JP2016013033A - Foreign matter removal device, ground side facility of non-contact power supply system, and non-contact power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foreign matter removal device for a coil device which can suppress long-term deterioration and where removal performance of a foreign matter hardly decreases, and a ground side facility of a non-contact power supply system and the non-contact power supply system.SOLUTION: A foreign matter removal device 30 for a coil device is employed, where the foreign matter removal device 30 includes liquid injection parts 31, 32, 33, and 34 for sweeping away, by injection of liquid 101, a foreign matter 100 existing in a region where a magnetic field passes through, where the magnetic field is generated due to non-contact power supply using magnetic coupling between a power reception side pad 11 and a power transmission side pad 21.

Description

  The present invention relates to a foreign substance removing device, ground-side equipment of a non-contact power feeding system, and a non-contact power feeding system.

  2. Description of the Related Art In recent years, a non-contact power feeding system that generates a magnetic field for transmitting electric power between opposing coil devices and performs non-contact power feeding from a power transmission side to a power receiving side has attracted attention. The non-contact power supply system employs a magnetic field resonance method or an electromagnetic induction method, and is expected to be applied to power supply of mobile objects such as electric vehicles and hybrid vehicles. However, in this non-contact power supply system, if foreign matter exists in a region through which the magnetic field of the coil device passes, the magnetic field distribution between the coil devices is disturbed, the magnetic flux interlinked with the coil device on the power receiving side is reduced, and the power supply efficiency is lowered. There is a fear.

  In the following Patent Document 1, there is a non-contact power receiving device that includes a cover that covers a coil that receives power supplied from the outside and has one surface related to electromagnetic induction or magnetic resonance, and one or more wipers that wipe the one surface. It is disclosed. According to this non-contact power receiving device, foreign matter that may adversely affect power reception can be removed from the one surface of the coil cover by the operation of the wiper.

JP2013-121209A

  However, the conventional wiper that requires the mechanically movable part has a problem that it deteriorates with age due to wear of the mechanism. In addition, the wiper must be in strong contact with the cover surface in order to remove foreign matter adhering to the cover surface, and the wiper removal surface wears due to contact with the foreign matter or friction with the cover, removing foreign matter. There is a problem that the performance is likely to deteriorate.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a foreign matter removing device that can remove foreign matter without using a wiper, ground-side equipment of a non-contact power feeding system, and a non-contact power feeding system. .

  In order to solve the above-described problem, the present invention provides a foreign matter having a liquid ejecting unit that pushes out a foreign matter existing in a region through which a magnetic field generated by non-contact power feeding using magnetic coupling between coil devices passes. Adopt removal device.

  Moreover, in the foreign material removal apparatus of this invention, the said liquid injection part employ | adopts the structure of ejecting the said liquid, when the said magnetic field has generate | occur | produced.

  In the foreign matter removing apparatus of the present invention, a liquid recovery unit that recovers the liquid ejected from the liquid ejecting unit, and a liquid supply unit that supplies the liquid recovered by the liquid recovery unit to the liquid ejecting unit. The structure of having further, is adopted.

  In the foreign matter removing apparatus of the present invention, a position specifying unit that specifies the position of the foreign matter, and an injection angle adjusting unit that adjusts the jet angle of the liquid according to the specification result of the position specifying unit, The structure of having is adopted.

  Moreover, in the foreign material removal apparatus of this invention, a groove | channel is formed in the area | region of the said coil apparatus which the said foreign material can contact, and the said liquid injection part ejects the said liquid along the said groove | channel. adopt.

  Moreover, in this invention, it is the ground side installation of the non-contact electric power feeding system provided with a coil apparatus, Comprising: The structure called the ground side equipment of the non-contact electric power feeding system provided with the foreign material removal apparatus mentioned above is employ | adopted.

  Moreover, in the ground side installation of the non-contact electric power feeding system of this invention, the said coil apparatus employ | adopts the structure that it has the inclination part inclined in the gravity direction in the area | region which the said foreign material can contact.

  Moreover, in this invention, it is a non-contact electric power feeding system which has the ground side equipment provided with a coil apparatus, and the mobile body provided with the coil apparatus which can oppose the said coil apparatus, Comprising: The said ground side equipment and the said mobile body A configuration is adopted in which at least one of the above-described foreign matter removing devices is provided.

  Moreover, in the non-contact power feeding system of the present invention, the coil device of at least one of the ground side equipment and the moving body has an inclined portion inclined in the direction of gravity in a region where the foreign object can contact, The configuration is adopted.

  Moreover, in the non-contact electric power feeding system of this invention, it has the control part which stops the injection of the said liquid of the said foreign material removal apparatus based on the distance of the said moving body and the said coil apparatus of the said ground side installation. Is adopted.

In the present invention, the foreign matter existing in the region through which the magnetic field of the coil device passes is pushed away by jetting the liquid. The liquid does not wear like a wiper even when it comes into contact with a foreign object, and has a predetermined mass, so that even a relatively heavy foreign object can be easily washed away.
Therefore, in this invention, the foreign material removal apparatus which can remove a foreign material, without using a wiper, the ground side installation of a non-contact electric power feeding system, and a non-contact electric power feeding system are obtained.

