An Adaptive Dimming Method and System for a DC Lighting System

Abstract

The present invention relates to the field of lighting technology, and particularly relates to an adaptive dimming method and system for a DC lighting system. Non-overlapping responsibility areas are divided according to the positions of each lighting point, the responsibility areas are divided into multiple grid areas, and the center point brightness L of each grid area in the state of no obstacle occlusion is obtained. n The center point brightness is used as the average brightness of the grid area, and the optimal number of pedestrians P is set. max The target grid and the qualified grid are obtained by judging according to the average number of pedestrians. The qualified grids near the target grid are marked as grids to be detected. The number B of the target grids and the number H of the grids to be detected are obtained, and the ratio K of the number of the target grids to the number of the 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 decreased by one level with ΔL as the gradient.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting, and particularly to an adaptive dimming method and system for a DC lighting system. Background Art

[0002] The DC lighting system uses direct current as the power supply method. Compared with the traditional AC lighting system, it has better energy efficiency and stability. Most of the existing DC lighting fixtures are LED DC lighting fixtures. Among them, the adaptive dimming of the lighting system is an important technology. It detects environmental data and automatically adjusts the light source brightness, which not only optimizes the user experience but also significantly reduces energy consumption.

[0003] For common lighting systems, frequently changing 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 the overall brightness of the fixture is adjusted by lighting different numbers of LED bulbs. In the prior art, the adjustment of the fixture brightness mostly changes according to the ambient light intensity, but this method is not applicable when there are many pedestrians. Because pedestrians will produce shadows under the action of light, and the overlapping of shadows with each other may cause the clarity of the road surface to decrease and the vision clarity of pedestrians to be not high. 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:

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An adaptive dimming method for a DC lighting system includes the following steps:

[0007] S1: Set the standard brightness value L0 of each lighting point of the lighting system, and use the standard brightness value L0 as the initial brightness of each lighting point when the lighting system is turned on, and set multiple brightness levels with a preset ΔL as the gradient;

[0008] S2: Divide non-overlapping responsibility areas according to the positions of each lighting point, and perform grid division on the responsibility areas. Each grid area is a rectangle with the same size;

[0009] S3: Obtain the center point brightness L n of each grid area in the unobstructed state, and use the center point brightness as the average brightness of the grid area;

[0010] S4: Set the optimal number of pedestrians P n through the average illumination brightness L max of each grid area;

[0011] S5: Set the detection period T, obtain the change curve F(x) of the number of pedestrians in each grid area during the detection period T, and calculate the average number of pedestrians P in each grid during the detection period i , where P i represents the average number of pedestrians in the i-th grid area in the current detection period, and determine whether P i ≥ P max holds. When P i ≥ P max holds, mark the grid area corresponding to P i as the target grid. When P i ≥ P max does not hold, mark the grid area corresponding to P i as the qualified grid. Screen out all target grids, and merge adjacent target grids to form new target grids;

[0012] S6: When there are target grids in the responsible area, mark the qualified grids near the target grids as grids to be detected. Obtain the number B of target grids and the number H of grids to be detected, and calculate the ratio K of the number of target grids to the number of grids to be detected. 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. When K < 1, decrease the brightness of the lighting point by one level with ΔL as the gradient;

[0013] S7: After the brightness adjustment of the lighting point is completed, return to step S3.

[0014] As a further solution of the present invention: In the S1, the lighting point is composed of N LED bulbs. Obtain the brightness L of a single LED bulb and the number d of circuits in which the lighting points are connected in series. The calculation formula of ΔL is ΔL = N·L / d.

[0015] As a further solution of the present invention: In the S2, the method for dividing the responsible area of each lighting point is specifically as follows: Obtain 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.

[0016] As a further solution of the present invention: In the S4, calculate the current brightness optimal number of pedestrians P n of each grid through the lighting brightness L max of each grid, where the calculation formula of P max is:

[0017] ;

[0018] where, L min is the set minimum brightness required by pedestrians, and k is the set brightness value weakened by a single pedestrian.

[0019] As a further solution of the present invention: in the step S5, the detection period T is set as the average time for pedestrians to pass through the responsible area in historical data.

[0020] As a further solution of the present invention: in the step S5, obtain the curve F(x) of the change in the number of pedestrians in each grid area during the detection period T, and calculate the average number of pedestrians P through the curve F(x) of the change in the number of pedestrians i , and the calculation formula is as follows:

[0021] ;

[0022] wherein, t0 is the start time of the detection period, and t is the end time of the detection period.

