A control method of a lamp system based on RGB wiring

Abstract

The application provides a control method of a lamp system based on RGB wiring, which upgrades the software in a light control module, outputs two groups of signals of a first PWM signal and a second PWM signal, controls the switching and change of the lamp respectively, realizes fixed power supply of the system by the stable second PWM signal, modulates the first PWM signal to control the switching device on the connection line to change the current between the load resistor, generates a digital signal, decodes the received control information matched with the lamp ID, adjusts the output current according to the control information, and completes the lamp control; the fixed power supply of the system guarantees the expansibility, and the lamp with the ID can be replaced to realize the control to the point, realize the control change of any one or more lamps, realize the upgrade of the light effect of the sold lamp system based on RGB wiring, and after the change, the signal transmission loop is changed from being directly connected with the RGB lamp to being connected with the load resistor, the load power is far less than the original light emitting power of the lamp, and the transmission efficiency of the system is improved.

Description

Technical Field

[0001] This invention belongs to the field of lighting technology, specifically relating to a control method for a lighting system based on RGB wiring. It is particularly suitable for traditional RGB four-wire PWM lighting systems, requiring only an upgrade to the existing software firmware. Background Technology

[0002] In the field of lighting control, traditional RGB four-wire PWM lighting systems are widely used. Four-wire RGB lighting control systems with driver capability use common cathode or common anode cables, eliminating the need for a connection line. In this system, the color lines of the lamps are directly connected to the controller's output signal lines to control the lamp colors. In such traditional RGB four-wire PWM lighting systems, the color-corresponding light control signals are typically generated by a combination of software and hardware. Because the controller's output signal lines are directly connected to the lamp color lines to control the lamp colors, multiple lamps connected to this system can only receive the same control information simultaneously and change color concurrently. Individual control of individual lamps within the system is not possible. Furthermore, since the RGB lines transmit PWM signals after controller processing—modulated color information without a fixed voltage output—system expansion becomes difficult.

[0003] As people's living standards improve, new requirements are being placed on the control effect of lighting fixtures. For traditional RGB four-wire PWM lighting systems that are already widely used in the market, it is unrealistic to abandon or directly change the traditional RGB four-wire wiring method of the lighting system in order to upgrade the control effect of the lighting fixtures. Now there is an urgent need to achieve the effect of lighting fixture control at specific points by only changing the software and lighting fixtures without changing the signal hardware and the original circuit structure of the traditional RGB four-wire PWM lighting system. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a control method for a lighting system based on RGB wiring. Without altering the signal hardware or original circuit structure of a traditional RGB four-wire PWM lighting system, only the software and the lighting fixtures need to be changed to achieve fixed power supply and transmission of encoded signals. By connecting addressable lighting fixtures to the existing circuitry, the effect of controlling the lighting fixtures to specific points can be achieved.

[0005] To achieve the above objectives, this invention provides a control method for a lighting system based on RGB wiring, comprising a lighting control module and several lighting fixtures. Each lighting fixture is assigned a specific ID and includes a decoding module and at least one color-emitting module. The lighting fixtures are connected to the lighting control module via three connections: A, B, and a positive power supply. A switching device is installed on each of the A and B connection lines, and a load resistor is installed between the A and B connection lines and the positive power supply connection line. The B connection is grounded. The lighting control module outputs a first PWM signal through the A connection and outputs a... The second PWM signal; wherein the first PWM signal is used to control the on / off duration of the switching devices on the A-line connection, generating high and low level changes across the load resistor on this line, the continuous high and low level changes forming a digital signal, the second PWM signal is used to control the normally closed switching devices on the B-line connection, ensuring a stable power supply environment for the entire system; after receiving the digital signal, the lamp obtains the control information belonging to its own lamp in the digital signal by matching ID, and after the decoding module completes the decoding, it controls the color light-emitting module by adjusting the current supplied to the color light-emitting module.

[0006] Furthermore, the digital signal includes a start marker signal, at least one ID, and matching luminance encoding information.

[0007] Furthermore, after the switch connected to the B circuit is closed, the decoding module, under a stable voltage environment, begins to read and obtain the preset start marker signal and the ID of the lamp.

