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    • 2. 发明授权
    • Common mode choke coil
    • 共模扼流圈
    • US06456182B1
    • 2002-09-24
    • US09518273
    • 2000-03-03
    • Norio KatayamaToshinori Okamoto
    • Norio KatayamaToshinori Okamoto
    • H01F2734
    • H01F27/324H01F3/10H01F3/14H01F17/062H01F27/33H01F27/34
    • In a common mode choke coil, a closed magnetic circuit core (2) is divided in parallel with its magnetic circuit, and formed by superimposing together for integration a first divided magnetic core (2a), a second divided magnetic core (2b) and a third divided magnetic core (2c) which are made of an oxide magnetic substance having the high permeability. Since the closed magnetic circuit core (2) is made of the oxide magnetic substance having the high permeability, the impedance in the low frequency band (10 kHz side) is large. Also, since the sectional area of the closed magnetic circuit core (2) (divided magnetic core) is set to be small, the permeability in the high frequency band (10 MHz side) becomes high due to the dimensional resonance phenomenon, and then the impedance also becomes large. For that reason, the noise in the wide frequency band of 10 kHz to 10 MHz can sufficiently be attenuated.
    • 在共模扼流线圈中,封闭磁路铁心(2)与其磁路并联分开,并通过叠加在一起形成第一分割磁芯(2a),第二分割磁芯(2b)和 第三分割磁芯(2c),其由具有高磁导率的氧化物磁性物质制成。 由于闭磁回路芯(2)由具有高磁导率的氧化物磁性体制成,所以低频带(10kHz侧)的阻抗较大。 此外,由于封闭磁路铁心(2)(分割磁芯)的截面积设定得较小,所以由于尺寸共振现象,高频带(10MHz侧)的磁导率变高, 阻抗也变大。 因此,可以充分地衰减10kHz至10MHz的宽频带中的噪声。