A light-emitting brightness control method, system and general-purpose dual-voltage SMD lamp strip

Abstract

The present application relates to the field of light-emitting diode lighting and intelligent driving control, in particular to a light-emitting brightness control method and system and a general double-voltage SMD lamp strip, comprising: obtaining an initial input voltage of an input power supply, determining a target power supply mode, and taking corresponding voltage and current as reference voltage and reference driving current; obtaining real-time input voltage, maximum node temperature and maximum strain value, calculating voltage deviation, temperature deviation and strain deviation; respectively calculating voltage compensation value, temperature compensation value and strain compensation value, and superimposing to obtain target current; comparing actual driving current with target current and adjusting driving control instruction, and outputting to a driving module when error meets requirements, so as to realize light-emitting brightness control; the present application can maintain light-emitting brightness within a preset error range under the combined action of input voltage change, heating and temperature rise and flexible substrate bending, and avoid device overheating.

Description

Technical Field

[0001] This invention relates to the field of LED lighting and intelligent drive control, specifically to a method and system for controlling luminous intensity and a universal dual-voltage SMD LED strip. Background Technology

[0002] Existing dual-voltage flexible LED strips typically include a flexible substrate, a light-emitting unit, and a driving circuit. In related technologies, to adapt to different input voltages and adjust the strip brightness, fixed-parameter driving methods are usually employed, or only a single dimming method is used to control the driving current. Furthermore, some solutions detect and adjust a single factor in the input voltage or temperature. However, when input voltage fluctuations, strip temperature rise, and bent installation conditions coexist, the former method struggles to maintain brightness stability under different power supply modes, while the latter method, lacking coordinated handling of multiple disturbances, is prone to brightness fluctuations, localized overheating, or abnormal light emission after bending. Therefore, the LED strip brightness control methods in related technologies cannot simultaneously achieve dual-voltage adaptability, light emission stability, and operational reliability under abnormal conditions. Summary of the Invention

[0003] The purpose of this invention is to provide a method, system, and universal dual-voltage SMD LED strip for controlling luminous intensity, avoiding brightness fluctuations, localized overheating, or abnormal luminous emission after bending due to a lack of coordinated handling of various disturbance factors. Furthermore, it simultaneously ensures dual-voltage adaptability, luminous stability, and operational reliability under abnormal conditions. Specifically, the technical solution of this invention is as follows: A method for controlling luminous intensity, applied to a luminous intensity control system including a light strip and a driving module, includes the following steps: Obtain the initial input voltage of the input power supply, determine the target power supply mode from the preset power supply modes, and use the voltage and current corresponding to the target power supply mode as the reference voltage and the reference drive current, respectively. The real-time input voltage of the input power supply, the highest node temperature of the lamp strip, and the maximum strain value of the lamp strip are obtained respectively. Combined with the reference voltage, the preset safe operating temperature threshold, and the preset strain threshold, the corresponding voltage deviation, temperature deviation, and strain deviation are determined respectively. The compensation value is determined based on the voltage deviation, temperature deviation, and strain deviation, and the target current is generated by combining the reference drive current and the compensation value. The actual drive current is obtained, and the drive control command is adjusted and output to the drive module according to the current deviation between the actual drive current and the target current until the current deviation is less than or equal to the preset allowable error value.

[0004] Preferably, the process for determining the target power supply mode is as follows: If the initial input voltage is within the first preset voltage range, then the first power supply mode is determined as the target power supply mode, and the reference voltage is set to 12V; If the initial input voltage is within the second preset voltage range, then the second power supply mode is determined as the target power supply mode, and the reference voltage is set to 24V; wherein the first preset voltage range and the second preset voltage range do not overlap.

[0005] Preferably, the compensation values ​​include voltage compensation values, temperature compensation values, and strain compensation values, which are determined as follows: The voltage compensation value is determined based on the voltage deviation, the preset voltage compensation coefficient, and the proportional relationship between the reference voltage and the reference drive current. When the highest node temperature exceeds the preset safe operating temperature threshold but does not exceed the preset derating temperature threshold, the temperature compensation value is determined to be negative based on the temperature deviation and the preset temperature derating coefficient. When the maximum strain value exceeds the preset strain threshold, the strain compensation value is determined to be positive based on the strain deviation and the preset strain compensation coefficient; when the highest node temperature is not higher than the preset safe operating temperature threshold, the temperature compensation value is zero; when the maximum strain value is not higher than the preset strain threshold, the strain compensation value is zero.

[0006] Preferably, the process of obtaining the real-time input voltage, the highest node temperature, and the maximum strain value further includes: Establish a system synchronization clock, and based on the synchronization clock, time-align the acquired real-time input voltage, highest node temperature, maximum strain value and actual drive current, and remove abnormal data that exceed the preset physical range. If a single data acquisition node used to obtain the highest node temperature or maximum strain value fails to return valid data for a preset number of consecutive times, the data acquisition node is determined to be in a disconnected state, and the average value of the data from two normal data acquisition nodes that are physically adjacent to the disconnected data acquisition node is obtained as the replacement data.

[0007] Preferably, it also includes a limit protection process: If the highest node temperature exceeds the preset derating temperature threshold, or the absolute value of the ratio of voltage deviation to reference voltage exceeds the preset fluctuation limit, the target current update will be stopped, and the product of the preset low-power protection coefficient and the reference drive current will be used as the updated target current for direct output. The preset low-power protection coefficient is greater than zero and less than one.

[0008] A light emission brightness control system, comprising: The data acquisition module is used to acquire the initial input voltage to determine the reference voltage and reference drive current, and to acquire the real-time input voltage, the highest node temperature, and the maximum strain value. The parameter calculation module is used to determine the corresponding voltage deviation, temperature deviation, and strain deviation based on the real-time input voltage, the highest node temperature, and the maximum strain value. The current update module is used to calculate the compensation value based on the voltage deviation, temperature deviation and strain deviation, and to obtain the target current by combining it with the reference drive current; The control execution module is used to adjust the drive control command according to the current deviation between the actual drive current and the target current in order to control the drive module.

