Lighting system
By employing visible light communication technology in the lighting system and utilizing internal components of the luminaire to achieve synchronized lighting of the lighting system, the problems of high cost and high power consumption in existing technologies are solved, and low-cost, low-power lighting system control is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENZHEN ASCHIP TECH CO LTD
- Filing Date
- 2026-02-25
- Publication Date
- 2026-05-12
AI Technical Summary
Existing lighting systems are costly and power-intensive when implementing wireless communication between devices, requiring additional wireless communication modules such as Wi-Fi, Bluetooth, or dedicated RF transceivers.
By employing visible light communication technology, utilizing LED beads, LED driver circuits, human body sensing modules, and light receiving modules in the lamps, the main control module controls the information interaction between the lamps in different modes, realizing the linkage lighting of the lighting system and reducing system complexity and power consumption.
No additional wireless communication module is required, which significantly reduces the hardware cost and power consumption of the system, and enables low-cost, low-power linkage control of the lighting system.
Smart Images
Figure CN122028280A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lighting system technology, and in particular to a lighting system. Background Technology
[0002] Modern lighting systems are widely used in smart homes, commercial lighting, industrial automation, and other fields. Their functions have gradually expanded from traditional basic lighting to intelligent control and environmental sensing. Especially in human-sensor lighting scenarios, lighting systems can automatically turn on or off based on people's activity levels, significantly improving energy efficiency and enhancing ease of use and comfort.
[0003] However, in existing technologies, smart lighting systems typically require additional wireless communication modules, such as Wi-Fi, Bluetooth, ZigBee, or dedicated RF transceivers, to achieve wireless communication between devices. While these solutions enable information exchange between lighting fixtures to some extent, they increase system hardware costs and power consumption due to the need for additional wireless communication modules.
[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention
[0005] The main objective of this application is to provide a lighting system that addresses the issues of high cost and high power consumption in existing lighting systems.
[0006] To achieve the above objectives, the lighting system proposed in this application includes multiple luminaires, which communicate with each other via visible light. Each luminaire includes:
[0007] LED beads; An LED driving circuit is electrically connected to the LED beads and is used to drive the LED beads to emit light. The human body sensing module is used to detect human activity information in the area where the lamp is located and output corresponding human body sensing signals; A light receiving module is used to convert received light signals into electrical signals; wherein the electrical signals include a DC component for characterizing ambient light intensity and an AC component for characterizing optical communication information. The main control module is connected to the controlled terminal of the LED driving circuit, the signal output terminal of the human body sensing module, the controlled terminal of the human body sensing module, and the signal output terminal of the light receiving module. The main control module is configured with a master mode and a slave mode. In the main mode, the main control module is configured to: control the human body sensing module to stop working when the ambient light intensity is determined to be not lower than a preset threshold based on the DC component; control the human body sensing module to work when the ambient light intensity is determined to be lower than the preset threshold based on the DC component; and control the LED driving circuit to drive the LED beads to modulate and emit light within a first preset time period according to a preset modulation frequency when the presence of human activity is determined based on the human body sensing signal, so as to provide illumination and broadcast modulated light signals; wherein the preset modulation frequency is not lower than 100Hz; In the slave mode, the master control module is configured to: control the human body sensing module to stop working; when the ambient light intensity is determined to be lower than a preset threshold based on the DC component, and the frequency of the received modulated light signal is determined to be within the deviation range of the preset modulation frequency based on the AC component, control the LED driving circuit to drive the LED beads to emit light within the first preset time period to provide illumination.
[0008] In one embodiment, the master control module is further preset with a master-slave mode, wherein in the master-slave mode, the master control module is configured as follows: When the ambient light intensity is determined to be no less than a preset threshold based on the DC component, the human body sensing module is controlled to stop working; when the ambient light intensity is determined to be less than the preset threshold based on the DC component, the human body sensing module is controlled to work, and when human body activity is determined to exist based on the human body sensing signal, the LED driving circuit is controlled to drive the LED beads to modulate and emit light within a first preset time period according to the preset modulation frequency, so as to provide illumination and broadcast modulated light signals; wherein, the preset modulation frequency is no less than 100Hz; When the ambient light intensity is determined to be lower than a preset threshold based on the DC component, and the received modulated light signal is determined to be within the deviation range of the preset modulation frequency based on the AC component, the LED driving circuit is controlled to drive the LED beads to modulate and emit light within a first preset time period according to the preset modulation frequency, so as to provide illumination and broadcast the modulated light signal.
[0009] In one embodiment, the main control module is also used to suppress its own listening to the AC component when the LED light bead emits light.
