Multi-sensor fusion adaptive dimming and color modulation system for smart home and control method

Abstract

The invention relates to the technical field of smart home, in particular to a multi-sensor fusion adaptive dimming and color modulation system for smart home and a control method, and the system comprises a distributed illumination array which comprises a plurality of illumination partitions and an edge calculation controller, an illuminance sensor, a spectrum sensor, a power supply ripple monitor, a junction temperature sensor, an intelligent dimming driving module and a thermal management module which are in communication connection with the edge computing controller are arranged in each lighting subarea, and the lighting subareas comprise a first lighting subarea and a second lighting subarea which are physically adjacent to each other. The photoelectric thermal coupling unbalance state of the illumination partition can be accurately identified by monitoring multiple items of data such as illumination, spectral distribution, power supply ripple and junction temperature in real time, and the dimming process can be optimized and the overall lighting effect of the system can be improved through a cooperative regulation and control strategy based on an electrical connection topological relation and ripple propagation time sequence characteristics.

Description

Technical Field

[0001] This invention relates to the field of smart home technology, specifically to a multi-sensor fusion adaptive dimming and color-adjusting system and control method for smart homes. Background Technology

[0002] With the rapid development of smart home and green building technologies, lighting systems are no longer just tools for providing basic brightness, but are evolving towards intelligence, personalization, health and energy saving. Modern lighting systems typically adopt a distributed layout, dividing large spaces into multiple lighting zones and using sensors and controllers to achieve zoned adjustment.

[0003] In existing smart lighting technologies, common control methods are mainly based on ambient light illuminance sensors and human infrared sensors to achieve light turning on when people are present, turning off when people leave, and constant illuminance control. In addition, to improve user experience, many high-end systems have introduced spectral sensors to achieve dynamic adjustment of color temperature.

[0004] However, with the increase in LED lighting power density and the increasing requirements for control precision, traditional control strategies have gradually revealed serious technical bottlenecks in practical applications. Traditional methods usually only monitor illuminance and color temperature, ignoring key parameters such as power supply ripple and junction temperature, leading to electrical interference and thermal imbalance problems. In addition, traditional control strategies are passive responses, lacking predictive capabilities based on transfer function models, and cannot suppress resonance risks. At the same time, each zone is controlled independently without considering electrical topology relationships, resulting in resource waste and uneven light color. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-sensor fusion adaptive dimming and color adjustment system for smart homes, comprising: A distributed lighting array, comprising multiple lighting zones and an edge computing controller, wherein each lighting zone is equipped with an illuminance sensor, a spectrum sensor, a power ripple monitor, a junction temperature sensor, an intelligent dimming drive module, and a thermal management module that are communicatively connected to the edge computing controller; the lighting zones include a first lighting zone and a second lighting zone that are physically adjacent to each other. A multi-dimensional state detection module is used to acquire photoelectric and thermal coupling state information in each lighting zone based on the detection results of each illuminance sensor, spectral sensor, power ripple monitor, and junction temperature sensor; wherein, the photoelectric and thermal coupling state information includes the dimming slope change rate and the power ripple amplitude; The collaborative control module is used to send corresponding control commands to the intelligent dimming drive module and the thermal management module according to the electrical connection topology relationship between the photoelectric thermal coupling state information and the first lighting zone and the second lighting zone, and in accordance with a preset coupling suppression strategy.

[0006] Preferably, based on the photoelectric and thermal coupling state information and the electrical connection topology between the first lighting zone and the second lighting zone, corresponding control commands are sent according to a preset coupling suppression strategy, including: In response to detecting that the power ripple amplitude in the first lighting zone exceeds a preset ripple threshold, a frequency reduction smoothing command is sent to the intelligent dimming drive module of the first lighting zone. In response to detecting that the power ripple amplitude of the first lighting zone has recovered to a safe range, the corresponding ripple propagation timing characteristics are obtained; wherein, the ripple propagation timing characteristics are the time delay and attenuation characteristics of the ripple signal propagating from the first lighting zone to the second lighting zone via the common power line; Based on the ripple propagation timing characteristics, determine whether the ripple signal generates resonance risk in the second lighting zone, and obtain the resonance risk judgment result; In response to the resonance risk assessment result indicating the existence of resonance risk, a slope locking command is sent to the intelligent dimming drive module in the first lighting zone, and a preheating command is sent to the thermal management module in the second lighting zone.

[0007] Preferably, in response to detecting that the power ripple amplitude in the first lighting zone exceeds a preset ripple threshold, a frequency reduction smoothing command is sent to the intelligent dimming drive module of the first lighting zone, including: In response to the detection that the first lighting zone and the second lighting zone share the same power supply circuit, the voltage-current phase difference trajectory diagram of the power supply circuit within a preset time period is obtained; Determine the magnitude of the harmonic distortion rate of the phase difference trajectory diagram of the first lighting zone and the phase difference trajectory diagram of the second lighting zone; Send a command to the intelligent dimming drive module of the lighting zone corresponding to the phase difference trajectory diagram with high harmonic distortion rate to reduce the PWM frequency, and adjust its dimming slope synchronously.

[0008] Preferably, after determining whether the ripple signal poses a resonance risk within the second illumination zone based on the ripple propagation timing characteristics, the method further includes: In response to the resonance risk assessment result indicating that there is no resonance risk, the duration of stability after the first lighting zone recovers to a low ripple state is recorded. Determine whether the sustained stable time is greater than a first preset time threshold to obtain a stability determination result; If the stability judgment result indicates that the continuous stable time is not greater than the first preset time threshold, then a command to maintain low-frequency dimming is sent to the intelligent dimming drive module in the first lighting zone.

