CN203562847U - Electromagnetic resonant type wireless power supply system used for subway - Google Patents
Electromagnetic resonant type wireless power supply system used for subway Download PDFInfo
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- CN203562847U CN203562847U CN201320723728.8U CN201320723728U CN203562847U CN 203562847 U CN203562847 U CN 203562847U CN 201320723728 U CN201320723728 U CN 201320723728U CN 203562847 U CN203562847 U CN 203562847U
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Abstract
The utility model relates to an electromagnetic resonant type wireless power supply system used for a subway. The electromagnetic resonant type wireless power supply system mainly comprises a power supply unit (1), a rectification filtering module (2), a chopper power oscillation circuit (3), a signal control module (4), an electromagnetic field transmitting line (5), an electromagnetic field receiving coil (6), a rectification filtering chopper module (7), an inversion module (8), a locomotive (9) and an electromagnetic field shielding body (11). According to the electromagnetic resonant type wireless power supply system, the transmission mode of electric energy is developed, a safer subway power supply mode is designed, the original friction between a pantograph and a transmission line is eliminated, the danger of the contact rail power supply mode for overhauling personnel and passengers is avoided, and the maintenance cost of the subway in operation is reduced. According to the electromagnetic resonant type wireless power supply system, the construction is convenient, the power supply system can be realized only by reconstruction of the conventional subway lines and locomotives, the cost is relatively low compared with other wireless power supply structures, the structure is stable and reliable, the security is high, and the market prospect is wide.
Description
Technical field
Wireless power transmission technology is one of most active hot research direction in current electrical engineering field, it integrates basic research and application study, be that of exploring of the outer academia of Present Domestic and industrial quarters is multidisciplinary, new research field and the advanced subject of strong intersection, contain many technical fields such as electromagnetic field, power electronic technology, electric power system, control technology, physics, materialogy, information technology.Adopt wireless power mode can effectively overcome all kinds of defects that electric wire connected mode exists, realize freely powering of electronic apparatus, there is important application expection and vast potential for future development.
The utility model relates to a kind of easy construction for the electromagnetic resonance formula wireless power supply system of subway, and the wireless power transmission electromagnetic resonance coupling technique that system is convenient, stable, safe and reliable, for the wireless power of subway provides technology model.Avoided the drawback of existing subway power supply pattern, eliminate the friction between original pantograph and power transmission line, also the danger of having avoided conductor rail supply power mode to bring staff, reduce the maintenance cost that subway is in operation, reduce the impact of the air drag being brought by pantograph on car body operational efficiency, and market prospects are wide simultaneously.
Background technology
Wireless power transmission technology can be divided into three kinds: the first is inductive coupling type electric energy transmission, it utilizes loosely coupled transformer principle to pass can, generally there is the iron core apparatus that reduces loop magnetic resistance in transmitting terminal and receiving terminal, is applicable to small-power, short-range application scenario.The second is electromagnetic coupled resonant mode delivery of electrical energy, is applicable to the Energy Transfer of moderate distance by inductance on the resonator of high quality factor and distributed capacitor generation resonance transmitting energy.The third is electromagnetic radiation formula delivery of electrical energy, and in this technology, electric energy is converted into microwave form, and transmission range exceedance km, can realize the teletransmission of electric energy.Wherein electromagnetic coupled harmonic technology utilizes non-radiative electromagnetic field near-field region to complete delivery of electrical energy, than induction biography energy, has had very large expansion in transmission range on the one hand; Compare on the other hand electromagnetic radiation formula and pass energy, near-field region energy has radiationless feature, and this technology has good fail safe, therefore obtains at present very large concern and research.
Subway power supply can be divided into two kinds at present: be respectively two kinds of forms of overhead contact line and conductor rail, adopt the circuit of AC25kV or DC1500V to use contact line standard, contact line cost is high, especially three rail contact lines, basic dependence on import, in addition which needs subway train that pantograph is installed, come in contact acquisition electric energy with contact line, but the carbon plate of pantograph is due to serious wear, need often to change carbon plate, troublesome poeration and maintenance cost are large, it is larger that while which is affected by high-altitude foreign matter, for example house refuse, polybag is pounded on roof, hang on contact line, be entangled in pantograph, the normal operation of train is disturbed in capital, cause the temporary parking of train, and pass to 750V direct current on the rail that at present popular DC750V conductor rail power supply form is started at train, this brings very big danger can to the staff of maintenance at the bottom of car, in addition existing underground railway track can not shield completely, the passenger of railway platform of falling owing to slipping has the sorrow of life especially, because the unexpected conductor rail of touching causes clicking dead passenger also have report in news.Therefore the later stage operation maintenance and the safeguard protection problem that how to solve subway are very urgent.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of electromagnetic resonance formula wireless power supply system for subway has been proposed, the existence of pantograph in traditional subway supply power mode and the friction with current supply line have been avoided, overcome conventional locomotive supply power mode and need to regularly replace pantograph and the supply line severe drawback of wearing and tearing, also avoided conductor rail power supply form is the potential safety hazard that maintainer and the passenger that slips bring simultaneously, also reduced subway power supply because the probability of the interim stoppage in transit that the short circuit that foreign matter causes causes, for the wireless power of subway provides safety and stability, concrete tangible technology model.
