Adaptive constant-illumination adaptive light efficiency street lamp and control method thereof

Abstract

The application discloses a kind of self-adapting constant-illumination adaptive light efficiency street lamps and its control method, belong to intelligent lighting field.The cavity of the lamp of the application adopts layered modular layout, and the illumination sensing module is top-mounted and upward lighting, which can effectively avoid the interference of its own light and road surface reflected light.The LED lighting module is configured with asymmetric differentiated curvature reflector cup, which can realize bidirectional distribution of light, light spot staggered lap joint, eliminate road surface illumination trough and improve lighting uniformity.The application is internally provided with step self-calibration and gear hysteresis smooth dimming algorithm, which dynamically calibrates self-light interference coefficient through small power step disturbance that cannot be perceived by human eye, and decouples to obtain real environment illumination.Coordinated with step-by-step gear switching and high-frequency slow change dimming mode, it effectively solves the problems of traditional street light photometry distortion, dimming oscillation and severe stroboscopic.The application can adapt to day and night light and various road surface reflection conditions, realize stable and non-stroboscopic, high-uniformity and constant-illumination intelligent lighting, has reliable structure, good energy-saving performance and wide application range.

Description

Technical Field

[0001] This invention relates to the field of intelligent street light dimming control technology, and in particular to an adaptive constant illuminance adaptive luminous efficacy street light and its control method. Background Technology

[0002] LED streetlights, also known as semiconductor lighting, use light-emitting diodes (LEDs) as their light source. As a solid-state cold light source, LED streetlights are characterized by being environmentally friendly and pollution-free, consuming little power, having high luminous efficiency, and having a long lifespan.

[0003] Current constant illuminance smart streetlights generally use ambient illuminance sensors to collect external brightness signals, which are then used in conjunction with a controller to achieve automatic dimming. However, in actual use, illuminance sensors are highly susceptible to interference from their own light emission and stray light reflected from the road surface, resulting in the collected illuminance data not reflecting the true natural ambient light, thus causing serious data distortion.

[0004] Data distortion directly leads to a series of defects: streetlights exhibit frequent brightness adjustments, self-oscillations in brightness, and visible flickering, which not only affects the visual comfort of drivers but also repeatedly impacts the drive circuit, reducing the lifespan of the lamps. Furthermore, traditional streetlights often use single-curved reflectors, resulting in poor uniformity of road surface illumination and illuminance dips where the area under the light is bright while areas between lights are dark, making it impossible to maintain good road surface light distribution at different dimming levels.

[0005] Therefore, there is an urgent need for an adaptive constant illuminance street light that can autonomously calibrate self-light interference, flicker-free dimming, adapt to multiple working conditions, and have highly uniform light distribution, in order to solve many of the shortcomings of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to provide an adaptive constant illuminance adaptive luminous efficacy street light, which completely solves the problems of dimming flicker, data distortion, uneven road surface illuminance, and poor working condition adaptability of traditional street lights by using a step self-calibration algorithm, hierarchical hysteresis backlighting logic, and asymmetric reflector light distribution structure.

[0007] To achieve the above objectives, the present invention provides an adaptive constant illuminance street light, comprising a lampshade and LED beads, and further comprising a main control unit, an ambient illuminance sensing module, an LED constant current driving module, and an LED lighting module, all arranged in the inner cavity of the lampshade. The main control unit, the LED constant current driving module, and the LED lighting module are arranged in a layered manner. Specifically, a plurality of LED lighting modules are arranged in a rectangular array at the bottom of the inner cavity of the lampshade, and LED constant current driving modules are arranged at fixed intervals above the LED lighting modules. The main control unit is arranged centrally above the LED constant current driving modules. The ambient illuminance sensing module is embedded in the top of the lampshade, away from the light-emitting area of ​​the LED lighting modules, and is used to collect external natural light.

[0008] Preferably, the main control unit has a built-in step self-calibration algorithm and segmented gear adjustment logic. It periodically outputs a small power step disturbance with an amplitude below the human visual perception threshold to the LED constant current drive module, collects the total illuminance difference before and after the disturbance, and calculates the light reflection interference coefficient of the lamp itself. The light reflection interference coefficient is used to cancel the collection interference caused by the lamp's self-luminescence, and the true ambient natural illuminance is obtained through decoupling. The main control unit presets discrete power levels, executes sequential switching between adjacent levels, and uses a slope-smooth, gradually changing output method to control the LED constant current drive module during the level switching process.

[0009] Preferably, the main control unit is further divided into multiple discrete fixed levels according to the output power of the lamp, and an illuminance hysteresis threshold range is set between the levels.

