本文關(guān)鍵詞： 電動(dòng)汽車 雙向 LLC諧振 PFM　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著電動(dòng)汽車技術(shù)的快速發(fā)展,能夠?qū)崿F(xiàn)功率雙向流動(dòng)的充電模塊在新能源等領(lǐng)域得到越來(lái)越廣泛的應(yīng)用。針對(duì)雙向充電模塊中的DC/DC部分,本文以Type-4型和Type-11型的諧振腔組合而成的雙向LLC諧振式變換器為研究與設(shè)計(jì)對(duì)象。本文基于對(duì)雙向LLC諧振式變換器工作狀態(tài)的分析,建立了穩(wěn)態(tài)模型,分析了諧振參數(shù)對(duì)變換器直流增益特性、諧振腔輸入阻抗特性的影響,求解出了諧振腔各狀態(tài)量的數(shù)學(xué)表達(dá)式,并分析得到了 MOSFET工作失效和實(shí)現(xiàn)ZVS軟開(kāi)關(guān)的條件。采用了擴(kuò)展函數(shù)描述分析法,建立了變換器的小信號(hào)模型系統(tǒng),重點(diǎn)分析了開(kāi)關(guān)頻率和負(fù)載變化對(duì)模型系統(tǒng)穩(wěn)定性與動(dòng)態(tài)響應(yīng)特性的影響,為補(bǔ)償器的參數(shù)設(shè)計(jì)提供了理論依據(jù)。根據(jù)電動(dòng)汽車技術(shù)指標(biāo),設(shè)計(jì)了變換器主功率電路并進(jìn)行損耗分析,為電路參數(shù)的進(jìn)一步優(yōu)化提供了參考依據(jù)。根據(jù)脈沖頻率調(diào)制(Pulse Frequency Modulation,PFM)原理,自主設(shè)計(jì)了一套硬件控制電路,并在電路中增加了軟啟動(dòng)電容,避免了在變換器啟動(dòng)時(shí)MOSFET進(jìn)入失效模式。在Saber仿真軟件中搭建雙向LLC諧振式變換器的仿真模型,對(duì)諧振參數(shù)和控制參數(shù)進(jìn)行了仿真分析與驗(yàn)證。并在此基礎(chǔ)上搭建了實(shí)驗(yàn)平臺(tái),對(duì)變換器在雙向運(yùn)行模式下的電壓電流波形以及效率進(jìn)行測(cè)試,驗(yàn)證了參數(shù)設(shè)計(jì)的合理性與有效性。
[Abstract]:With the rapid development of the electric vehicle technology, the charging module which can realize the bidirectional power flow has been more and more widely used in the field of new energy and so on. Aiming at the DC/DC part of the bidirectional charging module. In this paper, a bidirectional LLC resonant converter composed of Type-4 and Type-11 resonators is studied and designed. Based on the analysis of the operating state of the bidirectional LLC resonant converter. Analysis. The steady state model is established, and the influence of resonant parameters on DC gain characteristic and input impedance characteristic of resonant cavity is analyzed, and the mathematical expression of each state quantity of resonator is solved. The working failure of MOSFET and the condition of realizing ZVS soft switch are analyzed. The small signal model system of converter is established by using the method of extended function description. The influence of switching frequency and load on the stability and dynamic response characteristics of the model system is analyzed, which provides a theoretical basis for the parameter design of the compensator. The main power circuit of the converter is designed and the loss is analyzed. It provides a reference for the further optimization of circuit parameters, according to the pulse Frequency modulation principle of pulse frequency modulation. A set of hardware control circuit is designed, and the soft-start capacitor is added in the circuit. The failure mode of MOSFET is avoided when the converter is started, and the simulation model of bi-directional LLC resonant converter is built in the Saber simulation software. The resonant parameters and control parameters are simulated and verified. On this basis, an experimental platform is built to test the voltage and current waveform and efficiency of the converter in bi-directional operation mode. The rationality and validity of parameter design are verified.
【學(xué)位授予單位】：南京理工大學(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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