[0009] Preferably, after determining whether the sustained stable time is greater than a first preset time threshold, the method further includes: In response to the stability judgment result indicating that the continuous stable time is greater than a first preset time threshold, an instruction to increase the dimming frequency is sent to the intelligent dimming drive module of the first lighting zone. Obtain the real-time LED junction temperature values ​​of the first lighting zone and the second lighting zone; Calculate the difference between the real-time LED junction temperature of the first lighting zone and the real-time LED junction temperature of the second lighting zone, and determine whether the absolute value of the difference is greater than the second preset temperature difference; If the absolute value of the difference is greater than the second preset temperature difference, an enhanced heat dissipation command is sent to the thermal management module of the first lighting zone to balance the thermal and light decay characteristics of the two regions.

[0010] Preferably, after calculating the difference between the real-time LED junction temperature of the first lighting zone and the real-time LED junction temperature of the second lighting zone, and determining whether the absolute value of the difference is greater than a second preset temperature difference, the method further includes: If the absolute value of the difference is not greater than the second preset temperature difference, then a command to maintain the current rotation speed is sent to the thermal management module of the first lighting zone, and a control signal linked to the dimming frequency is sent to the associated environmental adjustment device in the smart home system that is connected to the edge computing controller.

[0011] Preferably, the corresponding ripple propagation timing features are obtained, including: The edge computing controller retrieves ripple monitoring data and load current timing data of the power supply node between the first and second lighting zones, collected by the power ripple monitor. Based on the ripple amplitude overshoot in the ripple monitoring data and the current step response in the time-series variation data, a transfer function model of the power network is fitted. The transfer function model is compared with a preset circuit impedance spectrum to generate a visual timing characteristic curve that characterizes the ripple propagation properties.

[0012] Preferably, sending a command to the intelligent dimming drive module of the lighting zone corresponding to the phase difference trajectory diagram with high harmonic distortion rate to reduce the PWM frequency includes: If the harmonic distortion rate of the phase difference trajectory diagram of the first lighting zone is greater than that of the second lighting zone, and the dimming slope change rate of the first lighting zone is positive, then an instruction to reduce the PWM frequency and decrease the dimming step size is sent to its intelligent dimming drive module. If the harmonic distortion rate of the phase difference trajectory diagram of the second lighting zone is greater than that of the first lighting zone, and the second lighting zone is in color gradient mode, then a command to increase the drive current is sent to its intelligent dimming drive module.

[0013] Preferably, sending a command to the intelligent dimming drive module within the first lighting zone to maintain low-frequency dimming includes: The PWM frequency and dimming slope when the first lighting zone returns to a low-ripple state are obtained as the baseline operating parameters. Send a carrier command to the intelligent dimming drive module to maintain the reference frequency, and send a constant speed command to the thermal management module to maintain the reference heat dissipation. The electrical status of the primary lighting zone is detected by the power ripple monitor according to the preset detection cycle. If the ripple amplitude is stable, the command is maintained. If a voltage drop occurs, the frequency is dynamically adjusted to within the safe envelope.

[0014] A control method applicable to the aforementioned multi-sensor fusion adaptive dimming and color-adjusting system for smart homes, comprising: Based on the detection results of each illuminance sensor, spectral sensor, power ripple monitor, and junction temperature sensor, photoelectric thermal coupling status information is obtained within each lighting zone; wherein, the photoelectric thermal coupling status information includes the dimming slope change rate and the power ripple amplitude; Based on the photoelectric and thermal coupling status information and the electrical connection topology of the first lighting zone and the second lighting zone, corresponding control commands are sent to the intelligent dimming drive module and the thermal management module according to a preset coupling suppression strategy.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention enables the system to accurately identify the photoelectric and thermal coupling imbalance state of lighting zones by real-time monitoring of multiple data such as illuminance, spectral distribution, power supply ripple and junction temperature. Through a collaborative control strategy based on electrical connection topology and ripple propagation timing characteristics, the system can adjust the working parameters of the intelligent dimming drive module and thermal management module in a timely manner, thereby optimizing the dimming process and improving the overall luminous efficiency of the system. This invention, by analyzing the voltage-current phase difference trajectory and harmonic distortion rate of the power supply circuit, enables the system to make more accurate judgments, ensuring optimal electrical balance in each lighting zone. By dynamically adjusting the dimming slope and heat dissipation rate based on ripple amplitude, load current step response, and real-time junction temperature, the system can utilize electrical energy more efficiently, reducing energy waste caused by excessive dimming or insufficient heat dissipation, thereby reducing energy consumption and light decay loss. This invention enables preventative measures to be taken before problems occur, such as pre-frequency reduction and smoothing or preheating, through real-time monitoring and mathematical modeling of the system status. This effectively avoids flickering of the lamps or damage to the driver power supply. At the same time, the system can be customized according to the specific electrical topology of different lighting zones, such as shared circuits and bus connections, flexibly responding to various complex wiring environments and scenario requirements, and has strong adaptability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall system architecture in one embodiment of the present invention; Figure 2 This is a schematic flowchart of the overall method in one embodiment of the present invention.

[0017] In the diagram: 1. Distributed lighting array; 2. Multi-dimensional state detection module; 3. Coordinated control module. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1, please refer to Figure 1 This invention provides a technical solution: a multi-sensor fusion adaptive dimming and color adjustment system for smart homes, comprising: Distributed lighting array 1, the distributed lighting array includes multiple lighting zones and an edge computing controller. Each lighting zone is equipped with an illuminance sensor, a spectrum sensor, a power ripple monitor, a junction temperature sensor, an intelligent dimming drive module and a thermal management module that are communicatively connected to the edge computing controller. The lighting zones include a first lighting zone and a second lighting zone that are physically adjacent to each other. The multi-dimensional state detection module 2 is used to acquire photoelectric and thermal coupling state information in each lighting zone based on the detection results of each illuminance sensor, spectral sensor, power ripple monitor, and junction temperature sensor; wherein, the photoelectric and thermal coupling state information includes the dimming slope change rate and the power ripple amplitude; The collaborative control module 3 is used to send corresponding control commands to the intelligent dimming drive module and the thermal management module according to the electrical connection topology relationship between the photoelectric thermal coupling status information and the first lighting zone and the second lighting zone, and in accordance with the preset coupling suppression strategy.

