外文翻譯---單級(jí)單刀功率因數(shù)校正器acdc變換器-其他專(zhuān)業(yè)(已修改)
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【正文】 電子與信息工程學(xué)院 本科畢業(yè)論文 (設(shè)計(jì) ) 外 文 文 獻(xiàn) 翻 譯 譯文題目： singlestage singleswitch powerfacter correction AC/DC converter 學(xué)生姓名： 專(zhuān) 業(yè)： 指導(dǎo)教師： 2021 年 3 月 原文 : 咸寧學(xué)院本科畢業(yè)論文：外文翻譯 1 Singlestage singleswitch power factor correctionAC/DC converter Abstract A singlestage singleswitch power factor correction AC/DC converter is proposed in which the power factor correction (PFC) inductor is connedted to a tap on the primary winding ofthe DC/DC flyback converter stage。 there is direct energy transfer of a part of the input energy tothe output and theDCbus voltage feedback. The additional discharge path in the PFC inductorand DCbus voltage feedback effectively suppresses the DCbus voltage and increases the overallefficiency. Experimental results for a 60W converter at a constant switching frequency of 70 kHzare obtained to show the performance of the proposed converter. It is shown that the voltageacross the DCbus capacitor can be held below 405V even though the converter operates in a widerange of input voltages (90V265VAC) and the measured input current harmonics satisfy the IEC。 1 Introduction Many PFC AC/DC converters have been presented inrecent years. PFC techniques can be divided into twocategories: a singlestage approach and a twostageapproach. The twostage approach is the most monlyused approach. Conventional twostage PFC convertersinvolve the use of cascading two powerprocessing stages,responsible for power factor correction and output voltageregualtion. A PFC converter is adopted at the frontend toforce the line current tracking the line voltage and anotherconventional DC/DC converter is cascaded after the PFCstage to obtain the desired tightly regulated output approach can obtain very good performance, such ashigh power factor, and low voltage stress. However, due tothe use of two powerprocessing stages, conversionefficiency is reduced and an additional PFC stage addsponents and plexity. Consequently the overall costincreases. The twostage approach has disadvantages oflowpower density, control plexity, and high reduce the overall size and cost, a number of siglestagePFC converters have been developed in the literature witches so that the PFC switch anditscontroller can be eliminated. Thesinglestage approach is specially attractive in lowcost and lowpower applicationsdue to its simple power stage and control circuit. However,it still has several drawbacks such as high current stress inpower switch and high DCbus voltage stress. Its majordrawback is a high voltage stress on the DCbus singlestage PFC AC/DC converters suffer from highDCbus voltage stress at light load and high line, whichmakes these converters impractical. A high DCbusvoltage means high ponent rating, high cost and lowvoltage stress. Experimental results for a 60W converter ata constant switching frequency of 70 kHz are obtained toshow the performance of the proposed converter. It is hown that the voltage across the DCbus capacitor can
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