發(fā)布時(shí)間：2018-08-21 14:20

【摘要】：目前國內(nèi)航空電源系統(tǒng)主要采用低壓28V直流電源供電,近年來國外航空飛機(jī)逐漸采用270V高壓直流電源(HVDC)供電代替了低壓直流電源供電。航空高壓電源系統(tǒng)具有電能傳輸效率高、重量輕等優(yōu)勢,因此已逐漸成為航空電源系統(tǒng)的主流發(fā)展趨勢。其中二次電源直接面向機(jī)載用電設(shè)備,其性能影響整個(gè)航空電源系統(tǒng)品質(zhì),而當(dāng)前國內(nèi)有關(guān)航空270V高壓直流電源二次轉(zhuǎn)換技術(shù)研究不多。本論文以航空高壓直流電源系統(tǒng)中二次電源DC/DC變換器作為研究對象,針對二次電源高功率密度、高可靠性等要求,設(shè)計(jì)了二次電源DC/DC變換器。主要內(nèi)容為:1.探討了航空電源系統(tǒng)的發(fā)展過程,分析了高壓直流電源系統(tǒng)的優(yōu)勢及其二次電源中DC/DC變換器的發(fā)展趨勢,深入研究了蒙特卡羅法及其在電力電子場合中的應(yīng)用。2.設(shè)計(jì)了二次電源DC/DC變換器電路。首先,對非隔離型和隔離型DC/DC變換器基本拓?fù)溥M(jìn)行了對比分析,確定了單端正激式拓?fù)錇橹麟娐方Y(jié)構(gòu),然后對主電路進(jìn)行了設(shè)計(jì)。其次,對變換器的控制電路和反饋電路進(jìn)行了設(shè)計(jì)。最后,設(shè)計(jì)了限流保護(hù)、過壓保護(hù)等保護(hù)電路,進(jìn)一步提高變換器的性能。3.采用了蒙特卡羅方法分析該DC/DC變換器。首先,給出了蒙特卡羅法分析流程,并在Saber仿真軟件中建立了變換器的仿真電路。其次,對變換器電路進(jìn)行了蒙特卡羅法分析。最后,給出了蒙特卡羅法分析結(jié)果。利用蒙特卡羅法優(yōu)化器件參數(shù),提高變換器的可靠性。4.結(jié)合電路設(shè)計(jì)和蒙特卡羅法器件優(yōu)化完成了DC/DC變換器模塊制作。制作了一臺200V-400V輸入,28V/300W輸出,體積半磚左右,效率不小于88%,高功率密度的電源模塊。給出了實(shí)驗(yàn)波形和效率曲線圖,實(shí)驗(yàn)結(jié)果證明了基于蒙特卡羅法的二次電源DC/DC變換器的優(yōu)化方案可行,各項(xiàng)性能達(dá)到了設(shè)計(jì)要求。
[Abstract]:At present, the domestic aviation power supply system mainly uses the low voltage 28V DC power supply, in recent years the foreign aviation plane gradually uses 270V high voltage DC power (HVDC) power supply to replace the low voltage DC power supply. Aviation high voltage power supply system has the advantages of high power transmission efficiency, light weight and so on, so it has gradually become the mainstream development trend of aviation power supply system. The secondary power supply is directly oriented to the airborne power equipment, and its performance affects the quality of the whole aviation power supply system. However, there are few researches on the secondary conversion technology of the 270V HVDC power supply in China. In this paper, the secondary power DC/DC converter in the aeronautical HVDC power supply system is taken as the research object. According to the requirements of high power density and high reliability of the secondary power supply, a secondary power DC/DC converter is designed. The main content is: 1. The development process of aeronautical power supply system is discussed. The advantages of HVDC power supply system and the development trend of DC/DC converter in secondary power supply are analyzed. The Monte Carlo method and its application in power electronic applications. The DC/DC converter circuit of secondary power supply is designed. Firstly, the basic topologies of non-isolated and isolated DC/DC converters are compared and analyzed, and the main circuit structure of single-terminal forward topology is determined, and then the main circuit is designed. Secondly, the control circuit and feedback circuit of the converter are designed. Finally, the current limiting protection, overvoltage protection and other protection circuits are designed to further improve the performance of the converter. Monte Carlo method is used to analyze the DC/DC converter. First, the Monte Carlo analysis flow is given, and the simulation circuit of the converter is established in the Saber simulation software. Secondly, the converter circuit is analyzed by Monte Carlo method. Finally, the results of Monte Carlo analysis are given. Monte Carlo method is used to optimize the device parameters to improve the reliability of the converter. Combined with circuit design and Monte Carlo device optimization, the DC/DC converter module is fabricated. A 200V-400V input 28V / 300W output module with a volume of about half brick and an efficiency of no less than 88 is made, which has a high power density. The experimental waveforms and efficiency curves are given. The experimental results show that the optimization scheme of the secondary power DC/DC converter based on Monte Carlo method is feasible, and the performance of the converter meets the design requirements.
【學(xué)位授予單位】：西京學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：V242

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本文編號：2196016