Laser-based power receiving method and power transmission system

Abstract

Disclosed in the present invention are a laser-based power receiving method and a power transmission system. The laser-based power receiving method comprises the following steps: providing a rotatable polygon mirror, wherein the polygon mirror is configured to have a plurality of reflecting surfaces; inputting first light beams to the reflecting surfaces of the rotating polygon mirror in a first direction, and reflecting the first light beams to form a first image surface; inputting second light beams to the reflecting surfaces of the rotating polygon mirror in a second direction, and reflecting the second light beams to form a second image surface; and arranging photovoltaic arrays on the first image surface and the second image surface. In the laser-based power receiving method of the present invention, the photovoltaic arrays are arranged on the first image surface and the second image surface, the polygon mirror can continuously scan the photovoltaic arrays by reflecting the first light beams and the second light beams, and two arc-shaped photovoltaic receiving surfaces are formed on the polygon mirror, thereby significantly increasing the area of the photovoltaic receiving surfaces, and achieving the effects of increasing the power transmitted via laser and improving the overall output power.

Description

Laser energy receiving method and energy transmission system Technical Field

[0001] The present invention relates to the field of laser technology, and in particular to a laser energy receiving method and an energy transmission system. Background Art

[0002] Laser wireless energy transmission systems, as a new wireless energy transmission method, have attracted widespread attention due to their high transmission efficiency, excellent safety, and long-distance transmission capabilities. As a key component in laser wireless energy transmission, the conversion efficiency of photovoltaic receivers is directly related to the system's conversion efficiency and output power.

[0003] Currently, the most commonly used photovoltaic receiver structure is a flat-plate structure, commonly known as a photovoltaic panel. However, because photovoltaic panels use a series-parallel structure, when uneven Gaussian laser light strikes the panels, the output current, voltage, and power of each photovoltaic cell at the receiving end will be inconsistent. This causes the system's output power to be essentially equal to the photovoltaic cell with the lowest output power, resulting in significant energy loss in the circuit and affecting the energy conversion efficiency of the laser wireless energy transmission system.

[0004] Therefore, the existing technology needs to be improved and developed. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a laser energy receiving method and an energy transmission system aimed at solving the problem that the structure of the photovoltaic receiver commonly used in the laser wireless energy transmission system in the prior art is a flat-plate structure, which affects the energy conversion efficiency of the laser wireless energy transmission system.

[0006] The technical solution of the present invention is as follows: A laser energy receiving method is provided, which includes the following steps: setting a rotatable polyhedron mirror, wherein the polyhedron mirror is configured to have multiple reflecting surfaces; inputting a first light beam into the reflecting surface of the rotating polyhedron mirror along a first direction, and the first light beam is reflected to form a first image plane; inputting a second light beam into the reflecting surface of the rotating polyhedron mirror along a second direction, and the second light beam is reflected to form a second image plane, wherein the first direction and the second direction are opposite; and arranging photovoltaic arrays on the first image plane and the second image plane.

[0007] According to a further configuration of the present invention, the power of the first light beam and the second light beam are the same.

[0008] A further arrangement of the present invention is that the step of inputting the first light beam along the first direction into the reflecting surface of the rotating polyhedron mirror and reflecting to form the first image plane includes: setting a laser to emit a laser beam through the laser; collimating the laser beam emitted by the laser, and splitting the collimated laser beam to form a first light beam and a second light beam.

[0009] A further arrangement of the present invention is that the steps of collimating the laser beam emitted by the laser and splitting the collimated laser beam to form a first beam and a second beam include: providing a beam expander and a beam splitter, wherein the beam splitter is located on the output light path of the beam expander; inputting the laser beam into the beam expander for collimation; and inputting the collimated laser beam into the beam splitter for splitting to form a first beam and a second beam.

[0010] According to a further configuration of the present invention, the step of inputting the collimated laser beam into the spectroscope for splitting to form the first beam and the second beam includes: partially transmitting the collimated laser beam through the spectroscope to form the first beam; and partially reflecting the collimated laser beam through the spectroscope to form the second beam.

[0011] The present invention is further provided that the step of inputting the first light beam along the first direction into the reflecting surface of the rotating polyhedron mirror includes: setting a first reflecting component; inputting the first light beam through the first reflecting component so that after the first light beam passes through the first reflecting component, the first light beam is parallel to the first direction.

[0012] According to a further configuration of the present invention, the step of inputting the second light beam along the second direction onto the reflecting surface of the rotating polygonal mirror comprises: providing a second reflecting component;

[0013] The second light beam is inputted through the second reflective component, so that the second light beam is parallel to the second direction after passing through the second reflective component.

[0014] Based on the same invention, the present invention also provides an energy transmission system based on the above-mentioned laser energy receiving method, which comprises: a rotatable polygonal mirror, a laser, a beam splitter and a photovoltaic array, wherein the polygonal mirror has multiple reflecting surfaces;

[0015] The laser is used to emit a laser beam, and the spectrometer is arranged on the output optical path of the laser to split the laser beam into a first beam and a second beam; wherein the first beam is input to the reflecting surface of the rotating polygonal mirror along a first direction, and the first beam is reflected to form a first image plane; the second beam is input to the reflecting surface of the rotating polygonal mirror along a second direction, and the second beam is reflected to form a second image plane; the photovoltaic array is arranged on the first image plane and the second image plane.