It is a whole block diagram of the non-contact electric power feeding system in 1st Embodiment of this invention. It is a block diagram which shows the foreign material removal apparatus in 1st Embodiment of this invention. FIG. 3 is a plan view illustrating an arrangement of liquid ejecting members according to the first embodiment of the present invention. It is a perspective view which shows the foreign material removal apparatus in 2nd Embodiment of this invention. It is a top view which shows the foreign material removal apparatus in 3rd Embodiment of this invention. It is a top view which shows the power transmission side pad in 4th Embodiment of this invention. It is arrow AA sectional drawing in FIG. It is a top view which shows the power transmission side pad which concerns on the modification of 4th Embodiment of this invention. It is sectional drawing which shows the power transmission side pad which concerns on the modification of 4th Embodiment of this invention. It is a block diagram which shows the non-contact electric power feeding system in 5th Embodiment of this invention. It is a block diagram which shows the non-contact electric power feeding system in 6th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is an overall configuration diagram of a non-contact power feeding system 1 according to the first embodiment of the present invention.
The non-contact power supply system 1 performs non-contact power supply between the vehicle 10 (moving body) and the stop station 20 (ground side equipment). In the present embodiment, as illustrated in FIG. 1, the power receiving device is provided in the vehicle 10, and the power transmitting device is provided in the stop station 20 where the vehicle 10 stops. The vehicle 10 is movable with respect to a stop station 20 provided on the road surface 2.

  The vehicle 10 is provided with a power reception side pad 11 (coil device) for power reception. On the other hand, the stop station 20 is provided with a power transmission side pad 21 (coil device) for power transmission. The power receiving side pad 11 is provided at the bottom of the vehicle 10 so as to be opposed to the ground side power transmitting side pad 21. The power receiving side pad 11 has a coil 11 a and receives power in a non-contact manner by being magnetically coupled to the coil 21 a of the power transmitting side pad 21. The power receiving side pad 11 includes a coil 11a and a cover member 11b that covers the coil 11a. Moreover, the power transmission side pad 21 is comprised from the coil 21a and the cover member 21b which covers the coil 21a. The cover members 11b and 21b are made of a non-magnetic and non-conductive material so as not to disturb a magnetic field generated in order to transmit electric power in non-contact power feeding using magnetic coupling between the coils 11a and 21a. The cover members 11b and 21b are preferably made of a nonmagnetic and nonconductive material, but may have magnetic and conductive properties.

  The non-contact power supply from the power transmission side pad 21 to the power reception side pad 11 in the non-contact power supply system 1 of the present embodiment is realized by using magnetic coupling between the power transmission side pad 21 and the power reception side pad 11. This is performed based on a magnetic resonance method or an electromagnetic induction method. For example, a resonance capacitor (not shown) for constituting a resonance circuit is connected to each of the coil 21a and the coil 11a. For example, the capacitance of the resonance capacitor has the same frequency as the resonance frequency of the power transmission side resonance circuit composed of the coil 21a and the resonance capacitor and the resonance frequency of the power reception side resonance circuit composed of the coil 11a and the resonance capacitor. It is set to be.

The vehicle 10 is provided with a power receiving side power conversion circuit 12 and a load 13 in addition to the power receiving side pad 11.
The power receiving side power conversion circuit 12 is a power conversion circuit that converts the received power received by the power receiving side pad 11 from the power transmitting side pad 21 by non-contact power supply into DC power and supplies it to the load 13. That is, the power reception side power conversion circuit 12 supplies a current corresponding to the load 13 to the load 13. In addition, when the load 13 is a direct current input, the power receiving side power conversion circuit 12 may be a rectifier circuit alone or may further include a DC / DC converter. The power receiving side power conversion circuit 12 includes a configuration having an AC / AC exchange function when the load 13 is an AC input, for example, a rectifier circuit, a DC / DC converter, a DC / AC converter, a matrix converter, or the like. It may be a configuration. The converter to be used may be a non-insulating type (such as a chopper) or an insulating type (such as using a transformer).

  The load 13 is a power storage device capable of storing sufficient electric power as a driving power source for the vehicle 10, and is composed of, for example, a lithium ion secondary battery or a nickel hydride secondary battery. The load 13 may be another power storage device (such as a large-capacity capacitor), a resistance use load (such as a heating element or a lighting device), an inductance use load (such as a motor), or the like.

  A heat transfer plate 14 is provided around the power receiving pad 11. The heat transfer plate 14 is disposed on the back side of the power receiving side pad 11 and supports the power receiving side pad 11. Further, a power receiving side power conversion circuit 12 and a load 13 are provided on the heat transfer plate 14, and the heat transfer plate 14 is thermally connected to the power receiving side pad 11, the power receiving side power conversion circuit 12 and the load 13. Has been. The heat transfer plate 14 is formed of a metal material such as aluminum or copper having heat transfer properties, for example.