[0010] Preferably, the LED constant current drive module adopts high-frequency PWM dimming or analog constant current dimming, wherein the dimming frequency of high-frequency PWM dimming is set to be greater than 20kHz.

[0011] Preferably, the bottom of the LED lighting module is closely attached to the inner side of the light-transmitting panel, including a module heat-conducting base plate, and the module heat-conducting base plate fixes several light-emitting modules with asymmetrical reflectors; The curvature of the reflective surface of the reflector cup of the light-emitting module closer to the lamp arm is less than the curvature of the reflective surface farther from the lamp arm.

[0012] Preferably, the ambient light sensing module includes a high-precision photosensitive sensor, a fixed base, and a sealed housing. The photosensitive sensor and the fixed base are both arranged inside the sealed housing for waterproofing and dustproofing. The photosensitive sensor is fixed on the fixed base with its detection end facing upwards.

[0013] The above-mentioned control method for adaptive constant illuminance adaptive luminous efficacy streetlights includes the following steps: S1. System initialization and self-test: After the system is powered on, the main control unit completes the communication self-test with the LED constant current drive module and the ambient illuminance sensor module, confirms that each module is working normally and enters the standby detection state. The ambient illuminance module installed on the top of the lampshade continuously collects ambient illuminance data and uploads it to the main control unit. S2, Periodic Step Calibration: The main control unit executes a step self-calibration program according to a preset period under the steady-state lighting condition of the lamp, outputs a small power step disturbance LED constant current drive module, collects illuminance data, eliminates constant natural environmental illuminance variables through difference calculation, and accurately calculates the light reflection interference coefficient of the lamp itself under the current road conditions. S3, Illuminance Decoupling Processing: The main control unit uses the self-light interference coefficient calculated in real time to compensate and correct the original total illuminance data collected by the ambient illuminance sensing module, thereby offsetting the collection interference caused by the self-emission of lamps and road surface reflection light, and decoupling and separating the pure real ambient natural illuminance. S4. Threshold determination and graded adjustment: The main control unit compares the decoupled real natural illuminance with the preset grade threshold to determine the threshold, and then switches between adjacent grades step by step, prohibiting cross-grade jump adjustment; S5. Smooth and Gradual Output: After determining the target lighting level, the main control unit controls the LED constant current drive module to complete the power adjustment by using a smooth and gradual output method with a slope. The drive module uses a high-frequency PWM dimming mode greater than 20kHz or an analog constant current dimming mode to gradually transition to the target lighting level power with a linear slope. S6. Dynamic Adaptive Monitoring: The system continuously executes steps S2-S5 in a loop, periodically updating the self-light interference coefficient and lighting level, and dynamically adapting to day-night cycles, weather changes, and road condition changes.

[0014] Therefore, the present invention employs the above-mentioned adaptive constant illuminance adaptive luminous efficacy street light and its control method, which has the following technical effects: (1) The present invention adopts a top-isolated illuminance acquisition structure and a layered hardware layout to significantly reduce the self-light interference of lamps from the hardware end. Combined with the step self-calibration algorithm, the self-light interference coefficient under different road conditions can be dynamically calibrated, accurately decoupled from the real environment illuminance, and completely solve the industry pain points of traditional street lamp illuminance acquisition distortion, dimming oscillation and flicker.

[0015] (2) The present invention adopts the control logic of discrete gear hysteresis control + smooth and gradual output, which avoids frequent dimming caused by small fluctuations in light and eliminates visual discomfort caused by hard brightness jump. Combined with high frequency dimming technology above 20kHz, it realizes flicker-free lighting throughout the process and greatly improves lighting stability.

[0016] (3) The present invention innovatively adopts an asymmetric differentiated curvature reflector cup structure. Through the staggered arrangement of front and rear modules and the overlapping compensation of light spots, the uniformity of road illumination can be significantly improved without increasing the power of the lamps. It is suitable for all dimming conditions and takes into account both energy saving and lighting effect.

[0017] (4) The hardware partition layout of the present invention is reasonable, the equipment has a low failure rate and a long service life. It also has the ability to adapt to working conditions and can be adapted to complex road environments such as sunny days, rainy days, and snowy days. It is suitable for use in multiple scenarios such as municipal main roads, rural roads, and park roads, and has strong practicality and adaptability.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an adaptive constant illuminance adaptive luminous efficiency street light according to the present invention; Figure 2 This is a front view of an LED lighting module for an adaptive constant illuminance street light according to the present invention; Figure 3 This is a schematic diagram of an asymmetric reflector for an adaptive constant illuminance street light according to the present invention, wherein R1 is the curvature of the near lamp arm side and R2 is the curvature of the far lamp arm side. Figure 4 This is a flowchart of a control method for an adaptive constant illuminance street light according to the present invention; Figure 5 This is a connection diagram of the main control unit of an LED lighting module for an adaptive constant illuminance street light according to the present invention.