[0009] A universal dual-voltage SMD light strip includes: a flexible substrate, a light-emitting diode (LED) unit disposed on the flexible substrate, and a light-emitting brightness control system as described in claim 6; The data acquisition module includes an input power monitoring module, a temperature sensing module, and a strain sensing module; the control execution module includes a current sampling module. The input power monitoring module is connected in parallel to the power input terminal of the general-purpose dual-voltage SMD LED strip; Temperature sensing modules are arranged in an array with equal spacing along the flexible substrate; The strain sensing module is attached to a pre-set location of bending stress concentration on the flexible substrate; The current sampling module is connected in series in the driving circuit used to drive the light-emitting diode unit; The luminance control system also includes a microcontroller and a current drive module. The microcontroller is connected to the input power monitoring module, temperature sensing module, strain sensing module, current sampling module and current drive module respectively. The current drive module is used as a drive module to adjust the actual drive current flowing through the light-emitting diode unit.

[0010] Preferably, in the wiring of the flexible substrate, a constant current diode is connected in series at the location where the bending stress is concentrated; Constant current diodes are used for step-down and current-limiting protection when a flexible substrate undergoes mechanical bending, causing the drive circuit to disconnect and fail.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention obtains the initial input voltage of the input power supply and determines the target power supply mode from the preset power supply mode accordingly. The corresponding voltage and current are used as the reference voltage and the reference driving current, respectively. This enables the light strip to call the matching operating parameters when connected to different input voltages, thereby avoiding the adjustment inaccuracy caused by using the same driving reference under different voltage systems and improving the dual voltage adaptation capability. 2. This invention calculates voltage compensation value, temperature compensation value and strain compensation value according to voltage deviation, temperature deviation and strain deviation respectively, and sums the compensation values ​​and superimposes them with the reference driving current to obtain the target current. It can uniformly convert different disturbance factors into the correction amount of the same driving current, so as to maintain the working state corresponding to the calibrated brightness under the combined effects of input voltage change, temperature rise and flexible substrate bending, and improve the luminous stability. 3. This invention avoids unnecessary over-response to normal operating conditions by setting the temperature compensation value to zero when the temperature does not exceed the safe operating temperature threshold, setting the strain compensation value to zero when the strain does not exceed the preset strain threshold, and performing current reduction processing after the temperature enters the derating range, thereby balancing brightness maintenance and thermal load suppression. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application and the prior art, the accompanying drawings used in the description of the embodiments and the prior art will be briefly introduced below: Figure 1 This is a schematic flowchart of a method for controlling luminous intensity provided in an embodiment of this application; Figure 2 This is a schematic diagram of a luminance control system provided in an embodiment of this application. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0014] A method for controlling luminous intensity, applied to a luminous intensity control system including a light strip and a driving module, includes the following steps: Obtain the initial input voltage of the input power supply, determine the target power supply mode from the preset power supply modes, and use the voltage and current corresponding to the target power supply mode as the reference voltage and the reference drive current, respectively. The real-time input voltage of the input power supply, the highest node temperature of the lamp strip, and the maximum strain value of the lamp strip are obtained respectively. Combined with the reference voltage, the preset safe operating temperature threshold, and the preset strain threshold, the corresponding voltage deviation, temperature deviation, and strain deviation are determined respectively. The compensation value is determined based on the voltage deviation, temperature deviation, and strain deviation, and the target current is generated by combining the reference drive current and the compensation value. The actual drive current is obtained, and the drive control command is adjusted and output to the drive module according to the current deviation between the actual drive current and the target current until the current deviation is less than or equal to the allowable error value. The process for determining the target power supply mode is as follows: If the initial input voltage is within the first preset voltage range, then the first power supply mode is determined as the target power supply mode, and the reference voltage is set to 12V; If the initial input voltage is within the second preset voltage range, then the second power supply mode is determined as the target power supply mode, and the reference voltage is set to 24V; wherein, the first preset voltage range and the second preset voltage range do not overlap. The compensation values ​​include voltage compensation values, temperature compensation values, and strain compensation values, which are determined as follows: The voltage compensation value is determined based on the voltage deviation, the preset voltage compensation coefficient, and the proportional relationship between the reference voltage and the reference drive current. When the highest node temperature exceeds the preset safe operating temperature threshold but does not exceed the preset derating temperature threshold, the temperature compensation value is determined to be negative based on the temperature deviation and the preset temperature derating coefficient. When the maximum strain value exceeds the preset strain threshold, the strain compensation value is determined to be positive based on the strain deviation and the preset strain compensation coefficient; when the highest node temperature is not higher than the preset safe operating temperature threshold, the temperature compensation value is zero; when the maximum strain value is not higher than the preset strain threshold, the strain compensation value is zero. The process of obtaining real-time input voltage, highest node temperature, and maximum strain value also includes: Establish a system synchronization clock, and based on the synchronization clock, time-align the acquired real-time input voltage, highest node temperature, maximum strain value and actual drive current, and remove abnormal data that exceed the preset physical range. If a single data acquisition node used to obtain the highest node temperature or maximum strain value fails to return valid data for a preset number of consecutive times, the data acquisition node is determined to be in a disconnected state, and the average value of the data from two normal data acquisition nodes that are physically adjacent to the disconnected data acquisition node is obtained as the replacement data. It also includes the limit protection process: If the highest node temperature exceeds the preset derating temperature threshold, or the absolute value of the ratio of voltage deviation to reference voltage exceeds the preset fluctuation limit, the target current update will be stopped, and the product of the preset low-power protection coefficient and the reference drive current will be used as the updated target current for direct output. The preset low-power protection coefficient is greater than zero and less than one.