[0016] A further configuration of the present invention further includes: a beam expander, which is arranged on the light output path of the laser and located between the laser and the beam splitter, and is used to collimate the laser beam output by the laser.

[0017] According to a further configuration of the present invention, the photovoltaic array comprises: a plurality of photovoltaic cells connected in series.

[0018] Beneficial Effects: The present invention discloses a laser energy receiving method and energy transmission system. The laser energy receiving method includes the following steps: providing a rotatable polygonal mirror, wherein the polygonal mirror is configured to have multiple reflective surfaces; inputting a first light beam along a first direction onto the reflective surface of the rotating polygonal mirror, whereby the first light beam is reflected to form a first image plane; inputting a second light beam along a second direction onto the reflective surface of the rotating polygonal mirror, whereby the second light beam is reflected to form a second image plane, wherein the first direction and the second direction are opposite; and disposing photovoltaic arrays on the first image plane and the second image plane.

[0019] In the laser energy receiving method of the present invention, photovoltaic arrays are provided on the first image plane and the second image plane. The polyhedron rotating mirror continuously scans the photovoltaic array by reflecting the first light beam and the second light beam. Two arc-shaped photovoltaic receiving surfaces are formed on the polyhedron rotating mirror, which significantly increases the area of ​​the photovoltaic receiving surface, thereby increasing the energy of the transmitted laser and thus increasing the overall output power.

[0020] Furthermore, the first and second light beams are reflected by the high-speed rotating polygonal mirror, so that the polygonal mirror can scan the photovoltaic array, so that each photovoltaic cell in the photovoltaic array can obtain the same illumination, and accordingly generate the same photocurrent and voltage. Then, there will be no circuit loss in the photovoltaic array in which each photovoltaic cell is connected in series, thereby further achieving the effect of improving the overall output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] FIG1 is a flow chart of a laser energy receiving method provided by the present invention

[0023] FIG2 is a schematic structural diagram of an energy transmission system based on the laser energy receiving method described in FIG1 , provided by the present invention.

[0024] Explanation of the accompanying drawings: 10, polygonal rotating mirror; 20, laser; 30, beam expander; 40, beam splitter; 50, first reflection component; 60, second reflection component; 51, first reflection mirror; 52, second reflection mirror; 53, third reflection mirror; 61, fourth reflection mirror; 62, fifth reflection mirror; aa, first image plane; bb, second image plane. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0027] Laser wireless energy transmission systems are an emerging wireless energy transmission method, widely acclaimed for their high transmission efficiency, excellent safety, and long-distance transmission capabilities. As a key component in laser wireless energy transmission, the conversion efficiency of the photovoltaic receiver directly affects the conversion efficiency and output power of the entire system.

[0028] Currently, existing photovoltaic receivers typically employ a flat-plate structure, commonly known as a photovoltaic panel. However, because photovoltaic panels are connected in series and parallel, when unevenly distributed Gaussian laser light strikes the panels, the output current, voltage, and power of each photovoltaic cell at the receiving end vary. This discrepancy causes the system's output power to essentially equal that of the photovoltaic cell with the lowest output power, leading to significant energy loss in the circuit and significantly reducing the energy conversion efficiency of the laser wireless energy transmission system.

[0029] To improve conversion efficiency, some literature has proposed using customized photovoltaic cells of different sizes to form a flat photovoltaic cell based on the intensity distribution of the laser. Others have proposed using a zigzag photovoltaic receiver panel to reduce the reflection loss of the laser through the zigzag structure. Although these methods can improve system conversion efficiency, they have problems such as complex structure, high cost, and manufacturing difficulties.

[0030] Therefore, the existing technology still needs to be improved and developed.

[0031] Therefore, based on the above technical problems, the present invention provides a laser energy receiving method and an energy transmission system, which will be described below with reference to FIG1 and FIG2 and specific embodiments.

[0032] As shown in FIG1 , the present invention provides a laser energy receiving method. FIG1 is a flow chart of the laser energy receiving method. The order of the steps in the flow chart may be changed, and some steps may be omitted, depending on different requirements. The laser energy receiving method is described in detail below. The steps of the laser energy receiving method specifically include the following: S100. A rotatable polyhedron mirror is provided, wherein the polyhedron mirror is configured to have multiple reflective surfaces.

[0033] Specifically, as shown in Figures 1 and 2, the present invention provides a rotatable polyhedron mirror 10 in scenarios requiring energy transmission. The polyhedron mirror 10 is specifically an ultra-high-speed polyhedron mirror 10 capable of high-speed rotation, with rotation speeds reaching picoseconds or even femtoseconds. In an embodiment of the present invention, the polyhedron mirror 10 is a trihedron structure having three reflective surfaces. The three reflective surfaces form an equilateral triangle cross-section, and the polyhedron mirror 10 rotates around the center of the inscribed circle of the equilateral triangle.

