Research On KNX Bus Based Lighting Control System For Energy Saving Applications

KNX Bus technology is an effective control technology to improve lighting environment for the office and home of buildings,which was widely used in architectural lighting systems.KNX technology was formerly EIB protocol and originated in Europe in 1990,by simplifying the seven-layers specification of ISO/OSI(ISO7489)to Physical Layer,Data Link Layer,Network Layer,Transport Layer and Application Layer.KNX enables to realize automatic control of the building and achieve the energy-saving effect of the lighting system,by connecting the functional equipments of the building system to form a KNX communication control system and adopting certain control methods.Nowadays,to research and design KNX technology has still high application value for promoting the popularization of the KNX technology in China.On one hand,it can not only save the electric energy of urban building lighting.On the other hand,it promotes the development of building construction in modern cities and smart home construction in the future.This study proposes a solution to improve the office lighting system based on the three major requirements of KNX technology for building lighting systems,such as Functional requirement,Humanize requirement and Energy-saving requirement,by taking the office environment lighting system as the research object which is based on the actual work.The study mainly has designed a communication control system which is based on KNX bus technology and the full understanding of the KNX protocol model and communication mechanism.This system enable to realize the automatic switching,dimming and scene control according to changes in the office environment.Generally,the design of KNX bus equipment adopts the BCU + AM structure model,and the KNX protocol stack(system program)has been fixed in the ROM space of the BCU during design.However,the developers reserved a programmable EEPROM,so that users can develop and design the corresponding AM application module AP user applications according to actual needs,and to achieve corresponding control functions basing on the fully grasping the KNX protocol model and communication mechanism.This study aims to design the KNX sensor acquisition board and actuator driver board based on the BCU communication module,according to the system's realization goals.Among them,the study aims to select ATMega64 Mi-controller as the BCU communication control module of the two function boards,and select NCN5120 as the bus transceiver module of the sensor acquisition board,select FZE1066 as the bus transceiver module of the actuator driver board,select BH1750 FVI as the acquisition circuit control chip,and select GL8211 as thePWM dimming driver circuit control chip,and to realize the corresponding control function through programming the AP application program and using ETS software to debug.Finally,the study enables the commissioned function board to the lighting system of actual office environment,successfully realizing automatic lighting switching,dimming control,and to collect lighting data for energy research.By mainly grasping lighting energy efficiency calculation methods and energy saving control methods,the study designs A Fuzzy BP neural network control algorithm for energy-saving control and energy efficiency analysis of lighting systems.