CN209879068U - 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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- CN209879068U CN209879068U CN201920685236.1U CN201920685236U CN209879068U CN 209879068 U CN209879068 U CN 209879068U CN 201920685236 U CN201920685236 U CN 201920685236U CN 209879068 U CN209879068 U CN 209879068U
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- guide plate
- wireless energy
- transmission system
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Abstract
The utility model discloses a laser wireless energy transmission system based on light guide plate, it includes laser emitter, light guide plate and photovoltaic receiver, the light guide plate is used for the laser direction to the photovoltaic receiver that sends laser emitter, the bottom surface of light guide plate is provided with and is used for changing inhomogeneous incident laser into the even micro-structure array that penetrates laser outward. The utility model discloses a scattering direction of light guide plate guide laser changes the propagation direction of light, improves the homogeneity of the irradiation laser on the photovoltaic receiver, reduces the mismatch loss that the photovoltaic receiver of series-parallel connection caused owing to receiving the different laser of power, improves the output and the efficiency based on the wireless energy transmission system of laser of light guide plate. Meanwhile, the laser is converted into the surface light source by the punctiform laser in the transmission process of the light guide plate, so that the traditional flat plate type photovoltaic receiver can receive laser irradiation conveniently, the whole receiving panel is filled with the laser easily, and the energy loss of devices is reduced.
Description
Technical Field
The utility model relates to a wireless energy transmission field especially relates to a laser wireless energy transmission system based on light guide plate.
Background
Since the technology comes out, the wireless energy transmission is very convenient and safe, can meet the power supply requirement in some special environments, is concerned by all parties, and has wide application prospect and high practical value.
Wireless energy transmission techniques typically achieve the transmission of electrical energy through air or other media, with two carriers considered to be relatively promising, microwaves and lasers. The laser has the advantages of monochromaticity, good directivity, energy concentration and the like, the laser wireless energy transmission system based on the light guide plate can also realize remote electric energy transmission even under the condition of smaller transmitting power, and meanwhile, the volume and the mass of transmitting and receiving equipment required by the system only need 1/10 of the same type of microwave equipment, so the system has more development prospect.
However, the laser has a light intensity distribution with a strong light intensity in the central part and a weak light intensity in the edge part, i.e. a so-called gaussian distribution, and for long-distance wireless energy transmission, the non-uniformity of the laser energy is very favorable for energy to propagate in air or media, so that the energy loss in the transmission process can be reduced. 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 well applied in a large amount, and the key point is to solve the problem of uniform laser of the receiving end.
Therefore, the prior art is still to be improved.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned prior art not enough, the utility model aims at providing a wireless energy transmission system of laser based on light guide plate aims at solving because the inhomogeneous and lead to the output power and the lower problem of efficiency of the wireless energy transmission system of laser based on light guide plate of laser radiation.
The technical scheme of the utility model as follows:
the laser wireless energy transmission system based on the light guide plate 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 outgoing laser is arranged on the bottom surface of the light guide plate.
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.
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 degree.
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 points are one of spherical bulges, cylindrical bulges, regular polygonal bulges or irregular polygonal bulges.
The laser wireless energy transmission system based on the light guide plate, wherein, the light guide plate is the rectangular plate, and it includes four sides, bottom surface and top surface, and one of them side is laser incident face, the top surface is the laser outgoing face, other three sides and bottom surface all are provided with the reflecting plate.
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 located on the same horizontal plane, and the photovoltaic receiver is located right above the light guide plate.
The laser wireless energy transmission system based on the light guide plate is characterized in that when the laser transmitter is a 808nm wavelength semiconductor laser, the photovoltaic receiver is composed of GaAs photovoltaic cell units.
The laser wireless energy transmission system based on the light guide plate is characterized in that when the laser transmitter is a diode-pumped solid-state laser with the wavelength larger than 1000nm, the photovoltaic receiver is composed of InGaAs photovoltaic cell units.