[0020] It's important to note that a distributed lighting array doesn't refer to a single light fixture, but rather a network of physically distributed lighting zones. Each zone can be a room, a functional area, or a specific set of LED light strips. Each zone independently deploys illuminance sensors, spectrum sensors, power ripple monitors, junction temperature sensors, intelligent dimming drive modules, and thermal management modules. An edge computing controller refers to a local computing unit deployed at the lighting site, distinct from a cloud server. It processes sensor data in real time and executes local control logic. For example, in a three-bedroom, one-living-room smart home, the living room is designated as the first lighting zone, and the adjacent dining room as the second. The edge computing controller communicates with various sensors within these two zones, collecting data in real time and directly sending commands to the drive and thermal management modules, avoiding control failures caused by network latency. Optoelectronic-thermal coupling status information refers to a comprehensive index that reflects the dynamic correlation of optical, electrical, and thermal parameters within a lighting zone. Specifically, it includes the dimming slope change rate and power supply ripple amplitude. The dimming slope change rate refers to the rate at which LED brightness changes over time; for example, in movie mode, the light needs to slowly decrease from 100% to 5% within 10 seconds, at which point the slope is negative. If the slope is too large, it will cause discomfort to the human eye and a significant increase in power supply stress. The power supply ripple amplitude refers to the peak value of the AC component superimposed on the DC drive voltage; for example, when the LED driver operates at a specific PWM frequency, without filtering, the output voltage may have a low-frequency ripple of 500mV, which can cause the lamp to flicker and generate electromagnetic interference. Optoelectronic-thermal coupling status refers to the mutual influence between electricity, light, and heat; for example, increased junction temperature can lead to a decrease in LED luminous efficacy, and power supply ripple can cause unstable drive current, thus affecting color temperature. The multi-dimensional status detection module can accurately identify this coupling imbalance state by fusing illuminance, spectrum, ripple, and junction temperature data. Electrical connection topologies specifically include shared circuit topologies and bus topologies. In a shared circuit topology, the first and second lighting zones share the same live or neutral wire. In this case, high-power dimming operations in the first zone will cause a voltage drop across the cable impedance, affecting the voltage stability of the second zone. In a bus topology, multiple zones are connected via a digitally addressable lighting interface bus, and the topology is characterized by node addresses and signal reflection characteristics. For example, if the first and second zones share a power supply circuit, when the first zone performs fast dimming, an induced voltage will be generated on the parasitic inductance of the shared cable. This voltage is the source of ripple interference propagating to the second zone. The coordinated control module must formulate control strategies based on this physical connection relationship. In this embodiment, the electrical connection topology is not manually configured by the user, but is obtained by the edge computing controller through an automatic topology identification program during the system power-on initialization phase. Specifically, the edge computing controller controls the intelligent dimming drive module to inject a weak high-frequency detection signal into the power supply circuit or utilizes the transient response of the load current to collect the amplitude and phase difference of voltage and current, and calculate the equivalent impedance characteristics of the circuit. If the line impedance between the first and second partitions is detected to be close to zero, it is determined to be a shared circuit topology. If a specific node address reflection wave or high impedance characteristic is detected, it is determined to be a bus topology. This automatic identification process is a conventional technical means in the fields of power line communication and intelligent power distribution, and will not be described in detail in this embodiment. The intelligent dimming driver module is responsible for adjusting the current and voltage of the LED to achieve dimming and color adjustment; the thermal management module is responsible for adjusting the speed of the cooling fan or the power of the semiconductor cooling chip. In embodiments requiring active temperature control, a micro heating element (such as a heating plate) can also be integrated to achieve preheating or constant temperature functions. In this embodiment, the two do not work independently. For example, when the system detects that the absolute value of the difference between the real-time value of the LED junction temperature of the first lighting zone and the real-time value of the LED junction temperature of the second lighting zone is greater than the preset temperature difference, the collaborative control module will send an "enhanced heat dissipation command" to the thermal management module of the first lighting zone with a higher junction temperature, and may also send an "increase current" command to its intelligent dimming driver module to achieve a balance between thermal and light decay characteristics.

[0021] In an optional embodiment, based on the photoelectric and thermal coupling state information and the electrical connection topology of the first lighting zone and the second lighting zone, corresponding control commands are sent according to a preset coupling suppression strategy, including: In response to the detection that the power ripple amplitude in the first lighting zone exceeds the preset ripple threshold, a frequency reduction and smoothing command is sent to the intelligent dimming drive module of the first lighting zone. In response to the detection that the power ripple amplitude of the first lighting zone has recovered to a safe range, the corresponding ripple propagation timing characteristics are obtained; wherein, the ripple propagation timing characteristics are the time delay and attenuation characteristics of the ripple signal propagating from the first lighting zone to the second lighting zone via the common power line; Based on the ripple propagation timing characteristics, determine whether the ripple signal will generate resonance risk in the second lighting zone, and obtain the resonance risk judgment result; In response to the resonance risk assessment result indicating the existence of resonance risk, a slope lock command is sent to the intelligent dimming drive module in the first lighting zone, and a preheating command is sent to the thermal management module in the second lighting zone.

