發(fā)布時間：2019-04-16 09:32

【摘要】：寬增益直流變換器在新能源發(fā)電、電動汽車車載充電機、通信電源等電源系統(tǒng)中有著廣泛的應(yīng)用。與常規(guī)寬增益諧振變換器相比,多諧振變換器僅在傳統(tǒng)LLC諧振腔增加了一個陷波器,具有結(jié)構(gòu)簡單、易于實現(xiàn)等優(yōu)點。將陷波器放在變換器原邊,本文首先對LCLCL變換器進行研究,分析了變換器的工作原理,利用基波分析法研究了變換器的增益特性。分析得出,LCLCL變換器不僅能實現(xiàn)寬增益,還可利用三次諧波傳遞功率,具有內(nèi)在的緩啟與短路保護能力等優(yōu)點。為了實現(xiàn)變換器的高效率,本文分析了諧振網(wǎng)絡(luò)參數(shù)對變換器的影響,從效率最優(yōu)的角度確定參數(shù)優(yōu)化設(shè)計目標,并在此基礎(chǔ)上研究了參數(shù)優(yōu)化設(shè)計方案。文中以3.3kW樣機為例給出了詳細參數(shù)設(shè)計流程,并進行了實驗驗證,實驗結(jié)果證明了理論分析和參數(shù)設(shè)計的正確性。為了適應(yīng)于低壓輸入高壓輸出場合,本文對LCLCL變換器進行了改進,將陷波器放在變換器副邊,提出了五元件LLC-LC多諧振變換器拓撲。與LCLCL變換器相比,該變換器提高了諧振點的增益,降低了陷波器上的導(dǎo)通損耗。本文對其原理與增益特性進行了詳細分析,討論了與LCLCL變換器特性上的異同點,給出了關(guān)鍵參數(shù)設(shè)計考慮,并搭建了400W樣機平臺進行實驗驗證。為了對比兩個變換器,制作并調(diào)試了一臺規(guī)格參數(shù)完全相同的LCLCL變換器樣機,實驗結(jié)果表明,在升壓場合,LLC-LC變換器更具有優(yōu)勢。
[Abstract]:Wide-gain DC-DC converter is widely used in power supply systems such as new energy generation, on-board charger of electric vehicles, communication power supply and so on. Compared with the conventional wide-gain resonant converter, the multi-resonant converter only adds a notch filter to the traditional LLC resonant cavity, which has the advantages of simple structure and easy realization. The notch filter is placed on the original side of the converter. Firstly, the LCLCL converter is studied, the working principle of the converter is analyzed, and the gain characteristics of the converter are studied by the fundamental analysis method. It is concluded that the LCLCL converter can not only realize wide gain, but also make use of the third harmonic to transfer power. It has the advantages of inherent slow-start and short-circuit protection. In order to realize the high efficiency of the converter, this paper analyzes the influence of the resonant network parameters on the converter, determines the optimization design objective of the parameters from the angle of optimal efficiency, and studies the parameter optimization design scheme on the basis of this. Taking the 3.3kW prototype as an example, the detailed flow chart of parameter design is given and verified by experiments. The experimental results show that the theoretical analysis and parameter design are correct. In order to adapt to the low voltage input and high voltage output, the LCLCL converter is improved in this paper. The notch filter is placed on the secondary side of the converter, and a five-element LLC-LC multi-resonant converter topology is proposed. Compared with the LCLCL converter, the converter improves the gain of the resonant point and reduces the on-off loss of the notch filter. In this paper, the principle and gain characteristics of the converter are analyzed in detail, and the similarities and differences with LCLCL converter are discussed. The design consideration of key parameters is given, and a 400W prototype platform is set up for experimental verification. In order to compare the two converters, a prototype of LCLCL converter with the same specifications and parameters has been fabricated and debugged. The experimental results show that the LLC-LC converter has more advantages in the boost case.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TM46

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