JP6375934B2 - Wireless power transmission system - Google Patents

Description

  The present invention relates to a wireless power transmission system.

  In recent years, EVs (Electric Vehicles), HEVs (Hybrid Electric Vehicles), and PHEVs (Plug-in Hybrid Electric Vehicles) are becoming popular as environmentally friendly vehicles. As a means for charging these vehicles, a wireless power transmission technique for supplying power wirelessly without using a conventional plug or power cable has attracted attention.

  In such wireless power transmission technology, power is supplied with the power supply unit arranged on the ground facing the power reception unit mounted on the car. However, if the positional deviation between the power supply unit and the power reception unit is large, the power transmission efficiency Therefore, there is an increasing demand for a technique for supplying power only when the moving body is stopped at a position where good power transmission efficiency can be obtained.

  In response to such a request, Patent Document 1 proposes a technique that uses a reflector and a sensor to quickly stop power supply when the moving body is not stopped at an appropriate position where good power transmission efficiency can be obtained. Has been.

JP 2014-79029 A

  However, the technique disclosed in Patent Document 1 has a problem that the configuration is complicated because an instruction to stop power supply from the power receiving side is performed by communication. In addition, if power transmission is continued after the car is fully charged, wasteful power consumption will occur.Therefore, there is an increasing demand for technology to promptly stop power supply and stop power supply from the power receiving side. In regard to the point, Patent Document 1 does not consider anything and still remains a problem.

  Furthermore, in recent years, in order to improve the operation rate of cars, technology that wirelessly transmits electric power while driving and charges the car is attracting attention. It was necessary to provide many communication base stations, and there was a problem that led to high costs.

  Accordingly, the present invention has been made in view of the above problems, and provides a wireless power transmission system that can turn on / off a power feeding operation at a desired timing with a low cost and a simple configuration while suppressing wasteful power consumption. The purpose is to provide.

  As a result of intensive studies by the present inventors, in order to achieve the above-described object, a desired timing can be achieved with a low cost and a simple configuration while suppressing wasteful power consumption by the operation of the reflector mounted on the power receiving device. Since it was found that the power feeding operation can be turned ON / OFF, the following technical means have been adopted.

  A wireless power transmission system according to the present invention is a wireless power transmission system that wirelessly transmits power from a power feeding device to a power receiving device, wherein the power feeding device is disposed on the ground and generates an AC magnetic field using power from a power source. A coil, a light projecting unit that outputs light, a light sensor unit that includes a light receiving unit that detects light, and a power feeding control unit that starts supplying power to the power feeding coil when the light receiving unit detects light. The apparatus includes a power receiving coil that receives power from the power feeding coil via an alternating magnetic field, a load that consumes or stores power charged by the power receiving coil, a reflector that reflects light from the light projecting unit to the power receiving unit, A reflection plate control unit that controls the light reflection function of the plate, and the reflection plate control unit stops the reflection function of the reflection plate to the light receiving unit when the power reception side rejects power reception.

  According to the present invention, the power feeding device includes power feeding control for starting power supply to the power feeding coil when the light receiving unit detects light, and the power receiving device reflects the light from the light projecting unit to the light receiving unit; The reflection plate control unit that controls the light reflection function of the reflection plate is provided, and the reflection plate control unit stops the reflection function of the reflection plate to the light receiving unit when the power receiving side rejects the power reception. Therefore, the power feeding operation is performed only when the power feeding coil and the power receiving coil are in a position where good power transmission efficiency can be obtained, and the power feeding operation can be stopped when there is a request for power reception rejection on the power receiving side. Therefore, the power feeding operation can be turned on / off at a desired timing while suppressing unnecessary power consumption.

  Further, in the wireless power transmission system according to the present invention, the reflector control unit stops the reflection function to the light receiving unit of the reflector when the load rejects power reception, and therefore communication between the power feeding side and the power receiving side. The power feeding operation can be controlled without performing the above. As a result, the power feeding operation can be turned on / off at a desired timing with a low-cost and simple configuration.

  Preferably, the reflecting plate may be set to a size of a power supply permission range of the power feeding coil and the power receiving coil. In this case, if the relative positional relationship between the power feeding coil and the power receiving coil is not within the power feeding permission range, the light output from the light projecting unit cannot be detected by the light receiving unit, and therefore the relative positional relationship between the power feeding coil and the power receiving coil. Can be stopped when the power supply is out of the power supply permission range. Therefore, wasteful power consumption can be further suppressed.

  Preferably, the power receiving device further includes a load voltage detection unit that detects a voltage value of the load, wherein the load includes a power storage unit that stores electric power, and the load voltage detection unit has a detected voltage value exceeding a predetermined threshold value. In this case, the reflection operation unit may be notified that the power reception is rejected. In this case, since the load voltage detection unit detects an excessive increase in current and voltage due to a decrease in the power load after the charging of the power storage unit is completed and notifies the reflection operation unit that power reception is rejected, the charging of the power storage unit Unnecessary power supply operation after completion can be prevented. Therefore, wasteful power consumption can be further suppressed.

  Preferably, the power reception device further includes a voltage detection unit that detects a voltage value of the power system from the power reception coil to the load, and a current detection unit that detects a current value of the power system from the power reception coil to the load, and the voltage detection unit When the detected voltage value exceeds a predetermined threshold value, the reflector control unit is notified that the power reception is rejected. When the detected current value exceeds the predetermined threshold value, the reflector control unit It is good to notify the department that the power reception is rejected. In this case, the voltage detection unit and the current detection unit detect an abnormality in the power receiving device, detect an increase in voltage and current in the power system from the power receiving coil to the load, and notify the reflector control unit that power reception is rejected. Therefore, it is possible to stop the power feeding operation when an abnormality occurs in the power receiving device. Therefore, wasteful power consumption can be further suppressed, and the load on the apparatus can be suppressed.

  Preferably, the power receiving device further includes a temperature detecting unit that detects a temperature of the power receiving coil and a temperature of the power system connection unit from the power receiving coil to the load, and the temperature detecting unit has detected the temperature exceeding a predetermined threshold value. At this time, it may be notified to the reflector operating unit that the power reception is rejected. In this case, the temperature detection unit detects an abnormality in the power receiving device, detects a temperature rise in the power receiving coil and the power system connection from the power receiving coil to the load, and notifies the reflector control unit that power reception is rejected. Therefore, the power feeding operation when an abnormality occurs in the power receiving device can be stopped. Therefore, wasteful power consumption can be further suppressed, and the load on the apparatus can be suppressed.

  Preferably, the power reception device further includes a footrest detection unit that is mounted on the moving body and detects presence / absence of an occupant's foot at a predetermined footrest position of the moving body, and the footrest detection unit does not detect the foot of the occupant. At this time, the reflector control unit may be notified that the power reception is rejected. In this case, since the footrest detection unit notifies the reflector control unit that the power reception is rejected when the occupant's foot is not in the proper position, the influence of leakage magnetic flux generated during wireless power transmission on the occupant Can be prevented.

  Preferably, the reflecting plate control unit is configured by a reversing shaft portion that rotatably supports the reflecting plate, and a reversing actuator that controls the rotation operation of the reversing shaft portion. In this case, ON / OFF control of the power feeding operation can be realized with a simple configuration.

  Preferably, the reflection plate control unit may include an antireflection plate that can move between a position that overlaps with a position that does not overlap the reflection plate, and a movement actuator that controls the operation of the reflection prevention plate. In this case, ON / OFF control of the power feeding operation can be realized with a simple configuration.

  More preferably, the antireflection plate may further include a sweeping unit that wipes the surface of the reflection plate on the surface facing the reflection plate. In this case, dirt on the surface of the reflection plate can be removed along with the movement of the antireflection plate. Therefore, the reflecting function of the reflector is ensured, and malfunction can be prevented.

  Preferably, the power receiving device is mounted on a moving body, and the power feeding device includes a power feeding area including a power feeding coil, and a moving body detecting unit that detects entry and detachment of the moving body to and from the power feeding area. When the moving body detection unit detects the entry of the moving body, it starts outputting light from the light projecting unit, and when the moving body detection unit detects the separation of the moving body, it stops outputting light from the light projecting unit. Good. In this case, since the optical sensor unit is driven only when the moving body is present in the power feeding area, it is possible to further reduce power consumption.