[0010] In one embodiment, in the main mode, the main control module is further configured to: The preset control command is converted into a modulation waveform according to a preset digital encoding rule; the modulation waveform is generated based on a preset switching frequency, which is not less than 100Hz. The LED driving circuit is controlled to drive the LED beads to modulate and emit light within a first preset time period according to the modulation waveform, so as to provide illumination and broadcast a modulated light signal containing the preset control command. In the slave mode, the master control module is configured as follows: When the frequency of the received modulated optical signal is determined to be within the deviation range of the preset switching frequency based on the AC component, the modulated optical signal is decoded to extract the control commands contained therein. When the extracted control command matches the preset control command, the LED driving circuit is controlled to drive the LED beads to emit light within the first preset time period to provide illumination.
[0011] In one embodiment, the preset digital encoding rule includes at least one of on / off keying and Manchester encoding.
[0012] In one embodiment, the main control module pre-stores multiple preset modulation frequencies and their corresponding first preset time periods; The multiple preset modulation frequencies are 8 kHz, 9 kHz, 10 kHz, 11 kHz, 12 kHz, 13 kHz, 14 kHz, 15 kHz and 16 kHz, and each preset modulation frequency corresponds to a first preset time period of different durations.
[0013] In one embodiment, the light receiving module includes: A photodiode is used to receive ambient light and convert it into an electrical signal. A transimpedance amplifier circuit is provided, wherein the input terminal of the transimpedance amplifier circuit is electrically connected to the photodiode, and the output terminal of the transimpedance amplifier circuit is connected to the main control module; the transimpedance amplifier circuit is used to amplify the current signal and convert it into a voltage signal output; the voltage signal includes a DC component for characterizing ambient light intensity and an AC component for characterizing optical communication information.
[0014] In one embodiment, the transimpedance amplifier circuit includes an operational amplifier, a first resistor, a second resistor, a third resistor, a first capacitor, and a second capacitor; In this configuration, the non-inverting input terminal of the operational amplifier, the negative terminal of the photodiode, one end of the first resistor, and one end of the first capacitor are connected; the inverting input terminal of the operational amplifier, one end of the second resistor, one end of the third resistor, and one end of the second capacitor are connected; the other end of the second resistor and the first power supply terminal of the operational amplifier are connected to the power supply input terminal of the transimpedance amplifier circuit; the output terminal of the operational amplifier, the other end of the first resistor, and the other end of the first capacitor are connected to the main control module; and the other end of the second capacitor, the other end of the third resistor, the second power supply terminal of the operational amplifier, and the negative terminal of the photodiode are grounded.
[0015] In one embodiment, the human body sensing module includes at least one of a passive infrared sensor, a reflective infrared sensor, a microwave sensing sensor, and a voice recognition module.
[0016] In one embodiment, the LED driving circuit includes a fourth resistor, a fifth resistor, a sixth resistor, and a first switching transistor; Wherein, one end of the fourth resistor is connected to the LED bead, the other end of the fourth resistor is connected to the first end of the first switching transistor, the controlled end of the first switching transistor, one end of the fifth resistor is connected to one end of the sixth resistor, the other end of the fifth resistor is connected to the main control module, and the other end of the sixth resistor and the second end of the first switching transistor are grounded.
[0017] This application's technical solution employs a lighting system comprising multiple lamps that communicate with each other via visible light. Each lamp includes LED beads, an LED driver circuit, a human body sensor module, a light receiving module, and a main control module. The main control module has both a master mode and a slave mode. In master mode, the main control module is configured to: when the ambient light intensity is determined to be no less than a preset threshold based on the DC component, control the human body sensor module to stop working. At this time, it is daytime, requiring neither illumination nor sensing of human activity, thus reducing system power consumption. When the ambient light intensity is determined to be less than the preset threshold based on the DC component, it is nighttime, requiring the sensing of human activity; therefore, control the human body sensor module to operate. When human body activity is detected based on the human body sensor signal, control the LED driver circuit to drive the LED beads to modulate and emit light at a preset modulation frequency for a first preset time period to provide illumination and broadcast the modulated light signal. In slave mode, the master control module is configured to: control the human body sensing module to stop working; when the ambient light intensity is determined to be lower than a preset threshold based on the DC component, and the frequency of the received modulated light signal is determined to be within the deviation range of a preset modulation frequency based on the AC component, the master control module can then deduce the information that "the master mode lamp has sensed human activity" based on the AC component. At this time, it controls the LED driver circuit to drive the LED beads to emit light for a first preset time period to provide illumination. Thus, this application can configure one or more master mode lamps and one or more slave mode lamps to achieve visible light communication between multiple lamps. When the master mode lamp detects human activity and lights up, multiple slave mode lamps can also light up synchronously, realizing the coordinated lighting of the lighting system. This eliminates the need for complex circuits such as Wi-Fi, Bluetooth, or dedicated RF transceivers, reducing circuit costs and avoiding energy loss from additional communication circuits. Furthermore, this application only controls the human body sensing module to work when the ambient light intensity is determined to be lower than a preset threshold based on the DC component, further reducing the power consumption of the lighting system. Compared with existing technologies, this application has lower circuit costs and lower system power consumption. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0019] Figure 1 A schematic diagram of the structure of an embodiment of the lighting system provided in this application; Figure 2 A schematic diagram of another embodiment of the lighting system provided in this application; Figure 3 An electronic circuit diagram of a light receiving module according to an embodiment of the lighting system provided in this application; Figure 4 An electronic circuit diagram of an LED driver circuit block according to an embodiment of the lighting system provided in this application; Figure 5 A schematic diagram of the structure of a first lamp configuration according to an embodiment of the lighting system provided in this application; Figure 6 A schematic diagram of a second type of lamp configuration according to an embodiment of the lighting system provided in this application; Figure 7 A structural schematic diagram of a third lamp configuration according to an embodiment of the lighting system provided in this application; Figure 8 This is a structural schematic diagram of a fourth type of lamp configuration in an embodiment of the lighting system provided in this application.