[0034] Of course, the number, shape, rotation speed, and reflective coating of the polyhedron rotating mirror 10 can be changed accordingly according to actual conditions. For example, the polyhedron rotating mirror 10 can also be a pentahedron or other polyhedron structure.

[0035] After step S100, the steps of the laser energy receiving method further include the following steps: S200, inputting the first light beam along the first direction to the reflecting surface of the rotating polygonal mirror, and the first light beam is reflected to form a first image plane; S300, inputting the second light beam along the second direction to the reflecting surface of the rotating polygonal mirror, and the second light beam is reflected to form a second image plane, wherein the first direction and the second direction are opposite.

[0036] Specifically, as shown in Figures 1 and 2, in an energy transmission scenario, a first light beam is input to the reflective surface of the polygonal rotating mirror 10 along a first direction, and a second light beam is input to the reflective surface of the polygonal rotating mirror 10 along a second direction. The first direction and the second direction are opposite, that is, the first light beam and the second light beam are input to the polygonal rotating mirror 10 along a pair of opposite directions, and the first light beam and the second light beam are laser beams of equal power. In the present invention, the first direction and the second direction are described as a pair of opposite directions in the vertical direction.

[0037] Furthermore, during the energy transmission process, the polygonal mirror 10 is always in a high-speed rotation state. In the present invention, the polygonal mirror 10 can rotate clockwise or counterclockwise. Thus, when the first and second light beams are input into the polygonal mirror 10, they will respectively impinge on a reflective surface of the polygonal mirror 10. Moreover, at the same time, the first and second light beams impinge on different reflective surfaces of the polygonal mirror 10.

[0038] Thus, when the first and second light beams are input to the polygonal rotating mirror 10, the high-speed rotating polygonal rotating mirror 10 will reflect the first and second light beams through its various reflective surfaces. Taking the first light beam as an example, as the polygonal rotating mirror 10 rotates, the angle of incidence between the first light beam and the reflective surface of the polygonal rotating mirror 10 will continuously change, thereby causing the reflection angle between the first light beam and the reflective surface of the polygonal rotating mirror 10 to continuously change. That is, as the first light beam continuously impinges on the polygonal rotating mirror 10, it is reflected and forms an arc-shaped first image surface aa on the polygonal rotating mirror 10.

[0039] Similarly, when the second light beam continuously irradiates the polygonal rotating mirror 10 , an arc-shaped second image plane bb is formed on the polygonal rotating mirror 10 after reflection, and the first image plane aa and the second image plane bb are arranged relatively symmetrically.

[0040] When the first light beam is input into the polygonal mirror 10 , when one of the reflection surfaces of the polygonal mirror 10 is perpendicular to the first light beam, according to optical theorem, the corresponding reflected light beam of the first light beam must return along the original path, that is, the corresponding reflection angle is 0°.

[0041] At the same time, the reflected beam of the second beam opposite to the first beam will form an angle of 30° with the other reflecting surface of the polygonal mirror 10 and an angle of 60° with the normal of the reflecting surface, so the corresponding reflection angle of the reflected beam of the second beam is 120°.

[0042] As the polygonal mirror 10 rotates clockwise, of course, the polygonal mirror 10 can rotate in both the clockwise direction and the counterclockwise direction. In the embodiment of the present invention, the clockwise direction is used as an example for description.

[0043] When the polygonal mirror 10 rotates 60° clockwise, according to optical theorem, the reflection angle between the reflected beam of the first light beam and the reflection surface of the polygonal mirror 10 will rotate from 0° to 120°, and the reflection angle between the reflected beam of the second light beam and the reflection surface of the polygonal mirror 10 will rotate from 120° to 0°.

[0044] That is, every time the polygonal mirror 10 rotates by an angle of 60°, the first and second light beams will scan a corresponding 120° image plane on the polygonal mirror 10 after reflection. That is, the first light beam is reflected by the reflective surface of the polygonal mirror 10 to form a first image plane aa, and the second light beam is reflected by the reflective surface of the polygonal mirror 10 to form a second image plane bb. The first image plane aa and the second image plane bb are both imaging planes of the polygonal mirror 10. In the embodiment of the present invention, the first image plane aa and the second image plane bb are both arc-shaped image planes with an angle of 120°. In other embodiments, depending on the change in the structure of the polygonal mirror 10, the first image plane aa and the second image plane bb can also be arc-shaped image planes with other angles.

[0045] Furthermore, in one possible embodiment, the formation of the first and second light beams, as shown in Figures 1 and 2, can include the following steps before step S200: A. providing a laser to emit a laser beam; B. collimating the laser beam emitted by the laser, and splitting the collimated laser beam to form the first and second light beams. Of course, steps A and B can also be provided between step S100, and this is not a limitation here.

