Magnetic　core　loss　is　one　of　the　important　parameters　of　power　magnetic　components.　In　view　of　the　problem　that　AC　power　method　has　a　large　error　in　measuring　the　core　loss　at　high　frequency　and　low　loss　angle,　as　well　as　the　disadvantages　of　calorimetric　method,　such　as　high　time　cost　and　tedious　measurement　process,　DC　power　method　is　proposed.　The　DC　method　obtains　magnetic　core　loss　by　measuring　DC　input　power　of　inverter　circuit,　greatly　weakening　the　impact　of　impedance　angle　of　the　measured　magnetic　component　on　measurement　accuracy,　and　can　accurately　measure　magnetic　core　loss　under　PWM　wave　excitation.　This　article　conducts　research　on　the　following　aspects:　Firstly,　based　on　the　DC　power　method,　this　article　measured　the　losses　of　magnetic　cores　under　asymmetric　PWM　wave　and　symmetric　PWM　wave　excitation,　established　a　prediction　model　for　magnetic　core　losses,　and　verified　the　accuracy　of　the　model.　Verify　the　existence　of　relaxation　loss　when　measuring　the　magnetic　core　loss　under　symmetric　PWM　wave　excitation,　and　establish　a　relaxation　loss　prediction　model.　©　2023　IEEE.