With　development　toward　high-efficiency　and　high-power-density　of　power　supplies,　how　to　reduce　the　sizes　of　magnetic　components　becomes　more　and　more　critical.　Flux　saturation　of　magnetic　materials　is　a　key　problem　to　limit　the　core　size　reduction,　especially　for　the　applications　to　high　current　DC　inductors.　Using　permanent　magnet　to　counteract　the　DC　flux　produced　by　inductor　winding　current　had　become　a　research　tendency,　in　addition　to　develop　new　magnetic　materials　with　higher　saturation　property.　Existed　magnet　bias　methods　and　the　inadequacies　in　high-frequency　applications　were　discussed.　Then　a　novel　inductor　structure　with　magnet　was　developed　and　its　magnetic　circuit　design　consideration　was　also　proposed.　The　novel　structure　could　not　only　increase　the　inductor＇s　DC　current　carrying　abilities　or　reduce　the　magnetic　component　size,　but　also　avoid　the　magnet　of　being　over-heated　by　high-frequency　eddy　current　effect　and　being　demagnetized　by　rushing　pulse　currents.　Field　simulations,　sample　design　and　tests　verifies　the　theoretical　analysis　and　effectiveness　in　practical　applications.　©　2011　Chinese　Society　for　Electrical　Engineering.