JP2011204836A - Coil unit, noncontact power receiving device, noncontact power transmitting device, and vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil unit reduced in dielectric loss, a noncontact power receiving device, a noncontact power transmitting device, and a vehicle.SOLUTION: The coil unit includes a secondary self resonance coil 110 attaining at least one of power transmission and power reception to and from an externally disposed primary self resonance coil by resonance of electromagnetic fields, a plate 197 extending in an axial direction of the secondary self resonance coil 110 and supporting the secondary self resonance coil 110, and a bobbin 196 supporting the plate 197.

Description

  The present invention relates to a coil unit, a contactless power receiving device, a contactless power transmitting device, and a vehicle, and more particularly to a coil unit that can receive power or transmit power by resonance of an electromagnetic field.

  In recent years, a non-contact charging method has attracted attention as a method for charging a battery mounted on a vehicle.

  For example, an electric vehicle described in Japanese Patent Application Laid-Open No. 2009-106136 is a secondary that is configured to be magnetically coupled to a primary self-resonant coil outside the vehicle by magnetic field resonance and to receive power from the primary self-resonant coil. A self-resonant coil, a secondary coil configured to be able to receive power from the secondary self-resonant coil by electromagnetic induction, a rectifier that rectifies the power received by the secondary coil, and a power storage device that stores the power rectified by the rectifier, And an electric motor that receives a supply of electric power from the power storage device and generates a vehicle driving force.

JP 2009-106136 A

  Japanese Patent Application Laid-Open No. 2009-106136 does not describe a secondary self-resonant coil, a secondary coil fixing method, and the like. For example, as a method of attaching the coil, a method of attaching a secondary self-resonant coil and a secondary coil to a bobbin in which a spiral groove is formed can be considered.

  However, if the secondary self-resonant coil is mounted in the spiral groove, the contact area between the secondary self-resonant coil and the bobbin increases, and if the bobbin is made of a dielectric material such as resin, the dielectric loss is large. Become.

  The present invention has been made in view of the problems as described above, and an object thereof is to provide a coil unit, a non-contact power receiving device, a non-contact power transmitting device, and a vehicle in which dielectric loss is reduced. It is.

  A coil unit according to the present invention includes a second self-resonant coil capable of at least one of transmitting and receiving electric power by resonance of an electromagnetic field with a first self-resonant coil provided outside, and a second self-resonant coil And a plate that supports the second self-resonant coil and a support member that supports the plate. Preferably, the plate is provided so as to be removable from the support member.

  Preferably, the plate is formed with a recess capable of receiving the second self-resonant coil, and the width of the recess is larger than the diameter of the second self-resonant coil.

  Preferably, an electromagnetic induction coil is further provided, and the electromagnetic induction coil transmits power by electromagnetic induction to the second self-resonant coil that transmits power to the first self-resonant coil, and receives power from the first self-resonant coil. And / or receiving electric power from the second self-resonant coil by electromagnetic induction. The electromagnetic induction coil is supported by a plate.

  Preferably, the support member is a bobbin disposed inside the second self-resonant coil, and the plate is provided on the outer peripheral surface of the bobbin.

  A non-contact power receiving apparatus according to the present invention includes the coil unit and can charge a charger mounted on a vehicle.

The vehicle which concerns on this invention is provided with the said non-contact electric power receiving apparatus and a charger.
A non-contact power transmission apparatus according to the present invention includes the coil unit and is supplied with electric power from an external power source outside the vehicle.

  According to the coil unit, the non-contact power receiving device, the non-contact power transmission device and the vehicle according to the present invention, it is possible to reduce the dielectric loss.

It is a whole lineblock diagram of the non-contact electric supply system according to an embodiment of the invention. It is a figure for demonstrating the principle of the power transmission by the resonance method. It is the figure which showed the relationship between the distance from an electric current source (magnetic current source), and the intensity | strength of an electromagnetic field. It is a schematic diagram which shows the electromagnetic shielding cases 190 and 250 shown in FIG. 1, and the surrounding structure. 3 is a perspective view of a coil case 191. FIG. It is a disassembled perspective view of the coil case 191 shown in FIG. 4 is a perspective view showing a part of the peripheral surface of a bobbin 196. FIG. It is a side view of the plate 197. It is a side view of the plate 197 provided in the position different from the plate 197 shown in FIG. It is a front view of a plate 197. It is a perspective view which shows the modification of plate 197. FIG. It is a perspective view which shows the 1st modification of a coil unit. It is a side view of the plate 197 with which the bobbin 196 shown in FIG. 12 was mounted | worn. It is a perspective view which shows the 2nd modification of a coil unit. It is a perspective view which shows the 3rd modification of a coil unit.

