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INTRODUCTIONTomeettherequirementsofEMIstandard ,switchingmodeconvertersshouldlimititsswitchingrippleofinputcurrenttoalowlevel.OneofthetypicaltraditionalmethodsistoplaceacostlyandbulkyEMIfilterattheinputcircuitoftheconverter.ForAC DCconverterstheinputfi… 相似文献
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INTRODUCTIONTocopewiththemoreandmoreserioushar monicproblemsmainlycausedbypowerelec tronicequipmentapplication ,variouskindsofactivefiltershavebeenproposedandputintofieldapplicationsrecently.Amongthem ,aSeri alHybridActivePowerFilter (SHAPF)asshowninFig.1 (… 相似文献
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NTRODUCTIONTocopewiththemoreandmoreserioushar monicproblemsmainlycausedbypowerelec tronicequipment,variouskindsofactivefilterswereproposedandputintofieldapplications(Akagi,1 996;Chengetal.,1 996;Bhatta charya,etal.,1 995) .Amongthem ,aserialhybridactivepowerfilter (S… 相似文献
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吕征宇 《小学阅读指南(3-6年级)》2004,(6)
春天,爬山虎刚发出嫩芽,有一点点淡绿色。可是,你别看它小,它还在继续往上爬。那小芽慢慢地爬着,如果稍有闪失,一不留神滑了一脚它就永远也爬不上去了。所以它只有小心翼 相似文献
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