LED light decay compensation method based on pulse driving and intelligent range hood

Abstract

The invention relates to an LED lamp light decay compensation method based on pulse driving and an intelligent range hood. The method comprises the following steps: acquiring a pulse detection signal output by a photoelectric detection module under test light of an LED lamp; the test light is generated by controlling the LED lamp through a pulse driving signal; calculating a response delay index based on the pulse detection signal and the pulse driving signal; and compensating the original driving current of the LED lamp based on the response delay index to obtain a new driving current, thereby solving the problem of poor reliability of LED attenuation compensation, and using the time response characteristic of the signal as the basis for judging the LED attenuation state, not only realizing adaptive compensation, but also improving the accuracy and reliability of LED light attenuation compensation.

Description

Technical Field

[0001] This application relates to the field of intelligent control technology, and in particular to a pulse-driven LED light decay compensation method and an intelligent range hood. Background Technology

[0002] In LED lighting applications, LED devices inevitably experience light decay over time, meaning their luminous efficiency gradually decreases. Light decay not only affects the brightness output of the lighting system but can also lead to color shifts, impacting the user experience.

[0003] In existing technologies, fixed compensation curves are often used for brightness compensation. However, different usage methods can affect the decay rate and degree of LEDs. Fixed compensation curves are difficult to accurately adapt to the actual decay state of LEDs, which can easily lead to insufficient or excessive compensation and make it impossible to achieve fine control.

[0004] There is currently no effective solution to the problem of poor reliability of LED attenuation compensation in related technologies. Summary of the Invention

[0005] This embodiment provides a pulse-driven LED light decay compensation method and an intelligent range hood to solve the problem of poor reliability of LED decay compensation in related technologies.

[0006] In a first aspect, this embodiment provides a pulse-driven LED light decay compensation method, the method comprising:

[0007] The pulse detection signal output by the photoelectric detection module under the test light of the LED lamp is acquired; the test light is generated by the LED lamp controlled by the pulse drive signal.

[0008] Calculate the response delay index based on the pulse detection signal and the pulse drive signal;

[0009] Based on the response delay index, the original driving current of the LED is compensated to obtain a new driving current; the new driving current is used to control the LED for normal lighting.

[0010] In some embodiments, a response delay metric is calculated based on the pulse detection signal and the pulse drive signal, including:

[0011] Obtain the start time of the rising edge of the pulse in the pulse drive signal;

[0012] The detection time when the pulse reaches a preset intensity is extracted from the pulse detection signal; based on the difference between the start time and the detection time, the response delay index of the LED light is calculated.

[0013] In some of these embodiments, the preset intensity is set to 0.5 times the peak value.

[0014] In some embodiments, based on the response delay metric, the original drive current of the LED is compensated to obtain a new drive current, including:

[0015] Based on the response delay index and the preset reference delay index, the attenuation index is calculated;

[0016] Based on the attenuation index, the corresponding compensation coefficient is obtained;

[0017] Based on the attenuation index and the compensation coefficient, the original driving current of the LED lamp is compensated to obtain a new driving current.

[0018] In some embodiments, an attenuation index is calculated based on the response delay index and a preset reference delay index, including:

[0019] Obtain a preset compensation trigger threshold and determine whether the response delay index is greater than the compensation trigger threshold;

[0020] If the response delay index is greater than the compensation trigger threshold, then the attenuation index is calculated based on the response delay index and the preset reference delay index.

[0021] In some embodiments, the method further includes: calculating the remaining lifetime of the carriers of the LED lamp based on the response delay metric.

[0022] In some embodiments, the LED light includes at least two color temperature channels; when the pulse detection signal is acquired, each color temperature channel is driven in a time-division manner to control each color temperature channel to emit the test light independently.