[0015] This invention provides a method for controlling luminous intensity, such as... Figure 1 As shown, it is applied to a light emission control system that includes a light strip and a driver module; The basic processing steps of this method are as follows: First, identify the power supply mode corresponding to the input power supply, and determine the reference voltage and reference drive current accordingly; then, synchronously acquire the real-time input voltage, the highest node temperature of the lamp strip, and the maximum strain value of the lamp strip. Based on this, voltage compensation value, temperature compensation value and strain compensation value are generated respectively, and the target current is updated accordingly; the target current is compared with the actual drive current, and the drive control command is output when the error meets the requirements, and the drive control command is adjusted when the error does not meet the requirements. Under the above processing mechanism, the light strip can still maintain the luminous brightness that meets the preset threshold under the combined effects of input voltage change, heat generation and flexible substrate bending, while avoiding brightness fluctuations and device overheating caused by relying solely on a single dimming method. Furthermore, based on the above embodiments, the steps of the method are described as follows: obtain the initial input voltage of the input power supply, identify the power supply mode of the input power supply based on the initial input voltage, and determine the target power supply mode; wherein, the initial input voltage refers to the power supply input voltage value obtained by the input power supply monitoring module during the system power-on identification phase, such as the stable voltage value read during the identification period after the light strip is connected to the DC power supply. This voltage value is not used to directly drive brightness adjustment, but to distinguish which set of rated parameters the current system should operate according to; this invention, by identifying the power supply mode in advance, changes the originally indiscriminate input compatibility processing into a mode-based parameter calling processing method, thereby avoiding misadjustment caused by using the same driving reference under different voltage systems; it can achieve accurate identification of the power supply mode based on the initial input voltage, avoiding subsequent compensation inaccuracies caused by incorrect reference settings; In practical implementation, the first preset voltage range can be set to the recognition range adapted to a 12V system, and the second preset voltage range can be set to the recognition range adapted to a 24V system, and the two do not overlap; specifically, the first preset voltage range is set to [10.5V, 13.5V], and the second preset voltage range is set to [21.0V, 26.5V]; if the initial input voltage does not fall into either of the above ranges, the system will refuse to start and trigger an abnormal alarm; As one possible implementation, when the initial input voltage falls within the 12V range, the reference voltage is set to 12V; when the initial input voltage falls within the 24V range, the reference voltage is set to 24V. The reference drive current, which is matched with the reference voltage, is given by the parameter set of the corresponding mode. This reference drive current represents the rated drive current required for the light strip to reach the target brightness under the calibration state. For example, it can be the parameter value written into the microcontroller's storage area after factory calibration. Here, the calibration state refers to the state where the input voltage is near the corresponding reference value, the temperature is within the safe operating range, and the light strip has not bent beyond the threshold. The system acquires the real-time input voltage, the highest node temperature, and the maximum strain value, and calculates the deviation of the three types of disturbances based on their respective thresholds to generate voltage deviation, temperature deviation, and strain deviation. The real-time input voltage refers to the current voltage value acquired by the input power monitoring module within the control cycle. The highest node temperature refers to the node value with the highest temperature among multiple temperature acquisition nodes, such as the temperature value corresponding to the area where the local heat dissipation efficiency of the light strip is lower than the preset standard. The maximum strain value refers to the strain value that reflects the greatest degree of bending among multiple strain acquisition nodes, such as the strain value at the stress concentration point of the flexible substrate bending. Traditional solutions often treat voltage, temperature or structural deformation independently, which can easily lead to situations where only voltage is compensated without regard to temperature rise, or only temperature is limited without regard to line stretching, resulting in insufficient sensitivity of adjustment action. This invention unifies three types of disturbances into calculable deviations, enabling subsequent current updates to be based on the same control basis. This transforms the originally dispersed disturbance information into adjustments that can be directly applied to the drive current. The embodiments of this invention can achieve multi-factor coordinated processing based on a unified deviation form, avoiding brightness instability caused by single-factor adjustment. For input-side anchoring, the real-time input voltage is acquired through an input power monitoring module connected in parallel to the power supply input, the temperature value is output through a temperature sensing module, the maximum strain value is output through a strain sensing module, and the actual drive current is obtained through a current sampling module connected in series in the drive circuit. The data acquired by each channel enters the register buffer inside the microcontroller. Voltage and current data are written with the current control cycle value, while temperature and strain data retain the most recent valid value when the sampling frequency is lower than the control cycle. The data written only participates in the calculation within the current control cycle and is overwritten by the new data of the next cycle after participating in the calculation, thus ensuring that the control input corresponds to the drive output. The voltage deviation is generated by subtracting the reference voltage from the real-time input voltage; the temperature deviation is generated by subtracting the preset safe operating temperature threshold from the highest node temperature; and the strain deviation is generated by subtracting the preset strain threshold from the maximum strain value. Among these, the voltage deviation reflects the degree of deviation of the current power supply from the rated voltage of the target power supply mode; the temperature deviation reflects the degree of exceedance of the current light strip from the safe operating temperature boundary; and the strain deviation reflects the degree of exceedance of the current bending degree of the flexible substrate from the allowable deformation threshold. Taking temperature deviation as an example, if the highest node temperature is not higher than the safe operating temperature threshold, it means that the factor has not yet entered the range where derating is required; taking strain deviation as an example, if the maximum strain value is not higher than the strain threshold, it means that the substrate bending has not significantly affected the circuit impedance; the embodiments of the present invention can build a unified current correction basis based on the deviation, avoiding the judgment confusion caused by directly mixing different sensing quantities. Based on voltage deviation, temperature deviation, and strain deviation, the compensation amount is calculated to generate voltage compensation value, temperature compensation value, and strain compensation value. Among them, the calculation of the compensation amount is used to convert the effects of voltage fluctuation, heat accumulation, and mechanical bending on the light strip's illumination state into a correction value that determines whether the driving current should be increased or decreased. The voltage compensation value is used to correct changes in drive margin and circuit loss caused by input voltage variations; the temperature compensation value is used to actively reduce the drive current after the temperature rise exceeds the safety boundary to reduce the thermal load; the strain compensation value is used to compensate for the increase in parasitic resistance of the circuit and the increase in node voltage drop caused by the bending of the flexible substrate. In practical implementation, the voltage compensation value The calculation incorporates the real-time input voltage actually supplied to the LED strip system by the power supply during the current control cycle. The reference voltage serves as the standard for determining the rated voltage corresponding to the current power supply mode. The rated reference drive current required for the LED strip to achieve the target brightness under the corresponding mode and calibrated operating conditions. And a preset voltage compensation coefficient characterizing the influence of input voltage changes on the direction and magnitude of target current correction. The specific calculation method is as follows: ; As an example of possible values The target current can be set to a negative value based on the calibration results, so that the target current can be appropriately reduced when the input voltage increases and appropriately increased when the input voltage decreases. Temperature compensation value A segmented calculation method can be used; when the highest node temperature in the temperature array is used as the representative value of the temperature rise most sensitive to thermal risk... The temperature exceeds the preset safe operating temperature threshold that marks the boundary between allowable normal operation and the point where derating is required. When the current is less than or equal to the preset derating temperature threshold, a preset temperature derating factor is used to characterize the reduction in target current for each unit increase in temperature. Temperature compensation value under this condition The calculation method is as follows: ; If the highest node temperature is not higher than the safe operating temperature threshold, the temperature compensation value is zero. This segmented processing avoids unnecessary derating when the temperature is normal and can also promptly suppress further increases in power consumption when the temperature rises above the safe operating temperature threshold; strain compensation value Threshold-triggered calculation can be used; The maximum strain value at the location where the light strip is most significantly affected by bending during the control cycle. The strain threshold value, which exceeds the preset strain threshold value that may affect the boundary value of the conductive path state when the flexible substrate undergoes normal installation deformation. At the same time, a preset strain compensation coefficient is used in conjunction with the factor characterizing the proportion of the target current compensation amplitude caused by unit over-threshold strain. The strain compensation value under this condition The calculation method is as follows: ; If the maximum strain value is not higher than the strain threshold, the strain compensation value is zero; compensation is only performed when the bending effect is sufficient to cause a change in line voltage drop, so as to avoid over-responding to slight installation deformation. Among them, the preset temperature derating factor and preset strain compensation coefficient The calculations were performed through calibration experiments before the system left the factory. Specifically, under a constant reference power supply, different gradients of temperature load and mechanical bending variables were applied to the LED strip. The drive current correction value required to maintain the calibrated luminous brightness under each condition was recorded, and the relevant values ​​were obtained through linear fitting. and The constant slope is stored in the microcontroller's non-volatile memory for retrieval. Through the above-mentioned compensation calculation, this invention unifies the three types of information into a correction amount for the same target current. It can capture the hidden patterns under complex operating conditions such as voltage drop but temperature rise and strain increase but voltage is normal. It transforms the originally nonlinearly coupled influencing factors into adjustment bases that can be calculated and weighed simultaneously. The embodiments of this invention can achieve fine correction of the target current based on the unified calculation of the compensation amount, avoiding the interference and cancellation of single-channel adjustment by other factors. Furthermore, based on the above embodiments, this embodiment introduces a temperature-strain coupling correction term to address the nonlinear coupling between the three types of compensation values. When the highest node temperature T exceeds the preset safe operating temperature threshold and the maximum strain value Exceeding the preset strain threshold hour, = ,in This is a preset coupling correction coefficient and is positive; it applies when neither temperature nor strain exceeds its corresponding threshold. The current is zero; at this time, the target current is zero. The physical mechanism is as follows: the resistance of the copper foil traces on the flexible substrate increases simultaneously with both temperature (the temperature coefficient of resistance of copper is approximately 0.0039 / ℃) and bending strain (the conductive cross-sectional area decreases after the traces are stretched). Furthermore, the temperature rise further increases the resistance increment caused by strain. When these two factors act together, the total resistance increment of the traces is greater than the sum of the resistance increments generated by their individual effects, exhibiting a multiplicative coupling relationship. If compensation is still performed using a linear superposition method, a systematic undercompensation will occur under the combined condition of simultaneous temperature rise and bending exceeding limits. This manifests as the brightness of the LED strip continuously decreasing as the temperature rise and bending degree both intensify. (Preset coupling correction coefficient) The following were obtained through temperature-strain orthogonal gradient calibration tests before delivery: Under different combinations of temperature gradients and different bending strain gradients, the measured correction amount of the driving current required to maintain the calibrated luminous brightness was recorded, and the linear component was subtracted from this measured correction amount. The slope obtained by performing a regression fit on the product term is... It is then stored in non-volatile memory. In this embodiment of the invention, the systematic undercompensation under combined operating conditions can be incorporated into the closed loop based on the multiplicative coupling correction term, avoiding the persistently low brightness caused by the linear superposition compensation model when both disturbances exceed their limits simultaneously.