[0023] As a further solution of the present invention: in the step S5, adjacent target grids are merged, and the number of target grids represented by the newly formed target grids remains unchanged.

[0024] The present invention also provides an adaptive dimming system for a DC lighting system, including:

[0025] A grid division module, which divides non-overlapping responsible areas according to the positions of each lighting point, and performs grid division on the responsible areas, and each grid area is a rectangle with the same size;

[0026] A data acquisition module, which obtains the center point brightness Ln of each grid area in the state without obstacle occlusion, takes the center point brightness as the average brightness of the grid area, obtains the curve F(x) of the change in the number of pedestrians in each grid area during the detection period T, and obtains the number B of target grids and the number H of grids to be detected;

[0027] A data analysis module, which calculates the average number of pedestrians Pi in each grid during the detection period, determines whether Pi≥Pmax holds, when Pi≥Pmax holds, marks the grid area corresponding to Pi as a target grid, when Pi≥Pmax does not hold, marks the grid area corresponding to Pi as a qualified grid, screens out all target grids, merges adjacent target grids into new target grids, marks the qualified grids near the target grids as grids to be detected, and calculates the ratio K of the number of target grids to the number of grids to be detected;

[0028] A lighting module, when K>1, increases the brightness of the lighting point with ΔL as the gradient, when K = 1, does not adjust the brightness of the lighting point, and when K<1, decreases the brightness of the lighting point with ΔL as the gradient.

[0029] Advantages of the present invention: Non-overlapping responsibility areas are divided according to the positions of each lighting point. The responsibility areas are divided into multiple grid areas, and the central point brightness L of each grid area in the state without obstacle occlusion is obtained. n The central point brightness is used as the average brightness of the grid area, and the optimal number of pedestrians P is set. max Based on the average number of pedestrians, the target grid and qualified grids are determined. The qualified grids near the target grid are marked as grids to be detected. The number B of target grids and the number H of grids to be detected 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 remains unchanged; when K < 1, the brightness of the lighting point is decreased by one level with ΔL as the gradient. This realizes the ability to change the lighting brightness according to the number of pedestrians, maximally ensuring the lighting brightness required by pedestrians and making night travel safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] Figure 1 FIG. is a schematic structural diagram of an adaptive dimming method for a DC lighting system according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figure 1 As shown, the present invention is an adaptive dimming method for a DC lighting system, including the following steps:

[0034] The lighting system lamps are of an LED integrated integrated structure, where all lighting points are composed of multiple LED bulbs. The multiple LED bulbs are divided into multiple groups, and the LED bulbs in each group are connected in series, and the groups are connected in parallel to form the lighting point lamps. To ensure uniform light distribution, the initial turn-on of the LED bulbs adopts an interval strategy. Specifically, not all LED bulbs are turned on simultaneously, but they are turned on according to a certain rule, such as every other one or two LED bulbs. This can form a relatively uniform light distribution in the initial stage and avoid local over-brightness or over-darkness.

[0035] S1: Set the standard brightness value L0 for each lighting point of the lighting system. When the lighting system is turned on, use the standard brightness value L0 as the initial brightness of each lighting point, and set multiple brightness levels with a preset ΔL as the gradient.

[0036] S2: Divide non - overlapping responsible areas according to the positions of each lighting point, and perform grid division on the said responsible areas. Each grid area is a rectangle of the same size.

[0037] S3: Obtain the center point brightness L of each grid area in the state without obstacle occlusion. n Take the center point brightness as the average brightness of the grid area.

[0038] S4: Set the optimal number of pedestrians P through the average illumination brightness L of each grid area. n max ;

[0039] S5: Set the detection period T, obtain the change curve F(x) of the number of pedestrians in each grid area during the detection period T, and calculate the average number of pedestrians Pi in each grid during the detection period. i Among them, Pi i represents the average number of pedestrians in the i - th grid area in the current detection period. Determine whether Pi i ≥P max holds. When Pi i ≥P max holds, mark the grid area corresponding to Pi i as the target grid. When Pi i ≥P max does not hold, mark the grid area corresponding to Pi i as the qualified grid. Screen out all target grids, and merge adjacent target grids to form a new target grid.

