本文關(guān)鍵詞： 電動汽車 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】：隨著電動汽車技術(shù)的快速發(fā)展,能夠?qū)崿F(xiàn)功率雙向流動的充電模塊在新能源等領(lǐng)域得到越來越廣泛的應(yīng)用。針對雙向充電模塊中的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)計對象。本文基于對雙向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)表達式,并分析得到了 MOSFET工作失效和實現(xiàn)ZVS軟開關(guān)的條件。采用了擴展函數(shù)描述分析法,建立了變換器的小信號模型系統(tǒng),重點分析了開關(guān)頻率和負載變化對模型系統(tǒng)穩(wěn)定性與動態(tài)響應(yīng)特性的影響,為補償器的參數(shù)設(shè)計提供了理論依據(jù)。根據(jù)電動汽車技術(shù)指標,設(shè)計了變換器主功率電路并進行損耗分析,為電路參數(shù)的進一步優(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)計了一套硬件控制電路,并在電路中增加了軟啟動電容,避免了在變換器啟動時MOSFET進入失效模式。在Saber仿真軟件中搭建雙向LLC諧振式變換器的仿真模型,對諧振參數(shù)和控制參數(shù)進行了仿真分析與驗證。并在此基礎(chǔ)上搭建了實驗平臺,對變換器在雙向運行模式下的電壓電流波形以及效率進行測試,驗證了參數(shù)設(shè)計的合理性與有效性。
[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)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM46

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