  FIG. 1 is an overall configuration diagram of a non-contact power feeding system according to an embodiment of the present invention. Referring to FIG. 1, the non-contact power supply system includes an electric vehicle 100 and a power supply device (non-contact power transmission device) 200. Electric vehicle 100 includes a non-contact power receiving apparatus 101, a power control unit (hereinafter also referred to as “PCU (Power Control Unit)”) 160, a motor 170, and a vehicle ECU (Electronic Control Unit) 145. Non-contact power receiving apparatus 101 includes a coil unit 180, a rectifier 130, a DC / DC converter 140, a power storage device 150, and an electric device 400 installed in an electromagnetic shielding case 190.

  The configuration of the electric vehicle 100 is not limited to the configuration shown in FIG. 1 as long as the vehicle is driven by a motor. For example, a hybrid vehicle including a motor and an internal combustion engine, a fuel cell vehicle including a fuel cell, and the like are included. The coil unit 180 includes a secondary self-resonant coil (second self-resonant coil) 110 and a secondary coil 120 as an electromagnetic induction coil. The coil unit 180 is accommodated in an electromagnetic shielding case 190.

  Secondary self-resonant coil 110 is installed, for example, at the bottom of the vehicle body. Both ends of the secondary self-resonant coil 110 are free ends, and the secondary self-resonant coil 110 has a stray capacitance. The secondary self-resonant coil 110 receives power from the power feeder 200 by resonating with a primary self-resonant coil (first self-resonant coil) 240 (described later) of the power feeder 200 via an electromagnetic field, and the power feeder 200. It is possible to at least one of transmitting power to the power source. Although both ends of secondary self-resonant coil 110 are free ends, both ends of secondary self-resonant coil 110 may be connected to a separately provided capacitor (not shown).

  The secondary self-resonant coil 110 and the secondary self-resonant coil 240 are connected to the primary self-resonant coil 240 and the secondary self-resonant coil 240 based on the distance from the primary self-resonant coil 240 and the resonance frequency of the primary self-resonant coil 240 and the secondary self-resonant coil 110. The number of turns is appropriately set so that the Q value (for example, Q> 100) indicating the resonance intensity with the self-resonant coil 110 and κ indicating the degree of coupling increase.

  Secondary coil 120 is installed coaxially with secondary self-resonant coil 110 and can be magnetically coupled to secondary self-resonant coil 110 by electromagnetic induction. The secondary coil 120 takes out the electric power received by the secondary self-resonant coil 110 by electromagnetic induction and outputs it to the rectifier 130, and transmits the electric power transmitted from the secondary self-resonant coil 110 to the primary self-resonant coil 240. At least one of supplying to the next self-resonant coil 110 is possible.

  The rectifier 130 rectifies the AC power extracted by the secondary coil 120. DC / DC converter 140 converts the power rectified by rectifier 130 into a voltage level of power storage device 150 based on a control signal from vehicle ECU 145 and outputs the voltage to power storage device 150. Note that when receiving power from the power supply apparatus 200 while the vehicle is running, the DC / DC converter 140 may convert the power rectified by the rectifier 130 into a system voltage and directly supply it to the PCU 160. DC / DC converter 140 is not necessarily required, and the AC power extracted by secondary coil 120 may be directly rectified by rectifier 130 and then directly supplied to power storage device 150.

  Power storage device 150 is a rechargeable DC power source, and includes, for example, a secondary battery such as lithium ion or nickel metal hydride. The power storage device 150 stores power supplied from the DC / DC converter 140 and also stores regenerative power generated by the motor 170. Then, power storage device 150 supplies the stored power to PCU 160. Note that a large-capacity capacitor can also be used as the power storage device 150, and is a power buffer that can temporarily store the power supplied from the power supply device 200 and the regenerative power from the motor 170 and supply the stored power to the PCU 160. Anything is acceptable.

