Self-adaptive dimming method and system of direct current lighting system

Abstract

The invention relates to the technical field of illumination, in particular to a self-adaptive dimming method and system for a direct current illumination system, and the method comprises the steps: dividing responsibility regions which are not overlapped according to the positions of all illumination points, dividing the responsibility regions into a plurality of grid regions, obtaining the brightness Ln of a central point of each grid region in a non-obstacle shielding state, taking the brightness of the central point as the average brightness of the grid area, setting the optimal number Pmax of pedestrians, judging to obtain target grids and qualified grids according to the average number of pedestrians, marking the qualified grids near the target grids as to-be-detected grids, obtaining the number B of the target grids and the number H of the to-be-detected grids, and determining the number of the to-be-detected grids according to the number B of the target grids and the number H of the to-be-detected grids. And calculating the ratio K of the number of the target grids to the number of the to-be-detected grids, when K is greater than 1, increasing the brightness of the illumination point by one grade by taking delta L as a gradient, when K is equal to 1, not adjusting the brightness of the illumination point, and when K is less than 1, reducing the brightness of the illumination point by one grade by taking delta L as a gradient.

Description

Technical Field

[0001] The present invention relates to the field of lighting technology, and in particular to an adaptive dimming method and system for a direct current lighting system. Background Art

[0002] DC lighting systems use direct current as a power supply, which has better energy efficiency and stability than traditional AC lighting systems. Most existing DC lighting fixtures are LED DC lighting fixtures. Adaptive dimming of the lighting system is an important technology. It detects environmental data and automatically adjusts the brightness of the light source, which not only optimizes the user experience but also significantly reduces energy consumption.

[0003] For common lighting systems, frequent changes in the brightness of LED bulbs will significantly reduce the service life of LED bulbs. Therefore, for a single LED bulb, a fixed lighting power is often used or different numbers of LED bulbs are lit to achieve overall brightness adjustment of the lamp. In the prior art, the brightness of the lamp is mostly adjusted by changing the brightness according to the ambient light intensity, but this method is not applicable when there are a large number of pedestrians. Because pedestrians will cast shadows under the effect of lights, the overlapping shadows may reduce the clarity of the road surface and make the pedestrians' field of vision unclear. Summary of the invention

[0004] The purpose of the present invention is to provide an adaptive dimming method and system for a DC lighting system to solve the above technical problems: The purpose of the present invention can be achieved through the following technical solutions: An adaptive dimming method for a DC lighting system comprises the following steps: S1: Setting a standard brightness value L0 for each lighting point of the lighting system, and using the standard brightness value L0 as the initial brightness of each lighting point when the lighting system is turned on, and setting multiple brightness levels with a preset ΔL as a gradient; S2: dividing non-overlapping responsibility areas according to the positions of the lighting points, and dividing the responsibility areas into grids, where each grid area is a rectangle of the same size; S3: Get the center point brightness L of each grid area without any obstacles n , take the brightness of the center point as the average brightness of the grid area; S4: The average lighting brightness L of each grid area n Set the optimal number of pedestrians P max ; S5: Set the detection period T, obtain the pedestrian number change curve F(x) of each grid area in the detection period T, and calculate the average pedestrian number P of each grid in the detection period i , where Pi represents the average number of pedestrians in the i-th grid area in the current detection cycle, and determines P i ≥P max Is it true, when P i ≥P max When established, it will be i The corresponding grid area is marked as the target grid. i ≥P max If it is not true, then it will be i The corresponding grid area is marked as a qualified grid, all target grids are screened out, and adjacent target grids are merged to form a new target grid; S6: When a target grid appears in the responsible area, mark the qualified grids near the target grid as grids to be detected, obtain the number of target grids B and the number of grids to be detected H, calculate the ratio K of the number of target grids to the number of grids to be detected, and when K>1, increase the brightness of the lighting point by one level with ΔL as the gradient, when K=1, do not adjust the brightness of the lighting point, and when K<1, reduce the brightness of the lighting point by one level with ΔL as the gradient; S7: After the brightness adjustment of the lighting point is completed, return to step S3.

[0005] As a further solution of the present invention: in S1, the lighting point is composed of N LED bulbs, the brightness L of a single LED bulb is obtained, the number of circuits connected in series at the lighting point is d, and the calculation formula of ΔL is ΔL=N·L / d.

[0006] As a further solution of the present invention: in S2, the responsible area is the lighting area division method of each lighting point, specifically: obtaining the lighting range and road range under the initial brightness, and the responsible area is the overlapping area of ​​the lighting range and the road range.

[0007] As a further solution of the present invention: in said S4, the illumination brightness L of each grid is n Calculate the optimal number of pedestrians P for the current brightness of each grid max , where P max The calculation formula is: ; Among them, L min is to set the minimum brightness required for pedestrians, and k is the brightness value that will be reduced when setting a single pedestrian.

