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WO2016121055A1 - Structure de bobine de transmission de puissance dans un dispositif de transmission de puissance sans contact - Google Patents

Structure de bobine de transmission de puissance dans un dispositif de transmission de puissance sans contact Download PDF

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Publication number
WO2016121055A1
WO2016121055A1 PCT/JP2015/052541 JP2015052541W WO2016121055A1 WO 2016121055 A1 WO2016121055 A1 WO 2016121055A1 JP 2015052541 W JP2015052541 W JP 2015052541W WO 2016121055 A1 WO2016121055 A1 WO 2016121055A1
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WIPO (PCT)
Prior art keywords
coil
magnetic flux
power transmission
flux density
vehicle
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Ceased
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PCT/JP2015/052541
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English (en)
Japanese (ja)
Inventor
木下　拓哉
研吾 毎川
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Priority to PCT/JP2015/052541 priority Critical patent/WO2016121055A1/fr
Publication of WO2016121055A1 publication Critical patent/WO2016121055A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings

Definitions

  • This invention relates to the structure of the coil for electric power transmission used for a non-contact electric power transmission apparatus.
  • a non-contact power transmission device that transmits power in a non-contact manner and charges the battery provided in the power receiving side device.
  • a non-contact power transmission device when a foreign metal object exists in the vicinity of a power transmission coil for transmitting power or a power reception coil for receiving power, the foreign object may generate heat. Therefore, if there is a foreign object, it must be detected and removed.
  • Patent Document 1 As a conventional example of foreign object detection, for example, one described in Patent Document 1 is known.
  • Patent Document 1 a plurality of signal primary coils smaller than the power transmission primary coil are provided in order to detect whether or not there is a foreign object in the vicinity of the power transmission primary coil, and are generated in each signal primary coil. It is shown that a foreign object existing in the vicinity of a primary coil for power transmission is detected by measuring a voltage.
  • the present invention has been made to solve such a conventional problem.
  • the object of the present invention is to place a foreign object having a shape similar to the main coil of the power transmission coil in the vicinity of the power transmission coil. It is an object of the present invention to provide a coil structure for power transmission that can detect the presence of a foreign substance with high accuracy even when it is used.
  • the coil structure for power transmission of the non-contact power transmission apparatus is configured such that the power transmission coil has a flat plate-shaped magnetic body and a surface on the power transmission side or reception side with respect to the magnetic body. It includes a main coil that is provided and spirally wound. Furthermore, a general part that generates a predetermined magnetic flux density and a magnetic flux changing part that generates a magnetic flux density different from the general part are provided.
  • FIG. 1 is a block diagram showing a configuration of a non-contact charging system that employs a power transmission coil structure of a non-contact power transmission apparatus according to an embodiment of the present invention.
  • this non-contact charging system 100 includes a vehicle-side device 101 mounted on an electric vehicle (hereinafter referred to as “vehicle”) and a power supply device 102 that is installed on the ground side and supplies power to the vehicle. It is configured. And electric power is transmitted from the electric power feeder 102, this electric power is received non-contact in the vehicle side apparatus 101, and the received electric power is charged to the battery mounted in an electric vehicle.
  • vehicle an electric vehicle
  • power supply device 102 that is installed on the ground side and supplies power to the vehicle. It is configured.
  • electric power is transmitted from the electric power feeder 102, this electric power is received non-contact in the vehicle side apparatus 101, and the received electric power is charged to the battery mounted in an electric vehicle.
  • the “non-contact power transmission device” indicates both the vehicle side device 101 and the power feeding device 102. That is, the power feeding device 102 is a non-contact power transmission device that transmits power in a non-contact manner via a power transmission coil (a ground coil 14 described later), and the vehicle-side device 101 includes a power transmission coil (a vehicle described later). This is a non-contact power transmission device that receives power in a non-contact manner via a coil 35).
  • the configuration of the non-contact charging system 100 will be described.
  • a power supply apparatus 102 shown in FIG. 1 desires a DC power source 11 that rectifies AC power output from a commercial power source 10 (for example, 100 V, 50 Hz) to obtain DC power, and DC power output from the DC power source 11.
  • the inverter 12 which converts into the alternating current power of frequency, the ground coil 14 for electric power feeding provided in the road surface of the parking space of a vehicle, and the resonance capacitor 13 which resonates electric power between this ground coil 14 are provided.
  • the voltage / current / temperature sensor 16 that detects the voltage, current, and temperature of the DC power supply 11 and the inverter 12, the ground side control unit 15, and operations for acquiring reference voltage data (described later) used for foreign object determination are performed.
  • reference voltage storage unit 21 that stores a reference voltage table
  • wireless LAN 17 that performs short-range communication with vehicle-side device 101
  • various types of information particularly, information regarding the presence of foreign matter
  • display unit 22 for displaying.
  • a planar search coil 19 provided on the upper surface side (power transmission side) of the ground coil 14 and provided substantially parallel to the ground coil 14, and a voltage detection control unit for measuring a voltage generated in the search coil 19. 20.
  • a disk-type coil is used as the ground coil 14. Details of the disk type coil will be described later.