On the other hand, the power transmission side pad 21 is provided on the road surface 2 so as to face the power reception side pad 11. In addition to the power transmission side pad 21, the stop station 20 is provided with a power transmission side DC / AC conversion circuit 22 and a power transmission side power conversion circuit 23. An external power supply 24 is connected to the power transmission side power conversion circuit 23.
The power transmission side DC / AC conversion circuit 22 is an inverter circuit on the power transmission side, and includes a generally used circuit such as a half-bridge or a full bridge. The DC power from the power-transmission-side power conversion circuit 23 is contactlessly fed. This is converted into AC power corresponding to the resonance frequency and supplied to the coil 21a. As this inverter circuit, for example, the gate of a semiconductor power element such as a power MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or IGBT (Insulated Gate Bipolar Transistor) is driven by a pulse signal, and the period and length of the pulse signal In general, a PWM (Pulse Width Modulation) modulation method is used.

  The power transmission side power conversion circuit 23 is a power conversion circuit that converts power supplied from the external power supply 24 into DC power and supplies the DC power to the power transmission side DC / AC conversion circuit 22. The power transmission side power conversion circuit 23 may have an AC / DC conversion function in the case of AC input. Further, the power transmission side power conversion circuit 23 may be configured to have a PFC (Power Factor Correction) function in the case of AC input. The power transmission side power conversion circuit 23 may have a DC / DC function in the case of DC input. The converter to be used may be a non-insulating type (such as a chopper) or an insulating type (such as using a transformer).

  The external power source 24 is, for example, a commercial power source, a solar battery, wind power generation, or the like, and supplies the power to the power transmission side power conversion circuit 23. When the external power supply 24 is a DC input, the power transmission side power conversion circuit 23 may not be provided, and the DC input may be directly connected to the power transmission side DC / AC conversion circuit 22.

  The non-contact power feeding system 1 includes a foreign matter removing device 30 that removes the foreign matter 100 existing in the region of the power transmission side pad 21 through which a magnetic field generated by the non-contact power feeding passes. The foreign matter removing apparatus 30 of the present embodiment is attached to the stop station 20 that is the ground side equipment of the non-contact power feeding system 1. The region through which the magnetic field generated by non-contact power supply passes is limited only to the region through which the magnetic field actually passes due to the start of non-contact power supply because the power transmission side pad 21 and the power receiving side pad 11 face each other. It is not something. In this region, as shown in a sixth embodiment described later, a magnetic field has not yet been generated before the start of the non-contact power feeding, but when a non-contact power feeding is performed in the future, a magnetic field is not generated. Includes a region through which a magnetic field passes, that is, a region through which a magnetic field can pass.

FIG. 2 is a configuration diagram showing the foreign matter removing apparatus 30 in the first embodiment of the present invention. FIG. 3 is a plan view showing the arrangement of the liquid ejecting members 31 in the first embodiment of the present invention.
As shown in FIG. 2, the foreign matter removing device 30 is configured to push the foreign matter 100 away by jetting the liquid 101. The liquid 101 of the present embodiment is, for example, water from a tap water. Water in waterworks is non-magnetic and has low electrical conductivity, and has little effect on non-contact power feeding. Note that the liquid 101 may have magnetism and conductivity.

As shown in FIG. 2, the foreign matter removing device 30 includes a liquid ejecting member 31, a liquid supply line 32, an electromagnetic valve 33, and a pump 34 as a liquid ejecting unit that ejects the liquid 101.
A liquid ejection port 35 is formed in the liquid ejection member 31. The liquid ejecting member 31 of the present embodiment is a nozzle having a liquid ejecting port 35 formed at the tip. The liquid ejecting member 31 is a component made of a non-magnetic and non-conductive material, for example, a resin molded component so as not to disturb a magnetic field that transmits electric power in non-contact power feeding. The liquid ejecting member 31 is preferably made of a non-magnetic and non-conductive material, but may have magnetism and conductivity.

  The liquid ejecting member 31 is provided on the facing surface 21A among the facing surfaces 11A and 21A where the power receiving side pad 11 and the power transmitting side pad 21 face each other during non-contact power feeding. The liquid ejection port 35 is oriented in a horizontal direction substantially orthogonal to the facing direction (up and down direction in FIG. 2) in which the coils 11a and 21a are opposed to each other during non-contact power feeding. The liquid ejecting member 31 ejects the liquid 101 horizontally from the outside of the facing region 102 where a magnetic field is generated by non-contact power feeding between the coils 11a and 21a, and removes the foreign matter 100 existing on the facing surface 21A through which the magnetic field passes. It is configured to flush away with water pressure.

  As shown in FIG. 3, a plurality of liquid ejecting members 31 are provided on the facing surface 21A. The foreign matter removing apparatus 30 according to the present embodiment is configured to spray the liquid 101 in at least one of a jet shape and a spray shape. For example, the liquid ejection device includes a liquid ejection port 35 that ejects the liquid 101 in a jet shape. It has the member 31a and the liquid ejection member 31b provided with the liquid ejection port 35 which ejects the liquid 101 in the spray form. For example, as shown in FIG. 3, the liquid ejecting members 31a and the liquid ejecting members 31b are alternately arranged along the peripheral edge of the cover member 21b.

