CN110588386A - Coil trolley and wireless charging system for rail vehicle - Google Patents
Coil trolley and wireless charging system for rail vehicle Download PDFInfo
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- CN110588386A CN110588386A CN201810514606.5A CN201810514606A CN110588386A CN 110588386 A CN110588386 A CN 110588386A CN 201810514606 A CN201810514606 A CN 201810514606A CN 110588386 A CN110588386 A CN 110588386A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
The invention provides a coil trolley and a wireless charging system for rail vehicles, wherein the coil trolley comprises: the movable device can move back and forth along a preset track arranged in a groove of the rail vehicle track beam, wherein a primary coil is arranged on the movable device; the driving device is used for driving the movable device to move; and a positioning control device for positioning the rail vehicle when the rail vehicle enters the charging area, and controlling the driving device according to the positioning result of the rail vehicle to drive the movable device to move to a predetermined area below the body underframe of the rail vehicle, so that the primary coil on the movable device is aligned with the secondary coil on the body underframe. The invention can adjust the position of the primary coil according to the relative position of the primary coil and the secondary coil, so that the primary coil and the secondary coil are aligned as much as possible, thereby improving the wireless charging efficiency of the railway vehicle and having the advantages of low cost and high reliability.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a coil trolley and a wireless charging system for a rail vehicle.
Background
With the continuous development of battery technology, how to conveniently and rapidly charge the battery becomes a focus in the industry. Many large-scale enterprises invest in research in the technical field of wireless charging. In addition to Qi, the wireless charging technology Alliance and standards which currently dominate are A4WP and PMA (Power materials Alliance, Power source Alliance), respectively, wherein the main development direction of the Qi standard and the PMA standard is the electromagnetic resonance technology, and the main development direction of the A4WP standard is the magnetic resonance type wireless charging. However, in any technology, the charging power is lower, and at present, the charging power can only meet the requirements of some electric appliances with lower power.
A straddle type monorail is taken as a public transport system, and currently, a contact wire network power supply mode is still adopted mostly. The biggest disadvantages of this power supply method are: due to sliding friction, the contacted power receiving device is seriously worn and needs to be replaced periodically, and the maintenance cost is very high. With the continuous popularization and maturity of new energy technologies, battery power supply gradually advances into the field of rail transit. But as a public transportation system, the charging power and the charging speed are highly required. Traditional battery not only charge efficiency is low, charge time is long, moreover because the track traffic is to the demand of high voltage, leads to the increase of battery festival number to increase rail vehicle dead weight. Therefore, how to realize high-power charging in a short time and reduce the weight of the battery becomes a major obstacle to the application of the battery in the rail field.
In order to solve the problems, a non-contact charging system of a straddle type single-rail transportation rail motor vehicle is provided in the related art, a primary coil is wound on a primary iron core and fixed on a rail beam, a secondary iron core and a coil are fixed on the rail vehicle, positioners are respectively arranged on the primary iron core and the secondary iron core, positioning information is transmitted to a main controller, and the main controller sends a charging instruction to start induction charging.
The transmitting end is arranged on the track beam, the receiving end is arranged at the bottom of the vehicle body, and the electromagnetic resonance principle is adopted, so that the coil is arranged along the track, the laying cost of the line is increased, the complexity of the structure is increased, and larger energy consumption is caused by the line. On the other hand, this mode has a very high requirement for the coil distance, and belongs to the short-distance charging in the wireless charging mode. The straddle type monorail is used as public transport, the ground clearance of the floor surface is easily influenced by the passenger load, generally is not a fixed value, and the improper distance between the primary coil and the secondary coil directly causes low charging efficiency or even no charging, so that the driving efficiency and the safety are influenced. The straddle type monorail serving as a public transport system has strict requirements on charging efficiency, endurance mileage and the like, so that the wireless charging technology is high in development difficulty, high in cost and low in reliability.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
Therefore, an object of the present invention is to provide a coil car, which can adjust the position of a primary coil according to the relative position of the primary coil and a secondary coil, so that the primary coil and the secondary coil are aligned as much as possible, thereby improving the wireless charging efficiency of a rail vehicle, and having the advantages of low cost and high reliability.