  • the search coil 19 is configured by a plurality of sensor coils 19 ⁇ / b> L (in the figure, 54 of 9 ⁇ 6 are shown as an example) arranged in a plane. A voltage resulting from the magnetic flux output from the ground coil 14 is generated in each sensor coil 19L.
  • the ground side control unit 15 comprehensively controls the power supply apparatus 102. In particular, various controls including operations of the inverter 12 and the DC power supply 11 are performed. Specifically, when transmitting power to the vehicle-side device 101, the ground-side control unit 15 supplies AC power output from the inverter 12 to the ground coil 14 so that the ground coil 14 is used. Performs excitation control. Further, when it is confirmed by the operator that no foreign matter (nails, bolts, empty cans, etc.) exists around the search coil 19 and the calibration switch 18 is operated, the ground coil 14 is excited.
  • produces in each sensor coil 19L at this time is measured as a reference voltage, and the process which memorize
  • the vehicle-side device 101 includes a vehicle coil 35 provided on the bottom surface of the vehicle, a resonance capacitor 34 that resonates power between the vehicle coil 35, and AC power received via the vehicle coil 35.
  • a vehicle coil 35 provided on the bottom surface of the vehicle
  • a resonance capacitor 34 that resonates power between the vehicle coil 35, and AC power received via the vehicle coil 35.
  • DC power a battery 31 that charges DC power
  • a relay box 32 that switches between charging and discharging of the battery 31.
  • the voltage / current / temperature sensor 38 for detecting the input / output voltage and current of the battery 31 and the temperature of the relay box 32, the vehicle side control unit 39, and the operation for acquiring the reference voltage table used for foreign object determination are performed.
  • a calibration switch 44 to be performed, a reference voltage storage unit 43 that stores a reference voltage table, a wireless LAN 41 that performs near field communication with the power supply apparatus 102, and various types of information (particularly, information related to the presence of foreign matter) are displayed. Display unit 42.
  • vehicle-side control unit 39 is connected to the vehicle network 40, and can transmit and receive data to and from in-vehicle devices such as an ECU in the vehicle.
  • a planar search coil 36 provided so as to cover the lower surface side (electric power reception side) of the vehicle coil 35 and provided substantially parallel to the vehicle coil 35, and a voltage generated in the search coil 36 are measured.
  • a voltage detection control unit 37 a planar search coil 36 provided so as to cover the lower surface side (electric power reception side) of the vehicle coil 35 and provided substantially parallel to the vehicle coil 35, and a voltage generated in the search coil 36 are measured.
  • a voltage detection control unit 37 is provided so as to cover the lower surface side (electric power reception side) of the vehicle coil 35 and provided substantially parallel to the vehicle coil 35.
  • the disk coil 35 is used for the vehicle coil 35 as in the case of the ground coil 14 described above.
  • the search coil 36 has a configuration in which a plurality of sensor coils are arranged in a plane, similarly to the search coil 19 (see FIG. 2) on the power supply apparatus 102 side described above.
  • the voltage detection control unit 37 measures the voltage generated in the search coil 36. More specifically, the voltage generated in each sensor coil provided in the search coil 36 is individually detected, and each detected voltage data is transmitted to the vehicle side control unit 39.
  • the vehicle-side control unit 39 controls the vehicle-side device 101 as a whole. In particular, after confirming that no foreign matter is present around the search coil 36, the vehicle coil 35 is excited, the voltage generated at each sensor coil is measured, and this voltage is used as a reference voltage table. Store in the voltage storage unit 43. Further, based on the detection signal from the voltage detection control unit 37, it is determined whether or not there is a foreign object in the vicinity of the search coil 36. Further, when it is determined that a foreign object is present, the position where the foreign object is present and the material of the foreign object are determined to notify the operator of the power supply apparatus 102 or the driver of the vehicle, or to output an alarm. Then, control for forcibly cutting off charging of the battery 31 is performed.
  • the vehicle-side control unit 39 and the above-described ground-side control unit 15 can be configured as, for example, an integrated computer including a central processing unit (CPU) and storage means such as a RAM, a ROM, and a hard disk. .
  • CPU central processing unit
  • storage means such as a RAM, a ROM, and a hard disk.
  • FIG. 3 is a side view schematically showing a state when the ground coil 14 and the vehicle coil 35 face each other.
  • the search coil 19 is provided so as to cover the upper surface side of the ground coil 14 provided on the road surface of the parking space, and the lower surface side of the vehicle coil 35 provided on the vehicle bottom surface is covered.
  • a search coil 36 is provided.
  • FIG. 4 is a block diagram showing a detailed configuration of the voltage detection control unit 20.
  • the voltage detection control unit 20 is connected to each sensor coil 19L (in FIG. 4, each sensor coil 19L is represented as channel 1, channel 2,... Channel n), and each sensor coil A multiplexer 51 that sequentially switches and outputs a voltage signal detected by 19L, a differential amplifier 52 that amplifies the voltage signal output from the multiplexer 51, and a rectifier for the voltage signal output from the differential amplifier 52 A rectifier 53 for removing the AC component, and a CPU 55 for A / D converting the voltage signal.
