本文選題：LED照明 + 非隔離�。� 參考：《西安電子科技大學》2014年碩士論文

【摘要】：在節(jié)能以及環(huán)保的大勢所趨下,發(fā)光二極管(LED)照明應運而生。LED燈以其較高的光效、非常長的壽命、越來越低的價格以及精美的外形,逐漸進入了人們的視野。從2013年開始,LED燈的市場異�；馃帷．斎�,競爭也是異常激烈的。為了能夠在激烈的競爭中勝出,更高的性能及可靠性以及更低的價格受各個廠商所追求。目前LED燈珠的價格已經(jīng)很低,繼續(xù)降價的空間非常有限。因此,想要降低LED燈具的價格,最容易實現(xiàn)的方法是通過LED的驅(qū)動電路入手。在保證驅(qū)動電路的可靠性的前提下,將外圍電路與芯片內(nèi)部電路盡可能的精簡,從而降低成本已經(jīng)成為大勢所趨。傳統(tǒng)的LED驅(qū)動電路是以AC-DC芯片為基礎(chǔ),將外圍應用電路針對LED負載的特性稍作調(diào)整以后直接作為其驅(qū)動電路來使用。這種方法不僅體積大,在空間有限的燈殼內(nèi)很難安裝,限制了其應用環(huán)境,而且其成本又極為高昂。其成本一方面來源于過于復雜的外圍應用電路,另一方面,芯片的許多功能沒有得到充分利用。除了成本較高以外,傳統(tǒng)的LED驅(qū)動芯片由于沒有針對LED照明應用進行專門定制,其安全性也值得商榷。本篇論文首先介紹了LED照明驅(qū)動的發(fā)展方向,在保證驅(qū)動精度和可靠性基礎(chǔ)上,提出了一種專門為LED照明而定制的開關(guān)型驅(qū)動控制芯片XD1413。然后從發(fā)光二極管的發(fā)光原理出發(fā),給出了發(fā)光二極管的等效結(jié)構(gòu)。在了解了我們需要驅(qū)動的負載的特性的基礎(chǔ)上,介紹了各種開關(guān)變換器的基本原理。針對LED對電流的大小極為敏感的特性,XD1413采用了恒流控制的方法,精確地控制流過LED的電流。通過對整體環(huán)路的穩(wěn)定性分析與設(shè)計,保證了在85V AC~265V AC的超大輸入電壓范圍內(nèi),系統(tǒng)都能達到±3%的輸出電流精度。完善的保護電路,如過壓保護,過流保護以及過溫保護等,保證了在各種復雜環(huán)境下工作的安全性。此外,在XD1413的設(shè)計過程中還著重考慮了電磁干擾的影響,通過使其內(nèi)部的振蕩器的頻率隨時間周期性的變化,將某一頻率下的電磁干擾能量均勻地分布到一定范圍內(nèi)的頻率點上,使得在外圍應用的設(shè)計過程中,更容易滿足電磁兼容的要求。XD1413的設(shè)計是基于1μm 5V/20V/500V的BCD工藝完成的,采用Hspice仿真工具,對其功能與指標進行了仿真驗證。通過對仿真結(jié)果的分析,驗證了XD1413在極為精簡的外圍應用電路以及內(nèi)部結(jié)構(gòu)的前提下,具備極高的精度以及安全性,達到了設(shè)計目標。
[Abstract]:Under the trend of energy saving and environmental protection, light emitting diode (LED) lighting emerges as the times require.LED light with its higher light efficiency, very long life, lower price and exquisite shape, and gradually entered people's vision. Since 2013, the market of LED lamps is very hot. Of course, the competition is also very intense. In order to be able to be excited In the fierce competition, higher performance, reliability and lower prices are pursued by various manufacturers. At present, the price of LED beads is very low and the space for continuing reduction is very limited. Therefore, the easiest way to reduce the price of LED lamps is to start with the drive circuit of the LED. On the premise, it has become the general trend to reduce the peripheral circuit and the internal circuit of the chip, thus reducing the cost. The traditional LED drive circuit is based on the AC-DC chip, and then uses the peripheral application circuit for the LED load to be used directly as its driving circuit. This method is not only large in volume, but also in space. The limited lamp housing is difficult to install, and its application environment is limited, and its cost is very high. On the one hand, the cost is derived from the overly complex peripheral application circuit. On the other hand, many functions of the chip are not fully utilized. Besides the high cost, the traditional LED drive chip has not been specially designed for the LED lighting application. This paper first introduces the direction of the development of LED lighting drive. On the basis of ensuring the precision and reliability of the drive, a switch type drive control chip XD1413. specially designed for LED lighting is put forward, and then the equivalent junction of the LED is given from the light emitting principle of the light emitting diode. On the basis of understanding the characteristics of the load we need to drive, the basic principles of various switching converters are introduced. In view of the very sensitive characteristics of LED to the size of the current, XD1413 uses a constant current control method to accurately control the current flowing through the LED. By analyzing and designing the stability of the whole ring road, the 85V AC~ is guaranteed. In the ultra large input voltage range of 265V AC, the system can reach an output current precision of up to 3%. Perfect protection circuits, such as overvoltage protection, overcurrent protection and over temperature protection, ensure the safety of working in various complex environments. In addition, the influence of electromagnetic interference is considered in the design of XD1413, through which it is made inside. The frequency of the oscillator changes with time periodically. The electromagnetic interference energy at a certain frequency is evenly distributed to the frequency point within a certain range, which makes the design of the electromagnetic compatibility more easy to meet the requirement of electromagnetic compatibility in the design process of the peripheral application. The design of.XD1413 is based on the BCD process of 1 m 5V/20V /500V, and uses the Hspice simulation worker. The function and index are simulated and verified. Through the analysis of the simulation results, it is proved that XD1413 has very high precision and security on the premise of extremely streamlined peripheral application circuit and internal structure, and achieves the design goal.

【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM923.34

【參考文獻】

相關(guān)期刊論文 前1條

1 姚博;于海勛;王耀文;;基于跨導放大器的電流模式積分單元的設(shè)計[J];現(xiàn)代電子技術(shù);2012年02期

，

本文編號：1850276