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本帖最后由 Safer 于 2014-2-7 18:00 编辑 6 x' e' Z& Z+ g6 Q$ x% e' e
jjlamshushushu 发表于 2014-1-25 11:15
9 B6 Q8 T0 X- C4 ?. R _关键是要满足UL1097/2097的DOUBLE INSULATION 比较困难啊 ( _+ ~' f- z5 O ?8 s6 f
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根据UL 2097 附录A(电气设备中双重绝缘的实施指导)% A; ^* a4 D) [: S: k
% C4 K# ^9 ~: S4 r9 QIn general, double-insulated and reinforced-insulated equipment may be considered to provide an
% n: z! I# N+ f$ x- M ?alternative method to obtain the same level of protection from the risk of electric shock as grounded2 O- |9 r: K: I9 ~; n0 k
equipment with the equipment grounding conductor intact.
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满足加强绝缘可以视为等效满足Double insulation./ C% S, L0 O9 v* e E6 L! w
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R和D绝缘耐压测试电压也是相同的(2*终端产品标准列明值) A% k# T2 M J7 Z
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满足以下即可满足UL 2097的要求:
3 A2 M7 V: d% N! X- L1 u3 T1)漏电流满足要求:满足终端标准/0.5、0.7 MIU;
4 @( u4 J0 Z6 w t# e; w2 U2)耐压满足要求:2*终端产品标准列明值;
7 [( ]9 ^; l) F. [6 W9 z& }3)变压器过载满足要求;
7 I4 u, y. Q( t$ V) O4)初次级线圈满足距离要求:2*终端产品标准列明(B)值;
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结论: m4 ?+ s1 t/ A% k8 A
1)满足以上4条,就可以满足UL 2097;" o. L6 {+ g* N s$ l
2)如图所示的结构,不满足UL 1838 C22.3.2 a)的要求;- c9 T; v3 U+ _0 t$ ?
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