Ferrite, and transformer and method for driving it

A ferrite and transformer technology, applied in the field of driving the transformer, driving the transformer, can solve the problem that the magnetic core loss cannot be reduced, etc.

Inactive Publication Date: 2005-06-15
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the Mn-Zn-Co ferrite in JP-A Hei-8-191011 is still problematic in that the core loss therein cannot be reduced satisfactorily in the driving temperature range of 50-70°C. level, so further research is required

Method used

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  • Ferrite, and transformer and method for driving it
  • Ferrite, and transformer and method for driving it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Weigh each base ingredient Fe at the predetermined content shown in Tables 1 and 2 2 o 3 , MnO and ZnO, wet mixed, and then calcined in air at 850°C for 2 hours. According to the amount of the basic component, a predetermined amount of the secondary component SiO is added to the resulting mixture 2 , CaCO 3 , Nb 2 o 5 and ZrO 2 , wet ball milling to obtain a ferrite powder. To this powder was added 0.8% by weight of PVA binder based on its solid content, and granulated. The obtained pellets were formed into a ring shape (outer diameter: 24 mm, inner diameter: 12 mm, thickness: 5.5 mm) under a pressure of 1 ton / cm2. Put the molded body in the N that controls the partial pressure of oxygen 2 -O 2 In the atmosphere of the mixed gas, firing was carried out at a firing temperature of 1300° C. for 5 hours. In this way, a toroidal core having an outer diameter of 20 mm, an inner diameter of 10 mm, and a thickness of 5 mm was obtained. The composition of the final fe...

Embodiment 2

[0144] In the same manner as in Example 1, ferrite core samples (ring cores) for transformers each having a composition shown in Table 3 were prepared. Also, in the same manner as in Example 1, Bs in these samples was measured.

[0145] The resulting data are in Table 3.

[0146] table 3

[0147] Sample Basic component (mol%) Subcomponent (ppm) Bs(120℃)

[0148] No. Fe 2 o 3 ZnO MnO SiO 2 CaCO 3 Nb 2 o 5 ZrO 2 (mT)

[0149] 201 54.2 6.0 39.8 100 800 300 250 428

[0150] 202 54.4 5.0 40.6 100 800 300 250 438

[0151] 203 54.5 4.5 41.0 100 800 300 250 438

[0152] In the samples of the present invention, Bs decreases linearly as the ambient temperature increases from 100°C to 110°C to 120°C. From the data in Table 3, it can be seen that the Bs in these samples is not lower than 410 mT in the range of 100-120°C. The core losses in these samples were low at temperatures of 100-110°C.

Embodiment 3

[0154]In the same manner as in Example 1, ferrite core samples (ring cores) for transformers each having a composition shown in Tables 4 and 5 were prepared. Also, in the same manner as in Example 1, Bs in those samples was measured. However, in this example, the samples were tested at an ambient temperature between 20°C and 120°C. Tables 4 and 5 show the data of Bs and the temperature dependence coefficient of Bs, dBs / dT (T=20~120°C). figure 2 Represent in sample No.301 (sample of the present invention, same as sample No.103 in embodiment 1) and in conventional sample (sample No.309, sample No. 106 same), the graph of the temperature-dependent change of Bs.

[0155] Table 4

[0156] Sample Basic component (mol%) Subcomponent (ppm) Bs(120℃) dBs / dT

[0157] No. Fe 2 o 3 ZnO MnO SiO 2 CaCO 3 Nb 2 o 5 ZrO 2 (mT) (T=20 to 120℃)

[0158] 301 54.0 8.0 38.0 100 800 300 250 428 -1.55

[0159] 302 54.1 7...

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Abstract

The invention provides: a kind of Mn-Zn ferrite, at high temperature, the magnetic core loss in the ferrite is low, and Bs is high; a kind of transformer that can be miniaturized and suitable for use under high temperature; an effective drive method for the transformer. At the same time, a transformer that can be miniaturized and is suitable for use in a wide temperature range including high temperature is provided. Also provided are a high-efficiency transformer capable of miniaturization, in which a core loss in a ferrite core is low and a saturation magnetic flux density is high at a temperature at which the transformer is driven; and a high-efficiency driving method for the transformer. The transformer magnetic core is made of Mn-Zn ferrite whose composition is as stated in the specification.

Description

technical field [0001] The present invention relates to a Mn-Zn ferrite suitable for a transformer core, wherein the core loss is low at high temperature and the saturation magnetic flux density is high, and the present invention also relates to a transformer having a Mn-Zn ferrite core for use in To switch the power supply of the converter and the display, the present invention also relates to a method for driving the transformer. [0002] The present invention also relates to a transformer with a Mn-Zn ferrite core, wherein, when the driving temperature range is between 50°C and 70°C, the core loss is low and the saturation magnetic flux density is high. The present invention also relates to a drive method of the transformer. Background technique [0003] Mn-Zn ferrite is widely used as a material for transformers in various communication equipment, household or industrial equipment, and the like. The temperature of the transformer in the traditional switching power supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00C04B35/26C04B35/38H01F1/34H01F27/255
CPCC04B35/2658C04B2235/3232C04B2235/3244C04B2235/3251C04B2235/3262C04B2235/3275C04B2235/3277C04B2235/3284C04B2235/3293C04B2235/3418C04B2235/604H01F1/344H01F27/255
Inventor 齐田仁黑田朋史冈本重夫佐藤直义
Owner TDK CORPARATION
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