Heat Dissipation Control Method, System, Medium and Device for LED Lighting Equipment

Abstract

A heat dissipation control method, system, medium and device for an LED lighting device, which relates to the technical field of LED lighting control. The method includes: obtaining the temperatures of each LED lamp string on the substrate, and determining the overheated LED lamp strings according to the temperatures of each LED lamp string; determining an initial compensation lamp string of the overheated LED lamp strings in the LED array; calculating a first duty cycle of the overheated LED lamp strings according to the temperatures of the overheated LED lamp strings; after controlling the overheated LED lamp strings to operate according to the first duty cycle, obtaining the brightness values of the overheated LED lamp strings, and determining a target compensation lamp string from the initial compensation lamp strings based on the brightness values; determining a second duty cycle of the target compensation lamp string, and controlling the target compensation lamp string to operate according to the second duty cycle. Implementing the technical solution provided by this application can achieve heat dissipation of the LED light-emitting unit while ensuring the illumination of the entire lighting device.

Description

Technical Field

[0001] The present application relates to the technical field of LED lighting control, and particularly relates to a heat dissipation control method, system, medium and device for an LED lighting device. Background Art

[0002] Lighting devices are one of the indispensable infrastructures in modern life. In recent years, due to the advantages of small size, low energy consumption, long service life, etc. of LEDs (light emitting diodes), LED lighting devices have gradually replaced traditional lighting devices and have been widely used in multiple fields such as household lighting, commercial lighting, and industrial lighting.

[0003] Since an LED is a semiconductor, when electric energy is applied to the LED as a semiconductor, light and heat are generated due to different electron levels. In this case, the light energy accounts for about 15% of the total energy, and the remaining energy generates heat energy, thus generating heat. When a high-power LED lighting device is in use, due to poor heat dissipation, the device temperature will be too high, affecting the luminous life of the LED. The prior art mainly dissipates heat from the lighting device by reducing the power of the overheated LED lamp or directly turning off the overheated LED lamp, etc. This heat dissipation method affects the overall illumination of the lighting device. Summary of the Invention

[0004] The present application provides a heat dissipation control method, system, medium and device for an LED lighting device, which can maximize the heat dissipation of the LED light-emitting unit while ensuring the illumination of the entire lighting device.

[0005] In a first aspect, the present application provides a heat dissipation control method for an LED lighting device, which is applied to an LED lighting device. The LED lighting device includes an LED array, and the LED array is composed of a plurality of LED lamp strings arranged side by side on a substrate. The method includes:

[0006] Obtain the temperatures of each LED lamp string on the substrate, and determine the overheated LED lamp string according to the temperatures of each LED lamp string;

[0007] Determine the initial compensation lamp string of the overheated LED lamp string in the LED array;

[0008] Calculate the first duty cycle of the overheated LED lamp string according to the temperature of the overheated LED lamp string;

[0009] After controlling the overheated LED lamp string to operate according to the first duty cycle, obtain the brightness value of the overheated LED lamp string, and determine the target compensation lamp string from the initial compensation lamp strings based on the brightness value;

[0010] Determine the second duty cycle of the target compensation lamp string, and control the target compensation lamp string to operate according to the second duty cycle.

[0011] By adopting the above technical solution, the overheated LED string is determined by monitoring the temperature of each LED string on the substrate, realizing the timely positioning of the overheated string. By reasonably selecting the initial compensation string, the temperature difference between arrays can be utilized to the maximum extent for heat dissipation. Calculating the first duty ratio according to the temperature of the overheated LED string can accurately control the power of the overheated string and effectively dissipate heat from it. After controlling the overheated LED string to operate according to the first duty ratio, its brightness value is detected and the target compensation string is selected from the initial compensation strings to achieve the brightness compensation of the overheated LED string by the target compensation string, while maximizing the heat dissipation of the LED light-emitting unit and ensuring the illumination of the entire lighting device.

[0012] Optionally, determining the overheated LED string according to the temperature of each LED string includes:

[0013] Judging whether the temperatures of all the LED strings are all lower than the first preset temperature;

[0014] If the temperature of one LED string exceeds the first preset temperature, the LED string whose temperature exceeds the first preset temperature is used as the overheated LED string;

[0015] If the temperatures of all the LED strings are all lower than the first preset temperature, control the LED array to operate in a preset normal mode.

[0016] By adopting the above technical solution, by monitoring the temperature of each LED string and comparing it with a preset temperature threshold, when the temperature of an LED string is higher than the preset threshold, it can be determined that the string is an overheated string, realizing the positioning of the overheating problem. When the temperatures of all the strings are below the threshold, it can be judged that the array is normal and controlled to operate in the normal mode, realizing the effective monitoring of the overheating problem of the LED array.

[0017] Optionally, determining the initial compensation string of the overheated LED string in the LED array includes: judging whether there is a relevant LED string with a temperature lower than the first preset temperature within the preset range of the overheated LED string in the LED array;

[0018] If there is a relevant LED string with a temperature lower than the first preset temperature, the relevant string is used as the initial compensation string;

[0019] If there is no relevant LED string with a temperature lower than the first preset temperature, select a low-temperature LED string with a temperature lower than the second preset temperature in the LED array as the initial compensation string.

[0020] By adopting the above technical solution, first determine whether there is a relatively cool associated lamp string within the preset range of the overheated LED lamp string. If there is, directly determine it as the initial compensation lamp string, so that the surrounding lamp strings can be utilized for light compensation to the greatest extent. If there is no lamp string with a temperature meeting the requirements within the preset range, then expand the range to select a lamp string with a relatively low temperature within the entire array as the initial compensation lamp string. This two-stage temperature determination realizes the effective selection of the compensation lamp string and improves the heat dissipation efficiency.

