A remote control method for a full-spectrum LED street light system

Abstract

This invention belongs to the field of LED lighting control technology, specifically disclosing a remote control method for a full-spectrum LED street light system. The method includes: collecting the ambient illuminance of the target street light to determine whether light modulation is triggered; when triggered, determining the target total power based on the increase in ambient illuminance and vehicle light illuminance, and breaking it down into basic quotas for each channel according to the mixing ratio; injecting detection current into the PWM off-state gap of each channel, calculating the dynamic internal resistance based on the voltage response value at the acquisition end, calculating the aging coefficient based on the initial internal resistance, marking moderately to severely aged channels as those to be compensated, and calculating the compensation power and remaining power margin sequentially according to the aging coefficient; when the margin is greater than the compensation power, local superposition compensation is performed and control is executed; otherwise, subsequent compensation is stopped, and the information of uncompensated channels is encapsulated and uploaded to the cloud, where the cloud allocates the uncompensated power according to the remaining margin ratio of surrounding healthy street lights and executes control. This invention achieves adaptive compensation for channel aging and collaborative power compensation between street lights.

Description

Technical Field

[0001] This invention belongs to the field of LED lighting control technology and relates to a remote control method for a full-spectrum LED street light system. Background Technology

[0002] Full-spectrum LED streetlights typically employ a multi-channel independent drive and light mixing architecture, enabling them to dynamically adjust the output spectrum according to different times of day and weather conditions. This ensures both road surface illumination and visual comfort while also meeting energy-saving requirements. With the rapid development of IoT communication technology and cloud management platforms, remote control has become a standard feature of full-spectrum LED streetlight systems.

[0003] Currently, research on remote control of full-spectrum LED streetlight systems mainly focuses on communication networking efficiency, real-time cloud command delivery, and dynamic dimming strategies based on environmental perception. For example, Chinese invention patent CN121645602A discloses a full-spectrum LED streetlight system based on remote control and energy-saving analysis. This system includes: a multi-source data sensing module that collects and standardizes data in real time; a dual-mode collaborative communication module that efficiently transmits data and commands; a PINN constraint decision module that generates a precise control scheme and optimizes it through multi-dimensional error analysis; a single-lamp execution module that achieves smooth dimming and effect acquisition; and a data feedback iterative optimization module that dynamically adjusts model parameters and constraint thresholds through deviation analysis and incremental learning, forming a closed-loop optimization system. This system, through the fusion of multi-source data sensing and PINN constraint decision, enables LED streetlights to dynamically adapt to road, traffic, and environmental conditions, reducing energy consumption while ensuring lighting quality.

[0004] However, existing technologies for remote control of full-spectrum LED street light systems have the following obvious limitations:

[0005] First, this method only provides feedback control based on the macroscopic lighting effect, without considering the differences in the aging rate of the lamp beads in each channel. The macroscopic effect feedback alone is no longer sufficient to accurately restore the spectral shape, resulting in the spectral power distribution after light mixing continuously deviating from the initial set value. At the same time, this method cannot independently quantify and evaluate the aging degree of each channel, nor can it proactively perform differentiated power compensation for the aging channels before the execution of remote control commands, resulting in a lack of effective closed-loop maintenance means for full-spectrum fidelity throughout the entire life cycle.

[0006] Second, this method uses an independent control mode based on individual lamps, without considering spatial collaborative control between individual lamps and their adjacent streetlights. Consequently, when a single lamp cannot independently achieve the target spectral output, it can only passively accept the continuous deterioration of the spectral output until manual maintenance is required, thus affecting the overall stability of road lighting quality. Summary of the Invention

[0007] In view of this, in order to solve the problems mentioned in the background technology, a remote control method for a full-spectrum LED street light system is proposed.

[0008] The objective of this invention can be achieved through the following technical solution: This invention provides a remote control method for a full-spectrum LED street light system, comprising: collecting the current ambient illuminance of the target street light to determine whether light modulation is triggered; if triggered, determining the target total power based on the ambient illuminance and the vehicle light illuminance increment, and disassembling the basic quota of each channel according to the light mixing ratio.

[0009] During the PWM shutdown interval, a detection current is injected into each channel, the terminal voltage value of each channel is collected and the dynamic internal resistance is calculated. The aging coefficient of each channel is calculated in combination with the initial internal resistance. The channels whose aging coefficient falls into the medium-to-severe aging range are recorded as channels to be compensated. The compensation power of each channel to be compensated is calculated in descending order of aging coefficient, and the current remaining power margin of the target street light is read.

[0010] When the margin is greater than or equal to the compensation power, the compensation power is added to the base quota of the current channel to be compensated and power control is performed.

[0011] When the margin is less than the compensation power, compensation for subsequent channels to be compensated within the target street light is stopped. The identifier, aging coefficient, and location tag of the uncompensated channel are encapsulated as a snapshot and uploaded to the cloud. The cloud then allocates the uncompensated power according to the remaining margin ratio of the surrounding healthy street lights, generates an updated power value, and executes the corresponding power control.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention determines the target total power by combining the ambient illuminance and the vehicle light illuminance increment, so that the target total power takes into account both the ambient light change and the dynamic lighting needs of passing vehicles. At the same time, the target total power is decomposed into the basic quota of each channel according to the mixing ratio, so as to ensure that the initial drive quota of each channel matches the mixing target and avoid the mismatch of the initial output of different channels due to the unified power allocation.