[0023] Secondly, this embodiment provides an intelligent range hood, including: an intelligent control module and an LED light and a photoelectric detection module connected to the intelligent control module;

[0024] The intelligent control module is used to implement the steps of the method described in any one of the first aspects;

[0025] The LED light is used for illumination;

[0026] The photoelectric detection module is used to detect the test light of the LED lamp to generate a pulse detection signal.

[0027] In some embodiments, a fan drive module is also included;

[0028] The fan drive module is connected to the intelligent control module;

[0029] The intelligent control module is used to control the fan drive module to enter noise reduction mode when it acquires the pulse detection signal output by the photoelectric detection module under the illumination of the LED light.

[0030] Thirdly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any one of the first aspects.

[0031] Compared with related technologies, the LED light decay compensation method and intelligent range hood based on pulse driving provided in this embodiment obtains the pulse detection signal output by the photoelectric detection module under the test light of the LED lamp; the test light is generated by the LED lamp controlled by the pulse driving signal; based on the pulse detection signal and the pulse driving signal, the response delay index is calculated; based on the response delay index, the original driving current of the LED lamp is compensated to obtain a new driving current, which solves the problem of poor reliability of LED decay compensation. By using the time response characteristics of the signal as the basis for judging the LED decay state, it not only realizes adaptive compensation, but also improves the accuracy and reliability of LED light decay compensation.

[0032] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0034] Figure 1 This is a hardware structure block diagram of the terminal of the LED light decay compensation method based on pulse driving in the embodiments of this application;

[0035] Figure 2 This is a flowchart illustrating the LED light decay compensation method based on pulse driving in the embodiments of this application;

[0036] Figure 3 This is a schematic diagram of the pulse drive signal and pulse detection signal in an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the structure of the intelligent range hood in the embodiments of this application;

[0038] Figure 5 This is a schematic diagram showing the relative positions of the smart range hood, stove, cooking appliances, and LED lights after installation in a preferred embodiment of this application.

[0039] Figure 6 This is a flowchart illustrating the automatic detection and compensation process of the intelligent range hood after it is turned on, as shown in this preferred embodiment.

[0040] Figure 7 This is a structural block diagram of the LED light decay compensation device based on pulse driving in the embodiments of this application.

[0041] Reference numerals: 102, processor; 104, memory; 106, transmission device; 108, input / output device; 71, signal acquisition module; 72, delay calculation module; 73, lighting compensation module. Detailed Implementation

[0042] To better understand the purpose, technical solution, and advantages of this application, the application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0043] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these” used in this application do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or modules (units) is not limited to the listed steps or modules (units) but may include steps or modules (units) not listed, or may include other steps or modules (units) inherent to these processes, methods, products, or devices. Words such as “connected,” “linked,” and “coupled” used in this application are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. Normally, the character " / " indicates that the objects before and after it are in an "or" relationship. The terms "first," "second," "third," etc., used in this application are merely to distinguish similar objects and do not represent a specific order of objects.

[0044] The method embodiments provided in this example can be executed on a terminal, computer, or similar computing device. For example, it can run on a terminal. Figure 1 This is a hardware structure block diagram of the terminal of the LED light decay compensation method based on pulse driving in this embodiment. (See diagram below.) Figure 1 As shown, a terminal may include one or more ( Figure 1Only one is shown in the diagram. A processor 102 and a memory 104 for storing data are also included. The processor 102 may be, but is not limited to, a microprocessor (MCU) or a programmable logic device (FPGA). The terminal may also include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that… Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the terminal described above. For example, the terminal may also include components that are larger than... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown are illustrated.

[0045] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the pulse-driven LED light decay compensation method in this embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0046] The transmission device 106 is used to receive or send data via a network. This network includes a wireless network provided by the terminal's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 can be a Radio Frequency (RF) module used for wireless communication with the Internet.

[0047] This embodiment provides a method for compensating for LED light decay based on pulse driving. Figure 2 This is a flowchart of the LED light decay compensation method based on pulse driving in this embodiment, as shown below. Figure 2 As shown, the process includes the following steps:

[0048] Step S210: Obtain the pulse detection signal output by the photoelectric detection module under the test light of the LED lamp; the test light is generated by the LED lamp controlled by the pulse drive signal.

