Remote laser wireless energy supply system and method

Abstract

The invention provides a long-distance laser wireless energy supply system and method, the system comprises a laser, an optical machine and a photoelectric conversion cell panel, and the optical machine comprises a convergence mirror group, a fast reflecting mirror and a collimating mirror group; the laser device generates a laser light source, the laser light source generated by the laser device is converged by the converging mirror group and then emitted to the reflecting surface of the fast reflecting mirror, the laser light source is reflected to the collimating mirror group through the reflecting surface of the fast reflecting mirror, and the laser light source is collimated by the collimating mirror group to form parallel light and then emitted; and the photoelectric conversion cell panel is used for receiving the parallel light emitted by the collimating mirror group and carrying out photoelectric conversion to form electric energy required by the load so as to supply power to the load. Stable laser energy supply is carried out on a long-distance battery panel through the system, output of fixed power is achieved, the system is basically not limited by external environments such as weather in an extremely severe environment, and energy storage devices such as a storage battery with potential safety hazards are avoided.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging technology, and in particular to a long-distance laser wireless power supply system and method. Background Art

[0002] With the continuous improvement of photovoltaic power generation technology and technological breakthroughs in photoelectric conversion, many new demands for using light sources for energy supply have been introduced. Light can propagate freely in space, while electricity requires cables and other media to propagate. Batteries can meet high-power and stable energy supply needs in a short period of time, but they cannot effectively replenish energy by themselves. When the power is exhausted, they still need to be replaced manually. In addition, due to the safety considerations of batteries, many application scenarios do not support the use of batteries. In scenarios where it is impossible to lay cables, battery and solar cell power supply are currently the main solutions, but neither can operate stably for a long time.

[0003] At present, there are several similar solutions for converting other energy sources into electrical energy for energy supply:

[0004] 1. Solar cell power supply: The power supply capacity varies greatly depending on the region and environment. When it rains, is cloudy, or at night, the sunshine capacity is weak, and stable power supply demand cannot be guaranteed. The upper limit of power supply can only be increased by increasing the area of ​​the solar panel, and the cleaning and maintenance of large-area solar panels must also be considered. In scenarios where it is impossible to lay cables, battery and solar cell power supply are currently the main solutions, but neither can operate stably for a long time.

[0005] 2. Microwave power supply: The electrical energy is converted into microwaves through a microwave converter, and then the microwaves are sent into space through the microwave transmitting antenna of the transmitting station. After the microwaves are transmitted in space, they reach the ground receiving station. The received microwaves are converted into electrical energy through the converter. Although microwaves can greatly avoid the impact of the environment due to their strong penetrating power, they have large energy losses during long-distance transmission, and long-term exposure to microwave electromagnetic radiation will also affect human health.

[0006] 3. Laser fiber power supply: The output of high-power laser is carried by long-distance optical fiber as a carrier, dragged to the vicinity of the solar panel, and powered by short-distance photoelectric conversion. In essence, laser fiber power supply is still a kind of active power supply, but optical fiber replaces the traditional cable medium, and insulated terminals can be laid to safely pass through some high-voltage environments, and then photoelectric conversion is performed through the solar panel. It adds extra costs and cannot be applied to space power supply without medium. Summary of the invention

[0007] Based on the above records, the present invention provides a long-distance laser wireless power supply system and method, aiming to solve the power supply problem of batteries, solar energy, etc. in the prior art that has certain limitations.

[0008] A long-distance laser wireless energy supply system includes a laser, an optical machine, and a photoelectric conversion battery panel, wherein the optical machine includes a focusing lens group, a fast reflection mirror, and a collimating lens group;

[0009] The laser generates a laser light source, and the focusing lens group focuses the laser light generated by the laser and then emits it to the reflection surface of the fast reflection mirror. The reflection surface of the fast reflection mirror is reflected to the collimating lens group, and the collimating lens group collimates the laser light to form parallel light and then emits it;

[0010] The photoelectric conversion cell panel is used to receive the parallel light emitted by the collimating lens group, and perform photoelectric conversion to form the electric energy required by the load, so as to supply power to the load.

[0011] Furthermore, the optical machine also includes a photoelectric detector and a drive control module, and a reflective sticker is provided in the central area of ​​the photoelectric conversion cell panel;

[0012] When the laser light source emitted from the exit surface of the collimating lens group hits the reflective sticker, it is reflected to form reflected laser;

[0013] The photoelectric detector is used to capture the reflected laser generated by the reflective tape and generate a photoelectric detection signal;

[0014] A drive control module, connected to the photodetector, for generating a drive control signal for controlling the angle adjustment of the reflective surface of the fast reflective mirror based on the photodetection signal, so that the reflective surface of the fast reflective mirror points to the optimal energy supply point;

[0015] The driving mechanism of the quick-reflection mirror is connected to the driving control module and is used to adjust the angle of the reflecting surface of the quick-reflection mirror according to the driving control signal.