[0013] (2) This invention calculates the dynamic internal resistance by injecting detection current and collecting terminal voltage value during the PWM turn-off gap, and calculates the aging coefficient by combining the initial internal resistance. The medium and severe aging channels are marked as channels to be compensated. Under the premise that normal lighting is not affected, the quantitative evaluation of the aging status of multiple channels is completed. This provides a quantifiable closed-loop maintenance method for full spectrum fidelity throughout the entire life cycle, and avoids the accumulation of aging differences between channels, which leads to the continuous deviation of the spectral power distribution from the initial set value.

[0014] (3) The present invention calculates the compensation power in descending order of aging coefficient and reads the current remaining power margin of the target street lamp. When the margin is greater than the compensation power, the compensation power is superimposed on the basic quota of the channel and the power control is executed, so that each aging channel can obtain the appropriate compensation in turn according to its own aging degree, and ensures the orderly allocation of compensation resources within a single lamp.

[0015] (4) This invention stops subsequent channel compensation when the margin is insufficient, encapsulates the uncompensated channel information into a snapshot and uploads it to the cloud. The cloud allocates the uncompensated power according to the remaining margin ratio of the surrounding healthy street lights and generates an updated power value to perform control. When the capacity of a single lamp is insufficient, neighborhood collaborative compensation is automatically triggered to approach the original control target in a spatial collaborative manner, thus avoiding continuous degradation of the spectrum. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram showing the connections between the steps of the method of the present invention;

[0018] Figure 2 This is a schematic diagram of the connection of the light modulation triggering determination step of the present invention;

[0019] Figure 3 This is a schematic diagram showing the connection steps of the power control execution process of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 As shown, the present invention provides a remote control method for a full-spectrum LED street light system, including the following steps S1 to S4.

[0022] In this invention, the channel refers to each primary color channel used for full-spectrum mixing, including independent driving branches such as warm white, cool white, amber, and cyan, which are referred to as channels in this paper.

[0023] S1. Trigger Detection, Determination of Target Total Power and Basic Quota Allocation

[0024] The current ambient illuminance of the target street light is collected to determine whether light modulation is triggered. If triggered, the target total power is determined based on the ambient illuminance and the increase in vehicle headlight illuminance, and the basic quota of each channel is broken down according to the light mixing ratio.

[0025] Please see Figure 2 As shown, exemplarily, determining whether light modulation is triggered includes:

[0026] The system retrieves the target streetlight's geographical location and the corresponding all-weather ambient illuminance trajectory curve for the current date from the cloud. This trajectory curve reflects the historical illuminance statistics of the target streetlight's location at different dates and times throughout the year. The standard illuminance value corresponding to the current time on the trajectory curve is used as the target illuminance value. The advantage of this approach is that the trigger threshold adapts to seasonal and temporal changes, avoiding the pitfalls of using a fixed threshold that leads to lights being turned on too early in the summer evening or turned off too late in the winter morning.

[0027] It should be noted that the acquisition of the all-weather environmental illuminance trajectory curve includes: collecting hourly measured environmental illuminance data for multiple dates adjacent to the current date in historical records for the geographical location of the target streetlight; removing extreme values ​​that deviate from the normal daylight illuminance pattern due to weather factors such as rain, fog, and haze by setting an illuminance fluctuation range; and statistically averaging the measured illuminance values ​​at the same time after removing extreme values ​​to generate a standardized trajectory curve for that location under normal daylight illuminance conditions. This curve is pre-stored in a cloud database for real-time retrieval.

[0028] Calculate the illuminance deviation between the current ambient illuminance and the target illuminance value. When the absolute value of the illuminance deviation is greater than the preset deviation threshold, it is preliminarily determined to trigger light control. If the illuminance deviation is positive, it indicates that the ambient light is sufficient, and light control in the direction of power reduction is triggered. If the illuminance deviation is negative, it indicates that the ambient light is insufficient, and light control in the direction of power increase is triggered.

[0029] It should be noted that the preset deviation threshold is determined based on the allowable illuminance fluctuation range corresponding to the lighting design level of the road where the target streetlight is located. The higher the road lighting design level (such as main roads and highways), the higher the requirement for illuminance stability, and the smaller the preset deviation threshold should be set accordingly; for secondary roads or branch roads, the threshold can be appropriately relaxed. The specific value of this threshold is a conventional design choice made by those skilled in the art based on the actual application scenario.

[0030] After initial triggering, to prevent false triggering due to transient interference such as vehicle lights, further anti-false triggering verification is required. Obtain the sequence of measured ambient illuminance values ​​from K consecutive sampling points prior to the current moment, calculate the illuminance change rate of this sequence, and if the absolute value of the illuminance change rate is less than a preset change rate threshold, then the illuminance change is determined to be a slow natural environmental change (such as sunset or cloudy days) rather than transient interference, thus triggering light modulation.

[0031] It should be noted that K represents the number of sampling points involved in the rate of change calculation, and its value is determined based on the sampling frequency of the ambient illuminance sensor and the duration of vehicle headlight interference in the road scene. The higher the sampling frequency, the larger the value of K should be to ensure that the selected sampling sequence covers a sufficient time span to distinguish between slow environmental changes and transient vehicle headlight interference. For example, K can be a positive integer between 5 and 15.

[0032] The preset rate of change threshold is used to distinguish between slow changes in ambient illuminance and sudden changes in illuminance caused by transient interference from vehicle headlights. This threshold is determined by collecting ambient illuminance change rate data for the road segment where the target streetlight is located during periods without vehicle traffic, and using the upper limit of the collected rate of change data in the statistical distribution as the preset rate of change threshold. The rate of change in ambient illuminance caused by weather factors such as sunset or cloudy days is less than this threshold, while the rate of change in illuminance caused by passing vehicle headlights is greater than this threshold, thus effectively distinguishing between the two types of changes.

