The ac performance will be evaluated in the future, and some
preliminary results are reported herein. In order to compare the
ac winding loss and core loss of the CFI with the commercial
product, the structures shown in Fig. 6(a) and (c) were simulated
under 500 kHz frequency and 1-A-peak ac current with the same
properties of the material. Preliminary simulation results are
shown in Table II. While the volume of the CFI was two times
smaller than that of the commercial inductor, the simulated core
loss of the CFI was 40% smaller. The ac flux distribution was
similar to that of the dc simulation shown in Fig. 6(b) and
(d); the CFI had a more evenly distributed ac flux density than
the commercial product.