JP4929958B2 - Contactless power supply system - Google Patents

Description

  The present invention relates to a non-contact power supply system that supplies power to a moving body in a non-contact manner using electromagnetic waves.

  2. Description of the Related Art Conventionally, a non-contact power feeding system that supplies power to a moving body in a non-contact manner from a power source via a power feeding line is known (for example, see Patent Document 1). The non-contact power feeding system disclosed in Patent Document 1 specifies a section where a moving body exists based on the position information of the moving body, turns on a feeding line in the section where the moving body exists by switching a switch, By turning off the power supply line in the non-existing section, power is not supplied to the section where there is no moving body. Such a conventional non-contact power supply system uses the principle of electromagnetic induction, and a moving body is required by picking up a magnetic flux generated by passing a current through a power supply line provided in the rail with a power receiving core. It is a system that converts it into electric power.

In recent years, development of a system for supplying power to a moving body in a non-contact manner by electromagnetic energy such as microwaves has been advanced. In a non-contact power feeding system using electromagnetic waves, an electromagnetic wave generated by an electromagnetic wave generating device propagates through one or more waveguides and is spatially radiated from the feeding point to the moving body. Power is supplied.
JP 2000-103263 A

  By the way, in the non-contact power feeding system using electromagnetic waves as in the prior art, it is necessary to suppress the emission of useless electromagnetic waves by radiating the electromagnetic waves only in the section where the moving body exists. As a method for realizing the radiation of electromagnetic waves only in the existence section of the moving body, for example, when the moving body exists based on a sensing signal in which the electromagnetic wave generating device senses the section in which the moving body exists, the electromagnetic wave is generated to generate the moving body. In the case where no is present, a method of repeatedly stopping the generation of the electromagnetic wave can be considered (on / off of the electromagnetic wave generator).

  However, in order to stably oscillate the electromagnetic wave, it takes time to switch the electromagnetic wave generator on and off because the heater needs to be heated for generating the electromagnetic wave. Therefore, depending on the moving speed of the moving body, there is a possibility that the detected power feeding to the moving body may not be in time.

  Then, this invention aims at provision of the non-contact electric power feeding system which can perform the electric power feeding to the moving body by electromagnetic waves rapidly.

In order to achieve the above object, a contactless power feeding system of the present invention includes:
A non-contact power feeding system that non-contact feeds a moving body by electromagnetic waves,
A source of the electromagnetic wave;
A waveguide for propagating electromagnetic waves generated from the source to an electromagnetic wave supply point;
And switching means for switching the propagation path of the electromagnetic wave propagating in the waveguide to an electromagnetic wave supply point through which the moving body passes. As a result, the path of the electromagnetic wave itself that is already propagating is changed, so that feeding of the moving body by the electromagnetic wave can be performed without delay.

  Here, it is preferable that the non-contact power feeding system of the present invention includes a position detection unit that detects an existing position of the moving body, and the switching unit switches the propagation path based on a detection result of the position detection unit. is there.

  The switching unit may be an opening / closing unit that opens and closes the waveguide so that electromagnetic waves in the waveguide can be supplied to a moving body outside the waveguide. For example, the opening / closing means is preferably opened and closed according to a magnetic force relationship between a magnet mounted on the movable body and a magnet installed on the opening / closing means.

  The switching means may switch the propagation path by switching a waveguide toward the electromagnetic wave supply point. That is, one of the plurality of waveguides is switched to one.

  The generation source includes a magnetron that generates a microwave.

  ADVANTAGE OF THE INVENTION According to this invention, the electric power feeding to a moving body by electromagnetic waves can be performed rapidly.

  The present invention provides a non-contact power feeding system to a moving body such as a moving electric vehicle by applying an energy transmission technique using electromagnetic waves such as microwaves. The energy transmission technology using electromagnetic waves is a technology for converting electric energy into radio wave energy of a predetermined frequency (for example, 2.45 GHz microwave) and transmitting the energy wirelessly. Energy transmission technology using electromagnetic waves is different from wired energy transmission technology, which has limitations in power transmission to mobiles, in that power transmission to mobiles is also possible.

