1 system structure and composition According to the topology of the network, the intelligent lighting control system has the following two types: bus type and hybrid type based on star structure. They have their own characteristics. The former is more flexible, easy to expand, relatively independent in control, and low in cost. The latter has high reliability, simple fault diagnosis and elimination, simple access protocol, and high transmission speed. The general intelligent lighting control system is a digital lighting management system, which consists of a system unit, an input unit and an output unit. In addition to the power supply unit, each unit is set to a unique unit address and its function is set by software. Each load circuit is controlled by an output unit, and the various forms of the unit are briefly described as follows: (1) System unit: used to provide working power, source system clock and various system interfaces, including system power, various interfaces (PC, Ethernet, telephone, etc.), network bridge. The main system implements the same control and signal sampling network for each area; the subsystem implements different specific control networks for each partition. The main system and the subsystem are connected by means of information and other components to realize data transmission. (2) Input unit: used to convert external control signals into signals transmitted on the network; such as programmable multi-function (on/off, dimming, timing, soft start/soft shutdown, etc.) input switch, infrared receiving switch And infrared remote control (for light dimming or on/off function). Various types and multi-function control panels (if some provide LCD page display and control mode, and use soft keys for graphics, text and pictures, multi-point control, timing control, storage of multiple bright modes, etc.) Various functional sensors (such as infrared sensors can sense human activities to control the switch of lamps or other loads, brightness sensors), adjust the brightness of the light source by detecting the brightness of the surrounding environment, and maintain the appropriate illumination of the surrounding environment. Achieve effective use of natural light and save energy. (3) Output unit: The output unit of the intelligent control system is used to accept signals transmitted from the network and control the output of the corresponding loop to realize real-time control. The output unit has various types of relays. The dimmer (with the load current as the adjustment target, in addition to the dimming function, can also be used as the soft start of the lamp, soft off) analog output unit, lighting dimming interface, infrared output module and so on. The system generally adopts the centralized control and management, decentralized execution mode, that is, the central monitoring center and the intelligent control lighting cabinet are configured. The former has a control computer, a main communication controller and the like, and is used for controlling and managing the entire system through the network. The control command is communicated with the programmable controller of each intelligent control cabinet, and the automatic and manual working state, the on/off state of the lamp, etc. from the programmable controller in the intelligent control cabinet are received, and the processing is taken under abnormal conditions. Measures. 2 system functions The current intelligent control system has the following functions: (1) The intelligent system is equipped with a central monitoring device to centrally monitor the entire system to adjust the on-site effect of the lighting at any time. For example, the system sets the lighting scheme mode, and simulates the lighting fixture layout on the computer screen to display the lighting groups. Turn on mode and on/off status. (2) It has the functions of abnormal startup and automatic protection of lamps; (3) It has the function of starting time of lamps, accumulating records, and the statistical function of lamp life; (4) In the case of power failure, it has automatic switching of two-way power receiving cabinets. The function of the emergency lighting group is activated; (5) The system is provided with an automatic/manual switching switch to manually operate the opening and closing of each lamp group when necessary. (6) System settings interface with other systems, such as building building automation system (BA system), to improve the overall management level. (7) It has the functions of scene preset, brightness adjustment, timing, timing control, soft start and soft shutdown. With the further development and improvement of intelligent systems, its functions will be further enhanced. 3 use effect The overall effect of using an intelligent lighting control system is as follows: (1) Realize the humanization of lighting. Since different areas have different lighting quality requirements, it is required to adjust the control illumination to implement various control schemes such as scene control, timing control, and multi-point control. The flexible performance of the program modifications and changes further ensures the quality of the lighting. (2) Improve management level. Turning the switching of traditional switch-controlled lighting fixtures into intelligent management, so that high-quality management awareness is applied to the system to ensure the quality of lighting. (3) Saving energy. The intelligent sensor is used to sense the outdoor brightness to automatically adjust the light to maintain a constant illumination in the room, which