[0033] If the absolute value of the illuminance change rate is greater than or equal to the preset change rate threshold, it is determined that the current illuminance change is caused by transient interference such as vehicle lights, and light control is not triggered. The current power output is maintained, and the deviation is re-determined in the next sampling cycle.

[0034] When the absolute value of the illuminance deviation is less than or equal to the preset deviation threshold, it is determined that light modulation will not be triggered.

[0035] For example, determining the target total power includes:

[0036] The illuminance deviation is input into the closed-loop control algorithm to obtain the environmental basic power requirement.

[0037] In one specific embodiment, the process of calculating the environmental baseline power demand using a closed-loop control algorithm includes:

[0038] Illuminance deviation As the input variable for the closed-loop control algorithm, the proportional-integral-derivative (PI-DE) control algorithm is used to calculate the environmental base power demand. The expression for the PI-DE control algorithm is: In the formula, Indicates the current control cycle number. This represents the illuminance deviation for the current period. This represents the illuminance deviation from the previous control cycle. This represents the illuminance deviation over the previous two control cycles. , and These are the proportional gain coefficient, integral gain coefficient, and differential gain coefficient, respectively.

[0039] The initial values ​​of each gain coefficient are determined based on the ratio of the rated total power of the target streetlight to the range of the illuminance sensor, and are adaptively adjusted during subsequent operation according to the convergence trend of the illuminance deviation. The adaptive adjustment rules are as follows: a convergence target range for the illuminance deviation is set; the sum of the absolute values ​​of the illuminance deviation over the previous M consecutive control cycles is used as the convergence performance index; if this index increases cycle by cycle over the previous M control cycles, the integral gain coefficient is increased in steps of 5% to 15% of the current integral gain coefficient value. If the sign of the illuminance deviation changes alternately over M consecutive control cycles, the proportional gain coefficient will be reduced in steps of 5% to 15% of the current proportional gain coefficient value. When the absolute value of the illuminance deviation is continuously within the convergence target range, each gain coefficient remains unchanged at its current value; where M is a positive integer between 5 and 20.

[0040] Calculated for each control cycle Then, clamping and limiting are performed with the rated maximum total power of the target streetlight as the upper limit and the minimum maintenance power as the lower limit to meet the basic power requirements of the output environment.

[0041] The effective peak value of the vehicle headlight illuminance increment within a preset time window is obtained, and multiplied by a preset headlight efficiency conversion coefficient to obtain the vehicle's dynamic power requirement. The headlight efficiency conversion coefficient is the streetlight compensation power corresponding to a unit vehicle headlight illuminance increment, and is predetermined through on-site calibration. Specifically, under nighttime conditions without interference from other light sources, the test vehicle is driven in a standard state within the target streetlight illumination range. Simultaneously, the illuminance increment generated by the ambient illuminance sensor due to the vehicle headlights and the compensation power of the target streetlight to maintain road illuminance are collected. The ratio of these two values ​​is used as the headlight efficiency conversion coefficient. The standard state includes: the test vehicle traveling at 50%–70% of the road's design speed limit in the lane directly below the target streetlight, with the vehicle's headlights in low beam mode, and the vehicle model and its headlight luminous flux remaining consistent during the calibration process.

[0042] The preset time window is determined based on the design speed of the road where the target street light is located and the spacing between the light poles: the upper limit of the design speed of the road where the target street light is located is obtained, the time required for a vehicle to travel across the spacing between adjacent light poles at that speed is calculated, and 1.5 to 2.5 times that time is used as the length of the preset time window.

[0043] The effective peak value refers to the maximum value among the local maximum values ​​of the vehicle headlight illuminance increment signal within the preset time window, which is retained after validity verification. The validity verification is as follows: if the duration of a local maximum value is less than a preset minimum duration threshold, or the amplitude of the local maximum value is less than a preset minimum amplitude threshold for vehicle headlight illuminance increment, then the local maximum value is discarded as an invalid signal.

[0044] If no valid peak value is detected within the current preset time window, the vehicle dynamic power requirement will be set to 0.

[0045] The environmental basic power requirement and the vehicle dynamic power requirement are weighted and summed to generate a preliminary total power.

[0046] It should be noted that the formula for calculating the preliminary total power is as follows: In the formula For the initial total power, To meet basic environmental power requirements, For vehicle dynamic power requirements, and The weights for environmental baseline power demand and vehicle dynamic power demand are used to quantify the different impacts of changes in ambient light and the dynamic lighting of passing vehicles on the street light output power. .For example, The value ranges from 0.6 to 0.9. The value ranges from 0.1 to 0.4; during peak traffic hours, The upper limit of 0.4 is used to enhance the lighting response to passing vehicles, especially during off-peak hours at night. The upper limit of 0.9 is adopted to prioritize basic lighting and energy conservation.

[0047] By calculating the preliminary total power through weighted summation, on the one hand, the weight allocation can reflect the actual weight of the impact of the environmental base power demand and the vehicle dynamic power demand on the target total power in different dimensions, reflecting the difference in the contribution of continuous changes in ambient illuminance and transient disturbances of vehicle lights to street lighting demand; on the other hand, it can directly integrate the information of steady-state ambient light demand and dynamic vehicle light demand, comprehensively consider the combined impact of the two on the street light output power, so that the generation of the target total power takes into account both lighting quality assurance and traffic safety requirements.

