CN110109223B - Laser wireless energy transmission system based on light guide plate - Google Patents
Laser wireless energy transmission system based on light guide plate Download PDFInfo
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- CN110109223B CN110109223B CN201910399053.8A CN201910399053A CN110109223B CN 110109223 B CN110109223 B CN 110109223B CN 201910399053 A CN201910399053 A CN 201910399053A CN 110109223 B CN110109223 B CN 110109223B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 53
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 claims description 7
- 229910001218 Gallium arsenide Inorganic materials 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000005350 fused silica glass Substances 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 7
- KXNLCSXBJCPWGL-UHFFFAOYSA-N [Ga].[As].[In] Chemical compound [Ga].[As].[In] KXNLCSXBJCPWGL-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 229910052751 metal Inorganic materials 0.000 description 2
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- 238000000149 argon plasma sintering Methods 0.000 description 1
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- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
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- 238000002834 transmittance Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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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
- H02J50/30—Circuit arrangements or systems for wireless supply or distribution of electric power using light, e.g. lasers
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a laser wireless energy transmission system based on a light guide plate, which comprises a laser emitter, the light guide plate and a photovoltaic receiver, wherein the light guide plate is used for guiding laser emitted by the laser emitter to the photovoltaic receiver, and a microstructure array used for converting non-uniform incident laser into uniform external laser is arranged on the bottom surface of the light guide plate. According to the invention, the scattering direction of laser is guided by the light guide plate, the light propagation direction is changed, the uniformity of irradiated laser on the photovoltaic receivers is improved, the mismatch loss of the series-parallel connection photovoltaic receivers caused by receiving laser with different power is reduced, and the output power and efficiency of the laser wireless energy transmission system based on the light guide plate are improved. Meanwhile, the laser is converted into a surface light source by punctiform laser in the transmission process of the light guide plate, so that the traditional flat-plate type photovoltaic receiver is convenient to receive laser irradiation, the whole receiving panel is easy to be filled with the laser, a beam shaping device is further saved, the energy loss of the device is reduced, and the cost of a system is saved.
Description
Technical Field
The invention relates to the field of wireless energy transmission, in particular to a laser wireless energy transmission system based on a light guide plate.
Background
The wireless energy transmission is a non-contact energy transmission mode, the energy transmission from the energy source to the load is not needed to be realized through a traditional transmission line, and since the technology is born, the technology is convenient and safe, and can meet the power supply requirement in certain special environments so as to be concerned by all parties, thereby having wide application prospect and extremely high practical value.
Wireless energy transmission technologies typically achieve transmission of electrical energy through air or other medium, with microwaves and lasers being two types of carriers that are considered to be relatively promising for application. The laser has the advantages of monochromaticity, good directivity, concentrated energy and the like, and even under the condition of smaller emission power, the laser wireless energy transmission system based on the light guide plate can realize remote electric energy transmission, and meanwhile, the volume and the quality of the emission and receiving equipment required by the system only need 1/10 of that of the same type of microwave equipment, thereby having more development prospect.
However, the laser is a light intensity distribution, i.e. a so-called gaussian distribution, which shows a strong light intensity in the central portion and a weak light intensity in the edge portion, and for long-distance wireless energy transmission, such non-uniformity of the laser energy is very beneficial for energy propagation in air or medium, and can reduce energy loss during transmission. However, when the receiving end performs photoelectric conversion, the efficiency of the photovoltaic receiver under non-uniform light irradiation is much lower than that of uniform light irradiation, so that a laser wireless energy system can be applied very well in a large number, and the problem of laser uniformity of the receiving end is critical.
Accordingly, the prior art is still in need of improvement.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a laser wireless energy transmission system based on a light guide plate, which aims to solve the problem that the output power and efficiency of the laser wireless energy transmission system based on the light guide plate are low due to the non-uniformity of laser radiation.
