CHARACTERISTICS OFA NEWSERIESRESONANT CONVERTER

CIRCUIT OPERATION Thispaperdescribes a newseriesresonant converterfora 150-volt dcpowersupplysystem.This converter hasbeenstudiedinordertoovercome the disadvantage ofconventional seriesresonant converterswhichmustwidelyvarytheconversion frequency tokeeptheoutputvoltageconstant, thuscausing audiblenoiseunderlight-load conditions. A seriesresonsnt circuitisaddedparallel to theoutputcircuitoftheconventional converter. By utilizirng theimpedance characteristics oftheadditionalcircuit, theoutputvoltagecanberegulated withlessconversion frequency variation thaninconventional circuits. Fromexperimental results, theconversion frequencyvariation necessary tokeeptheoutputvoltage constantina O-to-100 ampereoutputcurrentrange wasfoundtobeonlyabout30%ofthatofconventional circuits. Theconversion efficiency ofthisconverter isabout85%at 100ampereoutputcurrent.