  PCU 160 drives motor 170 with power output from power storage device 150 or power directly supplied from DC / DC converter 140. PCU 160 also rectifies the regenerative power generated by motor 170 and outputs the rectified power to power storage device 150 to charge power storage device 150. The motor 170 is driven by the PCU 160 to generate a vehicle driving force and output it to driving wheels. Motor 170 generates power using kinetic energy received from an engine (not shown) in the case of drive wheels or a hybrid vehicle, and outputs the generated regenerative power to PCU 160.

  Vehicle ECU 145 controls DC / DC converter 140 when power is supplied from power supply device 200 to electric vehicle 100. The vehicle ECU 145 controls the voltage between the rectifier 130 and the DC / DC converter 140 to a predetermined target voltage by controlling the DC / DC converter 140, for example. In addition, vehicle ECU 145 controls PCU 160 based on the traveling state of the vehicle and the state of charge of power storage device 150 (also referred to as “SOC (State Of Charge)”) when the vehicle is traveling.

  The electric device 400 installed in the electromagnetic shielding case 190 comprehensively shows an electric drive unit installed in the electromagnetic shielding case 190 for performing abnormality monitoring, display, and cooling. The electric device 400 includes, for example, a cooling fan, an electric pump for cooling, a display device such as an LED (Light Emitting Diode), a temperature detection device that detects an internal temperature, and the like.

  On the other hand, power supply apparatus 200 includes an AC power supply 210, a high-frequency power driver 220, and a coil unit 280. Coil unit 280 includes a primary coil 230 as an electromagnetic induction coil and a primary self-resonant coil 240. The coil unit 280 is accommodated in the electromagnetic shielding case 250. In the electromagnetic shielding case 250, in addition to the coil unit 280, an electric device 500 and the like are also accommodated.

  AC power supply 210 is a power supply external to the vehicle, for example, a system power supply. The high frequency power driver 220 converts power received from the AC power source 210 into high frequency power, and supplies the converted high frequency power to the primary coil 230. Note that the frequency of the high-frequency power generated by the high-frequency power driver 220 is, for example, 1 M to several tens of MHz.

  Primary coil 230 is installed coaxially with primary self-resonant coil 240 and can be magnetically coupled to primary self-resonant coil 240 by electromagnetic induction. The primary coil 230 feeds high-frequency power supplied from the high-frequency power driver 220 to the primary self-resonant coil 240 by electromagnetic induction.

  Primary self-resonant coil 240 is installed near the ground, for example. The primary self-resonant coil 240 is also an LC resonant coil in which both ends of the coil are free ends. Although both ends of primary self-resonant coil 240 are free ends, a capacitor (not shown) may be separately connected to both ends of primary self-resonant coil 240. Primary self-resonant coil 240 transmits electric power to electric vehicle 100 by resonating with secondary self-resonant coil 110 of electric vehicle 100 via an electromagnetic field, and receives electric power transmitted from secondary self-resonant coil 110. At least one of doing is possible. When primary self-resonant coil 240 receives power from secondary self-resonant coil 110, primary coil 230 receives power from primary self-resonant coil 240 by electromagnetic induction.

  Primary self-resonant coil 240 also has a Q value (for example, Q> 100 based on the distance from secondary self-resonant coil 110 of electric vehicle 100, the resonance frequency of primary self-resonant coil 240 and secondary self-resonant coil 110, and the like. ) And the degree of coupling κ and the like are appropriately set such that the number of turns is increased.

  The electric device 500 installed inside the electromagnetic shielding case 250 comprehensively shows an electric drive unit installed for monitoring an abnormality, displaying and cooling inside the electromagnetic shielding case 250. The electric device 500 includes, as electric loads, for example, a cooling fan, an electric pump for cooling, a display device such as an LED, and a temperature detection device that detects an internal temperature.

  FIG. 2 is a diagram for explaining the principle of power transmission by the resonance method. Referring to FIG. 2, in this resonance method, in the same way as two tuning forks resonate, two LC resonance coils having the same natural frequency resonate in an electromagnetic field (near field), and thereby, from one coil. Electric power is transmitted to the other coil via an electromagnetic field.

