本文選題：LED驅(qū)動(dòng)電源 + 高功率因數(shù)��； 參考：《江蘇大學(xué)》2017年碩士論文

【摘要】：發(fā)光二極管(Lighting Emitting Diode,LED),具有亮度高,功率低,使用壽命長(zhǎng)等優(yōu)點(diǎn)。LED照明的發(fā)展依賴于LED驅(qū)動(dòng)電源技術(shù)的成熟與進(jìn)步。功率因數(shù)和輸出紋波是衡量LED驅(qū)動(dòng)電源性能好壞的重要指標(biāo)。為了提高功率因數(shù)和降低輸出紋波,本文對(duì)級(jí)聯(lián)式LED驅(qū)動(dòng)電源做了一些研究。首先介紹了LED驅(qū)動(dòng)電源的研究背景及意義,闡述了LED的發(fā)光原理與特性。根據(jù)國(guó)內(nèi)外參考文獻(xiàn),分別歸納分析了高功率因數(shù)和低輸出紋波LED驅(qū)動(dòng)電源的研究現(xiàn)狀。深入研究了級(jí)聯(lián)式LED驅(qū)動(dòng)電源,以基于二次型Buck變換器的LED驅(qū)動(dòng)電源為例,詳細(xì)分析了主電路的工作模態(tài)與工作特性,對(duì)主電路參數(shù)進(jìn)行了優(yōu)化設(shè)計(jì)。通過(guò)PSIM仿真驗(yàn)證了理論分析的正確性。其次,提出了一種新型基于二次型Buck變換器的交錯(cuò)并聯(lián)LED驅(qū)動(dòng)電源,利用交錯(cuò)并聯(lián)技術(shù),優(yōu)化了原有二次型Buck變換器的拓?fù)浣Y(jié)構(gòu),降低了開關(guān)器件的電壓電流應(yīng)力,減小了輸出紋波。在不同開關(guān)占空比的條件下,分析了主電路的工作模態(tài)。詳細(xì)分析了主電路的工作特性,為主電路參數(shù)設(shè)計(jì)提供了依據(jù)。通過(guò)PSIM對(duì)理論分析進(jìn)行了仿真驗(yàn)證。然后,針對(duì)基于二次型Buck變換器的交錯(cuò)并聯(lián)LED驅(qū)動(dòng)電源存在輸入電流過(guò)零死區(qū)的問(wèn)題,提出了一種新型基于Buck-boost級(jí)聯(lián)二次型Buck的交錯(cuò)并聯(lián)LED驅(qū)動(dòng)電源。通過(guò)共用一個(gè)開關(guān)管,在原有拓?fù)浣Y(jié)構(gòu)的基礎(chǔ)上級(jí)聯(lián)了一個(gè)Buck-boost電路。詳細(xì)分析了主電路的工作模態(tài)、中間儲(chǔ)能電容電壓特性、電感工作在電流斷續(xù)模式的條件和開關(guān)頻率特性。利用Buck-boost電路的特性,基本解決了輸入電流過(guò)零死區(qū)的問(wèn)題,改善了輸入電流總諧波畸變率,使功率因數(shù)近似為1。最后,針對(duì)所提出的基于Buck-boost級(jí)聯(lián)二次型Buck的交錯(cuò)并聯(lián)LED驅(qū)動(dòng)電源設(shè)計(jì)制作了實(shí)驗(yàn)樣機(jī)。為了主電路開關(guān)器件的選型,分析計(jì)算了主電路開關(guān)器件的最大電壓電流應(yīng)力。詳細(xì)設(shè)計(jì)了控制電路及驅(qū)動(dòng)隔離電路。通過(guò)實(shí)驗(yàn),得出的結(jié)果與理論分析基本一致,再次證明了理論分析的正確性。
[Abstract]:Light emitting Diode (LED) has the advantages of high brightness, low power and long service life. The development of LED lighting depends on the maturity and progress of LED driving power technology. Power factor and output ripple are important indexes to measure the performance of LED drive power supply. In order to improve the power factor and reduce the output ripple, the cascade LED drive power supply is studied in this paper. Firstly, the research background and significance of LED driving power are introduced, and the principle and characteristics of LED are expounded. According to the references at home and abroad, the research status of high power factor and low output ripple LED driver is summarized and analyzed respectively. The cascade LED driving power supply is deeply studied. Taking the LED drive power supply based on the quadratic Buck converter as an example, the working modes and working characteristics of the main circuit are analyzed in detail, and the main circuit parameters are optimized. The theoretical analysis is verified by PSIM simulation. Secondly, a novel interleaving parallel LED driving power supply based on secondary Buck converter is proposed. The topology of the original secondary Buck converter is optimized by using the staggered parallel technology, and the voltage and current stress of the switching device is reduced. The output ripple is reduced. The operating modes of the main circuit are analyzed under different duty cycle conditions. The working characteristics of the main circuit are analyzed in detail, and the design basis of the main circuit parameters is provided. The theoretical analysis is verified by PSIM. Then, a novel Buck-boost cascaded parallel LED driver based on Buck-boost cascade is proposed to solve the problem of zero-crossing dead time of input current in the interleaved parallel LED driving power supply based on quadratic Buck converter. By sharing one switch, a Buck-boost circuit is cascaded on the basis of the original topology. The operating mode of the main circuit, the voltage characteristics of the intermediate energy storage capacitor, the condition of the inductor working in the current intermittent mode and the switching frequency characteristics are analyzed in detail. By using the characteristics of Buck-boost circuit, the problem of zero crossing dead time of input current is basically solved, the total harmonic distortion rate of input current is improved, and the power factor is approximately 1. Finally, an experimental prototype is developed for the design of an interleaved parallel LED driver based on Buck-boost cascade secondary Buck. In order to select the switch devices of the main circuit, the maximum voltage and current stress of the switch devices of the main circuit is analyzed and calculated. Control circuit and drive isolation circuit are designed in detail. The experimental results are basically consistent with the theoretical analysis, and the correctness of the theoretical analysis is proved again.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM46

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