[0008] Furthermore, the luminaire acquires control information from the digital signal, specifically including: the decoding module receiving the digital signal through the A-channel connection and scanning the digital signal to find the start marker signal; after the decoding module captures the start marker signal, it scans to find the ID of the luminaire; after the decoding module captures the ID of the luminaire, it begins to read the brightness encoding information belonging to the luminaire from the digital signal.

[0009] Furthermore, the brightness encoding information includes brightness information for controlling three sets of colors: red, green, and blue. The decoding module decodes the brightness encoding information and performs data logic calculations to form three sets of dimming PWM waves (R, G, and B) and outputs them to the color emission module.

[0010] Furthermore, the decoding module adjusts the input current corresponding to red, green, and blue light in the color light emission module by outputting the three sets of dimming PWM waves (R, G, and B), thereby controlling the brightness of the red, green, and blue light output by the color light emission module. Finally, the specific changes of the color light emission module are controlled by controlling the red, green, and blue light.

[0011] Furthermore, it also includes a main controller that is communicatively connected to the lighting control module, used to send mode control signals to the lighting control module; after receiving the mode control signals, the lighting control module converts and processes them to generate two sets of signals: a first PWM signal and a second PWM signal.

[0012] Furthermore, the second PWM signal is set to a stable level and does not change between high and low levels during the control process.

[0013] Furthermore, there is a C-path connection between the lamp and the lighting control module. The C-path connection is equipped with a switching device and a load resistor is provided between it and the positive power supply connection line. It outputs a third PWM signal that is in phase with the first PWM signal but has reversed high and low levels. The high and low levels of the load resistor on the A and C-path connection lines together form a differential digital signal, which is received by the lamp to control the lamp.

[0014] Furthermore, there is a C-path connection between the lamp and the lighting control module. The C-path connection is equipped with a switching device and a load resistor is provided between it and the positive power supply connection line. It outputs a fourth PWM signal. The fourth PWM signal is used to control the on and off duration of the switching device on the C-path connection line. The high and low level changes across the load resistor on this line, and the continuous high and low level changes constitute a second digital signal.

[0015] Compared to existing technologies, the advantages of this invention are as follows: This invention provides a control method for a lighting system based on RGB wiring. By upgrading the software program within the lighting control module, the input mode control signal is specifically parsed into a first PWM signal controlling the changes in the lighting fixture and a second PWM signal controlling the power supply of the lighting fixture, thereby achieving separate control of the lighting fixture's on / off state and changes. The second PWM signal maintains a stable level throughout the control process, achieving a fixed power supply for the entire system. The first PWM signal controls the on / off duration of the switching devices on its connection line, causing changes in the current across the load resistor on this connection line, generating a digital signal. The lighting fixture obtains its control information by matching its ID. After the decoding module decodes the control information, it adjusts the output current to control the color emission module. The implementation of a fixed power supply ensures system scalability. By simply replacing the existing wiring with new lighting fixtures bearing specific IDs, the effect of controlling the lighting fixtures to a specific point can be achieved. It can control and change any one or more lighting fixtures in the system, and upgrade the lighting effects of other commercially available RGB wiring-based lighting systems.

[0016] Without altering the signal hardware or original circuit structure of a traditional RGB four-wire PWM lighting system, the original system can transmit lighting control signals at 300Hz and 256 gray levels, achieving a signal transmission of at least 76.8K. After modification, the signal transmission loop is changed from being directly connected to the RGB lighting fixture to being connected to a load resistor. This load power is much lower than the original lighting fixture's output power, enabling the transmission of signals higher than 76.8K, thus improving the system's transmission efficiency. Attached Figure Description

[0017] Figure 1 This is a flowchart of the method of the present invention.

[0018] Figure 2 This is a schematic diagram of the system connection of the present invention.

[0019] Figure 3 This is a schematic diagram of the lighting control module of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the lamp of the present invention. Detailed Implementation

[0021] To provide a more detailed description of the present invention, the following description is provided in conjunction with the accompanying drawings. It should be noted that the embodiments described below are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] See Figure 2 , Figure 3 and Figure 4 This embodiment provides a lighting system based on RGB wiring that is controlled using the method of the present invention, including a main controller, a lighting control module and several lamps. Each lamp is assigned a specific ID and includes a decoding module and a color emission module.