[0048] The weights can be obtained through multi-objective optimization methods. For example, the weights for increasing the dynamic power demand of vehicles during peak traffic hours. To enhance lighting response to passing vehicles; and to increase the weighting of ambient base power demand during off-peak hours at night. Priority will be given to ensuring basic lighting and energy conservation.

[0049] The target total power is output by clamping and limiting the rated maximum total power of the target streetlights as the upper limit and the minimum maintenance power as the lower limit.

[0050] It should be noted that the clamping and limiting process includes: if the initial total power is greater than the rated maximum total power, then the rated maximum total power is used as the target total power; if the initial total power is less than the minimum sustaining power, then the minimum sustaining power is used as the target total power; otherwise, the initial total power is used as the target total power.

[0051] The rated maximum total power is determined by the hardware topology and heat dissipation conditions of the target street light driver power supply, and represents the upper limit of the power that the driver power supply can continuously output. The minimum sustaining power is the sum of the minimum total power required for all channels of the target street light to emit light normally.

[0052] For example, the basic quota for splitting each channel includes:

[0053] Obtain the preset mixing ratio coefficients for each channel of the target street light. The mixing ratio coefficients are used to characterize the nominal proportion that each channel should occupy in the total power under the full-spectrum mixing target. At the same time, the sum of the mixing ratio coefficients of each channel is 1. Multiply the target total power by the mixing ratio coefficients of each channel to obtain the initial power value of each channel.

[0054] The initial power value of each channel is compared with its corresponding power range. The lower limit of the power range is the minimum sustaining power of the channel, and the upper limit of the power range is the rated maximum power of the channel. If the initial power value is greater than the upper limit of its power range, the initial power value of the channel is reduced to the upper limit of the power range, and the reduction difference of the channel is accumulated and recorded.

[0055] If the initial power value is less than the lower limit of its power range, the initial power value of the channel is raised to the lower limit of the power range, and the difference in raising the power value of the channel is accumulated and recorded.

[0056] If the initial power value falls within its power range, the initial power value of that channel will remain unchanged.

[0057] After the initial adjustment, if a reduction difference exists, the reduction difference will be allocated; if an increase difference exists, the increase difference will be allocated. The reduction difference and the increase difference do not exist simultaneously.

[0058] For the reduction difference allocation, channels whose current power value after initial adjustment has not reached the upper limit of the power range are selected. Based on the proportion of the remaining carrying capacity of each channel to the total remaining carrying capacity of all allocated channels, the reduction difference is allocated to each allocated channel, and the current power value of each channel is updated accordingly. The remaining carrying capacity is the difference between the rated maximum power of the channel and its current power value.

[0059] For the allocation of the boost difference, channels whose current power value has not reached the lower limit of the power range are selected. Based on the proportion of the surplus of each channel's current power value exceeding the lower limit of the power range to the total surplus of all available channels, the boost difference is allocated to each available channel, and the current power value of each channel is updated accordingly. The surplus proportion is the ratio of the difference between the current power value of the channel and the minimum maintenance power to the total surplus of all available channels.

[0060] The current power value obtained after allocation will be used as the base quota for each channel.

[0061] During the allocation process, if a channel touches the power boundary on the opposite side, it will be restricted to that boundary, and the unallocated difference will continue to be transferred to the remaining channels that still have allocation capacity, until all the difference is allocated or all channels have no remaining allocation capacity.

[0062] S2, Channel Aging Detection, Channel Marking and Compensation Power Calculation

[0063] During the PWM shutdown interval, a detection current is injected into each channel, the terminal voltage value of each channel is collected and the dynamic internal resistance is calculated. The aging coefficient of each channel is calculated in combination with the initial internal resistance. The channels whose aging coefficient falls into the medium-to-severe aging range are recorded as channels to be compensated. The compensation power of each channel to be compensated is calculated in descending order of aging coefficient, and the current remaining power margin of the target street light is read.

[0064] For example, the calculation of the aging factor includes:

[0065] Before loading the basic quota for each channel to execute spectral output, a detection current with a known and constant amplitude is sequentially injected into each channel using the turn-off gap of the PWM drive signal. The amplitude of the detection current is much lower than the rated operating current of each channel.

[0066] The terminal voltage values ​​of each channel are acquired synchronously during the current injection period. The terminal voltage values ​​include transient response components and steady-state response components: the transient terminal voltage value corresponding to the first sampling moment after the current injection, and the steady-state terminal voltage value when the current injection continues until the terminal voltage reading no longer changes within multiple consecutive sampling periods; wherein, the amplitude of the detection current is taken as 1% to 5% of the rated operating current of each channel, the first sampling moment is the first sampling point after the start of the current injection, the sampling frequency is not less than 100kHz, and the multiple consecutive sampling periods are 5 to 20 sampling periods.

[0067] The quotient obtained by dividing the transient terminal voltage value by the detection current is used as the current dynamic internal resistance of each channel, and the ratio of the steady-state terminal voltage value to the detection current is used as the current static internal resistance of each channel. The dynamic internal resistance mainly reflects the transient characteristics of the semiconductor PN junction and the electrode contact resistance, while the static internal resistance mainly reflects the overall on-resistance of the LED chip. Both characterize the health status of the LED chip from different time scales.