[0046] Specifically, first, in the energy transmission scenario, a laser 20 for emitting laser light is provided as a light source generating device for wireless energy transmission. In an embodiment of the present invention, the wavelength of the laser 20 is 808 nm, and the size of its light-emitting surface is 400 μm. In addition, the laser 20 can also be a diode-pumped solid-state laser 20. This solid-state laser 20 not only has the advantages of small size, long life, and reliable operation, but also can have a higher output power, such as 100 kW. At the same time, it can still maintain a high radiance under high power conditions. Therefore, it is also particularly suitable for use in laser wireless energy transmission, as well as lasers 20 that change according to actual use.

[0047] Thus, in this embodiment of the present invention, by providing a laser 20 for emitting laser light as the light source generator for wireless energy transmission, the high energy density and directional transmission characteristics of laser light are utilized to achieve efficient energy transmission and long-distance wireless energy transmission. This helps reduce reliance on power transmission lines and provides a more flexible and convenient power supply method for mobile devices. Moreover, the laser 20 can also provide a reliable energy supply for equipment located in special environments, such as space probes and underwater equipment, greatly expanding its scope and degree of freedom of use.

[0048] Furthermore, in the embodiment of the present invention, by providing the laser 20 for emitting laser light as the light source generator for wireless energy transmission, that is, by utilizing laser light as the medium for energy transmission, energy transmission without electromagnetic radiation can be achieved. This feature helps reduce potential impacts on the environment and humans, achieving a more environmentally friendly and safer effect.

[0049] In step B, after the laser 20 is set up, the laser beam emitted by the laser 20 needs to be collimated. In an embodiment of the present invention, the specific collimation method is to set up a beam expander 30. The beam expander 30 is set on the output optical path of the laser beam output by the laser 20, and the laser beam output by the laser 20 is input into the beam expander 30 for collimation.

[0050] By collimating the laser beam, the divergence angle of the laser beam can be reduced and the laser spot can be enlarged, thereby reducing the energy loss of the laser beam in the air. In an embodiment of the present invention, the beam expander 30 can be a Galilean multiple beam expander 30. The Galilean multiple beam expander 30 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. Both surfaces of the two lenses are coated with 808nm or 1064nm narrowband anti-reflection coating to increase the transmittance of the laser beam.

[0051] Furthermore, in step B, after the laser beam is collimated, the collimated laser beam is split into a first beam and a second beam. In an embodiment of the present invention, a specific splitting method is to provide a beam splitter 40, which is located on the output optical path of the beam expander 30. The beam splitter 40 is used to input the collimated laser beam into the beam splitter 40 for splitting into the first beam and the second beam.

[0052] In an embodiment of the present invention, the beam splitter 40 is an optical element with partial transmission and partial reflection functions. The beam splitter 40 has a splitting ratio of 1:1 and can transmit laser light with a wavelength of 355 nm to 1064 nm. The normal of the beam splitter 40 is oriented upward and maintains a 45° angle with the incident laser beam. The diameter of the beam splitter 40 can be adjusted appropriately based on actual needs. Of course, in other embodiments, a stereo beam splitter 40, a beam splitting wedge, a prism, a polarizing beam splitter 40, or other optical element can be used in place of the beam splitter 40 to perform the beam splitting function.

[0053] In step B, the collimated laser beam is input into the beam splitter for splitting to form a first beam and a second beam. After the collimated laser beam passes through the beam splitter, since the beam splitter 40 has a splitting ratio of 1:1, in this embodiment of the present invention, the collimated laser beam is transmitted through the beam splitter 40 to form the first beam, and a portion of the collimated laser beam is reflected by the beam splitter 40 to form the second beam. The first beam and the second beam are two laser beams with equal power.

[0054] Furthermore, in steps S200 and S300, the process of inputting the first light beam to the reflective surface of the polygonal mirror and the process of inputting the second light beam to the reflective surface of the polygonal mirror specifically include: providing a first reflective component; inputting the first light beam through the first reflective component so that the first light beam is parallel to the first direction after passing through the first reflective component; and providing a second reflective component; inputting the second light beam through the second reflective component so that the second light beam is parallel to the second direction after passing through the second reflective component.

[0055] Specifically, after the laser beam is split into the first beam and the second beam by the beam splitter 40 , the first beam needs to be input to the polygon mirror 10 along a first direction, and the second beam needs to be input to the polygon mirror 10 along a second direction.

[0056] After the collimated laser beam passes through the beam splitter 40, the first beam is formed after the laser beam is transmitted. Therefore, the first beam will maintain the original beam of the original laser beam and continue to transmit, entering the air or other medium for long-distance propagation. At this time, the first beam is perpendicular to the first direction. The second beam is formed after the laser beam is reflected. In this embodiment of the present invention, the angle between the beam splitter 40 and the laser beam is 45°. After reflection, an optical path perpendicular to the propagation direction of the original laser beam is formed. That is, after passing through the beam splitter 40, the second beam is perpendicular to the laser beam and is opposite to the second direction.