[0020] Explanation of icon numbers: 10. LED lamp bead; 20. LED driver circuit; 30. Human body sensing module; 40. Light receiving module; 50. Main control module; D1. Photodiode; 41. Transimpedance amplifier circuit; OP. Operational amplifier; R1~R6. First resistor~sixth resistor; C1~C6. First capacitor~second capacitor; Q1. First switching transistor.
[0021] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0024] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.
[0025] In existing technologies, intelligent lighting systems typically rely on additional wireless communication modules, such as Wi-Fi, Bluetooth, ZigBee, or dedicated RF transceivers, to achieve wireless communication between devices. While these solutions enable information exchange between lighting fixtures to some extent, they increase system hardware costs due to the need for additional wireless communication modules, result in higher power consumption, and require complex components and circuits.
[0026] This application proposes a lighting system.
[0027] Please see Figure 1 In one embodiment of this application, the lighting system includes multiple lamps, which communicate with each other via visible light. Each lamp includes: 10 LED beads; LED driver circuit 20 is electrically connected to LED lamp bead 10 and is used to drive LED lamp bead 10 to emit light. The human body sensing module 30 is used to detect human activity information in the area where the lamp is located and output the corresponding human body sensing signal; The light receiving module 40 is used to convert the received light signal into an electrical signal; wherein the electrical signal includes a DC component for characterizing the ambient light intensity and an AC component for characterizing the optical communication information. The main control module 50 is connected to the controlled end of the LED driver circuit 20, the signal output end of the human body sensing module 30, the controlled end of the human body sensing module 30, and the signal output end of the light receiving module 40. The main control module 50 is configured with a master mode and a slave mode. In the main mode, the main control module 50 is configured to: control the human body sensing module 30 to stop working when the ambient light intensity is determined to be not lower than a preset threshold based on the DC component; control the human body sensing module 30 to work when the ambient light intensity is determined to be lower than the preset threshold based on the DC component; and control the LED driving circuit 20 to drive the LED beads 10 to modulate and emit light within a first preset time period according to a preset modulation frequency when the presence of human activity is determined based on the human body sensing signal, so as to provide illumination and broadcast the modulated light signal; wherein, the preset modulation frequency is not lower than 100Hz; In slave mode, the master control module 50 is configured to: control the human body sensing module 30 to stop working; when the ambient light intensity is determined to be lower than a preset threshold based on the DC component, and the frequency of the received modulated light signal is determined to be within the deviation range of the preset modulation frequency based on the AC component, control the LED driving circuit 20 to drive the LED beads 10 to emit light within a first preset time period to provide illumination.
[0028] It should be noted that this application aims to provide a low-cost, low-power distributed human body sensing lighting system. This system achieves visible light communication between lights within the system by reusing the LED beads and photodiode D1 of the luminaire itself, eliminating the need for an additional wireless module, significantly reducing system complexity and cost, and saving more power. It should also be noted that visible light is a light source that can be perceived by the human eye, with a wavelength range between 380nm and 750nm.
[0029] In this embodiment, the lighting system is structured as a master-slave network. In practical applications, any one light fixture in the lighting system can be configured as the master node, and the other light fixtures can be configured as slave nodes. The master node's light fixture communicates with the slave node's light fixtures via visible light. The master node's light fixture can broadcast "human activity detected" information to the slave node's light fixtures, thereby triggering the slave node's light fixtures to turn on.
[0030] It should be noted that the deviation range of the preset modulation frequency can be set to 5%, 10%, 20% or other values according to actual needs. Taking 5% as an example, if the preset modulation frequency is 10kHz, then when the modulation frequency of the detected modulation optical signal is between 9.5kHz and 10.5kHz, it is considered that a valid modulation optical signal has been received. When the modulation frequency of the detected modulation optical signal is in other frequency ranges, it is considered that a valid modulation optical signal has not been received.