[0008] As a further solution of the present invention: in S5, the detection period T is set to the average time for pedestrians to pass through the responsible area in historical data.

[0009] As a further solution of the present invention: in said S5, a pedestrian number change curve F(x) in each grid area in the detection period T is obtained, and the average pedestrian number P is calculated by the pedestrian number change curve F(x). i , the calculation formula is as follows: ; Among them, t0 is the start time of the detection period, and t is the end time of the detection period.

[0010] As a further solution of the present invention: in S5, adjacent target grids are merged to form a new target grid, and the number of target grids represented by the new target grid does not change.

[0011] The present invention also provides an adaptive dimming system for a DC lighting system, comprising: A grid division module divides non-overlapping responsibility areas according to the positions of each lighting point, and divides the responsibility areas into grids, each grid area being a rectangle of the same size; The data acquisition module obtains the central point brightness Ln of each grid area in the state of no obstacle occlusion, takes the central point brightness as the average brightness of the grid area, obtains the pedestrian number change curve F(x) of each grid area in the detection period T, and obtains the number of target grids B and the number of grids to be detected H; The data analysis module calculates the average number of pedestrians Pi in each grid within the detection cycle and determines whether Pi ≥ Pmax is true. When Pi ≥ Pmax is true, the grid area corresponding to Pi is marked as the target grid. When Pi ≥ Pmax is not true, the grid area corresponding to Pi is marked as the qualified grid. All target grids are screened out, and adjacent target grids are merged into new target grids. The qualified grids near the target grid are marked as the grids to be detected, and the ratio K of the number of target grids to the number of grids to be detected is calculated. The lighting module increases the brightness of the lighting point with a gradient of ΔL when K>1, does not adjust the brightness of the lighting point when K=1, and decreases the brightness of the lighting point with a gradient of ΔL when K<1.

[0012] The beneficial effects of the present invention are as follows: according to the positions of each lighting point, the responsible area is divided into non-overlapping areas, the responsible area is divided into multiple grid areas, and the central point brightness L of each grid area in the state of no obstacle blocking is obtained. n , taking the brightness of the center point as the average brightness of the grid area, and setting the optimal number of pedestrians P max, the target grid and qualified grids are obtained according to the average number of pedestrians, the qualified grids near the target grid are marked as grids to be detected, the number of target grids B and the number of grids to be detected H are obtained, and the ratio K of the number of target grids to the number of grids to be detected is calculated. When K>1, the brightness of the lighting point is increased by one level with ΔL as the gradient. When K=1, the brightness of the lighting point is not adjusted. When K<1, the brightness of the lighting point is reduced by one level with ΔL as the gradient. This realizes that the brightness of the lighting can be changed according to the number of pedestrians, and the lighting brightness required by pedestrians is guaranteed to the greatest extent, making night travel safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a structural schematic diagram of an adaptive dimming method for a DC lighting system of the present invention. DETAILED DESCRIPTION

[0015] 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.

[0016] See also Figure 1 As shown, the present invention is an adaptive dimming method for a DC lighting system, comprising the following steps: The lighting system lamps are LED integrated structures, in which all lighting points are composed of multiple LED bulbs. Multiple LED bulbs are divided into multiple groups. The LED bulbs in each group are connected in series, and the groups are connected in parallel to form lighting point lamps. In order to ensure the uniform distribution of light, the initial opening of the LED bulbs adopts an interval strategy. Specifically, not all LED bulbs are turned on at the same time, but according to a certain pattern, such as turning on every one or two LED bulbs. In this way, a relatively uniform light distribution can be formed in the initial stage to avoid local overbrightness or darkness.

[0017] S1: Setting a standard brightness value L0 for each lighting point of the lighting system, and using the standard brightness value L0 as the initial brightness of each lighting point when the lighting system is turned on, and setting multiple brightness levels with a preset ΔL as a gradient; S2: dividing non-overlapping responsibility areas according to the positions of the lighting points, and dividing the responsibility areas into grids, where each grid area is a rectangle of the same size; S3: Get the central point brightness L of each grid area without any obstacles n, take the brightness of the center point as the average brightness of the grid area; S4: The average lighting brightness L of each grid area n Set the optimal number of pedestrians P max ; S5: Set the detection period T, obtain the pedestrian number change curve F(x) of each grid area in the detection period T, and calculate the average pedestrian number P of each grid in the detection period i , where P i represents the average number of pedestrians in the i-th grid area in the current detection cycle, and determines P i ≥P max Is it true, when P i ≥P max When established, it will be i The corresponding grid area is marked as the target grid. i ≥P max If it is not true, then it will be i The corresponding grid area is marked as a qualified grid, all target grids are screened out, and adjacent target grids are merged to form a new target grid; S6: When a target grid appears in the responsible area, mark the qualified grids near the target grid as grids to be detected, obtain the number of target grids B and the number of grids to be detected H, calculate the ratio K of the number of target grids to the number of grids to be detected, and when K>1, increase the brightness of the lighting point by one level with ΔL as the gradient, when K=1, do not adjust the brightness of the lighting point, and when K<1, reduce the brightness of the lighting point by one level with ΔL as the gradient; S7: After the brightness adjustment of the lighting point is completed, return to step S3.