Has the advantages that: the utility model provides a laser wireless energy transmission system based on light guide plate adopts the light guide plate as the key technology who solves the even problem of receiving terminal light, through the scattering direction of light guide plate guide laser, changes the propagation direction of light, improves the homogeneity of the irradiation laser on the photovoltaic receiver, reduces the mismatch loss that the photovoltaic receiver of series-parallel connection caused owing to receiving the different laser of power, improves the output and the efficiency of the laser wireless energy transmission system based on the light guide plate. Meanwhile, the laser is converted into the surface light source by the point laser in the transmission process of the light guide plate, so that the traditional flat plate type photovoltaic receiver can receive laser irradiation conveniently, the whole receiving panel is easily filled with the laser, light beam shaping devices are further saved, the energy loss of the devices is reduced, and the cost of the system is saved.
Drawings
Fig. 1 is a schematic structural view of a preferred embodiment of a laser wireless energy transmission system based on a light guide plate according to the present invention.
Detailed Description
The utility model provides a laser wireless energy transmission system based on light guide plate, for making the utility model discloses a purpose, technical scheme and effect are clearer, more clear and definite, it is following right the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the utility model provides a laser wireless energy transmission system based on light guide plate, as shown in FIG. 1, laser wireless energy transmission system based on light guide plate includes laser emitter 10, light guide plate 20 and photovoltaic receiver 30, light guide plate 20 is used for leading the laser that laser emitter sent to photovoltaic receiver, light guide plate 20's bottom surface is provided with and is used for turning inhomogeneous incident laser into the even micro-structure array 21 that jets laser outward.
In this embodiment, the microstructure array disposed on the bottom surface of the light guide plate can convert laser light entering the light guide plate from a total reflection state to a diffuse reflection state, that is, the microstructure array can change the propagation direction of the laser light, and the laser light can be uniformly emitted after being reflected, refracted, and scattered, so that the uniformity of the irradiated laser light on the photovoltaic receiver is improved, mismatch loss caused by the fact that the photovoltaic receivers connected in series and parallel receive laser light with different powers 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 the surface light source by the point laser in the transmission process of the light guide plate, so that the traditional flat plate type photovoltaic receiver can receive laser irradiation conveniently, the whole receiving panel is easily filled with the laser, light beam shaping devices are further saved, the energy loss of the devices is reduced, and the cost of the system is saved.
In some embodiments, the light guide plate is made of an optical grade transparent material, the microstructure array is composed of light guide points arranged in an array, and the light guide points are made on the bottom surface of the light guide plate by using methods such as chemical etching, precision mechanical engraving, mold injection molding and the like. In the embodiment, the light guide points are manufactured on the bottom surface of the light guide plate, and by using the light scattering principle, when laser irradiates the light guide points, one light ray is scattered into a plurality of light rays, one part of the scattered light rays can be emitted out of the light guide plate, and the other part of the scattered light rays can be continuously reflected until the next light guide point is met, and the scattering process is repeated; therefore, the uniformity (more than 90%) of the laser emitted from the light guide plate can be effectively improved by arranging the light guide points in an array manner on the bottom surface of the light guide plate, and the problems that the output current of the photovoltaic receiver is limited by the minimum light-generated current and the output voltage of the photovoltaic receiver is limited by the minimum light-generated voltage in the laser wireless energy transmission process can be effectively solved, so that the output efficiency and the output power of the 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 as to more efficiently control the distribution of the light and more efficiently utilize the laser to improve the photoelectric efficiency.
In some embodiments, since the laser has a high temperature, when PMMA or the like is used as the material of the light guide plate, the light guide plate is easily damaged in the laser transmission process, so the embodiment uses high temperature-resistant fused quartz as the material of the light guide plate, which has a high heat resistance, and well meets the characteristics of laser transmission. In some embodiments, the laser light incident surface and the front output surface of the light guide plate are coated with 808nm or 1000nm antireflection films for improving the coupling efficiency and output effect of the laser light.
In some embodiments, the light guide plate can be manufactured in a whole block, or can be manufactured separately and spliced into a whole at will, and the light guide plate is simple in process and convenient to manufacture. In some embodiments, the microstructure array is composed of light guide points with the same size and the same density, that is, a uniform and same laser dot layout is adopted. In other embodiments, the microstructure array is composed of light guide points with different sizes and different density degrees, that is, mesh point layouts with different sizes and different density degrees are made according to the specification of the photovoltaic receiver. Through the difference of the density of design leaded light point, size can improve the homogeneity of the laser that photovoltaic receiver received in the wireless energy transmission system, the whole very even of laser that jets out from the light guide plate promptly, and light homogeneity can reach more than 90%, and this can effectively promote its photoelectric efficiency to the laser wireless energy transmission system based on the light guide plate that uses the light guide plate by a large scale. In the light guide plate, the material, the size, the arrangement rule and the processing mode of the light guide points determine the illumination and the uniformity of the output laser surface 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 aim of uniformly emitting the laser after reflection, refraction and scattering can be fulfilled.