[0016] Furthermore, a preset voltage compensation coefficient is used. Preset temperature derating factor Preset strain compensation coefficient and preset coupling correction coefficient These are not a set of constants shared across all modes, but rather pre-stored in the microcontroller's non-volatile memory in groups according to the target power supply mode. They are loaded along with the reference voltage and reference drive current after the target power supply mode is determined. Specifically, in the 12V power supply mode, the operating current of the LED strip circuit is higher, the voltage drop across the flexible substrate traces accounts for a larger proportion of the input voltage, and the influence of voltage fluctuations and bending strain on the light emission state is amplified. Therefore, the first power supply mode corresponds to... , The values ​​are greater than those corresponding to the second power supply mode; the loop current is relatively low under the 24V power supply mode, and the values ​​of each coefficient are reduced accordingly. If the same set of compensation coefficients is used for both voltage systems, there will inevitably be overcompensation under one system and undercompensation under the other. This invention uses a coefficient set that is loaded differently according to the mode to ensure that the same hardware structure obtains compensation gain consistent with the calibration results under both power supply systems. The embodiments of this invention can achieve consistent compensation accuracy under dual voltage systems based on the mode-differentiated coefficient set, avoiding overcompensation or undercompensation caused by the reuse of a single set of coefficients across systems.

[0017] Furthermore, based on the above embodiments, this embodiment also introduces voltage change rate feedforward correction to address rapid fluctuations in the input voltage: calculating the change in the real-time input voltage between adjacent cycles within the k-th control cycle. When the absolute value of this change is equal to the reference voltage When the ratio exceeds the preset voltage change rate threshold, a feedforward correction term is added to the target current. ,in The preset feedforward coefficient has the same sign as the preset voltage compensation coefficient. Consistent; simultaneously, the control cycle is shortened from the first control cycle to the second control cycle until the change falls below the preset voltage change rate threshold, at which point the first control cycle is resumed and the superposition stops. The first control cycle, the second control cycle, and the preset voltage change rate threshold are all loaded along with the target power supply mode. Its physical significance lies in the fact that when the input voltage fluctuates rapidly, the changes in line voltage drop and drive margin appear before slow variables such as temperature and strain. Relying solely on cycle-by-cycle closed-loop feedback will produce perceptible brightness flicker during the transition process. The feedforward correction term provides the correct compensation amount before closed-loop verification, shortening the transition process. This embodiment of the invention can suppress transient brightness flicker caused by rapid power supply fluctuations based on the combination of rate-of-change feedforward and variable-cycle control, avoiding hysteresis and overshoot under rapid disturbances in pure feedback regulation.

