A laser wireless energy transmission system with self-protection function

Abstract

The application provides a laser wireless energy transmission system with a self-protection function, comprising a laser emission system, a laser transmission optical path system and a laser receiving system. The laser emission system comprises an emission end control center, a laser system, a 360-degree rotating table system, a protective light receiving system and a GPS positioning system; the laser transmission optical path system comprises a light splitting plate, a beam expanding and collimating system and a local beam spot expanding system; the laser receiving system comprises a receiving end control center, a planar displacement table system, a GPS positioning system, a photovoltaic cell and a heat dissipation device, a maximum power tracking circuit (MPPT), a DC-DC exchange circuit, a storage battery and a power management system thereof. The patent can realize the self-protection function of the laser wireless energy transmission system under the condition of reducing peripherals and reducing system complexity. Meanwhile, the energy distribution of the laser beam can be changed more easily, and the photoelectric conversion efficiency on the photovoltaic cell is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy transmission, and is a laser wireless energy transmission system with self-protection function. BACKGROUND

[0002] In recent years, with the emergence and popularity of various mobile devices, people increasingly hope to break free from the shackles of traditional line charging and use more flexible and diversified charging methods. Wireless charging technology has emerged as the times require.

[0003] Wireless power transmission (WPT) technology has developed to the present, mainly including near-field wireless energy transmission based on electromagnetic induction and electromagnetic resonance, and long-distance wireless energy transmission based on microwaves or lasers. WPT has been internationally recognized as a most cutting-edge technology in the field of energy transmission, which will revolutionize the traditional wired (conductor) power transmission mode.

[0004] Laser has the advantages of good directivity, good monochromaticity, and energy concentration, so laser wireless energy transmission technology stands out among various wireless energy transmission technologies. In addition, the equipment, volume and total weight of laser wireless energy transmission are much smaller than those of similar microwave transmission devices, so it has attracted the attention of researchers in many fields. Laser wireless energy transmission technology has important application prospects in medium and long distance transmission.

[0005] Because the energy of the laser spot conforms to the Gaussian distribution, the laser spot is usually "homogenized" in practice to improve the efficiency of photovoltaic power generation. In the patent with the patent number CN209879068U, a "light guide plate" is used to homogenize the energy distribution of the laser beam. The light guide plate is densely covered with a microarray structure, which is often quite expensive. In addition, it achieves the purpose of homogenizing the light energy distribution by multiple scattering of the incident beam through the light guide plate, but this method often causes the absorption of light energy, resulting in energy loss. In the patent with the patent number CN210744763U, a separate protective light source and the corresponding required auxiliary structure are provided, which increases the complexity of the overall system. Compared with the lens structure used in the present patent, the energy distribution of the laser spot is changed, the structure is simple, and the operation is convenient. In addition, because the energy of the laser is relatively concentrated, high-power laser is more dangerous, so it is urgent to solve the safety problem of the operator when using laser for wireless energy transmission. The present application only uses one laser source, which realizes the function of wireless energy transmission through light splitting, and also realizes the self-protection function of the system, and the structure of the system is relatively simple. SUMMARY

[0006] The present application relates to the field of energy transmission, and is a laser wireless energy transmission system with self-protection function.

[0007] The object of the present application is achieved in that the system as a whole comprises three parts: a laser emission system, a laser transmission optical path system and a laser receiving system. The laser emission system comprises: a transmitting end control center 2, a laser system 3, a 360° turntable system 5, a protective light receiving system 4 and a GPS positioning system 1; the laser transmission optical path system 6 comprises a light splitting plate 22, a mirror 23, a beam expansion collimation system 24-25 and a local spot re-expansion system 26; the laser receiving system comprises a receiving end control center 12, a planar displacement table system 11, a GPS positioning system 13, a photovoltaic cell and heat sink device 7, a maximum power tracking circuit 8, a DC-DC switching circuit 9, a storage battery and its power management system 10.

[0008] The laser system comprises a laser output end, a laser heat sink device and the like, which are used to provide laser output. The laser output end is installed on the 360° turntable system 5, and can adjust the direction of laser emission under the control of the transmitting end control center 2. Meanwhile, it is installed with a reflecting structure as shown in the accompanying drawings, which cooperates with the reflecting structure installed on the photovoltaic cell and heat sink device 7 to form protective light. Figure 2 The protective light receiving system comprises a light probe 14 and a planar displacement platform, and the light probe is responsible for receiving the transmitted protective light, and is installed on the planar displacement platform and controlled by the transmitting end control center 2, so as to be moved to different positions in the plane.

