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引用第3楼someone于2009-06-03 16:02发表的 :# ?' G0 p# U$ C0 p# T, [
未必是所有的家电用开关电源内的隔离电容都需要两个Y电容串联。
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按照60335-1的22.42条的要求:
% W" a- Q( {9 f( l7 Q22.42 Protective impedance shall consist of at least two separate components whose
9 q7 W2 l5 ~0 X Nimpedance is unlikely to change significantly during the lifetime of the appliance. If any one of8 |$ ?$ _+ r/ }: ?. p! {* v9 c5 F
....... 请先弄清protective impedance的含义。3 w/ V" S6 V# o9 @3 @
根据定义,有protective impedance的电路应是accessible的。 |
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