CN115811148A

CN115811148A - Laser wireless energy transmission system with self-protection function

Info

Publication number: CN115811148A
Application number: CN202211558089.4A
Authority: CN
Inventors: 李立; 高正欣; 燕世雄; 白冰; 刘佳琳; 田凤军
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2023-03-17

Abstract

The invention provides a laser wireless energy transmission system with a self-protection function, which comprises a laser emitting system, a laser transmission light path system and a laser receiving system. The laser emission system includes: the system comprises a transmitting terminal control center, a laser system, a 360-degree rotary table system, a protective light receiving system and a GPS positioning system; the laser transmission light path system comprises a beam splitter, a beam expanding and collimating system and a light spot local re-beam expanding system; the laser receiving system comprises a receiving end control center, a plane displacement table system, a GPS positioning system, a photovoltaic cell, a heat dissipation device, a maximum power point tracking circuit (MPPT), a DC-DC exchange circuit, a storage battery and a power management system thereof. The self-protection function of the laser wireless energy transmission system can be realized under the conditions of reducing peripheral equipment and system complexity. Meanwhile, the energy distribution of the laser beam can be easily changed, and the photoelectric conversion efficiency on the photovoltaic cell is improved.

Description

Laser wireless energy transmission system with self-protection function

Technical Field

The invention relates to the field of energy transmission, in particular to a laser wireless energy transmission system with a self-protection function.

Background

In recent years, with the appearance and popularization of various mobile devices, people increasingly want to get rid of the constraint of traditional line charging, and use more flexible and diversified charging modes, and the wireless charging technology comes along with the advent.

The wireless energy transmission (WPT) technology has been developed so far, and mainly includes near-field wireless energy transmission based on electromagnetic induction and electromagnetic resonance, and long-distance wireless energy transmission based on microwave or laser. WPT is currently internationally recognized as one of the most leading and revolutionary technologies in the field of energy transmission, which would subvert the traditional wired (wire) transmission mode.

The laser has the advantages of good directivity, good monochromaticity, energy concentration and the like, so that the laser wireless energy transmission technology is unique in various wireless energy transmission technologies. In addition, the total weight of equipment, volume and system required by laser wireless energy transmission is far smaller than that of the same microwave transmission device, so that the laser wireless energy transmission device is concerned by researchers in multiple fields, and the laser wireless energy transmission technology has an important application prospect in the aspect of medium-distance and long-distance transmission.

Since the energy of the laser spot is in accordance with the gaussian distribution, the laser spot is usually "homogenized" in practice, so as to improve the efficiency of photovoltaic power generation. In patent No. CN209879068U, a "light guide plate" is used to homogenize the energy distribution of a laser beam. The light guide plate is densely provided with the microarray structure, so that the manufacturing cost is higher. In addition, the incident light beam is scattered multiple times through the light guide plate to achieve the purpose of homogenizing the light energy distribution, however, this method will often cause the light energy to be absorbed, resulting in energy loss. In patent No. CN210744763U, a protective light source and its corresponding auxiliary structure are separately provided, which increases the complexity of the whole system. Compare in this patent and adopt the lens structure, change the energy distribution of laser facula, simple structure, convenient operation. In addition, since the energy of the laser is relatively concentrated, the high-power laser is more dangerous, and thus, the safety problem of operators is urgently needed to be solved when the laser is used for wireless energy transmission. This patent only adopts a laser source, has both realized the effect of wireless biography ability through the mode of beam split, has also realized the self preservation of system simultaneously and has protected the function, and system architecture is simple relatively.

Disclosure of Invention

The invention aims to provide a laser wireless energy transmission system with a self-protection function.

The purpose of the invention is realized by the following steps: the system integrally comprises a laser emitting system, a laser transmission optical path system and a laser receiving system. The laser emission system includes: a transmitting terminal control center 2, a laser system 3, a 360-degree turntable system 5, a protective light receiving system 4 and a GPS (global positioning system) 1; the laser transmission optical path system 6 comprises a beam splitter 22, a reflector 23, beam expanding and collimating systems 24-25 and a light spot local re-beam expanding system 26; the laser receiving system comprises a receiving end control center 12, a plane displacement platform system 11, a GPS (global positioning system) 13, a photovoltaic cell and heat dissipation device 7, a maximum power tracking circuit 8, a DC-DC (direct current-direct current) exchange circuit 9, a storage battery and a power management system 10 thereof.