Another object of the present invention is to propose a wireless charging system for rail vehicles.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a coil car, including: the movable device can move back and forth along a preset track arranged in a groove of a track beam of the railway vehicle, wherein a primary coil is arranged on the movable device; the driving device is used for driving the movable device to move; the positioning control device is used for positioning the railway vehicle when the railway vehicle enters a charging area, and controlling the driving device according to the positioning result of the railway vehicle to drive the movable device to move to a preset area below a body underframe of the railway vehicle, so that the primary coil on the movable device is aligned with the secondary coil on the body underframe.
According to the coil trolley provided by the embodiment of the invention, the primary coil is arranged on the movable device, when the rail vehicle enters the charging area, the rail vehicle is positioned, the movable device is driven according to the positioning result to drive the primary coil on the movable device to move to the preset area below the underframe of the vehicle body, so that the primary coil and the secondary coil are aligned, even if the overlapping area of the primary coil and the secondary coil is as large as possible, the charging efficiency is effectively improved when the rail vehicle is wirelessly charged, and the coil trolley has the advantages of low cost and high reliability.
In order to achieve the above object, an embodiment of a second aspect of the present invention proposes a wireless charging system for a rail vehicle, including: the coil trolley, the electric energy supply device and the vehicle-mounted charging device are provided with the coil trolley; the vehicle-mounted charging device is used for receiving the electric energy output by the electric energy providing device through the coil trolley when the rail vehicle enters the charging area; the vehicle-mounted charging device is used for receiving the electric energy output by the electric energy providing device through the coil trolley when the rail vehicle enters the charging area; the coil trolley is used for controlling the movable device to move to a preset area below a body chassis of the railway vehicle when the railway vehicle enters the charging area, so that the primary coil on the movable device is aligned with the secondary coil on the body chassis, the primary coil is controlled to be conducted with the electric energy supply device, an electromagnetic field is formed between the primary coil and the secondary coil after the primary coil and the secondary coil are conducted, and electric energy is transmitted to the vehicle-mounted charging device through the electromagnetic field; and the electric energy supply device is used for outputting electric energy to the primary coil.
According to the wireless charging system for the rail vehicle, when the rail vehicle enters the charging area, the coil trolley positions the rail vehicle, moves according to the positioning result, drives the primary coil arranged on the coil trolley to move to the preset area below the underframe of the vehicle body, and enables the primary coil and the secondary coil to be aligned, even if the overlapping area of the primary coil and the secondary coil is as large as possible, the charging efficiency is effectively improved when the rail vehicle is charged wirelessly, and meanwhile, the wireless charging system has the advantages of being low in cost and high in reliability.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a coil car according to one embodiment of the present invention;
fig. 2 is a schematic view of the arrangement direction of the primary coils according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of the overall arrangement of coils according to one embodiment of the present invention;
FIG. 4 is a block diagram of a wireless charging system for rail vehicles according to one embodiment of the present invention;
fig. 5 is an overall structural schematic diagram of a wireless charging system for a railway vehicle according to another embodiment of the present invention;
fig. 6 is a schematic diagram of an arrangement of signal shielding modules according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The coil trolley and the wireless charging system for the rail vehicle according to the embodiment of the invention are described in the following with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a coil car according to an embodiment of the present invention. As shown in fig. 1, the coil carriage includes: a movable device 10, a drive device 20 and a positioning control device 30.
Wherein, as shown in fig. 3, the movable device 10 can move back and forth along a predetermined track 2 provided in a groove of a rail vehicle track beam 5, wherein the movable device 10 is provided with a primary coil 1, as shown in fig. 1.
In the specific example shown in connection with fig. 3, the rail vehicle rail beam 5 is for example a C-beam comprising one groove. The middle groove of the road section in the non-stop station can be used as an escape passage, and the station road section is used as a charging road section. In order to realize the wireless charging function with the maximum efficiency, the coil trolley paved with the primary coil 1 is arranged in the groove of the track beam, and the shielding wire nets are arranged on the two sides of the groove, so that the magnetic field can not interfere with other equipment. Further, the coil carriage can move back and forth along a predetermined track 2 in the groove. When the parking position of the rail vehicle is not accurate, automatic positioning correction can be carried out, and the maximum facing area of the primary coil 1 and the secondary coil 310 arranged on the vehicle body underframe 4 is ensured, so that the charging efficiency is increased.
