在强电的地和弱电的地之间接

panhaojie

个电容，这个电容有什么要求吗？比如我在220V的中线和3.3V的电源地之间接个电容，有什么要求吗？我看到有电路上接个标识为VA4的黄色电容，它旁边的序号为：CV1那么它的具体值是多少呢？

bazhonglei

要求该电容失效是开路！Y电容！

超級狗

Y 電容特性
& u5 W6 a1 z! IThis use of a Y-type capacitor requires that the capacitor have the following qualities:

• Very high breakdown voltage, so the capacitor case can end up being quite large.
• Larger capacitance value than the winding-to-winding capacitance of the transformer.
  8 r; j( @! K' z* c) e! j  Q0 v

The capacitance value is not always very large, typically being only on the order of nF. The capacitance value represents a trade-off when we start to look at noise control versus safety, the latter of which relates to leakage current.

% p! g3 w2 ~. v( h圖示說明
9 i6 T- _% Q) F* G2 C3 CThe Y-type capacitor in this circuit (C13) bridges the primary and secondary grounds.

) F4 O2 f0 R* y0 U8 s( _! I
5 o1 A- f* j  K4 [" L
) p3 X1 {5 }+ h  Q* j/ Z

6940

6666666666666666666666666666

anlishao

数字地和保护地连接的方法有好几种。
0 H' v) ?& _5 w3 D用103/1KV的电容连接，用1M电阻连接，用电容加电阻连接。

7 l4 `& Z4 x4 @! J9 i. A我只是看到过，具体为什么也不太清楚。