[0009] The laser transmission optical path system 6 uses the light splitting plate 22 to split the laser output from the laser output end into two beams with different energies, and the strong light is used for photovoltaic power generation of the photovoltaic cell, and the weak light is transmitted after being reflected by the mirror 23 structure to become "protective light" around the system. The beam expansion collimation system 24-25 is composed of a concave lens and a convex lens, and the laser spot is enlarged. The local spot re-expansion system 26 is composed of a mirror with a structure as shown in the accompanying drawings, and can perform re-enlargement operation on the local laser spot, so as to change the energy distribution of the original laser spot. Figure 3

[0010] The photovoltaic cell and heat sink device 7 of the laser receiving system are installed with a reflecting structure 15-18 as shown in the accompanying drawings, which cooperates with the reflecting structure 19-20 on the laser output end to participate in the generation of protective light. In addition, the photovoltaic cell and heat sink device 7 are installed on the planar displacement table system 11, and the planar displacement table system can be controlled to move by the receiving end control center 12. Figure 2

[0011] ​​When the laser emitting system emits laser, the GPS positioning system 1 at the laser emitting system and the GPS positioning system 13 at the laser receiving system acquire the position information of the laser output end port 21, the light probe 14 and the photovoltaic cell 27 and transmit the information to the corresponding control center, and the control centers exchange information and process the information to control the movement of the 360° rotating table system 5, the planar displacement table system 11 and the displacement platform at the protective light receiving system 4, so that the optical path of the system is aligned. At this time, the laser emitted from the laser output end is split by the beam splitter 22, and the strong light continues to transmit forward, passes through the beam expansion and collimation system 24-25 and the spot local beam expansion system 26 in turn, and finally irradiates the photovoltaic cell and heat dissipation device 7 to realize photovoltaic conversion. The electricity generated by the photovoltaic cell and heat dissipation device is stabilized by the maximum power tracking circuit 8 and the DC-DC exchange circuit 9 in turn, and finally input to the battery and its power management system 10; the weak light is reflected by the mirror 23 and then transmitted to the light reflecting structure 15-18 on the photovoltaic cell and heat dissipation device 7, and then transmitted between the laser emitting system and the laser receiving system multiple times and finally received at the protective light receiving system. At this time, the "protective light" around the total system is generated, and a "protection zone" is formed around the system.

[0012] The battery and its power management system 10 are controlled by the receiving end control center 12. When the battery is fully charged, the receiving end control center will arrange the charging work for the load to be charged and give information feedback to the transmitting end control center 2, and the transmitting end control center controls the laser emitting system to stop outputting laser. The spot local beam expansion system 26 can select different structures of the same type of lenses according to actual needs, or increase or decrease the number of lenses used, to achieve different degrees of beam homogenization effect; or the positions and numbers of the mirrors at the photovoltaic cell and heat dissipation device 7, the laser output end and the like can be adjusted to generate different amounts of "protective light" around the system, thereby changing the protection degree of the "protection zone" and making the system applicable to various situations. Once a foreign object enters the "protection zone" of the system, that is, the "protective light" around the system is blocked, and the protective light receiving system 4 cannot receive the transmitted "protective light", the transmitting end control center 2 will adjust the laser power output by the laser system to protect the foreign object.

[0013] Compared with the prior art, the present application has the beneficial effects that: the present application proposes a novel laser homogenization technology, that is, by introducing a local spot re-expanding system in the optical path of the laser wireless energy transmission system, a local part of the laser spot is re-expanded, thereby changing the energy distribution of the laser received by the photovoltaic cell and improving the photovoltaic conversion efficiency. The method is simple and easy to implement, and is quite flexible. Only one laser source is used to simultaneously realize the energy transmission function and the "self-protection" function of the system, thereby reducing the number of external devices and the complexity of the system. The local spot re-expanding system can select different structures of the same type of lenses according to actual needs, and even the number of such lenses can be changed, thereby realizing different degrees of beam homogenization effect; the "self-protection" function of the system can also be realized by adjusting the positions and numbers of the mirrors at the photovoltaic cell and the heat dissipation device, the laser output end and the like to generate different numbers of "protective light" around the system, thereby changing the protection degree of the "protection area" or even the shape of the protected area, so that the system is suitable for various situations. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a system overall structure diagram;

