CN104064309A - Magnetic material for high-power LED and LLC converters as well as preparation method of magnetic material - Google Patents

Magnetic material for high-power LED and LLC converters as well as preparation method of magnetic material Download PDF

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Publication number
CN104064309A
CN104064309A CN201310095653.8A CN201310095653A CN104064309A CN 104064309 A CN104064309 A CN 104064309A CN 201310095653 A CN201310095653 A CN 201310095653A CN 104064309 A CN104064309 A CN 104064309A
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preparation
magnetic material
mixture
particle
impurity
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杨胜麒
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SHANGHAI MEIXING ELECTRON CO Ltd
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SHANGHAI MEIXING ELECTRON CO Ltd
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Abstract

The invention discloses a magnetic material for high-power LED and LLC converters. The magnetic material takes three materials, namely, Fe2O3, MnO and ZnO, as main raw materials and is appropriately doped with impurities; the mole ratio of three metal ions, namely, Fe3+, Mn2+ and Zn2+, of the main raw materials is (12.03-12.04):(9.92-9.93):1; the doped impurities account for 0.12-0.21% of the total mass; the impurities are one or more of CaCO3, TiO2, MoO3, Co2O3, SiO2, Bi2O3, CuO, Nb2O5 and SnO2. The invention further discloses a preparation method of the magnetic material. The saturation flux density (Bs) of the magnetic material is improved, and the DC biasing characteristic of the converters is optimized.