  The liquid supply line 32 supplies the liquid 101 to the liquid ejecting member 31, as shown in FIG. The liquid supply line 32 is branched for each liquid ejecting member 31 on the downstream side. An electromagnetic valve 33 is provided in the liquid supply line 32. The electromagnetic valve 33 opens and closes the flow path of the liquid supply line 32. Since the solenoid valve 33 includes metal parts, the solenoid valve 33 is preferably provided outside an area (on or near the power transmission pad 21) where a magnetic field is generated by non-contact power feeding between the coils 11a and 21a.

  Further, the portion of the liquid supply line 32 that enters the area where the magnetic field is generated is formed of a nonmagnetic and nonconductive material such as a resin hose so as not to interfere with the magnetic field that transmits power in the non-contact power feeding. Is preferred. The liquid supply line 32 is connected to the pump 34 on the upstream side. The pump 34 increases the water pressure of the liquid 101 ejected from the liquid ejecting member 31. The pump 34 is connected to, for example, a water supply. Note that the pump 34 may not be provided as long as the water pressure capable of pushing away the foreign material 100 can be secured.

Next, the operation of the non-contact power feeding system 1 configured as described above will be described.
As shown in FIG. 1, the non-contact power supply system 1 performs non-contact power supply between the vehicle 10 and the stop station 20. In such a non-contact power supply system, there is a gap between the power transmission side pad 21 and the power reception side pad 11, and thus the foreign object 100 may enter.

  When the power transmission side pad 21 is installed in the stop station 20 of the ground side facility as in the present embodiment, the foreign matter 100 is placed on the facing surface 21A of the power transmission side pad 21 as shown in FIG. There is. In the non-contact power supply, if the foreign object 100 exists between the power transmission side pad 21 and the power reception side pad 11, the magnetic field distribution may be disturbed and the power supply efficiency may be reduced. For this reason, the non-contact power feeding system 1 includes a foreign matter removing device 30 that removes the foreign matter 100 placed between the power transmitting side pad 21 and the power receiving side pad 11.

  The foreign matter removing device 30 opens the electromagnetic valve 33 and supplies the liquid 101 to the liquid ejecting member 31. The liquid ejection member 31 is provided with a liquid ejection port 35, and the liquid 101 is ejected horizontally from the liquid ejection port 35 along the facing surface 21 </ b> A of the power transmission side pad 21. The liquid 101 is ejected over a wide range from the plurality of liquid ejecting members to the facing surface 21A, and the foreign matter 100 existing in the region through which the magnetic field of the power transmission side pad 21 passes is pushed away with water pressure. The liquid 101 does not wear like a wiper even when it comes into contact with the foreign material 100, and has a predetermined mass, and even the relatively heavy foreign material 100 can be easily washed away. Therefore, the foreign matter removing device 30 has few mechanical moving parts and can suppress deterioration over time. Further, the foreign matter removing device 30 is not worn by contact with the foreign matter 100, and the removal performance of the foreign matter 100 is hardly lowered.

  Moreover, the foreign material removal apparatus 30 sprays the liquid 101 in jet form and spray form. The jet-like liquid 101 has high directivity and can be ejected to a target location and has a high water pressure. The jetting of the jet-like liquid 101 can be suitably used for, for example, washing away a relatively heavy foreign object 100 (such as a can containing the contents). The spray-like liquid 101 is highly diffusible and can be sprayed over a wide range, but the water pressure is low. The spraying of the spray-like liquid 101 can be suitably used for, for example, flushing a relatively light foreign material 100 (silver paper or the like). Since the foreign matter removing apparatus 30 of the present embodiment ejects the jet-like liquid 101 and the spray-like liquid 101 at the same time, it can cover a wide range on the facing surface 21A, and effectively remove the foreign matter 100 having various weights. Can be swept away.

  In the present embodiment, the liquid ejecting member 31 is nonmagnetic and nonconductive. According to this configuration, the liquid ejecting member 31 does not disturb the magnetic field distribution of non-contact power feeding or generate heat due to eddy current (or small if any). Therefore, as shown in FIG. 2, the liquid ejecting member 31 can be provided on the facing surface 21 </ b> A where the coils 11 a and 21 a face each other without reducing the efficiency of non-contact power feeding. In this way, by placing the liquid ejecting member 31 on the opposing surface 21 </ b> A of the power transmission side pad 21, it is possible to save the space for the foreign matter removing device 30.

  In the present embodiment, the coils 11a and 21a are covered with nonmagnetic and nonconductive cover members 11b and 21b. According to this configuration, the cover members 11b and 21b do not disturb the magnetic field distribution of the non-contact power feeding or generate heat due to the eddy current (or small if any). Moreover, even if the liquid 101 adheres by the cover members 11b and 21b, it can be waterproofed so that the liquid 101 does not enter the coils 11a and 21a.