[0015] Figure 2 is a position structure diagram among the laser output end, the optical probe, the laser transmission optical path system and the photovoltaic cell and the heat dissipation device; Figure 2 The black line segment with an arrow in the middle represents the laser beam transmitted in the system. The black dashed line segment in the optical path represents the laser in the laser spot participating in the "re-expanding" process;

[0016] Figure 3 is a lens structure diagram available for the local spot re-expanding system;

[0017] Figure 4 is a system work flow diagram.

[0018] In the figure: 1, GPS positioning system; 2, transmitting end control center; 3, laser system; 4, protective light receiving system; 5, 360° turntable system; 6, laser transmission optical path system; 7, photovoltaic cell and heat dissipation device; 8, maximum power tracking circuit (MPPT); 9, DC-DC exchange circuit; 10, battery and power management system; 11, planar displacement table system; 12, receiving end control center; 13, GPS positioning system; 14, optical probe; 15-20, reflective structure; 21, laser output end port; 22, beam splitter; 23, mirror; 24-25, beam expanding and collimating system; 26, local spot re-expanding system; 27, photovoltaic cell; 28, expanding mirror for "local re-expanding" operation; 29, laser high-transparency lens; 30, lens outer frame; 31, support rod. DETAILED DESCRIPTION

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] This invention relates to a method for wireless laser power transmission with self-protection function. The system comprises three parts: a laser emitting system, a laser transmission optical path system, and a laser receiving system. The laser emitting system includes: a transmitter control center, a laser system, a 360° turntable system, a protective light receiving system, and a GPS positioning system. The laser transmission optical path system includes a beam splitter, a beam expander and collimator system, and a local beam re-expansion system. The laser receiving system includes a receiver control center, a planar displacement stage system, a GPS positioning system, photovoltaic cells and heat dissipation devices, a maximum power point tracking (MPPT) circuit, a DC-DC switching circuit, a battery, and its power management system. The laser system includes a laser output terminal and a laser heat dissipation device, etc., and this subsystem is used to provide laser output. The laser output terminal is mounted on the 360° turntable system and can adjust the direction of laser emission under the control of the transmitter control center. It also has the following components attached... Figure 2 The reflective structure shown works in conjunction with the reflective structures installed on the photovoltaic cells and heat dissipation device to form a protective light.

[0021] The protective light receiving system includes an optical probe and a planar displacement platform. The optical probe is responsible for receiving the transmitted "protective light". It is installed on the planar displacement platform and controlled by the transmitting end control center. It can be moved to different positions in the plane.

[0022] A beam splitter is used to split the laser output from the laser output end into two beams of different energies. The strong beam is used for photovoltaic power generation in the photovoltaic cell, while the weak beam is reflected by a mirror structure and then becomes "protective light" around the system.

[0023] The beam expanding and collimating system consists of a concave lens and a convex lens, which initially magnifies the laser spot. The local beam re-expansion system consists of an auxiliary lens... Figure 3 The lens is composed of a medium-sized structure, in which the central part is a beam expander with a beam-expanding function, thereby realizing the local re-expansion of the laser spot, thereby changing the energy distribution of the original laser spot and achieving the goal of homogenization.

[0024] The photovoltaic cells and heat dissipation devices are equipped with the following: Figure 2 The reflective structure, in conjunction with the reflective structure on the laser output end, participates in generating protective light. Furthermore, photovoltaic cells and heat dissipation devices are mounted on a planar displacement stage system, which can be moved under the control of the receiving end control center.