[0022] It should be noted that the frequency reduction smoothing command refers to the control signal sent to the intelligent dimming drive module to reduce the pulse width modulation frequency when the system detects that the power ripple amplitude of the first lighting zone exceeds the preset safety threshold. Its purpose is to smooth voltage fluctuations by slowing down the switching frequency. For example, when a sudden increase in ripple caused by the start-up of a high-power appliance is detected in the main light area of ​​the living room, the system reduces the PWM frequency from 1000Hz to 500Hz to reduce the current surge. The ripple propagation timing characteristics specifically describe the time span required for the ripple interference signal to travel along the physically connected power line from the first lighting zone to the second lighting zone and the degree of signal strength attenuation. This is a dynamic parameter reflecting the electrical coupling characteristics. For example, when the lights in the first zone are turned on, ripple is generated. This ripple needs a 5ms delay and its amplitude attenuates by 30% to propagate to the adjacent second zone through the shared live and neutral wires. The resonance risk assessment is an analysis process based on the above timing characteristics to determine whether the inductance and capacitance parameters inside the second lighting zone will resonate with the incoming ripple frequency. If the ripple propagation delay time happens to coincide with the LC resonance period of the second zone's luminaire driver power supply, then a high risk is determined. The slope lock command is a command sent to the first zone's driver module to force the current dimming slope to remain unchanged, used to prevent rapid changes in the dimming signal from triggering new ripples again. For example, when the ripple is detected to have not completely dissipated, the dimming slope is forcibly fixed at a rate of change of 5% per second. The preheating command is a command sent to the thermal management module of the second lighting zone to start the cooling fan or heating element in advance. Its function is to avoid resonance by changing the device temperature to shift the resonant frequency point or reduce the circuit impedance at low temperature. For example, when a resonance risk is detected in the bedroom light strip, the heat sink is started in advance to raise the junction temperature by 5°C to destroy the resonance condition. The above series of commands constitutes an active defense mechanism against the characteristics of electrical topology connection.

[0023] In an optional embodiment, in response to detecting that the power ripple amplitude in the first lighting zone exceeds a preset ripple threshold, a frequency reduction smoothing command is sent to the intelligent dimming drive module of the first lighting zone, including: In response to the detection that the first lighting zone and the second lighting zone share the same power supply circuit, the voltage-current phase difference trajectory diagram of the power supply circuit within a preset time period is obtained; Determine the magnitude of the harmonic distortion rate between the phase difference trajectory diagram of the first lighting zone and the phase difference trajectory diagram of the second lighting zone; Send a command to the intelligent dimming drive module of the lighting zone corresponding to the phase difference trajectory diagram with high harmonic distortion rate to reduce the PWM frequency, and adjust its dimming slope synchronously.

[0024] It should be noted that sharing the same power supply circuit means that the first lighting zone and the second lighting zone are powered by the same circuit breaker, the same set of live and neutral wires, or the same branch power supply. In this case, the current change in one zone will directly affect the power supply stability of the other zone. For example, if the main light in the living room and the chandelier in the dining room are connected to the same circuit, visible ripples are likely to be generated on the dining room chandelier when the main light is quickly brightened. The voltage-current phase difference trajectory diagram refers to the dynamic curve formed by the edge computing controller continuously sampling and recording the phase difference between the voltage waveform and the current waveform of the power supply circuit over a preset time period (such as the last 30 seconds to one minute). This curve can intuitively reflect the nonlinearity of the load and the trend of power factor change. For example, during LED dimming, the phase difference will gradually shift due to the switching action. Harmonic distortion rate refers to the total proportion of higher harmonic components to the fundamental component in a voltage or current waveform, usually expressed as a percentage. The higher the value, the more severe the waveform distortion, and the greater the negative impact on power quality and lighting stability. For example, when the harmonic distortion rate exceeds 10%, the light may flicker slightly or the driver chip may overheat. By comparing the phase difference trajectory diagrams of two lighting zones, it is possible to accurately locate which zone currently has stronger nonlinear load characteristics, thus becoming the main cause of ripple. The instruction to reduce the PWM frequency means that for the zone with a higher harmonic distortion rate, its intelligent dimming driver module is instructed to reduce the pulse width modulation carrier frequency from the normal value to a lower level to reduce the number of high-frequency switching and thus suppress harmonic injection. Synchronous adjustment of the dimming slope refers to slowing down the rate of change of brightness or color temperature in a given zone while reducing the PWM frequency. For example, the dimming step size can be reduced from 5% to 2%, or the transition time from 10% to 90% brightness can be extended from 2 seconds to 5 seconds. This avoids abrupt adjustments caused by the reduction in frequency and further reduces ripple caused by sudden current changes, ensuring that the light changes remain smooth and natural without affecting the user experience.

[0025] In an optional embodiment, after determining whether the ripple signal poses a resonance risk within the second illumination zone based on the ripple propagation timing characteristics, the method further includes: In response to the resonance risk assessment result indicating that there is no resonance risk, the duration of stability after the first lighting zone recovers to a low ripple state is recorded. Determine whether the duration of stability is greater than a first preset time threshold to obtain a stability determination result; If the stability judgment result indicates that the continuous stable time is not greater than the first preset time threshold, then a command to maintain low-frequency dimming is sent to the intelligent dimming drive module in the first lighting zone.

[0026] It should be noted that the continuous stabilization time refers to the cumulative duration during which the system maintains a low ripple state, starting from the moment the power ripple amplitude of the first lighting zone falls back to the safe range. This is measured in real time, for example, in seconds or minutes, until an abnormal ripple amplitude is detected again or the system state changes. The first preset time threshold refers to the pre-set observation window duration used to determine whether the system has completely escaped the risk of fluctuations. For example, it can be set to five to fifteen minutes. This threshold is determined based on experience with the stability of the home power grid. If the continuous stabilization time does not reach this threshold, it indicates that the system is still in a potentially unstable period and may be induced to ripple again due to residual electrical stress or the hysteresis effect of the photoelectric thermal coupling chain. The instruction to maintain low-frequency dimming means that when the observation period is insufficient, the intelligent dimming drive module of the first lighting zone is forced to continue to maintain the current low PWM carrier frequency and slow dimming slope change rate, instead of immediately returning to the normal high-frequency operating mode. For example, even if the ripple has temporarily disappeared, the frequency will not be rashly increased back to 20,000 Hz, but will continue to operate under conservative parameters to prevent the ripple from recurring due to power grid micro-disturbances or dimming behavior of adjacent zones.

