Design Of An Emergency Lighting IC And Applications

The emergency lighting is widely used in public buildings and has a promising future. Today, most of the emergency lightings are consisted of independent devices. The chips of some design houses can't reach all the requirements of the national standard. It is necessary and significant to study the emergency lighting IC. The emergency lighting IC in this thesis is for the application of self-powered emergency lighting. There are two thrusts in the design of the emergency lighting IC: design of the circuit and layout of the emergency lighting IC, and construct the application systems of the emergency lighting IC.In this thesis, the features of the emergency lighting system have been firstly introduced in respect of the background of the application of the emergency lighting. Based on the national standard GB17945-2000, the feasibility of the design targets of the chip in relation to the updated technology has been analyzed; the overall scheme and the function blocks of the emergency lighting IC have been designed. There are seven function blocks: pre-regulation, regulation, battery-detection, emergency-transition, lamp-controlling, fault-display, charge-controlling.Secondly, the function and the circuit of each block is analyzed, the concrete circuits and the simulation results of the key circuits have been provided. The emphasis is put on the regulation and the charge-controlling blocks. Based on the design of the structure for device, the internal HV-NMOS, ESD protection and the layout of the chip have been designed.Thirdly, the application systems of the emergency lighting IC have been constructed. There are two typical application systems: emergency-lighting (discontinuous lighting) and emergency-signal (continuous lighting). The working law of the systems and the parameters of the outdoors key devices have been demonstrated.The emergency lighting IC designed in this thesis reach all the requirements of the national standard for the emergency lightings and need few outdoors devices, so it keep ahead in the technical level in China.