[0025] The laser wireless energy transmission system starts to work, first by the transmitting end control center control laser emission system to send weak laser, at the same time the GPS positioning system at the laser emission system and the GPS positioning system at the laser receiving system respectively obtain the position information of the laser output end, optical probe and photovoltaic cell and give the corresponding control center, the information exchange between the two control centers, after processing, control 360 ° turntable system, plane displacement table system and the displacement platform at the protection light receiving system movement, so that the light path of the system is aligned. At this time, the laser emitted from the laser output end is split by the beam splitter, the strong light continues to transmit and passes through the beam expansion and collimation system, the spot local beam expansion system in turn, and finally irradiates the photovoltaic cell and heat dissipation device to realize photovoltaic conversion. The electricity generated by the photovoltaic cell and heat dissipation device first passes through the maximum power tracking circuit (MPPT) to make the system output at the maximum power, and then passes through the DC-DC exchange circuit to stabilize and rectify, and finally input to the storage battery and its power management system; the weak light is reflected by the reflector and transmitted to the light reflecting structure on the photovoltaic cell and heat dissipation device, and then it is transmitted between the laser emission system and the laser receiving system for many times and finally received at the protection light receiving system. At this time, the "protective light" around the total system is generated, and a "protection zone" is formed around the system. The storage battery and its power management system are controlled by the receiving end control center. When the storage battery is fully charged, the receiving end control center will arrange the charging work for the load to be charged and give feedback to the transmitting end control center. The transmitting end control center controls the laser emission system to stop the laser output, and the system stops working.

[0026] During the system operation, when a foreign object enters the "protection zone" of the system, that is, the "protective light" around the system is blocked, and the protection light receiving system cannot receive the transmitted "protective light", at this time the transmitting end control center will adjust the laser power output of the laser system to protect the foreign object.

[0027] Embodiment one: as shown in the accompanying Figure 4The workflow shown, the transmitting end control center of the system first receives the start-up instruction of the operator, the system starts to work. The output laser power size when the system starts to work can be set artificially, generally set weaker light to align the light path. The light path alignment work is coordinated by the GPS positioning system and the control center of each place. Before the light path is aligned, the system repeatedly performs the light path alignment work. After the light path is aligned, the power management system of the battery and the receiving end control center will monitor that the photovoltaic cell is working, at the same time, the protection light probe at the light receiving system will receive the "protection light" transmitted back, the transmitting end control center will monitor and feedback. Although the photovoltaic cell is working normally, if the light probe does not receive the "protection light" due to the intrusion of foreign matter in the light path, the transmitting end control center will control the laser emission system to reduce the output power of the laser, and when the system detects that it is in this state for a long time, the system will automatically shut down until the operator receives the start-up instruction.

[0028] Example two: after the initial collimation and beam expansion, the laser completes the "re-expansion" operation at the spot local re-expansion system, as shown in the attached Figure 3 The "re-expansion mirror (28)" can set different curvatures, diameters or shapes to finally achieve different effects of uniformization of the laser. The laser high-transmission lens (29) is high-transmission to the laser that does not participate in further expansion, and its transmission rate can also be freely set according to the situation.

[0029] Example three: this patent can change the surrounding way and density of "protection light" of the system by changing the position and number of light probes (14) and reflective structures (15)-(20), that is, change the "self-protection" area and "self-protection" degree of the system.

[0030] In summary, the application is a kind of laser wireless energy transmission system with self-protection function, which comprises a laser emission system, a laser transmission optical path system and a laser receiving system. The laser emission system comprises a transmitting end control center, a laser system, a 360° turntable system, a protective light receiving system and a GPS positioning system; the laser transmission optical path system comprises a beam splitter, a beam expanding and collimating system and a local spot re-expanding system; the laser receiving system comprises a receiving end control center, a planar displacement table system, a GPS positioning system, a photovoltaic cell and a heat dissipation device, a maximum power tracking circuit (MPPT), a DC-DC exchange circuit, a storage battery and a power management system. The patent divides the laser emitted by the laser emission system into two beams with different energy, the laser beam with higher energy is used for power generation of the photovoltaic cell, and the laser beam with lower energy is transmitted through the reflective structure arranged on the laser emission end and the laser receiving end, and finally detected and received by the protective light receiving system. The advantage of the patent is that the local spot re-expanding system is arranged before the laser irradiates the photovoltaic cell, the local laser spot after beam expanding is further expanded, so as to change the energy distribution of the received spot on the photovoltaic cell and realize the purpose of uniformizing the laser beam. Through the above method, the self-protection function of the laser wireless energy transmission system can be realized under the condition of reducing external devices and system complexity. At the same time, the energy distribution of the laser beam can be easily changed, and the photoelectric conversion efficiency of the photovoltaic cell is improved.

