Lamp intelligent control system and light environment regulation method thereof

Abstract

This invention discloses an intelligent lighting control system and its light environment regulation method, including an intelligent lamp, a spectral illuminance sensor, and an IoT gateway. The intelligent lamp and the spectral illuminance sensor are communicatively connected to the IoT gateway. The intelligent lamp's light source includes two light channels. The spectral illuminance sensor collects ambient light parameters, including the relative spectral power distribution and illuminance of the ambient light, and sends them to the IoT gateway. The IoT gateway generates control commands based on the ambient light parameters and sends them to the intelligent lamp. These control commands can be on / off commands, adjustment commands, or other similar commands. The intelligent lamp performs corresponding operations based on the control commands sent by the IoT gateway. This invention can automatically regulate lighting according to changes in ambient light, improving visual efficiency and eye comfort.

Description

Technical Field

[0001] This invention relates to the field of lighting control technology, and in particular to an intelligent control system for lighting fixtures and a method for adjusting the light environment thereon. Background Technology

[0002] Good lighting creates a visual environment that allows people to see objects, move safely, and complete visual tasks effectively, accurately, and safely without causing visual fatigue or discomfort. Therefore, the visual environment created by good lighting is also known as a healthy light environment. However, currently, classroom lighting control primarily relies on single-product, single-area control. This simplistic control method cannot adapt to changes in the environment, resulting in inaccurate and dynamic lighting adjustments that fail to meet the requirements of a healthy light environment and are detrimental to students' vision protection. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an intelligent control system for lighting fixtures and a method for adjusting the light environment thereon, which can automatically adjust the lighting according to changes in ambient light, thereby improving visual efficacy and eye comfort.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a lighting intelligent control system, including an intelligent lamp, a spectral illuminance sensor and an Internet of Things (IoT) gateway, wherein the intelligent lamp and the spectral illuminance sensor are respectively communicatively connected to the IoT gateway, and the light source of the intelligent lamp includes two channel light sources;

[0005] The spectral illuminance sensor is used to collect ambient light parameters and send the ambient light parameters to the Internet of Things gateway. The ambient light parameters include the relative spectral power distribution of ambient light and the illuminance of ambient light.

[0006] The IoT gateway is used to generate control commands based on the ambient light parameters sent by the spectral illuminance sensor, and send the control commands to the smart light. The control commands are light-on commands, light-off commands, or adjustment commands, and the adjustment commands include color temperature adjustment commands and current adjustment commands.

[0007] The smart light is used to perform corresponding operations based on control commands sent by the Internet of Things (IoT) gateway.

[0008] This invention also proposes a method for controlling the light environment based on the above-described intelligent control system for lighting fixtures, comprising:

[0009] Ambient light parameters are collected according to a preset period, including the relative spectral power distribution of ambient light and the illuminance of ambient light.

[0010] Based on the ambient light illuminance and the preset illuminance value, turn on the smart light, turn off the smart light, or adjust the output current of the smart light source.

[0011] Spectral continuity is calculated based on the relative spectral power distribution of the ambient light and the relative spectral power distribution of the preset standard light source.

[0012] If the spectral continuity is less than a preset ratio, the current duty cycle of the two channels of the smart lamp light source is adjusted respectively.

[0013] The beneficial effects of this invention are as follows: Ambient light parameters are collected by a spectral illuminance sensor and sent to an IoT gateway. The IoT gateway analyzes the ambient light parameters, generates corresponding control commands, and sends them to the smart light. The smart light then executes the corresponding actions according to the control commands. This invention can automatically adjust lighting based on changes in ambient light, maintaining the light environment parameters in the illuminated space within an appropriate range, avoiding areas that are too bright or too dark. This improves eye comfort, helps alleviate visual fatigue, enhances visual function, reduces eye strain, and protects eyesight. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a lighting intelligent control system according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the spectrum of the two-channel light source of the smart lamp in a preferred embodiment;

[0016] Figure 3 This is a schematic diagram of the intelligent lighting control system according to Embodiment 1 of the present invention;

[0017] Figure 4 This is a flowchart of the light environment control method according to Embodiment 2 of the present invention;

[0018] Figure 5 This is a schematic diagram of the spectrum of the standard light source in Embodiment 2 of the present invention.

[0019] Label Explanation:

[0020] 1. Smart light; 2. Spectral illuminance sensor; 3. IoT gateway; 4. Control panel; 5. Remote control terminal. Detailed Implementation

[0021] To explain the technical content, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0022] Definitions:

[0023] Relative spectral power distribution: refers to the functional relationship between the relative value of the spectral density of a radiation source and the wavelength. The spectral density is the ratio of the amount of radiation X (radiant flux, radiant intensity, etc.) within a small wavelength width centered on the wavelength to the width of that wavelength. This spectral property of the light source determines its color temperature and color rendering performance.

[0024] Illuminance: also known as illumination, its unit of measurement is "lux", abbreviated as "lx", which represents the luminous flux received per unit area of ​​the surface of a photographed subject. 1 lux is equal to 1 lumen per square meter, that is, the luminous flux received perpendicularly from a light source with a luminous intensity of 1 candela at a distance of one meter on each square meter area of ​​the photographed subject.

[0025] Chromaticity coordinates: These are the ratios of one of the three stimulus values ​​X, Y, and Z to the sum of the other three. X represents the amount of the red primary stimulus, Y represents the amount of the green primary stimulus, and Z represents the amount of the blue primary stimulus.