In some embodiments, as shown in fig. 1, the light guide plate is a rectangular plate including four side surfaces, a bottom surface and a top surface, wherein one side surface is a laser incident surface, the top surface is a laser emitting surface, and the other three side surfaces and the bottom surface are provided with the reflective plates 22. In this embodiment, the reflective plate may reflect unscattered laser light to enter the light conducting region, so as to improve the utilization rate of light, reduce the power loss of laser light in the light guide plate, and improve the transmission rate of laser light in the light guide plate. The reflecting plate can adopt a metal reflecting sheet, the reflecting mode is mirror reflection, the reflectivity of the metal reflecting surface is high, 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 laser is coupled into the light guide plate from the laser entrance surface of the light guide plate, 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 is emitted from the top surface of the light guide plate; when the laser meets the light guide points arranged on the bottom surface of the light guide plate, the total reflection condition of the laser is destroyed, the laser can be scattered to all directions after irradiating the light guide points, so that diffuse reflection is formed, the three side surfaces and the bottom surface of the light guide plate are provided with the reflecting plates, the laser is transmitted out from the top surface of the light guide plate after being refracted and reflected for multiple times to form an even surface light source with front output, so that a round incident light spot is formed into a square light spot, the even laser in the shape just meets the shape requirement of a flat-plate photovoltaic receiver, and the even laser can be well matched with the photovoltaic receiver for use.
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 system for transmitting laser wireless energy based on a light guide plate further includes a beam expander 40 disposed at a front end of the laser transmitter, the laser transmitter 10, the beam expander 40 and the light guide plate 20 are sequentially located at 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 type multi-power 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 light beam to the output lens, and two surfaces of the two lenses are coated with 808nm or 1000nm narrow-band antireflection films to increase the light transmittance of the laser. The beam expander is used for collimating the laser emitted by the laser emitter, reducing the divergence angle of the laser beam, adjusting the size of a laser spot and ensuring that the transmitted laser can completely enter the light guide plate. Laser emitted by the laser emitter is collimated by the beam expander and then is transmitted to the light guide plate through air or other non-contact long distances, 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 composed of a plurality of photovoltaic cells connected in series and parallel, and has the characteristics of simple structure, small volume, convenience in use and the like. The photovoltaic cell can be made of materials such as monocrystalline silicon, polycrystalline silicon, GaAs, indium gallium arsenide (InGaAs) and the like, the band gap width of the photovoltaic cell is just matched with laser with wavelength of 808nm or 1000nm, and the photovoltaic cell has high photoelectric conversion efficiency. When laser irradiates the pn junction, electron-hole pairs are generated, carriers generated near the internal junction of the semiconductor are not recombined and reach the space charge region, the electrons flow into the n region and the holes flow into the P region under the attraction of a built-in electric field, so that the n region stores surplus electrons, the P region does not have surplus holes, and the surplus electrons and the holes form a photogenerated electric field opposite to the barrier direction near the pn junction so as to generate photogenerated voltage
The photovoltaic receiver is also provided with a charging control circuit, and the control circuit is used for 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 photovoltaic cell unit is reduced, and the output efficiency of the photovoltaic receiver is improved.
In some embodiments, when the laser emitter is a 808nm wavelength semiconductor laser, the photovoltaic receiver is comprised of GaAs photovoltaic cell units. The wavelength of the 808nm of the semiconductor laser is just matched with the band gap width of the photovoltaic cell made of the GaAs material, and the photoelectric conversion efficiency can reach 50 percent, so for a wireless energy transmission system adopting the laser with the wavelength of 808nm, the photovoltaic receiver preferably adopts the GaAs photovoltaic cell.