[0031] It should be noted that the human body sensing module 30 can employ at least one of the following to sense human activity: a passive infrared sensor, a reflective infrared sensor, a microwave sensor, and a sound recognition module. Specifically, the passive infrared sensor can detect changes in human infrared radiation in the surrounding environment; the reflective infrared sensor can detect the presence of a human body by emitting and receiving reflected infrared light; the microwave sensor can detect moving human bodies through the Doppler effect; and the sound recognition module triggers sensing by recognizing specific sounds (such as footsteps or voice commands). The human body sensing module 30 can output the sensed information to the main control module 50 in the form of a human body sensing signal, and the main control module 50 can then determine whether human activity exists in the area where the lamp is located based on the sensing results.
[0032] The light receiving module 40 can utilize the existing photodiode D1 in the luminaire for detecting ambient light intensity, thus saving circuit costs. This module serves a dual function: first, as a communication receiver, it receives visible light communication information from the luminaire at the master node; second, as an ambient light sensor, it detects the average intensity of ambient light. The main control module 50 can determine whether the ambient light intensity is below a preset threshold based on the DC component output by the light receiving module 40. If it is not below the preset threshold, it indicates that the current environment is daytime, and no lighting is required. In this case, the main control module 50 controls the human body sensing module 30 to stop working, eliminating the need to sense whether there is human activity in the area where the luminaire is located, thereby reducing system power consumption.
[0033] In the master node's luminaires, the master control module 50 controls the LED driver circuit 20 to drive the LED beads 10 to modulate and emit light within a first preset time period according to a preset modulation frequency, thereby providing illumination and broadcasting a modulated light signal. This modulated light signal can send information indicating that "the master node has detected human activity," thus triggering the luminaires on the slave nodes to emit light synchronously. It is understood that the luminaires on the slave nodes do not need to sense human activity; their human activity information is obtained from the luminaires on the master node. Therefore, the human detection module 30 on the slave nodes can be controlled to stop working to reduce system power consumption. In this embodiment, at least one luminaire's master control module 50 can be configured to be in master mode, while the master control modules 50 of other luminaires are all in slave mode.
[0034] In this embodiment, one or more master nodes of lighting fixtures and one or more slave nodes of lighting fixtures are configured. The master control module 50 of the master node lighting fixtures is set to master mode. In master mode, the master control module 50 is configured to: control the human body sensing module 30 to stop working when the ambient light intensity is determined to be not lower than a preset threshold based on the DC component. At this time, it is daytime, and there is no need to provide lighting or sense human activity, which can reduce system power consumption. When the ambient light intensity is determined to be lower than the preset threshold based on the DC component, it is nighttime, and human activity needs to be sensed, so the human body sensing module 30 is controlled to work. When the presence of human activity is determined based on the human body sensing signal, the LED driving circuit 20 is controlled to drive the LED beads 10 to modulate and emit light within a first preset time period according to a preset modulation frequency to provide lighting and broadcast the modulated light signal. The master control module 50 of the slave node's lamps is set to slave mode. In slave mode, the master control module 50 is configured to: control the human body sensing module 30 to stop working; when the ambient light intensity is determined to be lower than a preset threshold based on the DC component, and the frequency of the received modulated light signal is determined to be within the deviation range of a preset modulation frequency based on the AC component, the master control module 50 can then parse the information "the master node's lamps have sensed human activity" based on the AC component. At this time, it controls the LED driving circuit 20 to drive the LED beads 10 to emit light for a first preset time period to provide illumination. In this way, when the master node's lamps detect human activity and light up, the lamps of multiple slave nodes can also light up synchronously, realizing the linkage lighting of the lighting system. This eliminates the need for complex circuits such as Wi-Fi, Bluetooth, ZigBee, or dedicated RF transceivers, reducing circuit costs and avoiding energy loss caused by wireless communication circuit operation. Furthermore, this embodiment only controls the human body sensing module 30 to work when the ambient light intensity is determined to be lower than a preset threshold based on the DC component, further reducing the power consumption of the lighting system. Compared with the prior art, this embodiment has lower circuit costs and lower system power consumption.
[0035] It should be noted that since ambient light can hardly generate noise higher than 8kHz, in one embodiment, a preset modulation frequency of not less than 8kHz can be set to improve the system's anti-interference capability for visible light communication.
[0036] In another embodiment, the preset modulation frequency is set to a frequency range of 8 kHz to 16 kHz. For example, the main control module 50 may pre-store multiple preset modulation frequencies and their corresponding first preset time periods; The preset modulation frequencies are 8 kHz, 9 kHz, 10 kHz, 11 kHz, 12 kHz, 13 kHz, 14 kHz, 15 kHz and 16 kHz, and each preset modulation frequency corresponds to a first preset time period of different durations.
[0037] In this embodiment, 8 kHz, 9 kHz, 10 kHz, 11 kHz, 12 kHz, 13 kHz, 14 kHz, 15 kHz, and 16 kHz can correspond to first preset time periods of 15 seconds, 20 seconds, 30 seconds, 35 seconds, 40 seconds, 45 seconds, 50 seconds, 55 seconds, and 60 seconds, respectively. Thus, this embodiment can adapt to the lighting duration requirements of different application scenarios.
