简介:Inthispaper,onthebasisofthephase-shiftedcontrolledzero-voltage-switch(ZVS)full-bridgeconverterwithpulsewidthmodulation(PWM),anovelzero-voltageandzero-currentswitch(ZVZCS)PWMconverterusingasimpleauxiliarycircuitwasdesigned.TheZVZCSsoftswitchisachievedbytheresonanceamongtheresistingelectromagneticdeflectioncapacitor,thecapacitorofthesimpleauxiliarynetworkandtheleakageinductoroftransformer.Therearenodissipationdevicesofthesaturationinductorandtheauxiliaryswitchintheconverter,meantimethecapacitoroftheauxiliarycircuitisalsousedtoclampthevoltageoftherectifier,andthereisnoadditionalclampedcircuit.Thereisnobigcirculatingcurrentintheconverter,alltheactiveandpassivedevicesworkontheconditionofthelowcurrentandvoltagestress,andtheproposedconverterhaswideloadrangeandsmalldutyloss.
简介:ThesoftswitchingareweldinginverterreducesswitchinglossesandimprovesoperatingenvitonmentofdevicesbyusingZero-Voltage-Transition(ZVT)technique.Step-by-stepanalysisofeachtimingintervalandtheassociatingvoltageandcurrentwaveformsareincludedfortheFull-BridgeZero-Voltage-SwitchedPWMcomerter,Numerousdesignequationssupportingthephase-shiftedsoftswitchingtechniquearehighlighte.
简介:Full-bridgeZero-Voltage-SwitchPWMconvertercombinesadvantagesofthePWMcontroltechniqueandresonanttechnique.However,FullZVSisachievedonlyunderlargeloadcurrentbecauseresonanttankofthiscircuitismadeupoftheparasiticcapacitanceofthepowersemiconductorsandtheleakageinductorofthetransformerprimary.Inthispapertwosaturableinductorsasmagneticswitchesareaddedtosecondary,sooutputinductorisalwaysreflectedtoprimaryandassistsresonanttransition.FullZVSisachievedunderlowerloadcurrent.Theabove-mentionedinvestigatedresultsarevalidatedbythecomputerizedsimulationandhardwarecircuitexperiment.