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引用第3楼someone于2009-06-03 16:02发表的 :& e, S' _7 ?$ C. c
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。2 s( T+ e" k( S& @+ }
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按照60335-1的22.42条的要求:; v9 N! r; l# T! f
22.42 Protective impedance shall consist of at least two separate components whose" I( Y8 K B" c1 J7 g/ c$ R, W) y
impedance is unlikely to change significantly during the lifetime of the appliance. If any one of
$ k8 v9 @ H, J7 r1 ~1 c....... 请先弄清protective impedance的含义。) L( f6 S# e) i8 C1 N( ^' k, x
根据定义,有protective impedance的电路应是accessible的。 |
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