一款低成本LED照明驱动芯片研究与设计

发布时间：2018-06-27 10:48

本文选题：LED驱动 + BCD工艺　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：LED(Light Emitting Diode)是一种高效、耐用、安全的光源,随着全球能源危机,LED将逐步替代目前所使用的照明工具,它正引领人类进入又一次照明领域革命。LED驱动电源是LED照明的核心,其性能的优劣直接决定了照明灯具性能的好坏。随着LED照明产业在全球迅猛发展,市场对LED驱动电源提出了更多要求:如结构精简,控制简单,电路规模小等。所以,研究既能很好实现LED驱动又具有以上特点的驱动电源就具有重大意义。本文首先介绍了LED的基本特点,分析了LED市场发展现状及未来发展的趋势。然后分析了目前市场上主流的几种LED驱动方案,并在此基础上,选择出本文所采用的浮地式非隔离降压驱动。本文所设计的芯片采用华润上华第二代700V高压BCD工艺,芯片恒流采用逐周期限流的临界导通模式,控制简单,无需环路补偿。本文首先分析了芯片系统工作原理及具体的设计方法,根据制定的芯片电学参数完成了芯片内部各主要模块的设计,包括带隙基准、参考电压产生电路、峰值关断比较器和谷底导通检测比较器、LED开路保护和LED短路保护模块,同时进行了相关的说明和分析。最后,结合Cadence的Spectre仿真工具,对芯片各模块和整体电路进行了仿真和验证,仿真结果达到了预期设计目标和要求。本文所设计的芯片具有控制,启动和功率管三合一的特点。系统可靠性高,外围电路精简,可有效降低驱动电源的系统成本。因此,它是一款具有市场竞争力的LED驱动芯片。
[Abstract]:Led (Light emitting Diode) is an efficient, durable and safe light source. With the global energy crisis LED will gradually replace the current lighting tools, it is leading mankind into another lighting revolution. Led by LED driving power is the core of LED lighting. The quality of its performance directly determines the performance of lighting lamps. With the rapid development of LED lighting industry in the world, the market has put forward more requirements for LED driving power supply, such as simple structure, simple control, small circuit size and so on. Therefore, it is of great significance to study the LED drive and drive power supply with the above characteristics. This paper first introduces the basic characteristics of LED, analyzes the current situation of LED market and the trend of future development. Then, several mainstream LED driver schemes in the market are analyzed, and on this basis, the floating-ground non-isolated step-down drive is selected. The chip designed in this paper adopts the second generation 700V high voltage BCD process of China Resources China. The constant current of the chip adopts the critical conduction mode of limiting current by cycle. The control is simple and no loop compensation is needed. In this paper, the working principle of the chip system and the specific design method are analyzed. According to the electrical parameters of the chip, the main modules are designed, including the bandgap reference, the reference voltage generation circuit. The peak turn-off comparator and the trough bottom turn-on detection comparator have LED open circuit protection and LED short circuit protection module, and the related explanation and analysis have been carried out at the same time. Finally, combined with Cadence's Spectre simulation tool, the chip modules and the whole circuit are simulated and verified. The simulation results reach the expected design objectives and requirements. The chip designed in this paper has the characteristics of control, startup and power transistor. The system is reliable and the peripheral circuit is simple, which can effectively reduce the system cost of driving power supply. Therefore, it is a market-competitive LED driver chip.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM923.34

【引证文献】