156results about How to "Improve DC Superposition Characteristics" patented technology

The invention is comprised of a coil group arranging a plurality of terminal-integrated type coils (1), (4) formed by bending a metal sheet in a preset development form and having a predetermined positional relationship, and a magnetic material (7) burying therein the coil group. For example, axes of the plurality of coils (1), (4) constituting the coil group, are arranged in parallel wherein the center point of at least one coil selected from the plurality of coils (1), (4) and the center point of a coil other than the selected coil are in an staggered arrangement. Due to this, an array type choke coil can be realized which is thin overall and operable with a large current in a high frequency band.

Disclosed is a laminated inductor that has good direct current superimposition characteristics, does not cause a variation in temperature characteristics, suppresses the occurrence of delamination, and can be stably manufactured. Also disclosed are a method for manufacturing the laminated inductor and a laminated choke coil. A laminated inductor (10) for use as a choke coil in a power supply circuit includes a rectangular parallelepiped-shaped laminated chip (1) and at least one pair of external electrodes (8) that are provided at the end of the laminated chip (1) and are conductively connected to the end of a coil. The laminated chip (1) includes a plurality of magnetic material layers (3) formed of an Ni—Zn—Cu ferrite, a plurality of conductive layers (2), which are laminated through the magnetic material layers (3) to constitute a coil, and at least one nonmagnetic layer (4) formed of a Ti—Ni—Cu—Mn—Zr—Ag-base dielectric material and formed in contact with a plurality of the magnetic material layers (3).

A transformer that improves the DC superposition characteristic without incurring eddy-current losses. In the transformer, a part of a plate-like core opposing a top face of a flange of a drum core is formed with a first opposing portion opposing none of input and output terminals and a second opposing portion opposing the input and output terminals. A first gap is formed between the top face and the first opposing portion by a spacer. A second gap greater than the first gap is formed by a recess of the plate-like core provided so as to correspond to the second opposing portion. This allows magnetic fluxes to pass between the top face and the first opposing portion where the gap is formed and inhibits them from passing between the plate-like core and the input and output terminals where the second gap greater than the first gap is formed.

A chip inductor includes: a winding; a ferrite-based drum core having flange parts on both ends of a winding shaft around which the winding is wound; electrodes fixed to the flange parts on both ends of the winding shaft and for electrically connecting both ends of the winding to a mounting board; and a magnetic shield plate for connecting both flange parts in a region other than the electrodes wherein the magnetic shield plate is a plate member containing an iron-based amorphous powder.

A magnetic device includes a sheet-type coil including a planar conductive coil and an insulating substance; and a sheet-type first magnetic member disposed on at least one of upper and lower surfaces of the sheet-type coil, where a magnetic permeability of the insulating substance is smaller than a magnetic permeability of the first magnetic member. The magnetic device preferably includes a second magnetic member provided at a predetermined area of the sheet-type coil, the second magnetic member being made of a resin containing a magnetic powder and having a permeability larger than the insulating substance and smaller than the first magnetic member. The predetermined area is at least one position selected from a center portion and a peripheral portion of the sheet-type coil where a conductor constituting the planar conductive coil is not present. Further, a power supply module of the present invention includes the magnetic device according to the present invention.

An inductor component according to the present invention includes a magnetic core including at least one magnetic gap having a gap length of about 50 to 10,000 μm in a magnetic path, a magnet for magnetic bias arranged in the neighborhood of the magnetic gap in order to supply magnetic bias from both sides of the magnetic gap, and a coil having at least one turn applied to the magnetic core. The aforementioned magnet for magnetic bias is a bonded magnet containing a resin and a magnet powder dispersed in the resin and having a resistivity of 1 Ω·cm or more. The magnet powder includes a rare-earth magnet powder having an intrinsic coercive force of 5 KOe or more, a Curie point of 300° C. or more, the maximum particle diameter of 150 μm or less, and an average particle diameter of 2.0 to 50 μm m and coated with inorganic glass, and the rare-earth magnet powder is selected from the group consisting of a Sm—Co magnet powder, Nd—Fe—B magnet powder, and Sm—Fe—N magnet powder.