[0040] S6: When a target grid appears in the responsible area, mark the qualified grids near the target grid as the grids to be detected. Obtain the number B of target grids and the number H of grids to be detected, calculate the ratio K of the number of target grids to the number of grids to be detected. 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. When K < 1, decrease the brightness of the lighting point by one level with ΔL as the gradient.

[0041] S7: After the brightness adjustment of the lighting point is completed, return to step S3.

[0042] ​It can be understood that the present invention relates to an adaptive dimming method for a DC lighting system, aiming to achieve an intuitive distinction of brightness changes by dividing the lighting area into multiple non-overlapping responsibility areas and performing grid division on 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, thus 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 the actual number of pedestrians in the grid, statistical analysis is carried out on the grids exceeding the optimal number of pedestrians to evaluate whether brightness adjustment is needed. This method effectively improves the accuracy and response efficiency of lighting management.

[0043] In a preferred embodiment of the present invention, in the S1, the lighting point is composed of N LED bulbs, the brightness L of a single LED bulb is obtained, and the number d of circuits in which the lighting points are connected in series. The calculation formula of ΔL is ΔL = N·L / d.

[0044] It can be understood that each LED bulb's contribution to the overall lighting brightness is quantified according to this 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 configurations according to needs to meet the brightness requirements of different scenarios.

[0045] In a preferred embodiment of the present invention, in the S2, the method for dividing the lighting area of each lighting point into the responsibility area is specifically as follows: the lighting range and the road range under the initial brightness are obtained, and the responsibility area is the overlapping area of the lighting range and the road range.

[0046] It can be understood that the lighting area division can effectively ensure that the lighting in the responsibility area matches the actual road used, thus improving safety and energy efficiency. Optimize lighting resources, reduce unnecessary energy consumption, and at the same time ensure that pedestrians obtain sufficient brightness in the responsibility area, reducing the risk of accidents. This can improve the overall environmental comfort and safety.

[0047] In a preferred embodiment of the present invention, in the S4, through the lighting brightness L of each grid n calculate the current brightness optimal number of pedestrians P of each grid max , where P max The calculation formula of is:

[0048] ;

[0049] where, L min is the minimum brightness required for the set pedestrians, and k is the brightness value weakened by a single pedestrian.

[0050] It can be understood that by calculating in this way, it is ensured that the brightness of each grid can meet the needs of a specific number of people, improving the lighting effect. By maintaining an appropriate brightness level, the safety hazards caused by insufficient light are reduced, ensuring the safety of pedestrians. According to the real-time pedestrian flow and brightness changes, scientific basis is provided for timely brightness adjustment, improving the resource utilization efficiency.

[0051] In a preferred embodiment of the present invention, in the step S5, the detection period T is set as the average time for pedestrians to pass through the responsible area in historical data.

[0052] It can be understood that by setting the detection period based on historical data, it is ensured that the system can timely monitor the changes in pedestrian flow, so as to quickly make corresponding adjustments. Using the average time can effectively avoid false alarms caused by instantaneous fluctuations in pedestrian flow, ensuring the stability of the system.

[0053] In a preferred embodiment of the present invention, in the step S5, the change curve F(x) of the number of pedestrians in each grid area during the detection period T is obtained, and the average number of pedestrians P is calculated through the change curve F(x) of the number of pedestrians. i , and the calculation formula is as follows:

[0054] ;

[0055] where, t0 is the start time of the detection period, and t is the end time of the detection period.

[0056] In a preferred embodiment of the present invention, in the step S5, adjacent target grids are merged, and the number of target grids represented by the newly formed target grid remains unchanged.

[0057] The present invention also provides an adaptive dimming system for a DC lighting system, including:

[0058] A grid division module, which divides non-overlapping responsible areas according to the positions of each lighting point, and performs grid division on the responsible areas, and each grid area is a rectangle with the same size;

[0059] A data acquisition module, which acquires the center point brightness Ln of each grid area in the state without obstacle occlusion, takes the center point brightness as the average brightness of the grid area, acquires the change curve F(x) of the number of pedestrians in each grid area during the detection period T, acquires the number B of target grids and the number H of grids to be detected;

[0060] A data analysis module, which calculates the average number of pedestrians Pi in each grid during the detection period, and judges whether P i ≥P max holds. When P i ≥P max holds, then the one related to Pi The corresponding grid area is marked as the target grid. When P i ≥P max is not established, the grid area corresponding to P i is marked as a qualified grid. All target grids are screened out, adjacent target grids are merged into a new target grid, the 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;

[0061] For the lighting module, when K > 1, the brightness of the lighting point is increased 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 decreased with ΔL as the gradient.

