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Forum 过滤电子噪音
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过滤电子噪音

糖葫芦mm
糖葫芦mm over 14 years ago

现在电路中有很多电机工作,我的一个信号发生器也接在这个电路里,但是电机的启动会影响信号发生器的工作,谁有什么解决办法么?

 

我听说隔离变压器可以改善,但是问了一些变压器厂的人,他们说解决不了,稳压电源也不行,这可咋办啊?

 

我咨询了一下,看样子现在可能性最大的是谐波干扰。电路里有一个变频电机,这个电机负载增加一点我的信号发生器就没法用了。
关键是什么叫“电源相互独立”?从不同照明电变压器出来?还是不同接线板就行?

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  • 呵呵我
    呵呵我 over 14 years ago

    抑制谐波干扰常用的方法

      谐波的传播途径是传导和辐射,解决传导干扰主要是在电路中把传导的高频电流滤掉或者隔离;解决辐射干扰就是对辐射源或被干扰的线路进行屏蔽。具体常用方法:(1)变频系统的供电电源与其他设备的供电电源相互独立,或在变频器和其他用电设备的输入侧安装隔离变压器,切断谐波电流。(2)在变频器输入侧与输出侧串接合适的电抗器,或安装谐波滤波器,滤波器的组成必须是LC型,吸收谐波和增大电源或负载的阻抗,达到抑制谐波的目的。(3)电动机和变频器之间电缆应穿钢管敷设或用铠装电缆,并与其他弱电信号在不同的电缆沟分别敷设,避免辐射干扰。(4)信号线采用屏蔽线,且布线时与变频器主回路控制线错开一定距离(至少20cm以上),切断辐射干扰。(5)变频器使用专用接地线,且用粗短线接地,邻近其他电器设备的地线必须与变频器配线分开,使用短线。这样能有效抑制电流谐波对邻近设备的辐射干扰。

    http://blog.china.alibaba.com/blog/cxz0577/article/b0-i1161101.html

    电源相互独立:用不同的电源供电。然后这些电源共同接地。共同接地的时候最好也要处理一下,比如串接个电感。
    参考资料:http://blog.china.alibaba.com/blog/cxz0577/article/b0-i1161101.html

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