The laser system comprises a laser output end, a laser heat dissipation device and the like, and the subsystem is used for providing laser output. The laser output end is arranged on a 360-degree rotary table system 5, the laser emission direction can be adjusted under the control of an emission end control center 2, and meanwhile, a light reflecting structure shown in the attached drawing 2 is arranged on the laser output end and is matched with the light reflecting structure arranged on the photovoltaic cell and the heat dissipation device 7 together to form protective light. The protection light receiving system comprises an optical probe 14 and a plane displacement platform, wherein the optical probe is used for receiving transmitted protection light, is arranged on the plane displacement platform and is controlled by a transmitting terminal control center 2, and can move to different positions in a plane.

The laser transmission optical path system 6 uses the beam splitter 22 to split the laser output from the laser output end into two beams of light with different energy, the strong light is used for photovoltaic power generation of the photocell, and the weak light becomes "protection light" around the system after being reflected and transmitted by the reflector 23 structure. The beam expanding and collimating system 24-25 consists of a concave lens and a convex lens and amplifies laser spots. The spot local re-beam expanding system 26 is composed of a lens with a structure similar to that in fig. 3, and can perform re-amplification operation on the local laser spot, so as to change the energy distribution of the original laser spot.

The photovoltaic cells and the heat sink 7 of the laser receiver system are provided with reflecting structures 15-18 as shown in fig. 2, which cooperate with reflecting structures 19-20 on the laser output side as described in claim 2 to participate in the generation of the protection light. In addition, the photovoltaic cell and heat sink 7 is mounted on a planar displacement table system 11, which is controlled by a receiving end control center 12.

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 respectively acquire position information of the laser output port 21, the optical probe 14, and the photovoltaic cell 27 and transmit the position information to corresponding control centers, and the two control centers perform information exchange and processing, and then control the movement of the 360-degree turntable system 5, the planar displacement table system 11, and the displacement platform at the protective optical receiving system 4, so that the optical paths of the systems are aligned. At this time, after the laser emitted from the laser output end is split by the splitting sheet 22, the strong light continues to be transmitted forward, passes through the beam expanding collimation system 24-25 and the spot local re-beam expanding system 26 in sequence, and finally irradiates on the photovoltaic cell and the heat dissipation device 7 to realize photovoltaic conversion. The electricity generated by the photovoltaic cell and the heat dissipation device is stabilized through a maximum power tracking circuit 8 and a DC-DC exchange circuit 9 in sequence and finally input into a storage battery and a power management system 10 thereof; the weak light is reflected by the reflector 23 and then transmitted to the photovoltaic cell and the reflecting structures 15-18 on the heat dissipation device 7, and then is transmitted between the laser emitting system and the laser receiving system for multiple times and finally received at the position of the protective light receiving system, at the moment, the protective light around the total system is generated, and a protective area is formed at the periphery of the system.

The storage battery and the power management system 10 thereof are controlled by the receiving end control center 12, when the storage battery is fully charged, the receiving end control center arranges the charging work of the load to be charged and feeds back information to the transmitting end control center 2, and the transmitting end control center controls the laser transmitting system to stop laser output. The spot local re-beam expanding system 26 can select lenses of the same type with different structures or increase or decrease the number of the lenses to realize light beam homogenization effects of different degrees according to actual needs; the protection light with different quantity can be generated around the system by adjusting the positions and the quantity of the photovoltaic cell, the heat dissipation device 7, the reflectors at the laser output end and the like, so that the protection degree of the protection area is changed, and the system is suitable for various situations. Once a foreign object enters a "protection area" of the system, that is, "protection light" at the periphery of the system is shielded, the protection light receiving system 4 cannot receive the "protection light" transmitted back, and at this time, the transmitting end control center 2 adjusts the laser power output by the laser system to "protect" the foreign object.

Compared with the prior art, the invention has the beneficial effects that: the invention provides a novel laser homogenization technology, namely, a spot local re-beam expansion system is introduced into a light path of a laser wireless energy transmission system to perform re-beam expansion operation on a local part of a laser spot, so that the energy distribution condition of laser received by a photovoltaic cell is changed, and the photovoltaic conversion efficiency is improved. The method is simple and easy to implement and has flexibility. The energy transmission function and the self-protection function of the system are realized simultaneously by using only one laser source, and the peripheral quantity and the system complexity of the system are reduced. The light spot local re-beam expanding system can select lenses of the same type with different structures according to actual requirements, and even can change the using quantity of the lenses, so that the light beam homogenization effect of different degrees is realized; the self-protection function of the system can also generate different amounts of protection light around the system by adjusting the positions and the amounts of the photovoltaic cell, the heat dissipation device, the laser output end and the like of the reflectors, so as to change the protection degree of the protection area and even the shape of the protected area, and the system is suitable for various situations.

