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Power & Energy
Forum 【讨论】RC低通滤波器的设计
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  • 滤波
  • 低通
Related

【讨论】RC低通滤波器的设计

power_biso
power_biso over 14 years ago

如题,好多场合都得用RC低通滤波器滤去高频干扰。怎么选择这二个参数的值呢?请大家讨论。

先提二个问题:

(1)RC低通的截止频率和基波与高频的频率之间成什么关系最好?

(2)RC低通中的R与C是否等价,或者说在截止频率同样的情况下,R大C小与R小C大效果是否一样?

有人说选择RC,使其滞后30°,这时候分析出来是RC时间常数是基波周期的1/11。

1,为什么要选择这个数呢?

2,在基波一样的情况下,譬如说都是50HZ,载波在10K和1K的时候,这个RC怎么选呢?

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  • huayuliang
    0 huayuliang over 14 years ago

    我想你搞糊涂了,这里并不涉及载波。。

    或者说,即便是50Hz的基频,在对载波调制后,频率只能按载波频率计算。

    你需要计算滚降率。一般都以-3dB的频点来作为截止频率。

     

    相移是需要考虑的,但这与其他部分电路的相移综合计算。

     

    电阻、电容的值要根据输入输出阻抗的要求计算。

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