[0038] Please see Figure 2 In one embodiment of this application, the master control module 50 is further preset with a master-slave mode. In the master-slave mode, the master control module 50 is configured as follows: When the ambient light intensity is determined to be no less than a preset threshold based on the DC component, the human body sensing module 30 is controlled to stop working; when the ambient light intensity is determined to be less than the preset threshold based on the DC component, the human body sensing module 30 is controlled to work, and when human body activity is determined to be present based on the human body sensing signal, the LED driving circuit 20 is controlled to drive the LED beads 10 to modulate and emit light within a first preset time period according to a preset modulation frequency to provide illumination and broadcast modulated light signals; wherein, the preset modulation frequency is no less than 100Hz; When the ambient light intensity is determined to be lower than a preset threshold based on the DC component, and the received modulated light signal is determined to be within the deviation range of the preset modulation frequency based on the AC component, the LED driving circuit 20 controls the LED lamp beads 10 to modulate and emit light within a first preset time period according to the preset modulation frequency, so as to provide illumination and broadcast the modulated light signal.
[0039] It should be noted that the luminaires of the master and slave nodes can simultaneously act as master nodes to sense human activity information and broadcast modulated light signals, or as slave nodes to receive modulated light signals and light up their own LED beads 10. The master control module 50 of the luminaires of the master and slave nodes is configured in master-slave mode, which can realize the transmission of visible light information over long distances, thereby lighting up multiple luminaires at a distance.
[0040] It should be noted that this embodiment does not limit the configuration mode of multiple lamps. The configuration mode of multiple lamps can be combined according to the actual lighting needs and installation environment, and the configuration is completed in advance of the main control module 50 of multiple lamps.
[0041] For example, the main control module 50 for multiple lighting fixtures can be configured partly in master mode and partly in slave mode. Please refer to [link / reference]. Figure 5Taking a lighting system consisting of one master node and multiple slave nodes as an example, in darkness, when the master node detects human activity, it emits modulated light. Multiple slave nodes receive this modulated light information and all illuminate. Due to the extremely high speed of light, the multiple lights can illuminate almost simultaneously. After a period of time following the person's departure (i.e., after the master node no longer detects human activity and a first preset time period has elapsed), the lights on multiple nodes turn off. It should be noted that in scenarios with high reliability requirements, within the same area, only one light can be configured as the master node for broadcasting, while the others are configured as slave nodes in receiving mode, to avoid interference from multiple transmitters.
[0042] For example, the main control modules 50 for multiple lighting fixtures can be configured in both master-slave and slave modes. Please refer to [link / reference]. Figure 6 Taking a lighting system, which includes lamps on both sides of a staircase for illuminating the steps, as an example, at night, when a lamp on one side senses human activity information, it sends the human activity information to the lamp on the other side through visible light. At this time, the lamps on both sides light up together, and after a delay, they turn off synchronously after the person leaves.
[0043] For example, the main control modules 50 for multiple lighting fixtures can be configured in master-slave mode for some and slave mode for others. Please refer to [link / reference]. Figure 7 Taking a lighting system comprising four lamps installed on both sides of a corridor as an example, the master control modules 50 of the two lamps on both sides are configured in master-slave mode and slave mode, respectively. In darkness, if the lamps of the master and slave nodes detect human activity information, they control the LED driver circuit 20 to drive the LED beads 10 to modulate and emit light within a first preset time period according to a preset modulation frequency, providing illumination and broadcasting the modulated light signal. At this time, the master and slave nodes on the other side determine, based on the AC component, that the received modulated light signal is within the deviation range of the preset modulation frequency, and control the LED driver circuit 20 to drive the LED beads 10 to modulate and emit light within a first preset time period according to the preset modulation frequency, providing illumination and broadcasting the modulated light signal. At this time, the lamps of the two slave nodes on both sides can receive the human activity information contained in the modulated light, and each controls the LED driver circuit 20 to illuminate the LED beads 10.
[0044] For example, the main control modules 50 for multiple lighting fixtures can also be configured in master mode, master-slave mode, and slave mode respectively. Please refer to [link / reference]. Figure 8Taking a lighting system comprising a master node, multiple master-slave nodes, and a final slave node arranged sequentially along the exit direction as an example. At night, after the master node / master-slave node's lights sense human activity, they transmit this information via visible light to the subsequent lights, until it reaches the last slave node's light. At this point, all the lights at the exit turn on simultaneously. After the person leaves, the lights turn off after a short delay. It should be noted that in a deployment with multiple master-slave nodes, there can be a certain spatial distance and physical obstructions (such as walls or furniture) between the light fixture installation locations, naturally forming multiple non-interfering communication sub-areas.
[0045] Thus, this embodiment expands the application scenarios of the lighting system.