Description

Be used for magnetic material of great power LED and LLC converter and preparation method thereof
Technical field
The present invention relates to a kind of magnetic material and preparation method thereof, be specifically related to a kind of magnetic material for great power LED and LLC converter and preparation method thereof.
Background technology
Great power LED and LLC refer to that power output is greater than LED and the LLC of 200W.
For the permeability of power inverter, be generally at present the low-power consumption magnetic material of 2300 left and right, at saturation induction density (Bs) and the core loss of 100 ℃ of high temperature, be respectively 390mT and 410KW/m 3.
Although this also can meet some conventional converter requirements, but the desired efficiency of LED converter is very high, power is also larger, therefore to the saturation flux induction (Bs) of magnetic core and core loss (Pcv), require very harsh, core loss that not only will be lower, but also need higher saturation induction density (Bs).
Therefore a kind of applicable great power LED and LLC converter magnetic material used are invented in active demand.
Summary of the invention
The object of the invention is to, a kind of magnetic material for great power LED and LLC converter and preparation method thereof is provided, to overcome the existing above-mentioned shortcoming and defect of prior art.The present invention guarantees the low-loss requirement of material from formula, flouring technology, the sintering process of magnetic material, has also improved the saturation induction density (Bs) of magnetic material simultaneously, has optimized the direct current biasing characteristic of converter.
The technical problem that will solve required for the present invention, can be achieved through the following technical solutions:
As a first aspect of the present invention, a kind of magnetic material for great power LED and LLC converter, is characterized in that, with Fe 2o 3, MnO, tri-kinds of materials of ZnO be primary raw material, and mixes in right amount impurity,
Wherein, the mol ratio of three metal ion species of primary raw material is: Fe 3+: Mn 2+: Zn 2+=12.03～12.04:9.92～9.93:1;
Wherein, to account for gross mass percentage be 0.12～0.21% to impurity doping.
Further, described impurity is CaCO 3, TiO 2, MoO 3, Co 2o 3, SiO 2, Bi 2o 3, CuO, Nb 2o 5, SnO 2any one or combination.
In order to guarantee low core loss and high saturation flux induction, this is decided by Fe to a certain extent 2o 3with the ratio of MnO, through the checking of orthogonal experiment, material basic recipe Fe 2o 3: MnO:ZnO=55:41:4.
For obtaining desirable electromagnetic performance, also must add modification impurity.According to parameters such as the fusing point of various impurity, ionic radius, from CaCO 3, TiO 2, MoO 3, Co 2o 3, SiO 2, Bi 2o 3, CuO, Nb 2o 5, SnO 2in impurity, optimized a kind of impurity combination, to improving the electromagnetic performance of material, played very important effect.
As a second aspect of the present invention, a kind of preparation method of the magnetic material for great power LED and LLC converter, is characterized in that, comprises the following steps:
The preparation of step 1, the first mixture: by Fe 2o 3: tri-kinds of raw materials of MnO:ZnO are according to Fe 3+: Mn 2+: Zn 2+mol ratio is that the ratio of 12.03～12.04:9.92～9.93:1 is mixed into the first mixture;
Step 2, powder process for the first time: after gained the first mixture is pulverized, ground, mixes, carry out 850～950 ℃ of pre-burnings;
The preparation of step 3, the second mixture: mix impurity, add that to account for gross mass percentage be 0.12～0.21% CaCO 3, TiO 2, MoO 3, Co 2o 3, SiO 2, Bi 2o 3, CuO, Nb 2o 5, SnO 2any one or combination, as impurity, are made the second mixture;
Step 4, powder process for the second time: after gained the second mixture is pulverized, ground, mixes, carry out that spray-on process is dry, granulation;
Step 5, moulding: particle is pressed into magnetic core blank;
Step 6, sintering: by blank, at 1300 ℃～1350 ℃ sintering, insulation is more than 6 hours.
In step 2 and step 4, in pulverizing process, emphasis guarantee to weigh accurately, batch mixing all even granulation size one.
In step 2, calcined temperature is controlled at 900～950 ℃.
In step 4, grind for the second time steel ball size used and select Φ 3.0, make final particulate material tiny, even.
In step 4, spray-on process is dry, the particle water content of preparation is 0.3～0.4%, grain diameter is 200～300 μ m.
Further, described grain diameter is preferably 230～280 μ m, and the particle in this particle size range is no less than 80% of total particle quantity.
Further, the apparent density of described particle is 1.25～1.30g/cm 3.
In step 5, obtaining low porosity blank is to obtain one of high performance prerequisite, and in forming process, the pressure of moulding is directly connected to the quality of blank quality.Inventor is in conjunction with the characteristic (as mobility, particle size distribution) of particulate material and suppress different blanks and carry out the adjusting of briquetting pressure, and as when the step 5 compacting magnetic core blank, the pressure of described moulding is 15t/cm 2.
Further, add zinc stearate, the porosity of magnetic core blank is 1.2%.
In step 6, described sintering is sintering in clock hood type furnace.