[0057] Then, in order to make the first light beam input to the reflecting surface of the polygonal rotating mirror 10 along the first direction, as shown in Figure 2, a first reflecting component 50 is arranged on the light transmission path of the spectrometer 40 of the present invention. In an embodiment of the present invention, the first reflecting component 50 is composed of multiple reflecting mirrors, namely a first reflecting mirror 51, a second reflecting mirror 52 and a third reflecting mirror 53.

[0058] The first light beam transmitted from the beam splitter 40 passes through the first reflective assembly 50, undergoes multiple reflections, and is rotated 90° before being finally reflected and output from the third reflective mirror 53. The first light beam reflected from the third reflective mirror 53 is parallel to the first direction, meaning that the first light beam can be input along the first direction onto the reflective surface of the rotating polygonal mirror 10.

[0059] Similarly, in order to allow the second light beam to be input into the reflecting surface of the polygonal rotating mirror 10 along the second direction, as shown in Figure 2, a second reflecting component 60 is arranged on the reflecting light path of the spectrometer 40 of the present invention. In an embodiment of the present invention, the second reflecting component 60 is composed of multiple reflecting mirrors, namely a fourth reflecting mirror 61 and a fifth reflecting mirror 62.

[0060] The second light beam reflected from the beam splitter 40 passes through the second reflective assembly 60, undergoes multiple reflections, and is rotated 180° before being finally reflected and output from the fifth reflective mirror 62. The second light beam reflected from the fifth reflective mirror 62 is parallel to the second direction, meaning that the second light beam can be input along the second direction onto the reflective surface of the rotating polygonal mirror 10.

[0061] Thus, the first light beam transmitted from the beam splitter 40 is reflected by the first reflector 51, the second reflector 52, and the third reflector 53 in sequence, ultimately forming a first light beam along a first direction, which is then irradiated onto the reflective surface of the polygonal rotating mirror 10 in the first direction. The second light beam reflected from the beam splitter 40 is reflected by the fourth reflector 61 and the fifth reflector 62 in sequence, ultimately forming a second light beam along a second direction, which is then irradiated onto the other reflective surface of the polygonal rotating mirror 10 in the second direction. Thus, the arrangement of the first reflective assembly 50 and the second reflective assembly 60 forms two laser beams transmitted to the reflective surface of the polygonal rotating mirror 10, and the two laser beams have equal power and propagate in opposite directions.

[0062] Furthermore, in this embodiment of the present invention, each reflector in the first reflective assembly 50 and the second reflective assembly 60 is a plane reflector comprising a flat mirror surface, each surface of which includes a reflective film, typically made of metal or other reflective material. The thickness and material of the reflective film can be designed and fabricated based on specific wavelengths and reflection requirements. Each mirror surface of each reflector in this embodiment of the present invention is capable of maintaining a constant laser intensity when reflecting laser light.

[0063] Because different types of reflectors may have different reflection mechanisms and application scenarios, in other embodiments, each reflector may be configured as, for example, an ordinary reflector, a high reflector, a laser line reflector, an ultrafast reflector, etc. Depending on specific needs, different types of reflectors may be selected to achieve laser reflection.

[0064] Furthermore, after step S300, the laser energy receiving method further comprises the following step: S400, arranging photovoltaic arrays on the first image plane and the second image plane.

[0065] Specifically, in the laser energy receiving method described in the invention, photovoltaic arrays (not shown) are fixedly provided on the first image plane aa formed by the reflection of the first light beam and on the second image plane bb formed by the reflection of the second light beam. Each photovoltaic array is composed of a plurality of flexible photovoltaic cells connected in series, that is, a plurality of photovoltaic cells are provided on the two imaging surfaces of the polyhedron rotating mirror 10, the first image plane aa and the second image plane bb. Photovoltaic cells can be made of a variety of materials, such as single crystal silicon, polycrystalline silicon, GaAs, and indium gallium arsenide (InGaAs). The characteristic of these materials is that their band gap width matches that of lasers with a wavelength of 808nm or 1000nm, and therefore have excellent photoelectric conversion efficiency.

[0066] When laser light shines on the photovoltaic cells in the photovoltaic array, the silicon material of the photovoltaic cells absorbs photons and transfers the energy of the photons to silicon atoms. This process causes electrons to jump, forming a potential difference, thereby generating photocurrent.

[0067] Thus, in the present invention, the photovoltaic arrays are provided on the arc-shaped first image plane aa and the second image plane bb, and the polyhedron rotating mirror 10 continuously scans the photovoltaic arrays on the two image planes by reflecting the first light beam and reflecting the second light beam, and because the first light beam and the second light beam are laser beams with the same power, the two laser beams will irradiate from the first photovoltaic cell of the photovoltaic array to the last photovoltaic cell in sequence, so that each photovoltaic cell on the two photovoltaic arrays can obtain the same amount of light.