[0021] Optionally, calculating the first duty cycle of the overheated LED lamp string according to the temperature of the overheated LED lamp string includes:

[0022] Obtain the ambient temperature of the current environment where the LED lighting device is located;

[0023] Substitute the ambient temperature and the temperature of the overheated LED lamp string into the first duty cycle calculation formula to obtain the first duty cycle of the overheated LED lamp string;

[0024] The first duty cycle calculation formula is: In the formula, D is the first duty cycle, D min is the minimum duty cycle at the maximum temperature, D max is the maximum duty cycle at the ideal temperature, K is the temperature sensitivity coefficient, T a is the temperature of the overheated LED lamp string, T b is the ambient temperature, T max is the maximum safe operating temperature, and α is the ambient temperature adjustment coefficient.

[0025] By adopting the above technical solution, this calculation formula fully considers the ambient temperature and the actual temperature of the overheated LED lamp string. Through the adjustment of parameters such as the temperature sensitivity coefficient and the ambient temperature adjustment coefficient, the first duty cycle of the overheated LED lamp string can be accurately calculated, so as to implement precise power control on it and achieve effective heat dissipation.

[0026] Optionally, determining the target compensation lamp string among the initial compensation lamp strings based on the brightness value includes: when there are two or more initial compensation lamp strings, determine the lowest compensation brightness value based on the brightness value, and determine the target compensation lamp string among the initial compensation lamp strings according to the lowest compensation brightness;

[0027] When there is only one initial compensation lamp string, then use the initial compensation lamp string as the target compensation lamp string.

[0028] By adopting the above technical solution, according to the actual brightness of the overheated lamp string, the compensation lamp string is dynamically selected to achieve precise compensation of the brightness. When there are multiple initial compensation lamp strings, the compensation scheme with the lowest compensation cost can be selected to minimize the compensation energy. When there is only one initial compensation lamp string, it can also be directly used for compensation to achieve precise compensation.

[0029] Optionally, determining the target compensation lamp string from the initial compensation lamp strings according to the lowest compensation brightness includes:

[0030] Determining the first lamp string with the lowest temperature in the initial compensation lamp strings, and judging whether the temperature of the first lamp string exceeds a first preset temperature after compensating according to the lowest compensation brightness;

[0031] If the temperature of the first lamp string does not exceed the first preset temperature after compensating according to the lowest compensation brightness, then use the first lamp string as the target compensation lamp string;

[0032] If the temperature of the first lamp string exceeds the first preset temperature after compensating according to the lowest compensation brightness, then continue to execute the step of determining the first lamp string with the lowest temperature in the initial compensation lamp strings to obtain the second lamp string, and use the first lamp string and the second lamp string as the target compensation lamp strings.

[0033] By adopting the above technical solution, first select the lamp string with the lowest temperature in the initial compensation lamp strings, and judge whether it is overheated at the lowest compensation brightness. If it is not overheated, it is directly determined as the target compensation lamp string, and the lamp string with the smallest temperature can be used for compensation to maximize the temperature difference heat dissipation effect. If it is overheated, then continue to select the second lowest temperature lamp string and combine it with the first lamp string as the target compensation lamp string to expand the compensation range, realizing precise brightness compensation under controlled temperature and effectively compensating the brightness on the premise of ensuring safety.

[0034] Optionally, determining the second duty ratio of the target compensation lamp string includes:

[0035] If the number of the target compensation lamp strings is greater than or equal to two, then calculate the temperature ratio of each target compensation lamp string, and determine the second duty ratio of each target compensation lamp string according to the temperature ratio;

[0036] If the number of the target compensation lamp strings is one, then set the second duty ratio of the target compensation lamp string as the preset maximum duty ratio.

[0037] By adopting the above technical solution, when there are more than one target compensation lamp strings, calculate the second duty ratio according to the temperature ratio of each lamp string, so that the duty ratio can be accurately allocated according to the temperature condition to achieve precise brightness compensation. When there is only one target compensation lamp string, its duty ratio is directly set to the maximum to exert the maximum brightness compensation effect.

[0038] In a second aspect of the present application, a heat dissipation control system for an LED lighting device is provided, which is applied to the LED lighting device. The LED lighting device includes an LED array, and the LED array is composed of a plurality of LED lamp strings arranged side by side on a substrate. The system includes:

[0039] An overheated lamp string determination module, configured to obtain the temperatures of the LED lamp strings on the substrate and determine the overheated LED lamp strings according to the temperatures of the LED lamp strings;

[0040] An initial compensation lamp string determination module, configured to determine an initial compensation lamp string for the overheated LED lamp string in the LED array; a first duty ratio determination module, configured to calculate a first duty ratio of the overheated LED lamp string according to the temperature of the overheated LED lamp string;

[0041] A target compensation lamp string determination module, configured to obtain a brightness value of the overheated LED lamp string after controlling the overheated LED lamp string to operate according to the first duty ratio, and determine a target compensation lamp string from the initial compensation lamp strings based on the brightness value;

[0042] A second duty ratio determination module, configured to determine a second duty ratio of the target compensation lamp string and control the target compensation lamp string to operate according to the second duty ratio.

[0043] In a third aspect of the present application, a computer storage medium is provided. The computer storage medium stores multiple instructions, and the instructions are adapted to be loaded and executed by a processor to perform the above method steps.

[0044] In a fourth aspect of the present application, an electronic device is provided, including: a processor and a memory; wherein, the memory stores a computer program, and the computer program is adapted to be loaded and executed by the processor to perform the above method steps.