[0018] It can be understood that the present invention relates to an adaptive dimming method for a DC lighting system, which aims to achieve intuitive distinction of brightness changes by dividing the lighting area into multiple non-overlapping responsibility areas and gridding the responsibility areas of each lighting point. The system uses the brightness of the center point of each grid as the average brightness index of the grid, thereby more accurately reflecting the overall lighting effect. In addition, the optimal number of pedestrians is divided according to different brightness values, and by real-time monitoring of the actual number of pedestrians in the grid, statistical analysis is performed on the grids that exceed the optimal number of pedestrians to evaluate whether brightness adjustment is required. This method effectively improves the accuracy and response efficiency of lighting management.

[0019] In a preferred embodiment of the present invention, in S1, the lighting point is composed of N LED bulbs, the brightness L of a single LED bulb is obtained, the number of circuits connected in series at the lighting point is d, and the calculation formula of ΔL is ΔL=N·L / d.

[0020] It can be understood that the contribution of each LED bulb to the overall lighting brightness can be quantified according to the formula, so as to better control and adjust the lighting effect. It provides flexibility for the design of lighting points, and can adjust the number of LED bulbs and circuit configuration as needed to meet the brightness requirements of different scenes.

[0021] In a preferred embodiment of the present invention, in S2, the responsible area is the lighting area division method of each lighting point, specifically: obtaining the lighting range and road range under the initial brightness, and the responsible area is the overlapping area of ​​the lighting range and the road range.

[0022] It is understandable that the division of lighting zones can effectively ensure that the lighting in the responsible area matches the actual roads in use, thereby improving safety and energy efficiency. It optimizes lighting resources, reduces unnecessary energy consumption, and ensures that pedestrians get enough brightness in the responsible area, reducing the risk of accidents. This can improve the overall environmental comfort and safety.

[0023] In a preferred embodiment of the present invention, in S4, the illumination brightness L of each grid is n Calculate the optimal number of pedestrians P for the current brightness of each grid max , where P max The calculation formula is: ; Among them, L min is to set the minimum brightness required for pedestrians, and k is the brightness value that will be reduced when setting a single pedestrian.

[0024] It is understandable that this method of calculation ensures that the brightness of each grid can meet the needs of a specific number of people and improves the lighting effect. By maintaining an appropriate brightness level, the safety hazards caused by insufficient light are reduced and pedestrian safety is guaranteed. According to the real-time pedestrian flow and brightness changes, a scientific basis is provided for timely brightness adjustment to improve resource utilization efficiency.

[0025] In a preferred embodiment of the present invention, in S5, the detection period T is set to the average time for pedestrians to pass through the responsible area in historical data.

[0026] It is understandable that by setting the detection cycle based on historical data, the system can monitor the flow changes of pedestrians in a timely manner and make corresponding adjustments quickly. The use of average time can effectively avoid false alarms caused by instantaneous pedestrian flow fluctuations and ensure system stability.

[0027] In a preferred embodiment of the present invention, in said S5, a pedestrian number change curve F(x) is obtained in each grid area in the detection period T, and the average pedestrian number P is calculated by the pedestrian number change curve F(x). i, the calculation formula is as follows: ; Among them, t0 is the start time of the detection period, and t is the end time of the detection period.

[0028] In a preferred embodiment of the present invention, in S5, adjacent target grids are merged to form a new target grid, and the number of target grids represented by the new target grid does not change.

[0029] The present invention also provides an adaptive dimming system for a DC lighting system, comprising: A grid division module divides non-overlapping responsibility areas according to the positions of each lighting point, and divides the responsibility areas into grids, each grid area being a rectangle of the same size; The data acquisition module obtains the central point brightness Ln of each grid area in the state of no obstacle occlusion, takes the central point brightness as the average brightness of the grid area, obtains the pedestrian number change curve F(x) of each grid area in the detection period T, and obtains the number of target grids B and the number of grids to be detected H; The data analysis module calculates the average number of pedestrians Pi in each grid within the detection cycle and determines P i ≥P max Is it true, when P i ≥P max When established, it will be i The corresponding grid area is marked as the target grid. i ≥P max If it is not true, then it will be i The corresponding grid area is marked as a qualified grid, all target grids are screened out, adjacent target grids are merged into a new target grid, qualified grids near the target grid are marked as grids to be detected, and the ratio K of the number of target grids to the number of grids to be detected is calculated; The lighting module increases the brightness of the lighting point with a gradient of ΔL when K>1, does not adjust the brightness of the lighting point when K=1, and decreases the brightness of the lighting point with a gradient of ΔL when K<1.

