We have offered a choke coil and transformer that were made high power density and low loss, by the method as follows. Therefore, permanent magnet is inserted in the magnetic circuit of the choke coil, transformer so that magnetic flux of permanent magnet might act on the reverse direction of the magnetic flux generated by the excitation winding of the choke coil, transformer. Using the Sm-series magnetic material of high Tc, high iHc, has made reflow possible and has solved the task concerned with the demagnetization.
展开▼