[0045] In summary, one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0046] In the present application, the overheated LED lamp strings are determined by monitoring the temperatures of the LED lamp strings on the substrate, realizing the timely positioning of the overheated lamp strings. Reasonably selecting the initial compensation lamp strings can maximize the use of the temperature difference between the arrays for heat dissipation. Calculating the first duty ratio according to the temperature of the overheated LED lamp string can accurately control the power of the overheated lamp string and effectively dissipate heat from it. After controlling the overheated LED lamp string to operate according to the first duty ratio, detecting its brightness value and screening out the target compensation lamp string from the initial compensation lamp strings to achieve the brightness compensation of the target compensation lamp string for the overheated LED lamp string, while minimizing the heat generation of the LED light-emitting unit and maintaining the illumination of the entire lighting device. Description of the Drawings

[0047] Figure 1 It is a schematic flow chart of a heat dissipation control method for an LED lighting device provided by an embodiment of the present application;

[0048] Figure 2 It is a schematic module diagram of a heat dissipation control system for an LED lighting device provided by an embodiment of the present application;

[0049] Figure 3 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

[0050] Explanation of reference numerals: 300, electronic device; 301, processor; 302, communication bus; 303, user interface; 304, network interface; 305, memory. Detailed implementation manners

[0051] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0052] In the description of the embodiments of the present application, words such as "for example" or "for illustration" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "for example" or "for illustration" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "for example" or "for illustration" is intended to present relevant concepts in a specific manner.

[0053] In the description of the embodiments of the present application, the meaning of the term "a plurality" refers to two or more. For example, a plurality of systems refers to two or more systems, and a plurality of screen terminals refers to two or more screen terminals. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the technical features indicated. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0055] The embodiments of the present application can be applied to various lighting scenarios that require high-power LEDs as light sources. For example, high-power LEDs in industrial lighting have advantages such as high brightness and long lifespan, and are very suitable for lighting industrial environments such as factory workshops and docks. However, the industrial environment usually has a relatively high ambient temperature and high humidity, making it more difficult for LEDs to dissipate heat. Or in stadium lighting, large-power LED floodlights are required in stadiums, ball fields, etc. to provide high-intensity lighting. Due to long-term operation, LED floodlights are extremely likely to generate a large amount of heat. By using the technical solutions provided by the embodiments of the present application, the heat generation of the LED light-emitting unit can be minimized while ensuring the overall illumination of the lighting device.

[0056] The embodiments of the present application are applied to a lighting device, which may include: an LED array, a temperature sensor, and a control unit. The LED array is composed of multiple LED lamp strings arranged side by side on a substrate. These LED lamp strings are connected in parallel and arranged on the substrate. Each lamp string is formed by connecting several LED chips in series. When powered on, the LED chips emit light to form a lighting source. The temperature sensor is used to measure the real-time emission temperature of each LED chip that makes up each LED lamp string. Temperature is a key parameter reflecting the heat generation situation of the LED. The control unit is electrically connected to the temperature sensor and the LED array. The control unit is configured with an operation model and a control algorithm, and can obtain the temperature values of the LED chips measured by the temperature sensor, and dynamically adjust the duty cycle when supplying power to the corresponding LED lamp string according to these temperature values.

[0057] Please refer to Figure 1 , a schematic flowchart of a heat dissipation control method for an LED lighting device is proposed. This method can be implemented depending on a computer program, can be implemented depending on a single-chip microcomputer, or can run on a heat dissipation control system of an LED lighting device. This computer program can be integrated in a controller or can run as an independent tool application. Specifically, this method includes steps 10 to 50, and the above steps are as follows:

[0058] Step 10: Obtain the temperatures of each LED lamp string on the substrate, and determine the overheated LED lamp strings according to the temperatures of each LED lamp string.

[0059] In the embodiments of the present application, an overheated LED lamp string refers to that in the LED array, some LED lamp strings, due to reasons such as long-term operation or too high ambient temperature, cause the temperature of the LED chips that make up the LED lamp string to exceed the preset safe temperature threshold and be in an "overheated" state.

[0060] Specifically, as a semiconductor device, an LED generates heat during operation. If the heat cannot be dissipated in time, it will cause the temperature of the LED chip to be too high, shortening the service life of the LED, reducing the luminous efficiency, and even damaging the LED severely. Multiple temperature sensors are built into the lighting device to measure the real-time temperature of each LED chip that makes up each LED string. Through the connection with the temperature sensors, the control unit can continuously obtain the latest temperature data of each LED string in the entire LED array. The control unit will compare the obtained temperature values of each LED string with a preset first preset temperature threshold. If it is found that the temperature of some LED strings exceeds the first preset temperature threshold, these LED strings will be determined as overheated LED strings. The setting of the first preset temperature threshold needs to be determined comprehensively according to the specific model of the LED chip and the use environment, usually with reference to the highest operating temperature of the LED chip.

[0061] Based on the above embodiments, as an optional embodiment, the step of determining the overheated LED strings according to the temperature of each LED string may further include the following steps:

[0062] Step 101: Determine whether the temperature of each LED string is lower than the first preset temperature.

[0063] Specifically, the control unit first obtains the real-time temperature values of all LED strings in the entire LED array from the temperature sensors, and then compares these temperature values with the first preset temperature threshold to determine whether the temperature of all LED strings is lower than the first preset temperature threshold.

[0064] The first preset temperature threshold is the temperature threshold for determining whether an LED string belongs to an overheated LED string. When the actual operating temperature of the LED string exceeds this threshold, it is regarded as overheated and heat dissipation measures need to be taken for it. Different models of LED chips have their own upper limits of the highest operating temperature. Exceeding this temperature may cause the luminous efficiency to decrease or even damage the chip. Therefore, the first preset temperature usually cannot be higher than this highest temperature specification value. If the ambient temperature of the use environment is very high, such as in industrial environments, outdoors, etc., in order to reserve enough temperature rise space, the first preset temperature threshold needs to be appropriately lowered and can be adjusted according to the actual situation.