The technical scheme that the utility model adopts is: for the electromagnetic resonance formula wireless power supply system of subway, be provided with power subsystem (1), for electric power system provides input power; Rectification filtering module (2), is transformed into direct current by the alternating current of power subsystem input; Copped wave power oscillating circuit (3), for being converted to the direct current of rectification filtering module input to adapt to the alternating current that bearing power requires; Signal controlling module (4), controls the output voltage values of chopper circuit to realize the balance of input power and power output; Electromagnetic field emissions circuit (5), the alternating electromagnetic field producing for launching copped wave power oscillating circuit; Electromagnetic field receiving coil (6), receives the alternating magnetic field that electromagnetic field emissions circuit is launched; Rectifying and wave-filtering copped wave module (7), the alternating current that electromagnetic field receiving coil is received is converted to the constant direct current of magnitude of voltage; Inversion module (8), the direct current that rectifying and wave-filtering copped wave module is exported is modulated into the alternating current of required frequency, for locomotive (9) provides driving power; Electro-magnetic screen layer (11), by unnecessary magnetically confined therein, reduces the generation of eddy current loss.
Described rectification filtering module (2) is comprised of bridge rectifier and filter circuit two parts, rectifying part utilizes the high-power bridge circuit of IGBT composition that alternating current is become to direct current, filtering part is connected between rectification circuit territory copped wave power oscillating circuit simultaneously, in order to Eliminate highter harmonic, the direct current of output constant voltage.
Described copped wave power oscillating circuit (3) is comprised of chopper circuit and half-bridge power push-pull circuit, wherein chopper circuit is subject to Single-chip Controlling in signal control circuit (4), to control its output voltage values, the switching frequency of half-bridge power push-pull circuit is fixed, consistent with the resonance frequency of transmitting circuit.
Described signal control circuit (4) is comprised of power-sensing circuit and single chip machine controlling circuit.The power signal that power-sensing circuit detects converts and delivers to single chip machine controlling circuit through A/D, and single-chip microcomputer will compare with the power threshold prestoring, and regulates the output voltage index of chopper circuit in (3) according to comparative result.
Described electromagnetic field emissions circuit (5) is comprised of the metallic conductor of additional insulating barrier, be embedded in underground engines under, its resonance frequency and supply frequency are consistent, to guarantee lower reflection coefficient, and the alternating electromagnetic field producing for launching copped wave power oscillating circuit.
The coil that described electromagnetic field receiving coil (6) is turned to by multiturn metallic conductor forms, be arranged on locomotive under, receiving coil has just been considered the frequency of power supply when making, receiving coil and the supply frequency produced are consistent, to guarantee the receiving coil maintenance resonance condition that is in operation, in the mode being coupled by resonance, realize the efficient transmission of energy.
Described rectifying and wave-filtering copped wave module (7) is comprised of bridge rectifier, filter circuit, chopper circuit, the AC rectification that wherein bridge rectifier obtains coil becomes direct current, filter circuit is eliminated the high order harmonic component in circuit, and chopper circuit is transformed into filtered direct current the direct current of constant output voltage subsequently.
Described inversion module (8) is comprised of power frequency inverter circuit, and the alternating current that is transformed into required frequency for the direct current that (7) are exported is to offer the load of rear class locomotive.
The utility model is for the electromagnetic resonance formula wireless power supply system of subway, to adopt power subsystem (1), rectification filtering module (2), copped wave power oscillating circuit (3), signal controlling module (4), electromagnetic field emissions coil (5), electromagnetic field receiving coil (6), rectifying and wave-filtering copped wave module (7), the electric power system of inversion module (8) and locomotive load (9) composition, in addition this system has also selected electro-magnetic screen layer (11) to design electromagnetic armouring structure, reduced the dissipation of electromagnetic energy at the bottom of rail and car, reduced the impact of electromagnetic wave on environment, improved the energy transmission efficiency of system.System has been avoided the existence of pantograph in traditional subway contact line supply power mode and the high-speed friction with current supply line, overcome conventional locomotive supply power mode and need to regularly replace pantograph and the supply line severe drawback of wearing and tearing, also avoided conductor rail power supply form is the potential safety hazard that maintainer and the passenger that slips bring simultaneously, also reduced subway power supply because the probability of the interim stoppage in transit that the short circuit that foreign matter causes causes, for the wireless power of subway provides safety and stability, concrete tangible technology model, also for the application of radio energy-transmitting technology provides sample.