  Preferably, the optical sensor unit may include an openable / closable cover unit that covers surfaces of the light projecting unit and the light receiving unit. In this case, it is possible to prevent dirt from adhering to the surfaces of the light projecting unit and the light receiving unit of the optical sensor unit, thereby preventing malfunction.

  Preferably, the light projecting unit may emit light intermittently. In this case, malfunction of the light receiving unit due to light received from the external environment is suppressed.

  According to the present invention, it is possible to provide a wireless power transmission system capable of turning on / off a power feeding operation at a desired timing with a low cost and a simple configuration while suppressing wasteful power consumption.

1 is a schematic diagram showing a wireless power transmission system according to a first embodiment of the present invention. It is the model block diagram which expanded the feed coil part of the wireless power transmission system which concerns on 1st Embodiment of this invention. It is the model block diagram which expanded the receiving coil part of the wireless power transmission system which concerns on 1st Embodiment of this invention. It is the model block diagram which expanded the optical sensor part of the wireless power transmission system which concerns on 1st Embodiment of this invention, a reflecting plate, and a reflecting plate operation | movement part. It is a schematic block diagram which shows the case where a reflecting plate is made to incline. It is a schematic block diagram which shows the case where a reflecting plate is rotated 90 degrees. It is a schematic block diagram which shows the case where a reflecting plate is reversed. It is a schematic diagram of the wireless power transmission system which concerns on 2nd Embodiment of this invention. It is a schematic diagram of the wireless power transmission system which concerns on 3rd Embodiment of this invention. It is a schematic diagram of the wireless power transmission system which concerns on 4th Embodiment of this invention. It is the schematic block diagram which expanded the optical sensor part of the wireless power transmission system which concerns on 5th Embodiment of this invention, a reflecting plate, and a reflecting plate action | operation part. It is the model block diagram which showed the time of opening operation | movement of an antireflection plate. It is the model block diagram which showed the time of closing operation of an antireflection plate. It is the model block diagram which showed the time of opening operation | movement of an antireflection plate in case an antireflection plate is provided with the sweep-out part. It is the model block diagram which showed the time of closing operation of an anti-reflective plate in case an anti-reflective plate is provided with the sweep-out part. It is the schematic diagram which expanded the electric power feeder of the wireless power transmission system which concerns on 6th Embodiment of this invention. It is the schematic diagram which showed when a mobile body entered the electric power feeding area. It is the schematic diagram which showed when a mobile body detaches | leaves from an electric power feeding area. It is a block diagram of the wireless power transmission system which concerns on 7th Embodiment of this invention. It is the schematic block diagram which expanded the optical sensor part (cover part opening) of the wireless power transmission system which concerns on 7th Embodiment of this invention. It is the schematic block diagram which expanded the optical sensor part (cover part closed) of the wireless power transmission system which concerns on 7th Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

(First embodiment)
First, with reference to FIGS. 1-4, the structure of the wireless power transmission system 10 which concerns on 1st Embodiment of this invention is demonstrated. FIG. 1 is a schematic diagram showing a wireless power transmission system according to a first embodiment of the present invention. FIG. 2 is an enlarged schematic configuration diagram of the feeding coil unit of the wireless power transmission system according to the first embodiment of the present invention. FIG. 3 is an enlarged schematic configuration diagram of the power receiving coil unit of the wireless power transmission system according to the first embodiment of the present invention. FIG. 4 is an enlarged schematic configuration diagram of the optical sensor unit, the reflection plate, and the reflection plate operation unit of the wireless power transmission system according to the first embodiment of the present invention.

  As illustrated in FIG. 1, the wireless power transmission system 10 includes a power feeding device 100 and a power receiving device 200. In the present embodiment, the wireless power transmission system 10 will be described using an example in which the wireless power transmission system 10 is applied to a power supply facility for a moving object. That is, the power supply apparatus 100 is mounted on a power supply facility disposed on the ground, and the power reception apparatus 200 is mounted on a moving body.

  The power supply apparatus 100 includes a power source 110, an inverter 120, a power supply coil unit 130, an optical sensor unit 140, and a power supply control unit 150. The power supply device 100 is disposed on the ground.

  The power source 110 supplies DC power to an inverter 120 described later. The power source 110 is not particularly limited as long as it outputs DC power, and is a DC power source obtained by rectifying and smoothing a commercial AC power source, a secondary battery, a DC power source generated by photovoltaic power, or a switching power source device such as a switching converter. Is mentioned.

  The inverter 120 has a function of converting DC power supplied from the power source 110 into AC power. In the present embodiment, the inverter 120 converts the DC power supplied from the power source 110 into AC power and supplies the AC power to a power feeding coil unit described later. The inverter 120 includes a switching circuit in which a plurality of switching elements (not shown) are bridge-connected. Examples of the switching element constituting the switching circuit include a MOS-FET (Metal Oxide Semiconductor-Field Effect Transistor) and an IGBT (Insulated Gate Bipolar Transistor).

  The power feeding coil unit 130 has a function of feeding AC power supplied from the inverter 120 to a power receiving coil unit 210 described later. As in the present embodiment, when the wireless power transmission system 10 is applied to a power supply facility for a moving body, the power supply coil unit 130 is disposed in the ground or in the vicinity of the ground. As shown in FIG. 2, the power supply coil unit 130 includes a power supply coil 131, a magnetic body 132, and a power supply side resonance capacitor 133, and the power supply coil 131 and the magnetic body 132 have an insulating body 134. Is packaged by.

  The power feeding coil 131 receives electric power from the power source 110 and generates an alternating magnetic field. Specifically, when an AC voltage having a predetermined driving frequency is supplied from the inverter 120, the feeding coil 131 generates an AC magnetic field by flowing an AC current. The power supply coil 131 is formed by winding a litz wire such as copper or aluminum. Examples of the shape include a planar coil and a solenoid coil. Note that the number of turns of the feeding coil 131 is appropriately set based on a desired power transmission efficiency.

  The magnetic body 132 has an action of reducing the magnetic resistance of the magnetic path and increasing the magnetic coupling between the coils. That is, the magnetic body 132 fulfills a function for the feeding coil 131 to efficiently generate a magnetic field. When the power feeding coil 131 is configured by a planar coil, the magnetic body 132 is installed on the back side of the power feeding coil 131 opposite to the surface facing the power receiving coil 211 of the power feeding coil 131, and has a plate shape or a rod shape. Consists of magnetic materials. At this time, an insulating sheet may be provided between the magnetic body 132 and the feeding coil 131. On the other hand, when the power supply coil 131 is configured by a solenoid coil, the magnetic body 132 is installed so as to penetrate the coil axis of the solenoid coil and functions as a core. At this time, the magnetic body 132 may be inserted into a hollow insulating bobbin, and the conducting wire of the power receiving coil 211 may be wound around the outer surface of the insulating bobbin. Examples of the magnetic body 132 include ferrite having a relatively high magnetic permeability.

  The power supply side resonance capacitor 133 is connected to the power supply coil 131 and forms a power supply side LC resonance circuit together with the power supply coil 131. The power supply side resonance capacitor 133 has a function of adjusting the resonance frequency of the power supply side LC resonance circuit. The power supply side resonance capacitor 133 may be connected in series to the power supply coil 131, may be connected in parallel, or may be connected in series-parallel. By configuring the resonance frequency of the power supply side LC resonance circuit to be substantially equal to the resonance frequency of the power reception side LC resonance circuit, which will be described later, it is possible to realize highly efficient magnetic field resonance wireless power transmission.

