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Mn-Zn series feerite, magnetic core for transformer and transformer

A ferrite and transformer technology, applied in the direction of transformer/inductor core, magnetic bias transformer, transformer/inductor coil/winding/connection, etc., can solve the problem of insufficient magnetic characteristics and improve DC superposition characteristics , the effect of improving the DC superposition characteristics

Inactive Publication Date: 2006-07-26
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the ferrites described in the above-mentioned patent documents are not sufficiently good in magnetic properties when DC bias is superimposed over a wide stable range.

Method used

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  • Mn-Zn series feerite, magnetic core for transformer and transformer
  • Mn-Zn series feerite, magnetic core for transformer and transformer
  • Mn-Zn series feerite, magnetic core for transformer and transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] As an initial raw material for the main component, prepare Fe 2 o 3 , MnO, and ZnO. CoO and SiO are prepared as starting materials for subcomponents 2 , CaO or CaCO 3 , and P. These raw material powders were weighed to have the compositions shown in Table 1. The mass % of the subcomponent shown in Table 1 is a value when the main component is 100 mass %. In addition, regarding calcium oxide, as long as CaO or CaCO 3 Either of the two can be used as the amount converted from the reference weighing.

[0072] Table 1 shows the actual cobalt oxide content α (in terms of CoO), the lower limit "Y1" of the cobalt oxide content calculated by the formula (2), and the upper limit "Y2" of the cobalt oxide content calculated by the formula (3). ". The cobalt oxide content in Example 1 satisfies the above formula (1).

[0073] The raw materials weighed according to Table 1 were wet-mixed with a ball mill, dried with a spray dryer, calcined at 900° C. for 2 hours, and then w...

Embodiment 2～13

[0086] As shown in Table 1, in addition to iron oxide by Fe 2 o 3 51 to 54 mol% in conversion, 14 to 21 mol% in zinc oxide as ZnO, and 14 to 21 mol% in silicon oxide as SiO 2 Conversion in the range of 0.005% by weight to 0.025% by weight, calcium oxide in the range of 0.01% by weight to 0.10% by weight in terms of CaO (or CaO 3 Conversion in the range of 0.018% by weight to 0.18% by weight) and phosphorus (P) in the range of 0.0003% by weight to 0.01% by weight, except that it was carried out in the same manner as in Example 1, and a magnetic core sample of a ferrite composition was obtained. .

[0087] The cobalt oxide content α in Examples 2 to 13 satisfies the relationship Y1≤α≤Y2. In addition, regarding the content of silicon oxide, calcium oxide, and phosphorus, the amount near the upper limit of the above range is "∧", and the amount near the lower limit of the above range is "∨".

[0088] figure 2 a and figure 2 In b, the distribution of the composition (A, B) ...

reference example 1

[0115] In Reference Example 1, the silicon oxide content exceeds the upper limit of the range of 0.005 to 0.025% by weight ("#" is added to the column). In Reference Example 2, the silicon oxide content exceeds the lower limit of the range of 0.005 to 0.025% by weight ("*" is added to the column). In reference example 3, the content of calcium oxide exceeds the upper limit of the range of 0.01 to 0.10% by weight ("#" is added to the column). In Reference Example 4, the calcium oxide content exceeds the lower limit of the range of 0.01 to 0.10% by weight ("*" is added to the column). In Reference Example 5, the phosphorus content exceeded the lower limit of the range of 0.0003 to 0.01% by weight ("*" was added to the column). In Reference Example 7, the phosphorus content exceeds the upper limit of the range of 0.0003 to 0.01% by weight ("#" is added to the column).

[0116] In addition, in Reference Examples 1, 6, 7, and 8, "#" is added to the column where the primary partic...

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Abstract

A Mn-Zn based ferrite having a main component comprised of 51 to 54 mol% of an iron oxide in Fe203 conversion, 14 to 21 mol% of a zinc oxide in ZnO conversion and the rest of a manganese oxide, wherein a content (alpha[ppm]) of cobalt oxide in a CoO conversion with respect to 100 wt% of the main component satisfies a relation formula below. Relation formula: Y1 <= alpha <= Y2 ... (1). Note that Y1 and Y2 are expresses by the formulas below and CoO > 0[ppm]. Y1=(-0.13*B2+1.5*B-15.6A+850) / (0.0003)*B+0.0098)-233 ... (2), Y2=(-0.40*B2+4.6*B-46.7A+2546) / (0.0003*B+0.0098)+1074 ... (3). The A and B in the above Y1 and Y2 are A=Fe203(mol%) and B=ZnO(mol%).

Description

technical field [0001] The present invention relates to Mn-Zn-based ferrites, magnetic cores for transformers, and transformers. More specifically, it relates to Mn-Zn-based ferrites which are used for magnetic cores of transformers for communication, etc., and which are particularly excellent in DC superposition characteristics over a wide temperature range. , Transformer cores and transformers. Background technique [0002] Mn-Zn ferrite is the main magnetic material used as transmission ferrite for communication and ferrite for switching power supply because of its low initial magnetic permeability in the high frequency band and less increase in power loss when used as a power transformer. With the diversification of use environments due to the recent miniaturization and mobility of electronic equipment, there is a demand to reduce the temperature dependence of the characteristics of communication circuits using the same. [0003] In response to this demand, in order to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34H01F27/24C04B35/38C04B35/26H01F1/36H01F17/04H01F19/08H01F27/255H01F27/32
CPCH01F19/08C04B2235/604C04B2235/3284H01F27/324C04B2235/786C04B35/2658C04B2235/3262H01F17/04H01F1/36C04B2235/3275C04B35/62655H01F1/344C04B2235/42C04B2235/658C04B2235/3208C04B35/6261C04B2235/3251C04B2235/94C04B35/62625C04B35/63
Inventor 渡边雅彦安原克志
Owner TDK CORPARATION
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