  FIG. 1 is a schematic diagram of a microwave energy transmission system. In the electromagnetic wave generator on the power transmission side, direct-current or alternating-current transmission power is converted into microwaves. As a means for converting electric power into a microwave, for example, there is a magnetron that is also used in a microwave oven. The microwave output from the magnetron is radiated from the power transmission antenna. The radiated power is received and rectified by a microwave power receiving rectifier element called a rectenna, and is taken out as DC power. The rectenna is a microwave power receiving rectifying element in which a power receiving antenna and a rectifying circuit are integrated.

  An embodiment of a non-contact power feeding system using electromagnetic waves according to the present invention will be described for a case where a mobile object to be fed is a vehicle. FIG. 2 is a schematic diagram of a non-contact power supply system that supplies power to a moving vehicle. For the electric vehicle 50 traveling on the power transmission road through which the microwave generated by the microwave source propagates, the power radiated from the power transmission antenna (microwave radiation antenna) laid on the power transmission road is received and rectified by the rectenna, DC power is supplied to a drive source of the electric vehicle 50 such as a battery or a motor. Thus, the electric vehicle 50 can travel while suppressing battery consumption by external power feeding while traveling.

  FIG. 3 is a diagram illustrating a first embodiment of the non-contact power feeding system according to the present invention. The microwave radiating antenna that radiates microwaves for supplying power to the vehicle 50 is also preferably a planar antenna since it also serves as a road for the vehicle 50. Examples of the planar antenna include a circular patch antenna, a slot antenna with a cavity, and a waveguide slot antenna. A waveguide slot antenna 20 is used as the microwave radiation antenna of the contactless power feeding system of the present embodiment.

  The waveguide slot antenna 20 radiates a part of the microwave propagating inside the waveguide by cutting the slot 21 on the surface of the waveguide. The waveguide is a hollow metal cylinder having a rectangular cross section. When a microwave is fed into this waveguide, the microwave propagates through the tube if the microwave is higher than the frequency determined by the shape of the tube, and the microwave cannot propagate if it is lower. When a slot that crosses the surface current is provided in the waveguide, a part of the microwave propagating in the waveguide is radiated from the slot into the space. A waveguide provided with such a slot is called a waveguide slot antenna.

  Since the waveguide slot antenna 20 is provided with a plurality of slots, and the mutual coupling between the slots is small, it is possible to form an array antenna by arranging the antennas closely. Since the waveguide slot antenna 20 has a structure that directly radiates microwaves from the waveguide, a relatively simple circuit configuration can be obtained by using a magnetron for the electromagnetic wave generator 10 that generates microwaves. Power microwaves can be emitted. For this reason, it is not necessary to provide the power source of the power transmission circuit under the road, and the antenna and the power source can be exchanged as necessary, so that maintenance is easy. Further, since the waveguide is made of metal, it has sufficient strength as a road on which the vehicle 50 travels.

  The waveguide slot antenna 20 radiates microwaves from the slot 21 into free space. The opening size of the slot 21 is negligibly small compared to the vehicle 50. In the non-contact power feeding system of this embodiment, a plurality of waveguide slot antennas 20 exist, and the electromagnetic wave output from the electromagnetic wave generator 10 needs to be distributed and fed to the plurality of waveguides. By distributing power supply, the number of installed electromagnetic wave generators 10 can be reduced. FIG. 4 is a diagram showing an example of a waveguide slot antenna array in which a plurality of waveguide slot antennas 20 are arranged. FIG. 4A is a diagram illustrating an example in which the electromagnetic wave output from the electromagnetic wave generator 10 is distributed and fed to the three waveguide slot antennas 20a, 20b, and 20c. FIG. 4B is a diagram showing a waveguide slot antenna array in which a plurality of waveguide slot antennas 20 are arranged at intervals of half the guide wavelength λg. FIG. 4C shows a waveguide slot antenna array in which a plurality of waveguide slot antennas 20 are arranged so that the traveling direction of the vehicle and the electromagnetic wave traveling direction in the waveguide slot antenna 20 are the same. FIG. In the case of FIG.4 (c), since the electromagnetic wave generator 10 can be concentrated on the one side of a road, it is possible to comprise a road in the state where only one side of the road was closed.

  As illustrated in FIG. 4, when the waveguide slot antennas are laid adjacent to each other, as one of the feeding methods from the electromagnetic wave generator 10 to each waveguide slot antenna, a plurality of waveguides using coupling slots are used. A method of supplying electric power to the battery can be considered. FIG. 5 is a diagram illustrating a power feeding method using a coupling slot. As shown in FIG. 5, two waveguides are perpendicularly overlapped with each other, and a slot having the same shape is provided in the overlapped portion. Through this slot, a part of the electric power carried from the electromagnetic wave generator 10 through the feeding waveguide is transmitted to the waveguide slot antenna 20.