  The optical sensor unit 140 includes a reflection type optical sensor, and includes a light projecting unit 141 that outputs light and a light receiving unit 142 that detects light. Specifically, the optical sensor unit 140 outputs light from the light projecting unit 141 toward the power receiving device 200 described later, and the reflected light reflected by the power receiving device 200 described later is detected by the light receiving unit 142. The optical sensor unit 140 is connected to a power supply control unit 150 (to be described later), and outputs whether or not the light receiving unit 142 receives light. Here, the light projecting unit may intermittently emit the output light. Specifically, the optical sensor unit 140 causes the light output from the light projecting unit 141 to intermittently emit light at a predetermined light projecting frequency using an optical sensor control unit (not shown), and the light receiving unit 142 detects the light to be detected. Only when it matches the light projection frequency of the light output from the light projecting unit 141, it may be configured to output that the light receiving unit 142 has detected light to the power supply control unit 150 described later. Thus, malfunction of the light receiving unit 142 due to light received from the external environment is suppressed. The light projecting unit 141 of the optical sensor unit 140 uses laser light or infrared rays as a light source, and the light receiving unit 142 of the optical sensor unit 140 uses an optical semiconductor such as a photo reflector.

  The power supply control unit 150 has a function of controlling the power supply operation of the inverter 120. Specifically, the power supply control unit 150 controls the switching operation of the switching elements that constitute the inverter 120. In the present embodiment, when the light receiving unit 142 of the optical sensor unit 140 detects light, the power supply control unit 150 drives the inverter 120 to start supplying power to the power supply coil 131 (power supply operation ON). Further, when the power feeding operation of the inverter 120 is being driven, that is, during the power transmission from the power feeding device 100 to the power receiving device 200, the power feeding control unit 150 detects that the light receiving unit 142 of the optical sensor unit 140 does not detect light. The power supply operation is controlled to stop (power supply operation OFF). That is, the power supply control unit 150 supplies power to the power supply coil 131 only when the light output from the light projecting unit 141 of the optical sensor unit 140 is received by the light receiving unit 142 of the optical sensor unit 140. Will be done.

  The power receiving device 200 includes a power receiving coil unit 210, a load 220, a load voltage detection unit 230, a reflection plate 240, and a reflection plate control unit 250. The power receiving device 200 is mounted on a moving body. Here, examples of the mobile body on which the power receiving device 200 is mounted include vehicles such as an electric vehicle (EV) and a hybrid vehicle (HV). The vehicle includes a vehicle body including a seat space where a driver and an occupant sit, a space where the power receiving device 200 is mounted, left and right front wheels suspended on the front lower part of the vehicle body, and left and right front wheels suspended on the rear lower part of the vehicle body. The left and right front wheels are rotatably supported by a front wheel shaft that passes through the approximate center of the wheel, and the left and right rear wheels are rotatably supported by a rear wheel shaft that passes through the approximate center of the wheel. Yes. Then, when these wheels rotate, a propulsive force is generated in the vehicle, and the vehicle can move in a predetermined traveling direction. Note that examples of the vehicle on which the power receiving device 200 is mounted include not only an electric vehicle and a hybrid vehicle, but also a traveling vehicle or a mobile robot that transports articles or the like in a factory. In the present embodiment, the wireless power transmission system 10 is applied to a power supply facility for a moving body. However, the present invention is not limited to this. For example, the wireless power transmission system 10 does not have wheels and is driven by external driving means. When applied to a power supply facility for a moving elevator, the power receiving device 200 is mounted on the elevator car.

  The power receiving coil unit 210 has a function of receiving AC power supplied from the power supply apparatus 100. When the wireless power transmission system 10 is applied to a power supply facility for a moving object as in the present embodiment, the power receiving coil unit 210 is mounted on the lower part of the moving object. As illustrated in FIG. 3, the power receiving coil unit 210 includes a power receiving coil 211, a magnetic body 212, and a power receiving side resonance capacitor 213, and the power receiving coil 211 and the magnetic body 212 have insulating properties. 214 is packaged.

  The power receiving coil 211 receives power from the power feeding coil 131 via an alternating magnetic field generated by the power feeding coil 131. Specifically, the power receiving coil 211 generates an electromotive force due to an electromagnetic induction action due to the alternating magnetic field generated by the power feeding coil 131, and an alternating current based on the electromotive force flows. The alternating current generated in the power receiving coil 211 is supplied to a load 220 described later. The power receiving coil 211 is formed by winding a litz wire such as copper or aluminum. Examples of the shape include a planar coil and a solenoid coil. Note that the number of turns of the power receiving coil 211 is appropriately set based on a desired power transmission efficiency.

  The magnetic body 212 has a function of reducing the magnetic resistance of the magnetic path and increasing the magnetic coupling between the coils. That is, the magnetic body 212 functions to efficiently concentrate the alternating magnetic field generated by the power feeding coil 131 on the power receiving coil 211. When the power receiving coil 211 is a planar coil, the magnetic body 212 is installed on the back side opposite to the surface facing the power feeding side coil of the power receiving coil 211 and is made of a plate-like or rod-like magnetic material. Composed. At this time, an insulating sheet may be provided between the magnetic body 212 and the power receiving coil 211. On the other hand, when the power receiving coil 211 is configured by a solenoid coil, the magnetic body 212 is installed so as to penetrate the coil axis of the solenoid coil and functions as a core. At this time, the magnetic body 212 may be inserted into a hollow insulating bobbin, and the conducting wire of the power receiving coil 211 may be wound around the outer surface of the insulating bobbin. Examples of the magnetic body 212 include ferrite having a relatively high magnetic permeability.

  The power reception side resonance capacitor 213 is connected to the power reception coil 211 and forms a power reception side LC resonance circuit together with the power reception coil 211. The power reception side resonance capacitor 213 has a function of adjusting the resonance frequency of the power reception side LC resonance circuit. The power receiving side resonance capacitor 213 may be connected in series to the power receiving coil 211, may be connected in parallel, or may be connected in series-parallel. Then, by configuring the resonance frequency of the power receiving side LC resonance circuit to be substantially equal to the resonance frequency of the power supply side LC resonance circuit, it is possible to realize highly efficient magnetic resonance wireless power transmission.

  The load 220 consumes or stores the power received by the power receiving coil 211. In the present embodiment, the load 220 includes a rectifying unit 221, a charging unit 222, a power storage unit 223, and a motor unit 224.

  The rectifying unit 221 rectifies the AC power received by the power receiving coil 211 into DC power, and outputs the DC power to the charging unit 222 described later. Examples of the elements constituting the rectifying unit 221 include semiconductor elements such as transistors and diodes. For example, a bridge type circuit in which a plurality of diodes are bridge-connected and a smoothing capacitor connected in parallel to the bridge type circuit and smoothing the rectified voltage to generate a DC voltage.

  The charging unit 222 converts the voltage of the DC power rectified by the rectifying unit 221 into a voltage for charging the power storage unit 223 described later. Specifically, charging is controlled so as to perform constant current and constant voltage charging (CCCV charging) for a power storage unit 223 described later. That is, it includes a constant current charging process for supplying a constant charging current to a power storage unit 223, which will be described later, and a constant voltage charging process for controlling the charging current so that the voltage of a capacitor 223, which will be described later, becomes constant after constant current charging. Thus, charging in a two-stage method for controlling charging is performed. An example of the charging unit 222 is a DC / DC converter. In the present embodiment, the configuration in which the load 220 includes the charging unit 222 has been described. However, the present invention is not limited to this, and after the power received by the power receiving coil 211 is rectified by the rectifying unit 221, the charging unit 222 is not used. You may comprise so that it may supply directly to the electrical storage part 223 mentioned later.

  The power storage unit 223 is not particularly limited as long as it can be repeatedly charged, and examples thereof include a lithium ion secondary battery and a nickel hydride secondary battery. In addition, the power storage unit 223 may be an electric double-layer capacitor (EDLC) having a high power storage amount, temporarily stores electric power, and supplies the stored electric power to a motor unit 224 described later. Or what is necessary is just to function as an electric power buffer which can be supplied to another vehicle control part.

  The motor unit 224 is connected to the power storage unit 223. Specifically, the motor unit 224 includes a motor (not shown) and a motor drive circuit (not shown). Power is supplied from the power storage unit 223 to the motor drive circuit, and the motor drive circuit drives the motor. The wheels of the vehicle are rotated as the motor rotates. Thereby, a driving force is generated in the vehicle, and the vehicle can move in a predetermined traveling direction. Here, all the wheels installed on the vehicle body may be rotated by a motor, or an in-wheel motor incorporating a motor for each wheel may be used.