[0049] Specifically, the pulse drive signal uses a narrow pulse at the microsecond level to avoid the influence of oil stain changes, for example, a pulse with a pulse width of 0.1μs, a peak current of 5A, and a period of 1ms. The pulse drive signal controls the LED to emit test light, and the photoelectric detection module outputs a pulse detection signal under the illumination of the LED's test light. The photoelectric detection module includes a photodetector; it also includes a signal conditioning circuit, an amplifier, and a comparator, used to amplify, filter, and convert the light signal collected by the photodetector into a square wave to output the pulse detection signal. The photodetector is installed at a certain distance from the LED, such as 10cm or 15cm.

[0050] Step S220: Calculate the response delay index based on the pulse detection signal and the pulse drive signal.

[0051] Specifically, based on the rising or falling edge times of the pulses in the pulse detection signal and the pulse drive signal, the delay difference between the two is calculated to obtain the response delay index. In other embodiments, the pulse width modulation (PWM) duty cycle phase method can also be used. Specifically, the PWM duty cycle D of the pulse drive signal is measured; the PWM duty cycle D′ of the pulse detection signal is measured; and the response delay index is output according to the formula Δt=|DD′| / f (f is the PWM frequency).

[0052] Step S230: Based on the response delay index, the original driving current of the LED lamp is compensated to obtain a new driving current; the new driving current is used to control the LED lamp for normal lighting.

[0053] Specifically, based on the response delay index, the compensation coefficient is updated; based on the response delay index and the compensation coefficient, a target compensation value is calculated; based on the target compensation value, the original driving current of the LED lamp is compensated to obtain a new driving current. The new driving current can improve the abnormal light emission caused by light decay, so as to drive the LED lamp to emit light normally during illumination. In addition, a detection cycle is preset. When the detection cycle arrives, the above steps S210 to S230 are executed to obtain and use the updated new driving current. The original driving current can be the driving current set when the LED lamp leaves the factory, which can drive the LED lamp to provide normal illumination when the LED lamp has not experienced light decay.

[0054] The pulse-driven LED light decay compensation method described in this embodiment can be used in smart home appliances, such as range hoods, dishwashers, and refrigerators, to provide users with a better lighting experience. In this embodiment, the pulse detection signal output by the photoelectric detection module under the test light of the LED is acquired; the test light is generated by the LED controlled by the pulse drive signal; based on the pulse detection signal and the pulse drive signal, the response delay index is calculated; based on the response delay index, the original drive current of the LED is compensated to obtain a new drive current. This solves the problem of poor reliability in LED decay compensation. By using the time response characteristics of the signal as the basis for judging the LED decay state, adaptive compensation is not only achieved, but the accuracy and reliability of LED light decay compensation are further improved.

[0055] In some embodiments, the response delay metric is calculated based on the pulse detection signal and the pulse drive signal, see [link to relevant documentation]. Figure 3 ,include:

[0056] Step S221: Obtain the start time t0 of the rising edge of the pulse in the pulse drive signal.

[0057] Step S222: Extract the detection time t when the pulse reaches the preset intensity from the pulse detection signal. r Based on the difference between the start time and the detection time, the response delay index Δt=t of the LED light is calculated. r -t0.

[0058] Specifically, the preset intensity can be set between 50% and 100% of the peak value according to the actual usage. Preferably, the preset intensity is set to 0.5 times the peak value to avoid misjudgment caused by circuit noise or weak light emission and to improve the robustness of the test.

[0059] In this embodiment, a quantifiable index is used to describe the LED response delay, which is determined by the time from the rising edge of the pulse drive signal (t0) to the time it takes for the LED to actually emit light to reach the preset intensity (t). r The difference between the two values ​​can be used to quickly evaluate LED performance.