Drawings

FIG. 1 is a diagram showing the overall system structure;

FIG. 2 is a schematic diagram of the position between the laser output, the optical probe, the laser transmission optical path system and the photovoltaic cell and heat sink; the black line segments with arrows in fig. 2 represent the laser beam transmitted in the system. The black dotted line segments in the light path represent the laser participating in the process of re-expanding in the laser spots;

FIG. 3 is a block diagram of a lens usable with a spot local re-beam expansion system;

fig. 4 is a system work flow diagram.

In the figure: 1. a GPS positioning system; 2. a transmitting end control center; 3. a laser system; 4. protecting the light receiving system; 5. a 360 ° turret system; 6. a laser transmission optical path system; 7. a photovoltaic cell and a heat sink; 8. a maximum power tracking circuit (MPPT); 9. a DC-DC switching circuit; 10. a storage battery and a power management system thereof; 11. a planar displacement table system; 12. a receiving end control center; 13. a GPS positioning system; 14. an optical probe; 15-20, a light reflecting structure; 21. a laser output port; 22. a beam splitter; 23. a reflective mirror; 24-25, a beam expanding collimation system; 26. a light spot local re-beam expanding system; 27. a photovoltaic cell; 28. a beam expander for performing a local re-beam expansion operation; 29. a laser high lens; 30. a lens outer frame; 31. a support rod.

Detailed Description

The invention is described in further detail below with reference to the drawings and the detailed description.

The invention relates to a laser wireless energy transmission method with a self-protection function. The laser emission system includes: the system comprises a transmitting end control center, a laser system, a 360-degree rotary table system, a protective light receiving system and a GPS positioning system; the laser transmission light path system comprises a beam splitter, a beam expanding and collimating system and a light spot local re-beam expanding system; the laser receiving system comprises a receiving end control center, a plane displacement table system, a GPS (global positioning system), a photovoltaic cell, a heat dissipation device, a Maximum Power Point Tracking (MPPT), a DC-DC (direct current-direct current) exchange circuit, a storage battery and a power management system thereof. The laser system comprises a laser output end, a laser heat dissipation device and the like, and the subsystem is used for providing laser output. The laser output end is arranged on a 360-degree rotary table system, the laser emission direction can be adjusted under the control of the control center of the emission end, and meanwhile, a light reflecting structure shown in the attached drawing 2 is arranged on the laser output end and is matched with the photovoltaic cell and the light reflecting structure arranged on the heat dissipation device to form protective light.

The protection light receiving system comprises a light probe and a plane displacement platform, wherein the light probe is used for receiving transmitted protection light, is arranged on the plane displacement platform and is controlled by a transmitting terminal control center, and can move to different positions in a plane.

The laser output from the laser output end is divided into two beams of light with different energy by using the light splitting sheet, strong light is used for photovoltaic power generation of the photocell, and weak light is reflected and transmitted by the reflector structure to form protective light around the system.

The beam expanding and collimating system consists of a concave lens and a convex lens and is used for primarily amplifying laser spots. The light spot local re-beam expanding system is composed of lenses of structures in the attached drawing 3, and the beam expanding lens with the beam expanding function is arranged in the middle of each lens, so that the local re-beam expanding operation of the laser light spots is realized, the energy distribution of the original laser light spots is changed, and the homogenization target is achieved.

The photovoltaic cell and the heat dissipation device are provided with a light reflection structure as shown in the attached figure 2, and the light reflection structure is matched with the light reflection structure on the laser output end to participate in generating protective light. In addition, the photovoltaic cell and the heat dissipation device are installed on the plane displacement table system, and the plane displacement table system can be controlled to move by the receiving end control center.