  • each sensor coil 19L in FIG. 4, each sensor coil 19L is represented as channel 1, channel 2,... Channel n
  • each sensor coil A multiplexer 51 that sequentially switches and outputs a voltage signal detected by 19L, a differential amplifier 52 that amplifies the voltage signal output from the multiplexer 51, and a rectifier for the voltage signal output from the differential amplifier 52 A rectifier 53 for removing the AC component, and a CPU 55 for A /
  • the CPU 55 has a function of transmitting a channel designation signal to the multiplexer 51. Accordingly, the voltage signal detected by each sensor coil 19L is input to the CPU 55 as a serial signal, digitized by the CPU 55, and transmitted to the ground side control unit 15 shown in FIG. Note that the voltage detection control unit 37 provided in the vehicle-side device 101 also has the same configuration as in FIG.
  • FIGS. 5A and 5B are explanatory views showing the configuration of the disk-type coil 71, where FIG. 5A is a plan view and FIG. 5B is a cross-sectional view taken along line A-A 'in FIG.
  • the disk-shaped coil 71 is provided with an insulating material 73 so as to cover the upper surface of a ferrite 72 (magnetic material) having a flat plate shape.
  • the electric wire is rectangular on the upper surface of the insulating material 73.
  • a main coil 74 wound in a spiral shape is provided.
  • terminals 75a and 75b are provided at the outer peripheral end and the inner peripheral end of the main coil 74, respectively.
  • the terminals 75a and 75b are connected to the inverter 12 via the resonance capacitor 13 shown in FIG. 1, and an alternating current is passed through the main coil 74, whereby a magnetic flux can be generated around the disk-type coil 71. Since this magnetic flux is transmitted to the vehicle coil 35 side, electric power can be transmitted to the vehicle coil 35.
  • FIG. 6 is an explanatory diagram schematically showing magnetic flux generated in the disk-type coil 71 when an alternating current is passed through the main coil 74.
  • FIG. 6 shows a cross section of the disk-type coil 71, and a magnetic flux is generated around the main coil 74 in which an electric wire is wound in a spiral shape as indicated by an arrow in the figure. That is, the magnetic flux density increases on the inner side (center side) and the outer side (outer peripheral side) of the main coil 74, and the magnetic flux density decreases in the region therebetween.
  • a voltage generated in each sensor coil 19L when no foreign matter is present around the disk type coil 71 is detected in advance, and this voltage is stored as a reference voltage in the reference voltage storage unit 21 (see FIG. 1). .
  • the voltage detected by each sensor coil 19L is compared with the reference voltage.
  • the voltage detected by each sensor coil 19L changes with respect to the reference voltage. Therefore, the presence of foreign objects is detected based on this change. can do.
  • the voltage detected by each sensor coil 19L the reference voltage
  • the voltage detected by each sensor coil 19L is uniformly reduced or raised, so the presence of the foreign matter may not be detected.
  • the voltage generated in each sensor coil 19L is uniformly reduced or increased, the change in voltage is due to the difference in gap between the ground coil 14 and the vehicle coil 35, or there is a frame-like foreign matter. This is because it is impossible to tell whether it is due to a problem.
  • the magnetic flux density is changed by forming a notch in a part of the ferrite 72 (magnetic material) constituting the disk-type coil 71, and a frame-like foreign material is formed on the upper surface side of the disk-type coil 71. Even if exists, this is reliably detected.
  • specific examples of the first embodiment will be described in the first example and the second example.
  • FIG. 7 is an explanatory diagram schematically showing the configuration of the disk-type coil 71 (power transmission coil) and its peripheral devices according to the first embodiment.
  • 7A is a plan view
  • FIG. 7B is an explanatory diagram showing magnetic flux density generated when a current is passed through the main coil 74
  • FIG. 7C is an AA ′ cross-sectional view shown in FIG.
  • FIG. 4 shows a cross-sectional view along the line BB ′ shown in FIG.
  • the disk type coil 71 is shown by taking the ground coil 14 shown in FIG. 1 as an example.
  • the disk-type coil 71 includes a rectangular ferrite 72, an insulating material 73 provided on the upper surface side of the ferrite 72, and an electric wire on the upper surface side of the insulating material 73.
  • the main coil 74 wound in the shape is provided. Further, as shown in FIGS. 7A and 7D, a notch p1 is formed from the center of the ferrite 72 downward. Then, the end portion of the electric wire on the inner peripheral side of the main coil 74 is drawn out to the outside and connected to the terminal 75b via the space formed by the cutout portion p1. That is, by inserting the electric wire at the end of the main coil 74 into the notch p1 formed in the ferrite 72 (magnetic material), the electric wire at the end of the main coil 74 is drawn out of the main coil 74. .
  • the ferrite 72, the insulating material 73, and the main coil 74 constituting the disk-type coil 71 are housed in a metal case 82, and the metal case
  • the search coil 19 shown in FIGS. 1 and 2 is provided at the top end of 82, and the upper surface thereof is closed by a resin lid 81.
