New MnZn ferrite with high saturation flux density, Bs was developed as a material suitable for transformer cores built into fly-back mode power supplies. Addition of NiO into the ternary Mn-Zn-Fe-O system requires higher Fe content to keep the temperature of minimum iron loss at around 100°C, compared to the original composition. This modification results in enhancement of Bs at 100°C. The new product “MB1H” was realized by choosing optimal composition so that Bs becomes high and iron loss is moderate. The transformer made with MB1H, designed to generate the same output power as ones with conventional materials, has proved to increase saturation flux density 20% at 100°C and to reduce 30% in volume.