When the laser wireless energy transmission system starts to work, the transmitting end control center controls the laser transmitting system to emit weaker laser, meanwhile, the GPS positioning system at the laser transmitting system and the GPS positioning system at the laser receiving system respectively acquire the position information of the laser output end, the optical probe and the photovoltaic cell and transmit the position information to the corresponding control centers, information exchange is carried out between the two control centers, the 360-degree rotary table system, the plane displacement table system and the displacement platform at the position of the protection optical receiving system are controlled to move after processing, and the light paths of the systems are aligned. At the moment, after the laser emitted from the laser output end is split by the beam splitter, the strong light is continuously transmitted forwards and sequentially passes through the beam expanding collimation system and the light spot local re-beam expanding system, and finally irradiates the photovoltaic cell and the heat dissipation device to realize photovoltaic conversion. Electricity generated by the photovoltaic cell and the heat dissipation device is firstly output at the maximum power point through a Maximum Power Point Tracking (MPPT) circuit, then is subjected to voltage stabilization and rectification through a DC-DC exchange circuit, and finally is input into a storage battery and a power management system thereof; weak light is transmitted to the photovoltaic cell and a reflecting structure on the heat dissipation device after being reflected by the reflecting mirror, then is transmitted for multiple times between the laser emitting system and the laser receiving system and is finally received at the position of the protective light receiving system, at the moment, protective light around the total system is generated, and a protective area is formed at the periphery of the system. The storage battery and the power management system thereof are controlled by the receiving end control center, when the storage battery is fully charged, the receiving end control center arranges the charging work of the load to be charged and feeds back the charging work to the transmitting end control center, and the transmitting end control center controls the laser transmitting system to stop laser output and the system to stop working.

During the working period of the system, when a foreign object enters a protection area of the system, namely the protection light at the periphery of the system is shielded, the protection light receiving system cannot receive the protection light transmitted back, and at the moment, the transmitting end control center can adjust the laser power output by the laser system to protect the foreign object.

The first embodiment is as follows: as shown in the working flow of fig. 4, the control center at the transmitting end of the system first receives the start-up command from the operator, and the system starts to work. The power of the output laser when the system starts to work can be set manually, and weak light is generally set to align the light path. The light path alignment work is completed by the coordination of the GPS positioning system and the control center. Before the optical path is misaligned, the system repeats the optical path alignment work. After the light path alignment is completed, the power management system and the receiving end control center of the storage battery monitor that the photovoltaic battery is performing photovoltaic power generation, meanwhile, the optical probe at the protective optical receiving system receives the transmitted protective light, and the transmitting end control center monitors and feeds back the protective light. If the photovoltaic cell normally performs photovoltaic power generation, but the optical probe does not receive 'protection light' due to the fact that foreign matters break into the optical path, the transmitting end control center controls the laser transmitting system to reduce the power of output laser, and when the system detects that the system is in the working state with the foreign matters for a long time, the system automatically shuts down until a starting instruction sent by an operator is received.

Example two: the laser after the primary collimation and expansion completes the operation of're-expansion' at the spot local re-expansion system, as shown in the attached figure 3, the're-expansion lens (28)' can set different curvatures, diameters or shapes and the like to finally realize the homogenization of different effects on the laser. The laser beam high lens (29) has high transmittance for laser beams not participating in further beam expansion, and the transmittance can be freely set according to circumstances.

Example three: the surrounding mode and the density degree of 'protective light' around the system, namely the 'self-protection' area and the 'self-protection' degree of the system can be changed by changing the positions and the number of the optical probe (14) and the light reflecting structures (15) - (20).