  As shown in FIG. 3, the microwave radiated from the slot 21 of the waveguide slot antenna 20 is received by the power receiving antenna 51 mounted on the vehicle 50. The power receiving antenna 51 receives the microwave radiated from the waveguide slot antenna 20 and supplies power to the vehicle 50. The power receiving antenna 51 is desirably a planar antenna installed on the bottom surface of the vehicle 50 so that the microwave radiated from the road surface can be easily received. A specific example of the power receiving antenna 51 is a circular patch antenna because the power transmission / reception interval is narrow and the bottom surface of the vehicle is metal. FIG. 6 is a bottom view of the vehicle 50. Fig.6 (a) is a bottom view of the vehicle 50 in the non-contact electric power feeding system of 1st Embodiment. A plurality of power receiving antennas 51 are arranged in an array on the bottom surface of the vehicle 50. Further, strong magnets 52a and 52b are installed so as to sandwich the power receiving antenna 51 in the vehicle width direction. The strong magnets 52a and 52b will be described later.

  In FIG. 3, the electromagnetic wave generator 10 converts a direct current or alternating current power source into a microwave and feeds the microwave to the waveguide slot antenna 20. Specific examples of the electromagnetic wave generator 10 include a semiconductor amplifier that amplifies a signal from an oscillator such as a magnetron, a signal generator, or a crystal oscillator to generate a microwave.

  FIG. 7 is an equivalent circuit of a magnetron. A magnetron has a filament part and an anode part as places where voltage is applied. In order to generate microwaves from the magnetron, a voltage is applied to the filament to heat the filament to a state where electrons are likely to be emitted, and then a voltage is applied to the anode. Therefore, if the filament is not heated to a certain extent, even if a voltage is applied to the anode, a response delay occurs in the generation of microwaves. Therefore, if voltage is applied to the anode while the filament is heated to a state where electrons are likely to be emitted in advance (for example, voltage is applied to the anode after 2 seconds from the start of heating), microwave emission starts at the moment of application. obtain.

  By the way, the electromagnetic wave generator 10 can uniformly supply power to each waveguide slot antenna 20, but if only the slot 21 is provided in the waveguide slot antenna 20, the radiation of microwaves in slot units is possible. Control is not possible. If the microwave radiation cannot be controlled in units of slots, the microwaves are radiated from the slot 21 even in the section where the vehicle is not present, and the wasteful energy loss of the microwaves increases. Therefore, the contactless power feeding system of the first embodiment is provided with an opening / closing mechanism that opens and closes the inside of the waveguide slot antenna 20 and the free space.

  FIG. 8 is a view for explaining an opening / closing mechanism of the slot 21 of the waveguide slot antenna 20 according to the first embodiment. FIG. 8A is a diagram showing a power transmission road composed of the waveguide slot antenna 20 and a vehicle 50 traveling on the road. FIG. 8B is a perspective view of the inside of the waveguide slot antenna 20. A rail 25 is provided on the surface of the waveguide slot antenna 20 on the vehicle side, and the moving magnet 22 slides along the rail 25 to open and close the slot 21. The microwave propagating in the waveguide slot antenna 20 is radiated outside the tube through the slot 21 opened by the slide of the moving magnet 22. On the contrary, by closing the slot 21 with the slide of the moving magnet 22, it is possible to stop the radiation of the microwaves propagating in the waveguide slot antenna 20 out of the tube. That is, the microwave propagation path is switched by opening and closing the slot 21.

  FIG. 9 is a diagram for explaining a mode in which the microwave propagating through the waveguide slot antenna 20 in the first embodiment shown in FIG. A strong magnet 52 is installed on the bottom surface of the vehicle 50, and a moving magnet 22 and a fixed magnet 23 are installed for each slot 21 inside the waveguide slot antenna 20 where the vehicle 50 travels. As shown in FIG. 9, in the strong magnet 52, the side facing the power transmission road is magnetized to the N pole, and the opposite side is magnetized to the S pole. Further, the moving magnet 22 that slides along the rail 25 shown in FIG. 8 and the fixed magnet 23 fixed in the tube of the waveguide slot antenna 10 are the N pole side of the moving magnet 22 and the S pole of the fixed magnet 23. It arrange | positions so that the side may oppose.

