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

【摘要】：在節(jié)能以及環(huán)保的大勢(shì)所趨下,發(fā)光二極管(LED)照明應(yīng)運(yùn)而生。LED燈以其較高的光效、非常長(zhǎng)的壽命、越來(lái)越低的價(jià)格以及精美的外形,逐漸進(jìn)入了人們的視野。從2013年開(kāi)始,LED燈的市場(chǎng)異�；馃�。當(dāng)然,競(jìng)爭(zhēng)也是異常激烈的。為了能夠在激烈的競(jìng)爭(zhēng)中勝出,更高的性能及可靠性以及更低的價(jià)格受各個(gè)廠商所追求。目前LED燈珠的價(jià)格已經(jīng)很低,繼續(xù)降價(jià)的空間非常有限。因此,想要降低LED燈具的價(jià)格,最容易實(shí)現(xiàn)的方法是通過(guò)LED的驅(qū)動(dòng)電路入手。在保證驅(qū)動(dòng)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(jiǎn),從而降低成本已經(jīng)成為大勢(shì)所趨。傳統(tǒng)的LED驅(qū)動(dòng)電路是以AC-DC芯片為基礎(chǔ),將外圍應(yīng)用電路針對(duì)LED負(fù)載的特性稍作調(diào)整以后直接作為其驅(qū)動(dòng)電路來(lái)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(yīng)用環(huán)境,而且其成本又極為高昂。其成本一方面來(lái)源于過(guò)于復(fù)雜的外圍應(yīng)用電路,另一方面,芯片的許多功能沒(méi)有得到充分利用。除了成本較高以外,傳統(tǒng)的LED驅(qū)動(dòng)芯片由于沒(méi)有針對(duì)LED照明應(yīng)用進(jìn)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(dòng)的發(fā)展方向,在保證驅(qū)動(dòng)精度和可靠性基礎(chǔ)上,提出了一種專門為L(zhǎng)ED照明而定制的開(kāi)關(guān)型驅(qū)動(dòng)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(dòng)的負(fù)載的特性的基礎(chǔ)上,介紹了各種開(kāi)關(guān)變換器的基本原理。針對(duì)LED對(duì)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(guò)LED的電流。通過(guò)對(duì)整體環(huán)路的穩(wěn)定性分析與設(shè)計(jì),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(dá)到±3%的輸出電流精度。完善的保護(hù)電路,如過(guò)壓保護(hù),過(guò)流保護(hù)以及過(guò)溫保護(hù)等,保證了在各種復(fù)雜環(huán)境下工作的安全性。此外,在XD1413的設(shè)計(jì)過(guò)程中還著重考慮了電磁干擾的影響,通過(guò)使其內(nèi)部的振蕩器的頻率隨時(shí)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(diǎn)上,使得在外圍應(yīng)用的設(shè)計(jì)過(guò)程中,更容易滿足電磁兼容的要求。XD1413的設(shè)計(jì)是基于1μm 5V/20V/500V的BCD工藝完成的,采用Hspice仿真工具,對(duì)其功能與指標(biāo)進(jìn)行了仿真驗(yàn)證。通過(guò)對(duì)仿真結(jié)果的分析,驗(yàn)證了XD1413在極為精簡(jiǎn)的外圍應(yīng)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(dá)到了設(shè)計(jì)目標(biāo)。
[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(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM923.34

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相關(guān)期刊論文 前1條

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

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本文編號(hào)：1850276