[0068] Moreover, because the high-rotation polyhedron mirror 10 can rotate at a speed of picoseconds or even femtoseconds, the optical scanning speed of the polyhedron mirror 10 can reach picoseconds or even faster, while the circuit conversion is only in the nanosecond order. Therefore, every time the polyhedron mirror 10 scans the photovoltaic array once by reflecting the first and second light beams, it is equivalent to the laser irradiating all photovoltaic cells in the photovoltaic array. There is no problem of the order of irradiation time, that is, each photovoltaic cell in the photovoltaic array can obtain the same light intensity, and accordingly, the same photocurrent and voltage are generated. Then, the photovoltaic array with each photovoltaic cell connected in series will not have circuit loss, and the total output power is equal to the sum of the output powers of each photovoltaic cell. Therefore, the laser energy receiving method provided by the present invention can achieve the effect of improving the conversion efficiency of laser wireless energy transmission.

[0069] Moreover, the first image plane aa and the second image plane bb formed by the reflection of the first light beam and the reflection of the second light beam by the reflection surface of the polyhedron rotating mirror 10 form two identical 120° arc-shaped photovoltaic receiving surfaces on the polyhedron rotating mirror 10. Compared with the existing technology, the laser energy receiving method provided by the present invention significantly increases the area of ​​the photovoltaic receiving surface, thereby increasing the energy of the transmitted laser and thus improving the overall output power.

[0070] In addition, the laser energy receiving method provided by the present invention changes the traditional flat-plate photovoltaic receiver into two 120° arc-shaped photovoltaic receiving surfaces at the receiving end, so that the receiving end structure can meet the scanning requirements of the ultra-high-speed rotating mirror, thereby obtaining high-speed scanning laser irradiation, ensuring that each photovoltaic cell obtains the same illumination, thereby forming a uniform light effect at the receiving end, solving the energy loss problem caused by uneven light in laser wireless energy transmission from the receiving end, and achieving the effect of efficient utilization of laser and stable energy transmission.

[0071] Furthermore, in other embodiments, an intelligent control system may be provided within the environment, communicating with the polygonal mirror 10 through the intelligent control system. The intelligent control system can automatically adjust the rotation speed of the polygonal mirror 10, the selection of the reflective surface, and the laser incident angle based on the real-time operating status and energy demand of the photovoltaic cells in the photovoltaic array. In this manner, dynamic adjustment and optimization of laser energy can be achieved, thereby improving the performance and stability of energy transmission.

[0072] In addition, further, after step S400, the laser energy receiving method provided by the present invention may further include the step: S500, connecting the photovoltaic arrays arranged on the first image plane and the second image plane in series with an external circuit.

[0073] Specifically, by connecting the photovoltaic arrays on the first image plane aa and the second image plane bb in series with an external circuit, the circuit can obtain a maximum current output, thereby achieving the effect of improving the energy conversion efficiency of laser wireless energy transmission.

[0074] Based on the same invention, this application also provides an energy transmission system based on the aforementioned laser energy receiving method. As shown in Figure 2, the energy transmission system includes a rotatable polygonal mirror 10, a laser 20, a beam splitter 40, and a photovoltaic array. In this embodiment of the present invention, the polygonal mirror 10 is a trihedron with three reflective surfaces. The three reflective surfaces form an equilateral triangle cross-section, and the polygonal mirror 10 rotates around the center of the inscribed circle of the equilateral triangle.

[0075] The polygonal rotating mirror 10 has multiple reflective surfaces; the laser 20 is used to emit a laser beam, and the beam splitter 40 is arranged on the output optical path of the laser 20 to split the laser beam into a first beam and a second beam. The first beam is input into the reflective surface of the rotating polygonal rotating mirror 10 along a first direction, and the first beam is reflected to form a first image plane aa; the second beam is input into the reflective surface of the rotating polygonal rotating mirror 10 along a second direction, and the second beam is reflected to form a second image plane bb. The photovoltaic array is arranged on the first image plane aa and the second image plane bb. The photovoltaic array specifically includes: a plurality of photovoltaic cells connected in series.

[0076] Furthermore, the energy transmission system also includes: a beam expander 30, a first reflective component 50 and a second reflective component 60. The beam expander 30 is arranged on the light output path of the laser 20 and is located between the laser 20 and the beam splitter 40, and is used to collimate the laser beam output by the laser 20. The first reflective component 50 is arranged on the light transmission path of the beam splitter 40, and the first reflective component 50 is composed of a plurality of reflectors, specifically including: a first reflector 51, a second reflector 52 and a third reflector 53. The second reflective component 60 is arranged on the reflection light path of the beam splitter 40, and the second reflective component 60 is composed of a plurality of reflectors, specifically including: a fourth reflector 61 and a fifth reflector 62.

[0077] In the energy transmission system, the optical path propagation is specifically as follows: First, the laser 20 continuously emits a laser beam. The laser beam emitted from the laser 20 is input into the beam expander 30 for collimation, thereby reducing the divergence angle of the laser beam and increasing the laser spot size, thereby reducing the energy loss of the laser beam in the air. The beam expander 30 can specifically be a Galilean multiple beam expander 30.