  • the magnetic flux density B1 of the region R1 around which the main coil 74 is wound As shown in FIG. 7B, the magnetic flux density B1 of the region R1 around which the main coil 74 is wound, the magnetic flux density B2 of the region R2 inside the region R1, and the region R1
  • the relationship (B2, B3)> B1 is established between the magnetic flux density B3 in the outer region R3. That is, the magnetic flux densities B2 and B3 in the regions R2 and R3 are larger than the magnetic flux density B1 in the region R1.
  • the magnetic flux densities B4 and B5 in the inner and outer regions of the main coil 74 corresponding to this, that is, the regions R4 and R5 shown in FIG. The magnetic flux densities B2 and B3 in the regions R2 and R3 are small. That is, the relationship (B2, B3)> (B4, B5)> B1 is established.
  • the regions R2 and R3 are general portions that are regions that generate a predetermined magnetic flux density
  • the regions R4 and R5 are magnetic flux changing portions that are regions that generate a magnetic flux density different from the general portion.
  • the magnetic flux density generated when a current is passed through the disk-type coil 71 is smaller than the other regions (general portion).
  • the regions R2, R3 and the region are caused by the presence of the foreign material.
  • the magnitude of the magnetic flux density and the ratio of the magnetic flux density of R4 and R5 change. Therefore, it is possible to detect whether or not a frame-like foreign substance exists by detecting the change in the magnitude and ratio of the magnetic flux density.
  • FIG. 8 is a characteristic diagram showing an example of a reference voltage table set for each output power.
  • a curve s1 indicates the reference voltage detected by each sensor coil 19L when the output power of the ground coil 14 is 1 KW.
  • the horizontal axis in FIG. 8 indicates “channels” (numbers of the sensor coils 19L) in the order of decreasing generated voltage toward the right. That is, the left end of the curve s1 indicates the channel with the lowest generated voltage, and the right end indicates the channel with the highest generated voltage.
  • the curve s2 indicates the reference voltage when the output power is 2 KW
  • the curve s3 indicates the reference voltage when the output power is 3 KW.
  • the difference between the voltage generated in each sensor coil 19L detected by the voltage detection control unit 20 and the reference voltage table is calculated.
  • the difference between the measured voltage data (curve s12) and the reference voltage (curve s11) stored in the reference voltage table is obtained. Detect presence.
  • the ground side control unit 15 compares the voltage detected by each sensor coil 19L with the above reference voltage, and if there is a large difference, the vicinity of the search coil 19 and thus the ground coil 14 It is determined that a metal foreign object exists in the vicinity.
  • the presence of a foreign object can be detected by the same method as described above for the search coil 36 provided on the lower surface side of the vehicle coil 35 shown in FIG. Detailed description is omitted.
  • the search coil 36 it is possible to detect a foreign object in the vicinity of the vehicle coil 35 due to a metal foreign object entangled with the vehicle coil 35 or the like.
  • FIG. 10A shows a case in which a rod-like foreign matter (for example, iron) having a high magnetic permeability is placed at substantially the center of the search coil 19, and FIG. 10B is slightly shifted from the center of the search coil 19. It is a top view which shows a voltage change when the foreign material (for example, iron) with the block shape and the high magnetic permeability is put in the position.
  • a rod-like foreign matter for example, iron
  • FIG. 11A shows a case where a rod-like foreign material (for example, aluminum) having a low magnetic permeability is placed at the substantially central portion of the search coil 19, and FIG. 11B is slightly shifted from the center of the search coil 19. It is a top view which shows a voltage change when the block-shaped foreign material with low magnetic permeability is put in the position.
  • a rod-like foreign material for example, aluminum
  • FIG. 12A and 12B are explanatory views showing a state in which a frame-like foreign material 83 is placed on the upper surface side of the disk-type coil 71.
  • FIG. 12A is a plan view
  • FIG. 12B is a cross-sectional view taken along line AA ′ in FIG. (C) is a BB ′ cross-sectional view in (a).
  • the foreign matter 83 overlaps with the main coil 74 as shown in FIG.
  • the magnetic flux density generated by the disk type coil 71 is uniformly reduced, and does not appear as a local voltage change as shown in the characteristic diagram of FIG.
  • the presence of a frame-like foreign object is detected based on a change in the magnetic flux density ratio.
  • the inter-coil gap which is the distance between the ground coil 14 and the vehicle coil 35 shown in FIG. 1, differs depending on the vehicle. Therefore, the current flowing through the ground coil 14 is changed according to the gap between the coils.
  • the current flowing through the main coil 74 is defined as current I.
  • the magnetic flux densities B2 and B3 in the regions R2 and R3 are “b * I” as indicated by the symbol q2.
  • the magnetic flux densities B4 and B5 of the regions R4 and R5 are “a * I” as indicated by the symbol q1.
  • the current flowing through the main coil 74 is defined as current 2I.
  • the magnetic flux density in the regions R2 and R3 is “a * 2I” as indicated by the symbol q4
  • the magnetic flux density in the regions R4 and R5 is “b * 2I” as indicated by the symbol q3. That is, when there is no foreign matter on the upper surface side of the disk-type coil 71, when the gap between the coils changes, the ratio of the magnetic flux density between the regions R2, R3 and the regions R4, R5 is “2: 1. This ratio does not change greatly even if the gap between the coils changes.
