil plane of the right side coil 13d in the same direction as illustrated in figure 12. Then, an induced voltage occurs in the left side coil 13c and in the right side coil 13d as if it resisted the magnetic flux. Under this condition, the induced current flowing through the left side coil 13c is clockwise, while the induced current flowing through the right side coil 13d is counterclockwise, since the left side coil 13c and the right side coil 13d are in a twisted relationship.
    [081] Since the coil area of the left side coil 13c is the same as that of the right side coil 13d, the induced current flowing through the left side coil 13c and the induced current flowing through the right side coil 13d are in opposite directions one to another so that they cancel each other out, and the current becomes zero, and the output voltage of the foreign object detection coil 13 becomes zero as indicated by (a) in the graph in figure 13.
    [082] On the other hand, when a metallic foreign object is present in one of the coil plane of the left side coil 13c and the coil plane of the right side coil 13d, the magnetic flux flowing through one of the coils where the foreign object it is present becomes more intense so that the induced current flowing through one of the coils where the foreign object is present becomes greater than that passing through one of the coils where no foreign object is present. Since the induced current of the left side coil 13c and the induced current of the right side coil 13d do not cancel each other out to zero, the output voltage of the foreign object detection coil 13 becomes greater than zero as indicated by (b) in graph in figure 13.
    [083] As described above, in this embodiment, the foreign object detection coil 13 is composed of the plurality of coils 13c, 13d where the coils 13c and 13d adjacent to each other are arranged so that when no foreign objects are present, the induced currents flowing through the coils are in opposite directions from each other. Accordingly, the left side coil 13c and the right side coil 13d are in a twisted relationship so that the induced currents flowing through the coils cancel each other out. This makes it possible to easily detect the amount of voltage change induced when a foreign object is present, in relation to the voltage induced when no foreign object is present, thus improving the accuracy of detection.
    [084] In this embodiment, the coil area of the left side coil 13c and the coil area of the right side coil 13d are the same. Accordingly, when no foreign objects are present, the induced currents occurring in the coils cancel each other out to zero, so that the output voltage of the foreign object detection coil 13 becomes equal to zero. When a foreign object is present, the output voltage of the foreign object detection coil 13 does not become equal to zero. Accordingly, for foreign object detection, it is sufficient to perceive the amount of voltage change induced from This improves detection accuracy.
    [085] In this modality, the twisted relationship in the foreign object detection coil 13 can be implemented by forming the foreign object detection coil 13 by a plurality of independent coil pairs, each having a sector shape as illustrated in the figure 4, which are arranged to extend radially from the central point of the power supply coil 12. In this configuration, each pair of coils is formed in a twisted relationship. This causes the plurality of coils of the foreign object detection coil 13 to be in a twisted relationship so that when no foreign object is present, the induced voltage becomes zero. This improves detection accuracy in a similar way to the above configuration.
    [086] Although the twisted relationship is implemented by using two coils in this modality, the number of coils can be different from two, and the foreign object detection coil 13 can be configured so that a twisted relationship is formed between one plurality of coils.
    权利要求:
    Claims (12)
    [0001]
    1. Non-contact electricity supply device, comprising: a second coil (12) adapted to send electricity to a first coil (22) without contact, at least through a magnetic coupling between them; a third spool (13) provided on a first side of the second spool, with the first side facing the first spool; and a foreign object detection means (151) adapted to detect a foreign object between the first coil and the second coil based on a change in an induced voltage, which occurs in the third coil, in which the change in induced voltage results in starting from a magnetic flux change between the first coil (22) and the second coil (12); CHARACTERIZED by the fact that a magnetic element (101a) is provided on a second side of the second coil (12), in which the second side is opposite the first side of the second coil (12); and the magnetic element (101a) is separated from the third coil (13) with a distance between them, wherein the magnetic element (101a) includes a plurality of magnetic elements, each of which has a rectangular parallelepiped shape, in which each magnetic element is arranged to extend radially from a central point of the second coil (12) in a direction perpendicular to a central axis of the second coil (12).
    [0002]
    2. Non-contact electricity supply device according to claim 1, CHARACTERIZED by the fact that the third coil (13) includes a plurality of coils.
    [0003]
    3. Non-contact electricity supply device according to claim 2, CHARACTERIZED by the fact that at least two of the plurality of coils of the third coil (13) adjacent to each other are arranged so that an induced current direction flowing through one of the two coils is opposite to that passing through the other two coils when the foreign object is absent.
    [0004]
    4. Non-contact electricity supply device, according to claim 3, CHARACTERIZED by the fact that the two coils have coil areas equal to each other.
    [0005]
    5. Non-contact electricity supply device, according to claim 2, CHARACTERIZED by the fact that: the third coil (13) is arranged parallel to the surface of the second coil (12) facing the first coil (22); and each of the plurality of coils of the third coil (13) is in the form of a sector, and arranged to extend radially from a central point of the second coil (12).
    [0006]
    6. Non-contact electricity supply device according to claim 2, CHARACTERIZED by the fact that the plurality of coils of the third coil (13) are connected to each other by a single wire.
    [0007]
    7. Non-contact electricity supply device according to claim 1, CHARACTERIZED by the fact that: the foreign object detection means determine whether or not a foreign object is present, by comparing the induced voltage of the third coil (13) with a voltage limit value for determination; and the voltage limit value for determination is determined to be greater than the induced voltage of the third coil (13) when no foreign object is present.
    [0008]
    8. Non-contact electricity supply device, according to claim 2, CHARACTERIZED by the fact that: the plurality of coils of the third coil (13) is independent of each other; and the foreign object detection means to locate a foreign object based on the induced voltages of the individual coils.
    [0009]
    9. Non-contact electricity supply device, according to vindication king 4, CHARACTERIZED by the fact that the foreign object detection means determines that a foreign object is present, in response to a condition in which the induced voltage of the third coil (13) is different from zero.
    [0010]
    10. Non-contact electricity supply device according to claim 1, CHARACTERIZED by the fact that: a test electricity supply is performed prior to a normal electricity supply; and foreign object detection is carried out during the supply of test electricity.
    [0011]
    11. Non-contact electricity supply device according to claim 1, CHARACTERIZED by the fact that the magnetic element (101a) has a substantially flat surface facing the second coil.
    [0012]
    12. Non-contact electricity supply device according to claim 1 or 11, CHARACTERIZED by the fact that the magnetic element (101a) is a ferrite core.
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    同族专利:
    公开号 | 公开日
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    EP2717431B1|2018-03-21|
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    法律状态:
    2018-03-27| B15K| Others concerning applications: alteration of classification|Ipc: H04B 5/00 (2006.01), B60L 11/18 (2006.01), H01F 38 |
    2018-05-15| B15K| Others concerning applications: alteration of classification|Ipc: H02J 7/00 (2006.01), H02J 7/02 (2016.01), H01F 38/ |
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-09-17| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-09-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-12-08| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 23/05/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011-118663|2011-05-27|
    JP2011118663A|JP6067211B2|2011-05-27|2011-05-27|Non-contact power feeding device|
    PCT/JP2012/063144|WO2012165244A1|2011-05-27|2012-05-23|Contactless electricity supply device|
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