【文章內(nèi)容簡介】 處，而且PID參數(shù)的選取過程中花費了大量的時間，還有其它更好的選取方法值得我去借鑒，這將在以后的學(xué)習(xí)過程中去實施。第六章 總結(jié)與展望近年來，DC/DC開關(guān)變換器以其轉(zhuǎn)換效率高、穩(wěn)壓范圍寬、功率密度比大、重量輕等優(yōu)點，廣泛應(yīng)用于電子產(chǎn)品中。開關(guān)變換器的總體發(fā)展趨勢為：高效率、低壓大電流、智能化設(shè)計、標(biāo)準(zhǔn)化工作等。本文研究了BUCK型DC/DC變換器的主電路結(jié)構(gòu)及工作原理，分析了PID雙閉環(huán)控制，并對其雙閉環(huán)控制進(jìn)行了仿真驗證。通過本次課題的研究與實踐，使我得到了進(jìn)一步的鍛煉，加深了電力電子方面的知識。由于本人水平及經(jīng)驗的限制，本次設(shè)計還有很多不到位的地方，值得我在今后的學(xué)習(xí)研究中去完善，主要有以下幾個方面：研究DC/DC變換器的其它拓?fù)浣Y(jié)構(gòu)，并將各種拓?fù)浣Y(jié)構(gòu)的性能特點做比較。研究Buck變換器其它的現(xiàn)代控制方法，了解它們的結(jié)構(gòu)和原理。進(jìn)一步提高M(jìn)atlab軟件的應(yīng)用水平，為仿真與設(shè)計更多電路打下良好的基礎(chǔ)。參考文獻(xiàn)[1] 劉樹林. 輸出本質(zhì)安全型BuckBoost DCDC變換器的分析與設(shè)計，中國電機工程學(xué)報， 2008，28(3): 6065.[2] 馬麗梅. Buckboost DCDC變換器的控制，河北工業(yè)大學(xué)學(xué)報，2008，37(4) :101105.[3] 劉樹林. BuckBoost變換器的能量傳輸模式及輸出紋波電壓分析，電子學(xué)報，2007， 20(5) :838843.[4] 彭力. 新型大功率升降壓型DCDC變換器控制研究,船電技術(shù)，1999，3(1) :2628.[5] 鐘久明. 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INTRODUCTIONInsuring stability of a proposed power supply solution is often one of the more challenging aspects of the design process. Nothing is more disconcerting than to have your lovingly crafted breadboard break into wild oscillations just as its being demonstrated to the boss or customer, but insuring against this unfortunate event takes some analysis which many designers view as formidable. Paths taken by design engineers often emphasize either cutandtry empirical testing in the laboratory or puter simulations looking for numerical solutions based on plex mathematical models. While both of these approach a basic understanding of feedback theory will usually allow the definition of an acceptable pensation network with a minimum of putational effort.II. STABILITY DEFINED Fig. 1 gives a quick illustration of at least one definition of stability. In its simplest terms, a system is stable if, when subjected to a perturbation from some source, its response to that perturbation eventually dies out. Note that in any practical 1 system, instability cannot result in a pletely unbounded response as the system will either reach a saturation level – or fail. Oscillation in a switching regulator can, at most, vary the duty cycle between zero and 100% and while that may not prevent failure, it wills ultimate limit the response of an unstable system.Fig. 1. Definition of stability Another way of visualizing stability is shown in Fig. 2. While this graphically illustrates the concept of system stability, it also points out that we must make a further distinction between largesignal and smallsignal stability. While smallsignal stability is an important and necessary criterion, a system could satisfy thisrt quirement and yet still bee unstable with a largesignal perturbation. It is important that designers remember that all the gain and phase calculations we might perform are only to insure smallsignal stability. These calculations are based upon – and only applicable to – linear systems, and a switching regulator is – by definition – a nonlinear system. We solve this conundrum by performing our analysis using smallsignal perturbations around a largesignal operating point