This　paper　presents　a　soft-switched　high-voltage　gain　Y-quasi-Z　source　DC-DC　converter,　which　integrates　the　advantages　of　quasi-Z　source　networks,　Y　source　networks,　and　switched　capacitor　networks.　The　proposed　converter　achieves　zero　voltage　switching　(ZVS)　for　all　active　devices　by　replacing　the　diode　in　the　quasi-Z　source　network　with　a　switch.　Besides,　the　proposed　converter　has　the　advantages　of　continuous　input　current,　a　common　ground　between　input　and　output　voltage,　an　active　clamp　loop　that　absorbs　voltage　spikes　caused　by　the　leakage　inductor,　diodes　zero　current　switching　(ZCS)　that　eliminates　the　reverse　recovery　loss,　high　voltage　boost　capability,　and　high　efficiency.　The　operating　modes　and　steady　states　are　analyzed　in　detail.　The　efficiency　calculation　and　power　dissipation　are　studied.　Then,　comparisons　between　converters　and　component　designations　are　presented.　Finally,　a　160-W　prototype　made　in　the　laboratory　verified　that　when　the　input　voltage　is　48　V,　the　output　voltage　can　be　enhanced　to　380　V　and　the　efficiency　is　96.89%,　while　its　corresponding　hard-switched　converter　is　94.71%.　The　tested　waveforms　agree　well　with　the　theoretical　analysis.　©　2025　John　Wiley　&　Sons　Ltd.