| 摘要 |
PURPOSE:To restrain loss even in the case of application to a power supply transformer for high frequency switching of 100kHz or higher, by adding a specified component to a specified fundamental component and compounding them. CONSTITUTION:Fundamental component is Fe2O3 of 52-54mol%, MnO of 33-37mol%, and ZnO of 8-13mol%. The following are added to and compounded with the fundamental component; SiO2 of 0.008-0.30wt.%, CaO of 0.02-0.15wt.%, niobium oxide of 0.01-0.08wt.%, and tungsten oxide and/or molybdenum oxide of 0.02-0.20wt%. The operating temperature of a transformer for a switching power supply is usually 60-70 deg.C, and therefore it is desirable that the iron loss is low in said temperature range and has negative temperature dependency up to the temperature range of 80-120 deg.C where the operating temperature exceeds the room temperature. From this viewpoint, the compound ratio of Fe2O3, MnO and ZnO is desirable to be in the above range. Hence the loss is reduced in the case of application to a transformer for a high frequency power supply whose switching frequency is higher than or equal to 100kHz. |
