Magnetic material for photovoltaic inverter

Abstract

The invention discloses a magnetic material for a photovoltaic inverter. The magnetic material is characterized by being a MnZn ferrite material and comprising 51.5 to 57.5 molar percent of Fe2O3, 4.5 to 15.5 molar percent of ZnO and the balance of MnO which serve as main components and 0.05 to 0.15 weight percent of Eu2O3 and 0.008 to 0.10 weight percent of Al2O3 which serve as auxiliary components, and one or more of 0 to 0.15 weight percent of CaO, 0 to 0.035 weight percent of SiO2, 0 to 0.50 weight percent of MgO, 0 to 0.06 weight percent of Nb2O5 and 0 to 0.055 weight percent of ZrO2 which also serve as auxiliary components. The magnetic material is characterized in that: the thermal expansion coefficient is less than 8*10<-6>; the magnetostrictive coefficient is less than -0.3*10<-6>; the magnetic conductivity at the temperature of 25 DEG C is 2,100+ / -25 percent; the saturation magnetic flux density at the temperature of 25 DEG C is more than 530mT and the saturation magnetic flux density at the temperature of 100 DEG C is more than 430mT; and at the temperature of 100 DEG C, under the conditions of 25KHz*200mT and 100KHz*200mT, the energy consumption is less than 65mW / cm<3>and 320mW / cm<3> respectively.

Description

technical field [0001] The invention relates to a magnetic material for a photovoltaic inverter and a preparation method thereof. Background technique [0002] In recent years, with the enhancement of people's awareness of environmental protection, more and more attention has been paid to renewable energy. Among various renewable energy sources such as solar energy, wind energy, and tidal energy, solar energy has become the first choice for people. The solar photovoltaic power generation system is composed of solar panels, charge controllers, inverters and batteries. In the solar photovoltaic power generation system, the photovoltaic inverter is the key component of the entire solar energy system and the core of the photovoltaic system. Solar energy is converted to generate electrical energy through battery panels. However, the power converted by the battery panel is direct current. To truly become the alternating current that can be used in most occasions, a special equip...

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Problems solved by technology

[0009] The above-mentioned patents are mainly to reduce the power consumption of switching power supply transformers or MnZn ferrite materials for choke coils and increase their saturation magnetic flux density, but basically do not consider how to reduce the thermal expansion coefficient and magnetostriction coefficient of the magnetic core. This is because General electronic circuit transformers are usually small in size and low in conversion power, usually between a few watts and several hundred watts. Therefore, general electronic circuit transformers usually do not consider the thermal expansion coefficient and magnetostriction coefficient of the MnZn ferrite material core.

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