本文選題：功率因數(shù)校正　切入點(diǎn)：降壓型變換器　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：功率因數(shù)(Power Factor)定義了有功功率在視在功率中所占的比例。電流中諧波含量越大,功率因數(shù)越低。在電路中采用有源功率因數(shù)校正技術(shù)能夠使輸入電流波形接近正弦波并且與輸入電壓同相位,進(jìn)而達(dá)到功率因數(shù)校正的目的。功率因數(shù)校正電路只有三種基本結(jié)構(gòu),所有的結(jié)構(gòu)都是基于這三種基本結(jié)構(gòu)所進(jìn)行相應(yīng)的變化。這三種結(jié)構(gòu)分別是:降壓型(Buck)、升壓型(Boost)、降壓升壓型(Buck-Boost)。相對(duì)于其他兩種類型的變換器,Buck型變換器具有其不可替代的優(yōu)點(diǎn),但是由于其輸入電流存在固有的交越失真(Cross-over Distortion),也稱為輸入電流死區(qū),其功率因數(shù)總是不能達(dá)到滿足各種工業(yè)標(biāo)準(zhǔn)要求的水平,因而限制了這種結(jié)構(gòu)在實(shí)際中的應(yīng)用。如果能夠采用某種方法使Buck型功率因數(shù)變換器的輸入電流死區(qū)得到一定程度上的抑制或者補(bǔ)充,那么在這種特定控制方式下的改進(jìn)型功率因數(shù)變換器的應(yīng)用范圍將大大拓展。本文基于傳統(tǒng)Buck型變換器基本拓?fù)浣Y(jié)構(gòu),提出了兩種改進(jìn)的降壓型功率因數(shù)變換器的結(jié)構(gòu)。這兩種結(jié)構(gòu)能夠在輸入電流交越失真階段補(bǔ)充電流,使輸入電流準(zhǔn)正弦,從而能夠在保持傳統(tǒng)Buck型變換器優(yōu)點(diǎn)的基礎(chǔ)上克服其固有的缺陷。在此基礎(chǔ)上,本文針對(duì)這兩種改進(jìn)的變換器結(jié)構(gòu)提出了兩種控制方案。本文所闡述的結(jié)構(gòu)相對(duì)于傳統(tǒng)Buck型電路在輸出端增加一個(gè)MOS開關(guān),通過控制兩個(gè)MOS開關(guān)的不同開關(guān)狀態(tài),使電路在交越失真階段轉(zhuǎn)換為Buck-Boost型拓?fù)浣Y(jié)構(gòu),從而使電流失真得到克服。對(duì)于控制電路,通過使用額外的電壓比較器判定發(fā)生交越失真的時(shí)間節(jié)點(diǎn),從而實(shí)現(xiàn)對(duì)電路結(jié)構(gòu)變換的控制。論文中采用臨界導(dǎo)通控制方式,單級(jí)變換器結(jié)構(gòu)設(shè)計(jì)的PAB(pulse assisting buck)變換器與MTB(multiple topology buck)變換器克服了傳統(tǒng)Buck型變換器的輸入電流死區(qū),大大提升了Buck型變換器的性能。本文設(shè)計(jì)的兩種結(jié)構(gòu)適用于中等功率水平的單級(jí)PFC變換器,并采用SIMPLIS進(jìn)行驗(yàn)證。其中,PAB變換器在輸入220V,50Hz的條件下,其功率因數(shù)為98.74%,電源效率為97.21%。MTB變換器在輸入電壓90V~264V范圍內(nèi)的功率因數(shù)范圍為96.74%~99.70%。結(jié)果表明這兩種改進(jìn)型的功率因數(shù)變換器確實(shí)能夠大幅提高傳統(tǒng)Buck型變換器的功率因數(shù),并改善了諧波條件,使變換器能夠滿足各種國際標(biāo)準(zhǔn)的指標(biāo)要求。
[Abstract]:Power Factor Power Factor defines the proportion of active power in apparent power. The lower the power factor is, the more active power factor correction technology is used in the circuit to make the input current waveform close to sine wave and the same phase as the input voltage. Thus achieving the purpose of power factor correction. There are only three basic structures of the power factor correction circuit. All the structures are based on the corresponding changes of these three basic structures, which are: buck, booster boost, and boost Buck-Boost.Compared with the other two types of converter, the Buck converter has its irreplaceable advantages. However, due to the inherent cross-over distortion of the input current, also known as the dead zone of the input current, its power factor can not always meet the requirements of various industrial standards. Therefore, the application of this kind of structure in practice is limited. If some method can be used to suppress or supplement the dead time of input current of Buck type power factor converter to a certain extent, Then the application range of the improved power factor converter under this particular control mode will be greatly expanded. This paper is based on the basic topology of the traditional Buck converter. Two improved step-down power factor converter structures are proposed, which can replenish the input current during the phase of cross-distortion and make the input current quasi-sinusoidal. Therefore, it can overcome the inherent defects on the basis of maintaining the advantages of traditional Buck converters. In this paper, two control schemes are proposed for these two improved converters. Compared with the traditional Buck circuit, the structure described in this paper adds a MOS switch at the output end, and controls the different switching states of the two MOS switches. The current distortion can be overcome by converting the circuit to Buck-Boost topology in the phase of cross-over distortion. For the control circuit, the time node in which the cross-over distortion occurs is determined by the use of additional voltage comparator. In this paper, the PAB(pulse assisting converter and MTB(multiple topology converter designed by single stage converter structure overcome the dead time of input current of the traditional Buck converter. The performance of Buck converter is greatly improved. The two structures designed in this paper are suitable for single-stage PFC converter with medium power level and verified by SIMPLIS. The power factor of the converter is 98.744.The power efficiency of the converter is 97.21.MTB converter has a power factor range of 96.7474 / 99.70V within the input voltage of 90V / 264V. the results show that the two improved power factor converters can greatly improve the power factor of the traditional Buck converter. The harmonic condition is improved so that the converter can meet the requirements of various international standards.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 丁志剛;胡鈺林;周華良;夏雨;朱英英;;一種新型變換器式取能電路[J];電力系統(tǒng)自動(dòng)化;2013年12期