  Specifically, the primary coil 320 is connected to the high-frequency power source 310, and high-frequency power of 1 M to several tens of MHz is supplied to the primary self-resonant coil 330 that is magnetically coupled to the primary coil 320 by electromagnetic induction. The primary self-resonant coil 330 is an LC resonator based on the inductance of the coil itself and stray capacitance (including the capacitance of the capacitor when a capacitor is connected to the coil), and has the same resonance frequency as that of the primary self-resonant coil 330. Resonates with the secondary self-resonant coil 340 having an electromagnetic field (near field). Then, energy (electric power) moves from the primary self-resonant coil 330 to the secondary self-resonant coil 340 via the electromagnetic field. The energy (electric power) transferred to the secondary self-resonant coil 340 is taken out by the secondary coil 350 magnetically coupled to the secondary self-resonant coil 340 by electromagnetic induction and supplied to the load 360. Note that power transmission by the resonance method is realized when the Q value indicating the resonance intensity between the primary self-resonant coil 330 and the secondary self-resonant coil 340 is greater than 100, for example.

  1 will be described. The AC power supply 210 and the high-frequency power driver 220 in FIG. 1 correspond to the high-frequency power supply 310 in FIG. Further, the primary coil 230 and the primary self-resonant coil 240 in FIG. 1 correspond to the primary coil 320 and the primary self-resonant coil 330 in FIG. 2, respectively, and the secondary self-resonant coil 110 and the secondary coil 120 in FIG. This corresponds to the secondary self-resonant coil 340 and the secondary coil 350 in FIG. In addition, the rectifier 130 and the subsequent parts in FIG.

  For this reason, when charging the power storage device 150, first, electric power is supplied from the primary coil 230 to the primary self-resonant coil (first self-resonant coil) 240 by electromagnetic induction. Thereafter, electric power is received from the primary self-resonant coil 240 to the secondary self-resonant coil (second self-resonant coil) 110 by resonance of the electromagnetic field. The electric power received by the secondary self-resonant coil 110 is transferred to the secondary coil 120 by electromagnetic induction. The electric power transferred to secondary coil 120 is supplied to power storage device 150 via rectifier 130 and converter 140.

On the other hand, when supplying the power stored in the power storage device 150 to an external load,
Electric power is supplied to the secondary coil 120 via the converter 140 and the rectifier 130. Thereafter, electric power is supplied from the secondary coil 120 to the secondary self-resonant coil 110 by electromagnetic induction. The electric power supplied to the secondary self-resonant coil 110 is transmitted to the primary self-resonant coil 240 by electromagnetic field resonance. The electric power received by the primary self-resonant coil 240 is supplied to the primary coil 230 by electromagnetic induction. The electric power supplied to the primary coil 230 is supplied to an external load via a driver or the like.

  FIG. 3 is a diagram showing the relationship between the distance from the current source (magnetic current source) and the intensity of the electromagnetic field. Referring to FIG. 3, the electromagnetic field is composed of three components. A curve k1 is a component inversely proportional to the distance from the wave source, and is referred to as a “radiating electric field”. A curve k2 is a component inversely proportional to the square of the distance from the wave source, and is referred to as an “induced electric field”. The curve k3 is a component that is inversely proportional to the cube of the distance from the wave source, and is referred to as an “electrostatic field”.

  The “electrostatic field” is a region where the intensity of the electromagnetic wave suddenly decreases with the distance from the wave source. In the resonance method, energy (electric power) is utilized using the near field (evanescent field) in which this “electrostatic field” is dominant. Is transmitted. That is, by resonating a pair of resonators having the same natural frequency (for example, a pair of LC resonance coils) in a near field where the “electrostatic field” is dominant, the resonance from one resonator (primary self-resonance coil) to the other Energy (electric power) is transmitted to the resonator (secondary self-resonant coil). Since this “electrostatic field” does not propagate energy far away, the resonance method can transmit power with less energy loss than electromagnetic waves that transmit energy (electric power) by “radiant electric field” that propagates energy far away. it can.

  FIG. 4 is a schematic diagram showing the electromagnetic shielding cases 190 and 250 shown in FIG. 1 and the surrounding structure.