[0068] The initial dynamic internal resistance and initial static internal resistance of each channel are retrieved from the cloud, and the dynamic aging coefficient and static aging coefficient are calculated respectively. The initial dynamic internal resistance and initial static internal resistance are obtained by injecting a calibration current with the same amplitude as the detection current into the target street light at a standard ambient temperature before it leaves the factory, measuring the transient terminal voltage and steady-state terminal voltage of each channel, and storing the calculated values ​​in the cloud for subsequent retrieval.

[0069] The dynamic aging coefficient and the static aging coefficient are weighted and fused to obtain the aging coefficient of each channel.

[0070] It should be noted that the formula for calculating the aging coefficient is as follows: In the formula For the first The aging coefficient of each channel, For the first The dynamic aging coefficient of each channel, For the first The static aging factor of each channel, and These are the weights of the dynamic aging coefficient and the static aging coefficient, respectively, used to quantify the differences in the contribution of internal resistance changes to aging assessment at different time scales.

[0071] By using weighted fusion to calculate the aging coefficient of each channel, on the one hand, the weight allocation can reflect the actual weight of the influence of dynamic internal resistance and static internal resistance on different dimensions of channel aging degree, and reflect the difference in contribution of PN junction transient characteristic change and overall conduction resistance change to aging assessment; on the other hand, it can integrate internal resistance detection information of both transient and steady state time scales, and avoid assessment bias caused by detection timing or interference factors of a single internal resistance type.

[0072] The weights can be obtained through experimental data. For example, dynamic internal resistance, static internal resistance, and corresponding luminous flux attenuation data of each channel under different usage durations are collected in advance. The correlation coefficients between the dynamic internal resistance change rate, the static internal resistance change rate, and the luminous flux attenuation rate are calculated respectively. Regression analysis is used to determine the contribution of each to the degree of aging, and after normalization, these are converted into weights. and The sum of these values ​​is 1, and the aging coefficient of each channel is obtained by quantification.

[0073] For example, calculating the compensation power of each channel to be compensated includes:

[0074] The aging coefficient of each channel is compared with the membership degree of a preset multi-level aging threshold range. The multi-level aging threshold range includes a slight aging range, a moderate aging range, and a severe aging range. If the aging coefficient falls into the moderate aging range or the severe aging range, the channel is marked as a channel to be compensated.

[0075] In one specific embodiment, the aging coefficient is defined based on the initial dynamic internal resistance and the initial static internal resistance. The multi-level aging threshold range is determined by the following calibration method: Samples of LED beads from the same batch used in the target streetlight are taken and subjected to accelerated aging tests at rated current and a preset ambient temperature (e.g., 85°C). The aging coefficient and corresponding luminous flux maintenance rate are measured simultaneously at different cumulative lighting durations. The luminous flux maintenance rate dropping to 95% and 85% are used as the dividing points for slight, moderate, and severe aging. The aging coefficient values ​​corresponding to each dividing point are recorded. After repeated tests, the statistical average is taken as the multi-level aging threshold for that batch of LED beads.

[0076] Based on the above calibration method, in a specific test case, the critical aging coefficient values ​​for this batch of LED chips when the luminous flux maintenance rate dropped to 95% and 85% were approximately 1.15 and 1.35, respectively. Accordingly, the threshold range for this specific test case is divided into: the slight aging range is... The moderate aging range is The severe aging range is greater than or equal to 1.35.

[0077] It should be noted that the above threshold ranges are merely exemplary data provided in this application based on specific LED models and specific test conditions, and are not absolute limitations on the multi-level aging threshold ranges. The aging characteristics of different models and batches of LED chips vary, and the corresponding specific boundary point values ​​will differ. Those skilled in the art, when implementing this application, can obtain threshold ranges suitable for the current LED chip model using the same calibration method as described in this embodiment.

[0078] The compensation power of each channel to be compensated is calculated in descending order of aging coefficient.

[0079] Obtain the basic quota and aging coefficient of each channel to be compensated, and multiply the aging coefficient by the preset unit aging compensation coefficient to obtain the power compensation rate. The unit aging compensation coefficient represents the proportion of power compensation required for each unit increase in the aging coefficient, and it is pre-calibrated in the following way: obtain the measured values ​​of the aging coefficient and the corresponding luminous flux attenuation rate of the lamps used in the target street light under different cumulative lighting times in accelerated aging tests; conduct power-luminous flux calibration tests on the same batch of unaged lamps to establish a mapping relationship between luminous flux and driving power; according to the mapping relationship, convert the luminous flux attenuation rate under each aging degree into the power increment required to restore to the preset target luminous flux; perform linear fitting with the power increment as the dependent variable and the aging coefficient as the independent variable, and use the slope obtained from the fitting as the unit aging compensation coefficient.

[0080] Multiply the base quota by the power compensation rate to obtain the theoretical compensation power for each channel to be compensated.

[0081] Obtain the rated maximum power of each channel to be compensated. The rated maximum power is the inherent electrical parameter of each channel that is pre-stored in the local controller when the target street light leaves the factory. The difference between the rated maximum power and the basic quota is used as the upper limit of the remaining power that each channel to be compensated can bear.

[0082] The theoretical compensation power is compared with the upper limit of the remaining bearable power, and the smaller value is taken as the compensation power of the corresponding channel to be compensated, so that the compensation power of the channel is limited to within the upper limit of the remaining bearable power.

[0083] For example, reading the current remaining power margin of the target street light includes:

[0084] Obtain the rated maximum total power of the target streetlight.

[0085] Before the aging factor calculation is completed and power compensation is performed, the actual operating power of each channel at the current moment is collected, and the collected actual operating power of each channel is accumulated to generate the current total operating power.