Accompanying drawing explanation
Fig. 1 is allomeric function block diagram of the present utility model;
Fig. 2 is transmitter unit structural representation;
Fig. 3 is the structure chart of electromagnetism receiving coil;
Fig. 4 is the structure chart of electromagnetic emission circuit;
Fig. 5 is schematic diagram at the bottom of the car with electromagnetic shielding.
Wherein:
10: electromagnetic field emissions circuit 11: electro-magnetic screen layer
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is made and being explained for the electromagnetic resonance formula wireless power supply system of subway.
As shown in Figure 1, the utility model, for the electromagnetic resonance formula wireless power supply system of subway, is provided with power subsystem (1), for electric power system provides input power; Rectification filtering module (2), is transformed into direct current by the alternating current of power subsystem input; Copped wave power oscillating circuit (3), for being converted to the direct current of rectification filtering module input to adapt to the alternating current that bearing power requires; Signal controlling module (4), is comprised of power-sensing circuit and single chip machine controlling circuit.The power signal that power-sensing circuit detects converts and delivers to single chip machine controlling circuit through A/D, single-chip microcomputer will compare with the power threshold prestoring, according to comparative result, regulate the output voltage index of chopper circuit in (3), control the output voltage values of chopper circuit to realize the balance of input power and power output, in this example, default copped wave output voltage values is 750V, power threshold is 2560kW, and magnitude of voltage and power threshold can be made adjustment according to requiring, electromagnetic field emissions circuit (5), the alternating electromagnetic field producing for launching copped wave power oscillating circuit, this circuit was measured natural resonance frequency before using after setting up, and mate with the centre frequency of power subsystem (1) by shunt capacitance, transmitting circuit (5) resonance frequency after coupling is consistent with the centre frequency of power subsystem (1), to guarantee lower reflection coefficient, electromagnetic field receiving coil (6), receive the alternating magnetic field that electromagnetic field emissions circuit is launched, this coil mates with power subsystem (1) and transmitting circuit (5) before use, matching way is to compare according to the frequency of the own resonance frequency of circuit and power subsystem (1) and transmitting circuit (5), pass through shunt capacitance, the own resonance frequency of coil and the centre frequency of power supply are consistent, to realize the resonant mode power supply of system, in addition, the receiving coil series connection rear access rectifying and wave-filtering copped wave module (7) that train bottom is all, rectifying and wave-filtering copped wave module (7), the alternating current that electromagnetic field receiving coil is received is converted to the constant direct current of magnitude of voltage, inversion module (8), the direct current that rectifying and wave-filtering copped wave module is exported is modulated into the alternating current of required frequency, for locomotive (9) provides driving power.
As shown in Figure 2, described electromagnetic field emissions circuit (10) is buried and is put in the ground.The two ends of wire are connected on respectively the two ends of copped wave power oscillating circuit (3), in figure, direction shown in arrow is the flow direction of a certain moment electric current in conductor, such connected mode can make the magnetic direction between adjacent two conductors identical, intensity superposes and strengthens, and the design has utilized the magnetic field superposeing between wire to carry out energy transmission.The length of transmitting wire can be adjusted according to construction requirement, but that connection principle still needs is consistent with the design, and this routine selected distance is 10km.
As shown in Figure 3, described electromagnetic field emissions circuit (10) be embedded in train under, in this example, electromagnetic field emissions circuit is selected the Ritz copper cash of radius 10mm, two wires are embedded in the both sides of rail center by symmetry, because selecting the wheel-base bogie of vehicle in the design, be 2500mm, design two wires be arranged in distance center axis left with 900mm place to the right, and two wires are in same level, with underground railway track place plane parallel, pitch is 15mm overhead, the degree of depth of its conductor arrangement and the material of selected conductor and model can be adjusted according to actual needs, this arrangement maturation, reliably, be subject to ectocine less, need hardly to safeguard, only need in existing subway power supply structure, transform and can realize, the more other forms of transmitting circuit of cost is low.The surrounding of transmitting coil is provided with the shield as electromagnetic shielding, if shield is not installed, the magnetic field of transmitting coil transmitting will partial action on rail, cause producing in rail eddy current, make on the one hand the power consumption of system increase, Efficiency Decreasing, eddy current in rail will produce heat on the other hand, security of operation and rail life-span are impacted, in this example, use the ferrite that the trade mark is PC95 to make shield, be placed in bottom surface and the lateral surface of transmitting circuit (10), upper surface does not have shield, upper surface is used ABS engineering plastic flitch to cover, this plastic plate is detachable, in practice of construction, shield material therefor and overall dimensions can be adjusted, but structure need be consistent with this design, to guarantee shield effectiveness.