[0018] The voltage compensation value, temperature compensation value and strain compensation value are summed and superimposed with the reference drive current to generate the target current. The target current refers to the current command value that the drive module needs to achieve in the current control cycle. Its function is not simply to increase or decrease the brightness, but to enable the light strip to maintain the working state corresponding to the calibrated brightness under the current voltage, temperature and strain conditions. The summation process here is achieved directly through the superposition of various terms, reflecting the combined effect of the three types of compensation factors on the same current target; this invention directly constructs the target current around the reference driving current, so that each compensation falls on a uniform execution amount, which facilitates the subsequent stable tracking of the driving module; The actual drive current is obtained, and the drive control command is corrected based on the absolute value of the difference between the actual drive current and the target current to generate the current drive control command that meets the allowable error requirements. Here, the actual drive current refers to the real current value measured by the current sampling module in the drive circuit; the current deviation refers to the absolute value of the difference between the actual drive current and the target current; the preset allowable error value refers to the current tracking error boundary allowed by the system, which can be set according to a certain proportion of the reference drive current. The calculation in this step is used to ensure that the aforementioned target current is not just a theoretical calculation, but can be actually executed in the drive circuit; the present invention continuously compares the target current with the actual drive current and adjusts the drive control command according to the current deviation to make the output result consistent with the calculation result. As an example of quantitative simulation, assuming the reference drive current under the current 24V power supply mode is set to 50mA, and the comprehensive compensation value calculated during the control cycle due to temperature rise and substrate bending is -2mA, then the target current is updated to 48mA. If the preset allowable error value is set to 1mA, the actual drive current sampled due to power supply disturbance is 52mA, and the system calculates the absolute value of the deviation between the actual and the target current as follows: The allowable error is greater than 1mA; Therefore, the system refuses to lock the current state and instead adjusts the original drive control command by a preset step size, such as gradually reducing the pulse width modulation duty cycle by 2%, and re-checks it in the next cycle until the actual current falls back and stabilizes within the qualified range of 47mA to 49mA before locking the command output. The embodiments of the present invention can reliably implement the target value based on actual current feedback and closed-loop iteration mechanism, avoiding the mismatch phenomenon of only compensation calculation without execution of correction. In terms of output anchoring, after the microcontroller completes the target current calculation, it writes the drive control instruction corresponding to the target current into the instruction buffer within the current control cycle. The drive module reads the current instruction from the instruction buffer and adjusts the actual drive current flowing through the light-emitting diode unit. The current sampling module converts the detected actual drive current into a sampled value that can be read by the microcontroller and writes it back to the sampling register. If the current deviation is greater than the allowable error value, the microcontroller updates the drive control instruction based on the new sampling register content in the next control cycle. If the current deviation is less than or equal to the allowable error value, the current drive control instruction output is maintained. In this way, a complete action loop is formed between the target current, the actual current, and the control command, which is ultimately reflected in the actual change of the conduction degree of the drive module and the actual adjustment of the brightness of the light-emitting diode. Furthermore, based on the above embodiments, a unified control time base can be used for the data acquisition process; a system synchronization clock is established, and the real-time input voltage, highest node temperature, maximum strain value, and actual drive current are time-aligned according to the system synchronization clock, and abnormal data is removed to generate valid data of the same period; wherein, the system synchronization clock refers to the control time base used to unify the time when the sampling values ​​of each channel participate in the calculation, for example, a fixed control period can be used as the synchronization basis; Time alignment refers to organizing data obtained at different sampling frequencies into the same control cycle for calculation. For example, voltage and current data can use the current cycle value, while temperature and strain data can use the most recent valid sample value. Abnormal data refers to data that exceeds the preset physical range, such as data that significantly exceeds the sensor's measurable range or does not conform to actual power supply, current, temperature, and strain conditions. To clarify the judgment criteria, the system configures independent upper and lower limits for the legal physical range of each acquired quantity. For example, the legal range of voltage is set to... The legal temperature range is set to When a sampled value exceeds its corresponding legal physical range, it is judged as abnormal data and discarded directly in this period, and will not participate in subsequent deviation calculations, thus ensuring the reliability of valid data in the same period. This invention avoids mixing and calculating sampled values ​​from different periods and states by using unified time base alignment, thus preventing calculation deviations due to time misalignment. Furthermore, embodiments of this invention can achieve comparability of various input quantities within the same period based on time alignment, avoiding misjudgments caused by asynchronous sampling. If a single data acquisition node used to obtain the highest node temperature or maximum strain value fails to return valid data for a preset number of consecutive times, the data acquisition node is determined to be in a disconnected state. The average value of the data from two normal data acquisition nodes that are physically adjacent to the disconnected data acquisition node is obtained as the substitute data. The preset number of times can be set according to the system sampling period and fault tolerance requirements, for example, it can be matched with the sensor refresh rate. Adjacent nodes refer to the two normal data acquisition nodes that are closest to the disconnected node along the layout direction on the flexible substrate. Furthermore, when the lost node is located at the very beginning or end of the light strip structure, resulting in only one adjacent normal data acquisition node on its physical location, the system's data topology traversal logic will automatically use the data of this single adjacent normal data acquisition node as the replacement data to complete the update; when there are normal data acquisition nodes on both sides, the average value replacement will be performed. If the nodes on one or both sides adjacent to the lost node are also lost, the system's data topology traversal logic will continue to expand the search towards both ends along the deployment direction until the nearest normal data collection node is found, so as to ensure that both nodes participating in the average calculation can provide valid data and improve the accuracy of fault tolerance processing. The physical significance of using this alternative data is that temperature and strain typically change continuously on flexible light strips, and data from adjacent locations have direct reference significance for the location of the loss of connection; This invention limits the impact of local sensor failures on overall control to within the allowable error range by replacing adjacent nodes; embodiments of this invention can continue to estimate lost nodes based on spatial adjacent replacement, avoiding the amplification of local acquisition anomalies into overall control anomalies; Furthermore, based on the above embodiments, the following processing method can be adopted for the limit protection process: determine whether the highest node temperature is greater than the preset limit derating temperature threshold, or determine whether the absolute value of the ratio of voltage deviation to reference voltage is greater than the preset fluctuation limit value. If any condition is met, the target current update is stopped, and the product of the preset low-power protection coefficient and the reference drive current is used as the updated target current to generate the drive control command in the protection state. Among them, the preset limit derating temperature threshold is used to determine whether the system enters the overheat protection state, and the preset fluctuation limit value is used to determine whether the input power supply deviates from the normal operating range. The preset low-power protection coefficient is a coefficient that is greater than zero and less than one, which is used to compress the system output to the safe power consumption range. For example, it can be a value that meets the protection requirements, such as 0.2 or 0.5. This invention directly stops the conventional compensation update after the limit boundary is exceeded, and instead operates with a fixed protection current; it can achieve safe derating under abnormal operating conditions based on the limit protection mechanism, and avoid thermal damage or instability of the device caused by continuous compensation. In the field of flexible lighting control, common evaluation criteria typically include input voltage fluctuation conditions, heat accumulation conditions, and bending installation conditions. If a single adjustment method based solely on pulse width modulation duty cycle is used, when the input voltage drops, the overall luminous intensity at the end of the light strip is prone to falling below the rated value. When the local temperature rises, the system still maintains the original current, which can easily lead to further heat accumulation. When the flexible substrate bends beyond the preset radius of curvature, changes in local circuit impedance can cause a decrease in the luminous brightness of some light-emitting units. In contrast, this embodiment does not separate the three types of problems for processing. Instead, it generates compensation values ​​for each type of problem and applies them uniformly to the target current. When the current deviation exceeds the tolerance, the drive control command is adjusted. Therefore, it is more suitable for dealing with the working requirements of dual-voltage flexible light strips in complex installation environments. In the application example, after the light strip is connected to an external DC power supply, the input power monitoring module reads the initial input voltage at the power supply input terminal, and the microcontroller determines the 12V mode or 24V mode accordingly, and retrieves the corresponding reference voltage and reference drive current from the storage area. After entering normal operation, the input power monitoring module, temperature sensing module, strain sensing module and current sampling module update the sampled values ​​in the registers in their respective sampling cycles; the microcontroller reads the contents of these registers in each control cycle, calculates the deviation of voltage, temperature and strain, forms the target current, and then writes the drive control instruction corresponding to the target current into the instruction buffer of the drive module. The driver module adjusts the output current according to the instruction, so that the LED light-emitting unit actually works in the updated current state. When the ambient temperature rises, the power supply fluctuates, or the state of the light strip changes, the new data continues to flow into the register buffer and triggers the recalculation of the next cycle, thus completing the complete operation process from data entry, parameter update to brightness control action output.