Sintering process is marginal to ferritic performance tool, has influence on the degree of solid phase reaction and last phase composition, density, grain size etc.For enhancing productivity, general FERRITE CORE sintering is all to use nitrogen protection tunnel cave, for this kind of material, for guaranteeing the consistency of magnetic core sintering, reduces magnetic core internal stress.Inventor ties with the klining of clock hood type furnace place of nitrogen protecting tunnel, and sintering temperature is controlled at 1320 ℃ of left and right simultaneously, and insulation is more than 6 hours.
Beneficial effect of the present invention:
1, the initial permeability of magnetic material of the present invention reaches 2500 ± 25%, and like product is 2300 ± 30%.
2, the residual magnetic flux density of magnetic material of the present invention (Br) is 60mT, and like product is 55mT.
3, magnetic material of the present invention is 410mT in high temperature (100 ℃) saturation induction densities (Bs), and like product is 390mT.
4, the core loss of magnetic material of the present invention is at 100 ℃, 100kHz, 200mT test condition 250KW/m 3, like product is 410KW/m 3.
5, Curie temperature is greater than 220 ℃.
Accompanying drawing explanation
Fig. 1 is saturation induction density-temperature profile of the present invention.
Fig. 2 is the magnetic permeability-temperature profile under 1khz of the present invention.
Fig. 3 is magnetic permeability-μ of 25 ℃ of the present invention ithe curve chart of frequency.
Fig. 4 is magnetic flux density-Magnetic field strength curve figure of the present invention.
Fig. 5 is power consumption-temperature profile of the present invention.
Fig. 6 is the present invention's power consumption-magnetic flux density curve chart at 100 ℃.
Fig. 7 is the present invention's power consumption-magnetic flux density curve chart at 120 ℃.
Embodiment
Below in conjunction with specific embodiment, the present invention is done to progressive explanation.Should be understood that following examples are only for the present invention is described but not for limiting scope of the present invention.
Embodiment
As shown in Fig. 1～Fig. 7, a kind of magnetic material for great power LED and LLC converter and preparation method thereof, comprising:
The preparation of step 1, the first mixture: by Fe 2o 3: tri-kinds of raw materials of MnO:ZnO are according to Fe 3+: Mn 2+: Zn 2+mol ratio is that the ratio of 12.03～12.04:9.92～9.93:1 is mixed into the first mixture.
According to primary raw material formula, according to molar percentage, be:
Fe 2O 3：MnO：ZnO＝55mol%：41mol%：4mol%。
Step 2, powder process for the first time: after gained the first mixture is pulverized, ground, mixes, carry out 900 ℃ of pre-burnings.In pulverizing process, emphasis guarantee to weigh accurately, batch mixing all even granulation size one.
The preparation of step 3, the second mixture: mix impurity, add that to account for gross mass percentage be 0.12～0.21% CaCO 3, TiO 2, MoO 3, Co 2o 3, SiO 2, Bi 2o 3, CuO, Nb 2o 5, SnO 2any one or combination, as impurity, are made the second mixture;
Step 4, powder process for the second time: after gained the second mixture is pulverized, ground, mixes, carry out that spray-on process is dry, granulation; In pulverizing process, emphasis guarantee to weigh accurately, batch mixing all even granulation size one.
Grind for the second time steel ball size used and select Φ 3.0, make final particulate material tiny, even.
In step 4, spray-on process is dry, the particle water content of preparation is 0.3～0.4%, grain diameter is 200～300 μ m.In the present embodiment, be normal distribution, 80% the grain diameter that the particle in this particle size range is no less than total particle quantity is preferably 230～280 μ m.The apparent density of particle is 1.25g/cm 3.
Step 5, moulding: particle is pressed into magnetic core blank.The pressure of moulding is 15t/cm 2, and adding 0.05% zinc stearate, the porosity of magnetic core blank only has 1.2%.
Step 6, sintering: by blank 1300 ℃～1350 ℃ sintering in clock hood type furnace, insulation is more than 6 hours.
The performance of magnetic material of the present invention.Fig. 1 is saturation induction density-temperature profile of the present invention.As shown in Figure 1, at magnetic field intensity H, be 1194(A/m) time, Curie temperature is greater than 220 ℃.
The residual magnetic flux density of magnetic material of the present invention (Br) is 60mT, and like product is 55mT.
Magnetic material of the present invention is 410mT in high temperature (100 ℃) saturation induction densities (Bs), and like product is 390mT.
Fig. 2 is the magnetic permeability-temperature profile under 1khz of the present invention.As shown in Figure 2, initial permeability reaches 2500 ± 25%, and like product is 2300 ± 30%.
Fig. 3 is magnetic permeability-μ of 25 ℃ of the present invention ithe curve chart of frequency.
Fig. 4 is magnetic induction density B of the present invention (mT)-magnetic field intensity H(A/m) curve chart.
Fig. 5 is power consumption-temperature profile of the present invention.As shown in Figure 5, the core loss of magnetic material of the present invention is at 100 ℃, 100kHz, 200mT test condition 250KW/m 3, like product is 410KW/m 3.
Fig. 6 is the present invention's power consumption-magnetic flux density curve chart at 100 ℃.Fig. 7 is the present invention's power consumption-magnetic flux density curve chart at 120 ℃.
Above the specific embodiment of the present invention is illustrated, but the present invention is as limit, only otherwise depart from aim of the present invention, the present invention can also have various variations.