[0046] In one implementation, in master-slave mode / slave mode, the master control module is further used for: When the ambient light intensity is determined to be lower than a preset threshold based on the DC component, and the received modulated light signal is determined to be within the deviation range of the preset modulation frequency based on the AC component, the LED driving circuit 20 is controlled to drive the LED beads 10 to modulate and emit light within the first preset time period according to the preset modulation frequency after a second preset time period, so as to provide illumination and broadcast the modulated light signal.
[0047] It should be noted that the chips used in the main control modules of different lamps have different response times when processing and responding to the light modulation signals broadcast by the main lamp. If one slave lamp starts emitting light before another slave lamp has completed the identification of the AC component, it is easily affected by the emission signal, leading to communication errors or even failure. To address this, this implementation introduces a delay mechanism with a second preset time period in master-slave or slave mode: after confirming that a valid modulated light signal has been received and the ambient light intensity is below a threshold, the slave lamp does not immediately drive the LED to modulate and emit light, but actively delays for the second preset time period until the main lamp completes the full broadcast of the modulated light signal before starting its own modulation and emission. In this way, the superposition of light signals and communication conflicts caused by inconsistent response timing among multiple lamps are effectively avoided, significantly improving the anti-interference capability and decoding reliability of the visible light communication system.
[0048] Please see Figure 1 and Figure 2 In one embodiment, the main control module 50 is also used to suppress its own listening to the AC component when the LED bead 10 is emitting light.
[0049] In this embodiment, for ease of program design, the slave-mode luminaire can also be configured such that: when the ambient light intensity is determined to be lower than a preset threshold based on the DC component, and the frequency of the received modulated light signal is determined to be within the deviation range of a preset modulation frequency based on the AC component, the LED driving circuit 20 is controlled to drive the LED beads 10 to modulate and emit light within a first preset time period according to the preset modulation frequency to provide illumination. In this case, to avoid the luminaire being affected by its own emitted modulated light information, the slave node luminaire can suppress its own receiving behavior while emitting modulated light, thus avoiding interference responses.
[0050] Similarly, the lights in the master and slave nodes can also suppress their receiving behavior while emitting modulated light to avoid generating interfering responses.
[0051] Please see Figure 2 In one embodiment of this application, in the main mode, the main control module 50 is further configured as follows: The preset control command is converted into a modulation waveform according to the preset digital encoding rules; the modulation waveform is generated based on the preset switching frequency, which is not lower than 100Hz. The control LED driving circuit 20 drives the LED lamp beads 10 to modulate and emit light within a first preset time period according to the modulation waveform, so as to provide illumination and broadcast a modulated light signal containing preset control instructions. In slave mode, the master control module 50 is configured as follows: When the frequency of the received modulated optical signal is determined to be within the deviation range of the preset switching frequency based on the AC component, the modulated optical signal is decoded to extract the control commands contained therein. When the extracted control command matches the preset control command, the control LED driver circuit 20 drives the LED beads 10 to emit light within a first preset time period to provide illumination.
[0052] In one embodiment, the preset digital encoding rules include at least one of on / off key control and Manchester encoding.
[0053] It should be noted that the basic principle of on / off key control is: the "on" state (lighting) of an LED represents binary "1"; the "off" state (not emitting light) of an LED represents binary "0" (or vice versa, depending on the protocol definition). The basic principle of Manchester encoding is: a forced level transition occurs in the middle of each bit cycle; binary "0": high level in the first half of the cycle (on), low level in the second half of the cycle (off); binary "1": low level in the first half of the cycle (off), high level in the second half of the cycle (on), and each bit contains one transition from on to off or from off to on.
[0054] It should be noted that if the content, format, or identifier of the decoded control command is consistent with the preset control command that is pre-stored or configured locally on the lamp, it is considered that the extracted control command matches the preset control command; otherwise, it is considered that they do not match.
[0055] In this embodiment, in master mode, the main control module 50 converts the preset control command into a modulated waveform according to the preset digital encoding rules (such as on / off key control or Manchester encoding), and controls the LED driving circuit 20 to drive the LED lamp beads 10 to modulate and emit light within a first preset time period at a switching frequency of not less than 100Hz, thereby providing illumination while broadcasting a modulated light signal containing the control command; in slave mode, the main control module 50 detects the AC component of the received modulated light signal and determines whether its frequency is within the allowable deviation range of the preset switching frequency. If so, the signal is decoded and verified to conform to the preset communication protocol format corresponding to the preset digital encoding rules. After successful verification, the LED lamp beads 10 are controlled to emit light. If the verification fails, it is considered that no valid visible light signal has been received.
[0056] Thus, this embodiment encodes the visible light signal in a high-frequency band with less ambient light interference, and combines it with a preset digital encoding rule that has self-synchronization, no DC component, and forced switching characteristics. This effectively suppresses interference such as power frequency noise, background light fluctuations, and signal baseline drift, and enhances the communication reliability and anti-interference capability of the lighting system in complex lighting environments.
