MnZn power ferrite for MHz-level switching mode power supply and preparation method of MnZn power ferrite

A switching power supply and ferrite technology, which is applied in the manufacture of inductors/transformers/magnets, circuits, electrical components, etc., can solve the problems of high sintering temperature and high material loss, and achieve low sintering temperature, reduced loss, and low power loss. Effect

Active Publication Date: 2018-08-21
江西尚朋电子科技有限公司
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Problems solved by technology

The patent (application publication number CN102311263A) discloses "High-frequency, low-loss, high-Bs ferrite material for LED lighting and switching power supply transformers and its preparation method", its μ i =1800±25%, Bs...

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  • MnZn power ferrite for MHz-level switching mode power supply and preparation method of MnZn power ferrite
  • MnZn power ferrite for MHz-level switching mode power supply and preparation method of MnZn power ferrite
  • MnZn power ferrite for MHz-level switching mode power supply and preparation method of MnZn power ferrite

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Embodiment Construction

[0041] The high-frequency low-loss MnZn power ferrite material is composed of main materials and dopants. The main materials are calculated by mole percentage and calculated by oxides, including:

[0042] 52~56mol% Fe 2 o 3 , 5-11 mol% ZnO, 33-43 mol% MnO.

[0043] Dopants are calculated as oxides by weight percentage, including:

[0044] 0.05~0.1wt%CaCO 3 , 0.1~0.3wt% TiO 2 , 0.1~0.3wt% Co 2 o 3 , 0.01~0.1wt% SnO 2 , 0.01~0.1wt%V 2 o 5 .

[0045] The preparation method of high-frequency low-loss MnZn power ferrite material comprises the following steps:

[0046] (1) Main ingredient formula

[0047] Using 52~56mol% Fe 2 o 3 , 5 ~ 11mol% ZnO, 33 ~ 43mol% MnO;

[0048] (2) Ball milling once

[0049] Put the above powder into a ball mill, add equal weight deionized water, and ball mill for 2 hours

[0050] (3) pre-burning

[0051] Dry the ball mill material obtained in step (2), and pre-fire it in a furnace at 920°C for 2 hours;

[0052] (4) Doping

[0053] Add...

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Abstract

The invention relates to a MnZn power ferrite for a MHz-level switching mode power supply and a preparation method of the MnZn power ferrite and relates to the electronic material technology. The ferrite is prepared from a main material and a dopant. The main material comprises in molar percentage of oxide as follows: 52mol%-56mol% of Fe2O3, 5mol%-11mol% of ZnO and 33mol%-43mol% of MnO; the dopantcomprises in molar percentage of oxide as follows: 0.05wt%-0.1wt% of CaCO3, 0.1wt%-0.3wt% of TiO2, 0.1wt%-0.3wt% of Co2O3, 0.01wt%-0.1wt% of SnO2 and 0.01wt%-0.1wt% of V2O5. The loss of the materialat high MHz frequency is effectively reduced, and the power loss is lower in the wideband range of 0.5-3 MHz and in the temperature range of 25-100 DEG C. Meanwhile, the preparation method has the advantages of being low in sintering temperature, energy-saving and environmentally friendly.

Description

technical field [0001] The invention relates to electronic material technology, in particular to MnZn power ferrite material. Background technique [0002] Soft magnetic ferrite is an important basic material for electronic devices. Magnetic cores made of soft magnetic materials are mainly used in the manufacture of electronic transformers, inductors and filters. Among them, the MnZn power ferrite material has high saturation magnetic induction (Bs), high initial permeability (μ i ) and low loss (P L ) and other advantages, are widely used in switching power supply transformers. At present, the switching power supply is developing in the direction of high frequency, miniaturization and high efficiency, and with the gradual increase of the application frequency of the switching power supply, the loss of transformers, inductors, etc. is increasing, especially when the frequency reaches MHz, the loss is even more sharp Increase, heat generation increases, which hinders the d...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/626H01F1/37H01F41/02
CPCC04B35/2658C04B35/622C04B35/62605C04B35/62645C04B2235/3208C04B2235/3232C04B2235/3239C04B2235/3275C04B2235/3293C04B2235/6567C04B2235/6583C04B2235/77C04B2235/96C04B2235/9607H01F1/37H01F41/0246
Inventor 余忠胡鑫孙科郭荣迪蒋晓娜兰中文吴国华
Owner 江西尚朋电子科技有限公司
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