  • the magnetic flux density of the regions R2 and R3 is “b * 2Ic” as indicated by the symbol q6, and the magnetic flux density of the regions R4 and R5 is “a * 2Ic” as indicated by the symbol q5. . Therefore, the ratio of magnetic flux density is “3: 1”, and the ratio changes.
  • the notch p1 for inserting the electric wire of the main coil 74 is formed in the central portion of the ferrite 72 included in the disk type coil 71, and the regions R4 and R5 (magnetic flux changing portions) are formed. ) Is a region having a smaller magnetic flux density than the other regions R2 and R4 (general part). Therefore, even when a frame-shaped foreign object is placed on the upper surface side of the disk-type coil 71 (power transmission coil), the presence of the foreign object can be detected with high accuracy.
  • the operation when detecting the presence of a foreign object in the non-contact charging system 100 employing the power transmission coil structure according to the first embodiment will be described with reference to the flowcharts shown in FIGS.
  • voltage data detected by each sensor coil 19L when no foreign object is present in the vicinity of the search coil 19 is acquired in advance, and this is stored as a reference voltage table.
  • the data is stored in the unit 21 (see FIG. 1). Further, the ratio of the magnetic flux density generated in the regions R2 and R3 and the magnetic flux density generated in the regions R4 and R5 is calculated, and this ratio is stored and stored in the reference voltage storage unit 21.
  • step S31 the ground-side control unit 15 shown in FIG. 1 supplies power to the ground coil 14 so that the output becomes 1 KW.
  • step S32 the voltage distribution in each sensor coil 19L of the search coil 19 at this time is acquired and stored in the reference voltage storage unit 21 as a reference voltage table at 1 kW.
  • step S33 the ground-side control unit 15 supplies power to the ground coil 14 so that the output becomes 2 KW.
  • step S34 the voltage distribution in each sensor coil 19L of the search coil 19 at this time is acquired and stored in the reference voltage storage unit 21 as a reference voltage table at 2 kW.
  • step S35 the ground side control part 15 supplies electric power to the ground coil 14 so that an output may be 3KW.
  • step S36 the voltage distribution in each sensor coil 19L of the search coil 19 at this time is acquired and stored in the reference voltage storage unit 21 as a reference voltage table at 3 kW.
  • step S37 the magnetic flux densities of the regions R2, R3 (general part) and the regions R4, R5 (magnetic flux changing part) are calculated from the current I during operation at each output.
  • step S37 the magnetic flux density ratio in each region is calculated, and the calculation result is stored and saved in the reference voltage storage unit 21.
  • a reference voltage table indicating the voltage distribution of the search coil 19 at each output.
  • the ratio of the magnetic flux density of a general part and the magnetic flux density of a magnetic flux change part is computable.
  • the ground coil 14 is excited and the reference voltage table for the search coil 19 provided on the upper surface side of the ground coil 14 and the magnetic flux density ratio are obtained.
  • a reference voltage table for each output power can be created by similar processing.
  • the ground side control unit 15 determines whether or not to perform a reference voltage table calibration process in step S52. This process can be determined by whether or not the operator has pressed the calibration switch 18. When the calibration switch 18 is pressed (ON in step S52), in step S53, the ground side control unit 15 executes the process shown in FIG. 14 and creates a new reference voltage table. .
  • step S52 when the calibration switch 18 is not pressed (OFF in step S52), voltage data detected by each sensor coil 19L included in the search coil 19 is acquired in step S54. That is, voltage data for each sensor coil 19L detected by the voltage detection control unit 20 shown in FIG. 1 is acquired.
  • step S55 the ground side control unit 15 reads the reference voltage table stored and saved in advance in the reference voltage storage unit 21. At this time, a reference voltage table corresponding to the output power of the ground coil 14 is used. For example, when the output power of the ground coil 14 is 2 KW, the reference voltage table corresponding to 2 KW is read.
  • step S56 the ground side control unit 15 compares the reference voltage table read in step S55 with the voltage data acquired in step S54 to obtain a differential voltage.
  • step S57 the ground-side control unit 15 determines a voltage change pattern in an area where the differential voltage is equal to or higher than a preset threshold voltage (an installation position of the sensor coil 19L). Based on the voltage change pattern, the position on the search coil 19 where the foreign substance exists is specified. Further, it is determined whether the foreign material is a foreign matter having a high magnetic permeability such as iron or a foreign matter having a low magnetic permeability such as copper or aluminum. Specifically, the position and material of the foreign matter are specified based on the method shown in FIGS.
  • step S58 the ratio of the magnetic flux density B2 in the region R2 (or the magnetic flux density B3 in the region R3) and the magnetic flux density B4 in the region R4 (or the magnetic flux density B5 in the region R5) shown in FIG. 7 is calculated.
  • step S59 the ratio calculated in step S58 is compared with the magnetic flux density ratio calculated in step S38 of FIG. If there is a large difference in the ratio, it is detected that there is a frame-like foreign object in the vicinity of the disk type coil 71.
  • the foreign object detection information can be notified to the vehicle side device 101 by communication between the wireless LAN 17 of the power supply device 102 and the wireless LAN 41 of the vehicle side device 101, the detection information of the vehicle side device 101 can be notified. It can be displayed on the display unit 42 and can inform the driver of the vehicle that a foreign object exists.
