發(fā)布時(shí)間：2018-02-11 04:54

  本文關(guān)鍵詞： 低壓大電流 有源鉗位 軟開關(guān) 交錯(cuò)并聯(lián)Buck 高頻變壓器　出處：《西安電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：電源作為電子設(shè)備的基本動(dòng)力源正經(jīng)歷著不斷的發(fā)展和改進(jìn),為滿足IC芯片電壓越來越低、電流越來越高、低損耗、高效率、高功率密度等發(fā)展要求,研究高性能的綠色開關(guān)電源已成為電源的發(fā)展趨勢。本文設(shè)計(jì)了一款48V輸入、1.2V/220A輸出的兩級式變換器,電路拓?fù)浣Y(jié)構(gòu)采用“有源鉗位正激+多相交錯(cuò)并聯(lián)Buck”。將軟開關(guān)技術(shù)與PWM控制技術(shù)相結(jié)合運(yùn)用于有源鉗位ZVS-PWM正激變換器的設(shè)計(jì),該變換器實(shí)現(xiàn)并滿足了主開關(guān)管ZVS開通的要求,變壓器的磁化能量實(shí)現(xiàn)了循環(huán)利用。主電路中變壓器的副邊采用自驅(qū)動(dòng)同步整流技術(shù),使得電路整流損耗與總損耗的比值低50%,有效降低了系統(tǒng)的總損耗。高頻變壓器磁芯材料的特性參數(shù),形狀及外形尺寸等相關(guān)參數(shù)的優(yōu)化設(shè)計(jì),降低了變壓器的損耗,提高了系統(tǒng)變換器的效率。采用四相交錯(cuò)并聯(lián)同步Buck電路解決了單個(gè)同步Buck變換器中整流管電壓、電流應(yīng)力大、效率低等問題,電路的輸出電流紋波得到了減小,可靠性和功率密度得到了提高,電路實(shí)現(xiàn)了N+n的冗余特性。利用軟件Saber和MATLAB對系統(tǒng)進(jìn)行了相關(guān)的建模和仿真,驗(yàn)證了系統(tǒng)結(jié)構(gòu)設(shè)計(jì)和電路詳細(xì)設(shè)計(jì)的可行性和正確性。仿真結(jié)果及其數(shù)據(jù)分析表明,變換器具有低損耗、高效率、功率密度高、紋波系數(shù)小等優(yōu)點(diǎn),電源效率可達(dá)到85%以上,輸出電壓和輸出電流紋波系數(shù)均小于0.2%,各項(xiàng)性能指標(biāo)均可滿足并達(dá)到所需電源設(shè)計(jì)的要求。
[Abstract]:As the basic power source of electronic equipment, power supply is undergoing continuous development and improvement. In order to meet the development requirements of IC chip, such as lower voltage, higher current, lower loss, higher efficiency and higher power density, etc. Research on high performance green switching power supply has become the trend of power supply. In this paper, a 48V input 1.2V / 220A output two-stage converter is designed. The circuit topology adopts "active clamp forward multiphase interleaving parallel Buck". The soft switching technology and PWM control technology are combined in the design of active clamp ZVS-PWM forward converter. The converter realizes and meets the requirements of ZVS switch on. The magnetization energy of the transformer can be recycled. In the main circuit, the secondary edge of the transformer adopts the self-drive synchronous rectifier technology. The ratio of rectifier loss to total loss of circuit is reduced by 50%, and the total loss of the system is effectively reduced. The optimization design of characteristic parameter, shape and shape size of magnetic core material of high frequency transformer reduces the loss of transformer. The efficiency of the system converter is improved by adopting four-phase interleaving parallel synchronous Buck circuit to solve the problems of rectifier voltage, high current stress and low efficiency in a single synchronous Buck converter, and the output current ripple of the circuit is reduced. The reliability and power density are improved, and the redundancy of N _ n is realized by the circuit. The software Saber and MATLAB are used to model and simulate the system. The simulation results and data analysis show that the converter has the advantages of low loss, high efficiency, high power density and low ripple coefficient, and the power efficiency can reach more than 85%. The ripple coefficients of output voltage and output current are less than 0.2. Each performance index can meet the requirement of power supply design.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46

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本文編號(hào)：1502246