發(fā)布時(shí)間：2018-06-09 22:35

  本文選題：LLC諧振變換器 + 損耗計(jì)算�。� 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：隨著電力電子技術(shù)的飛速發(fā)展,高輸入電壓、大變比、高開(kāi)關(guān)頻率的變換器已經(jīng)廣泛應(yīng)用到各個(gè)領(lǐng)域。同時(shí),由于LLC諧振變換器在提高開(kāi)關(guān)頻率、減小開(kāi)關(guān)應(yīng)力和開(kāi)關(guān)損耗、提高變換器效率等方面的明顯優(yōu)勢(shì),使用性廣和發(fā)展空間大,因此使其成為了研究熱點(diǎn)之一。本文是基于四變壓器輸入串聯(lián)輸出并聯(lián)LLC諧振變換器電路,以高壓輸入低壓輸出的實(shí)際應(yīng)用為背景,對(duì)變換器主要元器件的損耗進(jìn)行詳細(xì)分析,給出損耗數(shù)學(xué)模型,并通過(guò)平面變壓器的優(yōu)化設(shè)計(jì)減少損耗,提高變換器效率。首先,利用電磁場(chǎng)仿真軟件ANSYS Maxwell和ANSYS Simplorer對(duì)四變壓器輸入串聯(lián)輸出并聯(lián)LLC電路及其中的平面變壓器進(jìn)行3D建模和仿真。完成平面變壓器的優(yōu)化設(shè)計(jì)工作,對(duì)四種對(duì)稱(chēng)交疊結(jié)構(gòu)的PCB銅繞組進(jìn)行比較分析,根據(jù)電流密度和銅損的仿真結(jié)果,得到最優(yōu)的交錯(cuò)并聯(lián)PCB繞組;對(duì)四種結(jié)構(gòu)不同的磁芯結(jié)構(gòu)進(jìn)行比對(duì)分析,根據(jù)磁場(chǎng)分布和鐵損的仿真結(jié)果,得到最優(yōu)的中柱雙氣隙磁芯。其次,文中在變換器損耗構(gòu)成分析計(jì)算的基礎(chǔ)上,利用ANSYS Q3D對(duì)寄生參數(shù)進(jìn)行提取,并通過(guò)分析各個(gè)寄生參數(shù)對(duì)變換器的影響進(jìn)行相關(guān)的優(yōu)化,并完成對(duì)結(jié)果的驗(yàn)證。最后,通過(guò)一臺(tái)輸入800V-1000V,輸出25V的4kWDC/DC變換器,對(duì)文中理論計(jì)算和仿真分析進(jìn)行驗(yàn)證,證明理論分析的正確性及仿真模型的研究意義,同時(shí)證明了本文所采用的效率提升措施的有效性。
[Abstract]:With the rapid development of power electronics technology, high input voltage, large conversion ratio and high switching frequency converters have been widely used in various fields. At the same time, the LLC resonant converter has many advantages, such as increasing the switching frequency, reducing the switching stress and loss, and improving the efficiency of the converter, so it has become one of the research hotspots. This paper is based on the input series output parallel LLC resonant converter circuit of four transformers. Based on the practical application of high voltage input and low voltage output, the loss of the main components of the converter is analyzed in detail, and the mathematical model of loss is given. Through the optimization design of the plane transformer, the loss is reduced and the efficiency of the converter is improved. Firstly, the electromagnetic field simulation software ANSYS Maxwell and ANSYS Simplorer are used to model and simulate the input and output parallel LLC circuits of four transformers and their planar transformers. The optimization design of planar transformer is completed. Four kinds of symmetrical overlapping structure of PCB copper windings are compared and analyzed. According to the simulation results of current density and copper loss, the optimal staggered parallel PCB windings are obtained. Four magnetic core structures with different structures are compared and analyzed. According to the simulation results of magnetic field distribution and iron loss, the optimal medium column double air gap core is obtained. Secondly, based on the analysis and calculation of converter loss composition, the parasitic parameters are extracted by ANSYS Q3D and optimized by analyzing the influence of each parasitic parameter on the converter, and the results are verified. Finally, a 4kW DC / DC / DC converter with an input of 800V-1000V and an output of 25V is used to verify the theoretical calculation and simulation analysis, which proves the correctness of the theoretical analysis and the significance of the research on the simulation model. At the same time, the effectiveness of the efficiency improvement measures adopted in this paper is proved.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM46

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本文編號(hào)：2001059