[0016] Furthermore, the drive control module includes:

[0017] An energy judgment unit, used to judge the threshold range of the acquired photoelectric detection signal intensity and obtain a judgment result;

[0018] The angle control unit is connected to the energy judgment unit and is used for:

[0019] When the judgment result is that the intensity is greater than the first threshold, a first scanning strategy is adopted to generate a driving control signal to find the best energy supply point;

[0020] When the judgment result is that the intensity is greater than the second threshold value but not greater than the first threshold value, a second scanning strategy is adopted to generate a driving control signal to find the best energy supply point.

[0021] Furthermore, the drive control module is also connected to the laser and also includes:

[0022] The power control unit is connected to the energy judgment unit and the angle control unit respectively, and is used for:

[0023] When the judgment result is that the intensity is greater than the second threshold value but not greater than the first threshold value, a power adjustment signal is generated to reduce the laser emission power, and then a power adjustment signal is generated to increase the laser emission power when the angle control unit finds the optimal energy supply point;

[0024] When the judgment result is that the intensity is not greater than the second threshold, a power adjustment signal for turning off the laser is generated;

[0025] The laser adjusts the emission power of the laser light source according to the power adjustment signal.

[0026] Furthermore, the drive control module also includes:

[0027] a timing unit connected to the energy judgment unit, and configured to, when the judgment result is that the intensity is greater than the second threshold value but not greater than the first threshold value, perform timing to record the duration of the judgment result that the intensity is greater than the second threshold value but not greater than the first threshold value;

[0028] The power control unit is also connected to the timing unit, and is used to generate a power adjustment signal for shutting down the laser when the duration of the intensity being greater than the second threshold and not greater than the first threshold exceeds a predetermined safety time.

[0029] Further, the first scanning strategy is a best approximation scanning strategy; the second scanning strategy is a mid-range circular scanning strategy;

[0030] The angle control unit is also used to: when the laser light source is emitted at the first emission power when the laser is turned on, generate the driving control signal based on the full-range spiral scanning strategy to control the movement of the fast reflection mirror to capture the target position.

[0031] A long-distance laser wireless energy supply method uses the aforementioned long-distance laser wireless energy supply system, the system includes a laser, an optical machine, and a photoelectric conversion battery panel, the optical machine includes a focusing lens group, a fast reflection mirror, and a collimating lens group; a reflective sticker is provided in the central area of ​​the photoelectric conversion battery panel, and the method includes the following steps:

[0032] Step A1, a laser generates a laser light source, which is converged by a convergence mirror group, reflected by a reflection surface of a fast reflection mirror, and collimated by a collimation mirror group to form parallel light, and then emitted, and the parallel light is received by a photoelectric conversion cell panel;

[0033] Step A2, the photoelectric detector captures the reflected laser generated by the reflective tape and generates a photoelectric detection signal;

[0034] Step A3, generating a driving control signal for controlling the reflective surface of the quick reflective mirror to adjust the angle based on the photoelectric detection signal, so that the reflective surface of the quick reflective mirror points to the optimal energy supply point;

[0035] Step A4: the driving mechanism of the quick reflection mirror adjusts the angle of the reflection surface of the quick reflection mirror according to the driving control signal.

[0036] Further, step A3 includes:

[0037] Step A31, determining the threshold range of the acquired photoelectric detection signal intensity:

[0038] If the intensity is greater than the first threshold, executing step A32;

[0039] If the intensity is greater than the second threshold but not greater than the first threshold, execute step A33;

[0040] Step A32, using a first scanning strategy to generate a driving control signal to find the best energy supply point;

[0041] Step A33, using the second scanning strategy to generate a drive control signal to find the best energy supply point.

[0042] Furthermore, in step A31, when it is determined that the photoelectric detection signal strength is not greater than the second threshold, step A34 is also executed;

[0043] In step A33, a power adjustment signal for reducing the laser emission power is also generated, and then when the optimal energy supply point is found according to the second scanning strategy, a power adjustment signal for increasing the laser emission power is generated;

[0044] Step A34, generating a power adjustment signal for turning off the laser;

[0045] The laser adjusts the emission power of the laser light source according to the power adjustment signal.