  When the vehicle 50 does not exist on the power transmission road (that is, when the strong magnet 52 does not exist on the moving magnet 22 or the fixed magnet 23), the magnetism acting between the N pole of the moving magnet 22 and the S pole of the fixed magnet 23. Due to the force, the moving magnet 22 and the fixed magnet 23 are in contact with each other. When the moving magnet 22 is in contact with the fixed magnet 23, the slot 21 is closed.

  When the vehicle 50 enters the power transmission road as shown in FIG. 3, the magnetic force acting between the N pole of the strong magnet 52 and the S pole of the moving magnet 22, the N pole of the moving magnet 22, and the fixed magnet 23. A combined magnetic force with the magnetic force acting between the S poles acts on the moving magnet 22. Therefore, the moving magnet 22 has a vehicle traveling direction component magnetic force acting between the N pole of the strong magnet 52 and the S pole of the moving magnet 22, the N pole of the moving magnet 22, and the S pole of the fixed magnet 23. It slides according to the magnitude relationship with the magnetic force that works between the two. Here, in the state where the moving magnet 22 and the fixed magnet 23 are in contact with each other, the magnetic force of the vehicle traveling direction component of the magnetic force acting between the N pole of the strong magnet 52 and the S pole of the moving magnet 22 is the moving magnet. It is adjusted to be at least larger than the magnetic force acting between the N pole of 22 and the S pole of the fixed magnet 23.

  When the vehicle 50 enters the power transmission road as shown in FIG. 3, the moving magnet 22 is pulled along the rail 25 in the vehicle traveling direction as the vehicle 50 travels. The pulled moving magnet 22 is stopped by a slide stopper 24 fixed to the waveguide slot antenna 10 in the tube. As the moving magnet 22 slides along the rail 25 in the vehicle traveling direction, the slot 21 is opened. When the slot 21 is opened, the microwave propagating through the waveguide slot antenna 20 generated by the electromagnetic wave generator 10 is radiated outside the tube.

  As the distance between the N pole of the strong magnet 52 mounted on the vehicle 50 and the S pole of the moving magnet 22 increases as the vehicle 50 advances, the distance between the N pole of the strong magnet 52 and the S pole of the moving magnet 22 increases. The magnetic force acting on the is reduced. Therefore, as the vehicle 50 travels, the magnetic force of the vehicle traveling direction component of the magnetic force acting between the N pole of the strong magnet 52 and the S pole of the moving magnet 22 causes the N pole of the moving magnet 22 and the S of the fixed magnet 23 to move. When it becomes smaller than the magnetic force acting between the poles, the moving magnet 22 is pulled by the fixed magnet 23 and slides along the rail 25 in the direction opposite to the vehicle traveling direction, thereby closing the slot 21. When the slot 21 is closed, the microwave propagating in the waveguide slot antenna 20 generated by the electromagnetic wave generator 10 is not radiated outside the tube.

  A cushioning material may be provided between the moving magnet 22 and the slide stopper 24 or between the moving magnet 22 and the fixed magnet 23 in order to reduce the impact.

  Therefore, according to the first embodiment, since the slot 21 opens and closes based on the magnetic force relationship that changes according to the movement of the vehicle 50, the microwave generated by the electromagnetic wave generator 10 is introduced into the waveguide slot antenna 20. If propagating, the power supply to the vehicle 50 by the microwave can be promptly performed without depending on the on / off switching time of the electromagnetic wave generator 10. Further, since the slot 21 opens and closes based on the magnetic force relationship that changes in accordance with the movement of the vehicle 50, power can be supplied only to the section where the vehicle 50 exists. As a result, section power feeding without energy leakage outside the section where the vehicle 50 is present can be realized, so that microwave transmission efficiency and safety are improved.

  FIG. 10 is a diagram showing a second embodiment of the non-contact power feeding system according to the present invention. In the configuration of the second embodiment, parts having the same or similar functions as those of the first embodiment are given the same reference numerals as those of the first embodiment, and the description thereof is omitted or simplified.

  In the second embodiment, as shown in FIG. 6 (b), a plurality of power receiving antennas 51 are arranged and arrayed on the bottom surface of the vehicle 50. The power receiving antenna 51 receives the microwave radiated from the waveguide slot antenna 20 and supplies power to the vehicle 50. In the second embodiment, a plurality of waveguide slot antennas 20 are arranged in the traveling direction of the vehicle, and each waveguide slot antenna corresponds to a feeding section.