Claims (10)

1. for a magnetic material for great power LED and LLC converter, it is characterized in that, with Fe 2o 3, MnO, tri-kinds of materials of ZnO be primary raw material, and mixes in right amount impurity,
Wherein, the mol ratio of three metal ion species of primary raw material is: Fe 3+: Mn 2+: Zn 2+=12.03～12.04:9.92～9.93:1;
Wherein, to account for gross mass percentage be 0.12～0.21% to impurity doping.
2. magnetic material according to claim 1, is characterized in that: described impurity is CaCO 3, TiO 2, MoO 3, Co 2o 3, SiO 2, Bi 2o 3, CuO, Nb 2o 5, SnO 2any one or combination.
3. a preparation method for the magnetic material for great power LED and LLC converter as claimed in claim 1, is characterized in that, comprises the following steps:
The preparation of step 1, the first mixture: by Fe 2o 3: tri-kinds of raw materials of MnO:ZnO are according to Fe 3+: Mn 2+: Zn 2+mol ratio is that the ratio of 12.03～12.04:9.92～9.93:1 is mixed into the first mixture;
Step 2, powder process for the first time: after gained the first mixture is pulverized, ground, mixes, carry out 850～950 ℃ of pre-burnings;
The preparation of step 3, the second mixture: mix impurity, add that to account for gross mass percentage be 0.12～0.21% CaCO 3, TiO 2, MoO 3, Co 2o 3, SiO 2, Bi 2o 3, CuO, Nb 2o 5, SnO 2any one or combination, as impurity, are made the second mixture;
Step 4, powder process for the second time: after gained the second mixture is pulverized, ground, mixes, carry out that spray-on process is dry, granulation;
Step 5, moulding: particle is pressed into magnetic core blank;
Step 6, sintering: by blank, at 1300 ℃～1350 ℃ sintering, insulation is more than 6 hours.
4. preparation method according to claim 3, is characterized in that: in step 4, grind for the second time steel ball size used and select Φ 3.0, make final particulate material tiny, even.
5. preparation method according to claim 3, is characterized in that: in step 4, spray-on process is dry, the particle water content of preparation is 0.3～0.4%, grain diameter is 200～300 μ m.
6. preparation method according to claim 5, is characterized in that: described grain diameter is 230～280 μ m, and the particle in this particle size range is no less than 80% of total particle quantity.
7. preparation method according to claim 6, is characterized in that: further, the apparent density of described particle is 1.25～1.30g/cm 3.
8. preparation method according to claim 3, is characterized in that: in step 5, during compacting magnetic core blank, the pressure of described moulding is 15t/cm 2.
9. preparation method according to claim 8, is characterized in that: further, add zinc stearate, the porosity of magnetic core blank is 1.2%.
10. preparation method according to claim 3, is characterized in that: in step 6, described sintering is sintering in clock hood type furnace.
CN201310095653.8A 2013-03-22 2013-03-22 Magnetic material for high-power LED and LLC converters as well as preparation method of magnetic material Pending CN104064309A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040130429A1 (en) * 2002-12-20 2004-07-08 Tdk Corporation Mn-Zn based ferrite, magnetic core for transformer and transformer
CN1692089A (en) * 2003-01-10 2005-11-02 Tdk株式会社 Ferrite material and method of manufacturing the same
CN102503397A (en) * 2011-11-29 2012-06-20 无锡斯贝尔磁性材料有限公司 Manganese oxide doped manganese-zinc ferrite and preparation method thereof
CN102690112A (en) * 2012-05-25 2012-09-26 南通华兴磁性材料有限公司 MnZn ferrite material for broadband anti -electromagnetic-interference and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040130429A1 (en) * 2002-12-20 2004-07-08 Tdk Corporation Mn-Zn based ferrite, magnetic core for transformer and transformer
CN1692089A (en) * 2003-01-10 2005-11-02 Tdk株式会社 Ferrite material and method of manufacturing the same
CN102503397A (en) * 2011-11-29 2012-06-20 无锡斯贝尔磁性材料有限公司 Manganese oxide doped manganese-zinc ferrite and preparation method thereof
CN102690112A (en) * 2012-05-25 2012-09-26 南通华兴磁性材料有限公司 MnZn ferrite material for broadband anti -electromagnetic-interference and preparation method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
李纲等: "最新代高Bs低功耗MnZn铁氧体材料的制备", 《上海大学学报》 *
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Application publication date: 20140924