线性恒流LED驱动芯片的设计与研究

发布时间：2018-02-05 01:57

本文关键词： 分段线性 LED 驱动温度补偿线电压补偿　出处：《华南理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：LED作为新一代绿色光源,是当前照明领域研究热点,随着LED应用越来越广泛,市场也对LED应用提出了低成本、高效率、高PF值、易于调光等要求。随着研究的深入,LED驱动方式越来越多样化,性能越来越优良。近年来,分段线性恒流LED驱动技术迅速发展,显示了极大的应用价值。本文在现有单开关线性恒流LED驱动技术基础上进行改进,提出了高阶分段线性恒流LED驱动电路结构,基于0.35um线宽700V高压BCD工艺,设计了一款LED驱动芯片。本文深入地研究了各种LED驱动技术,确定了高阶分段线性恒流LED驱动方式。然后研究了芯片的整体架构,并设计了带温度补偿的带隙基准电路,可在不增加电路结构复杂度的前提下,使过温保护效果更好;同时设计了带线电压补偿的参考源电路,可有效抑制压闪,使得功率在一定电压范围内基本保持不变。本文基于设定指标,对整体电路进行设计分析、仿真验证,同时进行版图设计和后仿真,并且对样片进行了测试。实际测试结果表明:芯片驱动功率达到20W,驱动效率达到95%,相比现有芯片分别提高了25%、10%;同时在保证PF值为0.85基础上,有效改善了压闪,使得每10V功率变化小于0.1W。测试表明本文研究的线性恒流LED驱动芯片在多项性能指标上超越了传统的AC/DC开关电源和分段线性恒流驱动芯片。
[Abstract]:As a new generation of green light source, LED is the research hotspot in the field of lighting. With the increasing application of LED, the market has put forward low cost, high efficiency and high PF value for LED applications. With more and more diversified driving modes and better performance, the piecewise linear constant current (LED) drive technology has developed rapidly in recent years. This paper improves the single switch linear constant current LED driver technology and proposes a high order piecewise linear constant current LED drive circuit structure. Based on the 0.35um line width 700V high voltage BCD process, a LED driver chip is designed. In this paper, various LED driver technologies are deeply studied. The high-order piecewise linear constant-current LED drive mode is determined. Then the overall architecture of the chip is studied and the bandgap reference circuit with temperature compensation is designed which can not increase the complexity of the circuit structure. The effect of over-temperature protection is better; At the same time, the reference source circuit with linear voltage compensation is designed, which can effectively suppress the flashover and make the power remain basically unchanged in a certain voltage range. Based on the set index, the whole circuit is designed and analyzed in this paper. Simulation verification, layout design and post-simulation, and the sample is tested. The actual test results show that the chip drive power up to 20W, driving efficiency of 95%. Compared with the existing chips, the two chips are increased by 25% and 10% respectively; At the same time, on the basis of ensuring PF value of 0.85, the flashover can be improved effectively. The test results show that the linear constant current LED driver chip studied in this paper is superior to the traditional AC/DC switching power supply and piecewise linear constant current drive core in many performance indexes. A film.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM923.34;TN402

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