  The vehicle position detection sensor 25 is a sensor that detects the position of the vehicle 50 on the power transmission road constituted by the waveguide slot antenna 20. The vehicle position detection sensor 25 may be any sensor that can detect that the vehicle 50 passes through a power feeding section that feeds power to the vehicle 50, and specific examples thereof include a photoelectric tube sensor and a weight sensor. The detection information of the vehicle 50 is transmitted to the propagation path switch 31. The vehicle position detection sensor 25 is desirably installed for each waveguide slot antenna 20 (power feeding section), and each vehicle position detection sensor 25 detects the presence or absence of the vehicle 50 in the installed power feeding section.

  The propagation path switch 31 is provided between the electromagnetic wave generator 10 and the waveguide slot antenna 20, and the microwave generated by the electromagnetic wave generator 10 propagates based on the vehicle detection signal from the vehicle position detection sensor 25. The switching of the power feeding waveguide 30 is controlled. The feeding waveguide 30 is installed for each waveguide slot antenna 20. The microwave generated by the electromagnetic wave generator 10 is sent to the waveguide slot antenna 20 connected to the power feeding waveguide 30 switched by the propagation path switch 31.

  The propagation path switch 31 detects the microwave generated by the electromagnetic wave generator 10 when the vehicle position detection sensor 25 installed in the waveguide slot antenna 20a detects that the vehicle 50 exists on the waveguide slot antenna 20a. Is switched to the feeding waveguide 30a so that the microwaves are not propagated in the feeding waveguides 30b and 30c. Similarly, the propagation path switch 31 is generated by the electromagnetic wave generator 10 when the vehicle position detection sensor 25 installed in the waveguide slot antenna 20b detects that the vehicle 50 exists on the waveguide slot antenna 20b. The microwave propagation path is switched to the power supply waveguide 30b so that the microwaves are not propagated in the power supply waveguides 30a and 30c. This is repeated for each waveguide slot antenna 20.

  Therefore, according to the second embodiment, the waveguide slot antenna 20 from which the microwave is radiated is switched based on the position where the vehicle 50 is present, and therefore the microwave generated by the electromagnetic wave generator 10 is supplied to the feeding waveguide. If it propagates in 30, the power supply to the vehicle 50 by the microwave can be promptly performed without depending on the on / off switching time of the electromagnetic wave generator 10. Further, since the waveguide slot antenna 20 that emits microwaves is switched based on the position where the vehicle 50 exists, power can be supplied only to the section where the vehicle 50 exists. As a result, section power feeding without energy leakage outside the section where the vehicle 50 is present can be realized, so that microwave transmission efficiency and safety are improved.

  FIG. 11 is a diagram showing a third embodiment of the non-contact power feeding system according to the present invention. In the configuration of the third embodiment, parts having the same or similar functions as those in the first or second embodiment are denoted by the same reference numerals as those in the first or second embodiment, and description thereof is omitted. Or simplify.

  In the third embodiment, as shown in FIG. 6B, a plurality of power receiving antennas 51 are arranged in an array on the bottom surface of the vehicle 50. The power receiving antenna 51 receives the microwave radiated from the waveguide slot antenna 20 and supplies power to the vehicle 50.

  In the third embodiment, the slot 21 is opened and closed by the plate 27. The plate 27 is attached around a belt 28 installed in the waveguide slot antenna 20, and the slot 21 is opened and closed by sliding the belt 28. The plate 27 has the same shape as the moving magnet 22 of the first embodiment, and is preferably made of the same material as the waveguide slot antenna 20 and is lightweight and flexible. The plate 27 may be attached to one side or both sides of the belt 28 (FIG. 11 shows a case where the plate 27 is attached to one side of the belt 28). The rotation of the belt 28 to which the plate 27 is attached is performed by the motor 26. The motor 26 controls the rotation of the belt 28 based on the vehicle detection signal from the vehicle position detection sensor 25. The motor 26 and the vehicle position detection sensor 25 are installed in pairs for each power feeding section in which the power transmission road is divided at predetermined distances. When the plate 27 is attached to one side of the belt 28, for example, the slot 21 is closed by the plate 27 when the motor 26 is rotated clockwise, and the slot 21 is opened by the plate 27 when the motor 26 is rotated counterclockwise, for example. When the plate 27 is attached to both sides of the belt 28, the slot 21 is repeatedly closed and opened by the plate 27 only by the forward rotation of the motor 26.