[0020] Figure Labels 1. Lampshade; 2. Main control unit; 3. LED constant current drive module; 4. LED lighting module; 5. Ambient illuminance sensor module; 6. LED beads; 7. Reflector. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Example 1 like Figures 1 to 5 As shown, this embodiment discloses an adaptive constant illuminance adaptive luminous efficacy street light. The overall structure adopts a rectangular lampshade, with no irregular shape, which facilitates mass production assembly and subsequent operation and maintenance. The inner cavity of the lampshade 1 adopts a three-layer layout. The bottom layer is the LED lighting module 4, the middle layer is the LED constant current drive module 3, and the top layer is the main control unit 2, avoiding high temperature superposition and electromagnetic interference.

[0024] The ambient illuminance sensor module 5 is independently embedded at the top of the lamp cover 1, with the sensor detection end facing vertically upwards, completely isolated from the lighting light path below. This hardware structure minimizes direct light from the light source and stray light reflected from the road surface, ensuring the basic accuracy of the acquired signal. The ambient illuminance sensor module 5 is encased in a sealed shell, suitable for outdoor waterproof, dustproof, and aging conditions, meeting the long-term operation requirements of road lighting. A mounting base is installed inside the sealed shell, and a photosensitive sensor is fixed to the upper surface of the mounting base.

[0025] The bottom of the LED lighting module 4 is closely attached to the inner side of the light-transmitting panel, including a module heat-conducting base plate. Multiple independent light-emitting modules are mounted on the heat-conducting base plate. Each module is equipped with an asymmetric parabolic reflector cup 7. The reflector surface closer to the lamp arm has a smaller curvature, achieving close-range focused lighting and eliminating dark areas under the lamp; the reflector surface further away from the lamp arm has a larger curvature, achieving long-distance light spot extension and overlapping the lighting area of ​​adjacent streetlights. The bottom of the reflector cup 7 has mounting holes into which LED beads 6 are embedded. The multiple modules are arranged in a staggered pattern, with mutual light spot compensation, which can improve the road surface illuminance uniformity to above 0.65, meeting the national standard for main road lighting without increasing the light source power.

[0026] Main control unit 2 is the core control hub of the system, with a built-in exclusive step self-calibration algorithm and multi-level dimming logic. The system automatically triggers a small power step calibration at fixed intervals, with the disturbance amplitude controlled within the range imperceptible to the human eye. It accurately calculates the real-time self-light interference coefficient by the difference in illuminance before and after, and can dynamically adapt to different reflection scenarios such as dry road surface, rainy road surface, and snowy road surface in winter, solving the shortcomings of traditional static calibration that cannot adapt to changes in working conditions.

[0027] During dimming control, the main control unit 2 decouples and corrects the original illuminance data using an interference coefficient, eliminating self-light interference components and obtaining the true ambient natural light brightness. Simultaneously, the system sets multiple discrete fixed power levels, with hysteresis threshold ranges between adjacent levels, effectively avoiding frequent level jumps caused by critical light fluctuations such as dawn / dusk alternation and cloud cover, thus resolving the dimming self-oscillation problem.

[0028] The gear shifting adopts a step-based judgment and smooth output control logic, while the power output uses a linear slope gradual change method to precisely control the transition time and eliminate instantaneous power jumps. At the same time, the LED constant current drive module 3 uses high-frequency PWM dimming above 20kHz or simulated constant current dimming to eliminate low-frequency flicker at the drive level and achieve smooth brightness adjustment that is imperceptible to the human eye.

[0029] The main control unit 2 has built-in fault fallback logic. When the illuminance sensor malfunctions or the signal is lost, the system automatically switches to the preset timing dimming mode to ensure that the normal lighting function of the street light is not lost, thereby improving the stability and reliability of the equipment operation.

[0030] The main control unit 2 is communicatively connected to the ambient illuminance sensing module 5, and the main control unit 2 is electrically connected to the LED constant current drive module 3. The LED constant current drive module 3 is electrically connected to the LED lighting module 4.