In summary, the invention provides a laser wireless energy transmission system with a self-protection function, which comprises a laser emitting system, a laser transmission optical path system and a laser receiving system. Wherein the laser emission system includes: the system comprises a transmitting end control center, a laser system, a 360-degree rotary table system, a protective light receiving system and a GPS positioning system; the laser transmission light path system comprises a beam splitter, a beam expanding and collimating system and a light spot local re-beam expanding system; the laser receiving system comprises a receiving end control center, a plane displacement table system, a GPS (global positioning system), a photovoltaic cell, a heat dissipation device, a Maximum Power Point Tracking (MPPT), a DC-DC (direct current-direct current) exchange circuit, a storage battery and a power management system thereof. This patent falls into two bundles of light that the energy is unequal with the laser that laser emission system sent, and the higher laser beam of energy is used for photovoltaic cell's electricity generation, and the lower light of energy then transmits through the reflection of light structure that sets up on laser emission end and the laser receiving end, and it is finally surveyed and received by protection light receiving system. The advantage of this patent is provided with the local system of restrainting again of facula before shining photovoltaic cell with laser, carries out further beam expanding operation to the local laser facula after restrainting the beam to change the energy distribution of the last received facula of photovoltaic cell, realize the purpose of homogenization laser beam. By the method, the self-protection function of the laser wireless energy transmission system can be realized under the conditions of reducing peripheral equipment and reducing the complexity of the system. Meanwhile, 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 transmission system with self-protection function is characterized in that: the system comprises a laser transmitting system, a laser transmission light path system and a laser receiving system, wherein the laser transmitting system comprises a transmitting end control center (2), a laser system (3), a 360-degree rotary table system (5), a protective light receiving system (4) and a GPS (global positioning system) positioning system (1); the laser transmission light path system (6) comprises a beam splitter (22), a reflector (23), beam expanding and collimating systems (24-25) and a light spot local re-beam expanding system (26); the laser receiving system comprises a receiving end control center (12), a plane displacement table system (11), a GPS (global positioning system) positioning system (13), a photovoltaic cell and 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) thereof; the laser system comprises a laser output end and a laser heat dissipation device; the laser output end is arranged on a 360-degree rotary table system (5), the emission direction of laser can be adjusted under the control of an emission end control center (2), the protection light receiving system comprises a light probe (14) and a plane displacement platform, the light probe is responsible for receiving protection light transmitted back, the protection light receiving system is arranged on the plane displacement platform and is controlled by the emission end control center (2), a laser transmission light path system (6) divides laser output from the laser output end into two beams of light with different energy by using a light splitting sheet (22), strong light is used for photovoltaic power generation of a photocell, and weak light is reflected and transmitted by a reflector (23) structure to form protection light around the system; the beam expanding and collimating system (24-25) consists of a concave lens and a convex lens; the spot local re-beam expanding system (26) consists of a lens, and performs re-amplification operation on the local laser spot to change the energy distribution of the original laser spot; the photovoltaic cell and the heat dissipation device (7) of the laser receiving system are provided with light reflection structures (15-18) which are matched with the light reflection structures (19-20) on the laser output end to participate in generating protective light, the photovoltaic cell and the heat dissipation device (7) are arranged on a plane displacement platform system (11), and the plane displacement platform system can be controlled by a receiving end control center (12) to move.

2. The laser wireless energy transmission system with self-protection function according to claim 1, characterized in that: after a laser emitting system emits laser, a GPS (global positioning system) system (1) at the laser emitting system and a GPS system (13) at the laser receiving system respectively acquire position information of a laser output end port (21), an optical probe (14) and a photovoltaic cell (27) and transmit the position information to corresponding control centers, and the two control centers exchange information and control a 360-degree rotary table system (5), a plane displacement table system (11) and a displacement platform at a protection optical receiving system (4) to move after processing so as to align the optical paths of the systems; at the moment, after laser emitted from the laser output end is split by the splitting piece (22), strong light is continuously transmitted forwards, sequentially passes through the beam expanding collimation system (24-25) and the light spot local re-beam expanding system (26), and irradiates on the photovoltaic cell and the heat dissipation device (7) to realize photovoltaic conversion; the electricity generated by the photovoltaic cell and the heat dissipation device is stabilized through a maximum power tracking circuit (8) and a DC-DC exchange circuit (9) in sequence and finally input into a storage battery and a power management system (10) thereof; the weak light is transmitted to the photovoltaic cell and a reflecting structure (15-18) on the heat dissipation device (7) after being reflected by the reflector (23), then the weak light is transmitted between the laser emitting system and the laser receiving system for a plurality of times and finally received at the position of the protective light receiving system, at the moment, the protective light around the total system is generated, and a protective area is formed at the periphery of the system.

3. The laser wireless energy transmission system with self-protection function according to claim 1, characterized in that: the storage battery and the power management system (10) thereof are controlled by a receiving end control center (12), when the storage battery is fully charged, the receiving end control center arranges charging work on a load to be charged and feeds back information to a transmitting end control center (2), and the transmitting end control center controls the laser transmitting system to stop laser output; the light spot local re-beam expanding system (26) selects lenses of the same type with different structures according to actual needs, or increases or decreases the number of the lenses to realize light beam homogenization effects of different degrees; the positions and the number of the photovoltaic cells, the heat dissipation device (7) and the reflectors at the laser output end are adjusted to generate different amounts of 'protective light' around the system, so that the protection degree of a 'protection area' is changed, and the system is suitable for various situations.

4. The laser wireless energy transmission system with the self-protection function according to claim 3, wherein: if a foreign object enters a 'protection area' of the system, the 'protection light' on the periphery of the system is shielded, the protection light receiving system (4) cannot receive the 'protection light' transmitted back, and at the moment, the transmitting end control center (2) can adjust the laser power output by the laser system to protect the foreign object.