[0026] Color coordinates: These are the coordinates of a color. The commonly used color coordinate system has the x-axis as the horizontal axis and the y-axis as the vertical axis. With color coordinates, a point can be determined on a chromaticity diagram that precisely represents the color of the emitted light.

[0027] Color temperature: Color temperature is a unit of measurement indicating the color components contained in light. Theoretically, the blackbody temperature refers to the color exhibited by an absolute blackbody after being heated from absolute zero (-273°C). When heated, a blackbody gradually changes from black to red, then to yellow, then to white, and finally emits blue light. The spectral composition of the light emitted by a blackbody at a certain temperature is called the color temperature at that temperature, and the unit of measurement is "K" (Kelvin).

[0028] Correlated color temperature (CBT): When the color of light emitted by a light source matches the color of light radiated by a blackbody (such as platinum) at a certain temperature, the temperature of the blackbody at that moment is expressed as the color temperature of the light source. This approach assumes that the spectral distribution of the light source is relatively close to the blackbody trajectory. However, in reality, the color of light from most lighting sources does not lie exactly on the blackbody radiation line. Therefore, Raymond Davis et al. proposed the concept of correlated color temperature (CBT). The core idea is to represent the correlated color temperature of the light source using the temperature with the shortest distance on a uniform chromaticity diagram, expressed in Kelvin (K).

[0029] Please see Figure 1 A lighting intelligent control system includes a smart lamp, a spectral illuminance sensor, and an Internet of Things (IoT) gateway. The smart lamp and the spectral illuminance sensor are respectively connected to the IoT gateway. The light source of the smart lamp includes two-channel light sources.

[0030] The spectral illuminance sensor is used to collect ambient light parameters and send the ambient light parameters to the Internet of Things gateway. The ambient light parameters include the relative spectral power distribution of ambient light and the illuminance of ambient light.

[0031] The IoT gateway is used to generate control commands based on the ambient light parameters sent by the spectral illuminance sensor, and send the control commands to the smart light. The control commands are light-on commands, light-off commands, or adjustment commands, and the adjustment commands include color temperature adjustment commands and current adjustment commands.

[0032] The smart light is used to perform corresponding operations based on control commands sent by the Internet of Things (IoT) gateway.

[0033] As can be seen from the above description, the beneficial effects of the present invention are: it can automatically adjust the lighting according to changes in ambient light, thereby improving visual efficacy and eye comfort.

[0034] Furthermore, it also includes a control panel, which is communicatively connected to the IoT gateway;

[0035] The control panel is used to receive mode selection instructions and send the scene mode corresponding to the mode selection instructions to the IoT gateway;

[0036] The IoT gateway is also used to obtain the corresponding smart light configuration information according to the received scene mode, generate the corresponding control command according to the corresponding smart light configuration information, and send the corresponding control command to the smart light.

[0037] As can be seen from the above description, by adjusting the lighting according to the scene mode, fine-grained dynamic lighting adjustment can be provided for different application scenarios or different time periods.

[0038] Furthermore, it also includes a remote control terminal, which is communicatively connected to the Internet of Things gateway;

[0039] The remote control terminal is used to send control commands to the IoT gateway;

[0040] The IoT gateway is also used to send control commands sent from the remote control terminal to the smart light.

[0041] Furthermore, the remote control terminal is also used to receive mode selection instructions and send the scene mode corresponding to the mode selection instructions to the IoT gateway.

[0042] As can be seen from the above description, remote control can be achieved.

[0043] Furthermore, the light source of the smart lamp includes a first channel light source and a second channel light source;

[0044] The color temperature range of the first channel light source is 2725±50K, and the color point is within a 3rd order McAdam ellipse region with the center point as the first center point. The coordinates of the first center point are (0.4578, 0.4101).

[0045] The color temperature range of the second channel light source is 6532±200K, and the color point is within a 4th order McAdam ellipse region with the center point as the second center point. The coordinates of the second center point are (0.31223, 0.0.3283).

[0046] The spectral continuity of the first channel light source is greater than or equal to 80%, and the spectral continuity of the second channel light source is greater than or equal to 85%.

[0047] As described above, by setting a dual-channel light source and setting an appropriate parameter range, it is easy to modulate the output spectrum corresponding to different scene modes.

[0048] This invention also proposes a method for controlling the light environment based on the above-described intelligent control system for lighting fixtures, comprising:

[0049] Ambient light parameters are collected according to a preset period, including the relative spectral power distribution of ambient light and the illuminance of ambient light.

[0050] Based on the ambient light illuminance and the preset illuminance value, turn on the smart light, turn off the smart light, or adjust the output current of the smart light source.

[0051] Spectral continuity is calculated based on the relative spectral power distribution of the ambient light and the relative spectral power distribution of the preset standard light source.

[0052] If the spectral continuity is less than a preset ratio, the current duty cycle of the two channels of the smart lamp light source is adjusted respectively.

[0053] As described above, by adjusting the output current of the light source, the illuminance of the smart lamp can be adjusted, thereby achieving illuminance balance in the light environment; by adjusting the current duty cycle of the light source, the output spectrum of the smart lamp can be adjusted, thereby improving the spectral continuity of the light environment.

