發(fā)布時(shí)間：2018-07-16 09:12

【摘要】：航空高壓直流電源系統(tǒng)具有電網(wǎng)重量輕、易實(shí)現(xiàn)不中斷供電等特點(diǎn),是飛機(jī)電源系統(tǒng)未來的發(fā)展方向之一。本文以航空高壓直流電源系統(tǒng)中的二次電源DC/DC變換器為研究對(duì)象,討論了適用于二次電源直流母線變換器的功率拓?fù)?其中全橋LLC諧振變換器可在寬負(fù)載范圍內(nèi)實(shí)現(xiàn)原邊開關(guān)管的零電壓開通和副邊整流管的零電流關(guān)斷,有助于提高變換器效率和功率密度,是二次電源直流母線變換器的理想拓?fù)�。本文首先介紹了傳統(tǒng)變頻控制全橋LLC諧振變換器的工作原理,分析了寄生參數(shù)造成的輕載增益特性失效現(xiàn)象,及其給變換器帶來的不利影響,提出以變頻和移相相結(jié)合的混合控制方式作為解決對(duì)策�；跁r(shí)域分析法對(duì)混合控制全橋LLC諧振變換器的工作原理和基本特性進(jìn)行了分析,推導(dǎo)了變換器增益特性與占空比和頻率之間的關(guān)系。本文以頻率作為電壓增益特性的基本控制量,在此基礎(chǔ)上進(jìn)一步分析了另一變量占空比的最優(yōu)值,通過構(gòu)建變換器輕載損耗與占空比、頻率、負(fù)載三者之間的數(shù)學(xué)模型,分析輕載運(yùn)行時(shí)各負(fù)載點(diǎn)的最優(yōu)占空比,以此作為控制依據(jù),使變換器運(yùn)行損耗最小化。針對(duì)低壓大電流輸出應(yīng)用,為了進(jìn)一步提高變換器的效率,本文討論了適用于混合控制方式的同步整流方案,實(shí)驗(yàn)對(duì)比了勵(lì)磁電感外置方案和同步整流管導(dǎo)通壓降檢測(cè)方案的同步整流效果,最終采用導(dǎo)通壓降檢測(cè)方案來實(shí)現(xiàn)同步整流,并采用電感補(bǔ)償?shù)姆椒▋?yōu)化了導(dǎo)通壓降檢測(cè)方案的驅(qū)動(dòng)信號(hào)。最后完成一臺(tái)270V/28V 1000W的原理樣機(jī)的設(shè)計(jì)與實(shí)驗(yàn)驗(yàn)證,實(shí)驗(yàn)結(jié)果驗(yàn)證了理論分析和工程設(shè)計(jì)的正確性。
[Abstract]:The high voltage DC power system has the characteristics of light weight and uninterruptible power supply. It is one of the future development directions of the aircraft power supply system. In this paper, the two power DC/DC converter in the high voltage DC power supply system is used as the research object, and the power topology of the two DC bus converter is discussed. The bridge LLC resonant converter can realize zero voltage opening of the original side switch and the zero current turn off in the secondary rectifier in a wide load range. It is helpful to improve the efficiency and power density of the converter. It is the ideal topology of the two power DC bus converter. This paper first introduces the working principle of the traditional variable frequency control full bridge LLC resonant converter. This paper analyzes the failure phenomenon of light load gain characteristics caused by parasitic parameters and its adverse effects on the converter. A hybrid control mode combining frequency conversion and phase shift is proposed as a solution. Based on the time domain analysis method, the working principle and basic characteristics of the hybrid control full bridge LLC resonant converter are analyzed, and the converter is derived. The relationship between the gain characteristics and the duty ratio and frequency. Based on the frequency as the basic control of the voltage gain characteristics, this paper further analyzes the optimal value of the duty ratio of another variable. By constructing the mathematical model between the light load loss and the duty ratio, the frequency and the load three, the load points are analyzed in the light load operation. The optimal duty cycle is used as the control basis to minimize the loss of the converter. In order to further improve the efficiency of the converter, in order to further improve the efficiency of the converter, this paper discusses the synchronous rectification scheme which is suitable for the hybrid control mode. The experiment compares the excitation inductor external scheme and the synchronous rectifying tube conduction pressure drop detection scheme. In the end, the synchronous rectification is adopted to realize the synchronous rectification, and the driving signal of the pressure drop detection scheme is optimized by the inductance compensation method. Finally, the design and experimental verification of a 270V/28V 1000W prototype are completed, and the experimental results verify the correctness of the theoretical analysis and the engineering design.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：V242.2;TM46

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 岳衡;陳敏;;變壓器寄生電容對(duì)LLC空載穩(wěn)定運(yùn)行影響的研究[J];電源學(xué)報(bào);2013年03期

2 鄧翔;李大偉;楊善水;;LLC變換器中諧振元件的設(shè)計(jì)[J];電力電子技術(shù);2013年02期

3 孟瑞;曠建軍;;最小二乘法在磁芯損耗參數(shù)擬合中的應(yīng)用[J];現(xiàn)代科學(xué)儀器;2013年01期

4 Jintae Kim;;LLC諧振轉(zhuǎn)換器在輕載條件下增益失真的考慮事項(xiàng)[J];今日電子;2011年04期

5 趙志英;龔春英;秦海鴻;;高頻變壓器分布電容的影響因素分析[J];中國電機(jī)工程學(xué)報(bào);2008年09期

6 朱新宇;彭衛(wèi)東;;多電飛機(jī)及其技術(shù)應(yīng)用[J];中國民航飛行學(xué)院學(xué)報(bào);2007年06期

7 秦海鴻;楊正龍;任f袒，

本文編號(hào)：2125922