[0046] Further, in step A31, when it is determined that the intensity of the acquired photoelectric detection signal is greater than the second threshold value and not greater than the first threshold value, timing is performed to record the duration of the intensity being greater than the second threshold value and not greater than the first threshold value;

[0047] In step A33, when the duration of the intensity being greater than the second threshold and not greater than the first threshold exceeds a predetermined safety time, a power adjustment signal for turning off the laser is generated.

[0048] The beneficial technical effect of the present invention is that the long-distance laser energy supply system studied in the present invention has breakthrough key technologies in terms of light source, distance, control, stability, safety, volume and cost. The system provides stable laser energy to the solar panels at a long distance to achieve fixed power output. Except in extremely harsh environments, it is basically not limited by the influence of external environment such as weather, and avoids energy storage devices with safety hazards such as batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 and Figure 5 This is a module schematic diagram of a long-distance laser wireless energy supply system of the present invention;

[0050] Figure 2 A schematic diagram of the position of reflective stickers of a long-distance laser wireless energy supply system of the present invention;

[0051] Figure 3 A schematic diagram of a light spot at an optimal energy supply point of a long-distance laser wireless energy supply system of the present invention;

[0052] Figure 4 A schematic diagram of a long-distance laser wireless energy supply system of the present invention showing that the light spot deviates from the optimal energy supply point;

[0053] Figure 6 and Figure 7 The present invention is a flowchart of the steps of a long-distance laser wireless power supply method. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0055] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0056] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0057] See also Figure 1 The present invention provides a long-distance laser wireless energy supply system, comprising a laser (1), an optical machine (2), and a photoelectric conversion battery panel (3), wherein the optical machine comprises a focusing lens group (21), a fast reflection mirror (22), and a collimating lens group (23);

[0058] The laser (1) generates a laser light source, the focusing lens group (21) focuses the laser light source generated by the laser (1) and then emits it to the reflection surface of the quick reflection mirror (22), and then reflects it to the collimating lens group (23) through the reflection surface of the quick reflection mirror (22), and the collimating lens group (23) collimates the laser light source to form parallel light and then emits it;

[0059] The photoelectric conversion cell panel (3) is used to receive the parallel light emitted by the collimating lens group (23), and perform photoelectric conversion to form the electric energy required by the load, so as to supply power to the load.

[0060] Specifically, the photoelectric conversion battery panel (3) is connected to a voltage stabilizing module (4) to output the electric energy converted by the photoelectric conversion battery panel (3) after voltage stabilization.

[0061] At present, the mature materials used for photoelectric conversion are GaAs and Si. GaAs has a higher photoelectric conversion efficiency for light sources in the 500nm to 900nm band than Si. The photoelectric conversion efficiency of Si is relatively low but can be applied to a wider band of 500nm to 1100nm. The present invention is not limited to the use of a specific material of solar panels, and can be selected based on cost and required output power. The size of the solar panel is adapted according to its saturated power capacity and the actual required power, and it only needs to meet the condition that the saturated power of the solar panel under the area is greater than the required power.

[0062] Currently, there are two types of light sources for mature lasers, LED light sources and semiconductor laser light sources. The present invention is not limited to the type of light source used for the laser. Only the solar panels used in conjunction with the system select a single wavelength according to the highest photoelectric conversion efficiency. For example, when using a GaAs solar panel, the wavelength of the laser is selected to be 808nm. If a Si solar panel is used, the wavelength of the laser is changed to 950nm. The power of the laser is adapted according to the required output power combined with the photoelectric conversion efficiency and the power loss during propagation. The present invention puts forward special requirements for the use of the laser. The switch of the laser needs to be logically controlled, that is, the switch of the laser can be controlled by high and low levels; the output power of the laser needs to be controllable by analog or digital quantity, so that the current laser output power, that is, the emission power, can be changed arbitrarily.

[0063] The long-distance laser energy supply system studied in this invention has breakthrough key technologies in terms of light source, distance, control, stability, safety, volume and cost. The terminal provides stable laser energy to the solar panels at a long distance to achieve fixed power output. Except in extremely harsh environments, it is basically not limited by the influence of external environment such as weather, and avoids energy storage devices with safety hazards such as batteries.