[0023] The lighting control module is communicatively connected to the main controller via a communication cable. Alternatively, the main controller can also be wirelessly connected to the lighting control module.

[0024] The luminaire and the lighting control module are connected by three paths: A, B, and a positive power supply. The lighting control module can connect multiple luminaires in parallel simultaneously. Each of the A and B connection lines is equipped with a switching device, and a load resistor is installed between the A and B connection lines and the positive power supply connection line. The B connection line is grounded. In this embodiment, because the luminaire system adopts a common anode design, a pull-up load resistor is installed inside the luminaire. If the luminaire system adopts a common cathode design, a pull-down load resistor is installed inside the luminaire.

[0025] See Figure 1 A control method for a lighting system based on RGB wiring specifically includes the following steps:

[0026] The main controller sends a mode control signal to the lighting control module. After receiving the mode control signal, the lighting control module converts and processes it to generate two sets of signals: a first PWM signal and a second PWM signal.

[0027] The lighting control module outputs a second PWM signal through the B-channel connection. The second PWM signal is used to control the normally closed switching device on the B-channel connection line. Throughout the control process, the second PWM signal remains at a stable level without any high or low level changes, ensuring a stable power supply environment for the entire system.

[0028] The lighting control module outputs a first PWM signal via a connection A. This first PWM signal controls the on / off duration of the switching devices on the connection A line. The continuously varying high and low voltage levels across the load resistor on this line constitute a digital signal. This digital signal includes a start marker signal, at least one ID, and matching brightness encoding information. Both the start marker signal and the ID are pre-set as specific segments of digital signal, allowing for the numbering of lamps with different IDs, such as ID00, ID01, and ID02. Multiple lamps with the same ID can be connected to the same lighting system, enabling control of any one or more lamps within the system.

[0029] In this embodiment, after the switch connected to the B circuit is closed, the decoding module of the lamp begins to read and obtain the preset start mark signal and the ID of the lamp in a stable voltage environment.

[0030] Simultaneously, the decoding module receives the digital signal through the A-channel connection and scans the digital signal to find the starting marker signal; after the decoding module captures the starting marker signal, it performs a scan, and after the decoding module captures the ID of the lamp, it begins to read the brightness encoding information belonging to the lamp in the digital signal.

[0031] The brightness encoding information includes brightness information for controlling three sets of colors: red, green, and blue. The decoding module decodes the brightness encoding information and performs data logic calculations to form three sets of dimming PWM waves (R, G, and B) and outputs them to the color emitting module.

[0032] The decoding module adjusts the input current corresponding to red, green, and blue light in the color light emission module by outputting the three sets of dimming PWM waves (R, G, and B), thereby controlling the brightness of the red, green, and blue light output by the color light emission module. Finally, the specific changes of the color light emission module are controlled by controlling the red, green, and blue light.

[0033] There is also a C-path connection between the lamp and the lighting control module. The C-path connection is equipped with a switching device and a load resistor is set between it and the positive power supply line. For systems that need to ensure the accuracy of the system signal during long-distance transmission, the C-path connection outputs a third PWM signal that is in phase with the first PWM signal but has reversed high and low levels. The high and low levels of the load resistors on the A and C-path connections together form a differential digital signal, which is received by the lamp and used to control the lamp.

[0034] For systems with relatively large information transmission volumes, the C-channel connection can also output a fourth PWM signal. The fourth PWM signal is used to control the on / off duration of the switching devices on the C-channel connection line. The high and low levels across the load resistor on this line form a second digital signal. The second digital signal and the first digital signal simultaneously output control information with different IDs to the system to increase the amount of information transmitted by the system.

[0035] This invention provides a control method for a lighting system based on RGB wiring. By upgrading the software within the lighting control module, two sets of signals, a first PWM signal and a second PWM signal, are output to control the switching and changes of the lights, respectively. A stable second PWM signal ensures a fixed power supply for the system. The first PWM signal modulates the switching devices on its connection line, causing changes in the current across the load resistor, generating a digital signal. By decoding the received control information matching the light fixture's ID, the output current is adjusted accordingly to complete the lighting control. The fixed power supply ensures the system's scalability; simply replacing the light fixture with one that has an ID allows for point-to-point control, enabling the control of any one or more lights, thus upgrading the lighting effects of existing RGB wiring-based lighting systems. Furthermore, after the modification, the signal transmission loop is changed from being directly connected to the RGB light fixture to being connected to the load resistor. The power of this load is much smaller than the original light fixture's output power, improving the system's transmission efficiency.