[0065] Step 102: If the temperature of one LED string exceeds the first preset temperature, the LED string with the temperature exceeding the first preset temperature is used as an overheated LED string.

[0066] Specifically, if there is an LED string whose temperature exceeds the first preset temperature, the control unit will identify those LED strings with temperatures exceeding the first preset temperature threshold as overheated LED strings, and record information such as their numbers and temperature values. At the same time, the control unit will also confirm that other LED strings with temperatures below the threshold are non-overheated strings.

[0067] Step 103: If the temperatures of all LED strings are lower than the first preset temperature, control the LED array to operate in a preset normal mode.

[0068] Specifically, after determining that the temperatures of all LED strings are lower than the first preset temperature, it indicates that the current operating state of the LED array is normal, the temperature of the LED chips is within a safe range, there is no overheating risk, and there is no need to adjust the power supply working state of the LED array, that is, there is no need to execute subsequent heat control measures. The control unit will maintain the current power supply state of the LED array unchanged, that is, keep the preset working parameters such as the supply voltage and duty cycle, so that the LED array can continuously emit light and supply power according to the preset normal mode.

[0069] Step 20: Determine the initial compensation strings for the overheated LED strings in the LED array.

[0070] The initial compensation strings refer to several LED strings preselected by the control unit from the remaining non-overheated LED strings after determining that there are overheated LED strings for compensation purposes.

[0071] Specifically, the control unit obtains the latest temperature data of all non-overheated LED strings, and then selects several LED strings with lower temperature values from these temperature data and determines them as the initial compensation strings, and the number of them is usually not less than the number of overheated strings. When selecting the initial compensation strings, those LED strings with lower temperature and less heat generation will be given priority because they have greater potential to increase the brightness output. At the same time, the number of compensation strings can also be determined comprehensively according to factors such as the actual overheating situation and the expected compensation effect. Determining the initial compensation strings in advance will greatly increase the control time delay compared with temporarily designating compensation strings during the implementation of heat control, which may cause a sudden drop in the lighting output before the heat control takes effect and affect the lighting effect.

[0072] Based on the above embodiments, as an alternative embodiment, the step of determining the initial compensation strings for the overheated LED strings in the LED array may further include the following steps:

[0073] Step 201: Determine whether there are relevant LED strings with temperatures lower than the first preset temperature within the preset range of the overheated LED strings in the LED array.

[0074] Specifically, the control unit sets a preset range for each overheated LED string, which usually includes several other LED strings adjacent to the position of the overheated string. The specific boundaries of the preset range can be determined according to factors such as the layout structure of the LED array and the thermal model. Obtain the current temperature values of all LED strings within these preset ranges and compare them with the first preset temperature threshold to determine whether there are related strings with temperatures lower than the first preset temperature. This preliminary screening is to determine whether there are non-overheated LED strings around the overheated LED string to serve as potential compensation targets.

[0075] Step 202: If there are related LED strings with temperatures lower than the first preset temperature, then regard the related strings as initial compensation strings.

[0076] Specifically, after the control unit determines that there are related LED strings with temperatures lower than the first preset temperature within the preset range of the overheated LED string, it will automatically record these related LED strings as the initial compensation strings for the overheated string and store their relevant information such as numbers and temperatures. It should be noted that the control unit does not assign the same initial compensation strings to all overheated strings, but will judge and assign the corresponding initial compensation strings for each overheated string separately, so as to achieve truly accurate one-to-one local compensation.

[0077] Step 203: If there are no related LED strings with temperatures lower than the first preset temperature, then select low-temperature LED strings with temperatures lower than the second preset temperature in the LED array as initial compensation strings.

[0078] Specifically, if there are no available related LED strings with temperatures lower than the first preset temperature threshold within the preset range of the overheated LED string, then it is necessary to find other low-temperature LED strings with temperatures lower than the second preset temperature threshold in the entire LED array and regard them as the initial compensation strings for the overheated string. The control unit sets a second preset temperature threshold, which is lower than the first preset temperature, to define a lower temperature range. Then obtain the real-time temperature data of all LED strings in the entire LED array, screen out those low-temperature LED strings with temperatures lower than the second preset temperature threshold, and regard all the low-temperature strings as the initial compensation strings.

[0079] Step 30: Calculate the first duty cycle of the overheated LED string according to the temperature of the overheated LED string.

[0080] The duty cycle refers to the ratio of the time when a pulse signal is in an effective state (usually referred to as high level) within a period to the time of that period. In the embodiments of this application, the first duty cycle means that for overheated LED light strings, the control unit will control to reduce their duty cycles, that is, shorten their conduction time within each PWM period, thereby reducing their brightness output and further reducing the heat generation.

[0081] Specifically, when the control unit confirms that some LED light strings are in an overheated state, it will not simply reduce their duty cycles uniformly to a certain fixed value, but will calculate the corresponding first duty cycle for each overheated LED light string according to its specific temperature.

[0082] Obtain the ambient temperature of the current environment where the LED lighting device is located through a temperature sensor. Then, substitute this ambient temperature value and the temperature values of each overheated LED light string itself into the first duty cycle calculation formula for operation to obtain the first duty cycle corresponding to each overheated LED light string.

[0083] The first duty cycle calculation formula is: In the formula, D is the first duty cycle, D min is the minimum duty cycle at the maximum temperature, D max is the maximum duty cycle at the ideal temperature, K is the temperature sensitivity coefficient, T a is the temperature of the overheated LED light string, T b is the ambient temperature, T max is the maximum safe operating temperature, and α is the ambient temperature adjustment coefficient.