Claims

1. A laser wireless energy transfer system with self-protection function, characterized in that: The application relates to a laser transmission system, which comprises a laser emission system, a laser transmission light path system and a laser receiving system, wherein the laser emission system comprises an emission end control center (2), a laser system (3), a 360-degree rotating table system (5), a protective light receiving system (4) and a GPS positioning system (1); the laser transmission light path system (6) comprises a light splitting piece (22), a mirror (23), a beam expanding and collimating system (24-25) and a light spot local re-expanding system (26); the laser receiving system comprises a receiving end control center (12), a plane displacement table system (11), a GPS positioning system (13), a photovoltaic cell and a heat dissipation device (7), a maximum power tracking circuit (8), a DC-DC exchange circuit (9), a storage battery and a power management system (10); the laser system comprises a laser output end and a laser heat dissipation device; the laser output end is installed on the 360-degree rotating table system (5) and can adjust the laser emission direction under the control of the emission end control center (2); the protective light receiving system comprises a light probe (14) and a plane displacement platform; the light probe is responsible for receiving the transmitted protective light and is installed on the plane displacement platform and controlled by the emission end control center (2); the laser transmission light path system (6) uses the light splitting piece (22) to split the laser output from the laser output end into two beams with different energies; the strong light is used for photovoltaic power generation of the photovoltaic cell, and the weak light is reflected and transmitted through the mirror (23) structure and becomes the protective light around the system; the beam expanding and collimating system (24-25) is composed of a concave lens and a convex lens; the light spot local re-expanding system (26) is composed of a lens and performs local re-amplification operation on the laser light spot to change the energy distribution of the original laser light spot; the photovoltaic cell and the heat dissipation device (7) of the laser receiving system are installed with a reflecting structure (15-18), which cooperates with the reflecting structure (19-20) on the laser output end to participate in the generation of the protective light; the photovoltaic cell and the heat dissipation device (7) are installed on the plane displacement table system (11), and the plane displacement table system can be controlled to move by the receiving end control center (12).

2. The laser-based wireless energy transfer system with self-protection according to claim 1, wherein: When the laser emitting system emits laser, the GPS positioning system (1) at the laser emitting system and the GPS positioning system (13) at the laser receiving system acquire the position information of the laser output end port (21), the optical probe (14) and the photovoltaic cell (27) and transmit them to the corresponding control center, and the two control centers exchange information and process it to control the movement of the 360° turntable system (5), the plane displacement table system (11) and the displacement platform at the protective light receiving system (4), so that the optical path of the system is aligned; at this time, the laser emitted from the laser output end is split by the beam splitter (22), the strong light continues to transmit forward, passes through the beam expansion and collimation system (24-25) and the spot local beam expansion system (26) in turn, and irradiates the photovoltaic cell and heat dissipation device (7) to realize photovoltaic conversion; the electricity generated by the photovoltaic cell and heat dissipation device is stabilized by the maximum power tracking circuit (8) and the DC-DC exchange circuit (9) in turn, and finally input to the battery and its power management system (10); the weak light is reflected by the mirror (23) and transmitted to the light reflecting structure (15-18) on the photovoltaic cell and heat dissipation device (7), and then it is transmitted between the laser emitting system and the laser receiving system multiple times and finally received at the protective light receiving system, at this time, the "protective light" around the total system is generated, and a "protection zone" is formed around the system.

3. The laser wireless energy transfer system with self-protection function according to claim 1, characterized in that: The battery and its power management system (10) are controlled by the receiving end control center (12), when the battery is fully charged, the receiving end control center will arrange the charging work for the load to be charged and give information feedback to the transmitting end control center (2), and the transmitting end control center controls the laser emitting system to stop laser output; the spot local beam expansion system (26) selects different structures of the same type of lenses according to actual needs, or increases or decreases the number of lenses used, to achieve different degrees of beam homogenization effect; by adjusting the position and number of mirrors at the photovoltaic cell and heat dissipation device (7) and the laser output end, different amounts of "protective light" are generated around the system, and the protection degree of the "protection zone" is changed, so that the system is suitable for various situations.

4. The laser-based wireless energy transfer system with self-protection according to claim 3, wherein: If a foreign object enters the "protection zone" of the system, the "protective light" around the system is blocked, and the protective light receiving system (4) cannot receive the transmitted "protective light", at this time, the transmitting end control center (2) will adjust the laser power output by the laser system to protect the foreign object.

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