标题: 在强电的地和弱电的地之间接 [打印本页] 作者: panhaojie 时间: 2008-4-7 13:59 标题: 在强电的地和弱电的地之间接 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？作者: anlishao 时间: 2008-10-7 10:48
数字地和保护地连接的方法有好几种。 2 j4 k4 x7 e! H' U用103/1KV的电容连接，用1M电阻连接，用电容加电阻连接。 6 c7 B. a3 D; g" e a) K& X7 G
我只是看到过，具体为什么也不太清楚。作者: 6940 时间: 2024-9-11 09:01
6666666666666666666666666666作者: 超級狗 时间: 2024-9-13 19:18 Y 電容特性 3 d% b/ X3 S3 ?- O0 o7 s9 w1 q% hThis use of a Y-type capacitor requires that the capacitor have the following qualities: ( k3 Y( Y) K% D( N: r% [) _# L
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. ( B, d" B% W* p" o/ V
B$ [$ U. d; Z+ DThe 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. 4 t/ Y$ y+ y9 l7 n8 Y* Y* U6 z3 J+ B0 O8 x% M 圖示說明 g- z& e' p' X" J0 N/ k4 G
The Y-type capacitor in this circuit (C13) bridges the primary and secondary grounds. ( S, e* L, V" I! D; l$ V 7 G. w4 `- q, l 4 |& N. @9 ^1 F0 x* h! V / m9 D2 v7 r$ i6 \4 c6 U8 G