  Moreover, in this embodiment, the foreign material removal apparatus 30 ejects the liquid 101 when the magnetic field for electric power feeding has generate | occur | produced between the coils 11a and 21a. Since the liquid 101 is non-magnetic and low in electrical conductivity and hardly affects the non-contact power feeding, even if the foreign object 100 flies during the non-contact power feeding, the non-contact power feeding is not affected (the power feeding is stopped). The foreign matter 100 can be removed. Moreover, according to this structure, the heat generated in the coil 21a due to the jet of the liquid 101 can also be removed.

  As described above, according to the above-described embodiment, the wiper is used by adopting the foreign matter removing device 30 that pushes the foreign matter 100 existing in the region through which the magnetic field of the power transmission side pad 21 passes by the jet of the liquid 101. Without removing the foreign matter. For this reason, in this embodiment, since there are few mechanical movable parts, aged deterioration can be suppressed and the removal performance of the foreign material 100 can be made difficult to fall.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

FIG. 4 is a perspective view showing the foreign matter removing apparatus 30 in the second embodiment of the present invention.
The foreign matter removing apparatus 30 of the second embodiment includes a liquid ejecting member 31 (liquid ejecting unit) that ejects the liquid 101, a liquid recovery tank 36 (liquid recovering unit) that recovers the liquid 101 ejected from the liquid ejecting member 31, and the like. And a pump 34 (liquid supply unit) for supplying the liquid 101 recovered by the liquid recovery tank 36 to the liquid ejecting member 31.

  A wall portion 37 is provided at a predetermined height on the peripheral portion of the facing surface 21A of the power transmission side pad 21 of the second embodiment. The wall portion 37 is for collecting the liquid 101 ejected from the liquid ejecting member 31 and surrounds the four sides of the facing surface 21A. The liquid ejecting member 31 according to the second embodiment is configured to eject the liquid 101 obliquely with respect to the facing surface 21 </ b> A of the power transmission side pad 21 from above the corner of the wall portion 37. According to this configuration, the liquid 101 can be widely spread on the facing surface 21 </ b> A of the power transmission side pad 21.

  A liquid recovery line 38 is connected on the diagonal line of the liquid ejecting member 31. The liquid recovery line 38 introduces the liquid 101 on the facing surface 21A into the liquid recovery tank 36. One end of the liquid recovery line 38 is connected to the lower corner of the wall 37, and the other end is connected to the upper portion of the liquid recovery tank 36. The liquid recovery tank 36 stores the liquid 101 introduced from the liquid recovery line 38. A foreign substance 100 is also introduced from the liquid recovery line 38 together with the liquid 101.

  A liquid supply line 32 is connected to the lower part of the liquid recovery tank 36. According to this configuration, the foreign matter 100 having a low specific gravity (such as an empty can or silver paper) floats on the liquid surface of the liquid 101, so that only the liquid 101 can be supplied to the pump 34. Note that a filter may be provided at the connection portion of the liquid supply line 32 so that the foreign matter 100 is not supplied to the pump 34. The pump 34 extracts the liquid 101 stored in the liquid recovery tank 36 via the liquid supply line 32, pressurizes it, and conveys it toward the liquid ejecting member 31. When the electromagnetic valve 33 is opened, the pressurized liquid 101 is ejected from the liquid ejecting member 31. Since the liquid ejecting member 31 is installed above the wall portion 37, the momentum at which the liquid 101 from the liquid ejecting member 31 is sprayed on the facing surface 21A depends on the pressurization amount of the pump 34 and the gravity. Since the momentum of the liquid 101 can be realized also by gravity, the amount of pressurization of the pump 34 can be suppressed correspondingly. Thereby, the use load of the pump 34 becomes small and deterioration can be suppressed.

  According to the second embodiment configured as described above, the liquid 101 ejected from the liquid ejecting member 31 is recovered in the liquid recovery tank 36, and the liquid 101 recovered in the liquid recovery tank 36 is again returned from the liquid ejecting member 31 by the pump 34. The liquid 101 can be circulated by being ejected. For this reason, in the second embodiment, the liquid 101 can be reused, which can contribute to saving water resources.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

FIG. 5 is a plan view showing the foreign matter removing apparatus 30 according to the third embodiment of the present invention.
The foreign matter removing apparatus 30 according to the third embodiment includes a position specifying unit 40 that specifies the position of the foreign matter 100 on the power transmission side pad 21 and an injection angle that adjusts the injection angle of the liquid 101 according to the specification result of the position specifying unit 40. And an adjustment unit 41.

  The power transmission side pad 21 of the third embodiment is provided with a plurality of detection coils 21a1 different from the power transmission coil 21a in a matrix. When a magnetic field is generated from the power transmission coil 21a, a magnetic flux is linked to the detection coil 21a1, and a current (inductive current) is generated in the detection coil 21a1. Then, this current value is input to the position specifying unit 40. The position specifying unit 40 can be configured by any suitable processor such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).