[0084] The main component in this first duty cycle calculation formula is the temperature influence function This temperature influence function is a non-linear function that adjusts the duty cycle according to temperature changes. Among them, e is the base of the natural logarithm, which is used to create a smooth adjustment process. k is the temperature sensitivity coefficient, which is used to adjust the sensitivity and response speed of temperature changes to the duty cycle. The larger the k value, the more sensitive the temperature is to the duty cycle. The power exponent α is the ambient temperature adjustment coefficient. When the α value changes, the response curve can be steeper or flatter, which affects the adaptation speed of the lighting device to temperature changes. This temperature scale factor represents the ratio of the difference between the actual temperature and the reference temperature to the total temperature difference from the reference temperature to the maximum temperature, connecting the actual ambient temperature with the temperature limit designed for the device, so that the adjustment of the duty cycle can more accurately reflect the actual working environment conditions.

[0085] By combining the temperature influence function with D max and D minMultiply the difference values to dynamically adjust the duty cycle. This ensures that when the temperature rises, the duty cycle can be reduced to protect the device, and when the temperature drops, the duty cycle can be increased to provide better performance or brightness.

[0086] In summary, by finely controlling the electrical performance of the device to adapt to changes in ambient temperature, the formula combines the maximum and minimum duty cycle limits, an exponential temperature response function, and a non-linear adjustment to temperature changes, achieving the optimization and protection of the device's performance under different environmental conditions. In practical applications, such as LED lighting systems, this control mechanism enables the device to operate at a higher duty cycle in a colder environment to achieve higher brightness and efficiency. When the temperature rises, the duty cycle automatically decreases, thereby reducing power consumption and heat generation, effectively preventing LED damage or shortened lifespan caused by overheating. This dynamic adjustment not only protects the device and extends its service life but also ensures that the device maintains its optimal operating performance under different environmental conditions.

[0087] Step 40: After controlling the overheated LED string to operate at the first duty cycle, obtain the brightness value of the overheated LED string, and determine the target compensation string from the initial compensation strings based on the brightness value.

[0088] Specifically, after the overheated string operates at the first duty cycle, there may be a certain difference between its actual brightness value and the calculated value. Compensating directly based on the calculated value may affect the compensation effect. Only by obtaining the real brightness data can the brightness gap to be compensated be accurately evaluated. When determining the target compensation string based on the actual brightness value of the overheated LED string, the number of initial compensation strings will be judged first, and different determination methods will be adopted according to different situations. If the number of initial compensation strings is greater than or equal to 2, the lowest compensation brightness will be determined according to the brightness value of the overheated LED string, and then at least one LED string that can provide this lowest brightness increment will be selected from the initial compensation strings as the target compensation string; but if there is only 1 initial compensation string, then this initial compensation string will be directly used as the target compensation string. That is, when the compensation resources are sufficient, the compensation strategy will be allocated as needed among multiple strings to avoid over-dimming of some strings; when the compensation resources are scarce, the limited resources will also be fully utilized for compensation to achieve the maximum possible brightness compensation under the existing conditions and alleviate the impact of dimming the overheated string as much as possible.

[0089] Based on the above embodiments, as an alternative embodiment, the step of determining the target compensation string from the initial compensation strings based on the brightness value may further include the following steps:

[0090] Step 401: When the number of initial compensation strings is greater than or equal to two, determine the lowest compensation brightness value based on the brightness value, and determine the target compensation string from the initial compensation strings according to the lowest compensation brightness.

[0091] Specifically, when the number of initial compensation lamp strings is greater than or equal to two, not all of these initial compensation lamp strings are directly used as target compensation lamp strings. First, the control unit calculates the brightness difference based on the difference between the actual brightness value of the overheated lamp string measured previously and the reference brightness value under its normal duty cycle. This brightness difference is the minimum compensation brightness value that needs to be compensated currently.

[0092] Among the initial compensation lamp strings, the first lamp string with the lowest current temperature is selected. Based on the temperature of this first lamp string and the minimum compensation brightness, it is brought into a preset heating simulation model. This preset heating simulation model can be a simplified thermoelectric simulation or a more refined finite element numerical simulation, depending on the computing power level of the control unit. The output of the model is the estimated steady-state temperature value of the first lamp string after compensation, that is, the temperature reached when the brightness of the first lamp string is increased by the minimum compensation brightness on the basis of the current brightness. It is judged whether this temperature exceeds the first preset temperature, that is, the overheating temperature threshold. If the temperature of the first lamp string after being compensated according to the minimum compensation brightness does not exceed the first preset temperature, it means that the brightness compensation of the overheated LED lamp string can be achieved through this single first lamp string, and the first lamp string is used as the target compensation lamp string.

[0093] If the temperature of the first lamp string after being compensated according to the minimum compensation brightness exceeds the first preset temperature, it means that compensation cannot be achieved only by this single first lamp string, which will cause the first lamp string to also overheat. Then other compensation lamp strings need to be added. Then continue to execute the step of determining the first lamp string with the lowest temperature among the initial compensation lamp strings, that is, continue to select the LED lamp string with the second lowest current temperature among the initial compensation lamp strings, denoted as the second lamp string, and then perform the same temperature simulation calculation again. If the temperatures of both the first lamp string and the second lamp string do not exceed the first preset temperature after being compensated according to the minimum compensation brightness value, the first lamp string and the second lamp string are used as the target compensation lamp strings. It should be noted that if the first lamp string and the second lamp string still cannot meet the compensation requirements, the lamp string with the third lowest temperature will still be used as the second lamp string until the overall temperature meets the preset requirements after compensation, that is, until the compensation of the overheated LED lamp string is completed. Ensure that after the target compensation lamp string performs compensation, its temperature distribution is still within the reliable operating range, avoiding the risk of light efficiency decline or device loss caused by too high temperature. At the same time, multiple compensation lamp strings generate heat more evenly than a single lamp string, and the heat generation area will be concentrated in the area with relatively lower temperature, which is conducive to the rapid diffusion of heat and avoids the accumulation of hot spots.

