The essential difference between soft saturation and hard saturation lies in magnetic-core material. The soft saturation inductor is made of powder-core, and the hard saturation inductor is made of the ferrite-core. The DC bias characteristics of the two are different, and the inductor should be selected according to its specific applications. The ferrite-core with hard saturation is more suitable for higher frequency, and the powder-core with soft saturation is more suitable for lower frequency (Less than 300kHz）.