一个灵活的LED驱动汽车照明应用集成电路设计和实验特征 毕业设计文献翻译.doc
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1、 毕业设计文献翻译院系: 电子电气工程学院 学 号: 021309208 姓 名: 吴骁奕 指导教师: 曾国辉 完成时间: 2013/2/15 文献翻译021309208 吴骁奕A Flexible LED Driver for Automotive Lighting Applications: IC Design and Experimental Characterization一个灵活的LED驱动汽车照明应用:集成电路设计和实验特征AbstractThis letter presents a smart driver for LEDs, particularly摘要:这文章提出了一个智能驱
2、动发光二极管,for automotive lighting applications, which avoid ringing尤其是用于避免振荡和超调现象的汽车照明应用上,and overshoot phenomena. To this aim, advanced Soft Start and为了这个目的,在芯片上集成了优化软启动和电流升降控制技术。Current Slope Control techniques are integrated on-chip. This letter这篇文章讨论了设计于集合于高电压的互补金属氧化半导体上的驱动技术,discusses the driver d
3、esign integrating in high voltage CMOStechnology, the digital circuitry for programming and electronic用于编程和电子控制单元连接的数字电路以及功率元件提高到10瓦特。control units interfacing, and the power devices up to 10W. Experimental同时也展示了不同功率等级使用的发光二极管和与不同类型的连接时的实验特征。characterizations with LEDs of different power levels andw
4、ith different types of connections are showed. The smart driver这个智能的驱动适用于可调节的温度和电压需求。sustains automotive temperature and voltage requirements; moreover此外,它有很高的功率效率,它是可编程的,还可以配置用于线性的调节器。it has high power efficiency, it is programmable, and can beconfigured to work as a linear regulator (for low curre
5、nt LEDs) orin switch mode (for higher power LEDs).(用于弱电流发光二极管)或转换模式(用于高功率发光二极管)IndexTermsAutomotive electronics, high voltage (HV)CMOS,integrated circuit (IC), LED driver.关键词汽车用电子设备,高电压互补金属氧化物半导体,集成电路LED驱动I. INTRODUCTION1:介绍IN the last few years LED technology experienced a very fast在过去的几年中,发光二极管技术在
6、汽车照明应用中替代普通灯泡经历了一个非常快速的进步时代,and important growth, superseding the bulb technology inautomotive lighting applications 1. To achieve the harsh requirementof CO2 emission and reduce the fuel consumption,car manufacturer must reduce the total power consumption. The为了实现了严格的二氧化碳排放要求和降低了燃料的消耗,汽车制造商必须减少总的功率
7、消耗。adoption of LEDs in place of bulbs permits to have about fivetimes less power consumption at equal output lighting intensity.采用发光二极管代替灯泡在同等输出功率照明强度下损耗将降低五倍。LEDs have reached quality and reliability factors that permittheir use in automotive harsh environment and in addition发光二极管已达到质量和可靠性因素,可保证他们可
8、使用在汽车的严酷环境下并且他们的成本是降低的。their cost is decreasing. However, LEDs are pretty difficult to事实上,发光二极管是很难驱动,因此相比较普通灯泡,发光二极管驱动要求更多的技巧和控制功能。drive and therefore LED-drivers require many tricks and controlfunctions compared to bulb drivers. Moreover, automotive而且,汽车应用程序需要紧凑和低成本的解决方案,灵活足够的数字电子控制单元界面, applicatio
9、ns require compact and low-cost solutions, flexibleenough to be interfaced to digital electronic control units (ECU)and to cope with different wiring configurations and relevant同时需要应付不同的布线配置和相关拓展。parasitics 2. Automotive lighting systems should be also robust汽车照明系统也应该对电磁干扰(EMI)和超温、过流以及过电压现象有应变能力。wit
10、h respect to electromagnetic interference (EMI) andto overtemperature, overcurrent, and overvoltage phenomena,such as those due to ringing effects generated by resonance of例如那些由于激振效应所产生的共振的线电感和连接器电容。wire inductance and connector capacitance. Usually, in car environment通常,在汽车环境中,几米长电线使用,就会生成强烈振荡。few
11、meters long wires are used, generating dumpedoscillations. Such oscillations and the associated overcurrentand overvoltage levels reduce the LED life time and its efficiency这种振荡和与之相关的过电流和过电压会降低发光二极管寿命及其效率。3. To avoid or limit these effects the LED cannot bedriven by a mechanical relay but a smart dr
12、iver is required tocontrol the slope of the LED current during transient, keeping it为了避免或限制这些影响发光二极管不能由一个机械继电器控制但智能的驱动被要求需要在瞬态控制LED电流的斜率,以保持它在电线的特征频率以下。below the characteristic frequency of the wire. A compact andefficient LED driver is needed, overcoming the above issues andfeaturing a high flexibi
13、lity to face different LED power levels,一个紧凑和高效的LED驱动程序是必要的,是为了克服上述问题和具有高灵活性,去面对不同的发光二极管功率级别,连接拓扑和电线寄生。connections topology, and wiring parasitics. Hereafter, Section此后,在第二部分,分析了振荡和电磁干扰在放光二极管驱动中的影响。II analyzes ringing and EMI problems in LED driving. SectionIII presents the design of the new LED sma
14、rt driver focusing on第三部分介绍了一款新设计的智能发光二极管驱动的显著特征。its distinguishing features. Section IV presents its experimental第四部分介绍了发光二极管在不同功率等级下的实验特征,从几十毫瓦特characterization with LEDs of different power levels, from tensof milliwatts to several watts, used stand-alone, or connected in到几瓦特在独立或几个连接下的状态。strings.