[0054] Furthermore, the specific steps of turning on the smart light, turning off the smart light, or adjusting the output current of the smart light source based on the ambient light illuminance and the preset illuminance value are as follows:

[0055] If the ambient light illuminance is greater than the preset maximum illuminance value, then the smart light is turned off or the output current of the smart light is reduced according to the preset adjustment step size.

[0056] If the ambient light illuminance is less than the preset minimum illuminance value, the smart light will be turned on or the output current of the smart light will be increased according to the preset adjustment step size.

[0057] As described above, by adjusting the brightness of the lamps according to changes in ambient light, the illuminance balance of the light environment can be precisely maintained.

[0058] Furthermore, the calculation of spectral continuity based on the relative spectral power distribution of the ambient light and the preset relative spectral power distribution of the standard light source specifically involves:

[0059] Spectral continuity is calculated using the formula for spectral continuity, which is as follows:

[0060]

[0061] Among them, C S Indicating spectral continuity, Y R (λ) represents the spectral power value at wavelength λ in the relative spectral power distribution of the preset standard light source, Y T (λ) represents the spectral power value at wavelength λ in the relative spectral power distribution of the ambient light, where Δλ = 1 nm, and (a, b) is a preset wavelength range.

[0062] As described above, spectral continuity represents the ratio of the area of ​​overlap between the test light source and the standard light source to the area of ​​the standard light source. The larger the value, the better the spectral continuity and the closer it is to the standard light source.

[0063] Further, a = 380nm, b = 780nm, the preset ratio is 85%, or a = 425nm, b = 690nm, the preset ratio is 90%.

[0064] Furthermore, the specific steps of adjusting the current duty cycle of the two channels of the smart lamp's light source are as follows:

[0065] Based on a preset standard light source, determine the target mixed color temperature, and based on the target mixed color temperature, determine the coordinates of the center point of the mixed light color point;

[0066] The color coordinates of the two channels of the smart lamp are obtained under preset conditions, wherein the preset condition is that the current duty cycle is 100%.

[0067] Based on the rated output current of the smart lamp and the rated current, rated luminous flux, and number of parallel branches of the two channel light sources of the smart lamp, calculate the luminous measure of the two channel light sources under preset conditions, and determine the luminous measure of the mixed light based on the luminous measure of the two channel light sources under preset conditions.

[0068] Based on the color coordinates and photometric values ​​of the two channel light sources of the smart light under preset conditions, the coordinates of the center point of the mixed light color point, and the photometric value of the mixed light, the target current duty cycle of the two channel light sources is calculated.

[0069] Based on the target current duty cycle of the two light sources, adjust the current duty cycle of the two light sources in the smart lamp respectively.

[0070] As described above, the target mixed color temperature is determined based on the different standard light sources selected. Then, based on the photometric constraints, chromatic constraints, and the parameters of the smart lamp itself, the target current duty cycle of the two channel light sources of the smart lamp is determined, thereby adjusting the current duty cycle so that the smart lamp meets the output spectrum conditions.

[0071] Furthermore, the calculation of the target current duty cycle of the two channel light sources based on the color coordinates and photometric values ​​of the two channel light sources under preset conditions, the coordinates of the center point of the mixed light color point, and the photometric value of the mixed light is specifically as follows:

[0072] The target current duty cycle of the two channels of the smart lamp is calculated according to the current duty cycle calculation formula, which is:

[0073]

[0074] D c Y c +D w Y w =Y m

[0075] Among them, R c =Y c / y c R w =Y w / y w Y c and Y w These are the photometric measurements of the two channel light sources under preset conditions, (x c y c ) and (x w y w The chromaticity coordinates of the two light sources under preset conditions are D, respectively. c and D w The target current duty cycle of the two light sources are respectively, Y m For the photometric measure of mixed light, x m This represents the x-coordinate of the center point of the mixed light color.

[0076] Furthermore, it also includes:

[0077] Preset scene modes and their corresponding smart light configuration information;

[0078] When a scene selection instruction is received, the scene mode corresponding to the scene selection instruction is determined;

[0079] Based on the determined scene mode, obtain the corresponding smart light configuration information, and adjust the color temperature and current duty cycle of the two channel light sources of the smart light according to the corresponding smart light configuration information.

[0080] As can be seen from the above description, by adjusting the lighting according to the scene mode, fine-grained dynamic lighting adjustment can be provided for different application scenarios or different time periods.

[0081] Example 1

[0082] Please refer to Figure 1-3 Embodiment 1 of the present invention is: an intelligent lighting control system that can be applied to classrooms.

[0083] like Figure 1 As shown, it includes a smart light 1, a spectral illuminance sensor 2, and an IoT gateway 3. The smart light 1 and the spectral illuminance sensor 2 are respectively connected to the IoT gateway 3.

[0084] In this embodiment, the smart light 1 includes a smart classroom light and a smart blackboard light. The working surface of the smart classroom light is the classroom desk, and the working surface of the smart blackboard light is the blackboard surface. The spectral illuminance sensor 2 can be a spectrometer. The probe of the spectral illuminance sensor 2 can be installed in a suitable location such as a window or the front wall of the classroom. The installation method is not limited. It can also be installed on the ceiling, facing the working surface of the smart light, or installed facing the window for lighting, or it can be integrated into the light fixture.