  The load voltage detection unit 230 detects the voltage value of the load 220. Specifically, the load voltage detection unit 230 detects the terminal voltage of the power storage unit 223. By reading the voltage value detected by the load voltage detection unit 230, the state of charge of the power storage unit 223 can be confirmed. Further, the load voltage detection unit 230 compares the detected voltage value with a predetermined threshold value, and when the detected voltage value exceeds the predetermined threshold value, transmits an output signal to the reflector control unit 250 described later. Examples of such a load voltage detection unit 230 include a voltage dividing circuit and a voltage detection current transformer. The predetermined threshold is appropriately set according to the timing at which the power receiving side wants to reject power reception. That is, the load voltage detection unit 230 plays a role of notifying the later-described reflector control unit 250 that the power reception side is a power rejection. Here, when the power storage unit 223 is charged by the constant current constant voltage charging method, the terminal voltage of the power storage unit 223 increases as the charging progresses, and when the power storage unit 223 is nearly fully charged, the charging current decreases and the power storage unit The terminal voltage of 223 becomes a constant voltage. When the charging of the power storage unit 223 is completed, an excessive increase in current / voltage occurs due to a reduction in power load. That is, in the present embodiment, when the predetermined threshold value of the load voltage detection unit 230 is set to the allowable upper limit value of the voltage that increases due to the power load reduction, it is possible to reject power reception after the charging of the power storage unit 223 is completed.

  The reflection plate 240 has a function of reflecting light output from the light projecting unit 141 of the optical sensor unit 140 to the light receiving unit 142. In the present embodiment, as shown in FIG. 4, the reflecting plate 240 has a rectangular parallelepiped shape and is installed in the lower part of the vehicle. The reflection plate 240 is installed at a position where the light output from the light projecting unit 141 of the optical sensor unit 140 can be reflected by the light receiving unit 142 when the power feeding coil 131 and the power receiving coil 211 face each other. The size of the reflector 240 is set to the size of the power supply permission range of the power supply coil 131 and the power reception coil 211. Here, the power supply permission range of the power supply coil 131 and the power reception coil 211 is a range in which the relative positional relationship between the power supply coil 131 and the power reception coil 211 is allowable. That is, the reflecting plate 240 is projected when the light sensor 131 and the power receiving coil 211 face each other and when the relative positional relationship between the power feeding coil 131 and the power receiving coil 211 is within an allowable range. The light output from the light unit 141 can be reflected by the light receiving unit 142. As a result, when the relative positional relationship between the power feeding coil 131 and the power receiving coil 211 is not within the power feeding permission range, the light output from the light projecting unit 141 cannot be detected by the light receiving unit 142. The power supply operation when the relative positional relationship 211 is outside the power supply permission range can be stopped. Therefore, wasteful power consumption can be further suppressed.

  The reflector control unit 250 has a function of controlling the light reflection function of the reflector 240. Specifically, the reflecting plate control unit 250 stops the reflecting function of the reflecting plate 240 to the light receiving unit 142 when the power receiving side is a power rejection. In the present embodiment, the reflection plate control unit 250 includes an inversion shaft portion 251 and an inversion actuator 252.

  As shown in FIG. 4, the inversion shaft portion 251 is installed on the back surface side opposite to the surface facing the optical sensor portion 140 of the reflection plate 240, and supports the reflection plate 240 rotatably. In the present embodiment, the reversing shaft portion 251 passes through the center of the reflecting plate 240 and extends from one short side of the reflecting plate 240 to the other short side, and the shaft 253 is connected to the reflecting plate 240. It is comprised from the cover 254 fixed to a back surface.

  The reversing actuator 252 has a function of controlling the rotation operation of the reversing shaft portion 251. In the present embodiment, as shown in FIG. 4, the reversing actuator 252 is connected to one end of the shaft 253 of the reversing shaft portion 251 so that the shaft 253 can rotate. An example of the reversing actuator 252 is a rotary actuator that operates with DC power. The reflector control unit 250 configured as described above receives the output signal from the load voltage detection unit 230, and when the power reception side determines that the power reception is rejected, the reflection plate 240 is the light projecting unit of the optical sensor unit 140. The reversing actuator 252 is driven and the reversing shaft portion 251 is rotated so that the light output from the light receiving portion 142 is not received by the light receiving portion 142, thereby controlling the posture of the reflector 240. At this time, the angle of the reflecting plate 240 that is rotated by the reflecting plate control unit 250 is appropriately set within a range in which the light output from the light projecting unit 141 of the optical sensor unit 140 is not received by the light receiving unit 142. Here, with reference to FIG. 5, a method of stopping the reflection function of the reflection plate 240 to the light receiving unit 142 by the reflection plate control unit 250 when the power reception side is a power reception rejection will be described in detail. FIG. 5A is a schematic configuration diagram illustrating a case where the reflecting plate is inclined. FIG. 5 b is a schematic configuration diagram illustrating a case where the reflecting plate is rotated by 90 °. FIG. 5c is a schematic configuration diagram illustrating a case where the reflection plate is inverted. For example, when the light from the light projecting unit 141 of the optical sensor unit 140 is reflected to a location different from the light receiving unit 142, the reflecting plate 240 may be rotated so as to be inclined with respect to the ground as shown in FIG. 5a. . Further, in order not to reflect the light from the light projecting unit 141 of the optical sensor unit 140, as shown in FIG. 5b, the reflecting plate 240 is rotated so as to be substantially orthogonal to the ground, or FIG. As shown in FIG. 4, the reflecting plate 240 may be rotated so as to be reversed. Thus, by configuring the reflector control unit 250 from the reversing shaft portion 251 and the reversing actuator 252, the ON / OFF control of the power feeding operation can be realized with a simple configuration.

  By providing such a configuration, the wireless power transmission system 10 that wirelessly transmits power from the power supply apparatus 100 to the power receiving apparatus 200 is realized.

  Subsequently, a power feeding operation of the wireless power transmission system 10 according to the present embodiment will be described.

  First, a vehicle including the power receiving device 200 enters a power feeding area where the power feeding device 100 is disposed, and stops at a parking position.

  Subsequently, when the power feeding device 100 confirms that the vehicle stops at the parking position, light is output from the light projecting unit 141 of the optical sensor unit 140 toward the reflecting plate 240 of the power receiving device 200. Here, when the stop position of the vehicle is outside the power supply permission range of the power supply coil 131 and the power reception coil 211, the light output from the light projecting unit 141 of the optical sensor unit 140 is not reflected by the reflector 240, The light receiving unit 142 does not receive light. For this reason, the supply of power to the power supply coil 131 by the power supply control unit 150 is not started, and wireless power transmission between the power supply apparatus 100 and the power reception apparatus 200 is not performed. On the other hand, when the stop position of the vehicle is within the power supply permission range of the power feeding coil 131 and the power receiving coil 211, the light output from the light projecting unit 141 of the optical sensor unit 140 is reflected by the reflector 240, and the light receiving unit 142 is Detect light. At this time, the light receiving unit 142 outputs a signal indicating that the light has been received to the power supply control unit 150. When the power supply control unit 150 receives a signal indicating that the light is received from the light receiving unit 142 of the optical sensor unit 140, the power supply control unit 150 drives the inverter 120 to start supplying power to the power supply coil (power supply operation ON). Thereby, wireless power transmission from the power supply apparatus 100 to the power receiving apparatus 200 starts.

  Subsequently, when wireless power transmission is started, the load voltage detection unit 230 detects the terminal voltage of the power storage unit 223. Here, when the voltage detected by the load voltage detection unit 230 is equal to or lower than a predetermined threshold value, an output signal is not transmitted from the load voltage detection unit 230 to the reflector control unit 250. In other words, the reflector control unit 250 determines that the power receiving side is permitted to receive power, and the light output from the light projecting unit 141 of the optical sensor unit 140 is reflected by the reflector 240 and received by the light receiving unit 142. The attitude of the reflector 240 is maintained.

  Subsequently, as the charging progresses, the terminal voltage of the power storage unit 223 increases. And if the electrical storage part 223 will be in a full charge state and charge will be completed, a terminal voltage will rise excessively by electric power load fall. When the voltage detected by the load voltage detection unit 230 exceeds a predetermined threshold, the load voltage detection unit 230 outputs an output signal to the reflector control unit 250.

