简介：AnewFB-ZVT-PWMconverterisproposed.ThenewconverteroperatesatafixedfrequencyandimplementsZVSforpowerdeviceswithoutincreasingvoltageinbothturn-onandturn-offtransient.A80kHz/50WFB-ZVT-PWMboostconverterusingMOSFETsisanalysedtheoretically.

简介：Thezero-voltagequasi-resonantboostswitchingDC-DCconverterhasbeeninves-tigatedbyusingthetimeaveragingequivalentcircuitapproachofperiodicallyswitchinglinearnetworks.TheDCsteadystateandACsmallsignalcharacteristicsoftheconverterarealsogiven.

简介：飞兆半导体公司推出具高效率和出色热性能，并有助实现更薄、更轻和更紧凑的电源解决方案的MOSFET产品系列，可应对工业、计算和电信系统对更高效率和功率密度的设计挑战。

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简介：文中对宜普电源转换公司（EPC）Buck转换器EPC9107进行参数测试与分析。测试结果表明,当EPC9107电源模块工作于开关频率1000kHz、宽幅输入电压12-28V时,输出电压恒定3.3V,输出电流约为0-16A,效率最高约为96.1%,功率密度约为14W·cm^-3,转换时间小于4ns,具有良好的抗干扰度和瞬态响应,纹波小于20mV。该模块的整体性能均优于当前硅基DC/DC电源模块。

简介：目前,开关电源以小型、轻量和高效率等特点被广泛应用于几乎所有的电子设备,电源系统通常被称为＂心脏系统＂,有着其他系统不可比拟的重要地位。随着科学技术的发展,各种用电装备系统对于电源的要求也越来越高,电源组件直接影响着装备系统的体积、重量和可靠性。文章以一个小型化隔离型双路输出DC/DC变换器作为设计实例,通过对实际电路的分析,详细说明其工作原理及主要器件的取值或计算方法。

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简介：<正>凌力尔特推出同步降压-升压型DC/DC控制器LT3790,采用单个器件就可提供高达250W功率。LT3790的4.7V至60V输入电压范围使其非常适合多种汽车和工业应用。其输出电压可设定在0V至60V,从而非常适合用作电压稳压器或电池/超级电容器充电器。LT3790的内部4开关降压-升压型控制器采用高于、低于或等于输出电压的输入电压工作,使其成为汽车等应用

简介：BasedontheanalysisofDCcharacteristicsofsiliconbipolartransistorsatlowtemperature,DCanalyticmodelsofECLcircuitatlowtemperaturearederived,thencomparedwiththeexperimentaldataandcomputersimulationresults.ThemodificationofSPICEBJTmodelabouttemperatureanddesignoflowtemperatureECLcircuitarediscussed.

简介：Inordertorealizethemodulardesignofthemicrogrid,thispaperproposedanewmodulartopologyfortheAC-DCmixedmicrogrid.Inthattopology,theACmicrogridunitandtheDCmicrogridunitwerepackagedtogetherbytheback-to-backconverter.Thebattery-supercapacitorhybridenergystoragesystemwasconnectedtotheDCbusofback-to-backconverter.Bythereasonabledesignonthebattery-supercapacitorhybridsystem,theenergystoragesystemcouldsupplytherapidpowerandenergysupportforthemicrogridspontaneously.Themathematicalmodelandthecontrolalgorithmofthatmicrogridtopologywerestudied.Bythesimulationanalysis,itcanbeconcludedthatAC-DCmixedmodularmicrogridtopologycouldoperatesteadilyonboththegrid-connectedmodeandtheisolatedmode.Furthermore,wecanconcludebythesimulationthatthedesignedmodularmicrogridcouldoperateuninterruptedwhenthemicrogridtopologyswitchedfromthegrid-connectedmodetotheisolatedmode.Theseamlessswitchingbecamethenaturalpropertyforthemodularmicrogrid.Asaresult,themodularmicrogridtopologycanbeconsideredasausualpower/loadmoduletorealizethefriendlypowerinteractionwiththepowergrid.

简介：In_2O_3∶SnO_2(ITO)thinfilmswerefabricatedonthesubstrateofflexiblepolyethyleneterephthalate(PET)byDCmagnetronsputteringfromaceramictargetofIn_2O_3/SnO_2(90∶10).PropertiesofthethinfilmswerecharacterizedbyX-raydiffraction(XRD),four-pointprobe,Hall-effectmeasurement,UV-Visspectrophotometer,andscanningelectronmicroscopy(SEM).Theeffectsofsputteringpressure,oxygenpartialpressureanddepositiontemperatureonpropertiesofmicrostructureandoptoelectronicspropertiesofPET/ITOthinfilmswereinvestigatedindetail.High-qualityITOthinfilmsonPETsubstrateswiththeresistivityaslowas8.5×10-4Ω·cmandtheopticaltransmittanceover80%inthevisiblespectrumrangewereobtained.

简介：WeproposeaBPNNbasedadaptiveslidingmodecontrolschemeforspeedtrackingofaDCmotorwithunknownsystemnonlinearities.Theinput-outputlinearizationtechniqueisusedtocancelthenonlinearities,andoutputoftheBPNNisincorporatedintothecontrollerintheproposedscheme.ItisshownthattherotorspeedofaDCmotorcanfollowanyarbitrarilyselectedtrajectoriesundervariableloadtorque.Thentheapplicationoftheapproachistestedviacomesimulations.

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简介：<正>飞兆半导体(Fairchild)日前宣布推出采用SO-8封装的80VN沟道MOS-FET器件FDS3572,能同时为DC/DC转换器的初级和次级同步整流开关电源设计提供优异的整体系统效率。FDS3572提供7.5nCMiller电荷(Qgd),比相

简介：Inthispaper,wedemonstratetheacetylehe(C2H2)sensorwithhighsensitivityusingahollow-corephotonicbandgapfiber(HC-PCF).ExperimentsformeasuringC2H2concentrationsingasmixtureareperformed.Usinga2m-longHC-PCFasgascell,thespectrumofacetyleneatn1+n3bandhasbeenmeasured,andtheP11-branchhasbeenselectedforthepurposeofsensing.Aminimumdetectivityof143partspermillionbyvolume(ppmv)forthesystemconfigurationisestimated.

简介：Soft-switchingtechniquesareattractivetounity-power-factorAC/DCconverterintheviewofthesizereductionandEMIsuppression.Asoft-switchedboostPFCconverterhasbeenstudiedbasedonitstopologyanalysis,PSIMsimulationandcircuitexperiment.Aspeciallimitationofsoft-switchingtechniqueshasbeenfoundintheirAC/DCapplications.

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简介：<正>据《今日电子》2003年4期报道,InternationalRecitifer公司推出新型WARP2600V/50A,35A和20A不穿通(NPT)的IGBT,改善了大电流开关电源(SMPS)的关断性能。WARP2IGBT和HEXFRED二极管共同封在一起,采用IR的薄硅晶片技术制造,能保证少数载流子的耗尽时间更短,从而加快关断,可以忽略关断尾巴电流,关断开关损耗

简介：有消息称，在即将摊出的新产品中，金山毒霸将放弃合作长达一年之久的俄罗斯Dr.Web引擎，全面启用自行开发的新引擎。同时，新产品一改以前以按年号命名的习惯(如金山毒霸2003)，将被命名为金山毒霸V。从诞生之日起就高举双引擎杀毒大旗的金山毒霸，正在经历一次脱胎换骨的重大改变，而事实