[0094] Step 402: When the number of initial compensation lamp strings is one, the initial compensation lamp string is used as the target compensation lamp string.

[0095] Specifically, when determining the target compensation light string, not only the heat generation and compensation effect need to be considered, but also the situation of available compensation resources needs to be evaluated. When the number of initial compensation light strings is only one, multi-light string combination and heat dispersion cannot be carried out anymore, and only this single LED light string can be directly used as the target compensation light string. That is, when the control unit determines that the number of initial compensation light strings is 1, the previous multi-light string screening and evaluation process will no longer be carried out, but this LED light string will be directly determined as the target compensation light string.

[0096] In another feasible embodiment, when the number of initial compensation light strings is only one, there may be a relatively large number of overheated LED light strings, and the overall overheating condition of the lighting device may be relatively serious. Therefore, it is necessary to detect the number of overheated LED light strings. When the number of overheated LED light strings exceeds the threshold, each overheated LED light string needs to be operated according to the corresponding first duty cycle, and at this time, no compensation adjustment is performed to ensure the safe operation of the lighting device.

[0097] Step 50: Determine the second duty cycle of the target compensation light string and control the target compensation light string to operate according to the second duty cycle.

[0098] The second duty cycle refers to the new duty cycle value to which the control unit adjusts the duty cycle of the target compensation light string when performing brightness compensation.

[0099] After determining one or more target compensation light strings, the control unit needs to scientifically set their second duty cycles to achieve both filling the brightness gap and not causing a new overheating risk. For different situations of the number of target compensation light strings, the specific methods for determining the second duty cycle will also be different.

[0100] Specifically, if the number of target compensation light strings is greater than or equal to two, the control unit obtains the current temperature values of each target compensation light string, compares these temperature values pairwise, and obtains a temperature ratio sequence. For example, there are three target compensation light strings A, B, and C with temperatures of 50°C, 60°C, and 55°C respectively. Since the temperature of the A light string at 50°C is the lowest, it is used as the reference. Then the temperature ratio of the B light string to A is 60°C / 50°C = 1.2, and the ratio of the C light string to A is 55°C / 50°C = 1.1. According to these ratio results, different degrees of second duty cycle increments are assigned to each light string.

[0101] For example, a mapping function can be preset as: the second duty cycle increment = the maximum increment percentage * (2 - the temperature ratio). Then, for string B, the temperature ratio is 60 / 50 = 1.2. According to the above formula, its second duty cycle increment = 25% * (2 - 1.2) = 20%. At this time, the second duty cycle of string B is the initial 40% + 20% = 60%. By analogy, the second duty cycle of string C can be calculated as 62.5%, and the second duty cycle of string A is 65%. The lower the temperature of the string, the greater the duty cycle increment, so that its heat generation increases faster; on the contrary, the higher the temperature, the smaller the duty cycle increment, to avoid further exacerbating its overheating.

[0102] For example, in the above example, string A with the lowest temperature can be allocated the largest duty cycle increment, such as increasing by 25%; string B with a higher temperature has a smaller duty cycle increment, such as increasing by 20%; since the temperature of string C is in the middle position, its duty cycle increment is between the two, such as 22%. The method of dynamically allocating the duty cycle increment according to the temperature ratio can fully consider the current temperature status of each string, enabling the lower-temperature ones to undertake more compensation tasks and the higher-temperature ones to stop appropriately, which ensures that the overall heat generation will not get out of control and the temperature difference between the strings will not deteriorate further.

[0103] If there is only one target compensation string, in order to maximize its compensation ability at this time, the control unit will directly set its second duty cycle to the preset maximum safe duty cycle, such as about 80%.

[0104] Please refer to Figure 2 Figure [ID], which is a schematic diagram of the modules of a heat dissipation control system for an LED lighting device provided by an embodiment of the present application. The heat dissipation control system of the LED lighting device may include: an overheated string determination module, an initial compensation string determination module, a first duty cycle determination module, a target compensation string determination module, and a second duty cycle determination module, where:

[0105] The overheated string determination module is configured to obtain the temperatures of the LED strings on the substrate and determine the overheated LED strings according to the temperatures of the LED strings.

[0106] The initial compensation string determination module is configured to determine the initial compensation string of the overheated LED string in the LED array.

[0107] The first duty cycle determination module is configured to calculate the first duty cycle of the overheated LED string according to the temperature of the overheated LED string.

[0108] The target compensation string determination module is configured to obtain the brightness value of the overheated LED string after controlling the overheated LED string to operate according to the first duty cycle, and determine the target compensation string in the initial compensation strings based on the brightness value.

[0109] The second duty cycle determination module determines the second duty cycle of the target compensation LED string and controls the target compensation LED string to operate according to the second duty cycle.

[0110] Optionally, the overheated LED string determination module is further configured to determine whether the temperatures of all the LED strings are all lower than a first preset temperature; if the temperature of one LED string exceeds the first preset temperature, the LED string with the temperature exceeding the first preset temperature is used as the overheated LED string; if the temperatures of all the LED strings are all lower than the first preset temperature, the LED array is controlled to operate in a preset normal mode.

[0111] Optionally, the initial compensation LED string determination module is further configured to determine whether there are relevant LED strings with temperatures lower than the first preset temperature within a preset range of the overheated LED string in the LED array; if there are relevant LED strings with temperatures lower than the first preset temperature, the relevant LED strings are used as the initial compensation LED strings; if there are no relevant LED strings with temperatures lower than the first preset temperature, low-temperature LED strings with temperatures lower than a second preset temperature are selected in the LED array as the initial compensation LED strings.