  If there is a foreign substance, the magnetic field distribution is disturbed, so the magnitude of the current output from the detection coil 21a1 changes depending on the presence or absence of the foreign substance. Therefore, the position specifying unit 40 can determine the presence / absence of foreign matter from the change in current from the detection coil 21a1 by grasping in advance the current value when there is no foreign matter. Since the change in the magnetic field distribution is greater in the region closer to the foreign matter, the position specifying unit 40 can determine that there is a foreign matter around the detection coil 21a1 that outputs a current with a large amount of change.

  The ejection angle adjustment unit 41 adjusts the direction of the liquid ejection member 31 according to the identification result of the position identification unit 40. The ejection angle adjustment unit 41 includes an angle adjustment actuator using a motor or the like as a drive source, and the liquid ejection member 31 is ejected toward the detection coil 21a1 that is determined by the position specification unit 40 to have a foreign object around it. The horizontal angle is adjusted. In addition, as the liquid ejecting member 31, it is preferable to employ a member that ejects the liquid 101 in a jet shape so that a large water pressure can be applied to a target location.

  According to the third embodiment having the above-described configuration, the position specifying unit 40 specifies the position of the foreign object 100 based on the induced currents of the plurality of detection coils 21a1, and the injection angle adjusting unit 41 is based on the specification result. The direction of 31 can be adjusted, the liquid 101 can be ejected toward the foreign material 100 on the opposing surface 21A, and the foreign material 100 can be pushed away. For this reason, in 3rd Embodiment, the removal precision of the foreign material 100 can be aimed at. In the third embodiment, since the liquid 101 can be applied to the foreign material 100, it can contribute to the saving of water resources.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

FIG. 6 is a plan view showing a power transmission side pad 21 in the fourth embodiment of the present invention. FIG. 7 is a cross-sectional view taken along the line AA in FIG.
The power transmission side pad 21 of the fourth embodiment is a region through which a magnetic field passes, and a groove 50 is formed in a region where foreign matter can contact, and the foreign matter removing device 30 ejects liquid along the groove 50. It has a configuration.

  A groove 50 is formed on the opposing surface 21A of the power transmission side pad 21 of the fourth embodiment. As shown in FIG. 6, a plurality of grooves 50 are formed in parallel. The cross-sectional shape of the groove 50 is substantially V-shaped as shown in FIG. As shown in FIG. 6, the liquid ejecting member 31 of the foreign matter removing apparatus 30 is disposed in each of the grooves 50 and is configured to eject the liquid 101 in the direction in which the grooves 50 extend.

  According to 4th Embodiment of the said structure, an unevenness | corrugation can be formed in 21 A of opposing surfaces through which a magnetic field passes by forming the groove | channel 50 in the power transmission side pad 21. FIG. Thereby, when the foreign material 100 is supported by a convex part, the foreign material 100 will contact in a linear form. In this case, since the contact area between the facing surface 21A and the foreign material 100 can be reduced as compared with the case where the foreign material 100 contacts the opposing surface 21A in a planar shape, even if the foreign material 100 is adhesive, The force with which 100 adheres to the opposing surface 21A is weak and can be easily swept away by the liquid 101. In the fourth embodiment, since the liquid 101 is ejected along the groove 50, the liquid 101 splatters against the surface of the groove 50 rather than ejecting the liquid 101 in a direction intersecting the groove 50. The foreign object 100 can be swept away without killing.

Note that the configuration shown in FIGS. 8 and 9 may be employed as a modification of the fourth embodiment.
In the modification shown in FIG. 8, a plurality of small protrusions 51 (texture surfaces) are provided on the facing surface 21 </ b> A of the power transmission side pad 21. Also with this configuration, the contact area between the foreign object 100 and the facing surface 21A can be reduced.
In the modification shown in FIG. 9, a plurality of raised portions 52 are provided on the facing surface 21 </ b> A of the power transmission side pad 21. Also with this configuration, the contact area between the foreign object 100 and the facing surface 21A can be reduced.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

FIG. 10 is a configuration diagram showing the non-contact power feeding system 1 in the fifth embodiment of the present invention.
The non-contact power feeding system 1 of the fifth embodiment is a region through which the magnetic fields of the power receiving side pad 11 and the power transmitting side pad 21 pass, and has an inclined portion 60 inclined in the direction of gravity in a region where the foreign object 100 can contact.

  The cover member 11b of the power receiving side pad 11 is formed in a mountain shape that protrudes downward. Thereby, the inclined surface 60 inclined in the gravitational direction is formed on the opposing surface 11A of the power receiving side pad 11 from the peripheral portion toward the central portion (with reference to the horizontal direction). On the other hand, the cover member 21b of the power transmission side pad 21 is formed in a mountain shape that protrudes upward. As a result, an inclined portion 60 that is inclined in the direction of gravity from the central portion toward the peripheral portion is formed on the facing surface 21A of the power transmission side pad 21.

  The foreign matter removing apparatus 30 according to the fifth embodiment includes a plurality of liquid ejecting members 31 that eject the liquid 101 toward the peripheral edge of the power receiving side pad 11. The liquid supply line 32 is branched and connected to a plurality of liquid ejecting members 31, and an electromagnetic valve 33 is provided at each of the branched liquid supply lines 32. A drainage groove 25 is formed around the power transmission side pad 21. A drain line 39 is connected to the bottom of the drain groove 25.