[0027] In an optional embodiment, after determining whether the sustained stable time is greater than a first preset time threshold, the method further includes: In response to the stability judgment result indicating that the continuous stable time is greater than the first preset time threshold, an instruction to increase the dimming frequency is sent to the intelligent dimming drive module of the first lighting zone. Obtain the real-time LED junction temperature values ​​for the first lighting zone and the second lighting zone; Calculate the difference between the real-time LED junction temperature of the first lighting zone and the real-time LED junction temperature of the second lighting zone, and determine whether the absolute value of the difference is greater than the second preset temperature difference; If the absolute value of the temperature difference is greater than the second preset temperature difference, an enhanced heat dissipation command is sent to the thermal management module of the first lighting zone to balance the thermal and light decay characteristics of the two zones.

[0028] It should be noted that the instruction to increase the dimming frequency refers to the control signal sent to the intelligent dimming drive module of the first lighting zone to increase the pulse width modulation carrier frequency after the system confirms that the electrical disturbance has been completely eliminated and the stable time has exceeded the preset threshold, in order to restore the high-quality light effect of the lighting. For example, when the system detects that the power ripple in the living room main light area has disappeared and the stable time has exceeded ten minutes, the system restores the PWM frequency of the zone from the conservative frequency of 500Hz used to suppress ripple to more than 2000Hz, which is imperceptible to the human eye, in order to eliminate visual fatigue that may be caused by low-frequency dimming and improve the dimming fineness. Simultaneously, the system collects real-time LED junction temperatures of the first and second lighting zones. These junction temperatures are obtained indirectly through a thermistor integrated on the LED substrate or by utilizing the linear relationship between the LED forward voltage drop and temperature. Subsequently, the system calculates the absolute value of the difference between the junction temperatures of the two zones and compares it with a second preset temperature difference. This second preset temperature difference is typically set to three to five degrees Celsius, with the specific value determined based on the thermal sensitivity of the LED packaging material. If the absolute value of the temperature difference exceeds the second preset temperature difference, it indicates a significant thermal imbalance between the two areas. For example, if the junction temperature of the main light area in the living room is 65 degrees Celsius, while the junction temperature of the adjacent dining room chandelier area is only 58 degrees Celsius, the temperature difference reaches 7 degrees Celsius and exceeds the threshold of 5 degrees Celsius. Since the light decay rate of LEDs is exponentially positively correlated with junction temperature, the luminous flux decay rate in the high-temperature area will be significantly faster than that in the low-temperature area. Long-term operation will lead to obvious differences in brightness and color temperature between two physically adjacent areas, i.e., the appearance of light spots or color differences. At this point, the system sends an enhanced heat dissipation command to the thermal management module of the first lighting zone with a higher junction temperature. This is specifically manifested in increasing the speed of the cooling fan, increasing the power of the thermoelectric cooler, or opening auxiliary heat dissipation channels to accelerate heat dissipation; for example, the system increases the fan speed of the main living room light radiator from 1,000 revolutions per minute to 2,000 revolutions per minute; by forcibly balancing the thermal and light decay characteristics of the two zones, it ensures that the lighting throughout the house maintains visual consistency after long-term operation, avoiding uneven light color caused by differences in heat accumulation.

[0029] In an optional embodiment, after calculating the difference between the real-time LED junction temperature of the first lighting zone and the real-time LED junction temperature of the second lighting zone, and determining whether the absolute value of the difference is greater than a second preset temperature difference, the method further includes: If the absolute value of the difference is not greater than the second preset temperature difference, a command to maintain the current rotation speed is sent to the thermal management module of the first lighting zone, and a control signal linked to the dimming frequency is sent to the associated environmental conditioning device in the smart home system that is connected to the edge computing controller.

[0030] It should be noted that if the absolute value of the difference is not greater than the second preset temperature difference, it indicates that the thermal state between the first lighting zone and the second lighting zone is within the equilibrium range, and no additional strong intervention is needed for local thermal imbalance. At this time, the system sends a command to the thermal management module of the first lighting zone to maintain the current speed, specifically to keep the cooling fan or heat sink at the current operating level, so as to avoid unnecessary energy consumption and noise due to blindly accelerating heat dissipation. For example, when the junction temperature difference between the living room main light and the dining room chandelier is only 2°C and the preset temperature difference is 5°C, the system determines that the thermal state is balanced, and the cooling fan of the living room light fixture maintains a medium speed of 1200 revolutions per minute, rather than running at full speed. Simultaneously, the system sends control signals linked to the dimming frequency to the associated environmental control devices in the smart home system that are connected to the edge computing controller. These associated environmental control devices typically refer to central air conditioning, fresh air systems, or smart curtains. The linkage control signals refer to the coordinated adjustment instructions for environmental devices based on the current operating status of the lighting system. For example, when the dimming frequency of the first lighting zone has been restored to the high-frequency flicker-free mode of 2000Hz, and the thermal management module does not need to dissipate heat at full speed, it indicates that the main indoor heat load has been reduced. The system then sends control signals to the smart air conditioner to raise the set temperature or reduce the air supply volume. This linkage mechanism utilizes the characteristics of improved electrical efficiency and relatively stable heat generation after the lighting system resumes high-frequency operation. By raising the set temperature of the air conditioner, it offsets some of the heat dissipation from the lighting, thereby reducing the overall energy consumption of the whole house while ensuring user comfort.

[0031] It should be further clarified that the aforementioned second preset temperature difference, as well as the subsequently mentioned time threshold and frequency range, are all preferred ranges given based on general LED packaging and typical home environments. In practical applications, those skilled in the art can adaptively modify these thresholds through conventional experiments based on the specific LED chip model used, the heat dissipation structure of the lamp, and the local power grid quality; for example, for junction temperature-sensitive LEDs, the temperature difference threshold can be set to 3°C; for lamps with good heat dissipation, it can be relaxed to 8°C; such adaptive adjustments based on specific hardware and environment are an inevitable extension of the technical solution of this invention.