15、Temperature and voltage range operating conditions are温度和电压等级的工作条件也被测量判断。also measured. Conclusions are drawn in Section V.第五部分将引出结论。II. RINGING AND EMI PROBLEMS IN LED DRIVING二.振荡和电磁干扰在发光二极管驱动中的影响At state-of-the-art LED, driving is implemented using lowdropout linear regulators, which are limited t
16、o LEDs of few tensof milliamperes, or more power-efficient switching solutions athigher current levels 在最开始的LED,开车是使用低输出线性稳压器,仅限于几十毫安级的发光二极管,或更省电转换解决方案用在更高的电流水平。310. However, a compact solution integrating然而,一个紧凑的集成解决方案在一个单芯片数字ECU接口,on a single chip a digital ECU interface, a low-powerconfigurable l
17、ogic core, a power part able to work in linear modeor switching one, as well as advanced techniques such as SoftStart and Current Slope Control, has not been proposed yet in一个低功耗可配置的逻辑核心,电源部分能够工作在线性模式或转换它,以及先进的技术,如软开始和电流升降调节,还没有在文献中被提出。the literature. The main difficulties in the design of a univers
18、al设计一个足够的灵活的发光二极管驱动应用在不同的接线配置最大的难题是振荡和电磁干扰问题。LED driver, flexible enough to be applied to different wiringconfigurations, are the ringing and EMI issues. These problems这些问题取决于环境因素和寄生组件,这些因素很难去假设和模仿。depend on environmental and parasitic components that are difficultto predict and simulate.While bulbs
19、 are easily modeled as而电灯泡却很容易模仿因为它有线性的正温度系数并且寄生成分对它的影响比较小。linear positive temperature coefficient (PTC) resistors, and areless sensitive to parasitic components, a LED is a special diode发光二极管是一种特殊的二极管,它满足肖克利指数电流-电压法。and follows the Shockley exponential IV law. A very smallfluctuation on the voltage
20、 across the LED can generate a very一个很小的电压起伏通过发光二极管可能引起一个很大的电流变化影响。high variation on its current affecting, as proved in 3, both efficiency经证明,效率和照明设备的寿命都将被影响。and life time and creating lighting disturbs. This behavior如果发光二极管没有恰当的被驱动的话这个行为会导致振荡和高强度的电流尖脉冲。can generate ringing and high current spikes
21、if the LED is not properly driven. By the same token, a bulb-designed driver, as出于同样的原因,灯泡的驱动,正如10-12中说的,不能被直接用于驱动发光二极管。shown in 1012, cannot be directly used to drive efficientlyLEDs. This is particularly true when the LED and the driver are这一点是完全正确的当发光二极管和驱动在汽车连接中被几米的电缆分割的时候。separated by a few met
22、er cables as in automotive connections.In this case, the wiring parasitics can generate ringing and EMI.出于这个原因,电线的寄生将引起振荡和电磁干扰。A comparison based on experimental measurements, between一个在二瓦特的灯泡和0.1瓦特的连着很短的线(大概10厘米长)发光二极管的比较实验中显示在图1和图2中。a 2-W bulb lamp and a 0.1-W LED turn-on transient with veryshort
23、wire (about 10 cm long) and with very long wire (about3m long) is shown, respectively, in Figs. 1 and 2. A simplerelay is used as a switch to highlight the different behavior一个简单的继电器被用来切换到这些负载不同的状态。of those loads. Those pictures show the necessity of using a这些图片展示了使用一个设计良好的LED驱动从而避免寄生电路的重要性。well-des
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