| Autor: |
Tsorng-Juu Liang, S.K. Changchien, H.W. Shieh, Chuan-Kuei Huang, H.H. Nien |
| Rok vydání: |
2006 |
| Předmět: |
|
| Zdroj: |
2006 IEEE Power India Conference. |
| DOI: |
10.1109/poweri.2006.1632595 |
| Popis: |
Simultaneous introduction of CaO, Co/sub 2/O/sub 3/ and MoO/sub 3/ dopants into low loss manganese-zinc soft ferrites remarkably improves the power loss characteristic of the ferrite cores. Since the driving frequency of switching power supplies has been raised from several kHz to more than 1 MHz, the power loss of the magnetic devices must be reduced. The eddy current loss of soft ferrite will take a major proportion of iron loss in these high-frequency switching power supplies. An attempt was made to develop low loss Mn-Zn polycrystalline ferrites by increasing resistivity to decrease eddy current loss. Doped Mn-Zn ferrites were prepared by conventional ceramic technique and sintered at the temperature of 1320/spl deg/C for 1-8 hours respectively in air. The DC resistivity was measured by using four-probe methods on sintered disks whose sides were polished and coated with a thin layer of silver paste as a good contact material. The magnetic permeability at room temperature was measured by using an impedance analyzer (Hewlett-Packard, Model HP4294A) with HP-16047 test fixture. The core loss of Mn/sub 0.58/Zn/sub 0.37/Co/sub 0.01/Fe/sub 2.04/O/sub 4/ ferrite doped with 0.08 wt% MoO/sub 3/ is 370 mW/c.c at 500 kHz/70 mT. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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