[0032] In an optional embodiment, obtaining the corresponding ripple propagation timing characteristics includes: The edge computing controller retrieves ripple monitoring data and load current timing data of the power supply node between the first and second lighting zones, collected by the power ripple monitor. Based on the ripple amplitude overshoot in the ripple monitoring data and the current step response in the time-series variation data, a transfer function model of the power network is fitted. The transfer function model is compared with the preset circuit impedance spectrum to generate a visualized time-series characteristic curve that characterizes the ripple propagation properties.

[0033] It should be noted that obtaining the corresponding ripple propagation timing characteristics refers to the process by which the edge computing controller analyzes the dynamic characteristics of electrical interference propagation on the physical line through high-speed data acquisition and system identification technology. In specific implementation, the system first retrieves the original electrical signal of the power supply node between the first lighting zone and the second lighting zone. This power supply node is usually located at the power bus shared by the two zones or at the output end of the distribution box. The power ripple monitor collects the instantaneous value of voltage ripple at a high sampling rate, such as one million times per second, and the load current sensor synchronously records the real-time changes of current, thereby obtaining a timing data sequence with microsecond-level time accuracy. The location of the power supply node and the zone affiliation here are determined based on the aforementioned automatic topology identification results. For example, when the edge computing controller determines that the first lighting zone and the second lighting zone are in a shared circuit topology, the system automatically identifies the physical connection point located at the output end of the distribution box or between the two zones as a critical power supply node. If it is determined to be a bus topology, the relay node for data transmission is located according to the node address table. By combining the automatically identified topology with real-time sensor data, the system can accurately analyze the dynamic characteristics of electrical interference propagation on the physical line. Fitting the transfer function model of a power supply network refers to constructing a mathematical expression reflecting the electrical characteristics of the circuit using mathematical algorithms. For example, when a high-power lamp in the first lighting zone is suddenly turned on, the current undergoes a step change, and the ripple monitor captures the voltage spike overshoot and subsequent damped oscillation. The system uses the least squares method or subspace identification algorithm to substitute this measured input-output data into the circuit equations, calculates the equivalent inductance, capacitance, and resistance parameters of the power supply network, and then generates a transfer function model in the complex frequency domain. This model can quantitatively describe the transmission delay and amplitude attenuation of the ripple signal under specific cable impedances. Comparing the transfer function model with a preset circuit impedance spectrum to generate a visualized time-series characteristic curve representing ripple propagation characteristics refers to the process of verifying the measured model with theoretical standards and outputting the results graphically. The preset circuit impedance spectrum is a standard frequency response curve established based on the power supply circuit design drawings or historical calibration data. The system superimposes and compares the fitted transfer function model with the standard spectrum on a Bode plot or Nyquist plot to calculate the deviation between the actual parameters and the theoretical values. Subsequently, the system uses the inverse Laplace transform to convert the frequency domain model back to the time domain, generating a waveform curve with time as the horizontal axis and normalized amplitude as the vertical axis. This curve intuitively shows the precise time (e.g., 5ms) required for ripple interference to propagate from the first partition to the second partition and the degree of signal strength attenuation (e.g., 30%), thus providing visualized data support for subsequent resonance risk prediction.

[0034] In an optional embodiment, sending a command to reduce the PWM frequency to the intelligent dimming drive module of the lighting zone corresponding to the phase difference trajectory map with high harmonic distortion rate includes: If the harmonic distortion rate of the phase difference trajectory diagram of the first lighting zone is greater than that of the second lighting zone, and the dimming slope change rate of the first lighting zone is positive, then a command to reduce the PWM frequency and decrease the dimming step size is sent to its intelligent dimming drive module. If the harmonic distortion rate of the phase difference trajectory diagram of the second lighting zone is greater than that of the first lighting zone, and the second lighting zone is in color gradient mode, then a command to increase the drive current is sent to its intelligent dimming drive module.

[0035] It should be noted that sending a command to reduce the PWM frequency to the intelligent dimming drive module of the lighting zone corresponding to the phase difference trajectory diagram with high harmonic distortion rate is a differentiated control strategy based on the trade-off between load characteristics and visual requirements. This strategy dynamically adjusts the drive parameters according to the specific working state of the lighting zone to achieve the best balance between suppressing harmonic interference and maintaining lighting quality. Furthermore, before comparing the harmonic distortion rates of the first and second lighting zones, the system first determines the coupling strength between them based on the automatically identified electrical topology. For example, if the system identifies them as a shared loop topology, it considers the two zones to be electrically tightly coupled, and the harmonics of the first zone are very likely to interfere with the second zone, so a more aggressive frequency reduction strategy is adopted. If the system identifies them as relatively independent bus topologies, it may only perform local suppression on the source zone. This differentiated control strategy based on topology coupling strength is implemented through a pre-built topology-strategy mapping table in the edge computing controller. Specifically, if the harmonic distortion rate of the phase difference trajectory diagram of the first lighting zone is greater than that of the second lighting zone, and the dimming slope change rate of the first lighting zone is positive, the system determines that the zone is in a high-power switching phase with rapidly increasing brightness. At this time, the rising edge of the current waveform is extremely steep and contains abundant high-order harmonic components, which can easily couple and interfere with other devices through the shared power line. To suppress this transient interference, the system sends a dual instruction to its intelligent dimming drive module to reduce the PWM frequency and the dimming step size. Reducing the PWM frequency, for example, from 2000Hz to 500Hz, can reduce the number of switching times per unit time, thereby reducing high-frequency switching losses and radiation. Reducing the dimming step size, for example, from 10% to 2% of the single brightness adjustment, can smooth the current surge and avoid drastic voltage fluctuations. If the harmonic distortion rate of the phase difference trajectory diagram of the second lighting zone is greater than that of the first lighting zone, and the second lighting zone is in color gradient mode, the system recognizes that this zone has extremely high requirements for the continuity of light color. Color gradient usually involves the fine matching of RGB multi-channel current. If the PWM frequency is simply reduced at this time, it may lead to an increase in the proportion of current ripple, which in turn causes color temperature drift or color banding, destroying the visual experience. Therefore, instead of reducing the frequency, the system sends a command to its intelligent dimming driver module to increase the drive current. By appropriately increasing the output current amplitude of the constant current source, for example, from the rated 350mA to 450mA, the signal-to-noise ratio of the signal is improved, and the stronger current driving force is used to suppress the impact of ripple on the color mixing accuracy, thereby ensuring the fineness of the color gradient while suppressing harmonics. For example, when a restaurant chandelier makes a slow transition from warm white light to cool white light, this strategy can avoid color jumps caused by frequency reduction and ensure the natural and smooth change of light color.

