Magnetic core for transformer, Mn-Zn based ferrite composition and methods of producing the same
AssigneeTDK Corporation
InventorsYuji Sezai, Ippou Hirai, Masahiko Watanabe
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Abstract
An Mn-Zn based ferrite composition having a main component comprised of Fe2O3: 51.5 to 54.5 mol %, ZnO: 19.0 to 27.0 mol % and the rest of substantially MnO and a first sub component comprised of 0.002 to 0.040 wt % of Sio2, 0.003 to 0.045 wt % of CaO and 0.010 wt % or less of P with respect to 100 wt % of the main component. In a magnetic core for a transformer comprised of this composition, the THD of the transformer becomes −84 dB or less in a broad frequency band, so it can be preferably used as a magnetic core, for example, for an XDSL modem transformer.
Claims30
An Mn-Zn based ferrite composition having a main component comprised of Fe 2O3:
- 51.5 to 54.5 mol % and ZnO:
- 19.0 to 27.0 mol % and the rest of substantially MnO, and
- a first sub component comprised of 0.002 to 0.040 wt % of SiO2, 0.003 to 0.045 wt % of CaO and 0.010 wt % or less of P with respect to 100 wt % of said main component.
An Mn-Zn based ferrite composition, having a main component comprised of Fe2O3:
- 51.5 to 54.5 mol % and ZnO:
- 19.0 to 27.0 mol % and the rest of substantially MnO, and
- a first sub component comprised of 0.002 to 0.040 wt % of SiO2, 0.003 to 0.045 wt % of CaO and 0.010 wt % or less of P with respect to 100 wt % of said main component, and
- a second sub component comprised of at least one selected from 0.050 wt % or less (excluding 0) of Nb2O5, 0.100 wt % or less (excluding 0) of Ta2O5, 0.500 wt % or less (excluding 0) of SnO2, 0.500 wt % or less (excluding 0) of TiO2, 0.500 wt % or less (excluding 0) of In2O3 and 0.150 wt % or less (excluding 0) of Sb2O3 with respect to 100 wt % of said main component.
An Mn-Zn based ferrite composition, having a main component comprised of MnO:
- 22.0 to 39.0 mol % and ZnO:
- 7.5 to 25.0 mol % and the rest of substantially Fe2O3, and
- a third sub component having 0.02 to 0.50 wt % of Co oxide in CoO conversion with respect to 100 wt % of said main component.
An Mn-Zn based ferrite composition, having a main component comprised of MnO:
- 22.0 to 39.0 mol % and ZnO:
- 7.5 to 25.0 mol % and the rest of substantially Fe2O3, and
- a third sub component having 0.05 to 0.50 wt % of Co oxide in CoO conversion with respect to 100 wt % of said main component.
An Mn-Zn based ferrite composition, having a main component comprised of MnO:
- 22.0 to 34.5 mol % and ZnO:
- 12.0 to 25.0 mol % and the rest of substantially Fe2O3, and
- a third sub component having 0.02 to 0.50 wt % of Co oxide in CoO conversion with respect to 100 wt % of said main component.
A magnetic core for a transformer having a main component comprised of Fe2O3:
- 51.5 to 54.5 mol %, ZnO:
- 19.0 to 27.0 mol % and the rest of substantially MnO, and
- a first sub component having 0.002 to 0.040 wt % of SiO2, 0.003 to 0.045 wt % of CaO and 0.010 wt % or less of P with respect to 100 wt % of said main component.
A magnetic core for a transformer, having a main component comprised of Fe2O3:
- 51.5 to 54.5 mol % and ZnO:
- 19.0 to 27.0 mol % and the rest of substantially MnO, and
- a first sub component having 0.002 to 0.040 wt % of SiO2, 0.003 to 0.045 wt % of CaO and 0.010 wt % or less of P with respect to 100 wt % of said main component,
- a second sub component comprised of at least one selected from 0.050 wt % or less (excluding 0) of Nb2O5, 0.100 wt % or less (excluding 0) of Ta2O5, 0.500 wt % or less (excluding 0) of SnO2, 0.500 wt % or less (excluding 0) of TiO2, 0.500 wt % or less (excluding 0) of In2O3 and 0.150 wt % or less (excluding 0) of Sb2O3 with respect to 100 wt % of said main component.
A magnetic core for a transformer, having a main component comprised of MnO:
- 22.0 to 39.0 mol % and ZnO:
- 7.5 to 25.0 mol % and the rest of substantially Fe2O3, and
- a third sub component having 0.02 to 0.50 wt % of Co oxide in CoO conversion with respect to 100 wt % of said main component.
A magnetic core for a transformer, having a main component comprised of MnO:
- 22.0 to 39.0 mol % and ZnO:
- 7.5 to 25.0 mol % and the rest of substantially Fe2O3, and
- a third sub component having 0.05 to 0.50 wt % of Co oxide in CoO conversion with respect to 100 wt % of said main component.
A magnetic core for a transformer, having a main component comprised of MnO:
- 22.0 to 34.5 mol % and ZnO:
- 12.0 to 25.0 mol % and the rest of substantially Fe2O3, and
- a third sub component having 0.02 to 0.50 wt % of Co oxide in CoO conversion with respect to 100 wt % of said main component.
Dependencies are inferred from the claim text.