發(fā)布時間：2018-08-01 11:37

【摘要】：隔離型升壓電源作為一種可以實現(xiàn)直流升壓功能的變換器,將在新能源以及航空航天等相關(guān)領(lǐng)域發(fā)揮重要作用。目前,針對隔離型升壓電源的研究主要集中在如何提高升壓比、如何提高效率以及如何提高變換器的功率密度三個方面。本文對隔離型升壓變換器的研究現(xiàn)狀進(jìn)行了分析,并對常用的升壓方式進(jìn)行了介紹。通過對典型的隔離型升壓變換器進(jìn)行對比,說明了有源箝位正反激在拓?fù)浣Y(jié)構(gòu)、開關(guān)管應(yīng)力、效率等方面的優(yōu)勢。正反激變換器工作時存在三種模式:連續(xù)模式、臨界連續(xù)模式以及斷續(xù)模式,文章詳細(xì)分析了三種模式的工作原理,并對臨界連續(xù)模式的實現(xiàn)方式進(jìn)行了介紹。有源箝位電路通常存在兩種驅(qū)動方式:互補驅(qū)動、非互補驅(qū)動。通過對有源箝位電路的驅(qū)動方式進(jìn)行分析研究,本文最終采用導(dǎo)通時間短,箝位電路環(huán)流小,有利于軟開關(guān)實現(xiàn)的非互補驅(qū)動方式。正反激變換器的傳統(tǒng)控制方式主要有三種:關(guān)斷時間控制、定頻控制以及準(zhǔn)諧振控制。本文對上述三種控制方式進(jìn)行分析,通過結(jié)合此三種控制方式的優(yōu)點,提出了一種新型混合控制方式,提高了變換器在整個負(fù)載范圍內(nèi)的效率。新型混合控制設(shè)計變換器重載工作于臨界連續(xù)模式,實現(xiàn)主功率開關(guān)管的軟開關(guān);輕載工作于關(guān)斷時間控制的斷續(xù)模式,降低輕載頻率;極輕載時工作于定頻控制的斷續(xù)模式,保持較低頻率的驅(qū)動輸出。變壓器的交流阻抗與變壓器的繞法以及繞線選型有直接的關(guān)系,本文通過對變壓器集膚效應(yīng)以及鄰近效應(yīng)的分析,確定采用三明治繞法,將原邊繞組拆分為多層并聯(lián),實現(xiàn)與副邊繞組的夾繞。根據(jù)給定的設(shè)計指標(biāo),本文給出了正反激變換器的參數(shù)設(shè)計結(jié)果,并搭建了300W樣機平臺。通過實驗,驗證了新型混合控制的可行性以及設(shè)計思想的正確性,采用新型混合控制,變換器能夠在全輸入、全負(fù)載范圍內(nèi)實現(xiàn)功率開關(guān)管的軟開關(guān),變換器整機CEC峰值效率為97.66%,CEC標(biāo)稱平均效率為97.29%,CEC加權(quán)效率為97.19%。
[Abstract]:As a kind of converter which can realize DC boost, isolated booster power supply will play an important role in new energy sources, aerospace and other related fields. At present, the research of isolated booster power supply mainly focuses on how to improve the boost ratio, how to improve the efficiency and how to improve the power density of the converter. In this paper, the research status of isolated boost converter is analyzed, and the usual booster mode is introduced. Through the comparison of typical isolated boost converters, the advantages of active clamp forward and flyback excitation in topology, switch stress, efficiency and so on are illustrated. There are three modes in forward and flyback converter: continuous mode, critical continuous mode and intermittent mode. The working principle of the three modes is analyzed in detail, and the realization mode of critical continuous mode is introduced. There are usually two driving modes in active clamp circuits: complementary drive and non-complementary drive. Through the analysis of the driving mode of active clamp circuit, this paper finally adopts the non-complementary driving mode which is beneficial to the realization of soft switch because of the short on-on time and the small circulation of clamping circuit. There are three traditional control methods of forward and flyback converter: turn-off time control, fixed frequency control and quasi resonant control. In this paper, the three control methods mentioned above are analyzed, and a new hybrid control mode is proposed by combining the advantages of the three control modes, which improves the efficiency of the converter in the whole load range. The new hybrid control design converter works in critical continuous mode to realize soft switch of main power switch, light load works in intermittent mode of turn-off time control to reduce light load frequency, and very light load works in intermittent mode of constant frequency control. Maintain lower frequency drive output. The AC impedance of the transformer is directly related to the winding method of the transformer and the selection of the winding wire. Through the analysis of the skin effect and proximity effect of the transformer, the sandwich winding method is adopted to split the original side winding into multi-layer parallel connection. Realize the clamp winding with the secondary side winding. According to the given design index, the design results of the forward and flyback converter parameters are given, and the 300W prototype platform is built. Through experiments, the feasibility of the new hybrid control and the correctness of the design idea are verified. With the new hybrid control, the converter can realize the soft switch of the power switch in the full input and full load range. The CEC peak efficiency of the converter is 97.66 and the nominal average efficiency is 97.29 and the weighted efficiency is 97.19.
【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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本文編號：2157456