[0036] The embodiments disclosed above are merely for illustrative purposes and should not be construed as limiting the scope of the invention. Therefore, any simple modifications or variations made in accordance with the claims of this invention are still within the scope of protection of this invention.

[0037] The scope of protection of this invention should be determined by the defined scope. For those skilled in the art, various improvements and modifications can be made without departing from the spirit and scope of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A control method for a lighting system based on RGB wiring, characterized in that, The system includes a lighting control module and several lamps. Each lamp has a specific ID and includes a decoding module and at least one color-emitting module. There are three connections between the lamps and the lighting control module: A, B, and a positive power supply. Each of the A and B connection lines is equipped with a switching device, and a load resistor is provided between the A and B connection lines and the positive power supply connection line. The B connection line is grounded. The lighting control module outputs a first PWM signal through connection A and a second PWM signal through connection B. The first PWM signal is used to control the on / off duration of the switching devices on the A-line connection, generating a continuous high-low level across the load resistor on this line. The high-low level constitutes a digital signal. The second PWM signal is used to control the normally closed switching devices on the B-line connection to ensure a stable power supply environment for the entire system. After receiving the digital signal, the luminaire obtains the control information belonging to its own luminaire from the digital signal by matching the ID. After the decoding module completes the decoding, it controls the color light-emitting module by adjusting the current supplied to the color light-emitting module. The digital signal includes a start marker signal, at least one ID, and matching brightness encoding information. After the switch connected to the B-channel is closed, the decoding module, under a stable voltage environment, begins to read and obtain the preset start marker signal and the ID of the lamp. Specifically, the lighting fixture acquires control information from the digital signal, including: The decoding module receives the digital signal through the A-channel connection and scans the digital signal to find the starting marker signal; After the decoding module captures the starting marker signal, it scans to find the ID of the lamp. After the decoding module captures the ID of the lamp, it begins to read the brightness encoding information belonging to the lamp in the digital signal. The brightness encoding information includes brightness information for controlling three sets of colors: red, green, and blue. The decoding module decodes the brightness encoding information and performs data logic calculations to form three sets of dimming PWM waves (R, G, and B) and outputs them to the color emitting module.

2. The control method for a lighting system based on RGB wiring according to claim 1, characterized in that, The decoding module adjusts the input current corresponding to red, green, and blue light in the color light emission module by outputting the three sets of dimming PWM waves (R, G, and B), thereby controlling the brightness of the red, green, and blue light output by the color light emission module. Finally, the specific changes of the color light emission module are controlled by controlling the red, green, and blue light.

3. The control method for a lighting system based on RGB wiring according to claim 2, characterized in that, It also includes a main controller that is communicatively connected to the lighting control module, used to send mode control signals to the lighting control module; after receiving the mode control signals, the lighting control module converts and processes them to generate two sets of signals: a first PWM signal and a second PWM signal.

4. A control method for a lighting system based on RGB wiring according to any one of claims 1 to 3, characterized in that, The second PWM signal is set to a stable level and does not change between high and low levels during the control process.

5. A control method for a lighting system based on RGB wiring according to any one of claims 1 to 3, characterized in that, There is also a C-path connection between the lamp and the lighting control module. The C-path connection is equipped with a switching device and a load resistor is provided between it and the positive power supply connection line. It outputs a third PWM signal that is in phase with the first PWM signal but has the high and low levels reversed. The high and low levels of the load resistor on the A and C-path connection lines together form a differential digital signal, which is received by the lamp to control the lamp.

6. A control method for a lighting system based on RGB wiring according to any one of claims 1 to 3, characterized in that, There is also a C-path connection between the lamp and the lighting control module. The C-path connection is equipped with a switching device and a load resistor is provided between it and the positive power supply connection line. It outputs a fourth PWM signal. The fourth PWM signal is used to control the on and off duration of the switching device on the C-path connection line. The high and low level changes across the load resistor on this line, and the continuous high and low level changes constitute a second digital signal.

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