  As shown in FIG. 4, a coil case 191 is disposed in the electromagnetic shielding case 190. The coil case 191 accommodates the secondary self-resonant coil 110 and the secondary coil 120 shown in FIG. An opening 195 is formed on the lower surface of the electromagnetic shielding case 190. An electromagnetic shielding material (electromagnetic shield) is affixed to the electromagnetic shielding case 190, and the electromagnetic shielding material is a low-impedance substance, such as a thin copper foil.

  The electromagnetic shielding case 190 suppresses the electromagnetic field formed by the secondary self-resonant coil 110 and the primary self-resonant coil 240 from leaking to the vehicle side.

  A coil case 291 is disposed in the electromagnetic shielding case 250. The coil case 291 houses the primary self-resonant coil 240 and the primary coil 230 shown in FIG. An opening 255 is formed on the upper surface of the electromagnetic shielding case 250. An electromagnetic shielding material is also attached to the electromagnetic shielding case 250.

  FIG. 5 is a perspective view of the coil case 191. As shown in FIG. 5, the coil case 191 includes a pan portion 193 formed in a bottomed cylindrical shape, and a top plate portion 192 disposed on the pan portion 193. The top plate portion 192 is fixed to, for example, the lower surface of a vehicle floor panel. And the coil case 191 is arrange | positioned so that it may protrude toward the downward direction from the lower surface of a floor panel.

  6 is an exploded perspective view of the coil case 191 shown in FIG. As shown in FIG. 6, a bobbin 196 is disposed in a pot portion 193 formed in a bottomed cylindrical shape. The bobbin 196 is formed in a cylindrical shape, and a plurality of plates 197 are mounted on the outer peripheral surface of the bobbin 196 at intervals in the circumferential direction. Secondary self-resonant coil 110 is supported by plate 197. For example, six or eight plates 197 are provided at equal intervals.

  The coil unit includes a secondary self-resonant coil 110, a plate 197 that supports the secondary self-resonant coil 110, and a bobbin 196 as a support member that supports the plate 197. The plate 197 is made of resin.

  Since the area where the plate 197 contacts the secondary self-resonant coil 110 is small, the dielectric loss can be reduced. Accordingly, in FIG. 1, when power is transferred between the secondary self-resonant coil 110 and the primary self-resonant coil 240, it is possible to improve power transfer efficiency.

  Furthermore, since the contact area between the secondary self-resonant coil 110 and the plate 197 is small and the area where the secondary self-resonant coil 110 is in contact with air is large, the secondary self-resonant coil 110 can be cooled well.

  FIG. 7 is a perspective view showing a part of the peripheral surface of the bobbin 196. As shown in FIG. 7, an insertion groove 198 is formed on the outer peripheral surface of the bobbin 196. The plate 197 is mounted in the insertion groove 198.

  7 and FIG. 6, a plurality of bosses 199 are formed on the inner peripheral surface of the bobbin 196 at intervals.

  The boss 199 is formed with a screw hole. The pan portion 193 and the bobbin 196 are fixed to each other by a bolt 194, and the bolt 194 is screwed into a screw hole of the boss 199. The bolt 194 is an example of a fixing member, and can be appropriately removed from the top plate portion 192, the pan portion 193, and the bobbin 196.

  Further, the top plate portion 192 and the bobbin 196 are also fixed to each other by a bolt 194. The plate 197 is sandwiched between the top plate portion 192 and the bottom surface of the pan portion 193, and is fixed by the top plate portion 192 and the bottom surface of the pan portion 193. In order to firmly fix the plate 197, for example, the plate 197 is fixed to the bobbin 196 from the inner peripheral surface side of the bobbin 196 using a fixing member such as a bolt.

  For this reason, the plate 197 can be removed from the bobbin 196 by removing the top plate part 192 and the pan part 193 from the bobbin 196 and removing a bolt or the like for fixing the plate 197.

  As described above, since the plate 197 is detachably provided from the bobbin 196, for example, when replacing the attached secondary self-resonant coil 110 with another secondary self-resonant coil 110 having a different length, Only by exchanging the plate 197, the secondary self-resonant coils 110 having different lengths can be mounted.