  FIG. 12 is a diagram for explaining an opening / closing mechanism of the slot 21 of the waveguide slot antenna 20 according to the third embodiment. A plurality of belts 28 are provided in the tube of the waveguide slot antenna 20, and the slots 21 are opened and closed by plates 27 that bridge the belts 28. When the presence of the vehicle 50 is detected by the vehicle position detection sensor 25, the motor 26 is driven based on the detection signal. When the vehicle position detection sensor 25 corresponding to the motor 26 in a certain power feeding section detects that the vehicle 50 is present on the waveguide slot antenna 20 in the power feeding section, the motor 26 of the waveguide slot antenna 20 The slot 21 rotates so as to be opened by the plate 27.

  The slot 21 may be opened and closed by a lid method in which the plate 27 is covered with the plate 27 instead of a slide method in which the plate 27 is slid by the belt 28. FIG. 13 is a schematic view of a lid method in which the slot 21 is covered with the plate 27 in the third embodiment. The rotation of the motor 26 is transmitted to the rotation shaft 27 a of the plate 27 via the timing belt 28. The plate 27 opens and closes the slot 21 around the rotation shaft 27a. The motor 26 may be rotated so as to open and close the slot 21 by the plate 27 based on the detection signal of the vehicle position detection sensor 25 as in the above-described slide system.

  Therefore, according to the third embodiment, since the slot 21 of the waveguide slot antenna 20 opens and closes based on the position where the vehicle 50 is present, the microwave generated by the electromagnetic wave generator 10 is transmitted in the waveguide slot antenna 20. , The power supply to the vehicle 50 by the microwave can be promptly performed without depending on the on / off switching time of the electromagnetic wave generator 10. Further, since the slot 21 of the waveguide slot antenna 20 opens and closes based on the position where the vehicle 50 exists, power can be supplied only to the section where the vehicle 50 exists. As a result, section power feeding without energy leakage outside the section where the vehicle 50 is present can be realized, so that microwave transmission efficiency and safety are improved.

  FIG. 14 is a diagram showing a fourth embodiment of the non-contact power feeding system according to the present invention. In the configuration of the fourth embodiment, parts having the same or similar functions as those of the first, second, or third embodiment are given the same reference numerals as those of the first, second, or third embodiment. These descriptions are omitted or simplified.

  In the fourth embodiment, as shown in FIG. 6B, a plurality of power receiving antennas 51 are arrayed on the bottom surface of the vehicle 50. The power receiving antenna 51 receives the microwave radiated from the waveguide slot antenna 20 and supplies power to the vehicle 50.

  In the fourth embodiment, the slot 21 is opened and closed by the plate 27. The plates 27 that open and close the slots 21 are connected to each other by links 29. The plate 27 has the same shape as the moving magnet 22 of the first embodiment, and is preferably made of the same material as the waveguide slot antenna 20 and is lightweight and flexible. The link 29 slides the plate 27 and is a linear or bar-like object such as a wire. As the link 29 slides, the slot 21 is opened and closed. The link 29 slides back and forth in conjunction with the pedal 40.

  FIG. 15 is a view for explaining the linkage between the pedal 40 and the link 29. Like the rocker switch, the pedal 40 has a structure in which the other end rises when one end is lowered, and the vehicle weight is added to the pedal 40 to slide the link 29 in the waveguide slot antenna 20 tube. The pedal 40 and the link 29 coupled to the pedal 40 are installed in pairs for each power feeding section obtained by dividing the power transmission road at a predetermined distance. The pedal 40 swings at a fulcrum 40a. When the front wheel of the vehicle 50 steps on one end of the pedal 40, the link 29 connected to the pedal 40 slides forward to open the slot 21. When the slot 21 is opened, microwaves propagating in the tube generated by the electromagnetic wave generator 10 are radiated. Thereafter, when the rear wheel of the vehicle 50 steps on the other end of the pedal 40, the link 29 connected to the pedal 40 slides backward to close the slot 21. When the slot 21 is closed, the microwave propagating in the waveguide slot antenna 20 generated by the electromagnetic wave generator 10 is not radiated outside the tube.