Specifically, as shown in fig. 3, the primary coil 1 is formed by connecting a plurality of coils in series and is disposed on a first surface of the coil car, the first surface being a surface facing the underframe 4 of the railway vehicle body. Specifically, the primary coil 1 is laid on the first surface of the movable device 10, so that the secondary coil 310 located on the body frame 4 is aligned with the primary coil 1 on the first surface when the rail vehicle arrives, thereby improving wireless charging efficiency when charging. In order not to affect the driving safety, the laying length of the primary coil 1 along the line does not exceed the length of the rail vehicle.
The driving device 20 is used for driving the movable device 10 to move. That is, the driving device 20 is used to provide a driving force to drive the movable device 10 to move along the predetermined track 2 thereof, so as to drive the primary coil 1 on the movable device 10 to move, thereby adjusting the relative positions of the primary coil 1 and the secondary coil 310, and aligning the primary coil 1 and the secondary coil 310 as much as possible, thereby improving the wireless charging efficiency.
The positioning control device 30 is used for positioning the rail vehicle when the rail vehicle enters the charging area, and controlling the driving device 20 according to the positioning result of the rail vehicle to drive the movable device 10 to move to a preset area below the body underframe 4 of the rail vehicle, so that the primary coil 1 on the movable device 10 is aligned with the secondary coil 310 on the body underframe 4, and the facing area of the two coils is maximized.
Wherein, the charging area is arranged in the station. That is, after the rail vehicle enters and stops at the charging area, which indicates that the rail vehicle needs to be charged, the positioning control device 30 positions the rail vehicle to obtain the relative positions of the primary coil 1 and the secondary coil 310, and then controls the driving device 20 according to the relative positions of the primary coil 1 and the secondary coil 310, and the driving device 20 drives the movable device 10 to move on the predetermined track 2, specifically, to a predetermined area under the body underframe 4 of the rail vehicle, in which the primary coil 1 on the movable device 10 is aligned with the secondary coil 310 on the body underframe 4, that is, the overlapping area of the two is as large as possible, so that the wireless charging efficiency of the rail vehicle can be effectively improved.
In the specific example, the positioning control device 30 includes, for example, a first positioning sensor provided on the vehicle body under frame 4 and a second positioning sensor provided on the coil car. When the rail vehicle enters the station and stops, the relative position between the primary coil 1 and the secondary coil 310 is obtained through the combination of the first positioning sensor and the second positioning sensor, so that the rail vehicle is accurately positioned.
Further, as shown in fig. 1, the coil car further includes a traction device 40. The pulling device 40 is used for connecting the next coil trolley. Specifically, in order to increase the charging power as much as possible, a coil trolley is correspondingly arranged under each carriage of the railway vehicle, namely, a coil is paved under each carriage, and a plurality of coil trolleys are connected through the traction device 40, so that the structural stability of the whole railway vehicle is improved, and the railway vehicle is convenient to manage and position. On the other hand, in order to reduce the technical cost, the primary coils 1 corresponding to each car are connected in series. Furthermore, in order to utilize the space in the largest area, the primary coil 1 is shaped as a rectangle and horizontally disposed on the first surface of the coil carriage, and correspondingly, the secondary coil 310 is also shaped as a rectangle and horizontally disposed on the body chassis 4, so as to facilitate alignment with the primary coil 1.
Further, as shown in fig. 2, the coil car further includes a magnetic conducting device 50. The magnetic conduction device 50 is arranged at the center of the primary coil 1, and the axis of the magnetic conduction device 50 is parallel to the axis of the primary coil 1. The magnetic conductive device 50 has high magnetic conductivity, such as an iron core, which can improve the transmission efficiency of energy and reduce the energy waste caused by magnetic leakage. For example, the primary coils 1 connected in series are arranged horizontally on a coil carriage in a track beam groove. And a cuboid iron core is arranged at the center of each primary coil 1 and welded on the plane of the coil trolley. This is because when the primary coil 1 is energized, a changing magnetic field will be generated in the vicinity of the primary coil 1. However, the magnetic field direction is in an emission state, and in order to guide the magnetic field direction and realize the maximum energy conversion, in the embodiment of the present invention, an iron core is arranged at the center of each primary coil 1, and because the iron core has high magnetic permeability, the direction of the magnetic field generated by the primary coil 1 can be ensured to be in the vertical direction as much as possible, so that the energy transmission efficiency is improved, and the energy waste caused by magnetic leakage is reduced.