[0057] Please see Figure 3 In one embodiment of this application, the light receiving module 40 includes: Photodiode D1 is used to receive ambient light and convert it into a current signal; The transimpedance amplifier circuit 41 has its input terminal electrically connected to the photodiode D1 and its output terminal connected to the main control module 50. The transimpedance amplifier circuit 41 is used to amplify the current signal and convert it into a voltage signal output. The voltage signal includes a DC component for characterizing ambient light intensity and an AC component for characterizing optical communication information.
[0058] In one embodiment, the transimpedance amplifier circuit 41 includes an operational amplifier OP, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, and a second capacitor C2. In this configuration, the non-inverting input terminal of the operational amplifier OP, the negative terminal of the photodiode D1, one end of the first resistor R1, and one end of the first capacitor C1 are connected. The inverting input terminal of the operational amplifier OP, one end of the second resistor R2, one end of the third resistor R3, and one end of the second capacitor C2 are connected. The other end of the second resistor R2, the first power supply terminal of the operational amplifier OP, and the power supply input terminal VCC1 of the transimpedance amplifier circuit 41 are connected. The output terminal of the operational amplifier OP, the other end of the first resistor R1, and the other end of the first capacitor C1 are connected to the main control module 50. The other end of the second capacitor C2, the other end of the third resistor R3, the second power supply terminal of the operational amplifier OP, and the negative terminal of the photodiode D1 are grounded.
[0059] In this embodiment, the transimpedance amplifier circuit 41 can improve the frequency response of the photodiode D1, thereby enabling it to receive high-frequency light information. During the communication process, the human eye cannot perceive any change in the brightness of the LED bead 10.
[0060] In this embodiment, the light receiving module 40 not only acts as a communication receiver to receive high-frequency modulated light signals from other lamps and convert them into electrical signals, which are then amplified and sent to the main control module 50 for decoding, but also functions as an ambient light sensor to detect the average intensity of ambient light. The main control module 50 can then determine whether it is day or night, thereby implementing an energy-saving strategy of "activating the human body sensing function only after dark." The transimpedance amplifier ensures that the module has a sufficiently high response speed to high-frequency light signals.
[0061] Specifically, the light receiving module 40 converts the received ambient light (including ambient light and high-frequency modulated light signals) into a weak photocurrent via a photodiode D1. This current is then converted to voltage and amplified by a transimpedance amplifier circuit 41, outputting a composite voltage signal. This voltage signal contains both a DC component (reflecting the average intensity of ambient light, used for illumination sensing) and an AC component (a high-frequency modulated component superimposed on the DC, carrying visible light communication information). The resistor and capacitor network in the transimpedance amplifier circuit 41 provides stable gain and bias. The main control module 50 can analyze the received voltage signal to extract the DC component representing the ambient light intensity and the AC component representing the optical communication information. Thus, this embodiment can reuse the photodiode D1 of the lighting system to receive communication information, eliminating the need for an additional communication module, saving circuit costs and reducing power consumption.
[0062] Please see Figure 4 In one embodiment of this application, the LED driving circuit 20 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a first switching transistor Q1; Among them, one end of the fourth resistor R4 is connected to the LED bead 10, the other end of the fourth resistor R4 is connected to the first end of the first switch Q1, the controlled end of the first switch Q1, one end of the fifth resistor R5 is connected to one end of the sixth resistor R6, the other end of the fifth resistor R5 is connected to the main control module 50, and the other end of the sixth resistor R6 and the second end of the first switch Q1 are grounded.
[0063] In this embodiment, the main control module 50 controls the switching frequency of the first switching transistor Q1 by outputting a control signal, thereby controlling the flashing frequency of the LED. The LED flashing frequency is not lower than 100Hz, which is almost imperceptible to the human eye, and the brightness is stable.
[0064] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. A lighting system, characterized in that, Includes multiple luminaires, which communicate with each other via visible light, each luminaire comprising: LED beads; An LED driving circuit is electrically connected to the LED beads and is used to drive the LED beads to emit light. The human body sensing module is used to detect human activity information in the area where the lamp is located and output corresponding human body sensing signals; A light receiving module is used to convert received light signals into electrical signals; wherein the electrical signals include a DC component for characterizing ambient light intensity and an AC component for characterizing optical communication information. The main control module is connected to the controlled terminal of the LED driving circuit, the signal output terminal of the human body sensing module, the controlled terminal of the human body sensing module, and the signal output terminal of the light receiving module. The main control module is configured with a master mode and a slave mode. In the main mode, the main control module is configured to: control the human body sensing module to stop working when the ambient light intensity is determined to be not lower than a preset threshold based on the DC component; control the human body sensing module to work when the ambient light intensity is determined to be lower than the preset threshold based on the DC component; and control the LED driving circuit to drive the LED beads to modulate and emit light within a first preset time period according to a preset modulation frequency when the presence of human activity is determined based on the human body sensing signal, so as to provide illumination and broadcast modulated light signals; wherein the preset modulation frequency is not lower than 100Hz; In the slave mode, the master control module is configured to: control the human body sensing module to stop working; when the ambient light intensity is determined to be lower than a preset threshold based on the DC component, and the frequency of the received modulated light signal is determined to be within the deviation range of the preset modulation frequency based on the AC component, control the LED driving circuit to drive the LED beads to emit light within the first preset time period to provide illumination.