[0064] See also Figure 1 and Figure 2 , further, the optical machine (2) also includes a photoelectric detector (24) and a drive control module (25), and a reflective sticker (5) is provided in the central area of ​​the photoelectric conversion cell panel (3);

[0065] When the laser light source emitted from the output surface of the collimating lens group (21) hits the reflective sticker (5), it is reflected to form reflected laser light;

[0066] The photoelectric detector (24) is used to capture the reflected laser light generated by the reflective tape and generate a photoelectric detection signal;

[0067] A drive control module (25) is connected to the photodetector (24) and is used to generate a drive control signal for controlling the reflection surface of the quick reflection mirror (22) to adjust the angle based on the photodetection signal, so that the reflection surface of the quick reflection mirror (22) points to the optimal energy supply point;

[0068] The driving mechanism of the quick reflection mirror (22) is connected to the driving control module (25) and is used to adjust the angle of the reflection surface of the quick reflection mirror (22) according to the driving control signal.

[0069] Compared with the traditional solar panels, the present invention has been specially modified. For example, taking a 10cm*10cm solar panel as an example, the material layout of the extremely small diameter circle is avoided in the central area of ​​the solar panel, and the loss of sensitivity due to the area is controlled within 1%. Instead, a special reflective film, i.e., a reflective sticker (5), is pasted in its place to realize the tracking function.

[0070] The optical machine (2) converges the laser light source output by the laser into a light spot of a size suitable for the reflective mirror surface of the fast reflector, hits the center of the reflective mirror surface of the fast reflector for reflection, and then is shaped into parallel light by the collimator group and then emitted. The size of the light spot is determined according to the principle of full coverage based on the area of ​​the photovoltaic conversion battery panel used in the system, such as Figure 3 As shown, the output light spot should at least fully cover the photoelectric conversion panel (3). The function of the fast reflector is to change the direction of the emitted light to achieve tracking of distant targets. The photoelectric detector (24) needs to capture the light energy of the emitted light reflected by the reflective sticker at the center of the distant photoelectric conversion panel. The two serve as the output and input of the tracking algorithm for closed-loop control. The tracking algorithm can ensure that the present invention can provide stable energy at a long distance, and the functions it realizes include target position capture and control of the optimal energy supply point.

[0071] The target position capture uses a full-range spiral scanning algorithm based on a fast-reflection mirror. The full-range target position search is performed during the scanning stroke of the fast-reflection mirror, and the sampling value of the photoelectric detector is used to determine whether the target is found. Then continue to track the best power supply point. The best power supply point is controlled to ensure that the output light spot can fully cover the solar panel after capturing the target position (reflective sticker). When the output light spot is not at the best power supply point, Figure 4 As shown, the light spot can only partially cover the solar panel, which will cause:

[0072] (1) Since the light spot can only partially cover the solar panel, it will cause the loss of light energy in the uncovered area, resulting in a decrease in the final output power.

[0073] (2) The uncovered part of the light spot will be converted into load. When the solar panel is in the condition of uneven surface light energy coverage for a long time, it will cause damage to the solar panel and fail to work normally.

[0074] Therefore, the driving control module (25) continuously adjusts the position angle of the fast reflection mirror reflection surface through a tracking algorithm such as a spiral scanning algorithm to find the target position and the best energy supply point.

[0075] The location where the solar panel is installed may not be absolutely stable. For example, if it is on a flexible device, it will swing due to the influence of the environmental wind. If it is on an aircraft or drone, it will move relative to the aircraft due to its own posture adjustment, and even require the aircraft to continue to supply energy during low and high-speed flight. Therefore, the tracking algorithm needs to overcome the relative position changes that may be caused by the above conditions and compensate for them, so as to keep the light spot at the best energy supply point at all times.

[0076] See also Figure 5 , further, the drive control module (25) comprises:

[0077] An energy judgment unit (251) is used to judge the threshold range of the acquired photoelectric detection signal intensity and obtain a judgment result;

[0078] The angle control unit (252) is connected to the energy determination unit (251) and is used for:

[0079] When the judgment result is that the intensity is greater than the first threshold, a first scanning strategy is adopted to generate a driving control signal to find the best energy supply point;

[0080] When the judgment result is that the intensity is greater than the second threshold value but not greater than the first threshold value, a second scanning strategy is adopted to generate a driving control signal to find the best energy supply point.

[0081] Furthermore, the first scanning strategy is a best approximation scanning strategy; and the second scanning strategy is a mid-range circular scanning strategy.

[0082] The sampling of the photoelectric detector requires real-time compensation of background light, so as to overcome the influence of the environment in the working scene, such as the change of sunlight intensity in the morning, noon and evening, the shielding of sunlight by clouds, etc. The specific implementation method of the background light compensation of the present invention is: before capturing the target position (reflective tape), the photoelectric detector collects a group of photoelectric detection signals as background signals under the condition that the laser is turned off, and the photoelectric detection signals can also be formed by mean filtering, and then the drive control module (25) generates a power adjustment signal to control the laser to start emitting the laser light source, and the photoelectric detection signal collected by the photoelectric detector after the laser is turned on is sent to the drive control module (25), and the drive control module (25) compensates the photoelectric detection signal by using the background signal before judging the threshold range of the photoelectric detection signal, that is, the drive control module (25) includes a signal preprocessing unit, and the signal preprocessing unit is used to preprocess the photoelectric detection signal received from the photoelectric detector, and the preprocessing is, for example, background compensation using the background signal.