The technical scheme of the invention is as follows:
The utility model provides a wireless energy transmission system of laser based on light guide plate, wherein, includes laser emitter, light guide plate and photovoltaic receiver, the light guide plate is used for guiding the laser that laser emitter sent to photovoltaic receiver, the bottom surface of light guide plate is provided with the micro-structure array that is used for changing inhomogeneous incident laser into even outward-shot laser.
The laser wireless energy transmission system based on the light guide plate is characterized in that the microstructure array is composed of light guide points which are arranged in an array mode.
The laser wireless energy transmission system based on the light guide plate is characterized in that the microstructure array is composed of light guide points with the same size and the same density.
The laser wireless energy transmission system based on the light guide plate is characterized in that the microstructure array is composed of light guide points with different sizes and different density degrees.
The laser wireless energy transmission system based on the light guide plate is characterized in that the light guide point is one of a spherical protrusion, a cylindrical protrusion, a regular polygonal protrusion or an irregular polygonal protrusion.
The laser wireless energy transmission system based on the light guide plate is characterized in that the light guide plate is a rectangular plate and comprises four side faces, a bottom face and a top face, wherein one side face is a laser incidence face, the top face is a laser emitting face, and the other three side faces and the bottom face are both provided with reflecting plates.
The laser wireless energy transmission system based on the light guide plate is characterized in that the light guide plate is made of fused quartz.
The laser wireless energy transmission system based on the light guide plate is characterized in that the front end of the laser transmitter is also provided with a beam expander for adjusting the size of a laser spot; the laser transmitter, the beam expander and the light guide plate are positioned on the same horizontal plane, and the photovoltaic receiver is positioned right above the light guide plate.
The laser wireless energy transmission system based on the light guide plate, wherein when the laser transmitter is a 808nm wavelength semiconductor laser, the photovoltaic receiver consists of a GaAs photovoltaic cell unit.
The laser wireless energy transmission system based on the light guide plate, wherein when the laser transmitter is a diode pumped solid laser with the wavelength of more than 1000nm, the photovoltaic receiver consists of an InGaAs photovoltaic cell unit.
The beneficial effects are that: the laser wireless energy transmission system based on the light guide plate adopts the light guide plate as a key technology for solving the problem of light uniformity of a receiving end, the scattering direction of laser is guided by the light guide plate, the light propagation direction is changed, the uniformity of irradiated laser on a photovoltaic receiver is improved, the mismatch loss of the serial-parallel photovoltaic receivers caused by receiving laser with different power is reduced, and the output power and the efficiency of the laser wireless energy transmission system based on the light guide plate are improved. Meanwhile, the laser is converted into a surface light source by punctiform laser in the transmission process of the light guide plate, so that the traditional flat-plate type photovoltaic receiver is convenient to receive laser irradiation, the whole receiving panel is easy to be filled with the laser, a beam shaping device is further saved, the energy loss of the device is reduced, and the cost of a system is saved.
Drawings
Fig. 1 is a schematic structural diagram of a laser wireless energy transmission system based on a light guide plate according to a preferred embodiment of the present invention.
Detailed Description
The invention provides a laser wireless energy transmission system based on a light guide plate, which is further described in detail below in order to make the purposes, technical schemes and effects of the invention clearer and more definite. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides a laser wireless energy transmission system based on a light guide plate, as shown in fig. 1, the laser wireless energy transmission system based on the light guide plate comprises a laser emitter 10, a light guide plate 20 and a photovoltaic receiver 30, wherein the light guide plate 20 is used for guiding laser emitted by the laser emitter to the photovoltaic receiver, and a microstructure array 21 for converting non-uniform incident laser into uniform external laser is arranged on the bottom surface of the light guide plate 20.
