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首页> 外文期刊>Industrial Electronics, IEEE Transactions on >Evaluation of High-Current Toroid Power Inductor With NdFeB Magnet for DC–DC Power Converters
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Evaluation of High-Current Toroid Power Inductor With NdFeB Magnet for DC–DC Power Converters

机译：带有NdFeB磁体的DC-DC电源转换器大电流环形功率电感器的评估

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摘要

This paper presents an experimental evaluation of a high-current toroid power inductor (TPI) with a NdFeB permanent magnet (PMTPI). By adding a small piece of a fabricated NdFeB-N35EH magnet (the magnet volume is ∼0.36% of the PMTPI ferrite core volume) in the air gap of the TPI, the saturation current of the PMTPI is doubled with the same size and inductance value. The desired dimensions of the NdFeB-N35EH permanent magnet (PM) are calculated before fabrication, and then, the fabricated PM is characterized. The ∼6.8-μH PMTPI is tested in a 5–2-V buck power converter. Results show that, compared with a TPI with the same size and inductance (∼6.8 μH) without the PM, the saturation current of the PMTPI is doubled (from 7 to 14 A). Compared with another TPI with a larger size needed to double the saturation current, the ferrite core weight of the PMTPI is reduced to 53.6%, and the core volume is reduced to 59.2%. Experimental results also show that the addition of the NdFeB-N35EH PM does not introduce additional power losses and increase of temperature for the PMTPI and does not affect the power converter efficiency.
机译：本文介绍了使用NdFeB永磁体（PMTPI）的高电流环形功率电感器（TPI）的实验评估。通过在TPI的气隙中添加一小块NdFeB-N35EH制成的NdFeB-N35EH磁体（磁体体积约为PMTPI铁氧体磁芯体积的0.36％），在相同尺寸和电感值的情况下，PMTPI的饱和电流将增加一倍。在制造之前计算NdFeB-N35EH永磁体（PM）的所需尺寸，然后对制造的PM进行表征。 〜6.8μHPMTPI在5–2V降压电源转换器中进行了测试。结果表明，与没有PM的相同尺寸和电感（〜6.8μH）的TPI相比，PMTPI的饱和电流增加了一倍（从7 A到14 A）。与另一个需要更大尺寸的TPI来使饱和电流增加一倍相比，PMTPI的铁氧体磁心重量减少到了53.6％，磁心体积减少到了59.2％。实验结果还表明，添加NdFeB-N35EH PM不会引入额外的功率损耗和PMTPI的温度升高，并且不会影响功率转换器的效率。

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