The invention discloses a method for preparing an iron silicon soft magnetic alloy powder core. The method for preparing the iron silicon soft magnetic alloy powder core comprises the steps of 1, melting an iron silicon alloy by adopting a rapid solidification strip casting furnace, and preparing the alloy into powder by using a ring hammer mill after rapid quenching; 2, mixing the powder with atomized iron silicon alloy powder, and sieving the resultant powder; 3, performing surface treatment on the powder in a protective atmosphere furnace; 4, adding phosphoric acid, deionizer water, isopropanol and normal silicate ester, mixing, stirring and drying in a frying way; 5, pressing the powder into the powder core by using a hydraulic press; 6, performing protective atmosphere heat treatment on the powder core; and 7, performing protective treatment on the surface of the powder core through the reinforcement of epoxy resin and the spray painting. The iron silicon soft magnetic alloy powder core prepared by the method is high in cost performance and has the advantages of direct current overlapping characteristic, high-frequency low-loss and good characteristic; and in addition, the better magnetic performance still can be kept under a high temperature.

The invention relates to a Ni-Mn-Zn ferrite and the preparation method, in particular to a high saturation magnetic flux density low Ni-Mn-Zn power loss ferrite and the preparation method. The main technical proposal of the invention is: the ferrite comprises components with the following molar percentage: Fe2O3:53 to 55mol%, MnO:35 to 37mol%, ZnO:5 to 8mol%, NiO:2 to 4mol%. The invention has an advantage of providing a high saturation magnetic flux density low Ni-Mn-Zn power loss ferrite with reasonable design, high saturation magnetic flux density, high frequency and low power loss.

Disclosed is an open magnetic circuit stacked coil component that is less likely to cause defects between a nonmagnetic layer and a magnetic layer, causes no significant deterioration in temperature characteristics of inductance, even when the thickness of the nonmagnetic layer is reduced, and has excellent direct-current superimposition characteristics. An open magnetic circuit stacked coil component (1) comprises a laminate (11), formed of magnetic layers (2) stacked on top of each other, a coil (L) provided within the laminate (11), and a nonmagnetic layer (4) provided within the laminate (11) so as to cross a magnetic path formed by energization of the coil (L). The nonmagnetic layer is formed of a nonmagnetic material of a Zn-Cu-based ferrite. The magnetic layer is formed of a magnetic material. The magnetic material comprises 100 parts by weight of an Ni-Zn-Cu-based magnetic ferrite material and 0.1 to 2.0 parts by weight, in terms of Co3O4, of Co added to the Ni-Zn-Cu-based magnetic ferrite material. According to the above constitution, the difference in firing shrinkage between the magnetic layer and the nonmagnetic layer can be reduced to suppress the occurrence of cracks and the like, and, even when Ni is diffused from the magnetic layer to thenonmagnetic layer upon firing, the temperature characteristics of the inductance are rendered flat.

The present invention provides a multilayer inductor capable of improving DC superposition characteristics and preventing a decrease in inductance value. The increase in magnetic flux density is suppressed by the magnetic flux pass suppression layer (11c) arranged so as to block the magnetic flux passing through the inside of the coil, so that magnetic saturation when a direct current is applied can be suppressed and the direct current superposition characteristic can be improved. Furthermore, by making the thickness of the coil central part where the magnetic flux passes through the suppressing layer (11c) thinner than the thickness of the conductor layer near part, it is possible to reduce the reluctance of the coil central part where the magnetic flux density is low, and prevent the inductance value from being affected by the reluctance. And lower.

There are provided a magnetic element capable of enhancing magnetic permeability of a magnetic member, improving a direct current superposition characteristic, and improving production efficiency and a method of manufacturing the magnetic element. The magnetic element includes a coil (30) formed of a conductor having an insulating film, a first core member (20) constituted of insulative soft magnetic ferrite and covering the coil (30), and a second core member (50) having soft magnetic metal powder as material and surrounded by the first core member (20). Furthermore, the magnetic element includes a third core member (40) which has soft magnetic metal powder as material and a higher filling ratio of the soft magnetic metal powder than the second core member 50 and is surrounded by the first core member (20).