  According to the fifth embodiment having the above-described configuration, the liquid 101 is ejected from the plurality of liquid ejecting members 31 toward the peripheral portion of the facing surface 11 </ b> A of the power receiving side pad 11. The liquid 101 sprayed to the peripheral portion of the opposing surface 11A is collected by the inclined portion 60 at the central portion of the opposing surface 11A and flows down to the central portion of the opposing surface 21A of the power transmission side pad 21. The liquid 101 that has flowed down to the center portion of the facing surface 21A is diffused radially to the peripheral portion of the facing surface 21A by the inclined portion 60 and flows down to the drainage groove 25. The liquid 101 that has flowed down into the drainage groove 25 is drained through the drainage line 39.

  In the fifth embodiment, by injecting the liquid 101 toward the peripheral portion of the opposing surface 11A of the power receiving side pad 11, not only the opposing surface 11A of the power receiving side pad 11 through which the magnetic field passes but also the power transmission side through which the magnetic field passes. The liquid 101 can also flow on the facing surface 21 </ b> A of the pad 21. Thereby, the foreign material 100 in contact with each of the opposing surfaces 11A and 21A can be removed. In particular, since the facing surface 11A is convex downward, the liquid 101 sprayed on the facing surface 11A is likely to gather near the center of the facing surface 11A, and the liquid 101 is placed outside the facing surface 21A from the facing surface 11A. It becomes hard to fall. Thereby, the liquid 101 ejected to the facing surface 11A is efficiently used as the foreign matter removing liquid 101 on the facing surface 21A. Furthermore, by forming the inclined portion 60 on the facing surface 21A of the power transmission side pad 21 through which the magnetic field passes, the foreign matter 100 placed on the facing surface 21A can be easily washed off. In addition, according to this configuration, gravity due to the inclination can be used, so that a reduction in the removal performance of the foreign matter 100 can be suppressed even if the spray pressure of the liquid 101 is small.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

FIG. 11 is a configuration diagram showing the non-contact power feeding system 1 in the sixth embodiment of the present invention.
The non-contact power feeding system 1 of the sixth embodiment includes a control unit 70 that stops the ejection of the liquid 101 of the foreign matter removing device 30 based on the distance between the vehicle 10 and the power transmission side pad 21 of the stop station 20. Note that the distance to the vehicle 10 can be measured with reference to the position of the power receiving pad 11 or the tip of the vehicle 10 as a reference, and the distance measurement reference position can be set as appropriate.

  The control unit 70 includes a communication unit that performs wireless communication with the control unit 71 mounted on the vehicle 10, calculates the distance between the vehicle 10 and the power transmission side pad 21 through communication with the control unit 71, and the vehicle 10 transmits power. When approaching the side pad 21, the electromagnetic valve 33 of the foreign matter removing apparatus 30 is closed to stop the ejection of the liquid 101. The control unit 70 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a communication unit, and the like, and is configured to drive the electromagnetic valve 33 based on a predetermined program. .

  The control unit 70 stores in advance the position (coordinates) of the power transmission side pad 21 on the earth. The control unit 71 is connected to a GPS (Global Positioning System) antenna (not shown) mounted on the vehicle 10, acquires the position (coordinates) of the vehicle 10 on the earth, and controls the position of the vehicle 10. 70. The control unit 71 includes a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), a communication unit, and the like. The controller 70 is programmed to close the electromagnetic valve 33 when the distance between the vehicle 10 and the power transmission side pad 21 is equal to or less than a predetermined threshold (for example, the distance that the liquid 101 is applied to the vehicle 10).

  According to the sixth embodiment having the above-described configuration, the vehicle 10 desired to receive power supply is connected to the power transmission side pad 21 by communication between the control unit 70 provided on the stop station 20 side and the control unit 71 provided on the vehicle 10. Before approaching, the ejection of the liquid 101 by the foreign material removing device 30 is started and the foreign material 100 is removed. Then, the control unit 70 stops the ejection of the liquid 101 by the foreign substance removing device 30 before the vehicle 10 enters the predetermined distance from the power transmission side pad 21 so that the liquid 101 is not applied to the vehicle 10. For this reason, in the sixth embodiment, it is possible to prevent the foreign matter 100 blown off by the liquid 101 and water pressure from adhering to the vehicle 10. Further, even when there is a living thing on the power transmission side pad 21, it can be released by jetting the liquid 101 before the vehicle 10 approaches.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the second embodiment, the recovery efficiency of the liquid 101 can be improved by providing a height difference in the cover member 21b and making the position where the liquid recovery line 38 is connected the lowest.

  In addition, for example, in the second embodiment, when the liquid recovery tank 36 is disposed outdoors, the upper part of the liquid recovery tank 36 is opened to collect rainwater, etc. Usability can be improved even in places where there is not.