[0062] The above has introduced in detail the adaptive dimming method and system of the DC lighting system provided by the embodiments of the present application. Specific examples are used herein to elaborate on the principle and implementation manner 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 manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An adaptive dimming method for a DC lighting system, characterized in that, It includes the following steps: S1: Set the standard brightness value L0 for each lighting point of the lighting system. When the lighting system is turned on, use the standard brightness value L0 as the initial brightness of each lighting point, and set multiple brightness levels with a preset ΔL as the gradient. S2: Divide non-overlapping responsibility areas according to the positions of each lighting point, and perform grid division on the responsibility areas. Each grid area is a rectangle of the same size. S3: Obtain the center point brightness L of each grid area in the state without obstacle occlusion, and use the center point brightness as the average brightness of the grid area; n ​ S4: Set the optimal number of pedestrians P through the average illumination brightness L of each grid area n Set the optimal number of pedestrians P max ; S5: Set the detection period T, obtain the change curve F(x) of the number of pedestrians in each grid area during the detection period T, and calculate the average number of pedestrians P in each grid during the detection period i , where P i represents the average number of pedestrians in the i-th grid area in the current detection period. Determine whether P i ≥ P max holds. When P i ≥ P max holds, mark the grid area corresponding to P i as the target grid. When P i ≥ P max does not hold, mark the grid area corresponding to P i as the qualified grid. Screen out all target grids, merge adjacent target grids to form new target grids; S6: When a target grid appears in the responsibility area, mark the qualified grids near the target grid as grids to be detected. Obtain the number B of target grids and the number H of grids to be detected, and calculate the ratio K of the number of target grids to the number of grids to be detected. 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. When K < 1, decrease 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. Obtain the brightness L of a single LED bulb and the number d of LED bulbs connected in series in the lighting point. The calculation formula for ΔL is ΔL = N·L / d.

3. An adaptive dimming method for a DC lighting system according to claim 1, characterized in that In S2, the method for dividing the lighting area of each lighting point into the responsibility area is as follows: Obtain the lighting range and road range under the initial brightness, and set the overlapping area of the lighting range and the road range as the responsibility area.

4. The adaptive dimming method of a DC lighting system according to claim 1, characterized in that, In step S4, based on the illumination brightness L of each grid n calculate the current optimal number of pedestrians P for each grid max , where P max is calculated by the following formula: ； Among them, L min is the set minimum brightness required by pedestrians, and k is the set brightness value weakened by 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 responsibility area in historical data.

6. The adaptive dimming method of a DC lighting system according to claim 1, characterized in that In step S5, the change curve F(x) of the number of pedestrians in each grid area during the detection period T is obtained, and the average number of pedestrians P is calculated based on the change curve F(x) of the number of pedestrians. i The calculation formula is as follows: ； Wherein, 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, wherein In S5, when adjacent target grids are merged to form a new target grid, the number of target grids represented by the new target grid remains unchanged.

8. An adaptive dimming system for a DC lighting system, characterized in that, It includes: A grid division module that divides non-overlapping responsibility areas according to the positions of each lighting point and performs grid division on the responsibility areas. Each grid area is a rectangle of the same size. Data acquisition module, acquiring the center point brightness L of each grid area without obstacle occlusion n , taking the center point brightness as the average brightness of the grid area, and passing the average illumination brightness L of each grid area n Setting the optimal number of pedestrians P max , acquiring the change curve F(x) of the number of pedestrians in each grid area during the detection period T, and acquiring the number B of target grids and the number H of grids to be detected; The data analysis module calculates the average number of pedestrians Pi in each grid during the detection period and determines whether P i ≥P max holds. When P i ≥P max holds, the grid area corresponding to P i is marked as the target grid. When P i ≥P max does not hold, the grid area corresponding to P i 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 grids 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; A lighting module that increases the brightness of the lighting point with ΔL as the gradient when K > 1, does not adjust the brightness of the lighting point when K = 1, and decreases the brightness of the lighting point with ΔL as the gradient when K < 1.

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