[0085] Furthermore, in this embodiment, the smart lamp 1 is configured as a dual-channel light source, meaning that each smart lamp 1 has two light source channels: a first channel light source and a second channel light source. The first channel light source has a color temperature range of 2725±50K, and its color point falls within a 3rd-order McAdam ellipse region with its center point as the first center point (0.4578, 0.4101). The second channel light source has a color temperature range of 6532±200K, and its color point falls within a 4th-order McAdam ellipse region with its center point as the second center point (0.31223, 0.3283). The spectra of both channel light sources are specially modulated and satisfy the spectral continuity condition. The spectral continuity C of the first channel light source... S1 ≥80%, spectral continuity of the second channel light source C S2 ≥85%, wherein the first channel light source reference standard light source is a blackbody radiation curve (BBC) 2700K, and the second channel light source reference standard light source is a CIE D Series 6500K. In a preferred embodiment, the spectral continuity C of the first channel light source is... S1 =81.6%, spectral continuity C of the second channel light source S2 =85.6%, the spectral distribution at this time is as follows Figure 2 As shown.

[0086] In this embodiment, the spectral illuminance sensor is used to collect ambient light parameters and send the ambient light parameters to the Internet of Things gateway. The ambient light parameters include the relative spectral power distribution of ambient light and the illuminance of ambient light.

[0087] The IoT gateway is used to generate control commands based on the ambient light parameters sent by the spectral illuminance sensor, and send the control commands to the smart light. In this embodiment, the control commands are light-on commands, light-off commands, or adjustment commands, and the adjustment commands include color temperature adjustment commands and current adjustment commands.

[0088] The smart light is used to perform corresponding operations based on control commands sent by the Internet of Things (IoT) gateway. For example, if the control command is an "on" command, the light source of the smart light is turned on; if the control command is an "off" command, the light source of the smart light is turned off; if the control command is an "adjust" command, the output current of the two light source channels of the smart light is adjusted, or the current duty cycle of the two light source channels is adjusted.

[0089] Furthermore, such as Figure 3 As shown, it also includes a control panel 4, which is connected to the IoT gateway 3 via an IoT network. The control panel is installed in the classroom, for example, next to the classroom door. Users can select scene modes through the control panel. After receiving a mode selection command, the control panel sends the corresponding scene mode to the IoT gateway. The IoT gateway obtains the corresponding smart light configuration information based on the received scene mode, generates the corresponding control command, and then sends it to the smart light.

[0090] Furthermore, it also includes a remote control terminal 5, such as a PC (computer), tablet, or smartphone. The remote control terminal 5 is connected to the IoT gateway 3 via an IP network to remotely control the smart lights in the classroom. Specifically, users can control the smart lights in the classroom through the remote control terminal; that is, the remote control terminal can directly send control commands to the IoT gateway, which will then forward the control commands to the smart lights. Users can also select scene modes through the remote control terminal. After receiving the mode selection command, the remote control terminal sends the corresponding scene mode to the IoT gateway. The IoT gateway, based on the received scene mode, obtains the corresponding smart light configuration information, generates the corresponding control command, and then sends it to the smart lights.

[0091] This embodiment can automatically adjust the lighting according to changes in ambient light, so that the light environment parameters in the lighting space are maintained within an appropriate range, avoiding local over-brightness or under-darkness, thereby improving eye comfort, relieving visual fatigue, improving visual efficiency, reducing eye load, and protecting eyesight.

[0092] Example 2

[0093] Please refer to Figure 4-5 This embodiment describes a light environment control method based on the intelligent lighting control system of Embodiment 1. It can automatically adjust the parameters of the intelligent lights according to changes in ambient light, maintaining the light environment parameters of the classroom space within an appropriate range and preventing localized areas from being too bright or too dark.

[0094] like Figure 4 As shown, the method in this embodiment includes the following steps:

[0095] S1: Collect ambient light parameters according to a preset period, that is, collect ambient light parameters through a spectral illuminance sensor. Ambient light parameters include the relative spectral power distribution of ambient light and the illuminance of ambient light.

[0096] Furthermore, based on the relative spectral power distribution of ambient light, colorimetric parameters such as chromaticity coordinates, correlated color temperature, and display index of ambient light can be calculated.

[0097] S2: Based on the ambient light illuminance and the preset illuminance value, turn on the smart light, turn off the smart light, or adjust the output current of the smart light source.

[0098] Specifically, if the ambient light illuminance is greater than the preset maximum illuminance value, the smart light is turned off or the output current of the smart light source is reduced according to the preset adjustment step size; if the ambient light illuminance is less than the preset minimum illuminance value, the smart light is turned on or the output current of the smart light source is increased according to the preset adjustment step size.

[0099] This step involves adjusting the brightness of the lighting fixtures based on changes in ambient light to precisely maintain a balanced illuminance in the lighting environment. When the illuminance on the work surface of the smart light exceeds the preset illuminance range, the smart light is turned off or dimmed; conversely, when the illuminance on the work surface falls below the preset illuminance range, the smart light is turned on or brightened. The preset illuminance range can refer to national, industry, or local standards. For ordinary classrooms, the required illuminance value on the work surface is ≥300 lx.

[0100] S3: Calculate spectral continuity based on the relative spectral power distribution of the ambient light and the relative spectral power distribution of the preset standard light source.