  Subsequently, when the reflector control unit 250 receives an output signal from the load voltage detection unit 230 and determines that the power receiving side is a power rejection, the reflector 240 outputs the light projecting unit 141 of the optical sensor unit 140. By driving the reversing actuator 252 and rotating the reversing shaft 251 so that the light receiving unit 142 does not receive the light to be transmitted, the posture of the reflector 240 is controlled. Thereby, the reflection function to the light-receiving part 142 of the reflecting plate 240 stops. When the light receiving unit 142 of the optical sensor unit 140 no longer detects light, the power supply control unit 150 stops the power supply operation of the inverter 120 (power supply operation OFF). That is, wireless power transmission from the power supply apparatus 100 to the power receiving apparatus 200 ends. As described above, in the wireless power transmission system 10 according to the present embodiment, wireless power transmission can be performed efficiently only when the power feeding coil 131 and the power receiving coil 211 are within the power feeding permission range and the load 220 requests power. .

  As described above, in the wireless power transmission system 10 according to the present embodiment, the power feeding device 100 includes the power feeding control unit 150 that starts power supply to the power feeding coil 131 when the light receiving unit 142 detects light, and includes the power receiving device. 200 includes a reflecting plate 240 that reflects light from the light projecting unit 141 to the light receiving unit 142, and a reflecting plate control unit 250 that controls the light reflecting function of the reflecting plate 240. The reflecting plate control unit 250 receives power on the power receiving side. When refusing, the reflection function to the light-receiving part 142 of the reflecting plate 240 is stopped. For this reason, the power feeding operation is performed only when the power feeding coil 131 and the power receiving coil 211 are in a position where good power transmission efficiency can be obtained, and the power feeding operation can be stopped when a power receiving rejection is requested on the power receiving side. . Therefore, the power feeding operation can be turned on / off at a desired timing while suppressing unnecessary power consumption.

  Further, in the wireless power transmission system 10 according to the present embodiment, the reflecting plate control unit 250 stops the reflecting function to the light receiving unit 142 of the reflecting plate 240 when the power receiving side rejects power reception. The power feeding operation can be controlled without performing communication with the power receiving side. As a result, the power feeding operation can be turned on / off at a desired timing with a low-cost and simple configuration.

  Furthermore, in the wireless power transmission system 10 according to the present embodiment, the power receiving device 200 further includes a load voltage detection unit 230 that detects the voltage value of the load 220, and the load 220 includes a power storage unit that stores power. When the detected voltage value exceeds a predetermined threshold value, the load voltage detection unit 230 notifies the reflector control unit 250 that the power reception is rejected. Therefore, the load voltage detection unit 230 detects an excessive increase in current / voltage due to a decrease in the power load after the storage unit 223 has been charged, and notifies the reflector control unit 250 that the power reception is rejected. It is possible to prevent a wasteful power feeding operation after the charging of the unit 223 is completed. Therefore, wasteful power consumption can be further suppressed.

(Second Embodiment)
Next, the configuration of the wireless power transmission system 20 according to the second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a schematic diagram of a wireless power transmission system according to the second embodiment of the present invention.

  Similar to the wireless power transmission system 10 according to the first embodiment, the wireless power transmission system 20 includes a power feeding device 100 and a power receiving device 200. As shown in FIG. 6, the power feeding device 100 includes a power source 110, an inverter 120, a power feeding coil unit 130, an optical sensor unit 140, and a power feeding control unit 150. As shown, the power receiving coil unit 210, the load 220, the voltage detection unit 260, the current detection unit 270, the reflection plate 240, and the reflection plate control unit 250 are included. The configuration of the power source 110, the inverter 120, the feeding coil unit 130, the optical sensor unit 140, the feeding control unit 150, the receiving coil unit 210, the load 220, the reflecting plate 240, and the reflecting plate control unit 250 is the wireless power according to the first embodiment. This is the same as the transmission system 10. That is, the wireless power transmission system 20 according to the second embodiment includes a voltage detection unit 260 and a current detection unit 270 instead of the load voltage detection unit 230 of the wireless power transmission system 10 according to the first embodiment. This is different from the first embodiment. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The voltage detection unit 260 detects the voltage value of the power system from the power receiving coil 211 to the load 220. In the present embodiment, the voltage detection unit 260 includes a connection unit between the power reception coil unit 210 and the rectification unit 221, a connection unit between the rectification unit 221 and the charging unit 222, and a connection unit between the charging unit 222 and the power storage unit 223. , And the voltage value of the connection part between the power storage part 223 and the motor part 224 are detected. The voltage detection unit 260 compares the detected voltage value with a predetermined threshold value, and transmits an output signal to the reflector control unit 250 when the detected voltage value exceeds the predetermined threshold value. Examples of such a voltage detection unit 260 include a voltage dividing circuit and a voltage detection current transformer. The predetermined threshold is appropriately set according to the timing at which the power receiving side wants to reject power reception. That is, the voltage detection unit 260 plays a role of notifying the reflector control unit 250 that the power receiving side is a power rejection. In the present embodiment, when the predetermined threshold value of the voltage detection unit 260 is set to the allowable voltage value of each circuit element constituting the load 220, power reception can be rejected when an abnormality occurs in the power reception device 200. Further, the predetermined threshold value of the voltage detection unit 260 may be individually set according to the location of the power system that detects the voltage value.

  The current detection unit 270 detects the current value of the power system from the power receiving coil 211 to the load 220. In the present embodiment, the current detection unit 270 includes a connection unit between the power receiving coil unit 210 and the rectification unit 221, a connection unit between the rectification unit 221 and the charging unit 222, and a connection unit between the charging unit 222 and the power storage unit 223. , And the current value of the connecting part between the power storage part 223 and the motor part 224 is detected. Moreover, the current detection unit 270 compares the detected current value with a predetermined threshold value, and transmits an output signal to the reflector control unit 250 when the detected current value exceeds the predetermined threshold value. Examples of such a current detection unit 270 include a current sensor and a current transformer. The predetermined threshold is appropriately set according to the timing at which the power receiving side wants to reject power reception. That is, the current detection unit 270 plays a role of notifying the reflector control unit 250 that the power receiving side is a power rejection. In the present embodiment, when the predetermined threshold value of the current detection unit 270 is set to the allowable current value of each circuit element constituting the load 220, power reception can be rejected when an abnormality occurs in the power reception device 200. Moreover, the predetermined threshold value of the current detection unit 270 may be set individually according to the location of the power system that detects the current value.

  As described above, in the wireless power transmission system 20 according to the present embodiment, the power receiving device 200 includes the voltage detection unit 260 that detects the voltage value of the power system from the power receiving coil 211 to the load 220, and the power receiving coil 211 to the load 220. The voltage detector 260 further includes a current detector 270 that detects the current value of the power system to the power supply. When the detected voltage value exceeds a predetermined threshold, the reflector controller 250 is notified that the power reception is rejected. When the detected current value exceeds a predetermined threshold, the current detection unit 270 notifies the reflector control unit 250 that the power reception is rejected. Therefore, the voltage detection unit 260 and the current detection unit 270 cause an abnormality in the power receiving device 200, detects an increase in voltage and current in the power system from the power receiving coil 211 to the load 220, and causes the reflector control unit 250 to reject power reception. Therefore, the power feeding operation when an abnormality occurs in the power receiving device 200 can be stopped. Therefore, wasteful power consumption can be further suppressed, and the load on the apparatus can be suppressed.

(Third embodiment)
Next, the configuration of the wireless power transmission system 30 according to the third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a schematic diagram of a wireless power transmission system according to the third embodiment of the present invention.