[0086] The difference between the rated maximum total power and the current total operating power is taken as the current remaining power margin of the target street light. This margin represents the total additional power capacity that the target street light can currently output at the driver power supply hardware level.

[0087] S3, Local Self-Compensation Adjudication and Enforcement

[0088] When the margin is greater than or equal to the compensation power, the compensation power is added to the base quota of the current channel to be compensated and power control is performed.

[0089] Please see Figure 3 As shown, exemplarily, the power control includes:

[0090] The channel with the highest aging coefficient is selected as the current channel to be compensated, and the following local compensation loop operations are executed sequentially according to the aging coefficient from largest to smallest:

[0091] The compensation power of the current channel to be compensated is added to the basic quota of the channel to generate the updated power value of the channel.

[0092] The compensation power is deducted from the current remaining power margin to update the current remaining power margin.

[0093] The next channel to be compensated is taken as the new current channel to be compensated, and the local compensation loop operation is continued until all channels to be compensated have completed the generation of updated power values.

[0094] After all channels to be compensated are updated, the updated power value of each channel to be compensated is used as the execution power value of each channel to be compensated, and the base quota of the remaining channels that are not marked as channels to be compensated is used as the execution power value of the remaining channels.

[0095] If the compensation power at a certain channel to be compensated is greater than or equal to the current remaining power margin, then local compensation for the current and all subsequent channels to be compensated within the target street light is stopped. The current channel to be compensated and all subsequent channels to be compensated that have not yet been processed are collectively referred to as uncompensated channels, and the process proceeds to step S4 to execute the cloud-based collaborative compensation branch.

[0096] The execution power value of each channel is limited: if the execution power value exceeds the upper limit of the power range of the channel, the upper limit value is used as the final execution power value of the channel.

[0097] If the execution power value is lower than the lower limit of the channel's power range, then the lower limit will be used as the final execution power value for that channel.

[0098] If the executed power value falls within the power range of the channel, then the executed power value is used as the final executed power value of the channel, and the corresponding power control is performed according to the final executed power value of each channel.

[0099] S4, Cloud Neighborhood Collaborative Compensation Branch

[0100] When the margin is less than the compensation power, compensation for subsequent channels within the target streetlight is stopped. The identifier, aging coefficient, and location tag of the uncompensated channel are encapsulated as a snapshot and uploaded to the cloud. The cloud then allocates the uncompensated power according to the remaining margin ratio of surrounding healthy streetlights, generates updated power values, and executes corresponding power control. Here, the uncompensated channel refers to the current channel to be compensated and all subsequent unprocessed channels to be compensated. The geographic location tag includes latitude and longitude coordinates or light pole number information.

[0101] For example, the allocation of uncompensated power by the cloud according to the remaining margin ratio of surrounding healthy streetlights includes:

[0102] The identifier, aging coefficient, and location tag of the uncompensated channel are encapsulated into a snapshot. The data structure of the snapshot includes, but is not limited to: a unique identifier for the target streetlight, a geographic location tag, and a list of uncompensated channels (each channel includes a channel identifier, aging coefficient, and compensation power). The snapshot is uploaded to the cloud management platform via an uplink communication link.

[0103] If the target street light does not receive an allocation response instruction from the cloud within the preset timeout period after sending the snapshot, the current communication link is determined to be abnormal. The target street light immediately enters the degradation maintenance mode and continues to operate with the minimum value as the execution power value to maintain the basic road lighting. At the same time, the target street light retransmits the snapshot in the next communication cycle. If no response is received after a preset number of consecutive retransmissions, retransmission is stopped and a communication fault identifier is recorded. After the communication link is restored, the snapshot is re-uploaded, and a fault log is reported to the cloud management platform.

[0104] The cloud receives the snapshot, parses out the compensation power and location tag of each uncompensated channel, and adds up the compensation power of each uncompensated channel to obtain the total uncompensated power.

[0105] Using the parsed location tag as the center, candidate streetlights within a preset geographical radius are retrieved. Streetlights whose channels do not fall into the moderate to severe aging range are marked as healthy streetlights. The preset geographical radius can be pre-set according to road lighting design specifications and pole spacing, typically 3 to 5 times the pole spacing, to ensure that the illumination from the compensating pole can effectively cover the area where the target pole is located.

[0106] Obtain the current remaining power margin of each healthy street light, and sum the current remaining power margins of all healthy street lights to obtain the total margin of the surrounding area.

[0107] Based on the proportion of the current remaining power margin of each healthy street light to the total surrounding power margin, the total uncompensated power is allocated to each healthy street light, resulting in the allocated power value for each healthy street light. Specifically, for the first... Each healthy street light has a power distribution value of [value missing]. In the formula For the first The allocated power value for each health-related street light, that is, the additional power that the street light needs to output. The uncompensated total power represents the total power shortfall that the target streetlights cannot bear on their own due to insufficient local margin. For the first The current remaining power margin of a healthy street light represents the upper limit of additional power that the street light can currently handle. The sum of the current remaining power margins of all healthy streetlights represents the total available compensation capacity in the surrounding area.

[0108] After the updated power value is sent from the cloud, a command confirmation timer is started. If no confirmation response is received from the controlled street light within the preset confirmation timeout period, the sending is deemed to have failed. The cloud retains the allocation scheme within the preset compensation period and resends it after communication is restored. If the sending is still not completed within the preset compensation period, the compensation request is marked as invalid and an alarm is pushed to the operation and maintenance terminal.