[0112] Optionally, the first duty cycle determination module is further configured to obtain the ambient temperature of the current environment where the LED lighting device is located; substitute the ambient temperature and the temperature of the overheated LED string into a first duty cycle calculation formula to obtain the first duty cycle of the overheated LED string; the first duty cycle calculation formula is: In the formula, D is the first duty cycle, D min is the minimum duty cycle at the maximum temperature, D max is the maximum duty cycle at the ideal temperature, K is the temperature sensitivity coefficient, T a is the temperature of the overheated LED string, T b is the ambient temperature, T max is the maximum safe operating temperature, and α is the ambient temperature adjustment coefficient.

[0113] Optionally, when the number of the initial compensation LED strings is greater than or equal to two, the target compensation LED string determination module is further configured to determine the lowest compensation brightness value based on the brightness values, and determine the target compensation LED string from the initial compensation LED strings according to the lowest compensation brightness; when the number of the initial compensation LED strings is one, the initial compensation LED string is used as the target compensation LED string.

[0114] Optionally, the target compensation light string determination module is further configured to determine the first light string with the lowest temperature in the initial compensation light strings, and determine whether the temperature of the first light string exceeds a first preset temperature after compensating according to the lowest compensation brightness; if the temperature of the first light string does not exceed the first preset temperature after compensating according to the lowest compensation brightness, then use the first light string as the target compensation light string; if the temperature of the first light string exceeds the first preset temperature after compensating according to the lowest compensation brightness, then continue to execute the step of determining the first light string with the lowest temperature in the initial compensation light strings to obtain a second light string, and use the first light string and the second light string as the target compensation light strings.

[0115] Optionally, when the number of target compensation light strings is greater than or equal to two, the second duty ratio determination module is further configured to calculate the temperature ratios of the target compensation light strings, and determine the second duty ratios corresponding to the target compensation light strings according to the temperature ratios; when the number of target compensation light strings is one, then determine the second duty ratio of the target compensation light string as a preset maximum duty ratio.

[0116] It should be noted that when the system provided in the above embodiments realizes its functions, only the division of the above function modules is used for illustration. In actual applications, the above functions can be allocated to different function modules according to needs, that is, the internal structure of the device is divided into different function modules to complete all or part of the functions described above. In addition, the system and method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process can be seen in the method embodiments, which will not be repeated here.

[0117] The embodiment of the present application further provides a computer storage medium, which can store multiple instructions. The instructions are suitable for being loaded and executed by a processor to execute the heat dissipation control method of an LED lighting device in the above embodiments. The specific execution process can refer to the specific description in the above embodiments and will not be repeated here.

[0118] Please refer to Figure 3 The present application also discloses an electronic device. Figure 3 FIG. is a schematic structural diagram of an electronic device disclosed in an embodiment of the present application. The electronic device 300 may include: at least one processor 301, at least one network interface 304, a user interface 303, a memory 305, and at least one communication bus 302.

[0119] Among them, the communication bus 302 is used to realize the connection and communication between these components.

[0120] Among them, the user interface 303 may include a display screen (Display) and a camera (Camera). Optionally, the user interface 303 may further include a standard wired interface and a wireless interface.

[0121] Among them, the network interface 304 may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface).

[0122] Among them, the processor 301 may include one or more processing cores. The processor 301 connects various parts within the entire server using various interfaces and lines. By running or executing instructions, programs, code sets, or instruction sets stored in the memory 305, and by calling the data stored in the memory 305, it executes various functions of the server and processes data. Optionally, the processor 301 may be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), or programmable logic array (PLA). The processor 301 may integrate a combination of one or several of a central processing unit (CPU), a graphics processing unit (GPU), and a modem, etc. Among them, the CPU mainly processes the operating system, user interface, and application programs, etc.; the GPU is responsible for rendering and drawing the content to be displayed on the display screen; the modem is used to process wireless communication. It can be understood that the above-mentioned modem may not be integrated into the processor 301 and may be implemented separately by a single chip.

[0123] Among them, the memory 305 may include random access memory (RAM) and may also include read-only memory. Optionally, the memory 305 includes a non-transitory computer-readable storage medium. The memory 305 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 305 may include a program storage area and a data storage area. Among them, the program storage area may store instructions for implementing the operating system, instructions for at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc.; the data storage area may store the data involved in the above-mentioned various method embodiments. The memory 305 is optionally also at least one storage device located far from the aforementioned processor 301. Refer to Figure 3 , as a computer storage medium, the memory 305 may include an operating system, a network communication module, a user interface module, and an application program for a heat dissipation control method of an LED lighting device.

[0124] In Figure 3 In the electronic device 300 shown, the user interface 303 is mainly used to provide an interface for user input and obtain data input by the user; and the processor 301 can be used to call an application program stored in the memory 305 that stores a heat dissipation control method for an LED lighting device. When executed by one or more processors 301, the electronic device 300 is caused to execute one or more of the methods as described in the foregoing embodiments. It should be noted that, for the foregoing method embodiments, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be adopted in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0125] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0126] In several implementation manners provided by this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some service interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical or other form.

[0127] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0128] In addition, the functional units in each embodiment of this application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0129] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a memory and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present application. The aforementioned memory includes various media that can store program codes, such as USB flash drives, mobile hard disks, magnetic disks, or optical discs.

[0130] The above are only exemplary embodiments of the present disclosure, and the scope of the present disclosure cannot be limited thereby. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. After considering the specification and the disclosure of the practical truth, those skilled in the art will easily think of other implementation manners of the present disclosure.