[0101] Specifically, spectral continuity is calculated using the formula for spectral continuity:

[0102]

[0103] Among them, C S Indicating spectral continuity, Y R (λ) represents the spectral power value at wavelength λ in the relative spectral power distribution of the preset standard light source, Y T(λ) represents the spectral power value at wavelength λ in the relative spectral power distribution of the ambient light, where Δλ = 1 nm, and (a, b) is a preset wavelength range. In this embodiment, a = 380 nm and b = 780 nm, which is the wavelength range of visible light.

[0104] Spectral continuity C S This represents the ratio of the overlapping area of ​​the test light source (i.e., the light source of the smart lamp) and the standard light source to the area of ​​the standard light source. The larger the value, the better the spectral continuity and the closer it is to the standard light source.

[0105] The spectral energy distribution curve and data of the standard light source are the daylight spectral energy distribution curve, i.e., the standard illuminant, which is a mixture of the CIE-defined D50 standard illuminants. Its spectral distribution curve is as follows: Figure 5 As shown. In particular, the reference standard light source is not limited to D50. It can be based on the latest TM-30 standard, using the blackbody radiation curve BBC as the reference light source for calculations of light sources with a color temperature of 4000K and below. A mixture of the 4000K blackbody radiation curve and D50 standard illumination can be used as the reference light source for measurement and calculation of light sources with a color temperature between 4000K and 5000K. For color temperatures greater than 5000K, a standard illuminator is selected as the reference light source.

[0106] S4: Determine whether the spectral continuity is less than a preset ratio. If yes, proceed to step S5. If no, it means that the spectral continuity of the current smart lamp's light source meets the requirements and no adjustment is needed.

[0107] In this embodiment, the preset ratio is 85%.

[0108] In another alternative embodiment, a = 425 nm and b = 690 nm, a wavelength range that coincides with the high-response wavelength region of the human eye's photopic vision function. Accordingly, if this range is used, the preset ratio is 90%.

[0109] S5: Adjust the current duty cycle of the two channels of the smart light source respectively to ensure that the spectrum continuity of the smart light source meets the output conditions.

[0110] Theoretically, it can be proven that by mixing two LED light sources, there is a definite mapping relationship between the current duty cycle of the two light sources and the color intensity of the mixed light. The determinism is jointly determined by the geometric, photometric, and chromatic constraints under the light mixing technology.

[0111] 1. Geometric Constraints. According to colorimetry, the chromaticity coordinates of the mixed light must lie on the line connecting the chromaticity coordinates of the two light sources involved in the mixing. The specific position depends on the mixing ratio of the two light sources. The geometric constraints for mixing two channels of light are expressed by the following formula:

[0112]

[0113] Among them, (x c y c ) and (x w y w (x) represents the color coordinates of the two light sources (i.e., the cold light source and the warm light source) involved in the light mixing, under a current duty cycle of 100%. m y m ) represents the color coordinates of the mixed light.

[0114] 2. Photometric Constraints. Changing the duty cycle of the driving LED current results in a linear change in photometric values ​​while the chromaticity remains constant. Furthermore, the ratio of photometric values ​​is equal to the ratio of the current duty cycle. Depending on the test conditions, photometric values ​​can be luminous flux, illuminance, brightness, or luminous intensity, while chromaticity values ​​can be chromaticity coordinates or correlated color temperature.

[0115] If the duty cycles of the two light sources are known, the photometric value of the mixed light can be calculated using the superposition principle as follows:

[0116] D c Y c +D w Y w =Y m

[0117] Among them, Y c and Y w D represents the photometric measurements of the two light sources involved in the light mixing under a current duty cycle of 100%. c and D w These represent the current duty cycles of the two light sources, Y. m This is the photometric measure of mixed light.

[0118] 3. Chromaticity Constraints. Based on the principle of additive color mixing and the CIE 1931 color coordinate calculation method, when the current duty cycles are Dc and Dw, the color coordinates of the mixed light from the two light sources should satisfy:

[0119]

[0120] Among them, R c =Y c / y c R w =Y w / y w .

[0121] In fact, according to the geometric constraints, when the chromaticity coordinates of the two light sources and the x-coordinate of the mixed light are known, the y-coordinate of the mixed light is determined and unique. Therefore, the chromaticity constraint of the mixed light from two light sources can be simplified to:

[0122]

[0123] Different color temperature environments can be selected according to different scenario requirements. First, the color coordinates and color temperature of the center point of the mixed light can be determined. Then, based on the above constraints and the design parameters of the smart lamp, the current duty cycle of the two light sources can be determined to adjust the mixed color temperature and current duty cycle of the two channel light sources of the smart lamp.

[0124] Therefore, this step includes the following steps:

[0125] S501: Determine the target mixed color temperature based on the preset standard light source, and determine the coordinate value of the center point of the mixed light color point based on the target mixed color temperature.

[0126] The coordinates of the center point of the mixed light color point corresponding to different target mixed color temperatures can be constrained according to the color temperature center point defined by the ANSI standard, as shown in Table 1.

[0127] Table 1: Correspondence between target mixed color temperature and coordinates of the center point of the mixed light color point

[0128] Target mixed color temperature (K) x y 2700 0.4578 0.4101 300 0.4339 0.4033 3500 0.4078 0.393 4000 0.3818 0.3797 5000 0.3446 0.3551 5700 0.3287 0.3425 6500 0.3123 0.3283

[0129] For example, when the standard light source is set to D50 standard illumination and the target mixed color temperature is 5000K, the coordinates of the center point of the mixed light color point are (0.3446, 0.3551).