2 黃金鋒;;利用改進(jìn)的Lackenby進(jìn)行船型變換與優(yōu)化[J];船海工程;2012年04期

3 曹太強(qiáng);王軍;孫章;羅謙;;有源鉗位正激二次側(cè)諧振PWM Buck-Boost型變換器[J];電工技術(shù)學(xué)報(bào);2014年04期

4 杜少武;史金仙;陳中;;一種用于混合動(dòng)力汽車的新型變換器[J];電力電子技術(shù);2010年05期

5 田國濤;王志強(qiáng);董鋒;;新型可實(shí)現(xiàn)寬范圍電壓輸出的變換器的分析與仿真[J];電源世界;2004年08期

6 張靈改;陳道煉;;Buck-Boost型變換器電路結(jié)構(gòu)及其演化[J];電力電子技術(shù);2009年04期

7 林真;陳道煉;;Buck型變換器電路結(jié)構(gòu)及其演化過程[J];通信電源技術(shù);2010年02期

8 闞加榮;;隔離型變換器工作原理的講解[J];高校實(shí)驗(yàn)室工作研究;2011年03期

9 ;BY—2與BY—1型變換器的分析比較[J];鐵道車輛;1980年10期

10 徐志望;陳道煉;;Boost型變換器電路結(jié)構(gòu)及其演化[J];通信電源技術(shù);2010年03期

相關(guān)會(huì)議論文 前1條

1 高金峰;熊軍華;;不同混沌源調(diào)制信號(hào)降低Boost型變換器電磁干擾水平研究[A];第十六屆電工理論學(xué)術(shù)年會(huì)論文集[C];2004年

相關(guān)重要報(bào)紙文章 前2條

1 科學(xué)技術(shù)部發(fā)展計(jì)劃司 提供;新型變換氣制堿節(jié)能技術(shù)[N];中國鄉(xiāng)鎮(zhèn)企業(yè)報(bào);2003年

2 本報(bào)記者 王延輝;新型變換氣制堿降耗優(yōu)勢凸顯[N];中國化工報(bào);2011年

相關(guān)博士學(xué)位論文 前1條

1 王廣柱;電壓型變換器拋物線法電流控制技術(shù)研究[D];山東大學(xué);2008年

相關(guān)碩士學(xué)位論文 前8條

1 黃印e，

本文編號(hào)：1622137