Voltages　across　magnetic　components　of　power　converters　are　generally　pulsewidth　modulation　(PWM)　waveforms,　whereas　the　parameters　of　present　magnetic　core　loss　models　are　often　tested　under　sinusoidal　excitation　by　most　magnetic　material　manufacturers.　This　leads　to　a　significant　difference　with　a　PWM　excitation　and　then　impacts　the　testing　accuracy　of　inductor　losses.　A　testing　device,　based　on　dc　law,　has　been　designed　to　generate　different　kinds　of　PWM　waveforms,　and　a　corresponding　testing　scheme　is　proposed　to　accurately　measure　total　inductor　losses　of　different　inductances　with　high　frequency　PWM　excitations.　Finally,　experiments　have　been　conducted　to　verify　the　effectiveness　and　correctness　of　the　proposed　scheme.　The　results　show　that　the　proposed　testing　scheme　can　accurately　test　the　total　inductor　loss.　Moreover,　the　proposed　loss　model　of　the　testing　device　is　in　exact　agreement　with　the　actual　device＇s　loss　with　the　fitting　error　within　1%,　ensuring　the　accuracy　of　the　proposed　testing　scheme.