[0083] The energy judgment unit (251) is connected to the signal preprocessing unit and is used to judge the threshold range of the intensity of the preprocessed photoelectric detection signal to obtain a judgment result.

[0084] The signal preprocessing unit is also used after the target position is captured (after the reflective tape is captured). The preprocessing method includes using an adaptive Kalman filter algorithm to follow and compensate for environmental changes on the photoelectric detection signal, thereby realizing the ability to compensate for environmental changes. Specifically, each time the entire laser power supply system is powered on, the photodetector performs background light compensation. Whenever the optimal power supply point changes and the laser is turned on again, the fast mirror restarts tracking and aiming and performs background light compensation again, that is, the drive control module controls the laser to be turned off to obtain the background signal again for compensation. Taking into account the differences in background light in different time periods, especially in the morning, noon and evening, the drive control module can control the laser to be turned off once at intervals to perform background signal compensation.

[0085] After the long-distance laser wireless energy supply system is installed in place, it is manually coarsely positioned. After the coarse positioning is completed, the system is manually powered on. The system will first perform initialization and background light collection, that is, the drive control module (25) is initialized, and the photoelectric detector is controlled to collect and process the photoelectric detection signal to obtain the background signal. After that, the laser is controlled to be turned on. After the laser is turned on, the drive control module (25) generates a power adjustment signal for the laser to emit a laser light source at a first transmission power. For safety and energy saving considerations, the first transmission power is generally low power. First, a low-power laser such as a laser with the first transmission power is used to capture the target and complete the pointing of the optimal energy supply point. When the quick reflector points to the position of the optimal energy supply point, the drive control module (25) generates a power adjustment signal for the laser to emit a laser light source at a second transmission power, and the high-power output of the laser is turned on to start the formal energy supply. The second transmission power is greater than the first transmission power. During the energy supply process, the drive control module (25) controls the photoelectric detector to collect the reflected laser at a fixed frequency to obtain a photoelectric detection signal, thereby realizing the tracking and aiming of the reflective sticker and adjusting the reflective surface of the quick reflector to point to the optimal energy supply point.

[0086] Furthermore, the drive control module (25) is also connected to the laser (1), and further comprises:

[0087] The power control unit (253) is connected to the energy determination unit (251) and the angle control unit (252) respectively, and is used for:

[0088] When the judgment result is that the intensity is greater than the second threshold value but not greater than the first threshold value, a power adjustment signal is generated to reduce the laser emission power, and then a power adjustment signal is generated to increase the laser emission power when the angle control unit finds the optimal energy supply point;

[0089] When the judgment result is that the intensity is not greater than the second threshold, a power adjustment signal for turning off the laser is generated;

[0090] The laser (1) adjusts the emission power of the laser light source according to the power adjustment signal.

[0091] Specifically, the first threshold is 90% of the saturation value of the photodetector.

[0092] Specifically, the second threshold is 70% of the saturation value of the photodetector.

[0093] The saturation value of a photodetector refers to the point at which the detector output signal no longer increases linearly with the light intensity when the incident light intensity increases to a certain level. The saturation value represents the maximum light intensity that the photodetector can accurately measure. Once the incident light intensity exceeds this threshold, the output signal will no longer truly reflect the change in light intensity.

[0094] When the laser power emitted by the laser is relatively large during power supply, for example, the second emission power, if the photoelectric detector detects that the intensity of the reflected laser is stronger than the first threshold, it means that the reflective sticker target is being tracked. Therefore, the drive control module (25) adopts the first scanning strategy to perform a small-range scan to obtain the best power supply point. The specific first scanning strategy is the best approach scanning strategy. The best approach scanning strategy is specifically: taking the current position of the fast reflection mirror as the center of the circle, scanning in a circular direction with a fixed radius. If the signal strength value of the current scanning point is greater than the signal strength value of the center of the circle during the scanning process, the reflective surface of the fast reflection mirror quickly points to the position, and takes the position as the center of the circle to continue the best approach scanning, thereby finding the best functional point.

