Magnetic properties of Compressed amorphous powder cores and their application to DC-DC converters.

采用具有高淬熄速率和大规模生产潜力的新型雾化工艺“旋转水雾化工艺（SWAP）"制备了软磁性能优异的铁基非晶粉末颗粒。此外，这些非晶颗粒绝缘的玻璃细粉和压制成环形，E-和罐形的核心热压技术在相对较高的温度条件下低于结晶温度。所制备的磁粉芯具有比市售粉末磁粉芯更优越的上级磁性能。矫顽力为一半，并且在300 Oe下的磁通密度B_m高30%。初始磁导率在1 MHz时约为90-110，100 kHz时B_m=0.1 T时的铁损为660 kW/m^3。前者与Sendust相当，后者低20%。将所得到的非晶磁芯应用于工作在100 kHz的DC-DC转换器。在输出功率高达300 W的转换效率检查是高于转换器使用一个典型的商业Sendust核心和一个单一的间隙铁氧体磁芯。此外，还研究了感应充电器用带间隙罐形磁芯的磁性能。对于间隙大于1.5mm的磁芯，非晶磁粉芯的损耗低于铁氧体磁芯。

Fe-based amorphous powder particles with excellent soft-magnetic properties were fabricated by our new atomization process "spinning water atomization process(SWAP)", which has both a high quenching rate and mass- production potential. In addition, these amorphous particles were insulated by glass fine powder and pressed into toroidal, E- and pot-shaped cores by hot-pressing techniques at relatively high temperature conditions below crystallization temperature. The cores fablicated had superior magnetic properties compared with commercial Sendust powder core. The coercive force was half and the flux density B_m at 300 Oe was 30% higher. The initial permeability up to 1 MHz was about 90-110, and the core loss at 100 kHz for B_m=0.1 T was 660 kW/m^3. The former was comparable to that of Sendust and the latter was 20% lower. The amorphous cores obtained were applied to DC-DC converters working at 100 kHz. The conversion efficiency examined at out put power up to 300 W was higher than that of converters utilizing a typical commercial Sendust core and a single gapped ferrite core. Furthermore, the magnetic properties of gapped pot-shped core for inductive charger were also studied. For the cores with a gap of above 1.5mm, the loss of amorphous powder core exhibited lower than that of ferrite.