can not only achieve the best lighting environment in the room, but also achieve energy saving effect. Illumination setting is carried out according to the working conditions of each area, and the lighting is automatically turned on and off on time, so that the system can save energy to the utmost. (4) Extend the service life of the lamp. As we all know, the service life of lighting fixtures depends on the grid voltage. As the grid overvoltage is higher, the lamp life will be reduced exponentially. On the contrary, the lamp life will be extended exponentially. Therefore, preventing overvoltage and appropriately reducing the operating voltage is prolonged. An effective way to extend the life of the luminaire. The system is set up to suppress grid surge voltage and surge voltage devices and artificially limit the voltage to increase lamp life. Soft start and soft turn-off technology are adopted to avoid thermal shock of the filament of the lamp to further extend the life of the lamp. 4 design examples Taking the design of Huizhou Dongjiang Xuefu Stadium as an example, according to the development of sports in the university, various lighting fixtures of the stadium have designed the lighting scheme according to different requirements to adapt to different needs of different environments and achieve different lighting effects. There are color TV broadcast mode, football match mode, football training mode, art performance mode, cleaning mode, etc., and can be edited according to user needs. The entire site has a total of 204 sets of 2000W, 80 sets of 400W metal halide lamps, controlled by six power distribution cabinets scattered in the main stadium lighting control room. The entire control system adopts centralized control and management, and decentralized execution, namely the central monitoring center (upper level) and the intelligent lighting control cabinet (lower level). The monitoring center can control and manage the entire site lighting, and communicate with the programmable lighting controllers in each intelligent lighting control cabinet. On one hand, the relevant control commands are transmitted over the bus and sent to the programmable controllers in the lighting control cabinets of each area to receive the relevant control commands; on the other hand, the programmable controllers from the lighting control cabinets of the various regions are received. Upward forwarding of signals related to automatic or manual status, turning lights on or off, etc. (In case of high requirements, you can also check the status and fault conditions of each lamp, count the working hours of the lamps, and check each lamp. The accumulated running time, before the large-scale competition, the census will be carried out, and the lamps that have reached the service life will be replaced in time.) Through the classification process, the parameters are displayed on the computer screen, and the abnormal situation is prompted. It can be interfaced with other BA systems. The intelligent lighting control cabinet is specifically executing various control commands issued by the monitoring center computer to control the lighting of the venue to turn on the lights in different modes to meet the requirements of various sports competitions or activities, and to patrol the signals of the switch state parameters of the lighting circuit. . For the site lighting, in addition to the control on the computer in the monitoring center, the manual button grouping operation and control can be performed on the control cabinet on the site. The lighting system of the stadium is operated by the mode set by the intelligent control system, which can reduce unnecessary power consumption and reduce the operation and maintenance costs. By automatically adjusting the sequence of the opening of the venue lights, the lighting can be consciously avoided. The starting current is too large, and the interval between the restart of the Metal Halide Lamp can be limited, which greatly increases the life of the lamp; these can save the user money and create conditions for recovering the cost as soon as possible. The stadium itself has many lines and complicated functions. By adopting the intelligent lighting control system, the line can be simplified, the consumption of wires and cables can be saved, thereby reducing investment, shortening the construction period, and reducing the maintenance and management costs, which brings great convenience to the construction. 5 Conclusion The use of intelligent control systems in the design, the advantages are summarized as follows: (1) Using advanced power electronics technology to conduct centralized monitoring and remote control tasks, and optimize energy utilization, save energy and reduce operating costs. (2) According to the user's requirements and the expansion of the lighting area, only the software settings need to be modified, and the lighting layout and expansion functions can be adjusted without modifying the existing lines. This will reduce the expansion costs and renovation schedule. (3) When the power is off and the power supply is restored, the system will resume normal operation according to the preset state, achieving unattended operation and improving management level. (4) The setting of the optimal operation mode of lighting will extend the service life of the lamp, thereby reducing the maintenance workload and equipment cost. (5) The control loop is separated from the load loop, and the control loop uses a low voltage to ensure personal safety.
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