[0060] In some embodiments, the original drive current of the LED is compensated based on the response delay metric to obtain a new drive current, including:

[0061] Step S231: Calculate the attenuation index β based on the response delay index Δt and the preset reference delay index Δt0. Specifically, the formula for calculating the attenuation index β is as follows:

[0062] .

[0063] Step S232: Based on the attenuation index β, obtain the corresponding compensation coefficient α. Specifically, the compensation coefficient α can be segmented according to the attenuation index β, as shown in Table 1 below:

[0064] Table 1

[0065]

[0066] Step S233: Based on the attenuation index β and the compensation coefficient α, compensate the original driving current I0 of the LED lamp to obtain the new driving current I. new .

[0067] Specifically, the new drive current I new The calculation formula is as follows:

[0068] .

[0069] In this embodiment, precise compensation is achieved through attenuation index β and compensation coefficient α, avoiding blindly increasing the current. α can be automatically adjusted based on the severity of attenuation, thus enhancing the compensation effect.

[0070] In some embodiments, an attenuation metric is calculated based on a response latency metric and a preset reference latency metric, including:

[0071] Step S231-a: Obtain the preset compensation trigger threshold and determine whether the response delay index is greater than the compensation trigger threshold.

[0072] For example, the compensation trigger threshold can be set to 120ns. For LEDs with multiple color temperature channels, the response delay index Δt of each color temperature channel is detected, and the original drive current of color temperature channels with a delay greater than 120ns is compensated.

[0073] In step S231-b, if the response delay index is greater than the compensation trigger threshold, the attenuation index is calculated based on the response delay index and the preset reference delay index; if the response delay index is less than or equal to the compensation trigger threshold, the new drive current calculated in the previous detection cycle is obtained, and the original parameters in the previous detection cycle are maintained to avoid repeated calculations and reduce power consumption.

[0074] In some embodiments, the remaining lifetime τ of the LED lamp carriers is also calculated based on the response delay index Δt.

[0075] Specifically, LED light emission originates from the radiative recombination of electron-hole pairs, and the recombination process conforms to the following formula:

[0076] ;

[0077] Here, n represents the carrier concentration, and τ represents the remaining carrier lifetime. The survival time of electron-hole pairs from generation to recombination, i.e., the remaining carrier lifetime τ, can also reflect the decay rate of semiconductor materials. Response delay index test data and corresponding remaining carrier lifetime data are obtained through experimental testing. Based on the formula Δt=k×τ+g, the relationship between the response delay index Δt and the remaining carrier lifetime τ is fitted, and the device coefficients k and g are calibrated. When detecting the decay of an LED lamp, the remaining carrier lifetime τ of the LED lamp can be estimated from the current response delay index Δt.

[0078] The remaining lifetime of charge carriers, τ, can be used to predict the lifespan of LEDs, providing early warnings for severely aged LEDs (τ exceeding the maintenance threshold) or specific color temperature channels within an LED, prompting replacement. The remaining lifetime of charge carriers, τ, can also assess the LED's response speed limit; that is, τ can be used to determine the LED's theoretical minimum response time. For example, if τ = 50 ns, the LED cannot stably respond to pulse signals shorter than 50 ns, which can be used as a reference for adjusting the pulse detection signal.

[0079] In some embodiments, the LED light includes at least two color temperature channels; when acquiring a pulse detection signal, each color temperature channel is driven in a time-division manner to control each color temperature channel to emit test light independently.

[0080] For example, the color temperature channels include a cool white light channel (e.g., 6000K) and a warm white light channel (e.g., 2700K), which are independently packaged. The color temperature of the LED lamp can be continuously adjusted (e.g., 2700K-6000K) by adjusting the ratio of the two driving currents to adapt to different lighting needs. When detecting light decay, time-division driving refers to sending test pulses alternately to the cool white light channel and the warm white light channel based on a preset driving sequence.