[0109] When multiple target streetlights simultaneously upload snapshots to the cloud, the cloud processes each compensation request in the order of the received timestamps. After each healthy streetlight is allocated power, its current remaining power margin is immediately reduced by the allocated value. Subsequent compensation requests are recalculated and allocated based on the reduced margin value.

[0110] For example, generating the updated power value includes:

[0111] The uncompensated total power is allocated to each healthy street light according to the stated ratio, resulting in an allocated power value for each healthy street light. If the allocated power value of any healthy street light exceeds its actual load capacity, the actual load capacity is taken as the effective allocation value for that street light. The difference is then redistributed according to the ratio of the actual load capacity of the remaining healthy street lights to the total actual load capacity of the remaining healthy street lights. This process is iterated until the difference is completely allocated or all healthy street lights reach their rated maximum total power. If there is still unallocated power after all healthy street lights have reached their rated maximum total power, this remaining power is recorded as a compensation gap and pushed to the cloud management platform as a maintenance reminder. The actual load capacity is the difference between the rated maximum total power of the healthy street light and its current output power.

[0112] The allocated power value of each health street light is superimposed with the current output power of the corresponding health street light to generate a temporary superimposed power value.

[0113] If the temporary superimposed power value is less than or equal to the rated maximum total power of the corresponding health street light, then the temporary superimposed power value is used as the renewal power value of the health street light; otherwise, the rated maximum total power is used as the renewal power value of the health street light.

[0114] For the target streetlights, their total power target value is lowered to a minimum value, and degraded output is implemented. The minimum value is determined based on the sum of the current basic quotas of the target streetlights or the sum of the minimum maintenance power of each channel. The degraded output of the target streetlights is spatially superimposed with the incremental output of each healthy streetlight, approximating the original control target on a regional group basis.

[0115] Optionally, the cloud sends a remote enhancement command carrying an interlock tag to each healthy street light undertaking compensation. During the validity period, the interlock tag prohibits the corresponding healthy street light from responding to any energy-saving power reduction command. The validity period of the interlock tag is dynamically managed by the cloud according to the compensation demand status of the target street light. When the compensation demand has been fully distributed or the cloud issues a release command, the interlock tag becomes invalid.

[0116] This invention constructs a complete remote control process for full-spectrum LED streetlights through the aforementioned steps S1 to S4. By systematically integrating environmental triggering perception, channel-level aging online diagnosis, local margin self-compensation, and cloud-based neighborhood collaborative compensation, it provides quantitative control methods and collaborative guarantee mechanisms for the spectral fidelity and driving safety of full-spectrum LED streetlights throughout their entire lifecycle.

[0117] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, in the form of a computer program product.

[0118] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0119] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0120] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0121] Finally, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A remote control method for a full-spectrum LED street light system, characterized in that: The method includes: The current ambient illuminance of the target street light is collected to determine whether light modulation is triggered. If it is triggered, the target total power is determined based on the ambient illuminance and the increase in vehicle headlight illuminance, and the basic quota of each channel is broken down according to the light mixing ratio. During the PWM off interval, a detection current is injected into each channel, the terminal voltage value of each channel is collected and the dynamic internal resistance is calculated. The aging coefficient of each channel is calculated in combination with the initial internal resistance. The channel whose aging coefficient falls into the medium-to-severe aging range is recorded as the channel to be compensated. The compensation power of each channel to be compensated is calculated in descending order of aging coefficient, and the current remaining power margin of the target street light is read. When the margin is greater than or equal to the compensation power, the compensation power is added to the base quota of the current channel to be compensated and power control is performed. When the margin is less than the compensation power, compensation for subsequent channels to be compensated within the target street light is stopped. The identifier, aging coefficient, and location tag of the uncompensated channel are encapsulated as a snapshot and uploaded to the cloud. The cloud then allocates the uncompensated power according to the remaining margin ratio of the surrounding healthy street lights, generates an updated power value, and executes the corresponding power control.

2. The remote control method for a full-spectrum LED street light system according to claim 1, characterized in that: The determination of whether light modulation is triggered includes: Obtain the target street light's geographical location and the all-weather ambient illuminance trajectory curve corresponding to the current date from the cloud, and use the standard illuminance value corresponding to the trajectory curve at the current time as the target illuminance value; Calculate the illuminance deviation between the current ambient illuminance and the target illuminance value. When the absolute value of the illuminance deviation is greater than the preset deviation threshold, it is preliminarily determined that light modulation is triggered. After the initial triggering is determined, the sequence of measured ambient illuminance values ​​of K consecutive sampling points before the current time is obtained, and the illuminance change rate of the sequence is calculated. If the absolute value of the illuminance change rate is less than the preset change rate threshold, then the light modulation is determined to be triggered. If the absolute value of the rate of change of illuminance is greater than or equal to the preset rate of change threshold, then it is determined that light modulation will not be triggered. When the absolute value of the illuminance deviation is less than or equal to the preset deviation threshold, it is determined that light modulation will not be triggered.

3. The remote control method for a full-spectrum LED street light system according to claim 2, characterized in that: The determination of the target total power includes: The illuminance deviation is input into the closed-loop control algorithm to obtain the environmental basic power requirement. The effective peak value of the vehicle headlight illuminance increment within a preset time window is obtained, and multiplied by the preset headlight efficiency conversion coefficient to obtain the vehicle dynamic power requirement. The environmental baseline power requirement and the vehicle dynamic power requirement are weighted and summed to generate a preliminary total power. The target total power is output by clamping and limiting the rated maximum total power of the target streetlights as the upper limit and the minimum maintenance power as the lower limit.