[0095] When supplying energy, the laser power emitted by the laser is relatively large, such as the second emission power. If the photodetector detects that the intensity of the reflected laser is not greater than the first threshold and greater than the second threshold, it indicates that the solar panel may be partially blocked or the solar panel may move in a small range due to environmental reasons such as wind disturbance. At this time, the second scanning strategy is used to point to the best energy supply point. For safety reasons, the emission power of the laser is lowered to search for the best energy supply point at a low power, such as reducing it to the second emission power. The second scanning strategy is a medium-range circular scanning strategy, that is, scanning a whole circle with a fixed radius and fixed interval angle. The point with the largest signal strength value in the whole circle and the center of the circle is used as the position where the fast reflection mirror reflection surface quickly points to, and a circle with a fixed radius is walked with this as the center to find the best energy supply point.

[0096] Furthermore, the drive control module (25) further comprises:

[0097] A timing unit (254), connected to the energy judgment unit (251), for timing to record the duration of the judgment result that the intensity is greater than the second threshold and not greater than the first threshold when the judgment result is that the intensity is greater than the second threshold and not greater than the first threshold;

[0098] The power control unit (253) is also connected to the timing unit (254) for generating a power adjustment signal for shutting down the laser when the duration of the intensity being greater than the second threshold and not greater than the first threshold exceeds a predetermined safety time.

[0099] Specifically, the power control unit (253) is also used for:

[0100] After generating a power adjustment signal to turn off the laser when the duration of the intensity being greater than the second threshold and not greater than the first threshold exceeds a predetermined safety time, generating a power adjustment signal to turn on the laser to emit the laser light source at the first emission power;

[0101] When the judgment result is that the intensity is not greater than the second threshold, after generating a power adjustment signal to turn off the laser, a power adjustment signal to turn on the laser to emit the laser light source at the first emission power is generated;

[0102] The angle control unit (252) is also used to: when the laser is turned on to emit the laser light source at the first emission power, control the movement of the fast reflection mirror based on the full-range spiral scanning strategy to capture the target position.

[0103] Each time the laser is turned off and then restarted, a background signal must be acquired to perform background compensation for the subsequent photoelectric detection signal. Each time the laser is turned on, a large-range spiral scanning strategy is first executed using low emission power to capture the target. After the target is captured, a medium-range circular scanning strategy is executed to search for the best energy supply point. After finding the best energy supply point, a high emission power is turned on for energy supply. The situations in which the laser is turned on include: (1) the laser is turned on for the first time, (2) the photoelectric conversion panel moves in a small range or partially blocks the reflective sticker, resulting in the photoelectric detector only partially capturing the laser signal reflected by the reflective sticker (between the first threshold and the second threshold) and exceeding the predetermined safety time, the laser is turned off and then turned on again (executed by the drive control module), (3) the reflective sticker is completely blocked in the subsequent process, or the photoelectric conversion panel moves in a large range due to wind disturbance, resulting in the photoelectric detector not capturing the reflective sticker, the laser is turned off and then turned on again (executed by the drive control module).

[0104] See also Figure 6 The present invention also provides a long-distance laser wireless energy supply method, using the aforementioned long-distance laser wireless energy supply system, the system includes a laser, an optical machine, and a photoelectric conversion battery panel, the optical machine includes a focusing lens group, a fast reflection mirror, and a collimating lens group; the central area of ​​the photoelectric conversion battery panel is provided with a reflective sticker, and the method includes the following steps:

[0105] Step A1, a laser generates a laser light source, which is converged by a convergence mirror group, reflected by a reflection surface of a fast reflection mirror, and collimated by a collimation mirror group to form parallel light, and then emitted, and the parallel light is received by a photoelectric conversion cell panel;

[0106] Step A2, the photoelectric detector captures the reflected laser generated by the reflective tape and generates a photoelectric detection signal;

[0107] Step A3, generating a driving control signal for controlling the reflecting surface of the fast reflection mirror to adjust the angle based on the photoelectric detection signal;

[0108] Step A4: the driving mechanism of the quick reflection mirror adjusts the angle of the reflection surface of the quick reflection mirror according to the driving control signal.

[0109] The long-distance laser energy supply system studied in this invention has breakthrough key technologies in terms of light source, distance, control, stability, safety, volume and cost. The terminal provides stable laser energy to the solar panels at a long distance to achieve fixed power output. Except in extremely harsh environments, it is basically not limited by the influence of external environment such as weather, and avoids energy storage devices with safety hazards such as batteries.

[0110] See also Figure 7 , further, step A3 comprises:

[0111] Step A31, determining the threshold range of the acquired photoelectric detection signal intensity:

[0112] If the intensity is greater than the first threshold, executing step A32;

[0113] If the intensity is greater than the second threshold but not greater than the first threshold, execute step A33;

[0114] Step A32, using a first scanning strategy to generate a driving control signal to find the best energy supply point;

[0115] Step A33, using the second scanning strategy to generate a drive control signal to find the best energy supply point.