[0081] In this embodiment, the accuracy of LED light decay adjustment is improved by independently detecting and compensating each color temperature channel of the LED lamp.

[0082] This embodiment provides a smart range hood, such as Figure 4 As shown, the smart range hood includes: a smart control module and an LED light and a photoelectric detection module connected to the smart control module.

[0083] The intelligent control module is used to implement the steps of the pulse-driven LED light decay compensation method mentioned above.

[0084] LED lights are used for illumination; a photoelectric detection module is used to detect the test light emitted by the LED lights to generate a pulse detection signal. Specifically, the photoelectric detection module includes a photodetector and a signal conditioning circuit. The photodetector detects the light signal emitted by the LED lights; the signal conditioning circuit processes and converts the light signal collected by the photodetector to output a pulse detection signal. The photodetector is installed correspondingly to the LED light.

[0085] In this embodiment, the pulse detection signal output by the photoelectric detection module under the test light of the LED lamp is acquired; the test light is generated by the LED lamp controlled by the pulse drive signal; the response delay index is calculated based on the pulse detection signal and the pulse drive signal; based on the response delay index, the original drive current of the LED lamp is compensated to obtain a new drive current, which solves the problem of poor reliability of LED attenuation compensation. By using the time response characteristics of the signal as the basis for judging the LED attenuation state, adaptive compensation is not only realized, but also the accuracy and reliability of LED light decay compensation are improved.

[0086] In some of these embodiments, such as Figure 4 As shown, it also includes a fan drive module; the fan drive module, connected to the intelligent control module, is used for adjusting the fan's operating speed; the intelligent control module, when acquiring the pulse detection signal output by the photoelectric detection module under LED illumination, controls the fan drive module to enter a noise reduction mode. Specifically, entering the noise reduction mode includes turning off or reducing the fan's operating speed. High-speed airflow (≥5m / s) and motor vibration can cause the range hood to vibrate, such as the vibration of the smoke baffle where the LED lights are installed, leading to a shift in the reflected light path and affecting the detection of the test light. The noise reduction mode can eliminate or reduce the impact of range hood vibration, improving detection accuracy.

[0087] The present embodiment will now be described and illustrated through preferred embodiments.

[0088] Figure 5 This is a schematic diagram showing the relative positions of the smart range hood, stove, cooking appliances, and LED lights after installation in this preferred embodiment. Figure 6 This is a flowchart illustrating the automatic detection and compensation process after the intelligent range hood is turned on in this preferred embodiment. (See also...) Figure 5 The intelligent range hood includes: a fan drive module, an intelligent control module, and an LED light and photoelectric detection module connected to the intelligent control module.

[0089] LED lights are used for illumination; a photoelectric detection module is used to detect the test light emitted by the LED lights to generate a pulse detection signal. Specifically, the photoelectric detection module includes a photodetector and a signal conditioning circuit. The photodetector detects the light signal emitted by the LED lights; the signal conditioning circuit converts the detection signal output by the photodetector into a square wave-like form, corresponding to the timing of the pulse drive signal. The photodetector is installed correspondingly to the LED light, as shown below. Figure 5 As shown, the photodetector is 10cm away from the LED light and is within the illumination angle range of the LED light. Figure 5 The two rays emitted by the LED light indicate the range of illumination angles.

[0090] See Figure 6 The intelligent control module is used to perform the following steps:

[0091] S1. Initialize parameters such as drive current and compensation coefficient after power-on.

[0092] S2. Determine whether the detection cycle has been reached; if the detection cycle has not been reached, then drive the lighting and control the fan based on the initial parameters, and wait for the detection cycle to be reached; if the detection cycle has been reached, then continue to execute step S3.

[0093] S3. Upon arrival of the response detection cycle, the control fan drive module enters the noise reduction mode and acquires the pulse detection signal output by the photoelectric detection module under the test light of the LED lamp; the test light is generated by the LED lamp controlled by the microsecond-level pulse drive signal.