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-state laser not only has the characteristics of small volume, long service life, reliable operation and the like, but also has the advantages of higher output power (such as 100 kw), higher radiation rate under high power and the like, so that the diode-pumped solid-state laser is also suitable for laser wireless energy transmission. It should be noted that the laser wavelength generated by the diode-pumped solid-state laser is greater than 1000nm, and for a solar cell panel generally adopting Si and GaAs materials, the photoelectric conversion efficiency is low in this wavelength range, so that an indium-gallium-arsenide (InGaAs) photovoltaic cell with high conversion efficiency at the laser wavelength of 1000nm (photoelectric conversion efficiency at 1000nm is 50%) needs to be selected.
To sum up, the utility model provides a laser wireless energy transmission system based on light guide plate adopts the light guide plate as the key technology who solves the even problem of receiving terminal light, through the scattering direction of light guide plate guide laser, changes the propagation direction of light, improves the homogeneity of the irradiation laser on the photovoltaic receiver, reduces the mismatch loss that the photovoltaic receiver of series-parallel connection caused owing to receiving the different laser of power, improves the output and the efficiency based on the laser wireless energy transmission system of light guide plate. Meanwhile, the laser is converted into the surface light source by the point laser in the transmission process of the light guide plate, so that the traditional flat plate type photovoltaic receiver can receive laser irradiation conveniently, the whole receiving panel is easily filled with the laser, light beam shaping devices are further saved, the energy loss of the devices is reduced, and the cost of the system is saved.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. The laser wireless energy transmission system based on the light guide plate is characterized by comprising a laser transmitter, the light guide plate and a photovoltaic receiver, wherein the light guide plate is used for guiding laser emitted by the laser transmitter to the photovoltaic receiver, and a microstructure array used for converting non-uniform incident laser into uniform outgoing laser is arranged on the bottom surface of the light guide plate.
2. The light guide plate-based laser wireless energy transmission system according to claim 1, wherein the microstructure array is composed of light guide points arranged in an array.
3. The light guide plate-based laser wireless energy transmission system according to claim 2, wherein the microstructure array is composed of light guide points with the same size and the same density.
4. The light guide plate-based laser wireless energy transmission system according to claim 2, wherein the micro-structure array is composed of light guide points with different sizes and different density degrees.
5. The light guide plate-based laser wireless energy transmission system according to any one of claims 2 to 4, wherein the light guide points are one of spherical protrusions or polygonal protrusions.
6. The light guide plate-based laser wireless energy transmission system according to claim 1, wherein the light guide plate is a rectangular plate comprising four side surfaces, a bottom surface and a top surface, one of the side surfaces is a laser incident surface, the top surface is a laser emitting surface, and the other three side surfaces and the bottom surface are provided with reflecting plates.
7. The light guide plate-based laser wireless energy transmission system according to claim 1, wherein the light guide plate material is fused silica.
8. The light guide plate-based laser wireless energy transmission system according to claim 1, wherein the front end of the laser transmitter is further 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 located on the same horizontal plane, and the photovoltaic receiver is located right above the light guide plate.
9. The light guide plate-based laser wireless energy transmission system according to claim 1, wherein when the laser transmitter is a 808nm wavelength semiconductor laser, the photovoltaic receiver is composed of GaAs photovoltaic cell units.
10. The light guide plate-based laser wireless energy transmission system according to claim 1, wherein when the laser transmitter is a diode-pumped solid state laser with a wavelength greater than 1000nm, the photovoltaic receiver is composed of InGaAs photovoltaic cell units.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920685236.1U CN209879068U (en) | 2019-05-14 | 2019-05-14 | Laser wireless energy transmission system based on light guide plate |
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| CN201920685236.1U CN209879068U (en) | 2019-05-14 | 2019-05-14 | Laser wireless energy transmission system based on light guide plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110109223A (en) * | 2019-05-14 | 2019-08-09 | 深圳技术大学 | A kind of laser radio energy transmission system based on light guide plate |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110109223A (en) * | 2019-05-14 | 2019-08-09 | 深圳技术大学 | A kind of laser radio energy transmission system based on light guide plate |
| CN110109223B (en) * | 2019-05-14 | 2024-04-26 | 深圳技术大学 | Laser wireless energy transmission system based on light guide plate |
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Granted publication date: 20191231 Termination date: 20200514 |