[0031] Working principle: I. Pre-operation preparation stage After the device is powered on and completes initialization and self-test, the main control unit 2, LED constant current drive module 3, ambient illuminance sensor module 5, and LED lighting module 4 establish normal communication. Utilizing the layered layout structure within the lampshade 1, electromagnetic interference and high-temperature effects are avoided. Simultaneously, the top-mounted ambient illuminance sensor module 5 completes light-gathering calibration, using an upward-facing detection structure to isolate the lamp's light emission from stray light reflected from the road surface, ensuring reliable natural light acquisition. The asymmetrical reflectors 7 of the LED lighting module 4 complete optical path alignment, and the system enters standby monitoring mode.

[0032] II. Runtime Adaptive Control Phase After the streetlights are turned on and running normally, the system continuously cycles through the entire process of calibration, decoupling, dimming, and light distribution. First, the ambient illuminance sensor module 5 collects the total ambient illuminance data in real time and uploads it to the main control unit 2; the main control unit 2 periodically outputs tiny power step disturbances imperceptible to the human eye, calculates the dynamic self-luminous interference coefficient by the difference in illuminance before and after the disturbance, removes the self-luminous interference of the lamps, and decouples to obtain the true natural ambient illuminance.

[0033] Subsequently, the main control unit 2 determines the power level based on the actual ambient illuminance, combined with preset multiple discrete power levels and hysteresis thresholds, and only performs sequential switching between adjacent power levels to avoid dimming oscillations caused by minor fluctuations in light. During the power level switching process, the LED constant current drive module 3 smoothly and gradually changes the output power through a fixed slope, combined with a high-frequency dimming mode above 20kHz, to achieve frequency-free brightness adjustment throughout the process.

[0034] During the lighting operation, multiple light-emitting modules with asymmetric reflectors 7 emit light in an alternating manner. By relying on the differential curvature surfaces on both sides, they complete the supplementary lighting under the lamp and the overlap of light spots between lamps, eliminating the illuminance valleys on the road surface. They maintain high uniformity of road lighting at different dimming levels, adapting to day and night alternation, weather changes and different road surface reflection conditions, and achieving constant illuminance intelligent adaptive lighting.

[0035] This invention also discloses a control method for an adaptive constant illuminance adaptive luminous efficacy street light, comprising the following steps: S1. System initialization and self-test: After the system is powered on, the main control unit 2 completes the communication self-test with the LED constant current drive module 3 and the ambient illuminance sensor module 5, confirms that each module is working normally and enters the standby detection state. The ambient illuminance sensor module 5 installed on the top of the lampshade 1 continuously collects ambient illuminance data and uploads it to the main control unit. S2, Periodic Step Calibration: The main control unit 2 executes a step self-calibration program according to a preset period under the steady-state lighting state of the lamp, outputs a small power step disturbance LED constant current drive module, collects illuminance data, eliminates constant natural environmental illuminance variables through difference calculation, and accurately calculates the light reflection interference coefficient of the lamp itself under the current road conditions. The interference coefficient can be dynamically updated according to different reflection conditions such as dry road surface, water accumulation, and snow accumulation, to achieve adaptive calibration and adapt to complex road environments. S3, Illuminance Decoupling Processing: The main control unit 2 uses the self-light interference coefficient calculated in real time to compensate and correct the original total illuminance data collected by the ambient illuminance sensing module 5, thereby offsetting the collection interference caused by the self-emission of lamps and road surface reflection light, and decoupling and separating the pure real ambient natural illuminance. S4. Threshold Determination and Tiered Control: The main control unit 2 has multiple preset discrete fixed lighting power levels, and a dedicated illuminance hysteresis threshold range is set between adjacent levels. The main control unit 2 compares and determines the decoupled real natural illuminance with the preset level threshold: only adjacent levels are allowed to switch step by step, and cross-level jump adjustment is prohibited; the hysteresis threshold is used to shield the small fluctuations in ambient illuminance, avoid frequent level switching of lamps, and eliminate dimming oscillation problems. S5. Smooth and Gradual Output: After determining the target lighting level, the main control unit 2 controls the LED constant current drive module 3 to complete the power adjustment by using a smooth and gradual output method with a slope. The drive module uses a high-frequency PWM dimming mode greater than 20kHz or an analog constant current dimming mode to gradually transition to the target lighting level power with a linear slope. S6. Dynamic Adaptive Monitoring: The system continuously executes steps S2-S5 in a loop, periodically updating the self-light interference coefficient and lighting level, and dynamically adapting to day-night cycles, weather changes, and road condition changes.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An adaptive constant illuminance adaptive luminous efficacy street light, comprising a lampshade and LED beads, characterized in that: It also includes a main control unit, an ambient illuminance sensing module, an LED constant current driving module, and an LED lighting module, all arranged inside the lampshade cavity. The main control unit, the LED constant current driving module, and the LED lighting module are distributed in layers. Among them, several LED lighting modules are arranged in a rectangular array at the bottom of the lampshade cavity, and LED constant current driving modules are arranged at fixed intervals above the LED lighting modules. The main control unit is arranged in the center above the LED constant current driving modules. The ambient illuminance sensing module is embedded in the top of the lampshade, away from the light-emitting area of ​​the LED lighting modules, and is used to collect external natural light.

