Research On Intelligent Street Lamp System Based On Ad-hoc

Intelligent control technology becomes more extensive with the development of semiconductor technology and the intelligent technology.Intelligent control technology is particularly prominent in semiconductor lighting applications.Street lighting level is an important indicator of the development of a city,but street lighting electricity accounts for a large part of the overall electricity consumption.Most of the current street lighting is the overall control mode,and the invalid lighting time is so long in this control method.The road pedestrians are scarce from AM 0:00 to AM 5:00,but the street lamp is always in the on state in these time,it wasted a lot of energy.And the grid will fluctuate because the city electricity consumption is so less in the middle of the night.It will leads to high voltage on both ends of the street lighting lamps.The high voltage not only increase the energy consumption but also reduces the life of lighting lamps.We designed an intelligent control of the street light system to active the action with trigger base on this point.The key technologies of intelligent lighting system are mainly concentrated in internet technology,wireless sensor technology,ZigBee technology,etc.The intelligent street lamp system designed in this thesis could achieve the action wiht trigger,so it used ad-hoc technology.The intelligent street lamp system could achieve network control,and improve the lighting management system.It could shorten invalid lighting time to reduce the consumption of electrical energy.Ad-hoc is a network with self-organization and self-adaptability.The network could communicate with other node anytime or anywhere and allows the network node to set up the network spontaneously.The network nodes not only receive and transmit data,but also it could select route and forward data.The ad-hoc doesn't need construction of infrastructure,could cut the cost of building the network,so we select the ad-hoc as our network of our intelligent street lamp system.The system built an ad-hoc network with the self-healing function by using ZigBee coordinator and ZigBee router equipment.And the ZigBee device select the TI company's CC2530 as the main control chip.The street lamp terminal's signal acquisition module and street lamp drive module as the keys of design.The signal acquisition module consists of a set of light detectors and three sets of infrared detectors,four sets of detectors form a three-stage discriminating circuit.Four sets of detectors meet the lighting requirements at the same time,it will send a lighting request to the processor.It will issues instructions to the street lamp drive circuit to open the street light switch,after the processor receives the request.The design could be used at the midnight when the human traffic is low.Turn on the light when the people pass,turn off the light after the people go away.We used a joint dimming mode considering the current single dimming methods are inadequate status quo.The dimming method combines the advantages of analog dimming and PWM dimming.It not only ensure the stability of color temperature,but also make the light efficiency at a high level.And the thesis set up a piecewise function model according to the relationship between the luminous flux and the forward current.The segmentation function could be as a quantitative basis for light efficiency compensation.The experimental results show that the thesis designed intelligent street light system can achieve the effect of trigger control and it could achieve the purpose of energy conservation.