  When a groove for mounting the secondary self-resonant coil 110 is formed on the outer peripheral surface of the bobbin 196, the entire bobbin 196 needs to be replaced. As described above, according to the coil case 191 according to the present embodiment, by replacing the plate 197, it is possible to cope with various kinds of secondary self-resonant coils 110, and replacement of the secondary self-resonant coil 110 can be performed. It can be done easily.

  In FIG. 6, the plate 197 also supports the secondary coil 120. A plate 197 maintains the distance between the secondary coil 120 and the secondary self-resonant coil 110.

  The distance between the secondary coil 120 and the secondary self-resonant coil 110 affects the distance at which power can be transferred between the coil unit 180 and the coil unit 280 and the power transfer efficiency.

  The plate 197 supports the distance between the secondary coil 120 and the secondary self-resonant coil 110 to be a predetermined distance, so that power can be transferred while maintaining the power transfer efficiency within a predetermined range. It is possible to maintain the distance that can be within a predetermined range.

  In FIG. 6, both the secondary self-resonant coil 110 and the secondary coil 120 are formed so as to extend spirally around the virtual central axis. The secondary self-resonant coil 110 and the secondary coil 120 are not lap-wound but are single-layer wound. In the example shown in FIG. 6, secondary self-resonant coil 110 is formed to extend in an arc shape and extend in the direction of the imaginary central axis as it goes in the extending direction of secondary self-resonant coil 110. . The secondary resonance coil 110 is wound with an interval so that the coil wire constituting the secondary resonance coil 110 does not contact. The primary resonance coil 330 is also formed in the same manner as the secondary resonance coil 110.

  Similarly, the secondary coil 120 is also formed so as to extend in an arc shape and extend in the virtual center line direction as it goes in the extending direction of the secondary coil 120. The secondary coil 120 is also wound with an interval so that the coil wire constituting the secondary coil 120 does not contact. Note that the primary coil is formed in the same manner as the secondary coil 120. The virtual center axis of the secondary self-resonant coil 110 and the virtual center axis of the secondary coil 120 coincide with each other, and the secondary coil 120 is disposed on the vehicle side with respect to the secondary self-resonant coil 110.

  A plurality of plates 197 are provided on the outer peripheral surface of the bobbin 196 at intervals, and each plate 197 has a recess for receiving the secondary self-resonant coil 110 and the secondary coil 120.

  In the example shown in FIG. 6, the number of turns of the secondary self-resonant coil 110 is less than one, and the number of turns of the secondary coil 120 is also about one.

  When a capacitor is connected to both ends of the secondary self-resonant coil 110, both ends of the secondary self-resonant coil 110 are formed so as to penetrate the outer peripheral surface of the bobbin 196 and reach into the bobbin 196. Connected to a capacitor located in 196.

  FIG. 8 is a side view of the plate 197. As shown in FIG. 8, the plate 197 is formed with a recess 201 that receives the secondary coil 120 and a recess 202 that receives the secondary self-resonant coil 110.

  FIG. 9 is a side view of the plate 197 provided at a position different from the plate 197 shown in FIG. As shown in FIGS. 9 and 8, the positions of the recesses 201 and the recesses 202 differ depending on each plate. The width of the recess 202 is formed to be larger than the diameter of the secondary self-resonant coil 110. The diameter of the secondary self-resonant coil 110 is a diameter of a cross section perpendicular to the extending direction of the secondary self-resonant coil 110.

  FIG. 10 is a front view of the plate 197. In FIG. 10, for example, when the secondary self-resonant coil 110 is replaced with another secondary self-resonant coil 110 having a different length, the inclination angle of the secondary self-resonant coil 110 changes.

  Since the width of the recess 202 is larger than the diameter of the secondary self-resonant coil 110, the secondary self-resonant coil 110 can be inserted into the recess 202 even if the inclination angle of the secondary self-resonant coil 110 is increased. . The secondary self-resonant coil 110 can be prevented from coming into contact with both the upper inner wall surface and the lower inner wall surface of the recess 202 and the secondary self-resonant coil 110 being deformed.