[0036] In an optional embodiment, sending a command to the intelligent dimming drive module within the first lighting zone to maintain low-frequency dimming includes: The PWM frequency and dimming slope when the first lighting zone returns to a low-ripple state are obtained as the baseline operating parameters. Send a carrier command to the intelligent dimming drive module to maintain the reference frequency, and send a constant speed command to the thermal management module to maintain the reference heat dissipation. The electrical status of the primary lighting zone is detected by the power ripple monitor according to the preset detection cycle. If the ripple amplitude is stable, the command is maintained. If a voltage drop occurs, the frequency is dynamically adjusted to within the safe envelope.

[0037] It should be noted that the low-frequency dimming command is a conservative operating mode with a safety margin, designed to ensure system stability during the observation period after ripple elimination. The system first obtains the PWM frequency and dimming slope at the moment when the power ripple amplitude of the first lighting zone just falls back to the safe range, and locks these parameters as the baseline operating parameters. For example, if the PWM frequency at the moment of ripple elimination is 500Hz and the dimming slope is 5% per second, then this value is frozen as the baseline for subsequent operation. Subsequently, the system sends a carrier command to the intelligent dimming drive module to maintain the baseline frequency, forcing the drive module to maintain a low-frequency operation of 500Hz during the observation period, preventing it from automatically reverting to a high-frequency mode due to internal algorithms. At the same time, it sends a constant-speed command to the thermal management module to maintain the baseline heat dissipation, such as maintaining a constant speed of 1200 revolutions per minute for the cooling fan, to avoid the introduction of new thermal stress by frequent start-stop of the cooling system. In subsequent operation, the system samples the electrical status of the lighting zone in real time through the power ripple monitor according to a preset detection cycle, such as every 100 milliseconds. If the ripple amplitude is detected to be consistently stable within the safety threshold, the current low-frequency, low-speed command is maintained. If a voltage dip is detected on the grid side, such as a momentary voltage drop caused by the input of a high-power load, the dynamic adjustment mechanism is immediately activated. At this time, the system calculates and adjusts the PWM frequency to the safe range in real time based on the pre-stored safety envelope, i.e., the corresponding safety boundary between voltage and frequency. For example, when the voltage dips by 10%, the system may dynamically fine-tune the frequency from 500Hz to 600Hz to improve the driving capability and ensure that the stable output of the lights can still be maintained during grid fluctuations, thereby maximizing the smoothness of dimming while ensuring safety.

[0038] Example 2, please refer to Figure 2 This invention provides a technical solution: a control method applicable to the aforementioned multi-sensor fusion adaptive dimming and color-adjusting system for smart homes, comprising: S1. Based on the detection results of each illuminance sensor, spectral sensor, power ripple monitor, and junction temperature sensor, obtain the photoelectric thermal coupling status information in each lighting zone; wherein, the photoelectric thermal coupling status information includes the dimming slope change rate and the power ripple amplitude; S2. Based on the photoelectric and thermal coupling status information and the electrical connection topology of the first lighting zone and the second lighting zone, send the corresponding control commands to the intelligent dimming drive module and the thermal management module according to the preset coupling suppression strategy.

[0039] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A multi-sensor fusion adaptive dimming and color adjustment system for smart homes, characterized in that, include: A distributed lighting array, comprising multiple lighting zones and an edge computing controller, wherein each lighting zone is equipped with an illuminance sensor, a spectrum sensor, a power ripple monitor, a junction temperature sensor, an intelligent dimming drive module, and a thermal management module that are communicatively connected to the edge computing controller; the lighting zones include a first lighting zone and a second lighting zone that are physically adjacent to each other. A multi-dimensional state detection module is used to acquire photoelectric and thermal coupling state information in each lighting zone based on the detection results of each illuminance sensor, spectral sensor, power ripple monitor, and junction temperature sensor; wherein, the photoelectric and thermal coupling state information includes the dimming slope change rate and the power ripple amplitude; The collaborative control module is used to send corresponding control commands to the intelligent dimming drive module and the thermal management module according to the electrical connection topology relationship between the photoelectric thermal coupling state information and the first lighting zone and the second lighting zone, and in accordance with a preset coupling suppression strategy.

2. The multi-sensor fusion adaptive dimming and color adjustment system for smart homes according to claim 1, characterized in that, Based on the photoelectric and thermal coupling state information and the electrical connection topology of the first lighting zone and the second lighting zone, corresponding control commands are sent according to a preset coupling suppression strategy, including: In response to detecting that the power ripple amplitude in the first lighting zone exceeds a preset ripple threshold, a frequency reduction smoothing command is sent to the intelligent dimming drive module of the first lighting zone. In response to detecting that the power ripple amplitude of the first lighting zone has recovered to a safe range, the corresponding ripple propagation timing characteristics are obtained; wherein, the ripple propagation timing characteristics are the time delay and attenuation characteristics of the ripple signal propagating from the first lighting zone to the second lighting zone via the common power line; Based on the ripple propagation timing characteristics, determine whether the ripple signal generates resonance risk in the second lighting zone, and obtain the resonance risk judgment result; In response to the resonance risk assessment result indicating the existence of resonance risk, a slope locking command is sent to the intelligent dimming drive module in the first lighting zone, and a preheating command is sent to the thermal management module in the second lighting zone.