2. The adaptive constant illuminance adaptive luminous efficacy street light according to claim 1, characterized in that: The main control unit has a built-in step self-calibration algorithm and segmented gear adjustment logic. It periodically outputs a small power step disturbance with an amplitude below the human visual perception threshold to the LED constant current drive module, collects the total illuminance difference before and after the disturbance, and calculates the light reflection interference coefficient of the lamp itself. The light reflection interference coefficient is used to cancel the collection interference caused by the lamp's self-luminescence, and the true ambient natural illuminance is obtained by decoupling. The main control unit presets discrete power levels, executes sequential switching between adjacent levels, and uses a slope-smooth, gradually changing output method to control the LED constant current drive module during the level switching process.

3. The adaptive constant illuminance adaptive luminous efficacy street light according to claim 2, characterized in that: The main control unit is also divided into multiple discrete fixed levels according to the output power of the lamp, and illuminance hysteresis threshold ranges are set between the levels.

4. The adaptive constant illuminance adaptive luminous efficacy street light according to claim 3, characterized in that: The LED constant current drive module adopts high-frequency PWM dimming or analog constant current dimming, wherein the dimming frequency of high-frequency PWM dimming is set to be greater than 20kHz.

5. The adaptive constant illuminance adaptive luminous efficacy street light according to claim 4, characterized in that: The bottom of the LED lighting module is closely attached to the inner side of the light-transmitting panel, including a module heat-conducting base plate, and the module heat-conducting base plate fixes several light-emitting modules with asymmetrical reflectors. The curvature of the reflective surface of the reflector cup of the light-emitting module closer to the lamp arm is less than the curvature of the reflective surface farther from the lamp arm.

6. The adaptive constant illuminance adaptive luminous efficacy street light according to claim 5, characterized in that: The ambient light sensing module includes a high-precision photosensitive sensor, a fixed base, and a sealed housing. The photosensitive sensor and the fixed base are both arranged inside the sealed housing for waterproofing and dustproofing. The photosensitive sensor is fixed on the fixed base with its detection end facing upwards.

7. An adaptive constant illuminance adaptive luminous efficacy street light control method, based on the adaptive constant illuminance adaptive luminous efficacy street light according to claim 6, characterized in that, Includes the following steps: S1. System initialization and self-test: After the system is powered on, the main control unit completes the communication self-test with the LED constant current drive module and the ambient illuminance sensor module, confirms that each module is working normally and enters the standby detection state. The ambient illuminance module installed on the top of the lampshade continuously collects ambient illuminance data and uploads it to the main control unit. S2, Periodic Step Calibration: The main control unit executes a step self-calibration program according to a preset period under the steady-state lighting condition of the lamp, outputs a small power step disturbance LED constant current drive module, collects illuminance data, eliminates constant natural environmental illuminance variables through difference calculation, and accurately calculates the light reflection interference coefficient of the lamp itself under the current road conditions. S3, Illuminance Decoupling Processing: The main control unit uses the self-light interference coefficient calculated in real time to compensate and correct the original total illuminance data collected by the ambient illuminance sensing module, thereby offsetting the collection interference caused by the self-emission of lamps and road surface reflection light, and decoupling and separating the pure real ambient natural illuminance. S4. Threshold determination and graded adjustment: The main control unit compares the decoupled real natural illuminance with the preset grade threshold to determine the threshold, and then switches between adjacent grades step by step, prohibiting cross-grade jump adjustment; S5. Smooth and Gradual Output: After determining the target lighting level, the main control unit controls the LED constant current drive module to complete the power adjustment by using a smooth and gradual output method with a slope. The drive module uses a high-frequency PWM dimming mode greater than 20kHz or an analog constant current dimming mode to gradually transition to the target lighting level power with a linear slope. S6. Dynamic Adaptive Monitoring: The system continuously executes steps S2-S5 in a loop, periodically updating the self-light interference coefficient and lighting level, and dynamically adapting to day-night cycles, weather changes, and road condition changes.

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