[0130] S502: Obtain the color coordinates of the two channel light sources of the smart lamp under preset conditions, wherein the preset conditions are a current duty cycle of 100%; specifically, these can be obtained through the initial factory settings parameters of the smart lamp.

[0131] In this embodiment, based on the initial factory settings of the smart lamp, when the current duty cycle is 100%, the coordinates of the center point of the color point of the first channel light source (x) are... w y w ) = (0.4578, 0.4101), the coordinates of the center point of the color point of the second channel light source (x c y c = (0.31223, 0.3283).

[0132] S503: Based on the rated output current of the smart lamp and the rated current, rated luminous flux, and number of parallel branches of the two channel light sources of the smart lamp, calculate the luminous measure of the two channel light sources under preset conditions, and determine the luminous measure of the mixed light based on the luminous measure of the two channel light sources under preset conditions.

[0133] Each channel light source consists of multiple LEDs, which form a circuit in a specific series-parallel configuration. For example, the LED series-parallel configuration of a smart classroom light is 13P20S, which includes 13 parallel branches, with 20 LEDs connected in series in each parallel branch; the LED series-parallel configuration of a smart blackboard light is 8P20S, which includes 8 parallel branches, with 20 LEDs connected in series in each parallel branch.

[0134] In this embodiment, the rated parameters of the smart lamp and the LED light source settings are as shown in Table 2.

[0135] Table 2: Rated Parameters and LED Light Source Settings for Smart Lamps

[0136] Rated output current (A) LED rated current (A) LED rated luminous flux (lm) Number of parallel LED branches Smart classroom lights 0.56 0.15 60 13 Smart blackboards, etc. 0.56 0.15 60 8

[0137] For smart lights, the photometric value Y of the two light source channels involved in light mixing under a current duty cycle of 100% is... c Y w The luminance can be obtained from the linear relationship between the luminance and current curve of the LED light source. In this embodiment, the formula for calculating the luminance is as follows:

[0138]

[0139] Therefore, the photometric value of the first channel light source under a current duty cycle of 100% = (rated output current of the smart lamp / number of parallel LED branches of the first channel light source) × (rated luminous flux of the LEDs of the first channel light source / rated current of the LEDs of the first channel light source); the photometric value of the second channel light source under a current duty cycle of 100% = (rated output current of the smart lamp / number of parallel LED branches of the second channel light source) × (rated luminous flux of the LEDs of the second channel light source / rated current of the LEDs of the second channel light source).

[0140] Based on the above formula for calculating photometric values, and in conjunction with Table 2, the photometric values ​​Y of the two channel light sources of the smart classroom light can be calculated respectively. c =Y w ≈18lm, the luminous efficacy Y of the two-channel light source of the smart blackboard light c =Y w ≈28lm.

[0141] In addition, the photometric value Y of the mixed light m ≤max(Y c Y w In this embodiment, Y m =Y c Or Y m =Y w .

[0142] S504: Calculate the target current duty cycle of the two channel light sources based on the color coordinates and photometric values ​​of the two channel light sources under preset conditions, the coordinates of the center point of the mixed light color point, and the photometric value of the mixed light.

[0143] Specifically, based on the photometric and chromatic constraints mentioned above, the target current duty cycle of the two power supply channels of the smart lamp can be calculated separately, and the specific calculation formula is as follows:

[0144]

[0145] D c Y c +D w Y w =Y m

[0146] Among them, R c =Y c / y c R w =Y w / y w Y c Y is the photometric value of the first channel light source under a current duty cycle of 100%. w The photometric value of the second channel light source under a current duty cycle of 100%; D c and D w These represent the target current duty cycles of the two light sources; (x c y c (x) represents the color coordinates of the first channel light source under full current and a current duty cycle of 100%. w y w (x) represents the color coordinates of the second channel light source under a current duty cycle of 100%. m The x-coordinate of the center point of the mixed light color; the y-coordinate of the center point. m This is the photometric measure of mixed light.

[0147] S505: Adjust the current duty cycle of the two light sources in the smart lamp according to the target current duty cycle of the two light sources.

[0148] Once the target current duty cycle is calculated, the current duty cycle of the two channels of the smart lamp can be adjusted accordingly.

[0149] In this step, the smart lamp adjusts the spectral changes by adjusting the duty cycle of the light source's current, thereby automatically adjusting and matching the standard light source for output.

[0150] In the above steps, the spectral distribution of the surrounding environment is collected and fitted with a standard light source using an algorithm to adjust the spectral distribution of the two light source channels. When the spectral continuity C S The spectrum is only output when the ratio is greater than or equal to a preset value, which can improve eye comfort, reduce eye fatigue and visual illusions, reduce eye load, and protect vision.

[0151] Furthermore, in this embodiment, the lighting environment can be adjusted according to the scene mode selected by the user. Specifically, scene modes and their corresponding smart light configuration information are preset; when a scene selection command is received through the control panel or remote control terminal, the scene mode corresponding to the scene selection command is determined, and the color temperature and current duty cycle of the two channels of the smart light are adjusted according to the corresponding smart light configuration information.

[0152] This embodiment includes the following scenario modes:

[0153] 1. Wake-up Mode: This function is applied to the first class in the morning and afternoon. In this mode, the color temperature (i.e., the mixed color temperature of the two light sources) of the smart classroom lights and smart blackboard lights is uniformly set to 5700K. The current duty cycle of the first light source in the smart classroom lights and smart blackboard lights is set to 21.0%, and the current duty cycle of the second light source is set to 59.0%. The average illuminance on the desk is adjusted to 350-400 lx, and the average illuminance on the blackboard is adjusted to 550-600 lx.