As shown in Figure 4, described electromagnetic field receiving coil (6) is formed by metallic conductor coiling, the copper cash of this routine actionradius 4mm starts from center to enclose to being counterclockwise coiling 45, overall diameter is 1550mm, interior diameter is 10mm, radial pitch is 17mm, and material and the radius of shape, size, the number of turn and the conductor of institute's coiling receiving coil all can be adjusted according to concrete condition.
As shown in Figure 5, at the bottom of the described car with electromagnetic shielding as shown in the figure, electromagnetic field receiving coil (6) is laid on locomotive bottom, because this wireless power supply system belongs to loosely coupled system, for guaranteeing sufficient energy supply, the utility model requires each joint car bottom that an electromagnetic field receiving coil (6) is at least installed, and in this example, each joint car bottom all has a receiving coil, and accesses rectifying and wave-filtering copped wave module (7) after the series connection of the coil of full car.Car bottom coil periphery part has been installed the electro-magnetic screen layer (11) that the trade mark is PC95, because train and rail are used metal material more, metal can produce eddy current under the effect of alternating electromagnetic field, the loss of increase system, the efficiency of reduction locomotive, and eddy current can cause the heating of metal, so that in service may dangerous property, in this example, select Ferrite Material not only to insulate but also there is high magnetic conductivity, can by extra magnetically confined therein, reduce the generation of eddy current loss.The thickness of the ferrite screen of selecting in this example is 3mm, is fitted in closely the surface at the bottom of car, will at the bottom of car, all cover, and coil is placed in ferritic outside, and selected shielding material and thickness can be made adjustment according to construction requirement.
Claims (5)
1. for the electromagnetic resonance formula wireless power supply system of subway, it is characterized in that being provided with electromagnetic field emissions circuit (5), the alternating electromagnetic field producing for launching copped wave power oscillating circuit; Electro-magnetic screen layer (11), by unnecessary magnetically confined therein, reduces the generation of eddy current loss.
2. the electromagnetic resonance formula wireless power supply system for subway according to claim 1, be further characterized in that, described electromagnetic field emissions circuit (5) is embedded in the both sides of rail center, and transmitting circuit is in same level, with underground railway track place plane parallel.
3. the electromagnetic resonance formula wireless power supply system for subway according to claim 1, is further characterized in that, the current opposite in direction in adjacent two wires of electromagnetic field emissions circuit (5), and the electromagnetic field direction between wire is identical.
4. the electromagnetic resonance formula wireless power supply system for subway according to claim 1, be further characterized in that, bottom surface and the left and right lateral surface of described electromagnetic field emissions circuit (5) are provided with electro-magnetic screen layer (11), and upper surface is coated with detachable insulating material.
5. the electromagnetic resonance formula wireless power supply system for subway according to claim 1, be further characterized in that, described electro-magnetic screen layer (11), in locomotive bottom, all cover electro-magnetic screen layer (11), electromagnetic field emissions circuit (5) is arranged on the bottom surface of screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320723728.8U CN203562847U (en) | 2013-11-12 | 2013-11-12 | Electromagnetic resonant type wireless power supply system used for subway |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320723728.8U CN203562847U (en) | 2013-11-12 | 2013-11-12 | Electromagnetic resonant type wireless power supply system used for subway |
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| CN203562847U true CN203562847U (en) | 2014-04-23 |
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| CN201320723728.8U Expired - Fee Related CN203562847U (en) | 2013-11-12 | 2013-11-12 | Electromagnetic resonant type wireless power supply system used for subway |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633747A (en) * | 2013-11-12 | 2014-03-12 | 天津工业大学 | Electromagnetic resonance wireless power supply system for subway |
| CN106515461A (en) * | 2016-12-29 | 2017-03-22 | 中铁二院工程集团有限责任公司 | Collector shoe of magnetic suspension train and electromagnetic shielding method of magnetic suspension train |
-
2013
- 2013-11-12 CN CN201320723728.8U patent/CN203562847U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633747A (en) * | 2013-11-12 | 2014-03-12 | 天津工业大学 | Electromagnetic resonance wireless power supply system for subway |
| CN103633747B (en) * | 2013-11-12 | 2017-02-15 | 天津工业大学 | Electromagnetic resonance wireless power supply system for subway |
| CN106515461A (en) * | 2016-12-29 | 2017-03-22 | 中铁二院工程集团有限责任公司 | Collector shoe of magnetic suspension train and electromagnetic shielding method of magnetic suspension train |
| CN106515461B (en) * | 2016-12-29 | 2023-09-22 | 中铁二院工程集团有限责任公司 | Magnetic levitation train collector shoe and magnetic levitation train electromagnetic shielding method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140423 Termination date: 20141112 |
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| EXPY | Termination of patent right or utility model |