[0030] The above is a detailed introduction to the adaptive dimming method and system of the DC lighting system provided by the embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. An adaptive dimming method for a DC lighting system, characterized in that: The following steps are involved: S1: Setting a standard brightness value L0 for each lighting point of the lighting system, and using the standard brightness value L0 as the initial brightness of each lighting point when the lighting system is turned on, and setting multiple brightness levels with a preset ΔL as a gradient; S2: dividing non-overlapping responsibility areas according to the positions of the lighting points, and dividing the responsibility areas into grids, where each grid area is a rectangle of the same size; S3: Get the center point brightness L of each grid area without any obstacles n , take the brightness of the center point as the average brightness of the grid area; S4: The average lighting brightness L of each grid area n Set the optimal number of pedestrians P max ; S5: Set the detection period T, obtain the pedestrian number change curve F(x) of each grid area in the detection period T, and calculate the average pedestrian number P of each grid in the detection period i , where P i represents the average number of pedestrians in the i-th grid area in the current detection cycle, and determines P i ≥P max Is it true, when P i ≥P max When established, it will be i The corresponding grid area is marked as the target grid. i ≥P max If it is not true, then it will be i The corresponding grid area is marked as a qualified grid, all target grids are screened out, and adjacent target grids are merged to form a new target grid; S6: When a target grid appears in the responsible area, mark the qualified grids near the target grid as grids to be detected, obtain the number of target grids B and the number of grids to be detected H, calculate the ratio K of the number of target grids to the number of grids to be detected, and when K>1, increase the brightness of the lighting point by one level with ΔL as the gradient, when K=1, do not adjust the brightness of the lighting point, and when K<1, reduce the brightness of the lighting point by one level with ΔL as the gradient; S7: After the brightness adjustment of the lighting point is completed, return to step S3.

2. The adaptive dimming method of a DC lighting system according to claim 1, characterized in that: In S1, the lighting point is composed of N LED bulbs, the brightness L of a single LED bulb is obtained, the number of LED bulbs connected in series at the lighting point is d, and the calculation formula of ΔL is ΔL=N·L / d.

3. The adaptive dimming method of a DC lighting system according to claim 1, characterized in that: In S2, the responsible area is the lighting area division method of each lighting point, specifically: obtaining the lighting range and road range under the initial brightness, and setting the overlapping area of ​​the lighting range and the road range as the responsible area.

4. The adaptive dimming method of a DC lighting system according to claim 1, characterized in that: In S4, the illumination brightness L of each grid is n Calculate the optimal number of pedestrians P for the current brightness of each grid max , where P max The calculation formula is: ； Among them, L min is to set the minimum brightness required for pedestrians, and k is the brightness value that will be reduced when setting a single pedestrian.

5. The adaptive dimming method of a DC lighting system according to claim 1, characterized in that: In S5, the detection period T is set to the average time for pedestrians to pass through the responsible area in historical data.

6. The adaptive dimming method of a DC lighting system according to claim 1, characterized in that: In S5, a pedestrian number change curve F(x) of each grid area in the detection period T is obtained, and the average pedestrian number P is calculated based on the pedestrian number change curve F(x). i , the calculation formula is as follows: ； Among them, t0 is the start time of the detection period, and t is the end time of the detection period.

7. The adaptive dimming method of a DC lighting system according to claim 1, characterized in that: In S5, adjacent target grids are merged to form a new target grid, and the number of target grids represented by the new target grid does not change.

8. An adaptive dimming system for a DC lighting system, characterized in that: include: A grid division module divides non-overlapping responsibility areas according to the positions of each lighting point, and divides the responsibility areas into grids, each grid area being a rectangle of the same size; The data acquisition module obtains the central point brightness Ln of each grid area in the state of no obstacle occlusion, takes the central point brightness as the average brightness of the grid area, obtains the pedestrian number change curve F(x) of each grid area in the detection period T, and obtains the number of target grids B and the number of grids to be detected H; The data analysis module calculates the average number of pedestrians Pi in each grid within the detection cycle and determines P i ≥P max Is it true, when P i ≥P max When established, it will be i The corresponding grid area is marked as the target grid. i ≥P max If it is not true, then it will be i The corresponding grid area is marked as a qualified grid, all target grids are screened out, adjacent target grids are merged into a new target grid, qualified grids near the target grid are marked as grids to be detected, and the ratio K of the number of target grids to the number of grids to be detected is calculated; The lighting module increases the brightness of the lighting point with a gradient of ΔL when K>1, does not adjust the brightness of the lighting point when K=1, and decreases the brightness of the lighting point with a gradient of ΔL when K<1.

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