[0154] 2. In general teaching mode, the function is applied to reading and writing scenarios. The color temperature of the smart classroom lights and smart blackboard lights is uniformly set to 5000K. The current duty cycle of the first channel light source in the smart classroom light is set to 26.3%, and the current duty cycle of the second channel light source is set to 73.7%. The average illuminance on the desk is adjusted to 450-500 lx. The current duty cycle of the first channel light source in the smart blackboard light is set to 23.6%, and the current duty cycle of the second channel light source is set to 66.4%. The average illuminance on the blackboard surface is adjusted to 650-700 lx.

[0155] 3. Examination Mode: This function is applied to examination scenarios. The color temperature of both the smart classroom light and the smart blackboard light is uniformly set to 5000K. The current duty cycle of the first channel light source in the smart classroom light is set to 26.3%, and the current duty cycle of the second channel light source is set to 73.7%. The average illuminance on the desk is adjusted to 450-500 lx. The current duty cycle of the first channel light source in the smart blackboard light is set to 13.1%, and the current duty cycle of the second channel light source is set to 36.9%. The average illuminance on the blackboard surface is adjusted to 300-350 lx.

[0156] 4. Relaxation Mode: This function is used for rest scenarios such as lunch breaks. The color temperature of the smart classroom lights and smart blackboard lights is uniformly set to 3000K. The current duty cycle of the first channel light source in the smart classroom light is set to 21.6%, and the current duty cycle of the second channel light source is set to 3.4%. The average illuminance on the desk is reduced to 30-60 lx, and the smart blackboard light is turned off.

[0157] 5. Nighttime Class Mode: This function is applied to nighttime classes. The color temperature of both the smart classroom light and the smart blackboard light is uniformly set to 4000K. The duty cycle of the first channel light source in the smart classroom light is set to 50.7%, and the duty cycle of the second channel light source is set to 44.3%. The average illuminance on the desk is adjusted to 450-500 lx. The duty cycle of the first channel light source in the smart blackboard light is set to 39.1%, and the duty cycle of the second channel light source is set to 34.2%. The average illuminance on the blackboard surface is adjusted to 500-550 lx.

[0158] 6. Nighttime Study Mode: This function is used for evening study sessions. The color temperature of both the smart classroom light and the smart blackboard light is uniformly set to 4000K. The duty cycle of the first channel light source in the smart classroom light is set to 50.7%, and the duty cycle of the second channel light source is set to 44.3%. Adjust the average illuminance of the desk to 450-500 lx, turn off the blackboard light, or adjust the average illuminance of the blackboard surface to 100-200 lx. At this time, the duty cycle of the first channel light source in the smart blackboard light is set to 14.2%, and the duty cycle of the second channel light source is set to 12.4%.

[0159] By using scene-based lighting control, precise dynamic adjustments can be made for different application scenarios or time periods, and can specifically enhance brain excitation, strengthen concentration, and improve learning efficiency.

[0160] In summary, the intelligent lighting control system and its light environment regulation method provided by this invention can automatically regulate lighting according to changes in ambient light, maintaining the light environment parameters in the lighting space within an appropriate range, avoiding localized overbrightness or dimness, thereby improving eye comfort, relieving visual fatigue, enhancing visual efficiency, reducing eye strain, and protecting eyesight. By regulating lighting according to scene modes, it can provide refined dynamic lighting adjustments for different application scenarios or time periods, specifically enhancing brain excitation, strengthening concentration, and improving learning efficiency.

[0161] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A lighting intelligent control system, characterized in that, It includes a smart light, a spectral illuminance sensor, and an IoT gateway. The smart light and the spectral illuminance sensor are respectively connected to the IoT gateway. The light source of the smart light includes two-channel light sources. The spectral illuminance sensor is used to collect ambient light parameters and send the ambient light parameters to the Internet of Things gateway. The ambient light parameters include the relative spectral power distribution of ambient light and the illuminance of ambient light. The IoT gateway is used to generate control commands based on ambient light parameters sent by a spectral illuminance sensor, and send the control commands to the smart lamp. The control commands are either a light-on command, a light-off command, or an adjustment command. The adjustment commands include color temperature adjustment commands and current adjustment commands. The current adjustment command is used to adjust the output current or current duty cycle of the two light sources of the smart lamp. By adjusting the output current of the light sources, the illuminance of the smart lamp is adjusted to achieve illuminance balance in the light environment. Spectral continuity is calculated based on the relative spectral power distribution of the ambient light and the preset relative spectral power distribution of a standard light source. If the spectral continuity is less than a preset ratio, the current duty cycle of the two channels of the smart lamp light source is adjusted respectively. By adjusting the current duty cycle of the light source, the output spectrum of the smart lamp can be adjusted, thereby improving the continuity of the light environment spectrum. The smart light is used to perform corresponding operations based on control commands sent by the Internet of Things (IoT) gateway.

2. The intelligent lighting control system according to claim 1, characterized in that, It also includes a control panel, which is communicatively connected to the IoT gateway; The control panel is used to receive mode selection instructions and send the scene mode corresponding to the mode selection instructions to the IoT gateway; The IoT gateway is also used to obtain the corresponding smart light configuration information according to the received scene mode, generate the corresponding control command according to the corresponding smart light configuration information, and send the corresponding control command to the smart light.

