發(fā)布時(shí)間：2018-04-01 06:23

  本文選題：大功率　切入點(diǎn)：EMI濾波器　出處：《華南理工大學(xué)》2014年碩士論文

【摘要】：LED作為新一代綠色照明光源，以其高效率、低功耗、長(zhǎng)壽命、更環(huán)保、可調(diào)性好等優(yōu)勢(shì)，在關(guān)注資源能源節(jié)約的今天，在照明領(lǐng)域占據(jù)著越來(lái)越重要的地位。隨著LED照明應(yīng)用的日益廣泛和深入，突顯出了各種亟待解決的問(wèn)題。本文針對(duì)目前LED照明驅(qū)動(dòng)電源的大功率化困難、EMC特性不理想、智能化應(yīng)用不足這三個(gè)技術(shù)難點(diǎn)，針對(duì)大功率LED照明的新型驅(qū)動(dòng)電源進(jìn)行研究，以尋求解決這三個(gè)技術(shù)難點(diǎn)的有效途徑，，驗(yàn)證大功率LED智能照明的可行性，幫助LED大功率照明產(chǎn)品進(jìn)一步推廣和應(yīng)用。 本文以給出新型大功率LED照明驅(qū)動(dòng)電源研究意義開(kāi)始，介紹了LED照明驅(qū)動(dòng)電源的發(fā)展現(xiàn)狀和趨勢(shì)，就LED照明驅(qū)動(dòng)需要具體考慮的問(wèn)題進(jìn)行分析，得出本設(shè)計(jì)的基本方向。圍繞驅(qū)動(dòng)電源的電磁兼容特性進(jìn)行專(zhuān)門(mén)的EMI濾波器設(shè)計(jì)和性能仿真，設(shè)計(jì)了一個(gè)對(duì)電磁干擾吸收能力很強(qiáng)的前置EMI濾波器，對(duì)共模或差模干擾信號(hào)的插入損耗在一定范圍內(nèi)達(dá)到100dB。本文重點(diǎn)針對(duì)大功率LED照明的要求，設(shè)計(jì)了一款基于SSL1750T控制芯片和MBI1802恒流調(diào)光驅(qū)動(dòng)芯片的大功率LED驅(qū)動(dòng)電源。電源電路包含了反激式拓?fù)浣Y(jié)構(gòu)變換和有源功率因素校正，輸出最大功率可達(dá)120W，提供四個(gè)LED連接回路，并且提供LED的PWM調(diào)光方式，可調(diào)光范圍為0%~100%。 另外，根據(jù)實(shí)際應(yīng)用需求設(shè)計(jì)了針對(duì)大功率LED照明驅(qū)動(dòng)電源實(shí)時(shí)調(diào)光和散熱的控制電路，以單片機(jī)為處理器的控制電路實(shí)現(xiàn)了根據(jù)環(huán)境背景光的不同而自動(dòng)改變照明等級(jí)，同時(shí)在電源內(nèi)部過(guò)熱時(shí)啟動(dòng)散熱風(fēng)扇。最后，基于以上的設(shè)計(jì)進(jìn)行PCB的打樣和新型大功率LED驅(qū)動(dòng)電源的實(shí)物制作，通過(guò)電路的調(diào)試最終完成了一套大功率LED照明驅(qū)動(dòng)電源的設(shè)計(jì)制作，通過(guò)實(shí)驗(yàn)測(cè)試，電源的最高效率可達(dá)87.31%，功率因素可達(dá)97.5%，設(shè)定LED驅(qū)動(dòng)電流的靈敏度高。
[Abstract]:As a new generation of green lighting light source, LED has the advantages of high efficiency, low power consumption, long life, more environmental protection, good tunability and so on. Nowadays, LED is playing a more and more important role in the field of lighting.With the wide application of LED lighting, various problems need to be solved.In this paper, aiming at the three technical difficulties of LED lighting driving power supply, such as the difficulty of high power conversion and the shortage of intelligent application, the new driving power supply for high power LED lighting is studied.In order to find an effective way to solve these three technical difficulties, to verify the feasibility of high-power LED intelligent lighting, and to help LED high-power lighting products to be further promoted and applied.At the beginning of this paper, the research significance of new high power LED lighting driving power supply is given, the development status and trend of LED lighting driving power supply are introduced, the problems that need to be considered in LED lighting drive are analyzed, and the basic direction of this design is obtained.A special EMI filter design and performance simulation is carried out around the EMC characteristics of the driving power supply, and a prefabricated EMI filter is designed, which has a strong absorption ability to electromagnetic interference (EMI).The insertion loss of common-mode or differential mode interference signals is 100 dB in a certain range.In order to meet the requirements of high power LED lighting, a high power LED driver based on SSL1750T control chip and MBI1802 constant current dimming driver is designed in this paper.The power circuit includes flyback topology conversion and active power factor correction, the maximum output power can be up to 120W, four LED connection circuits are provided, and the PWM dimming mode of LED is provided. The adjustable light range is 0 and 100.In addition, according to the practical application requirements, the control circuit for the real-time dimming and heat dissipation of the high-power LED illumination driving power supply is designed. The control circuit based on single-chip microcomputer can automatically change the lighting level according to the different background light of the environment.At the same time, when the power source is overheated, start the cooling fan.Finally, based on the above design, the PCB proofing and a new type of high-power LED driving power supply are made. Finally, a set of high-power LED lighting driver power supply is designed and manufactured through the circuit debugging, and the experimental test is carried out.The maximum efficiency of power supply can reach 87.31 and the power factor can reach 97.5. the sensitivity of setting LED drive current is high.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM923.34

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