本文選題：數(shù)字DC-DC開(kāi)關(guān)變換器　切入點(diǎn)：連續(xù)時(shí)間模型　出處：《合肥工業(yè)大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：DC-DC開(kāi)關(guān)變換器能夠進(jìn)行直流電能變換,以滿足各種負(fù)載的供電要求,被廣泛應(yīng)用于信息、通信、能源等關(guān)鍵領(lǐng)域。隨著工業(yè)和科技的發(fā)展,各種負(fù)載對(duì)DC-DC開(kāi)關(guān)電源的功能和性能提出了越來(lái)越高的要求。與傳統(tǒng)的模擬控制方法相比,數(shù)字控制不僅具有高靈活性、可編程性等特點(diǎn),而且可以采用更先進(jìn)的控制算法來(lái)提高開(kāi)關(guān)變換器的性能。因此,由模擬控制轉(zhuǎn)向數(shù)字控制將成為未來(lái)開(kāi)關(guān)變換器的發(fā)展趨勢(shì)。本文以Buck開(kāi)關(guān)變換器為例,分別對(duì)模擬和數(shù)字DC-DC開(kāi)關(guān)變換器進(jìn)行建模仿真與驗(yàn)證,并對(duì)數(shù)字自適應(yīng)補(bǔ)償控制方法進(jìn)行研究和分析。具體工作包括:系統(tǒng)分析DC-DC開(kāi)關(guān)變換器在不同工作模式下的工作過(guò)程,建立其連續(xù)時(shí)間模型,并考慮電路寄生參數(shù),對(duì)非理想Buck變換器進(jìn)行建模分析。建立數(shù)字DC-DC離散z域模型,分析離散化過(guò)程中采樣、保持和量化等問(wèn)題。采用自適應(yīng)補(bǔ)償控制方法,當(dāng)負(fù)載發(fā)生變化時(shí),通過(guò)自適應(yīng)調(diào)整系統(tǒng)的補(bǔ)償系數(shù),提高系統(tǒng)穩(wěn)定性,降低系統(tǒng)誤差和延時(shí),改善系統(tǒng)瞬態(tài)性能。通過(guò)Matlab/Simulink平臺(tái),采用自適應(yīng)補(bǔ)償控制算法對(duì)數(shù)字DC-DC開(kāi)關(guān)變換器模型進(jìn)行系統(tǒng)仿真、優(yōu)化,并對(duì)其進(jìn)行穩(wěn)態(tài)、負(fù)載擾動(dòng)等分析。仿真結(jié)果表明,開(kāi)關(guān)頻率為100kHz到1MHz時(shí),系統(tǒng)輸出電壓變化穩(wěn)定在5V,瞬態(tài)響應(yīng)時(shí)間為0.22ms,驗(yàn)證了所研究控制方法的正確性。
[Abstract]:DC-DC switching converters are capable of DC energy conversion to meet the power supply requirements of various loads, and are widely used in key fields such as information, communications, energy, etc. With the development of industry and technology, The functions and performance of DC-DC switching power supply are demanded more and more by various loads. Compared with the traditional analog control method, digital control not only has the characteristics of high flexibility and programmability. Moreover, more advanced control algorithms can be used to improve the performance of switching converters. Therefore, the conversion from analog control to digital control will become a trend in the future. This paper takes Buck switching converters as an example. Modeling, simulation and verification of analog and digital DC-DC switching converters are carried out, and digital adaptive compensation control methods are studied and analyzed. The specific work includes: systematically analyzing the working process of DC-DC switching converters in different operating modes. The continuous time model is established and the parasitic parameters of the circuit are considered to model and analyze the non-ideal Buck converter. The discrete z domain model of digital DC-DC is established to analyze the sampling in the process of discretization. When the load changes, the compensation coefficient of the system can be adjusted adaptively to improve the stability of the system and reduce the system error and delay. The transient performance of the system is improved. The digital DC-DC switching converter model is simulated and optimized by adaptive compensation control algorithm based on Matlab/Simulink platform. The steady state and load disturbance are analyzed. The simulation results show that, When the switching frequency is 100kHz to 1MHz, the output voltage of the system is stable at 5V and the transient response time is 0.22ms. the correctness of the proposed control method is verified.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM46

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