3. The intelligent lighting control system according to claim 2, characterized in that, It also includes a remote control terminal, which is communicatively connected to the IoT gateway; The remote control terminal is used to send control commands to the IoT gateway; The IoT gateway is also used to send control commands sent from the remote control terminal to the smart light.

4. The intelligent lighting control system according to claim 3, characterized in that, The remote control terminal is also used to receive mode selection instructions and send the scene mode corresponding to the mode selection instructions to the IoT gateway.

5. The intelligent lighting control system according to any one of claims 1-4, characterized in that, The light source of the smart lamp includes a first channel light source and a second channel light source; The color temperature range of the first channel light source is 2725±50K, and the color point is within a 3rd order McAdam ellipse region with the center point as the first center point. The coordinates of the first center point are (0.4578, 0.4101). The color temperature range of the second channel light source is 6532±200K, and the color point is within a 4th order McAdam ellipse with the center point as the second center point. The coordinates of the second center point are (0.31223, 0.3283). The spectral continuity of the first channel light source is greater than or equal to 80%, and the spectral continuity of the second channel light source is greater than or equal to 85%.

6. A method for controlling the light environment based on the intelligent lighting control system as described in any one of claims 1-5, characterized in that, include: Ambient light parameters are collected according to a preset period, including the relative spectral power distribution of ambient light and the illuminance of ambient light. Based on the ambient light illuminance and the preset illuminance value, turn on the smart light, turn off the smart light, or adjust the output current of the smart light source. Spectral continuity is calculated based on the relative spectral power distribution of the ambient light and the relative spectral power distribution of the preset standard light source. If the spectral continuity is less than a preset ratio, the current duty cycle of the two channels of the smart lamp light source is adjusted respectively.

7. The light environment control method according to claim 6, characterized in that, The specific steps of turning on the smart light, turning off the smart light, or adjusting the output current of the smart light source based on the ambient light illuminance and the preset illuminance value are as follows: If the ambient light illuminance is greater than the preset maximum illuminance value, then the smart light is turned off or the output current of the smart light is reduced according to the preset adjustment step size. If the ambient light illuminance is less than the preset minimum illuminance value, the smart light will be turned on or the output current of the smart light will be increased according to the preset adjustment step size.

8. The light environment control method according to claim 6, characterized in that, The calculation of spectral continuity based on the relative spectral power distribution of the ambient light and the relative spectral power distribution of a preset standard light source specifically involves: Spectral continuity is calculated using the formula for spectral continuity, which is as follows: ， Among them, C S Indicating spectral continuity, Y R (λ) represents the spectral power value at wavelength λ in the relative spectral power distribution of the preset standard light source, Y T (λ) represents the spectral power value at wavelength λ in the relative spectral power distribution of the ambient light, where Δλ = 1 nm, and (a, b) is a preset wavelength range.

9. The light environment control method according to claim 8, characterized in that, a=380nm, b=780nm, the preset ratio is 85%, or a=425nm, b=690nm, the preset ratio is 90%.

10. The light environment control method according to claim 6, characterized in that, The specific steps for adjusting the current duty cycle of the two light sources in the smart lamp are as follows: Based on a preset standard light source, determine the target mixed color temperature, and based on the target mixed color temperature, determine the coordinates of the center point of the mixed light color point; The color coordinates of the two light sources of the smart lamp are obtained under preset conditions, wherein the preset condition is that the current duty cycle is 100%. Based on the rated output current of the smart lamp and the rated current, rated luminous flux, and number of parallel branches of the two channel light sources of the smart lamp, calculate the luminous measure of the two channel light sources under preset conditions, and determine the luminous measure of the mixed light based on the luminous measure of the two channel light sources under preset conditions. Based on the color coordinates and photometric values ​​of the two channel light sources of the smart light under preset conditions, the coordinates of the center point of the mixed light color point, and the photometric value of the mixed light, the target current duty cycle of the two channel light sources is calculated. Based on the target current duty cycle of the two light sources, adjust the current duty cycle of the two light sources in the smart lamp respectively.

11. The light environment control method according to claim 10, characterized in that, The specific calculation of the target current duty cycle of the two channel light sources based on the color coordinates and photometric value of the two channel light sources under preset conditions, the coordinates of the center point of the mixed light color point, and the photometric value of the mixed light is as follows: The target current duty cycle of the two channels of the smart lamp is calculated according to the current duty cycle calculation formula, which is: Among them, R c =Y c / y c R w =Y w / y w Y c and Y w These are the photometric measurements of the two channel light sources under preset conditions, (x c y c ) and (x w y w The chromaticity coordinates of the two light sources under preset conditions are D and D, respectively. c and D w The target current duty cycle of the two light sources are respectively, Y m For the photometric measure of mixed light, x m This represents the x-coordinate of the center point of the mixed light color.

12. The light environment control method according to claim 6, characterized in that, Also includes: Preset scene modes and their corresponding smart light configuration information; When a scene selection instruction is received, the scene mode corresponding to the scene selection instruction is determined; Based on the determined scene mode, obtain the corresponding smart light configuration information, and adjust the color temperature and current duty cycle of the two channel light sources of the smart light according to the corresponding smart light configuration information.

Images