  Therefore, even when the already installed secondary self-resonant coil 110 is replaced with a secondary self-resonant coil 110 having a slightly different length, there is no need to replace even the plate 197, and the secondary self-resonant coil can be easily obtained. The coil 110 can be replaced.

  Similarly, the width of the recess 201 is formed to be larger than the diameter of the secondary coil 120. The diameter of the secondary coil 120 is a diameter of a cross section perpendicular to the extending direction of the secondary coil 120.

  FIG. 11 is a perspective view showing a modified example of the plate 197. In the example shown in FIG. 11, the plate 197 includes a support part 204 in which a concave part 201 and a concave part 202 are formed, and a base part 205 connected to the support part 204.

  The base 205 is inserted into an insertion groove 206 formed in the bobbin 196. The base portion 205 is formed so that the width increases as the distance from the support portion 204 increases. The width of the insertion groove 206 is also formed so as to increase from the outer peripheral surface side of the bobbin 196 toward the inner peripheral surface side. According to the plate 197 shown in FIG. 11, since the base portion 205 is supported by the inner peripheral surface of the insertion groove 206, it is possible to suppress the plate 197 from dropping from the bobbin 196.

  In the present embodiment, the example in which the secondary self-resonant coil 110 is a coil of about one turn has been described. However, the secondary self-resonant coil 110 has one or more turns as shown in FIG. Also good.

  FIG. 13 is a side view of the plate 197 attached to the bobbin 196 shown in FIG. 12, and a plurality of recesses 202 for receiving the secondary self-resonant coil 110 are formed in the plate 197 at intervals.

  FIG. 14 is a perspective view showing a second modification of the coil unit. In the example shown in FIG. 14, a plurality of plates 197 are arranged on the inner peripheral surface of the bobbin 196 at intervals. The secondary self-resonant coil 110 and the secondary coil 120 are disposed in the bobbin 196 and supported by the plate 197.

  According to the example shown in FIG. 14, the bobbin 196 has a function as a support member that supports the plate 197 and a function as a protective case that protects the secondary self-resonant coil 110 and the secondary coil 120.

  FIG. 15 is a perspective view showing a third modification of the coil unit. In the example shown in FIG. 15, the secondary self-resonant coil 110 has a U-shaped cross section. By making the cross-sectional shape of the secondary self-resonant coil 110 U-shaped, the surface area of the secondary self-resonant coil 110 is larger than the surface area of the secondary self-resonant coil 110 having a circular cross-sectional shape.

  Since high-frequency current flows in the secondary self-resonant coil 110 when power is delivered, the resistance of the secondary self-resonant coil 110 can be kept low by ensuring a large area of the secondary self-resonant coil 110.

  The U-shaped secondary self-resonant coil 110 is more rigid and difficult to deform than a coil whose cross-sectional shape is circular. For this reason, it is not necessary to wind around the plate 197 in a state where a tensile force is applied to the secondary self-resonant coil 110. For this reason, when the secondary self-resonant coil 110 is mounted, the plate 197 only needs to have a rigidity that allows the plate 197 to hold the secondary self-resonant coil 110.

  For this reason, in the example shown in FIG. 15, the bobbin that supports the plate 197 is omitted. One end of the plate 197 is inserted into a groove formed in the top plate portion 192. The top plate portion 192 and the pan portion 193 are connected by a bolt or the like (not shown), and the plate 197 is connected to the top plate portion 192 and the pan portion 193 so that the top plate portion 192 and the pan portion 193 are connected to each other. It is sandwiched between and fixed. That is, in the example shown in FIG. 15, the top plate portion 192 functions as a support member that supports the plate 197. The plate 197 is detachable from the top plate portion 192. As a result, even when the secondary self-resonant coil 110 and the secondary coil 120 having different lengths are replaced, the secondary self-resonant coil 110 and the secondary coil 120 having different lengths can be mounted by replacing the plate 197. can do.

  Thus, when the highly rigid secondary self-resonant coil 110 is employed, the bobbin can be omitted and the number of parts can be reduced.

  In the example shown in FIG. 6, the secondary coil 120 and the secondary self-resonant coil 110 are single-layered. Therefore, when mounting the secondary coil 120 and the secondary self-resonant coil 110, first, the bobbin 196 with the plate 197 mounted is prepared. Then, two coils are mounted from the side of the bobbin 196. One coil is a secondary self-resonant coil 110, and a wiring is connected to the end of the other coil to form a secondary coil 120.