  Similar to the wireless power transmission system 10 according to the first embodiment, the wireless power transmission system 30 includes a power feeding device 100 and a power receiving device 200. As shown in FIG. 7, the power supply apparatus 100 includes a power source 110, an inverter 120, a power supply coil unit 130, an optical sensor unit 140, and a power supply control unit 150. As shown in FIG. 4, the power receiving coil unit 210, the load 220, the temperature detection unit 280, the reflection plate 240, and the reflection plate control unit 250 are included. The configuration of the power source 110, the inverter 120, the feeding coil unit 130, the optical sensor unit 140, the feeding control unit 150, the receiving coil unit 210, the load 220, the reflecting plate 240, and the reflecting plate control unit 250 is the wireless power according to the first embodiment. This is the same as the transmission system 10. That is, the wireless power transmission system 30 according to the third embodiment is different from the load voltage detection unit 230 of the wireless power transmission system 10 according to the first embodiment in that a temperature detection unit 280 is provided. It differs from the form. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The temperature detection unit 280 detects the temperature of the power receiving coil 211. Further, the temperature detection unit 280 detects the temperature of the power system from the power receiving coil 211 to the load 220. In the present embodiment, the temperature detection unit 280 includes a connection unit between the power receiving coil unit 210 and the rectification unit 221, a semiconductor element of the rectification unit 221, a case and a terminal of the charging unit 222, a case and a terminal of the power storage unit 223, and a motor. The temperature of the motor of the part 224 and the terminal are each detected. Further, the temperature detection unit 280 compares the detected temperature with a predetermined threshold, and transmits an output signal to the reflector control unit 250 when the detected temperature exceeds the predetermined threshold. As such a temperature detection part 280, temperature sensors, such as a thermistor, are mentioned. For example, when the temperature detection unit 280 detects the temperature of the power receiving coil 211, a thermistor may be attached to the power receiving coil 211 with a heat insulating tape, and the thermistor is in contact with the power receiving coil 211 with a heat resistant resin. The wiring drawn from the thermistor may be fixed to the power receiving coil 211. The predetermined threshold is appropriately set according to the timing at which the power receiving side wants to reject power reception. That is, the temperature detection unit 280 plays a role of notifying the reflector operating unit 250 that the power receiving side is power rejection. In the present embodiment, when the predetermined threshold value of the temperature detection unit 280 is set to an allowable temperature of each circuit element constituting the load 220, power reception can be rejected when an abnormality occurs in the power reception device 200. Further, the predetermined threshold value of the temperature detection unit 280 may be individually set according to the location of the power receiving coil that detects the temperature and the power system connection unit.

  As described above, in the wireless power transmission system 30 according to the present embodiment, the power receiving device 200 further includes the temperature detection unit 280 that detects the temperature of the power receiving coil 211 and the temperature of the power system from the power receiving coil 211 to the load. When the detected temperature exceeds a predetermined threshold, the temperature detection unit 280 notifies the reflector control unit 250 that power reception is rejected. Therefore, an abnormality occurs in the power receiving device 200 by the temperature detection unit 280, a temperature rise in the power system from the power receiving coil 211 and the power receiving coil 211 to the load 220 is detected, and the reflector control unit 250 is in a power rejection state. Therefore, the power feeding operation when an abnormality occurs in the power receiving device 200 can be stopped. Therefore, wasteful power consumption can be further suppressed, and the load on the apparatus can be suppressed.

(Fourth embodiment)
Next, a configuration of the wireless power transmission system 40 according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a schematic diagram of a wireless power transmission system according to the fourth embodiment of the present invention.

  Similar to the wireless power transmission system 10 according to the first embodiment, the wireless power transmission system 40 includes a power feeding device 100 and a power receiving device 200. As shown in FIG. 8, the power feeding device 100 includes a power source 110, an inverter 120, a power feeding coil unit 130, an optical sensor unit 140, and a power feeding control unit 150. As shown, the power receiving coil unit 210, the load 220, the footrest detection unit 290, the reflection plate 240, and the reflection plate control unit 250 are included. The configuration of the power source 110, the inverter 120, the feeding coil unit 130, the optical sensor unit 140, the feeding control unit 150, the receiving coil unit 210, the load 220, the reflecting plate 240, and the reflecting plate control unit 250 is the wireless power according to the first embodiment. This is the same as the transmission system 10. That is, the wireless power transmission system 40 according to the fourth embodiment is different from the load voltage detection unit 230 of the wireless power transmission system 10 according to the first embodiment in that a footrest detection unit 290 is provided. It is different from the embodiment. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The footrest detection unit 290 detects the presence or absence of an occupant's foot at a predetermined footrest position of the moving body on which the power receiving device 200 is mounted. Specifically, the footrest detection unit 290 is provided on the accelerator pedal, the brake pedal, or the pedal of each pedal on which the foot is placed when the occupant is seated in the seat space where the driver or the occupant sits in the vehicle body of the vehicle. It is installed in the footrest space provided on the side. In addition, the footrest detection unit 290 transmits an output signal to the reflector control unit 250 when the footrest detection unit 290 does not detect a passenger's foot. That is, the footrest detection unit 290 plays a role of notifying the reflector control unit 250 that the power receiving side is a power rejection. Examples of such a footrest detection unit 290 include non-contact detection means such as an optical sensor and contact detection means such as a piezoelectric sensor.

  As described above, in the wireless power transmission system 40 according to the present embodiment, the power receiving device 200 is mounted on a moving body, and a footrest detection unit 290 that detects the presence or absence of an occupant's foot at a predetermined footrest position of the moving body. When the footrest detection unit 290 does not detect the occupant's foot, the footrest detection unit 290 notifies the reflector control unit 250 that the power reception is rejected. Therefore, since the footrest detection unit 290 notifies the reflector control unit 250 that the power reception is rejected when the passenger's foot is not in an appropriate position, to the passenger of leakage magnetic flux generated during wireless power transmission. Can be prevented.

(Fifth embodiment)
Next, the configuration of a wireless power transmission system 50 according to the fifth embodiment of the present invention will be described with reference to FIGS. FIG. 9 is an enlarged schematic configuration diagram of the optical sensor unit, the reflector, and the reflector controller of the wireless power transmission system according to the fifth embodiment of the present invention. FIG. 10 a is a schematic configuration diagram illustrating the opening operation of the antireflection plate. FIG. 10 b is a schematic configuration diagram showing the antireflection plate closing operation. FIG. 11 a is a schematic configuration diagram illustrating the antireflection plate when the antireflection plate is provided with a sweeping portion during the opening operation. FIG. 11 b is a schematic configuration diagram illustrating the antireflection plate closing operation when the antireflection plate includes a sweeping portion.

  Similar to the wireless power transmission system 10 according to the first embodiment, the wireless power transmission system 50 includes a power feeding device 100 and a power receiving device 200. The power feeding device 100 includes a power source 110, an inverter 120, a power feeding coil unit 130, an optical sensor unit 140, and a power feeding control unit 150. The power receiving device 200 includes a power receiving coil unit 210, a load 220, A load voltage detection unit 230, a reflection plate 240, and a reflection plate control unit 250 are included. The configuration of the power source 110, the inverter 120, the power feeding coil unit 130, the optical sensor unit 140, the power feeding control unit 150, the power receiving coil unit 210, the load 220, the load voltage detection unit 230, and the reflector 240 is the wireless power according to the first embodiment. This is the same as the transmission system 10. That is, the wireless power transmission system 50 according to the fifth embodiment is the first in that a reflector control unit 300 is provided instead of the reflector control unit 250 of the wireless power transmission system 10 according to the first embodiment. It is different from the embodiment. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The reflector control unit 300 has a function of controlling the light reflection function of the reflector 240 as in the first embodiment. Specifically, the reflecting plate control unit 300 stops the reflecting function of the reflecting plate 240 to the light receiving unit 142 when the power receiving side is a power rejection. In the present embodiment, the reflection plate control unit 300 includes an antireflection plate 301 and a moving actuator 302, as shown in FIG.