[0116] Furthermore, in step A31, when it is determined that the photoelectric detection signal strength is not greater than the second threshold, step A34 is also executed;

[0117] In step A33, a power adjustment signal for reducing the laser emission power is also generated, and then when the optimal energy supply point is found according to the second scanning strategy, a power adjustment signal for increasing the laser emission power is generated;

[0118] Step A34, generating a power adjustment signal for turning off the laser;

[0119] The laser adjusts the emission power of the laser light source according to the power adjustment signal.

[0120] Specifically, the first scanning strategy is a best approximation scanning strategy, and the second scanning strategy is a mid-range circular scanning strategy.

[0121] Further, in step A31, when it is determined that the intensity of the acquired photoelectric detection signal is greater than the second threshold value and not greater than the first threshold value, timing is performed to record the duration of the intensity being greater than the second threshold value and not greater than the first threshold value;

[0122] In step A33, when the duration of the intensity being greater than the second threshold and not greater than the first threshold exceeds a predetermined safety time, a power adjustment signal for turning off the laser is generated.

[0123] The type and wavelength of the laser mentioned in the invention are only an option, but are not limited to the types mentioned. The system can also operate normally by replacing different types of lasers. The material type of the solar panel mentioned in the invention is only an option, and the system can also operate normally by replacing other materials that can achieve similar functions. The avoidance layout of the solar panel and the posting of reflective strips are the special features of this system.

[0124] The present invention realizes point-to-point target energy supply in a wireless form over a long distance by laser, and the energy supply terminal has the ability to capture and track the target, allowing the energy supply target to have a certain relative position change, and can also overcome the impact of normal environmental changes on the energy supply. The present invention can be used in scenarios where the power supply of traditional solar panels is insufficient or unstable, and the rated power is supplied by laser. The present invention can be used in scenarios where energy cannot be supplied in an active form, but it requires that there must be no fixed obstructions in the energy supply optical path in space. Compared with the prior art, the present invention has achieved the following breakthroughs:

[0125] 1. It uses passive energy supply, which does not require the laying of optical fibers, cables and other media, and directly uses lasers for transmission in space.

[0126] 2. It can provide energy to long-range targets within a distance of 120 meters.

[0127] 3.Unaffected by daily environmental changes except under extreme conditions.

[0128] 4. When the energy supply target moves, it has a certain tracking ability and can still maintain stable energy supply.

[0129] 5. There is no need for a fixed guidance beacon light during tracking and aiming, and a low-power power laser can be used directly to capture the target.

[0130] 6. If there is any abnormal object blocking the energy supply process, the laser output power will be quickly reduced to within the safety line for safety reasons.

[0131] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A long-distance laser wireless energy supply system, characterized in that: It includes a laser, an optical machine, and a photoelectric conversion cell panel, wherein the optical machine includes a focusing lens group, a fast reflection mirror, and a collimating lens group; The laser generates a laser light source, the focusing lens group focuses the laser light source generated by the laser and then emits it to the reflection surface of the fast reflection mirror, and then reflects it to the collimating lens group through the reflection surface of the fast reflection mirror, and the collimating lens group collimates the laser light source to form parallel light and then emits it; The photoelectric conversion cell panel is used to receive the parallel light emitted by the collimating lens group, and perform photoelectric conversion to form the electric energy required by the load, so as to supply power to the load.

2. A long-distance laser wireless energy supply system as claimed in claim 1, characterized in that: The optical machine also includes a photoelectric detector and a drive control module, and a reflective sticker is provided in the central area of ​​the photoelectric conversion cell panel; The laser light source emitted from the exit surface of the collimating lens group is reflected when it hits the reflective sticker to form reflected laser; The photoelectric detector is used to capture the reflected laser generated by the reflective tape and generate a photoelectric detection signal; The driving control module is connected to the photodetector and is used to generate a driving control signal for controlling the angle adjustment of the reflective surface of the fast reflective mirror based on the photodetection signal, so that the reflective surface of the fast reflective mirror points to the optimal energy supply point; The driving mechanism of the quick-reflection mirror is connected to the driving control module, and is used to adjust the angle of the reflecting surface of the quick-reflection mirror according to the driving control signal.