2. The lighting system as described in claim 1, characterized in that, The main control module also has a preset master-slave mode, in which the main control module is configured as follows: When the ambient light intensity is determined to be no less than a preset threshold based on the DC component, the human body sensing module is controlled to stop working; when the ambient light intensity is determined to be less than the preset threshold based on the DC component, the human body sensing module is controlled to work, and when human body activity is determined to exist based on the human body sensing signal, the LED driving circuit is controlled to drive the LED beads to modulate and emit light within a first preset time period according to the preset modulation frequency, so as to provide illumination and broadcast modulated light signals; wherein, the preset modulation frequency is no less than 100Hz; When the ambient light intensity is determined to be lower than a preset threshold based on the DC component, and the received modulated light signal is determined to be within the deviation range of the preset modulation frequency based on the AC component, the LED driving circuit is controlled to drive the LED beads to modulate and emit light within a first preset time period according to the preset modulation frequency, so as to provide illumination and broadcast the modulated light signal.
3. The lighting system as described in claim 1 or 2, characterized in that, The main control module is also used to suppress its own listening to the AC component when the LED light bead is emitting light.
4. The lighting system as described in claim 1, characterized in that, In the main mode, the main control module is further configured as follows: The preset control command is converted into a modulation waveform according to a preset digital encoding rule; the modulation waveform is generated based on a preset switching frequency, which is not less than 100Hz. The LED driving circuit is controlled to drive the LED beads to modulate and emit light within a first preset time period according to the modulation waveform, so as to provide illumination and broadcast a modulated light signal containing the preset control command. In the slave mode, the master control module is configured as follows: When the frequency of the received modulated optical signal is determined to be within the deviation range of the preset switching frequency based on the AC component, the modulated optical signal is decoded to extract the control commands contained therein. When the extracted control command matches the preset control command, the LED driving circuit is controlled to drive the LED beads to emit light within the first preset time period to provide illumination.
5. The lighting system as described in claim 4, characterized in that, The preset digital encoding rules include at least one of on / off key control and Manchester encoding.
6. The lighting system as described in claim 1, characterized in that, The main control module has multiple preset modulation frequencies and their corresponding first preset time periods pre-stored. The multiple preset modulation frequencies are 8 kHz, 9 kHz, 10 kHz, 11 kHz, 12 kHz, 13 kHz, 14 kHz, 15 kHz and 16 kHz, and each preset modulation frequency corresponds to a first preset time period of different durations.
7. The lighting system as described in claim 1, characterized in that, The light receiving module includes: A photodiode is used to receive ambient light and convert it into an electrical signal. A transimpedance amplifier circuit is provided, wherein the input terminal of the transimpedance amplifier circuit is electrically connected to the photodiode, and the output terminal of the transimpedance amplifier circuit is connected to the main control module; the transimpedance amplifier circuit is used to amplify the current signal and convert it into a voltage signal output; the voltage signal includes a DC component for characterizing ambient light intensity and an AC component for characterizing optical communication information.
8. The lighting system as described in claim 7, characterized in that, The transimpedance amplifier circuit includes an operational amplifier, a first resistor, a second resistor, a third resistor, a first capacitor, and a second capacitor; In this configuration, the non-inverting input terminal of the operational amplifier, the negative terminal of the photodiode, one end of the first resistor, and one end of the first capacitor are connected; the inverting input terminal of the operational amplifier, one end of the second resistor, one end of the third resistor, and one end of the second capacitor are connected; the other end of the second resistor and the first power supply terminal of the operational amplifier are connected to the power supply input terminal of the transimpedance amplifier circuit; the output terminal of the operational amplifier, the other end of the first resistor, and the other end of the first capacitor are connected to the main control module; and the other end of the second capacitor, the other end of the third resistor, the second power supply terminal of the operational amplifier, and the negative terminal of the photodiode are grounded.
9. The lighting system as described in claim 1, characterized in that, The human body sensing module includes at least one of a passive infrared sensor, a reflective infrared sensor, a microwave sensing sensor, and a voice recognition module.
10. The lighting system as claimed in claim 1, characterized in that, The LED driving circuit includes a fourth resistor, a fifth resistor, a sixth resistor, and a first switching transistor; Wherein, one end of the fourth resistor is connected to the LED bead, the other end of the fourth resistor is connected to the first end of the first switching transistor, the controlled end of the first switching transistor, one end of the fifth resistor is connected to one end of the sixth resistor, the other end of the fifth resistor is connected to the main control module, and the other end of the sixth resistor and the second end of the first switching transistor are grounded.