  Therefore, according to the fourth embodiment, since the slot 21 of the waveguide slot antenna 20 opens and closes based on the operation of the pedal 40 that is interlocked with the passage of the vehicle 50, the microwave generated by the electromagnetic wave generator 10 is guided. Propagating into the wave tube slot antenna 20 can promptly feed the vehicle 50 with microwaves without depending on the on / off switching time of the electromagnetic wave generator 10. Further, since the slot 21 of the waveguide slot antenna 20 opens and closes based on the operation of the pedal 40 interlocked with the passage of the vehicle 50, power can be supplied only to the section where the vehicle 50 exists. As a result, section power feeding without energy leakage outside the section where the vehicle 50 is present can be realized, so that microwave transmission efficiency and safety are improved.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, although the embodiment of the present invention has been described with reference to a “vehicle” as a specific example of a mobile object that is an object of energy transmission, the mobile object targeted by the mobile energy transmission system according to the present invention is an airplane A ship, a robot, etc. may be sufficient.

  Further, although the embodiment of the present invention has been described with reference to “microwave” as a specific example of the electromagnetic wave for transmitting energy, the electromagnetic wave used for energy transmission by the energy transmission system for a mobile body according to the present invention is an In consideration of interference with the electromagnetic wave, electromagnetic waves in other frequency bands such as infrared rays may be used.

It is a schematic diagram of a microwave energy transmission system. 1 is a schematic diagram of a non-contact power feeding system that feeds power to a moving vehicle. It is a figure showing a 1st embodiment of a non-contact electric supply system concerning the present invention. It is the figure which showed the example of the waveguide slot antenna array in which the some waveguide slot antenna 20 was arranged. It is the figure which showed the electric power feeding system by a coupling slot. 4 is a bottom view of the vehicle 50. FIG. This is an equivalent circuit of a magnetron. It is a figure for demonstrating the opening-and-closing mechanism of the slot 21 of the waveguide slot antenna 20 of 1st Embodiment. FIG. 4 is a diagram for explaining a mode in which a microwave propagating in the waveguide slot antenna 20 is radiated to a vehicle 50 in the first embodiment shown in FIG. 3. It is a figure which shows 2nd Embodiment of the non-contact electric power feeding system which concerns on this invention. It is a figure which shows 3rd Embodiment of the non-contact electric power feeding system which concerns on this invention. It is a figure for demonstrating the opening-and-closing mechanism of the slot 21 of the waveguide slot antenna 20 of 3rd Embodiment. It is the schematic of the lid system which covers the slot 21 with the plate 27 in 3rd Embodiment. It is a figure which shows 4th Embodiment of the non-contact electric power feeding system which concerns on this invention. It is a figure for demonstrating interlocking | linkage of the pedal 40 and the link 29. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnetic wave generator 20 Waveguide slot antenna 21 Slot 22 Moving magnet 23 Fixed magnet 24 Slide stopper 25 Vehicle position detection sensor 26 Motor 27 Plate 28 Belt 29 Link 30 Feeding waveguide 31 Propagation path switcher 40 Pedal 50 Vehicle 51 Power receiving antenna 52 Strong magnet

Claims (6)

A non-contact power feeding system that non-contact feeds a moving body by electromagnetic waves,
A source of the electromagnetic wave;
A waveguide for propagating electromagnetic waves generated from the source to an electromagnetic wave supply point;
Switching means for switching the propagation path of the electromagnetic wave propagating in the waveguide to the electromagnetic wave supply point where the moving body exists ,
A non-contact power feeding system, wherein a slot of the waveguide is opened and closed by a magnet that slides in the waveguide . A position detecting means for detecting the position of the moving body;
The contactless power feeding system according to claim 1, wherein the switching unit switches the propagation path based on a detection result of the position detection unit.   The non-contact power feeding system according to claim 1, wherein the switching unit is an opening / closing unit that opens and closes the waveguide so that an electromagnetic wave in the waveguide can be supplied to a moving body outside the waveguide. .   The non-contact power feeding system according to claim 3, wherein the opening / closing means opens and closes according to a magnetic force relationship between a magnet mounted on the moving body and a magnet installed on the opening / closing means.   The contactless power feeding system according to claim 1, wherein the switching unit switches the propagation path by switching a waveguide toward the electromagnetic wave supply point.   The contactless power supply system according to claim 1, wherein the generation source is a magnetron that generates microwaves.

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