4. The remote control method for a full-spectrum LED street light system according to claim 1, characterized in that: The basic quota for dismantling each channel includes: Obtain the preset mixing ratio coefficients for each channel of the target street light, and multiply the target total power by the mixing ratio coefficients for each channel to obtain the initial power value for each channel; The initial power value of each channel is compared with its corresponding power range. If the initial power value is greater than the upper limit of its power range, the initial power value of the channel is reduced to the upper limit of the power range, and the reduction difference of the channel is accumulated and recorded. If the initial power value is less than the lower limit of its power range, the initial power value of the channel is raised to the lower limit of the power range, and the difference in raising the power value of the channel is accumulated and recorded. If the initial power value falls within its power range, the initial power value of that channel will remain unchanged. For the reduction difference allocation, channels whose current power value after initial adjustment has not reached the upper limit of the power range are selected. Based on the proportion of the remaining carrying capacity of each channel to the total remaining carrying capacity of all allocated channels, the reduction difference is allocated to each allocated channel, and the current power value of each channel is updated accordingly. For the allocation of the lifting difference, channels whose current power value has not reached the lower limit of the power range are selected. Based on the proportion of the surplus of each channel's current power value exceeding the lower limit of the power range to the total surplus of all allocated channels, the lifting difference is allocated to each allocated channel, and the current power value of each channel is updated accordingly. The current power value obtained after allocation will be used as the base quota for each channel.

5. The remote control method for a full-spectrum LED street light system according to claim 1, characterized in that: The calculation of the aging coefficient includes: Obtain the transient and steady-state terminal voltage values ​​for each channel; The quotient obtained by dividing the transient terminal voltage value by the detection current is used as the current dynamic internal resistance of each channel, and the ratio of the steady-state terminal voltage value to the detection current is used as the current static internal resistance of each channel. The initial dynamic internal resistance and initial static internal resistance of each channel are retrieved from the cloud, and the dynamic aging coefficient and static aging coefficient are calculated respectively. The dynamic aging coefficient and the static aging coefficient are weighted and fused to obtain the aging coefficient of each channel.

6. The remote control method for a full-spectrum LED street light system according to claim 1, characterized in that: The calculation of the compensation power for each channel to be compensated includes: Obtain the basic quota and aging coefficient of each channel to be compensated, and multiply the aging coefficient by the preset unit aging compensation coefficient to obtain the power compensation rate; Multiply the base quota by the power compensation rate to obtain the theoretical compensation power for each channel to be compensated; Obtain the rated maximum power of each channel to be compensated, and use the difference between the rated maximum power and the basic quota as the upper limit of the remaining bearable power of each channel to be compensated. The theoretical compensation power is compared with the upper limit of the remaining bearable power, and the smaller value between the two is taken as the compensation power of the corresponding channel to be compensated.

7. The remote control method for a full-spectrum LED street light system according to claim 1, characterized in that: The reading of the target street light's current remaining power margin includes: Obtain the rated maximum total power of the target streetlights; Collect the actual operating power of each channel at the current moment, and accumulate the collected actual operating power of each channel to generate the current total operating power; The difference between the rated maximum total power and the current total operating power is used as the current remaining power margin of the target street light.

8. The remote control method for a full-spectrum LED street light system according to claim 1, characterized in that: The power control includes: The channel with the largest aging coefficient is selected as the current channel to be compensated. The compensation power of the current channel to be compensated is added to the basic quota of the channel to generate the updated power value of the channel. The compensation power is deducted from the current remaining power margin to update the current remaining power margin; The next channel to be compensated is taken as the new current channel to be compensated, and the local compensation loop operation is continued until all channels to be compensated have completed the generation of updated power values; After all channels to be compensated are updated, the updated power value of each channel to be compensated is used as the execution power value of each channel to be compensated, and the base quota of the remaining channels that are not marked as channels to be compensated is used as the execution power value of the remaining channels. If the execution power value exceeds the upper limit of the channel's power range, the upper limit value will be used as the final execution power value for that channel. If the execution power value is lower than the lower limit of the channel's power range, then the lower limit will be used as the final execution power value for that channel. If the executed power value falls within the power range of the channel, then the executed power value is used as the final executed power value of the channel, and the corresponding power control is performed according to the final executed power value of each channel.

9. The remote control method for a full-spectrum LED street light system according to claim 1, characterized in that: The allocation of uncompensated power by the cloud according to the remaining margin ratio of surrounding healthy streetlights includes: The cloud receives the snapshot, parses out the compensation power and location tag of each uncompensated channel, and adds up the compensation power of each uncompensated channel to obtain the total uncompensated power; Using the parsed location label as the center, the candidate streetlights within the preset geographical radius are searched, and the streetlights whose channels do not fall into the medium to severe aging range are marked as healthy streetlights. Obtain the current remaining power margin of each healthy street light, and sum the current remaining power margins of all healthy street lights to obtain the total margin of the surrounding area; The uncompensated power is allocated to each healthy street light according to the proportion of the current remaining power margin of each healthy street light to the total margin of the surrounding area, thus obtaining the allocated power value of each healthy street light.

10. A remote control method for a full-spectrum LED street light system according to claim 9, characterized in that: The generation of updated power values ​​includes: The allocated power value of each health street light is superimposed with the current output power of the corresponding health street light to generate a temporary superimposed power value; If the temporary superimposed power value is less than or equal to the rated maximum total power of the corresponding health street light, then the temporary superimposed power value is used as the renewal power value of the health street light; otherwise, the rated maximum total power is used as the renewal power value of the health street light.

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