In this embodiment, the micro-structure array disposed on the bottom surface of the light guide plate can convert the laser incident into the light guide plate from a total reflection state to a diffuse reflection state, that is, the micro-structure array can change the propagation direction of the laser, and the laser can achieve the purpose of uniform emergent after being reflected, refracted and scattered, so as to improve the uniformity of the irradiated laser on the photovoltaic receiver, reduce the mismatch loss of the serial-parallel photovoltaic receivers caused by receiving the laser with different powers, and improve the output power and efficiency of the laser wireless energy transmission system based on the light guide plate. Meanwhile, the laser is converted into a surface light source by punctiform laser in the transmission process of the light guide plate, so that the traditional flat-plate type photovoltaic receiver is convenient to receive laser irradiation, the whole receiving panel is easy to be filled with the laser, a beam shaping device is further saved, the energy loss of the device is reduced, and the cost of a system is saved.
In some embodiments, the light guide plate is made of an optical transparent material, the microstructure array is formed by light guide points arranged in an array, and the light guide points are made on the bottom surface of the light guide plate by adopting methods such as chemical etching, precise mechanical engraving, mold injection molding and the like. According to the embodiment, the light guide point is manufactured on the bottom surface of the light guide plate, when laser irradiates the light guide point, one light ray is scattered into a plurality of light rays by utilizing the light scattering principle, one part of the scattered light rays can be emitted out of the light guide plate, the other part of the scattered light rays can be continuously reflected until the next light guide point is encountered, and the scattering process is repeated; therefore, the uniformity (more than 90%) of laser emitted from the light guide plate can be effectively improved by arranging the light guide points arranged in an array on the bottom surface of the light guide plate, and the problems that output current of a photovoltaic receiver is limited by minimum photo-generated current and output voltage of the photovoltaic receiver is limited by minimum photo-generated voltage in the laser wireless energy transmission process due to the non-uniformity of the laser can be effectively solved, so that the output efficiency and the output power of a laser wireless energy transmission system based on the light guide plate can be improved. In this embodiment, the light guide plate can guide the laser to uniformly irradiate the whole photovoltaic receiver through the light guide points arranged on the bottom surface of the light guide plate, so that the distribution of the light is controlled more efficiently and the photoelectric efficiency is improved by using the laser more efficiently.
In some embodiments, since the laser has a high temperature, when a material such as PMMA is used as the light guide plate material, the light guide plate is easy to be damaged in the laser transmission process, so that the embodiment adopts high-temperature-resistant fused quartz as the light guide plate material, and the heat resistance of the embodiment is high, thereby well meeting the characteristics of laser transmission. In some embodiments, the laser incident surface and the front output surface of the light guide plate are both coated with 808nm or 1000nm antireflection film for improving the coupling efficiency and output effect of laser.
In some embodiments, the light guide plate can be manufactured in a whole, or can be manufactured independently and spliced into a whole at will, and the light guide plate has simple process and convenient manufacture. In some embodiments, the microstructure array is composed of light guide points with the same size and the same density, i.e. uniform and identical laser dot layout is adopted. In other embodiments, the microstructure array is composed of light guide points with different sizes and different densities, i.e. dot layouts with different sizes and different densities are made according to the specifications of the photovoltaic receiver. The uniformity of laser received by a photovoltaic receiver in the wireless energy transmission system can be improved through the density and the size difference of the light guide points, namely, the whole laser emitted from the light guide plate is very uniform, and the light uniformity can reach more than 90 percent, so that the photoelectric efficiency of the laser wireless energy transmission system based on the light guide plate with the light guide plate used in a large area can be effectively improved. In the light guide plate, the material, the size, the arrangement rule and the processing mode of the light guide points determine the illuminance and the uniformity of the surface of the output laser of the light guide plate, the light guide points are reasonably arranged, and the total reflection condition of the laser is destroyed, so that the purpose of uniform emergent of the laser after reflection, refraction and scattering can be achieved.