  • an operator or the like who recognizes the foreign object can remove it in advance, so that a metal foreign object placed in the vicinity of the search coil 19 can be removed. The occurrence of problems such as heat generation can be avoided.
  • the search coil 19 including the plurality of sensor coils 19L is provided on the upper surface side of the ground coil 14, and each sensor coil 19L is provided. Detects the voltage generated in Further, the detected voltage data is compared with the reference voltage set in the reference voltage table acquired in advance, and the presence position of the foreign matter and the foreign material are detected based on the voltage increase / decrease pattern. Therefore, it is possible to reliably detect the position and material of the metallic foreign object existing in the vicinity of the search coil 19 and notify the operator of the power supply apparatus 102 and the driver of the vehicle.
  • a general portion that is a region that generates a predetermined magnetic flux density and a magnetic flux change portion that is a region that generates a magnetic flux density different from the general portion are formed.
  • the general part and the magnetic flux change part can be formed with a simple operation. Moreover, since the electric wire inside the main coil 74 can be pulled out using this notch part p1, the main coil 74 can be easily connected.
  • the search coil 36 provided on the lower surface side of the vehicle coil 35 can detect the presence of foreign matter existing in the vicinity of the vehicle coil 35.
  • the disk-type coil 71 in which the electric wire is wound in a rectangular spiral shape has been described.
  • the present invention is not limited to this, for example, in a circular shape. It is also possible to use a disk-type coil having a wound electric wire.
  • FIG. 16 is an explanatory diagram schematically showing the configuration of the disk-type coil 71 (coil for power transmission) and its peripheral devices according to the second embodiment.
  • 16A is a plan view
  • FIG. 16B is an explanatory diagram showing magnetic flux density generated when a current is passed through the electric wire
  • FIG. 16C is a cross-sectional view along AA ′ shown in FIG. 16A
  • FIG. A cross-sectional view taken along line BB ′ shown in a) is shown.
  • the disk type coil 71 is the ground coil 14 or the vehicle coil 35 shown in FIG.
  • the ferrite 72 at one corner of the disk-type coil 71 is notched, forming a notch p2.
  • region R6, R7 in which the notch part p2 is formed becomes magnetic flux density B2 of area
  • the ferrite 72 can be easily arranged.
  • the ground coil 14 shown in FIG. 1 has been described.
  • a frame-like foreign matter is formed by forming a notch in the ferrite. The presence can be detected.
  • the magnetic flux density generated on the upper surface side of the disk type coil 71 is changed by providing a step in the ferrite 72 constituting the disk type coil 71 and the main coil 74 provided on the upper surface side of the ferrite 72. . That is, a region without a step is a general portion, and a region that is lowered or raised by a step is a magnetic flux change portion.
  • FIG. 17 is an explanatory diagram schematically showing the configuration of a disk-type coil 71 (coil for power transmission) and its peripheral devices according to the third embodiment.
  • 17A is a plan view
  • FIG. 17B is an explanatory diagram showing magnetic flux density generated when a current is passed through the electric wire
  • FIG. 17C is a cross-sectional view taken along the line AA ′ shown in FIG.
  • a cross-sectional view taken along line BB ′ shown in a) is shown.
  • the disk type coil 71 is the ground coil 14 or the vehicle coil 35 shown in FIG.
  • a part on the right side in the drawing in the region around which the main coil 74 is wound is a recessed portion p3 that is recessed downward.
  • the recess p3 has a longer distance from the main coil 74 to the lid 81 than the other regions. That is, a step that faces the normal direction of the ferrite 72 is provided in a part of the main coil 74. Further, a part of the ferrite 72 is provided with a step that faces the normal direction of the ferrite 72.
  • the hollow portion p3 is a magnetic flux changing portion, and the other region is a general portion. As a result, as shown in FIG.
  • the magnetic flux densities B8 and B9 in the regions R8 and R9 where the recess p3 is formed are smaller than the magnetic flux densities B2 and B3 in the regions R2 and R3. Become. That is, when the magnetic flux density in the region R1 is B1, the relationship is (B2, B3)> (B8, B9)> B1.
  • the ferrite 72, the insulating material 73, and the main coil 74 are arranged at a low position in the region of the recess p3.
  • the configuration of the disk-type coil 71 can be simplified. Further, since a step is formed in a part of the ferrite 72 so as to face the normal direction of the ferrite 72, the configuration of the disk-type coil 71 can be simplified.
  • FIG. 18 is an explanatory view schematically showing the configuration of the disk-type coil 71 (coil for power transmission) and its peripheral devices according to the fourth embodiment.
  • 18A is a plan view
  • FIG. 18B is an explanatory diagram showing the magnetic flux density generated when a current is passed through the electric wire
  • FIG. 18C is a cross-sectional view along AA ′ shown in FIG. 18A
  • FIG. A cross-sectional view taken along line BB ′ shown in a) is shown.
  • the disk type coil 71 is the ground coil 14 or the vehicle coil 35 shown in FIG.
  • the right half of the region around which the main coil 74 is wound is a recessed portion p4 that is recessed downward. That is, the recess p4 has a longer distance from the main coil 74 to the lid 81 as compared with other regions.