  As shown in FIG. 9, the antireflection plate 301 is disposed on the surface side of the reflection plate 240 facing the optical sensor unit 140 and closer to the optical sensor unit 140 than the reflection plate 240. It is configured to be movable between an overlapping position and a non-overlapping position. Specifically, as shown in FIG. 10 a, the antireflection plate 301 has a first antireflection plate 303 and a second antireflection plate 304, and when it is in a position that does not overlap the reflection plate 240, the reflection plate 240. The first antireflection plate 303 is positioned on one outer side of the reflection plate 240 and the second antireflection plate 304 is positioned on the other outer side of the reflection plate 240 in the direction in which the long sides of the reflection plate 240 face each other. Also, as shown in FIG. 10b, the first and second antireflection plates 301 are arranged such that the end portion of the first antireflection plate 303 and the second antireflection plate 301 are positioned when the antireflection plate 301 overlaps the reflection plate 240. It moves so that the edge part of 304 may contact. The anti-reflection plate 301 only needs to be made of a material that absorbs the light output from the light projecting unit 141 of the optical sensor unit 140 or reduces the reflectance. Further, the size of the antireflection plate 301 may be set to an area that covers the entire main surface of the reflection plate 240 when it is in a position overlapping the reflection plate 240. In the present embodiment, when the antireflection plate 301 is positioned so as to overlap the reflection plate 240, the first antireflection plate 303 covers half of the main surface of the reflection plate 240, and the second antireflection plate 304 is the main surface of the reflection plate 240. It is set to cover the other half. Furthermore, it is preferable that the antireflection plate 301 includes a sweeping unit 305 that wipes the surface of the reflection plate 240 on the surface facing the reflection plate 240. Specifically, as shown in FIG. 11 a, the first antireflection plate 303 is provided with a first sweeping portion 306 on a surface facing the reflection plate 240, and the second antireflection plate 304 is connected to the reflection plate 240. A second sweeping portion 307 is provided on the facing surface. As shown in FIG. 11 b, the first and second sweeping units 305 move the first and second antireflection plates 301 of the reflecting plate 240 when the first and second antireflection plates 301 move from a position that does not overlap the reflecting plate 240 to a position that overlaps. It consists of a brush that contacts the surface. Thereby, the stain | pollution | contamination of the surface of the reflecting plate 240 can be removed with the movement operation | movement of the reflection preventing plate 301. FIG. Therefore, the reflection function of the reflector 240 is ensured, and malfunction can be prevented.

  The moving actuator 302 controls the operation of the antireflection plate 301. Specifically, the movement actuator 302 receives the output signal from the load voltage detection unit 230, and determines that the first antireflection plate 303 does not overlap the reflection plate 240 when the power reception side determines that the power reception is rejected. While controlling to move to the overlapping position, the second antireflection plate 304 is controlled to move from the position not overlapping the reflecting plate 240 to the overlapping position. As this moving actuator 302, for example, a direct acting solenoid can be cited. In addition, when the movement actuator 302 does not receive the output signal from the load voltage detection unit 230, the first and second antireflection plates 301 are controlled to stand by at a position that does not overlap the reflection plate 240. When wireless power transmission is not performed, the first and second antireflection plates 301 may be controlled to move to a position overlapping the reflection plate 240. In this case, the surface of the reflector 240 can be prevented from becoming dirty when the wireless power transmission system 10 is not performing a power feeding operation.

  As described above, in the wireless power transmission system 50 according to the present embodiment, the reflection plate control unit 300 has the reflection prevention plate 301 movable between the position overlapping the reflection plate 240 and the position not overlapping, and the reflection prevention plate. The moving actuator 302 controls the operation of 301. Therefore, ON / OFF control of the power feeding operation can be realized with a simple configuration.

(Sixth embodiment)
Next, with reference to FIG. 12 and FIG. 13, the structure of the wireless power transmission system 60 which concerns on 6th Embodiment of this invention is demonstrated. FIG. 12 is an enlarged schematic diagram of the power feeding apparatus of the wireless power transmission system according to the sixth embodiment of the present invention. FIG. 13 a is a schematic diagram illustrating when the moving body enters the power supply area. FIG. 13B is a schematic diagram illustrating the time when the moving object leaves the power supply area.

  Similar to the wireless power transmission system 10 according to the first embodiment, the wireless power transmission system 60 includes a power feeding device 100 and a power receiving device 200. As shown in FIG. 12, the power supply device 100 includes a power source 110, an inverter 120, a power supply coil unit 130, an optical sensor unit 140, a power supply control unit 150, a power supply area 310, and a moving object detection unit 320. The power reception device 200 includes a power reception coil unit 210, a load 220, a load voltage detection unit 230, a reflection plate 240, and a reflection plate operation unit 250. The configurations of the power source 110, the inverter 120, the power feeding coil unit 130, the power feeding control unit 150, the power receiving coil unit 210, the load 220, the load voltage detection unit 230, the reflecting plate 240, and the reflecting plate control unit 250 are wireless according to the first embodiment. This is the same as the power transmission system 10. That is, the wireless power transmission system 60 according to the sixth embodiment includes a power feeding area 310 and a moving body detection unit 320 in addition to the wireless power transmission system 10 according to the first embodiment, and the optical sensor unit 140. It differs from the first embodiment in terms of function. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The power supply area 310 is a stop space in which power can be supplied from the power supply apparatus 100 of a moving body on which the power reception apparatus 200 is mounted. The power supply area 310 is an area partitioned by a ground power supply station where a power supply facility in which the power supply apparatus 100 is mounted is disposed, and includes a power supply coil 131.

  The moving body detection unit 320 detects entry and departure from the power supply area 310 of the moving body. The moving body detection unit 320 includes non-contact detection means such as an optical sensor. For example, it is preferable to use a transmissive optical sensor. In addition, the moving body detection unit 320 transmits an output signal to the optical sensor unit 140 when detecting the entry and withdrawal of the moving body. In the present embodiment, the moving body detection unit 320 includes a first moving body detection unit 321 installed on the moving body entrance side (entrance side) and a moving body departure side (exit side) sandwiching the power feeding area. 2 has a moving body detection unit 322. That is, as shown in FIG. 13a, when the mobile body enters the power supply area, the first mobile body detection unit 321 detects the entrance of the mobile body and transmits an output signal to the optical sensor unit 140. As shown in FIG. 5, when the moving body leaves the power supply area, the second moving body detection unit 322 detects the removal of the moving body and transmits an output signal to the optical sensor unit 140.

  In the present embodiment, the optical sensor unit 140 starts output of light from the light projecting unit 141 when the moving body detection unit 320 detects the entry of the moving body, and the moving body detection unit 320 causes the moving body to leave. Is detected, the light output from the light projecting unit 141 is stopped. Specifically, when the optical sensor unit 140 receives an output signal from the first moving body detection unit 321, it starts outputting light from the light projecting unit 141 and receives an output signal from the second moving body detection unit 322. The light output from the light projecting unit 141 is stopped.

  As described above, in the wireless power transmission system 60 according to the present embodiment, the power receiving device 200 is mounted on a mobile object, and the power supply device 100 is connected to the power supply area 310 including the power supply coil 131 and the power supply area 310 of the mobile object. And the optical sensor 140 starts the output of light from the light projecting unit 141 when the moving body detecting unit 320 detects the entering of the moving body, When the moving body detection unit 320 detects the detachment of the moving body, the light output from the light projecting unit 141 is stopped. Therefore, since the optical sensor unit 140 is driven only when a moving body exists in the power feeding area 310, power consumption can be further suppressed.

(Seventh embodiment)
Next, a configuration of a wireless power transmission system 70 according to the seventh embodiment of the present invention will be described with reference to FIGS. 14 and 15. FIG. 14 is a configuration diagram of a wireless power transmission system according to the seventh embodiment of the present invention. FIG. 15a is an enlarged schematic configuration diagram of an optical sensor unit (cover opening) of the wireless power transmission system according to the seventh embodiment of the present invention. FIG. 15B is an enlarged schematic configuration diagram of the optical sensor unit (cover unit closed) of the wireless power transmission system according to the seventh embodiment of the present invention.

  Similarly to the wireless power transmission system 60 according to the sixth embodiment, the wireless power transmission system 70 includes a power feeding device 100 and a power receiving device 200. As shown in FIG. 14, the power supply apparatus 100 includes a power source 110, an inverter 120, a power supply coil unit 130, an optical sensor unit 140, and a power supply control unit 150. As shown, the power receiving coil unit 210, the load 220, the load voltage detection unit 230, the reflection plate 240, and the reflection plate control unit 250 are included. The configurations of the power source 110, the inverter 120, the power feeding coil unit 130, the power feeding control unit 150, the power receiving coil unit 210, the load 220, the load voltage detection unit 230, the reflecting plate 240, and the reflecting plate control unit 250 are wireless according to the sixth embodiment. This is the same as the power transmission system 60. That is, the wireless power transmission system 70 according to the seventh embodiment includes the optical sensor unit 330 instead of the optical sensor unit 140 of the wireless power transmission system 60 according to the sixth embodiment. Is different. Hereinafter, a description will be given centering on differences from the sixth embodiment.