  Further, as another example of a method for mounting the secondary coil 120 or the like, the following method can also be employed. 6 and 8, a plurality of concave portions 201 formed in each plate 197 are arranged in a spiral shape. Therefore, when mounting the secondary coil 120, first, a coil extending in a spiral shape is prepared. And by rotating the said coil, you may make it insert a coil in the recessed part 201 of each plate 197 sequentially. Then, after the insertion of the coil into the recess 201 is completed, wiring or the like is connected to the end portion, and the end portion is fixed. Thereby, the mounting of the secondary coil 120 is completed. Similarly, when the secondary self-resonant coil 110 is mounted, first, a coil extending in a spiral shape is prepared. Since a plurality of the concave portions 202 are also arranged in a spiral shape, the concave portions 202 of the respective plates 197 can be sequentially inserted by rotating the coil.

  According to this mounting method, the distance between the secondary self-resonant coil 110 and the secondary coil 120 can be adjusted by adjusting the rotation amount of each coil. The distance between secondary self-resonant coil 110 and secondary coil 120 affects the power transfer efficiency and the distance at which power can be transferred. For this reason, the distance between the secondary self-resonant coil 110 and the secondary coil 120 can be changed according to the vehicle type.

  Further, in the secondary self-resonant coil 110 in which both ends of the secondary self-resonant coil 110 are free ends, the secondary self-resonant coil 110 is rotated by rotating the secondary self-resonant coil 110 even after the secondary coil 120 is fixed. The distance between the resonant coil 110 and the secondary coil 120 can be adjusted.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

  The present invention can be applied to a coil unit, a non-contact power receiving device, a non-contact power transmitting device, and a vehicle, and in particular, a coil unit that can receive power or transmit power by resonance of an electromagnetic field. It is suitable for.

DESCRIPTION OF SYMBOLS 100 Electric vehicle, 101 Contactless power receiving device, 110 Secondary self-resonant coil, 120 Secondary coil, 130 Rectifier, 140 Converter, 150 Power storage device, 170 Motor, 180 Coil unit, 190,250 Electromagnetic shielding case, 191 Coil case 192, top plate portion, 193 pan portion, 194 bolt, 195 opening, 196 bobbin, 197 plate, 198 insertion groove, 199 boss, 200 power feeding device, 201, 202 recess, 203 adjustment member, 204 support portion, 205 base, 206 Insertion groove, 210 AC power source, 220 High frequency power driver, 230 Primary coil, 240 Primary self-resonant coil, 255 opening, 280 Coil unit, 291 Coil case, 310 High frequency power source, 320 Primary coil, 330 Primary self-resonant core 340 secondary self-resonant coil 350 secondary coil.

Claims (8)

A second self-resonant coil capable of at least one of transmitting and receiving power by resonance of an electromagnetic field with the first self-resonant coil provided outside;
A plate supporting the second self-resonant coil;
A support member for supporting the plate;
Coil unit with   The coil unit according to claim 1, wherein the plate is detachably provided from the support member. The plate is formed with a recess capable of receiving the second self-resonant coil,
The coil unit according to claim 1 or 2, wherein a width of the recess is larger than a diameter of the second self-resonant coil. An electromagnetic induction coil;
The electromagnetic induction coil transmits electric power to the second self-resonant coil that transmits electric power to the first self-resonant coil by electromagnetic induction, and the second self-resonant receives electric power from the first self-resonant coil. At least one of receiving electric power from the coil by electromagnetic induction,
The coil unit according to any one of claims 1 to 3, wherein the electromagnetic induction coil is supported by the plate. The support member is a bobbin disposed inside the second self-resonant coil;
The coil unit according to any one of claims 1 to 4, wherein the plate is provided on an outer peripheral surface of the bobbin.   A non-contact power receiving apparatus including the coil unit according to claim 1 and capable of charging a charger mounted on a vehicle.   A vehicle comprising the contactless power receiving device according to claim 6 and the charger.   A non-contact power transmission apparatus including the coil unit according to claim 1, wherein electric power is supplied from an external power source outside the vehicle.

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