[0078] After being collimated by the beam expander 30, the laser beam will be input into the beam splitter 40. The beam splitter 40 has a splitting ratio of 1:1 and is capable of transmitting laser beams with a wavelength of 355nm-1064nm. In an embodiment of the present invention, the normal of the mirror surface of the beam splitter 40 is upward and maintains an angle of 45° with the incident laser beam. In this way, the collimated laser beam will be partially transmitted and partially reflected by the beam splitter 40, that is, the partially collimated laser beam is transmitted through the beam splitter 40 to form a first beam, and the partially collimated laser beam is reflected by the beam splitter 40 to form a second beam. Because the splitting ratio of the beam splitter 40 is 1:1, the first beam and the second beam are two laser beams with the same power.

[0079] The first light beam transmitted from the beam splitter 40 is reflected by the first reflector 51, the second reflector 52, and the third reflector 53 in sequence, ultimately forming a first light beam along a first direction. The first light beam is then irradiated onto the reflective surface of the polygonal rotating mirror 10. Similarly, the second light beam reflected from the beam splitter 40 is reflected by the fourth reflector 61 and the fifth reflector 62 in sequence, ultimately forming a second light beam along a second direction. The second light beam is then irradiated onto the other reflective surface of the polygonal rotating mirror 10. Thus, the arrangement of the first reflective assembly 50 and the second reflective assembly 60 forms two laser beams transmitted to the reflective surface of the polygonal rotating mirror 10. The two laser beams have equal power and propagate in opposite directions.

[0080] When the first and second light beams are input to the polygonal rotating mirror 10, the polygonal rotating mirror 10, which is rotating at high speed, will reflect the first and second light beams through its various reflective surfaces. Taking the first light beam as an example, when the polygonal rotating mirror 10 rotates, the incident angle between the first light beam and the reflective surface of the polygonal rotating mirror 10 will continuously change, thereby causing the reflection angle between the first light beam and the reflective surface of the polygonal rotating mirror 10 to continuously change. That is, when the first light beam continuously illuminates the polygonal rotating mirror 10 along the first direction, it will form an arc-shaped first image plane aa on the polygonal rotating mirror 10 after reflection; similarly, when the second light beam continuously illuminates the polygonal rotating mirror 10 along the second direction, it will form an arc-shaped second image plane bb on the polygonal rotating mirror 10 after reflection. In an embodiment of the present invention, the first image plane aa and the second image plane bb are both arc-shaped image planes with an angle of 120°.

[0081] Moreover, the energy transmission system of the present invention is fixedly provided with photovoltaic arrays on the first image plane aa formed by the reflection of the first light beam and on the second image plane bb formed by the reflection of the second light beam. The photovoltaic array is composed of a plurality of flexible photovoltaic cells connected in series, that is, a plurality of photovoltaic cells are arranged on the imaging surface of the polyhedron rotating mirror 10.

[0082] In this way, the photovoltaic array is arranged on the arc-shaped first image plane aa and the second image plane bb, and the photovoltaic array on the first image plane aa and the second image plane bb is continuously scanned by reflecting the first light beam and the second light beam through the polyhedron rotating mirror 10. Because the first light beam and the second light beam are laser beams with the same power, the two laser beams will irradiate from the first photovoltaic cell of the photovoltaic array to the last photovoltaic cell in sequence, so that the two photovoltaic arrays can obtain the same amount of light.

[0083] Since the light scanning speed can reach the order of picoseconds or even faster, while the circuit conversion is only in the order of nanoseconds, each time the polyhedron mirror 10 scans the photovoltaic array by reflecting the first and second light beams, it is equivalent to the laser irradiating all the photovoltaic cells in the photovoltaic array. There is no problem of the order of irradiation time, that is, each photovoltaic cell in the photovoltaic array can obtain the same light intensity, and accordingly, the same photocurrent and voltage are generated. Then, the photovoltaic array that connects each photovoltaic cell in series will not have circuit loss, and the total output power is equal to the sum of the output power of each photovoltaic cell. Therefore, the energy transmission system provided by the present invention can achieve the effect of improving the conversion efficiency of laser wireless energy transmission.

[0084] Furthermore, in one possible embodiment, an intelligent control system can be incorporated into the energy transmission system. This intelligent control system, in communication with the polygonal mirror 10, can automatically adjust the rotation speed of the polygonal mirror 10, the choice of reflective surface, and the laser incident angle based on the real-time operating status and energy requirements of the photovoltaic cells in the photovoltaic array. This allows for dynamic adjustment and optimization of laser energy, improving the performance and stability of energy transmission.

[0085] Furthermore, in a possible implementation manner, the photovoltaic arrays provided on the first image plane aa and the second image plane bb may be connected in series with an external circuit.

[0086] Specifically, by connecting each of the photovoltaic arrays in series with an external circuit, the circuit can obtain a maximum current output, thereby achieving the effect of improving the energy conversion efficiency of laser wireless energy transmission.