In a specific example, the main workflow of the coil trolley when the rail vehicle is charged wirelessly can be summarized as follows: when the rail vehicle drives into the charging area, the positioning control device 30 on the coil trolley can accurately position the rail vehicle, and control the driving device 20 according to the positioning result to drive the movable device 10 to move, including the moving direction and the moving distance, so as to drive the primary coil 1 to move to the predetermined area, align the primary coil 1 and the secondary coil 310, maximize the facing area, and facilitate the improvement of the charging efficiency. After the coil trolley is positioned, the controller of the station controls a power supply circuit in the station to conduct connection between the transmitting device and the power grid equipment. The primary coil 1 on the coil trolley is powered by power grid equipment in a station, and converts direct current into alternating current with certain high frequency by using an oscillator, and meanwhile, a magnetic field with certain frequency is generated, and electric energy is converted into magnetic field energy. The secondary coil 310 on the rail vehicle also generates an electromagnetic field at a vibration frequency when externally excited. When the secondary coil 310 mounted on the rail vehicle resonates at the same electromagnetic frequency as the primary coil 1 outputs, energy transfer can be performed by the magnetic field. After receiving the electric energy of transmitting terminal, the receiving device is handled through the converter, stores the energy received in super capacitor or energy storage battery to supply rail vehicle driving to use after through distribution conversion, thereby realize quick wireless charging technique.
In conclusion, the charging area is arranged in the station, so that the management and the control are convenient, the power is supplied in a centralized manner, the line cost is reduced, and the energy loss of the current in the transmission process is reduced. In addition, the arrangement at the station can fully utilize the time of passengers getting on and off the railway vehicle for charging, and the dynamic stability and the punctuality of the railway vehicle are not influenced.
On the other hand, the primary coil 1 is arranged on the coil trolley, the positioning control device capable of automatically positioning and identifying is arranged on the trolley, when the rail vehicle drives into a charging area, the coil trolley can move back and forth within a certain range to accurately position the rail vehicle, so that the area opposite to the primary coil 1 and the secondary coil 310 is ensured to be the largest, and the wireless charging efficiency is improved.
Further, in order to reduce more energy loss due to leakage flux, a magnetic conductive device is disposed at the center of the primary coil 1, for example, a core is vertically disposed at the center of each of the coils connected in series, thereby improving energy transmission efficiency.
According to the coil trolley provided by the embodiment of the invention, the primary coil is arranged on the movable device, when the rail vehicle enters the charging area, the rail vehicle is positioned, the movable device is driven according to the positioning result to drive the primary coil on the movable device to move to the preset area below the underframe of the vehicle body, so that the primary coil and the secondary coil are aligned, even if the overlapping area of the primary coil and the secondary coil is as large as possible, the charging efficiency is effectively improved when the rail vehicle is wirelessly charged, and the coil trolley has the advantages of low cost and high reliability.
Further embodiments of the present invention also provide a wireless charging system for a rail vehicle.
Fig. 4 is a block diagram of a wireless charging system for rail vehicles according to one embodiment of the present invention. As shown in fig. 4, the wireless charging system 1000 for a railway vehicle includes: the coil car 100, the power supply device 200 and the vehicle-mounted charging device 300.
The vehicle-mounted charging device 300 is configured to receive the electric energy output by the electric energy providing device 200 through the coil car 100 when the rail vehicle enters the charging area.
The coil car 100 is, for example, the coil car described in any of the above embodiments of the present invention. The vehicle-mounted charging device 300 is used for controlling the movable device to move to a preset area below the underframe of the railway vehicle body when the railway vehicle enters the charging area, so that the primary coil on the movable device is aligned with the secondary coil on the underframe of the railway vehicle body, and after the primary coil is conducted with the power supply device 200, an electromagnetic field is formed between the primary coil and the secondary coil, and power is transmitted to the vehicle-mounted charging device 300 through the electromagnetic field, so that the charging efficiency can be improved.
The power supply device 200 is used to output power to the primary coil.
