本文選題：有源鉗位　切入點(diǎn)：正激變換器　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著超大規(guī)模集成電路的快速發(fā)展,計(jì)算機(jī)、通信系統(tǒng)的供電電源也有了新的發(fā)展趨勢(shì):輸出電壓越來越低,輸出電流越來越大,同時(shí)功率密度也不斷提升。因此,低電壓、大電流輸出、高功率密度的DC/DC電源的研究在最近幾年受到廣泛的關(guān)注。正激變換器由于其電路結(jié)構(gòu)簡單,輸出紋波電壓小等特點(diǎn),在中小功率應(yīng)用場(chǎng)合扮演著非常重要的角色。本文通過采用有源鉗位復(fù)位技術(shù),克服了傳統(tǒng)單端正激變換器中磁芯工作在第一象限,磁芯利用率不高的缺點(diǎn)。利用有源鉗位復(fù)位技術(shù)還降低了開關(guān)管的電壓應(yīng)力,并且能將勵(lì)磁電感和漏感中的能量循環(huán)利用,提高了變換器的效率。同時(shí),在低壓大電流輸出的應(yīng)用中,由肖特基二極管正向壓降產(chǎn)生的損耗占總損耗比例越來越大,限制了效率的提高,本文通過采用同步整流技術(shù)有效的解決了這個(gè)問題。文中首先分析了傳統(tǒng)單端正激變換器的工作原理,根據(jù)正激變換器的特點(diǎn)對(duì)常用的幾種復(fù)位方式進(jìn)行了分析。然后深入分析了有源鉗位復(fù)位的正激變換器的工作過程。其中包括主開關(guān)管實(shí)現(xiàn)零電壓開通的條件,漏感延遲的影響,鉗位電路對(duì)勵(lì)磁電感和漏感中能量循環(huán)利用。再結(jié)合實(shí)際應(yīng)用中的兩種鉗位方式進(jìn)行了詳細(xì)的對(duì)比。其次,為了提高效率,文中對(duì)同步整流技術(shù)做了相關(guān)研究。分析了常用的電壓型和電流型同步整流驅(qū)動(dòng)方式,考慮到有源鉗位復(fù)位技術(shù)的特點(diǎn)和本課題的輸入輸出電壓范圍,文中采用變壓器繞組自驅(qū)動(dòng)同步整流方式。另外,為了減小電源體積,滿足工業(yè)標(biāo)準(zhǔn)半磚結(jié)構(gòu),采用了平面變壓器取代傳統(tǒng)的變壓器,有效的提高了電源功率密度。最后,詳細(xì)介紹了電路的設(shè)計(jì)過程,制作實(shí)驗(yàn)樣機(jī)并完成測(cè)試。最大效率達(dá)到88%,功率密度達(dá)36.5W/in3,紋波電壓小于50 mV,滿足設(shè)計(jì)要求。
[Abstract]:With the rapid development of VLSI, the power supply of computer and communication system has a new trend: the output voltage is getting lower and lower, the output current is increasing, and the power density is increasing. The research of DC/DC power supply with high current output and high power density has attracted extensive attention in recent years. Due to its simple circuit structure and low output ripple voltage, the forward converter has many advantages such as low output ripple voltage and so on. It plays a very important role in medium and small power applications. By adopting active clamp reset technique, this paper overcomes the fact that the core of the traditional single-terminal forward converter works in the first quadrant. The use of active clamp reset technology also reduces the voltage stress of the switch tube, and can recycle the energy in the excitation inductance and leakage inductance, thus improving the efficiency of the converter. In the application of low-voltage and high-current output, the loss caused by forward voltage drop of Schottky diode is increasing in the total loss, which limits the improvement of efficiency. In this paper, this problem is effectively solved by using synchronous rectifier technology. Firstly, the working principle of traditional single-terminal forward converter is analyzed. According to the characteristics of forward converter, several common reset methods are analyzed. Then, the working process of active clamp reset forward converter is analyzed in depth. Because of the effect of leakage inductance delay, the clamping circuit makes a detailed comparison between the excitation inductance and the energy recycle in leakage inductance. Then, the two clamping modes in practical application are compared in detail. Secondly, in order to improve the efficiency, In this paper, the synchronous rectifier technology is studied. The common voltage mode and current mode drive mode are analyzed. Considering the characteristics of active clamp reset technology and the input and output voltage range of this subject, In addition, in order to reduce the power supply volume and meet the industrial standard semi-brick structure, a plane transformer is used to replace the traditional transformer, which effectively improves the power density of the power supply. The design process of the circuit is introduced in detail, the experimental prototype is made and the test is completed. The maximum efficiency is 88, the power density is 36.5 W / in 3, and the ripple voltage is less than 50 MV, which meets the design requirements.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46

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