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引用第3楼someone于2009-06-03 16:02发表的 :
! s: V1 E/ a* U9 I( h% H7 ~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。
E& R. j; H# o( o! E+ S1 [% {0 |7 R$ O( c0 D3 ^5 a: \, F
按照60335-1的22.42条的要求:
" L# u% A, Q* \( X22.42 Protective impedance shall consist of at least two separate components whose5 K; v1 K* H3 H7 `. T
impedance is unlikely to change significantly during the lifetime of the appliance. If any one of
^) c- F3 i/ o% V- C) G....... 请先弄清protective impedance的含义。0 p' f$ J" J; v
根据定义,有protective impedance的电路应是accessible的。 |
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