That is, when the rail vehicle enters the charging area for charging, the coil car 100 positions the rail vehicle, obtains the relative positions of the primary coil and the secondary coil, then the driving device is controlled accordingly to drive the movable device to move, so that the primary coil positioned on the movable device moves to a preset area under the underframe of the vehicle body, in the predetermined region, the primary coil is aligned with the secondary coil on the underframe of the car body, and the facing area of the primary coil and the secondary coil is maximized, so that, when the primary coil and the power supply device 200 are turned on, the power supply device 200 outputs power to the primary coil, after the primary coil is electrified, an electromagnetic field is formed between the primary coil and the secondary coil, electric energy is transmitted to the secondary coil through the electromagnetic field by utilizing the principle of electromagnetic resonance, therefore, electric energy transmission of the vehicle-mounted charging device 300 is achieved, and rapid and efficient charging of the rail vehicle is achieved.
Further, as shown in fig. 5, the in-vehicle charging device 300 includes: a secondary coil 310, an on-board charger 320, and an energy storage unit 330. The secondary coil 310 is configured to form an electromagnetic field with the primary coil 1 after the primary coil 1 is conducted with the power supply device 200, and obtain power from the primary coil 1 through the electromagnetic field to charge the vehicle-mounted charger 320. The on-board charger 320 is used for obtaining power from the secondary coil 310 and inputting the power to the energy storage unit 330 for storage. The energy storage unit 330 is configured to receive and store the electric energy output by the on-board charger 320, so as to be used for the rail vehicle to run. The energy storage unit 330 is, for example, a super capacitor, and has the advantages of fast charging speed, strong large-current discharging capability, and the like, so that the station-stopping fast charging can be realized, and the electric energy from the point energy supply device 200 is stored to the maximum extent for the running of the rail vehicle. In addition, the supercapacitor does not have an influence on the weight of the rail vehicle.
Further, the in-vehicle charging device 300 further includes: rectifiers (not shown) connected to the on-board charger 320 and the energy storage unit 330, respectively. The rectifier is configured to perform rectification and transformation processing on the electric energy output by the vehicle-mounted charger 320, and input the electric energy after the rectification and transformation processing into the energy storage unit 330.
Further, as shown in fig. 5, the in-vehicle charging device 300 further includes: a signal transmitter 340. The signal transmitter 340 is disposed on the rail vehicle, for example, on the vehicle head, and is configured to transmit a charging request signal to the outside when the rail vehicle enters the charging area, so that the signal receiver on the coil car 100 detects the charging request signal and determines that the rail vehicle enters the charging area. That is, when the rail vehicle enters the charging area, a charging request signal is sent out to indicate that charging is required, and the signal receiver arranged on the coil car 100 detects the charging request signal, and then confirms that the rail vehicle enters the charging area, so as to start positioning the rail vehicle.
Further, as shown in fig. 5, the power supply device 200 includes: the signal receiver 210, the controller 220 and the power grid equipment 230, wherein the signal receiver 210 is connected with the controller 220, and the controller 220 is connected with the power grid equipment 230. The signal receiver 210 is configured to detect the charging request signal, and send a positioning instruction to the coil car 100 after detecting the charging request signal, so that the positioning control device of the coil car 100 positions the rail vehicle. The controller 220 is configured to control the power grid device 230 to output power to the primary coil 1 upon receiving the charging request signal. In other words, when the signal receiver 210 receives the charging request signal, it indicates that the rail vehicle enters the charging area to wait for charging, at this time, a positioning instruction is sent to the coil trolley 100, the coil trolley 100 positions the rail vehicle according to the positioning instruction, and adjusts the relative positions of the primary coil 1 and the secondary coil according to the positioning result, so as to finally maximize the opposite surfaces of the primary coil 1 and the secondary coil, the controller 220 controls the power grid device 230 to be conducted with the primary coil 1 to provide electric energy for the primary coil 1, and thus, the rail vehicle is rapidly charged through the primary coil 1 and the secondary coil.
Further, the power supply apparatus 200 further includes, for example, a grid equipment switch (not shown in the figure). The grid device switch is used to connect the primary coil 1 and the grid device 230. And the controller 220 is configured to, upon receiving the charging request signal, control the grid device switch to close, so that the grid device 230 is conducted with the primary coil 1, and output the electric energy to the primary coil 1. That is, a grid device switch is provided between the grid device 230 and the primary coil 1 to turn on or off the grid device 230 and the primary coil 1. When the controller 220 receives the charging request signal, which indicates that the rail vehicle has entered the charging area to wait for charging at this time, the controller 220 controls the power grid device switch to be closed, so that the primary coil 1 and the power grid device 230 are switched on, the power grid device 230 supplies power to the secondary coil, and the primary coil 1 and the secondary coil are combined to rapidly and efficiently charge the rail vehicle.