[0131] The present application aims to cover any variations, uses, or adaptive changes of the present disclosure. These variations, uses, or adaptive changes follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not recorded in the present disclosure. The specification and the embodiments are only regarded as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A heat dissipation control method for LED lighting equipment, characterized in that: Applied to an LED lighting device, the LED lighting device includes an LED array, the LED array is composed of a plurality of LED light strings arranged side by side on a substrate, the method includes: Acquire the temperature of each LED light string on the substrate, and determine the overheated LED light string according to the temperature of each LED light string; Determining an initial compensation lamp string of the overheated LED lamp string in the LED array; Obtaining the ambient temperature of the environment in which the LED lighting device is currently located; Substituting the ambient temperature and the temperature of the overheated LED light string into a first duty cycle calculation formula to obtain a first duty cycle of the overheated LED light string; The first duty cycle calculation formula is: Where D is the first duty cycle, D min is the minimum duty cycle at maximum temperature, D max is the maximum duty cycle at ideal temperature, K is the temperature sensitivity coefficient, T a is the temperature of the overheated LED string, T b is the ambient temperature, T max is the maximum safe operating temperature, α is the ambient temperature adjustment coefficient; After controlling the overheated LED light string to operate according to the first duty cycle, obtaining a brightness value of the overheated LED light string, and determining a target compensation light string in the initial compensation light string based on the brightness value; A second duty cycle of the target compensation light string is determined, and the target compensation light string is controlled to operate according to the second duty cycle.

2. The heat dissipation control method of LED lighting equipment according to claim 1, characterized in that: The step of determining an overheated LED light string according to the temperature of each of the LED light strings comprises: Determining whether the temperatures of all the LED light strings are lower than a first preset temperature; If there is an LED light string whose temperature exceeds the first preset temperature, the LED light string exceeding the first preset temperature is regarded as an overheated LED light string; If the temperatures of all the LED light strings are lower than the first preset temperature, the LED array is controlled to operate in a preset normal mode.

3. The heat dissipation control method of LED lighting equipment according to claim 1, characterized in that: The step of determining an initial compensation lamp string of the overheated LED lamp string in the LED array comprises: Determining in the LED array whether there is a related LED light string with a temperature lower than a first preset temperature within a preset range of the overheated LED light string; If there is a related LED light string whose temperature is lower than the first preset temperature, the related light string is used as an initial compensation light string; If there is no relevant LED light string with a temperature lower than the first preset temperature, a low-temperature LED light string with a temperature lower than the second preset temperature is selected in the LED array as an initial compensation light string.

4. The heat dissipation control method of LED lighting equipment according to claim 1, characterized in that: The determining a target compensating light string in the initial compensating light string based on the brightness value comprises: When there are more than or equal to two initial compensation light strings, determining a minimum compensation brightness value based on the brightness value, and determining a target compensation light string from the initial compensation light strings according to the minimum compensation brightness; When there is one initial compensation light string, the initial compensation light string is used as the target compensation light string.

5. The heat dissipation control method of LED lighting equipment according to claim 4, characterized in that: The step of determining a target compensating light string from the initial compensating light strings according to the minimum compensating brightness comprises: Determine a first lamp string with the lowest temperature in the initial compensation lamp strings, and determine whether the temperature of the first lamp string after compensation according to the lowest compensation brightness exceeds a first preset temperature; If the temperature of the first light string after compensation according to the minimum compensation brightness does not exceed a first preset temperature, taking the first light string as a target compensation light string; If the temperature of the first light string after compensation according to the minimum compensation brightness exceeds the first preset temperature, continue to execute the step of determining the first light string with the lowest temperature in the initial compensation light strings, obtain at least one second light string, and use the first light string and the second light string as target compensation light strings.

6. The heat dissipation control method of LED lighting equipment according to claim 1, characterized in that: The step of determining the second duty cycle of the target compensation light string comprises: If there are more than or equal to two target compensation light strings, then calculating the temperature ratio of each target compensation light string, and determining the second duty cycle corresponding to each target compensation light string according to the temperature ratio; If there is one target compensation light string, the second duty cycle of the target compensation light string will be determined to be a preset maximum duty cycle.

7. A heat dissipation control system for LED lighting equipment, characterized in that: Applied to LED lighting equipment, the LED lighting equipment includes an LED array, the LED array is composed of a plurality of LED light strings arranged side by side on a substrate, the system includes: An overheated light string determination module, used to obtain the temperature of each LED light string on the substrate, and determine the overheated LED light string according to the temperature of each LED light string; An initial compensation lamp string determination module, used to determine an initial compensation lamp string of the overheated LED lamp string in the LED array; The first duty cycle determination module is used to obtain the ambient temperature of the current environment of the LED lighting device; substitute the ambient temperature and the temperature of the overheated LED light string into the first duty cycle calculation formula to obtain the first duty cycle of the overheated LED light string; the first duty cycle calculation formula is: Where D is the first duty cycle, D min is the minimum duty cycle at maximum temperature, D max is the maximum duty cycle at ideal temperature, K is the temperature sensitivity coefficient, T a is the temperature of the overheated LED string, T b is the ambient temperature, T max is the maximum safe operating temperature, α is the ambient temperature adjustment coefficient; a target compensation light string determination module, configured to obtain a brightness value of the overheated LED light string after controlling the overheated LED light string to operate according to a first duty cycle, and determine a target compensation light string in the initial compensation light string based on the brightness value; The second duty cycle determination module determines a second duty cycle of the target compensation light string, and controls the target compensation light string to operate according to the second duty cycle.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the method according to any one of claims 1 to 6.

9. An electronic device, characterized in that: It includes a processor, a memory, a user interface and a network interface, the memory is used to store instructions, the user interface and the network interface are used to communicate with other devices, and the processor is used to execute the instructions stored in the memory so that the electronic device executes the method as described in any one of claims 1-6.

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