  • the hollow portion p4 is a magnetic flux changing portion, and the other region is a general portion.
  • the magnetic flux densities B10 and B11 of the regions R10 and R11 where the recess p4 is formed are smaller than the magnetic flux densities B2 and B3 of the regions R2 and R3. Become. That is, when the magnetic flux density in the region R1 is B1, there is a relationship of (B2, B3)> (B10, B11)> B1.
  • the ratio of the magnetic flux densities B2, B3 and the magnetic flux densities B10, B11 changes, so that the frame-like foreign matter is placed. Can be detected.
  • the ferrite 72, the insulating material 73, and the main coil 74 are arranged at a low position in the region of the recess p4, the configuration can be simplified.
  • FIG. 19 is an explanatory diagram schematically showing the configuration of the disk-type coil 71 (coil for power transmission) and its peripheral devices according to the fifth embodiment.
  • 19A is a plan view
  • FIG. 19B is an explanatory diagram showing magnetic flux density generated when a current is passed through the main coil 74
  • FIG. 19C is a sectional view taken along line AA ′ shown in FIG.
  • FIG. 4 shows a cross-sectional view along the line BB ′ shown in FIG.
  • the disk type coil 71 is the ground coil 14 or the vehicle coil 35 shown in FIG.
  • the lower right corner in the figure of the region around which the main coil 74 is wound is a recess p5 that is recessed downward. That is, the distance from the main coil 74 to the lid 81 is longer in the recess p5 than in other regions.
  • the hollow portion p5 is a magnetic flux changing portion, and the other region is a general portion.
  • the magnetic flux densities B12 and B13 in the regions R12 and R13 where the recess p5 is formed are smaller than the magnetic flux densities B2 and B3 in the regions R2 and R3. Become. That is, when the magnetic flux density in the region R1 is B1, there is a relationship of (B2, B3)> (B12, B13)> B1.
  • the ratio of the magnetic flux densities B2, B3 and the magnetic flux densities B12, B13 changes, so that the frame-like foreign matter is placed. Can be detected.
  • the depression p5 is formed in the corner, and the ferrite 72, the insulating material 73, and the main coil 74 are arranged in a low position in this region, so that the configuration is simplified. Is possible.
  • the height of the ferrite 72, the insulating material 73, and the main coil 74 is reduced.
  • the height of the main coil 74 is not changed, and the ferrite 72 and the insulation are changed.
  • a configuration in which only the height of the material 73 is reduced is also possible.
  • FIG. 20 is an explanatory diagram schematically showing the configuration of the disk-type coil 71 (coil for power transmission) and its peripheral devices according to the sixth embodiment.
  • 20A is a plan view
  • FIG. 20B is an explanatory diagram showing magnetic flux density generated when a current is passed through the main coil 74
  • FIG. 20C is a cross-sectional view taken along line AA ′ shown in FIG.
  • FIG. 4 shows a cross-sectional view along the line BB ′ shown in FIG.
  • the disk type coil 71 is the ground coil 14 or the vehicle coil 35 shown in FIG.
  • the lower right corner in the drawing of the region around which the main coil 74 is wound is a protruding portion p6 protruding upward. That is, the distance from the main coil 74 to the lid 81 is shorter in the protrusion p6 than in other regions.
  • the protrusion p6 is a magnetic flux change part, and the other region is a general part.
  • the magnetic flux densities B14 and B15 of the regions R14 and R15 where the protrusions p6 are formed are larger than the magnetic flux densities B2 and B3 of the regions R2 and R3. Become. That is, when the magnetic flux density in the region R1 is B1, there is a relationship of (B14, B15)> (B2, B3)> B1.
  • the projecting portion p6 is formed at the corner, and the ferrite 72, the insulating material 73, and the main coil 74 are arranged at a high position in this region, so that the configuration is simplified. Is possible.
  • the height of the ferrite 72, the insulating material 73, and the main coil 74 is increased.
  • the height of the ferrite 72 and the insulating material 73 is not changed, and the main coil 74 is changed. It is also possible to adopt a configuration that raises only the height of the.
  • the ground coil 14 shown in FIG. 1 has been described.
  • the vehicle coil 35 is also formed with a hollow portion or a protruding portion so that a frame-like foreign object is formed. Can be detected.
  • FIG. 21 is an explanatory view schematically showing the configuration of the disk-type coil 71 (coil for power transmission) and its peripheral devices according to the seventh embodiment.
  • FIG. 21A is a plan view
  • FIG. 21B is an explanatory diagram showing the magnetic flux density generated when a current is passed through the main coil 74.
  • the disk type coil 71 is the ground coil 14 or the vehicle coil 35 shown in FIG.
  • a sub-coil 91 having a rectangular loop shape is formed on the upper surface of the insulating material 73 using an electric wire inside the main coil 74. That is, the main coil 74 in which the electric wire is wound in a spiral shape has an opening Q1 at the center, and a subcoil 91 is formed in the opening.
  • a current flows through the spiral loop, and at the same time, a current flows through the subcoil 91.
  • the magnetic flux density of the disk type coil 71 changes.