Further, the signal transmitter 340 is also used for transmitting a charging stop signal when the rail vehicle leaves the charging area. The signal receiver 210 is further configured to detect a charging stop signal, and send a charging stop instruction to the controller 220 when the charging stop signal is detected, so that the controller 220 controls the grid device 230 to stop outputting power to the primary coil 1. Specifically, after the rail vehicle is charged, the rail vehicle needs to leave the charging area, at this time, the signal transmitter 340 transmits a charging stop signal, the signal receiver 210 located at the station receives the charging stop signal and then transmits a charging stop instruction to the controller 220, the controller 220 controls the switch of the grid equipment to be turned off, so that the grid equipment 230 is disconnected from the primary coil 1, and the electric energy output to the primary coil 1 is stopped, thus, the charging process of the rail vehicle is stopped, and after the power is cut off, the rail vehicle can leave, so that the charging safety is ensured.
Further, as shown in fig. 5, the power supply apparatus 200 further includes: a converter 240 and an oscillator 250. The converter 240 is connected to the grid device 230 and the oscillator 250, respectively, and is configured to convert the ac power from the grid device 230 into dc power for transmission to the oscillator 250. The oscillator 250 is used to convert the direct current into an alternating current of a first preset frequency to power the primary coil 1. For example, after the grid device switch is turned on, the converter 220 (e.g., AC/DC) converts the AC voltage received from the grid device into a DC voltage through rectification and filtering, and transmits the DC voltage to the oscillator 250; on the other hand, the ac voltage may be integrated into the dc voltage in advance and directly supplied to the oscillator 250. Further, the converted dc voltage is inputted into the oscillator 250, and the oscillator 250 converts the dc voltage into an ac voltage of a high frequency (i.e., a first preset frequency) according to a preset frequency requirement. In an embodiment of the present invention, oscillator 250 is, for example, a harmonic oscillator.
Further, as shown in fig. 5, the power supply apparatus 200 further includes: a power amplifier 260. The power amplifier 260 is connected to the oscillator 250, and is configured to power-amplify the alternating current of the first preset frequency, so that the primary coil 1 outputs the electromagnetic wave of the second preset frequency, thereby increasing the charging power.
Further, as shown in fig. 5, the power supply apparatus 200 further includes: an impedance matching circuit 270. The impedance matching circuit 270 is connected to the primary coil 1 and the secondary coil 310, respectively, and is configured to match a frequency of the electromagnetic wave output from the primary coil 1 with a frequency of the electromagnetic wave output from the secondary coil 310, and allow the primary coil 1 to transmit electric power to the secondary coil 310 when the frequency of the electromagnetic wave output from the primary coil 1 and the frequency of the electromagnetic wave output from the secondary coil 310 coincide with each other. Specifically, after the primary coil 1 and the secondary coil are aligned, the primary coil 1 generates an electromagnetic field after being energized, and generates vibration, the secondary coil also generates an electromagnetic field with a certain vibration frequency after receiving the vibration excitation of the primary coil 1, the impedance matching circuit 270 matches the electromagnetic frequency output by the two-stage coil, and when the electromagnetic frequencies output by the primary coil 1 and the secondary coil are consistent, energy transmission from the primary coil 1 to the secondary coil can be performed, and electric energy transmission is realized.
Further, as shown in fig. 6, the wireless charging system 1000 for a railway vehicle further includes: a signal masking module 280. The signal shielding modules 280 are disposed at both sides of the groove of the rail vehicle track beam 12 for shielding magnetic field interference during power transmission. For example, the signal shielding module 280 is, for example, a signal shielding net disposed on two sides of the rail beam 12 of the rail vehicle, so that the range of signal shielding can be effectively increased, and further it can be better ensured that the intensity and direction of the magnetic field are not changed during the charging process, and the energy of the electric energy providing device 200 is transmitted to the vehicle-mounted charging device 300 to the greatest extent, thereby avoiding signal interference from generating a magnetic leakage phenomenon, resulting in energy attenuation, and thus effectively saving energy and avoiding waste.