[0019] A light emission brightness control system, comprising: The data acquisition module is used to acquire the initial input voltage to determine the reference voltage and reference drive current, and to acquire the real-time input voltage, the highest node temperature, and the maximum strain value. The parameter calculation module is used to determine the corresponding voltage deviation, temperature deviation, and strain deviation based on the real-time input voltage, the highest node temperature, and the maximum strain value. The current update module is used to calculate the compensation value based on the voltage deviation, temperature deviation and strain deviation, and to obtain the target current by combining it with the reference drive current; The control execution module is used to adjust the drive control command according to the current deviation between the actual drive current and the target current in order to control the drive module; A general-purpose dual-voltage SMD light strip includes: a flexible substrate, light-emitting diode (LED) units disposed on the flexible substrate, and a light emission control system; The data acquisition module includes an input power monitoring module, a temperature sensing module, and a strain sensing module; the control execution module includes a current sampling module. The input power monitoring module is connected in parallel to the power input terminal of the general-purpose dual-voltage SMD LED strip; Temperature sensing modules are arranged in an array with equal spacing along the flexible substrate; The strain sensing module is attached to a pre-set location of bending stress concentration on the flexible substrate; The current sampling module is connected in series in the driving circuit used to drive the light-emitting diode unit; The luminance control system also includes a microcontroller and a current drive module. The microcontroller is connected to the input power monitoring module, temperature sensing module, strain sensing module, current sampling module and current drive module respectively. The current drive module is used as a drive module to adjust the actual drive current flowing through the light-emitting diode unit. In the wiring of the flexible substrate, a constant current diode is connected in series at the location where bending stress is concentrated; Constant current diodes are used for step-down and current-limiting protection when a flexible substrate undergoes mechanical bending, causing the drive circuit to disconnect and fail.