3. A long-distance laser wireless energy supply system as claimed in claim 2, characterized in that: The drive control module comprises: An energy judgment unit, used to judge the threshold range of the acquired photoelectric detection signal intensity and obtain a judgment result; An angle control unit, connected to the energy judgment unit, is used to: When the judgment result is that the intensity is greater than the first threshold, a first scanning strategy is adopted to generate the driving control signal to find the best energy supply point; When the judgment result is that the intensity is greater than the second threshold value but not greater than the first threshold value, a second scanning strategy is adopted to generate the driving control signal to find the optimal energy supply point.

4. A long-distance laser wireless energy supply system as claimed in claim 3, characterized in that: The drive control module is also connected to the laser and further comprises: A power control unit is connected to the energy judgment unit and the angle control unit respectively, and is used for: When the judgment result is that the intensity is greater than the second threshold value but not greater than the first threshold value, a power adjustment signal for reducing the laser emission power is generated, and then a power adjustment signal for increasing the laser emission power is generated when the angle control unit finds the optimal energy supply point; When the judgment result is that the intensity is not greater than the second threshold, generating the power adjustment signal for turning off the laser; The laser adjusts the emission power of the laser light source according to the power adjustment signal.

5. A long-distance laser wireless energy supply system as claimed in claim 4, characterized in that: The drive control module also includes: a timing unit connected to the energy judgment unit, and configured to, when the judgment result is that the intensity is greater than the second threshold and less than the first threshold, perform timing to record the duration of the judgment result that the intensity is greater than the second threshold and less than the first threshold; The power control unit is also connected to the timing unit, and is used to generate the power adjustment signal for shutting down the laser when the duration of the intensity being greater than the second threshold and not greater than the first threshold exceeds a predetermined safety time.

6. A long-distance laser wireless energy supply system as claimed in claim 3, characterized in that: The first scanning strategy is a best approximation scanning strategy; the second scanning strategy is a mid-range circular scanning strategy; The angle control unit is also used to: when the laser light source is emitted at the first emission power when the laser is turned on, generate the driving control signal based on the full-range spiral scanning strategy to control the movement of the fast reflection mirror to capture the target position.

7. A long-distance laser wireless energy supply method, characterized in that: A long-distance laser wireless energy supply system as described in any one of claims 2 to 6 is used, the system includes a laser, an optical machine, and a photoelectric conversion battery panel, the optical machine includes a focusing lens group, a fast reflection mirror, and a collimating lens group; the central area of ​​the photoelectric conversion battery panel is provided with a reflective sticker, and the method includes the following steps: Step A1, the laser generates a laser light source, which is converged by the converging mirror group, reflected by the reflecting surface of the fast reflection mirror, collimated by the collimating mirror group to form parallel light, and then emitted, and the parallel light is received by the photoelectric conversion cell panel; Step A2, the photoelectric detector captures the reflected laser generated by the reflective tape and generates a photoelectric detection signal; Step A3, generating a driving control signal for controlling the reflection surface of the fast reflection mirror to adjust the angle based on the photoelectric detection signal, so that the reflection surface of the fast reflection mirror points to the optimal energy supply point; Step A4: the driving mechanism of the quick reflection mirror adjusts the angle of the reflection surface of the quick reflection mirror according to the driving control signal.

8. A long-distance laser wireless energy supply method as claimed in claim 7, characterized in that: The step A3 comprises: Step A31, determining the threshold range of the acquired photoelectric detection signal intensity: If the intensity is greater than the first threshold, executing step A32; If the intensity is not greater than the first threshold, executing step A33; Step A32, using a first scanning strategy to generate the driving control signal to find the best energy supply point; Step A33, using a second scanning strategy to generate the driving control signal to find the optimal energy supply point.

9. A long-distance laser wireless energy supply method as claimed in claim 8, characterized in that: In the step A31, when it is determined that the photoelectric detection signal strength is greater than the third threshold value but not greater than the second threshold value, step A34 is further executed; In the step A33, a power adjustment signal for reducing the laser emission power is also generated, and then when the optimal energy supply point is found according to the second scanning strategy, the power adjustment signal for increasing the laser emission power is generated; Step A34, generating the power adjustment signal for turning off the laser; The laser adjusts the emission power of the laser light source according to the power adjustment signal.

10. A long-distance laser wireless energy supply method as claimed in claim 9, characterized in that: In the step A31, when it is determined that the intensity of the photoelectric detection signal obtained is greater than the second threshold value and not greater than the first threshold value, timing is performed to record the duration of the intensity being greater than the second threshold value and not greater than the first threshold value; In the step A33, when the duration of the intensity being greater than the second threshold and not greater than the first threshold exceeds a predetermined safety time, the power adjustment signal for turning off the laser is generated.

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