3. The multi-sensor fusion adaptive dimming and color adjustment system for smart homes according to claim 2, characterized in that, In response to detecting that the power ripple amplitude in the first lighting zone exceeds a preset ripple threshold, a frequency reduction smoothing command is sent to the intelligent dimming drive module of the first lighting zone, including: In response to the detection that the first lighting zone and the second lighting zone share the same power supply circuit, the voltage-current phase difference trajectory diagram of the power supply circuit within a preset time period is obtained; Determine the magnitude of the harmonic distortion rate of the phase difference trajectory diagram of the first lighting zone and the phase difference trajectory diagram of the second lighting zone; Send a command to the intelligent dimming drive module of the lighting zone corresponding to the phase difference trajectory diagram with high harmonic distortion rate to reduce the PWM frequency, and adjust its dimming slope synchronously.

4. A multi-sensor fusion adaptive dimming and color-adjusting system for smart homes according to claim 3, characterized in that, After determining whether the ripple signal poses a resonance risk within the second lighting zone based on the ripple propagation timing characteristics, the method further includes: In response to the resonance risk assessment result indicating that there is no resonance risk, the duration of stability after the first lighting zone recovers to a low ripple state is recorded. Determine whether the sustained stable time is greater than a first preset time threshold to obtain a stability determination result; If the stability judgment result indicates that the continuous stable time is not greater than the first preset time threshold, then a command to maintain low-frequency dimming is sent to the intelligent dimming drive module in the first lighting zone.

5. A multi-sensor fusion adaptive dimming and color-adjusting system for smart homes according to claim 4, characterized in that, After determining whether the sustained stable time is greater than a first preset time threshold, the method further includes: In response to the stability judgment result indicating that the continuous stable time is greater than a first preset time threshold, an instruction to increase the dimming frequency is sent to the intelligent dimming drive module of the first lighting zone. Obtain the real-time LED junction temperature values ​​of the first lighting zone and the second lighting zone; Calculate the difference between the real-time LED junction temperature of the first lighting zone and the real-time LED junction temperature of the second lighting zone, and determine whether the absolute value of the difference is greater than the second preset temperature difference; If the absolute value of the difference is greater than the second preset temperature difference, an enhanced heat dissipation command is sent to the thermal management module of the first lighting zone to balance the thermal and light decay characteristics of the two regions.

6. A multi-sensor fusion adaptive dimming and color-adjusting system for smart homes according to claim 5, characterized in that, After calculating the difference between the real-time LED junction temperature of the first lighting zone and the real-time LED junction temperature of the second lighting zone, and determining whether the absolute value of the difference is greater than a second preset temperature difference, the method further includes: If the absolute value of the difference is not greater than the second preset temperature difference, then a command to maintain the current rotation speed is sent to the thermal management module of the first lighting zone, and a control signal linked to the dimming frequency is sent to the associated environmental adjustment device in the smart home system that is connected to the edge computing controller.

7. A multi-sensor fusion adaptive dimming and color-adjusting system for smart homes according to claim 6, characterized in that, Obtain the corresponding ripple propagation timing features, including: The edge computing controller retrieves ripple monitoring data and load current timing data of the power supply node between the first and second lighting zones, collected by the power ripple monitor. Based on the ripple amplitude overshoot in the ripple monitoring data and the current step response in the time-series variation data, a transfer function model of the power network is fitted. The transfer function model is compared with a preset circuit impedance spectrum to generate a visual timing characteristic curve that characterizes the ripple propagation properties.

8. A multi-sensor fusion adaptive dimming and color-adjusting system for smart homes according to claim 7, characterized in that, Send instructions to the intelligent dimming drive module of the lighting zone corresponding to the phase difference trajectory map with high harmonic distortion rate to reduce the PWM frequency, including: If the harmonic distortion rate of the phase difference trajectory diagram of the first lighting zone is greater than that of the second lighting zone, and the dimming slope change rate of the first lighting zone is positive, then an instruction to reduce the PWM frequency and decrease the dimming step size is sent to its intelligent dimming drive module. If the harmonic distortion rate of the phase difference trajectory diagram of the second lighting zone is greater than that of the first lighting zone, and the second lighting zone is in color gradient mode, then a command to increase the drive current is sent to its intelligent dimming drive module.

9. A multi-sensor fusion adaptive dimming and color-adjusting system for smart homes according to claim 8, characterized in that, Sending a command to the intelligent dimming drive module within the first lighting zone to maintain low-frequency dimming, including: The PWM frequency and dimming slope when the first lighting zone returns to a low-ripple state are obtained as the baseline operating parameters. Send a carrier command to the intelligent dimming drive module to maintain the reference frequency, and send a constant speed command to the thermal management module to maintain the reference heat dissipation. The electrical status of the primary lighting zone is detected by the power ripple monitor according to the preset detection cycle. If the ripple amplitude is stable, the command is maintained. If a voltage drop occurs, the frequency is dynamically adjusted to within the safe envelope.

10. A control method applicable to a multi-sensor fusion adaptive dimming and color-adjusting system for smart homes as described in any one of claims 1-9, characterized in that, include: Based on the detection results of each illuminance sensor, spectral sensor, power ripple monitor, and junction temperature sensor, photoelectric thermal coupling status information is obtained within each lighting zone; wherein, the photoelectric thermal coupling status information includes the dimming slope change rate and the power ripple amplitude; Based on the photoelectric and thermal coupling status information and the electrical connection topology of the first lighting zone and the second lighting zone, corresponding control commands are sent to the intelligent dimming drive module and the thermal management module according to a preset coupling suppression strategy.

Images