Design Of An Intelligent OLED Lighting System Using Power Line Communication

With people’s living standards continuously improving, the lighting requirementof people was longer than just to get certain brightness. The intelligent, artisticlighting gradually comes into public view. Due to the economic development of ourcountry is mainly relying on the high-energy products and the energy utilization isvery poor, energy shortages and inadequate supply of electricity in our country isserious. This has profound effects on the normal development of our country andpeople’s daily living. In addition, people take many different measures to deal withenergy issues and environmental pollution. Lighting consumes a significant part of allelectrical energy consumed. It is very necessary to implement energy-saving measuresin the lighting field.Organic Light-Emitting Diode (OLED) has many advantages such as highefficiency, glare-free area light source, light weight, reach color and can be made onflexible substrates, at the same time compared with LED it is no heat problem. Insteadof filament lamp, efficient light-bulb and high intensity discharge lamp, OLED is apromising candidate for the next-generation indoor lighting.Power line communication has many advantages such as not re-wiring, lessinvestment, simple construction, easy to extend, manage and maintain. At the sametime it doesn`t produce electromagnetic radiation. Those make it an ideal choice forindoor intelligent lighting. With the development of technology, the obstacles whichhinder the development of power line communication have been overcome. Thestability of communication has also been improved.In this paper, we designed an intelligent OLED lighting system using the powerline communication. This system consists of many OLED lighting nodes. All of those OLED lighting nodes are connected together through the power lines. Each OLEDlighting node contains five parts: power line communication module, microprocessorunit, sensors module, constant current power supply module and OLED. MCUAT89C52from ATMEL Corporation is selected as the microprocessor unit in thissystem. ST7538by ST Microelectronics Inc. is the core device of the power linecommunication module, which is used to realize the communication between differentnodes. The illuminance sensor ISL29003by Intersil Americas Inc. is used in thissystem. It can detect the ambient illumination timely, and sends the data to the MCU.In order to improve the accuracy and reliability of power line communication，CSMA/CD(Carrier Sense Multiple Access/Collision Detect) protocol is utilized viaST7538and improved1-persistent CSMA algorithm. Then we develop thecommunication system frame structure and complete the power line communicationtransmission and reception program, the illumination detection program, the maincontrol program.Finally, the experiment shows that the power line can stably realize thecommunication within300meters and the intelligent dimming program using PIDproportional algorithm can complete the automatic adjustment of the illuminancewithin80Ms. The steady state error doesn’t exceed1%.