In summary, the charging process of the wireless charging system for rail vehicles can be summarized as follows: a primary coil is laid on the coil trolley and connected to power grid equipment through a power grid equipment switch, a secondary coil is laid on a vehicle body underframe, a signal transmitter is arranged on a railway vehicle, a signal receiver is arranged on the vehicle, and a controller controls a charging process according to related signals. Specifically, when the rail vehicle enters the charging area, the signal transmitter sends a charging request signal to the signal receiver, the signal receiver sends a positioning instruction to the coil trolley, and the coil trolley carries out accurate positioning on the rail vehicle according to the positioning instruction, controls the moving direction and the moving distance of the movable device and realizes alignment of the primary coil and the secondary coil. And after the coil trolley is positioned, the controller controls the switch of the power grid equipment to be closed so as to conduct the connection between the power grid equipment and the primary coil. The primary coil on the coil trolley is powered by power grid equipment in a station, direct current is converted into alternating current with certain high frequency by using the oscillator, meanwhile, a magnetic field with certain frequency is generated, and electric energy is converted into magnetic field energy. The secondary coils on the rail vehicle are also excited externally to generate electromagnetic fields at a certain vibration frequency. When the secondary coil mounted on the rail vehicle resonates at the same electromagnetic frequency as the primary coil, energy transfer can be achieved by the magnetic field. After the vehicle-mounted charger receives the transmitted electric energy, the received energy is stored in the super capacitor or the energy storage battery after being rectified and transformed, and the received energy is supplied to the rail vehicle for running after being converted through power distribution, so that a quick wireless charging technology is realized.
It should be noted that, a specific implementation manner of the coil trolley included in the wireless charging system for a rail vehicle according to the above embodiment of the present invention is similar to the specific implementation manner of the coil trolley described in the first embodiment of the present invention, and reference is specifically made to the foregoing description of the coil trolley, and in order to reduce redundancy, details are not repeated here.
According to the wireless charging system for the rail vehicle, when the rail vehicle enters the charging area, the coil trolley positions the rail vehicle, moves according to the positioning result, drives the primary coil arranged on the coil trolley to move to the preset area below the underframe of the vehicle body, and enables the primary coil and the secondary coil to be aligned, even if the overlapping area of the primary coil and the secondary coil is as large as possible, the charging efficiency is effectively improved when the rail vehicle is charged wirelessly, and meanwhile, the wireless charging system has the advantages of being low in cost and high in reliability.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (18)
1. A coil trolley, comprising:
the movable device can move back and forth along a preset track arranged in a groove of a track beam of the railway vehicle, wherein a primary coil is arranged on the movable device;
the driving device is used for driving the movable device to move;
the positioning control device is used for positioning the railway vehicle when the railway vehicle enters a charging area, and controlling the driving device according to the positioning result of the railway vehicle to drive the movable device to move to a preset area below a body underframe of the railway vehicle, so that the primary coil on the movable device is aligned with the secondary coil on the body underframe.
2. The coil car as set forth in claim 1, further comprising:
and the traction device is used for connecting the next coil trolley.
3. The coil trolley according to claim 1 or 2, further comprising:
and the magnetic conduction device is arranged in the center of the primary coil, and the axis of the magnetic conduction device is parallel to the axis of the primary coil.
4. The coil trolley according to claim 1 or 2, wherein the primary coil is formed by connecting a plurality of coils in series and is arranged on a first surface of the coil trolley, and the first surface is a surface facing to the underframe of the body of the railway vehicle.
5. The coil trolley according to claim 1, wherein the charging area is provided in a station.
6. A wireless charging system for a rail vehicle, comprising:
the coil trolley, the power supply device and the vehicle-mounted charging device according to any one of claims 1 to 5;
the vehicle-mounted charging device is used for receiving the electric energy output by the electric energy providing device through the coil trolley when the rail vehicle enters the charging area;
the coil trolley is used for controlling the movable device to move to a preset area below a body chassis of the railway vehicle when the railway vehicle enters the charging area, so that the primary coil on the movable device is aligned with the secondary coil on the body chassis, and after the primary coil is conducted with the electric energy supply device, an electromagnetic field is formed between the primary coil and the secondary coil, and electric energy is transmitted to the vehicle-mounted charging device through the electromagnetic field;
and the electric energy supply device is used for outputting electric energy to the primary coil.