  Further, for example, in the third embodiment, it has been described that the position of the foreign object 100 is specified based on the induced currents from the plurality of detection coils 21a1, but the position specifying unit 40 is, for example, the facing surface 21A of the power transmission side pad 21. Alternatively, a plurality of weight sensors (such as strain sensors) may be laid and the position of the foreign object 100 may be specified based on the weight.

  For example, in the sixth embodiment, the liquid 101 is not applied to the vehicle 10, but the liquid 101 may not be applied to a living body such as a person or an animal. For example, a living body detection means such as a camera, a smart entry key, and a sensor (light / sound wave) is provided at the stop station 20, and after confirming that the living body does not exist around the power transmission side pad 21, the liquid 101 is injected. A configuration for starting the process may be adopted.

  Further, for example, in the above embodiment, water supplied from the water supply is exemplified as the liquid 101, but the system is installed in a cold district regardless of the type of refrigerant as long as it is non-magnetic and low in conductivity. In such a case, for example, an antifreeze such as ethylene glycol, a mixture of water with an antifreeze, or a low freezing point such as oil may be used. In the case of using a refrigerant other than water, in the second embodiment, if the collected liquid is not drained and dust or the like is removed through a filter and used again as a liquid, the liquid 101 is effectively used. Can do.

  For example, in the above-described embodiment, power is supplied from the stop station 20 on the ground side to supply power to the bottom of the vehicle 10, but the direction of power supply is not limited. For example, power may be supplied from the wall to the side portion, front portion, or rear portion of the vehicle 10, or the roof portion of the vehicle 10 may be supplied from the ceiling.

  Further, for example, in the above-described embodiment, the case where the power receiving device is installed in the vehicle 10 and the power transmitting device is installed in the stop station 20 is illustrated, but the present invention is not limited to this configuration. The power transmission device may be installed in the vehicle 10.

  Moreover, in the said embodiment, although the case where the power transmission side pad 21 was provided on the road surface 2 was illustrated, this invention is not limited to this structure. For example, the power transmission side pad 21 may be embedded so that the opposing surface 21A is flush with the ground surface, or may be embedded so that the opposing surface 21A is completely hidden in the ground.

  Further, for example, the replacement and combination of the configurations of the above embodiments can be appropriately performed.

  DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power feeding system, 10 ... Vehicle (moving body), 11 ... Power receiving side pad (coil apparatus), 11a ... Coil, 11A ... Opposite surface, 20 ... Stop station (ground side equipment), 21 ... Power transmission side pad ( Coil device), 21a ... coil, 21A ... opposing surface, 30 ... foreign matter removing device, 31 ... liquid ejecting member (liquid ejecting portion), 32 ... liquid supply line (liquid ejecting portion), 33 ... solenoid valve (liquid ejecting portion) 34 ... Pump (liquid ejecting unit, liquid supply unit) 36 ... Liquid recovery tank (liquid collecting unit), 40 ... Position specifying unit, 41 ... Ejecting angle adjusting unit, 50 ... Groove, 60 ... Inclining unit, 70 ... Control Part, 100 ... foreign matter, 101 ... liquid, 102 ... opposite area

Claims (10)

  A foreign matter removing apparatus having a liquid ejecting unit that pushes out foreign matter existing in a region through which a magnetic field generated by non-contact power feeding using magnetic coupling between coil devices passes.   The foreign matter removing apparatus according to claim 1, wherein the liquid ejecting unit ejects the liquid when the magnetic field is generated. A liquid recovery unit that recovers the liquid ejected from the liquid ejection unit;
The foreign matter removing apparatus according to claim 1, further comprising: a liquid supply unit that supplies the liquid recovered by the liquid recovery unit to the liquid ejecting unit. A position specifying unit for specifying the position of the foreign substance;
The foreign matter removing apparatus according to any one of claims 1 to 3, further comprising: an ejection angle adjusting unit that adjusts an ejection angle of the liquid according to a specification result of the position specifying unit. A groove is formed in the region of the coil device where the foreign matter can contact,
The foreign matter removing apparatus according to claim 1, wherein the liquid ejecting unit ejects the liquid along the groove. A ground-side facility of a non-contact power feeding system including a coil device,
Ground side equipment of a non-contact electric supply system provided with the foreign substance removal device according to any one of claims 1 to 5.   The said coil apparatus is the ground side installation of the non-contact electric power feeding system of Claim 6 which has the inclination part which inclined in the gravitational direction in the area | region which the said foreign material can contact. A non-contact power feeding system having a ground side facility including a coil device and a moving body including a coil device capable of facing the coil device,
A non-contact power feeding system in which at least one of the ground side equipment and the moving body includes the foreign matter removing device according to any one of claims 1 to 5.   The non-contact power feeding system according to claim 8, wherein the coil device of at least one of the ground-side facility and the moving body has an inclined portion inclined in the direction of gravity in a region where the foreign object can contact.   The non-contact electric power feeding system according to claim 8 or 9 which has a control part which stops jetting of said liquid of said foreign substance removal device based on the distance of said mobile body and said coil device of said ground side equipment.

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