一种用于CFL的镇流器驱动芯片设计

发布时间：2018-05-17 12:35

本文选题：紧凑型荧光灯 + 电子镇流器　；参考：《电子科技大学》2014年硕士论文

【摘要】：节能与环保越来越成为时代的主题,值得我们每个人去践行。照明与每个人的生活息息相关,高效节能的照明电光源在节能减排中有着举足轻重的地位,荧光灯就是其中使用最广泛的一种。本课题的目标是设计一款用于小功率紧凑型荧光灯(CFL)的镇流器驱动芯片,单片集成高压半桥功率管与低压控制电路,芯片内部产生低压控制电路所需电源,无需外接;具有扫频与辉光时间控制功能,为灯丝提供预热,缩短荧光灯辉光放电时间,延长荧光灯寿命;内置振荡电路,振荡频率可通过外接RC调节;具有死区时间控制电路,防止高、低端功率管同时导通;带脉冲下拉式电平移位的高端功率管驱动,可减小芯片的整体功耗。芯片的使用方便,仅需要外接少量元器件,就可用于驱动小功率紧凑型荧光灯。本文所作的主要工作包括:①分析了荧光灯的灯丝模型,介绍了电子镇流器各模块子电路的工作原理及典型电路实现。②给出了芯片的内部框图及典型应用电路,分析了芯片的工作原理,介绍了典型应用中元件器参数值选取的计算方法。③详细分析了芯片内部各个电路模块的工作原理,并给出了cadence下的仿真结果,其中包括:用于生成内部低压与其他模块所需偏置的VDD控制模块,用于预热灯丝与缩短辉光放电时间的扫频与辉光时间控制模块,振荡频率可调的RC振荡器模块,输出为振荡频率一半的、具有50%占空比方波的二分频模块,防止高低端功率管同时导通的死区时间控制模块,集脉冲产生电路、高压电平位移电路、方波逆变电路与输出级电路于一体的高端驱动模块。论文最后给出了芯片的整体电路与整体电路仿真结果,整体电路仿真结果显示输出满足电路的设计要求。
[Abstract]:Energy-saving and environmental protection are becoming the theme of the times, which is worth each of us to practice. Lighting is closely related to everyone's life. High efficiency and energy saving electric light source plays an important role in energy saving and emission reduction. Fluorescent lamp is one of the most widely used. The goal of this project is to design a ballast drive chip for low power compact fluorescent lamp (CFL), which integrates high voltage half bridge power tube and low voltage control circuit. It has the functions of frequency sweep and glow time control, provides preheating for filament, shortens glow discharge time of fluorescent lamp, prolongs fluorescent lamp life, built-in oscillation circuit, oscillation frequency can be adjusted by external RC, dead-time control circuit to prevent high, The low end power transistor is simultaneously switched on and the high end power tube driver with pulse-down level shift can reduce the overall power consumption of the chip. The chip is easy to use and can be used to drive compact fluorescent lamps. The main work of this paper includes: 1 analyzing the filament model of fluorescent lamp, introducing the working principle of each module sub-circuit of electronic ballast and realizing the typical circuit. 2. The internal block diagram and typical application circuit of the chip are given. This paper analyzes the working principle of the chip, introduces the calculation method of selecting the parameter value of the device in typical application. 3. The working principle of each circuit module inside the chip is analyzed in detail, and the simulation results under cadence are given. The invention comprises: a VDD control module for generating internal low voltage and bias required by other modules, a sweep and glow time control module for preheating filament and shortening glow discharge time, and a RC oscillator module with adjustable oscillation frequency. The output frequency is half of the oscillation frequency, and has a 50% duty cycle analogy wave, a dead time control module to prevent the high and low end power tube from conducting simultaneously, a set pulse generation circuit, and a high voltage flat displacement circuit. High end driving module of square wave inverter circuit and output stage circuit. At the end of the paper, the whole circuit and the whole circuit simulation results are given. The whole circuit simulation results show that the output meets the design requirements of the circuit.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM923.61

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