[0087] Thus, the laser energy receiving method and energy transmission system provided by the present invention fix a photovoltaic array composed of flexible photovoltaic cells on the imaging surface of a polygonal rotating mirror, forming a single row of arc-shaped photovoltaic array receiving ends. Laser light transmitted over a long distance is reflected by the high-speed rotating polygonal rotating mirror and focused on a photovoltaic cell at the photovoltaic array receiving end for photoelectric conversion, converting light into electricity and outputting electrical energy.

[0088] Due to the high-speed rotation of the polyhedron mirror, the position of the laser irradiating the receiving end of the arc-shaped photovoltaic array will change, that is, it will irradiate each photovoltaic cell of the arc-shaped photovoltaic array in a clockwise or counterclockwise manner, thereby performing photoelectric conversion in turn and outputting electrical power.

[0089] Because the rotation speed of the high-rotating polygonal mirror can reach the picosecond or even femtosecond level, which is much higher than the nanosecond level of photoelectric conversion of photovoltaic cells, each time the laser scans the receiving end of the arc-shaped photovoltaic array, it is equivalent to the same power laser irradiating each photovoltaic cell in the photovoltaic array once, so it can generate electrical power with the same output power. After the circuits are connected in series, the maximum current output can be obtained, thereby achieving the effect of improving the energy conversion efficiency of laser wireless energy transmission.

[0090] In the present invention, the specific structure and working principle of the present invention are introduced by taking the laser energy receiving method and the energy transmission system as examples. However, the application of the present invention is not limited to the laser energy receiving method and the energy transmission system, and can also be applied to the use of other similar devices.

[0091] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A laser energy receiving method, characterized in that, Including the steps of: Providing a rotatable polyhedron mirror, which is configured to have a plurality of reflecting surfaces; Inputting a first light beam in a first direction onto the reflecting surface of the rotating polyhedron mirror, and the first light beam is reflected to form a first image plane; Inputting a second light beam in a second direction onto the reflecting surface of the rotating polyhedron mirror, and the second light beam is reflected to form a second image plane, wherein the first direction and the second direction are opposite; Providing a photovoltaic array on the first image plane and the second image plane.

2. The laser energy receiving method according to claim 1, characterized in that, The first light beam and the second light beam have the same power.

3. The laser energy receiving method according to claim 2, characterized in that Before the step of inputting the first light beam in the first direction onto the reflecting surface of the rotating polyhedron mirror and reflecting to form the first image plane, it includes: Providing a laser, and emitting a laser beam through the laser; Collimating the laser beam emitted by the laser, and splitting the collimated laser beam into a first light beam and a second light beam spectroscopically.

4. The laser energy receiving method according to claim 3, wherein The step of collimating the laser beam emitted by the laser and splitting the collimated laser beam into a first light beam and a second light beam spectroscopically includes: Providing a beam expander and a beam splitter, and the beam splitter is located on the output optical path of the beam expander; Inputting the laser beam into the beam expander for collimation; Inputting the collimated laser beam into the beam splitter for splitting into a first light beam and a second light beam spectroscopically.

5. The laser energy receiving method according to claim 4, characterized in that The step of inputting the collimated laser beam into the beam splitter for splitting into a first light beam and a second light beam spectroscopically includes: A part of the collimated laser beam is transmitted through the beam splitter to form the first light beam; A part of the collimated laser beam is reflected by the beam splitter to form the second light beam.

6. The laser energy receiving method according to claim 3, wherein The step of inputting the first light beam in the first direction onto the reflecting surface of the rotating polyhedron mirror includes: Providing a first reflecting assembly; Inputting the first light beam through the first reflecting assembly, so that after the first light beam passes through the first reflecting assembly, the first light beam is parallel to the first direction.

7. The laser energy receiving method according to claim 3, wherein The step of inputting the second light beam in the second direction onto the reflecting surface of the rotating polyhedron mirror includes: Providing a second reflecting assembly; Inputting the second light beam through the second reflecting assembly, so that after the second light beam passes through the second reflecting assembly, the second light beam is parallel to the second direction.

8. An energy transmission system based on the laser energy receiving method according to any one of claims 1 to 7, characterized in that, Including: A rotatable polyhedron mirror, a laser, a beam splitter and a photovoltaic array, and the polyhedron mirror has a plurality of reflecting surfaces; The laser is used for emitting a laser beam, and the beam splitter is arranged on the output optical path of the laser for splitting the laser beam into a first light beam and a second light beam spectroscopically; Wherein, the first light beam is input in the first direction onto the reflecting surface of the rotating polyhedron mirror, and the first light beam is reflected to form a first image plane; The second light beam is input in the second direction onto the reflecting surface of the rotating polyhedron mirror, and the second light beam is reflected to form a second image plane; The photovoltaic array is provided on the first image plane and the second image plane.

9. The energy transfer system according to claim 8, wherein It further includes: A beam expander, which is arranged on the light output path of the laser and is located between the laser and the beam splitter for collimating the laser beam output by the laser.

10. The energy transfer system according to claim 8, characterized in that, The photovoltaic array includes: a plurality of photovoltaic cells connected in series.

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