[0020] This invention also provides a luminance control system and a universal dual-voltage SMD LED strip using this system, such as... Figure 2 As shown; the system consists of a data acquisition module, a parameter calculation module, a current update module, and a control execution module, and is controlled by a microcontroller and a current drive module; the current drive module includes a pulse width modulation generation circuit and a buck constant current drive circuit topology based on a metal-oxide-semiconductor switching transistor; The microcontroller controls the on and off times of the metal-oxide-semiconductor switching transistor in the buck constant current drive circuit by adjusting the duty cycle command output to the pulse width modulation generation circuit, thereby achieving smooth adjustment of the actual drive current of the light-emitting diode unit in the main circuit. The light strip includes a flexible substrate, light-emitting diode (LED) units, and the aforementioned control system. The input power monitoring module is connected in parallel to the power input terminal, the temperature sensing module is arranged at equal intervals along the flexible substrate, the strain sensing module is arranged at the preset bending stress concentration position, and the current sampling module is connected in series in the drive circuit. With this structure, the system does not need to add complex dual-channel conversion hardware, and can realize the brightness adjustment in both 12V and 24V power supply modes, while taking into account the impact of temperature rise and bending installation on the operation of the light strip. Based on the above embodiments, the structural cooperation relationship between the system and the light strip is described as follows: the initial input voltage of the input power supply is obtained, and the mode parameters are loaded into the data acquisition module according to the initial input voltage to generate a reference voltage and a reference drive current; wherein, the data acquisition module includes an input power supply monitoring module, a temperature sensing module and a strain sensing module; The input power monitoring module is connected in parallel to the power supply input terminal of the light strip. Its function is to detect the input terminal voltage without affecting the main circuit power supply. The temperature sensing module is arranged in an array at equal intervals along the flexible substrate. Its function is to cover the main heat-generating areas in the length direction of the light strip. The strain sensing module is attached to the preset bending stress concentration position. Its function is to prioritize capturing the bending parts whose deformation affects the circuit conduction state exceeds the preset threshold. The strain sensing module is specifically a flexible thin-film resistive strain gauge, which converts the mechanical deformation of the flexible substrate into a voltage bias signal through a Wheatstone bridge circuit and outputs it to the analog-to-digital converter port of the microcontroller. The microcontroller has a strain-impedance change mapping table pre-stored in it, so that the collected surface strain value is directly converted into the real-time line parasitic resistance increment, which serves as the physical basis for calculating the strain deviation. This invention enables input voltage, thermal state, and structural deformation to be simultaneously processed by the same system through multiple clearly defined acquisition channels; it can achieve synchronous access of multiple state quantities based on a modular acquisition structure, avoiding inaccurate judgments caused by a single information source; The system acquires real-time input voltage, maximum node temperature, and maximum strain value. Based on the reference voltage, safe operating temperature threshold, and strain threshold, it performs deviation calculations on the parameter calculation module to generate voltage deviation, temperature deviation, and strain deviation. The parameter calculation module can be implemented by the software computing unit inside the microcontroller or by computing logic that works in conjunction with the microcontroller. The modules here emphasize functional division, rather than necessarily using independent physical chips; before entering the parameter calculation module, the input voltage, temperature and strain data are first written into the register buffer inside the microcontroller for use in the current control cycle. The data in this buffer exists in numerical form and is retained until the next update after participating in the calculation of this cycle. The present invention sets up a dedicated parameter calculation module so that the original sampled value is first converted into a deviation before participating in subsequent control, which can avoid the fluctuation amplification caused by the original sensor value directly acting on the drive. The parameter calculation module can realize a stable conversion from sampled value to control basis, and avoid the original data noise directly entering the drive action. The current update module performs compensation calculations based on voltage deviation, temperature deviation, and strain deviation to generate the target current. The function of the current update module is to uniformly convert deviation information from different sources into a correction amount for the reference drive current. This module reads the deviation data written by the parameter calculation module inside the microcontroller, and completes the calculation of voltage compensation value, temperature compensation value and strain compensation value within the same control cycle, and then sums them to obtain the target current; the target current here is not an abstract output value, but directly corresponds to the current setting value that the current drive module should achieve. This invention reduces command conflicts by unifying the target current output and superimposing all correction quantities under the same coordinate. It can achieve unified convergence of multi-factor correction results based on the current update module, avoiding control coupling interference between multiple channels. The actual driving current is obtained, and the control execution module is updated according to the comparison result between the target current and the actual driving current. The drive control command is generated and output to the drive module. The control execution module includes a current sampling module, which is connected in series in the drive circuit for driving the light-emitting diode unit. Its physical function is to directly detect the actual driving current flowing through the light-emitting diode unit. After reading the sampled value provided by the sampling module, the microcontroller calculates the absolute value of the difference between the actual drive current and the target current, and determines whether it is less than or equal to the preset allowable error value. If the condition is met, the current drive control command is maintained or output; if the condition is not met, the drive control command is updated and the actual drive current is rechecked. This invention continuously verifies the driving results through the control execution module, ensuring that the current setting truly reflects the actual changes in the circuit. It can effectively realize the transition from the target current to the actual output current based on the control execution module, avoiding steady-state errors between theoretical settings and physical outputs. Based on the above embodiments, the structural layout of the general-purpose dual-voltage SMD light strip can be described as follows: Obtain the mounting area on the flexible substrate, and arrange the temperature sensing module, strain sensing module and light-emitting diode unit according to the heat distribution and bending distribution to generate a light strip structure suitable for dual-voltage input. Among them, the flexible substrate refers to a carrier substrate that can be bent, and the light-emitting diode light-emitting unit is set on the flexible substrate to form the light-emitting part of the light strip; the temperature sensing module is arranged in an array at equal intervals along the flexible substrate, the purpose of which is to form temperature sampling coverage in the length direction of the light strip. The strain sensor module is attached to the preset bending stress concentration position to prioritize the reflection of the tensile or bending effects that may occur at installation corners, folds, and other locations; the input power monitoring module is connected in parallel to the power input terminal to directly reflect the fluctuation state of the external power supply; the current sampling module is connected in series in the drive circuit to directly reflect the current operating current of the LED light-emitting unit. This invention integrates the acquisition unit directly into the structure of the light strip body, so that the control basis is generated on the controlled object itself; the state acquisition and drive control can be closely arranged based on the integrated light strip structure. In practical implementation, the microcontroller is connected to the input power monitoring module, temperature sensing module, strain sensing module, current sampling module, and current driving module respectively. The function of the microcontroller is to uniformly read various sampled values, complete deviation calculation and compensation operation, and convert the calculation results into drive control commands. As a driving module, the current driving module adjusts the actual driving current flowing through the light-emitting diode unit according to the driving control command. The connection here can be an electrical connection or a signal connection. Its essence is to enable the sampled information to enter the microcontroller and enable the control command to enter the current driving module. To ensure clear data flow, each sampling module first writes the sampling results into a sampling register that can be read by the microcontroller. After the microcontroller completes the calculation, it writes the drive control instructions into the instruction register or instruction buffer of the drive module, which then reads them and applies them to the drive loop. During this process, both the sampling values ​​and control instructions are updated according to the control cycle. Old data is overwritten by new data when the new cycle arrives, and does not occupy storage space for a long time. Based on the above embodiments, the working mechanism of the constant current diode can be explained as follows: obtain the bending stress concentration location of the flexible substrate, and according to the failure risk of the drive circuit, connect the constant current diode in series with the wiring line at the location to generate a step-down current limiting protection path under mechanical abnormality; The constant current diode is placed in the wiring of the flexible substrate. Its function is not to participate in the conventional brightness adjustment, but to limit the current as a pure hardware protection element when the flexible substrate is mechanically bent and the drive circuit is disconnected and fails. Specifically, the drive circuit disconnection failure here refers to the failure of the weak current control signal line due to physical damage such as excessive bending of the flexible substrate and cracking of the trace, which causes the control circuit to be unable to output drive commands to the main circuit in the normal way. For example, the failure of the pulse width modulation control trace can cause the metal oxide semiconductor switch in the main light-emitting circuit to be abnormally fully turned on due to gate suspension, thereby causing the main power supply circuit to overcurrent and short circuit. In this extremely dangerous operating condition where the control signal fails to disconnect and the main power supply circuit remains conductive, the software closed-loop control is completely ineffective due to the loss of the feedback link; the present invention pre-connects constant current diodes in series at the bending stress concentration points of the main power supply circuit that are prone to deformation. When the above-mentioned control circuit is broken, causing the main circuit to be abnormally fully turned on, the constant current diode relies on its own electrical characteristics as a hardware protection element to automatically limit the abnormally increased surge current to its rated constant current value, such as within 20mA, and undertake the role of voltage division and voltage reduction, providing a voltage reduction and current limiting protection method, thereby effectively reducing the risk of the light-emitting diode unit being damaged by abnormal overcurrent impact. This invention can achieve pure hardware-based isolation protection under soft control circuit failure based on constant current diodes, avoiding abnormal surges in main light-emitting current after control link failure; In the field of dual-voltage flexible LED strips, conventional products mostly use a fixed circuit structure with a simple dimmer. Although the structure is simplified, it is not adaptable to input fluctuations, heat accumulation and bending stress. Especially in scenarios with bending installation, enclosed cavity lighting or obvious power fluctuations, relying on a single dimming method can easily lead to local dark spots, overall brightness drift and concentrated heat generation. In contrast, this embodiment simultaneously deploys an input power monitoring module, a temperature sensing module, a strain sensing module, and a current sampling module within the light strip body. The target current is calculated uniformly by a microcontroller and then executed by the current driving module. Therefore, it is more suitable for use under flexible installation and dual-voltage compatibility conditions. In the application example, after the general-purpose dual-voltage SMD LED strip is installed and connected to a DC power supply, the input power monitoring module obtains the initial input voltage from the power supply input terminal, and the microcontroller determines the reference voltage and the reference drive current accordingly. During operation, the temperature sensing module continuously updates the temperature at each sampling point, the strain sensing module continuously updates the strain at the bending position, and the current sampling module continuously updates the actual current of the drive circuit. After the above sampling data is written into the sampling register inside the microcontroller, the parameter calculation module and the current update module read and complete the deviation calculation and target current calculation in sequence within the control cycle. After the calculation is completed, the microcontroller writes the drive control instruction into the instruction buffer of the current drive module, and the current drive module adjusts the actual drive current flowing through the light-emitting diode unit accordingly. When the temperature exceeds the limit derating temperature threshold, or the input voltage deviates from the reference voltage by more than the allowable boundary, the microcontroller stops the regular target current update and instead outputs the drive control command in protection mode. When mechanical bending further causes abnormalities in the drive circuit, the constant current diode connected in series at the location of stress concentration during bending provides step-down current limiting protection. Thus, the light strip can be adjusted from normal brightness to abnormal protection within the same structure.