7. The wireless charging system for rail vehicles according to claim 6, wherein the on-board charging device comprises: the secondary coil, the vehicle-mounted charger and the energy storage unit;
the secondary coil is used for forming an electromagnetic field with the primary coil after the primary coil is conducted with the electric energy providing device, acquiring electric energy from the primary coil through the electromagnetic field and charging the vehicle-mounted charger;
the vehicle-mounted charger is used for acquiring electric energy from the secondary coil and inputting the electric energy into the energy storage unit for storage;
and the energy storage unit is used for receiving and storing the electric energy output by the vehicle-mounted charger.
8. The wireless charging system for rail vehicles according to claim 7, wherein the on-board charging device further comprises:
the rectifier is connected with the vehicle-mounted charger and the energy storage unit respectively;
the rectifier is used for carrying out rectification transformation processing on the electric energy output by the vehicle-mounted charger and inputting the electric energy subjected to rectification transformation processing into the energy storage unit.
9. The wireless charging system for rail vehicles according to claim 7 or 8, characterized in that the energy storage unit is a super capacitor.
10. The wireless charging system for rail vehicles according to claim 7, wherein the on-board charging device further comprises:
and the signal transmitter is arranged on the rail vehicle and is used for sending a charging request signal outwards when the rail vehicle enters a charging area, so that the signal receiver on the coil trolley detects the charging request signal and determines that the rail vehicle enters the charging area.
11. The wireless charging system for rail vehicles according to claim 10, wherein the electric energy supply device comprises: the system comprises a signal receiver, a controller and a power grid device;
the signal receiver is used for detecting the charging request signal, and sending a positioning instruction to the coil trolley after the charging request signal is detected so that the positioning control device of the coil trolley can position the rail vehicle;
and the controller is used for controlling the power grid equipment to output electric energy to the primary coil after receiving the charging request signal.
12. The wireless charging system for rail vehicles according to claim 11, wherein the electric energy supply device further comprises:
and the power grid equipment switch is used for connecting the primary coil and power grid equipment.
13. The wireless charging system for rail vehicles according to claim 12,
and the controller is used for controlling the switch of the power grid equipment to be closed after receiving the charging request signal, so that the power grid equipment is conducted with the primary coil, and electric energy is output to the primary coil.
14. The wireless charging system for rail vehicles according to claim 13, wherein the electric energy supply device further comprises: a converter and an oscillator;
the converter is respectively connected with the power grid equipment and the oscillator and is used for converting alternating current from the power grid equipment into direct current and transmitting the direct current to the oscillator;
the oscillator is used for converting the direct current into alternating current with a first preset frequency so as to supply power to the primary coil.
15. The wireless charging system for rail vehicles according to claim 14, wherein the electric energy supply device further comprises:
and the power amplifier is connected with the oscillator and used for performing power amplification on the alternating current with the first preset frequency so as to enable the primary coil to output electromagnetic waves with a second preset frequency.
16. The wireless charging system for rail vehicles according to claim 15, wherein the electric energy supply device further comprises:
and the impedance matching circuit is respectively connected with the primary coil and the secondary coil and is used for matching the frequency of the electromagnetic wave output by the primary coil with the frequency of the electromagnetic wave output by the secondary coil and allowing the primary coil to transmit electric energy to the secondary coil when the frequency of the electromagnetic wave output by the primary coil is consistent with the frequency of the electromagnetic wave output by the secondary coil.
17. The wireless charging system for rail vehicles according to claim 11,
the signal transmitter is further used for transmitting a charging stopping signal when the rail vehicle leaves the charging area;
the signal receiver is further configured to detect the charging stop signal, and send a charging stop instruction to the controller after the charging stop signal is detected, so that the controller controls the power grid device to stop outputting electric energy to the primary coil.
18. The wireless charging system for rail vehicles according to claim 6, further comprising:
and the signal shielding modules are arranged on two sides of the groove of the rail vehicle track beam and used for shielding magnetic field interference in the electric energy transmission process.
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| CN201810514606.5A CN110588386A (en) | 2018-05-25 | 2018-05-25 | Coil trolley and wireless charging system for rail vehicle |
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| CN201810514606.5A CN110588386A (en) | 2018-05-25 | 2018-05-25 | Coil trolley and wireless charging system for rail vehicle |
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