Based　on　the　finite-element　analysis　software　Ansys　Maxwell,　this　article　proposed　a　simulation　method　for　the　core　losses　of　pulsewidth　modulation　wave　voltage　excitation　with　dc　bias　which　solves　the　problem　of　core　losses　calculation　of　magnetic　components　with　different　core　structures　in　power　converters.　This　article　points　out　that　the　two　key　factors　for　core　losses　simulation　are　the　magnetic　properties　of　magnetic　material　and　the　magnetic　flux　density　distribution　inside　the　core.　The　measurement　and　modeling　of　different　magnetization　curves　and　core　losses　are　analyzed,　which　are　essential　conditions　for　accurate　core　losses　simulation.　Meanwhile,　a　decoupling　and　calculation　strategy　for　dc　magnetic　flux　density　and　ac　magnetic　flux　density　peak　value　within　the　core　are　proposed　to　ensure　effective　implementation　of　core　losses　simulation,　and　the　core　losses　can　be　obtained　with　field　calculator　based　on　an　accurate　core　losses　model.　Furthermore,　the　article　also　provides　a　detailed　analysis　of　the　main　simulation　errors　sources　and　proposes　corresponding　solutions.　Finally,　the　core　losses　of　ferrite　magnetic　ring　and　EE　shaped　magnetic　core　are　analyzed　and　calculated　using　the　proposed　simulation　method,　and　calculated　results　are　compared　with　measurement　results　to　verify　accuracy.