[0021] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. 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 be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for controlling luminous intensity, applied to a luminous intensity control system comprising a light strip and a driving module, characterized in that, Includes the following steps: The initial input voltage of the input power supply is obtained, the target power supply mode is determined from the preset power supply modes, and the voltage and current corresponding to the target power supply mode are used as the reference voltage and the reference drive current, respectively. The real-time input voltage of the input power supply, the highest node temperature of the lamp strip, and the maximum strain value of the lamp strip are obtained respectively. Combined with the reference voltage, the preset safe operating temperature threshold, and the preset strain threshold, the corresponding voltage deviation, temperature deviation, and strain deviation are determined respectively. The compensation value is determined based on the voltage deviation, the temperature deviation, and the strain deviation, and the target current is generated by combining the reference drive current with the compensation value. The actual drive current is obtained, and the drive control command is adjusted and output to the drive module according to the current deviation between the actual drive current and the target current, until the current deviation is less than or equal to the preset allowable error value.

2. The luminance control method according to claim 1, characterized in that, The process for determining the target power supply mode is as follows: If the initial input voltage is within the first preset voltage range, then the first power supply mode is determined to be the target power supply mode, and the reference voltage is set to 12V; If the initial input voltage is within the second preset voltage range, then the second power supply mode is determined to be the target power supply mode, and the reference voltage is set to 24V; wherein the first preset voltage range and the second preset voltage range do not overlap.

3. The luminance control method according to claim 1, characterized in that, The compensation values ​​include voltage compensation values, temperature compensation values, and strain compensation values, which are determined as follows: The voltage compensation value is determined based on the voltage deviation, the preset voltage compensation coefficient, and the proportional relationship between the reference voltage and the reference drive current. When the highest node temperature exceeds the preset safe operating temperature threshold but does not exceed the preset limit derating temperature threshold, the temperature compensation value is determined to be negative based on the temperature deviation and the preset temperature derating coefficient. When the maximum strain value exceeds the preset strain threshold, the strain compensation value is determined to be a positive value based on the strain deviation and the preset strain compensation coefficient; When the highest node temperature is not higher than the preset safe operating temperature threshold, the temperature compensation value is zero; when the maximum strain value is not higher than the preset strain threshold, the strain compensation value is zero.

4. The luminance control method according to claim 1, characterized in that, The process of obtaining the real-time input voltage, the highest node temperature, and the maximum strain value also includes: Establish a system synchronization clock, and based on the synchronization clock, time-align the acquired real-time input voltage, highest node temperature, maximum strain value and actual drive current, and remove abnormal data that exceed the preset physical range. If a single data acquisition node used to obtain the highest node temperature or maximum strain value fails to return valid data for a preset number of consecutive times, the data acquisition node is determined to be in a disconnected state, and the average value of the data from two normal data acquisition nodes that are physically adjacent to the disconnected data acquisition node is obtained as substitute data.

5. The luminance control method according to claim 1, characterized in that, It also includes the limit protection process: If the highest node temperature is greater than the preset derating temperature threshold, or the absolute value of the ratio of the voltage deviation to the reference voltage is greater than the preset fluctuation limit, then the update of the target current is stopped, and the product of the preset low-power protection coefficient and the reference drive current is directly output as the updated target current, wherein the preset low-power protection coefficient is greater than zero and less than one.

6. A luminance control system, employing the luminance control method according to any one of claims 1-5, characterized in that, include: The data acquisition module is used to acquire the initial input voltage to determine the reference voltage and reference drive current, and to acquire the real-time input voltage, the highest node temperature, and the maximum strain value. The parameter calculation module is used to determine the corresponding voltage deviation, temperature deviation, and strain deviation based on the real-time input voltage, the highest node temperature, and the maximum strain value. The current update module is used to calculate the compensation value based on the voltage deviation, the temperature deviation and the strain deviation, and to obtain the target current by combining the reference drive current; The control execution module is used to adjust the drive control command according to the current deviation between the actual drive current and the target current, so as to control the drive module.

7. A universal dual-voltage SMD LED strip, characterized in that, include: A flexible substrate, a light-emitting diode (LED) unit disposed on the flexible substrate, and a light-emitting brightness control system according to claim 6; The data acquisition module includes an input power monitoring module, a temperature sensing module, and a strain sensing module; the control execution module includes a current sampling module. The input power monitoring module is connected in parallel to the power input terminal of the universal dual-voltage SMD light strip; The temperature sensing modules are arranged in an array with equal spacing along the flexible substrate; The strain sensing module is attached to a predetermined bending stress concentration position on the flexible substrate. The current sampling module is connected in series in the driving circuit used to drive the light-emitting diode unit; The light emission control system further includes a microcontroller and a current driving module. The microcontroller is connected to the input power monitoring module, the temperature sensing module, the strain sensing module, the current sampling module, and the current driving module. The current driving module serves as the driving module and is used to adjust the actual driving current flowing through the light-emitting diode unit.

8. A universal dual-voltage SMD LED strip according to claim 7, characterized in that, In the wiring of the flexible substrate, a constant current diode is connected in series at the location where the bending stress is concentrated. The constant current diode is used to provide voltage reduction and current limiting protection when the flexible substrate undergoes mechanical bending, causing the drive circuit to fail and disconnect.

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