  As shown in FIGS. 15a and 15b, the optical sensor unit 330 is configured by a reflective optical sensor and outputs light, similarly to the wireless power transmission system 10 according to the first embodiment. A light receiving portion 332 for detecting light. In the present embodiment, the optical sensor unit 330 is installed on the stand 333 so that the surface of the light projecting unit 331 (the portion that outputs light) and the surface of the light receiving unit 332 (the portion that receives light) face in the vertical direction. In addition to the light projecting unit 331 and the light receiving unit 332, a cover unit 334 is provided. The cover unit 334 is installed on a stand 333 that supports the optical sensor unit 330 so as to cover the surfaces of the light projecting unit 331 and the light receiving unit 332 so as to be openable and closable. As shown in FIG. 15a, the cover 334 opens so as to expose the surfaces of the light projecting unit 331 and the light receiving unit 332 when outputting light from the light projecting unit 331, and as shown in FIG. 15b, When the output of light from the light projecting unit 331 is stopped, the light projecting unit 331 and the light receiving unit 332 are closed so as to cover the surfaces. That is, the cover unit 334 is configured to be driven in conjunction with the light projecting operation of the optical sensor unit 330. The opening / closing operation of the cover portion 334 configured as described above is controlled by, for example, a rotary actuator.

  As described above, in the wireless power transmission system 70 according to this embodiment, the optical sensor unit 330 includes the cover unit 334 that can be opened and closed to cover the surfaces of the light projecting unit 331 and the light receiving unit 332. Therefore, it is possible to prevent dirt from adhering to the surfaces of the light projecting unit 331 and the light receiving unit 332 of the optical sensor unit 330, and to prevent malfunction.

  The present invention has been described based on the embodiments. It will be understood by those skilled in the art that the embodiments are illustrative, and that various modifications and changes are possible within the scope of the claims of the present invention, and that such modifications and changes are also within the scope of the claims of the present invention. It is a place. Accordingly, the description and drawings herein are to be regarded as illustrative rather than restrictive.

  For example, the load voltage detector 230 in the first embodiment, the voltage detector 260 and the current detector 270 in the second embodiment, the temperature detector 280 in the third embodiment, and the footrest detector 290 in the fourth embodiment, respectively. Although described as means for determining power reception rejection on the power receiving side, these detection units may be used in combination. In this case, any power reception rejection on the power receiving side can be detected, and efficient wireless power transmission becomes possible.

  DESCRIPTION OF SYMBOLS 10, 20, 30, 40, 50, 60, 70 ... Wireless power transmission system, 100 ... Power feeding device, 110 ... Power source, 120 ... Inverter, 130 ... Feeding coil part, 131 ... Feeding coil, 132 ... Magnetic body, 133 ... Power feeding side resonance capacitor, 134: housing, 140, 330: optical sensor unit, 141, 331 ... light projecting unit, 142, 332 ... light receiving unit, 150 ... power feeding control unit, 200 ... power receiving device, 210 ... power receiving coil unit, 211 ... Receiving coil, 212 ... Magnetic material, 213 ... Receiving side resonance capacitor, 214 ... Case, 220 ... Load, 221 ... Rectifying unit, 222 ... Charging unit, 223 ... Power storage unit, 224 ... Motor unit, 230 ... Load voltage Detecting unit, 240 ... reflector, 250, 300 ... reflector controller, 251 ... reversing shaft, 252 ... reversing actuator, 253 ... shaft, 254 ... cover, 2 DESCRIPTION OF SYMBOLS 0 ... Voltage detection part, 270 ... Current detection part, 280 ... Temperature detection part, 290 ... Footrest detection part, 301 ... Antireflection board, 302 ... Moving actuator, 303 ... 1st antireflection board, 304 ... 2nd antireflection 305 ... first sweeping unit, 307 ... second sweeping unit, 310 ... feeding area, 320 ... moving body detection unit, 321 ... first moving body detection unit, 322 ... second ... moving body detection Part, 333 ... stand, 334 ... cover part.

Claims (12)

A wireless power transmission system that wirelessly transmits power from a power feeding device to a power receiving device,
The power supply device
A power supply coil that is arranged on the ground and receives an electric power from a power source to generate an alternating magnetic field;
A light projecting unit that outputs light, a light sensor unit that includes a light receiving unit that detects the light, and
A power supply control unit that starts supplying power to the power supply coil when the light receiving unit detects the light; and
The power receiving device is:
A receiving coil that receives power from the feeding coil via the alternating magnetic field;
A load that consumes or stores power received by the power receiving coil; and
A reflector that reflects the light from the light projecting unit to the light receiving unit;
A reflector control unit that controls the light reflection function of the reflector,
The said reflecting plate control part stops the reflection function to the said light-receiving part of the said reflecting plate, when a power receiving side refuses power reception, The wireless power transmission system characterized by the above-mentioned.   The wireless power transmission system according to claim 1, wherein the reflector is set to a size of a power supply permission range of the power supply coil and the power reception coil. The power receiving device further includes a load voltage detection unit that detects a voltage value of the load,
The load is composed of a power storage unit that stores power,
3. The wireless power transmission according to claim 1, wherein when the detected voltage value exceeds a predetermined threshold, the load voltage detection unit notifies the reflector control unit that the power reception is rejected. 4. system. The power receiving device further includes a voltage detection unit that detects a voltage value of a power system from the power reception coil to the load, and a current detection unit that detects a current value of the power system from the power reception coil to the load. ,
When the detected voltage value exceeds a predetermined threshold, the voltage detection unit notifies the reflector control unit that power reception is rejected,
The said current detection part notifies that it is a power reception refusal to the said reflector control part, when the detected electric current value exceeds a predetermined threshold value, It is characterized by the above-mentioned. Wireless power transmission system. The power receiving device further includes a temperature detection unit that detects a temperature of the power receiving coil and a temperature of a power system connection unit from the power receiving coil to the load,
5. The temperature detection unit according to claim 1, wherein when the detected temperature exceeds a predetermined threshold, the reflection plate control unit is notified that power reception is rejected. 6. Wireless power transmission system. The power receiving device further includes a footrest detection unit that is mounted on a moving body and detects the presence or absence of an occupant's foot at a predetermined footrest position of the moving body,
The wireless power transmission according to any one of claims 1 to 5, wherein when the footrest detection unit does not detect a passenger's foot, the reflector control unit notifies the reflector control unit that power reception is rejected. system.   The said reflecting plate control part is comprised from the inversion shaft part which supports the said reflecting plate rotatably, and the inversion actuator which controls the rotation operation of the said inversion shaft part, The any one of Claims 1-6 characterized by the above-mentioned. The wireless power transmission system according to one item.   The reflection plate control unit includes an antireflection plate movable between a position overlapping with the reflection plate and a position not overlapping with the reflection plate, and a moving actuator for controlling the operation of the antireflection plate. Item 7. The wireless power transmission system according to any one of Items 1 to 6.   The wireless power transmission system according to claim 8, wherein the antireflection plate further includes a sweeping unit that wipes a surface of the reflection plate on a surface facing the reflection plate. The power receiving device is mounted on a moving body,
The power supply apparatus includes a power supply area including the power supply coil, and a moving body detection unit that detects the moving body entering and leaving the power supply area,
The optical sensor unit starts output of light from the light projecting unit when the moving body detection unit detects entry of the moving body, and the moving body detection unit detects separation of the moving body. Then, the wireless power transmission system according to any one of claims 1 to 9, wherein output of light from the light projecting unit is stopped.   11. The wireless power transmission system according to claim 1, wherein the optical sensor unit includes an openable / closable cover that covers surfaces of the light projecting unit and the light receiving unit.   The wireless power transmission system according to claim 1, wherein the light projecting unit causes the light to intermittently emit light.

Images