[0094] S4. Obtain the start time of the rising edge of the pulse in the pulse drive signal; extract the detection time when the pulse reaches 0.5 times the peak value from the pulse detection signal; calculate the response delay index of the LED lamp based on the difference between the start time and the detection time.

[0095] S5. Obtain the preset compensation trigger threshold and determine whether the response delay index is greater than the compensation trigger threshold (120ns). If the response delay index is less than or equal to the compensation trigger threshold, maintain the initial parameters or the parameters of the previous cycle for lighting drive and fan control, and return to step S2. If the response delay index is greater than the compensation trigger threshold, continue to execute step S6.

[0096] S6. Determine if the response delay index is greater than the alarm threshold of 300ns. If the response delay index is greater than the alarm threshold, it indicates severe aging and it is recommended to replace it. If the response delay index is less than or equal to the alarm threshold, continue to step S7.

[0097] S7. Calculate the attenuation index based on the response delay index and the preset reference delay index.

[0098] S8. Based on the attenuation index, look up the corresponding compensation coefficient in the table; based on the product of the attenuation index and the compensation coefficient, compensate the original driving current of the LED lamp to obtain the new driving current.

[0099] S8. Control the LEDs and other components to provide normal lighting based on the new drive current, restore the working mode of the fan drive module, and return to step S2.

[0100] In this preferred embodiment, microsecond-level instantaneous detection avoids the influence of slow changes in oil stains, and precise compensation of the drive current is achieved through response delay calculation, avoiding blindly increasing the current and realizing energy saving and consumption reduction. Furthermore, automatic noise reduction during detection eliminates the influence of overall machine vibration, providing accurate light decay detection.

[0101] It should be noted that the steps shown in the above process or in the flowchart of the accompanying figures can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0102] This embodiment also provides a pulse-driven LED light decay compensation device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. The terms "module," "unit," "subunit," etc., used below refer to combinations of software and / or hardware that achieve a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0103] Figure 7 This is a structural block diagram of the pulse-driven LED light decay compensation device of this embodiment, as shown below. Figure 7 As shown, the device includes: a signal acquisition module 71, a delay calculation module 72, and a lighting compensation module 73.

[0104] The signal acquisition module 71 is used to acquire the pulse detection signal output by the photoelectric detection module under the test light of the LED lamp; the test light is generated by the LED lamp controlled by the pulse drive signal.

[0105] The delay calculation module 72 is used to calculate the response delay index based on the pulse detection signal and the pulse drive signal.

[0106] The lighting compensation module 73 is used to compensate the original driving current of the LED lamp based on the response delay index to obtain a new driving current; the new driving current is used to control the LED lamp to provide normal lighting.

[0107] In some embodiments, the response delay index of the LED lamp is calculated based on the phase delay between the pulse detection signal and the pulse drive signal, including:

[0108] Obtain the start time of the rising edge of the pulse in the pulse drive signal;

[0109] The detection time when the pulse reaches a preset intensity is extracted from the pulse detection signal; based on the difference between the start time and the detection time, the response delay index of the LED light is calculated.

[0110] In some of these embodiments, the preset intensity is set to 0.5 times the peak value.

[0111] In some embodiments, the original drive current of the LED is compensated based on the response delay metric to obtain a new drive current, including:

[0112] The attenuation index is calculated based on the response delay index and the preset reference delay index.

[0113] Based on the attenuation index, obtain the corresponding compensation coefficient;

[0114] Based on the attenuation index and compensation coefficient, the original driving current of the LED lamp is compensated to obtain a new driving current.

[0115] In some embodiments, an attenuation metric is calculated based on a response latency metric and a preset reference latency metric, including:

[0116] Obtain the preset compensation trigger threshold and determine whether the response latency index is greater than the compensation trigger threshold;

[0117] If the response delay index is greater than the compensation trigger threshold, the attenuation index is calculated based on the response delay index and the preset reference delay index.