In some embodiments, as shown in fig. 1, the light guide plate is a rectangular plate, which includes four sides, a bottom surface and a top surface, wherein one side is a laser incident surface, the top surface is a laser emitting surface, and the other three sides and the bottom surface are each provided with a reflective plate 22. In this embodiment, the reflection plate may reflect the laser light that is not scattered into the light conduction region, so as to improve the light utilization rate, reduce the power loss of the laser light in the light guide plate, and improve the laser light transmission rate in the light guide plate. The reflecting plate can adopt a metal reflecting plate, the reflecting mode is specular reflection, the metal reflecting surface has high reflectivity, the heat conduction generated in the transmission process of laser in the light guide plate is facilitated, the influence of temperature on equipment and devices is reduced, and the service life of the equipment is prolonged. After the laser is coupled into the light guide plate from the laser incidence surface of the light incidence surface, the laser can be reflected back and forth on the bottom surface and the side surface of the light guide plate due to the existence of the reflecting plate and then emitted from the top surface of the light guide plate; when laser meets the light guide point arranged on the bottom surface of the light guide plate, the laser can scatter to all directions after irradiating the light guide point due to the fact that the total reflection condition of the laser is destroyed, so that diffuse reflection is formed, and due to the fact that the three side surfaces and the bottom surface of the light guide plate are provided with reflecting plates, the laser is transmitted out from the top surface of the light guide plate after being refracted and reflected for many times to form a uniform surface light source with front output, so that a round incident light spot is shaped into a square light spot, the uniform laser with the shape just meets the appearance requirement of a flat-plate type photovoltaic receiver, and the laser can be well matched with the photovoltaic receiver.
In some embodiments, the light guide point is one of a spherical protrusion, a cylindrical protrusion, a regular polygonal protrusion, or an irregular polygonal protrusion, but is not limited thereto.
In some embodiments, as shown in fig. 1, the laser wireless energy transmission system based on a light guide plate further includes a beam expander 40 disposed at the front end of the laser transmitter, where the laser transmitter 10, the beam expander 40 and the light guide plate 20 are sequentially located on the same horizontal plane, and the photovoltaic receiver 30 is located directly above the light guide plate. In this embodiment, the beam expander is a galilean multiple beam expander, and the beam expander is composed of two lenses, including an input concave lens and an output convex lens, the input lens transmits the virtual focus beam to the output lens, and two sides of the two lenses are coated with 808nm or 1000nm narrow-band antireflection films, so as to increase the light transmittance of laser. The beam expander has the functions of collimating laser emitted by the laser emitter, reducing the divergence angle of the laser beam, adjusting the spot size of the laser and ensuring that the transmitted laser can completely enter the light guide plate. Laser emitted by the laser transmitter is collimated by the beam expander and then is transmitted to the light guide plate in an air or other non-connected long distance mode, the shape of a laser spot entering the light guide plate is circular, and the diameter of the circular laser spot is smaller than the thickness of the side face of the light guide plate.
In some embodiments, the photovoltaic receiver is formed by connecting a plurality of photovoltaic battery units in series and parallel, and has the characteristics of simple structure, small volume, convenient use and the like. The photovoltaic cell can be made of monocrystalline silicon, polycrystalline silicon, gaAs, indium gallium arsenide (InGaAs) and other materials, and has the band gap width which is exactly matched with 808nm wavelength or 1000nm laser, and has high photoelectric conversion efficiency. When laser irradiates on the pn junction, electron-hole pairs are generated, carriers generated by junction accessories in the semiconductor are not recombined and reach a space charge region, the carriers are attracted by a built-in electric field, electrons flow into an n region, holes flow into a P region, the n region stores excessive electrons, the P region does not have excessive holes, a photo-generated electric field opposite to a potential barrier direction is formed near the pn junction, and photo-generated voltage is generated, and the photovoltaic receiver has the advantages of simple structure, stable performance, durability, high utilization rate and the like
The photovoltaic receiver is also provided with a charging control circuit, and the control circuit has the functions of keeping the output voltage stable, reducing the output voltage of the photovoltaic cell unit with higher irradiation light intensity and increasing the output voltage of the photovoltaic cell unit with insufficient irradiation light intensity, so that the output voltage difference between the photovoltaic cell unit and the charging control circuit is reduced, and the output efficiency of the photovoltaic receiver is improved.
