Wide-temperature-range low-loss Mn-Zn ferrite specially used for solar energy inverter, and preparation method thereof

A manganese-zinc ferrite and inverter technology, which is applied in the field of manganese-zinc ferrite and its preparation, can solve the problems of inability to take into account photovoltaic arrays, low utilization rate of a single photovoltaic array, and poor anti-local shadowing ability of the system, achieving The effects of fine and uniform microscopic grains, low pre-sintering and sintering temperatures, and high-temperature saturation magnetization

Active Publication Date: 2012-03-28
海宁瑞思科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of maximum power point tracking (MPPT) technology in micro-inverters solves the problem that in centralized, string and multi-string systems, MPPT technology cannot take into account each photovoltaic array in the system, and a single photovoltaic Low utilization rate of the array and poor anti-partial shadowing ability of the system

Method used

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  • Wide-temperature-range low-loss Mn-Zn ferrite specially used for solar energy inverter, and preparation method thereof
  • Wide-temperature-range low-loss Mn-Zn ferrite specially used for solar energy inverter, and preparation method thereof
  • Wide-temperature-range low-loss Mn-Zn ferrite specially used for solar energy inverter, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 53.7mol% Fe 2 o 3 , 36.5 mol% Mn 3 o 4 and 9.8 mol% ZnO. After mixing the above main components, add them to a sand mill and mix them for 30 minutes. After spray drying, send them to the rotary kiln for pre-calcination at 900°C±10°C for 45 minutes. Then add auxiliary components to the calcined material and put them into a sand mill for crushing. The crushing time is 120 minutes. After crushing, the particle size of the slurry is controlled at 1.0-1.5 μm; The content of material (wt%) is respectively: CaCO 3 : 0.03, Nb 2 o 5 : 0.005, V 2 o 5 : 0.02, Co 2 o 3 : 0.10. In the process of mixing sand milling and crushing sand milling, it is necessary to add pure water equivalent to 35 wt % of the total amount of main components, as well as some dispersants and defoamers (subject to the set particle size range). Finally, 1.5% of PVA equivalent to the weight of the slurry is added to the sanding slurry, and then the manganese zinc ferrite particles are obtaine...

Embodiment 2~6

[0037] As shown in Table 1, except Fe as the main component 2 o 3 The composition ranges from 53.5mol% to 54.5mol% and the composition of ZnO varies from 8.0mol% to 10.0mol%, and the rest is trimanganese tetraoxide. The rest of the process is carried out in the same manner as in Example 1. After the above-mentioned main components are mixed, they are mixed in a sand mill and mixed for 30 minutes. After being sprayed and dried, they are sent to a rotary kiln and pre-fired at a temperature of 900°C ± 10°C. 45 minutes. Then add auxiliary components to the calcined material and put them into a sand mill for crushing. The crushing time is 120 minutes. After crushing, the particle size of the slurry is controlled at 1.0-1.5 μm; The content of material (wt%) is respectively: CaCO 3 : 0.03, Nb 2 o 5 : 0.005, V 2 o 5 : 0.02, Co 2 o 3 : 0.10. In the process of mixing sand milling and crushing sand milling, it is necessary to add pure water equivalent to 35wt% of the total amou...

Embodiment 7~8

[0057] As shown in Table 2, Fe as the main component 2 o 3 , ZnO, Mn 3 o 4 Content is all identical with embodiment 1, changes the content of the subcomponent cobalt oxide as additive, to its normal temperature initial magnetic permeability μ i , Power loss P at 25°C and 100°C under the conditions of 500kHz, 50mT and 300kHz, 100mT cv characteristics, power loss P cv The lowest point temperature was studied.

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Abstract

The invention relates to wide-temperature-range low-loss Mn-Zn ferrite specially used for a solar energy inverter, and a preparation method thereof. The Mn-Zn ferrite comprises main components of: 53.5mol%-54.5mol% of iron oxide calculated according to Fe2O3, 8.0mol%-10.0mol% of zinc oxide calculated according to ZnO, and balance of mangano-manganic oxide. The Mn-Zn ferrite also comprises minor components of, by weight: 0.03-0.04% of CaCO3, 0.005-0.01% of Nb2O5, 0.01-0.03% of V2O5, and 0.03-0.2% of Co2O3, calculated according to standard substances of CaCO3, Nb2O5, V2O5, and Co2O3. The Mn-Zn ferrite is prepared with an oxide method, and is sintered under an elevator furnace densification condition. The obtained product has relatively high initial magnetic permeability mui, and low power loss Pcv. With the Mn-Zn ferrite, the loss under a high-frequency transformer operation status is reduced, and the efficiency of the transformer is improved. With the Mn-Zn ferrite, miniature inverterscan be produced with high frequency, small size, and intelligence. Also, a requirement of efficiency improving under a condition of illumination variation can be satisfied. The product is advantaged in high reliability and good stability. With the product, a miniature inverter can be used in environments with large temperature variations, such as deserts and islands.

Description

technical field [0001] The invention belongs to the technical field of low-power manganese-zinc soft magnetic ferrite, and in particular relates to a manganese-zinc ferrite specially used for solar micro-inverters with low sintering temperature, wide temperature range and low power loss and a preparation method thereof. Background technique [0002] Solar energy resources are clean, pollution-free, renewable, green and environmentally friendly, and are receiving more and more attention in the field of new energy. Governments of various countries have introduced policies to support its development. With the development and progress of solar power generation technology, the grid-connected inverter also develops and progresses accordingly. [0003] Generally, the conversion efficiency of solar cells is only about 10-20%. High-efficiency and cost-effective inverters have become a key indicator for evaluating the quality of solar power generation systems. Taking a 20kWp install...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 邢冰冰顾张新聂敏孙蒋平申志刚
Owner 海宁瑞思科技有限公司
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