The invention discloses a preparation method of FeSi alloy powder with high direct current superposition characteristics, and belongs to the technical field of alloy powder preparation. The FeSi alloypowder is mainly made of pure iron and metal silicon, and a small amount of manganese and chromium are added. The preparation method comprises the following steps of weighing the ingredients according to a specific proportion, carrying out non-vacuum melting to obtain the alloy melt of required components, and then atomizing to prepare alloy raw powder with an inert gas, obtaining fine powder after the raw powder is collected, screened and graded. According to the preparation method of FeSi alloy powder with high direct-current superposition characteristics, the alloy powder with uniform components and high purity can be obtained, and the powder spherical degree is high; the uniform and compact insulating layer can be easily formed after insulation coating, so that the contact of the alloy matrix is effectively blocked, and the pressed magnetic powder core has good direct-current superposition characteristics.

Provided are a composite soft magnetic material, having favorable DC bias characteristics and high specific resistance, and a production method therefor. An inorganic insulative powder (3) and a coated powder obtained by coating a soft magnetic powder (1) that is coated with an insulative film (4) with a silicone resin (2) are uniformly mixed, and the resultant mixture is molded and fired. By uniformly mixing the inorganic insulative powder (3) and the coated powder obtained by coating the soft magnetic powder that is coated with the insulative film (4) with the silicone resin (2), rupture of the insulative film due to the inorganic insulative material when molding pressed powder is prevented. By uniformly dispersing the inorganic insulative material while high specific resistance is maintained, the gap between molded soft magnetic powder particles is uniformly maintained. As a result, a composite soft magnetic material is provided having high specific resistance and favorable DC bias characteristics.

This multilayer coil part has a magnetic body section (2) that is made of an Ni-Zn system ferrite material and a Cu-based coil conductor (3) that has been wound into a coil shape. The coil conductor (3) is buried inside the magnetic body section (2) to form a part element body (1). The part element body (1) is divided into a first region (6) that is located close to the coil conductor (3) and a second region (7) that comprises the region other than the first region (6). The grain size ratio (D1/D2) between the average crystal grain size (D1) of the magnetic body section (2) in the first region (6) and the average crystal grain size (D2) of the magnetic body section (2) in the second region (7) is equal to or lower than 0.85. The molar quantity of CuO content in the ferrite material is set to 6 mol% or less, and the ferrite material is baked in a reductive atmosphere with the oxygen partial pressure being equal to or lower than the Cu-Cu2O equilibrium oxygen partial pressure. Thus, a multilayer coil part that exhibits not only little fluctuation of inductance and excellent thermal shock resistance when subjected to a thermal shock or an external stress but also excellent direct-current superposition characteristics can be obtained without requiring any complicated step.

The invention discloses a method for manufacturing a [mu]26 composite magnetic powder core. The technical scheme is as follows: after two or more alloy powders from mechanically crushed sendust, aerosolized sendust, aerosolized iron-silicon, aerosolized iron-nickel and aerosolized iron-nickel-molybdenum are selected and are fully mixed, phosphoric acid passivation treatment and drying are performed, then one or more from silicon oxide, aluminum oxide, calcium oxide and magnesia calcinata, sodium silicate, and deionized water are successively added to the alloy powders subjected to the passivation processing and drying for insulation coating, and afterwards, the [mu]26 composite magnetic powder core is prepared after press molding, heat treatment and surface coating. The alloy powders used in the method have the advantages of mature technology, stable performance and relatively low cost so that the prepared magnetic powder core has quite high cost performance and stability. Such oxides as the silicon oxide, the aluminum oxide, the magnesia calcinata and the like and such inorganic materials as the sodium silicate and the like are used for coating adhesion so that the obtained composite magnetic powder core has the advantages of high stability, high reliability, low cost, high safety and facilitated production.

An NiCuZn-base ferrite of the invention comprises as main components an iron oxide in an amount of 45.0 to 49.0 mol % on Fe2O3 basis, an copper oxide in an amount of 5.0 to 14.0 mol % on CuO basis and a zinc oxide in an amount of 1.0 to 32.0 mol % on ZnO basis with a nickel oxide accounting for the rest mol % on NiO basis. With respect to the main components, a bismuth oxide is contained in an amount of 0.25 exclusive to 0.40% by weight on Bi2O3 basis, and a tin oxide is contained in an amount of 1.00 to 2.50% by weight on SnO2 basis. The invention ensures a leap upward in direct-current bias characteristics.