In some embodiments, when the laser transmitter is a 808nm wavelength semiconductor laser, the photovoltaic receiver is comprised of GaAs photovoltaic cells. The wavelength of 808nm of the semiconductor laser is exactly matched with the band gap width of the photovoltaic cell of the GaAs material, and the photoelectric conversion efficiency can reach 50 percent, so that the photovoltaic receiver is preferably a GaAs photovoltaic cell for a wireless energy transmission system adopting the laser with 808nm wavelength.
In some embodiments, when the laser transmitter is a diode pumped solid state laser with a wavelength greater than 1000nm, the photovoltaic receiver is comprised of InGaAs photovoltaic cells. The diode pumped solid laser has the characteristics of small volume, long service life, reliable operation and the like, has higher output power (such as 100 kw), can keep the advantages of higher emissivity and the like under high power, and is suitable for laser wireless energy transmission. It is noted that the laser wavelength generated by the diode pumped solid state laser is greater than 1000nm, and the photoelectric conversion efficiency of the solar panel using Si and GaAs materials is low in this wavelength band, so that an indium gallium arsenide (InGaAs) photovoltaic cell with high conversion efficiency at the laser wavelength of 1000nm (the photoelectric conversion efficiency at 1000nm is 50%) needs to be selected.
In summary, the laser wireless energy transmission system based on the light guide plate provided by the invention adopts the light guide plate as a key technology for solving the problem of light uniformity of the receiving end, the scattering direction of laser is guided by the light guide plate, the light propagation direction is changed, the uniformity of irradiated laser on the photovoltaic receiver is improved, the mismatch loss of the serial-parallel photovoltaic receivers caused by receiving laser with different power is reduced, and the output power and the efficiency of the laser wireless energy transmission system based on the light guide plate are improved. Meanwhile, the laser is converted into a surface light source by punctiform laser in the transmission process of the light guide plate, so that the traditional flat-plate type photovoltaic receiver is convenient to receive laser irradiation, the whole receiving panel is easy to be filled with the laser, a beam shaping device is further saved, the energy loss of the device is reduced, and the cost of a system is saved.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (1)
1. The laser wireless energy transmission system based on the light guide plate is characterized by comprising a laser emitter, the light guide plate and a photovoltaic receiver, wherein the light guide plate is used for guiding laser emitted by the laser emitter to the photovoltaic receiver, and a microstructure array used for converting non-uniform incident laser into uniform external laser is arranged on the bottom surface of the light guide plate; the microstructure array is formed by light guide points arranged in an array manner; the microstructure array is composed of light guide points with the same size and the same density degree, or is composed of light guide points with different sizes and different densities degree; the light guide point is one of a spherical bulge, a columnar bulge, a regular polygonal bulge or an irregular polygonal bulge;
The light guide plate is a rectangular plate and comprises four side faces, a bottom face and a top face, wherein one side face is a laser incidence face, the top face is a laser emitting face, and the other three side faces and the bottom face are both provided with reflecting plates; the light guide plate is made of fused quartz; the laser incidence surface and the laser emission surface are plated with 808nm or 1000nm antireflection films;
the front end of the laser transmitter is also provided with a beam expander for adjusting the size of the laser spot; the laser transmitter, the beam expander and the light guide plate are positioned on the same horizontal plane, and the photovoltaic receiver is positioned right above the light guide plate;
the photovoltaic receiver is formed by connecting a plurality of photovoltaic cell units in series and parallel, wherein when the laser transmitter is a 808nm wavelength semiconductor laser, the photovoltaic receiver is formed by GaAs photovoltaic cell units; when the laser transmitter is a diode pumped solid state laser with a wavelength greater than 1000nm, the photovoltaic receiver is comprised of InGaAs photovoltaic cells.
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| CN201910399053.8A CN110109223B (en) | 2019-05-14 | 2019-05-14 | Laser wireless energy transmission system based on light guide plate |
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| CN110109223B true CN110109223B (en) | 2024-04-26 |
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