电源滤波选用电感时需要注意哪些事项?
电感元件上电流不能跃变。(电感两端电压撤出后,电流不会立即消失,这样就会产生反动电势)。电感是一种储能元件,用在LC振荡电路、中低频的滤波电路,DC-DC能量转换等等,其应用频率范围很少超过50MHz。
主要参数:
电感值范围:0.1-47uH
直流电阻:有多种直流电阻可供选择,电感值越大,对应的直流电阻也越大。一般信号用电感,其直流电阻比高频信号用电感和电源用电感大一些,最小的直流电阻一般为几毫欧,大的几欧。
自谐振频率:几十兆赫兹到几百兆赫兹。电感值越大,其对应的自谐振频率越小。
额定电流:几毫安到几十毫安。电感值越大,其对应的额定电流越小。
工作频率低于谐振频率时,电感值基本保持稳定:但工作频率超过谐振频率后,电感值将会先增大,达到一定频率后,将迅速减小。
因此,在应用中,应选择谐振频率点高于工作频率的电感为电源滤波选用电感时,需要注意哪几点?
一:电感用于电源滤波时,需要考虑由于其直流电阻而引起的压降。电感的工作电流必须小于额定电流。如果工作电流大于额定电流,电感未必会损坏,但是电感值可能低于标称值。
二:电感与电容组成低通滤波器时,电感值是一个很关键的参数。电感器件资料标称的电感值,是工作频率低于谐振频率点的值,工作频率低于谐振频率时,电感器件表现出电感性,阻抗随着频率的升高而增大:当工作频率高于谐振频率时,电感器件表现出电容性,阻抗随着频率的升高而减小。
三:电感的选用除了考虑所想滤掉的噪声频率外,还要考虑瞬间时电流的反应能力,如果LC的输出端会有机会需要瞬间输出大电流,则电感值太大会阻碍此大电流经过此电感的速度,增加纹波噪声。
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本文由ll转载自杰绅电感(杰绅电子公众号),原文标题为:一文了解-电源滤波选用电感时,需要注意哪些事项?,本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
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杰绅电感分享电感可靠性测试的一些经验内容,希望能够在一定程度上帮到大家。
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可定制车载智能天线频率:20kHz、114.5 kHz、120- kHz、125 kHz、134 kHz、134.2kHz、134.5 kHz;工作温度范围:-40ºC to ~125ºC;电感范围:100~734;符合AEC-Q200(汽车质量标准)和IP68标准;
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可定制共模扼流圈、DIP功率扼流圈、大电流扼流圈、环形扼流圈/线圈等产品,耐温范围-40℃~125℃,电感量最高1200mH。
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