[0118] In some embodiments, the method further includes: calculating the remaining lifetime of the LED carriers based on a response delay metric.

[0119] In some embodiments, the LED light includes at least two color temperature channels; when acquiring a pulse detection signal, each color temperature channel is driven in a time-division manner to control each color temperature channel to emit test light independently.

[0120] It should be noted that the above modules can be functional modules or program modules, and can be implemented through software or hardware. For modules implemented through hardware, the above modules can reside in the same processor; or the above modules can be located in different processors in any combination.

[0121] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated in this embodiment.

[0122] Furthermore, in conjunction with the pulse-driven LED light decay compensation method provided in the above embodiments, this embodiment can also provide a storage medium for implementation. This storage medium stores a computer program; when executed by a processor, the computer program implements any of the pulse-driven LED light decay compensation methods described in the above embodiments.

[0123] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0124] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

[0125] The term "embodiment" in this application refers to a specific feature, structure, or characteristic described in connection with an embodiment that may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily imply the same embodiment, nor does it imply that it is mutually exclusive with or independent of other embodiments. It will be clearly or implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0126] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A method for compensating LED light decay based on pulse driving, characterized in that, The method includes: The pulse detection signal output by the photoelectric detection module under the test light of the LED lamp is acquired; the test light is generated by the LED lamp controlled by the pulse drive signal. Calculate the response delay index based on the pulse detection signal and the pulse drive signal; Based on the response delay index, the original driving current of the LED is compensated to obtain a new driving current; the new driving current is used to control the LED for normal lighting.

2. The LED light decay compensation method based on pulse driving according to claim 1, characterized in that, Based on the pulse detection signal and the pulse drive signal, the response delay index is calculated, including: Obtain the start time of the rising edge of the pulse in the pulse drive signal; The detection time when the pulse reaches a preset intensity is extracted from the pulse detection signal; based on the difference between the start time and the detection time, the response delay index of the LED light is calculated.

3. The LED light decay compensation method based on pulse driving according to claim 2, characterized in that, The preset intensity is set to 0.5 times the peak value.

4. The LED light decay compensation method based on pulse driving according to claim 1, characterized in that, Based on the response delay index, the original driving current of the LED is compensated to obtain a new driving current, including: Based on the response delay index and the preset reference delay index, the attenuation index is calculated; Based on the attenuation index, the corresponding compensation coefficient is obtained; Based on the attenuation index and the compensation coefficient, the original driving current of the LED lamp is compensated to obtain a new driving current.

5. The LED light decay compensation method based on pulse driving according to claim 4, characterized in that, Based on the response delay index and the preset reference delay index, the attenuation index is calculated, including: Obtain a preset compensation trigger threshold and determine whether the response delay index is greater than the compensation trigger threshold; If the response delay index is greater than the compensation trigger threshold, then the attenuation index is calculated based on the response delay index and the preset reference delay index.

6. The LED light decay compensation method based on pulse driving according to claim 1, characterized in that, The method further includes: calculating the remaining lifetime of the charge carriers of the LED lamp based on the response delay index.

7. The LED light decay compensation method based on pulse driving according to claim 1, characterized in that, The LED light includes at least two color temperature channels; when the pulse detection signal is acquired, each color temperature channel is driven in a time-division manner to control each color temperature channel to emit the test light independently.

8. A smart range hood, characterized in that, include: An intelligent control module, and an LED light and a photoelectric detection module connected to the intelligent control module; The intelligent control module is used to implement the steps of the method according to any one of claims 1 to 7; The LED light is used for illumination; The photoelectric detection module is used to detect the test light of the LED lamp to generate a pulse detection signal.

9. The intelligent range hood according to claim 8, characterized in that, It also includes a fan drive module; The fan drive module is connected to the intelligent control module; The intelligent control module is used to control the fan drive module to enter noise reduction mode when it acquires the pulse detection signal output by the photoelectric detection module under the illumination of the LED light.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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