  • the magnetic flux density B16 in the region R16 is larger than the magnetic flux density B2 in the surrounding region R2, and the magnetic flux density B17 in the region R17 is smaller than the magnetic flux density B2.
  • the relationship is B16> (B2, B3)> B17> B1.
  • Regions R16 and R17 are magnetic flux changing portions, and the other regions are general portions.
  • the subcoil 91 is formed by using the electric wire at the end of the main coil 74, the magnetic flux changing portion and the general portion can be formed with a simple configuration. Furthermore, since the subcoil 91 is formed in the central opening Q1 of the main coil 74, the electric wires can be easily arranged. In FIG. 21, the example in which the main coil 74 is wound only once to form the subcoil 91 has been described. However, the subcoil 91 can be formed by winding a plurality of turns.
  • the ground coil 14 shown in FIG. 1 has been described. Similarly, it is possible to detect the presence of a frame-like foreign matter by forming a sub-coil for the vehicle coil 35 as well. it can.
  • the search coil 36 is provided on the lower surface side of the vehicle coil 35 and the search coil 19 is provided on the upper surface side of the ground coil 14 has been described, but the present invention is not limited to this.
  • at least one of the search coils may be provided.
  • the search coil 19 is provided only on the upper surface side of the ground coil 14, it is possible to detect foreign matter existing in the vicinity of the ground coil 14.
  • the search coil 36 is provided only on the lower surface of the vehicle coil 35, foreign matter existing in the vicinity of the vehicle coil 35 can be detected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

Une partie découpée (p1) est formée dans une partie d'une ferrite (72) disposée dans une bobine de type disque (71). La formation de la partie découpée (p1) provoque une modification de la densité de flux magnétique produite par une bobine principale (74), ce qui entraîne la formation d'une partie générale ayant une densité de flux magnétique prédéfinie et d'une partie à flux magnétique modifié ayant une densité de flux magnétique différente de celle de la partie générale. Si un corps étranger en forme de cadre est présent du côté surface supérieure de la bobine de type disque (71), le rapport entre la densité de flux magnétique détectée dans la partie générale et la densité de flux magnétique détectée dans la partie à flux magnétique modifié s'en trouvera modifié par comparaison avec une situation dans laquelle le corps étranger n'est pas disposé sur ce dernier. Par conséquent, la présence d'un corps étranger en forme de cadre peut être détectée sur la base de la modification.
PCT/JP2015/052541 2015-01-29 2015-01-29 Structure de bobine de transmission de puissance dans un dispositif de transmission de puissance sans contact Ceased WO2016121055A1 (fr)

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PCT/JP2015/052541 WO2016121055A1 (fr) 2015-01-29 2015-01-29 Structure de bobine de transmission de puissance dans un dispositif de transmission de puissance sans contact

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PCT/JP2015/052541 WO2016121055A1 (fr) 2015-01-29 2015-01-29 Structure de bobine de transmission de puissance dans un dispositif de transmission de puissance sans contact

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WO2016121055A1 true WO2016121055A1 (fr) 2016-08-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111263970A (zh) * 2017-10-19 2020-06-09 罗伯特·博世有限公司 用于无接触地传输数据和能量并且用于角度测量的装置

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JPH0917665A (ja) * 1995-06-28 1997-01-17 Toyota Autom Loom Works Ltd 充電装置のカプラ
JP2012191704A (ja) * 2011-03-09 2012-10-04 Panasonic Corp 非接触充電モジュール及び非接触充電機器
WO2012157454A1 (fr) * 2011-05-19 2012-11-22 ソニー株式会社 Dispositif d'alimentation électrique, système d'alimentation électrique et dispositif électronique
JP2012249401A (ja) * 2011-05-27 2012-12-13 Nissan Motor Co Ltd 非接触給電装置
JP2013192391A (ja) * 2012-03-14 2013-09-26 Sony Corp 検知装置、受電装置、送電装置及び非接触給電システム

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Publication number Priority date Publication date Assignee Title
JPH0917665A (ja) * 1995-06-28 1997-01-17 Toyota Autom Loom Works Ltd 充電装置のカプラ
JP2012191704A (ja) * 2011-03-09 2012-10-04 Panasonic Corp 非接触充電モジュール及び非接触充電機器
WO2012157454A1 (fr) * 2011-05-19 2012-11-22 ソニー株式会社 Dispositif d'alimentation électrique, système d'alimentation électrique et dispositif électronique
JP2012249401A (ja) * 2011-05-27 2012-12-13 Nissan Motor Co Ltd 非接触給電装置
JP2013192391A (ja) * 2012-03-14 2013-09-26 Sony Corp 検知装置、受電装置、送電装置及び非接触給電システム

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111263970A (zh) * 2017-10-19 2020-06-09 罗伯特·博世有限公司 用于无接触地传输数据和能量并且用于角度测量的装置
CN111263970B (zh) * 2017-10-19 2022-06-24 罗伯特·博世有限公司 用于无接触地传输数据和能量并且用于角度测量的装置
US11373801B2 (en) 2017-10-19 2022-06-28 Robert Bosch Gmbh Device for the contactless transmission of data and of energy and for angle measurement

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