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本帖最后由 Safer 于 2014-2-7 18:00 编辑 . L3 }' }/ i$ l% w) r' I
jjlamshushushu 发表于 2014-1-25 11:15
( k, D* C! F+ d: A/ l; h关键是要满足UL1097/2097的DOUBLE INSULATION 比较困难啊
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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)
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) w2 s7 v! i0 M2 |# o) M4 KIn general, double-insulated and reinforced-insulated equipment may be considered to provide an1 q" Y9 p. V3 ]& g, i
alternative method to obtain the same level of protection from the risk of electric shock as grounded; U% P: B+ B& F2 v E- z; {
equipment with the equipment grounding conductor intact.
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0 N! f, R9 ]% P# r8 ]9 F$ }/ z满足加强绝缘可以视为等效满足Double insulation.! h8 s# }" l' \, A$ ?
8 Y# p% P* s& w9 N0 vR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)' @& M3 C. H: L/ C" T d0 j
9 @( y! `4 ?5 K4 k! k满足以下即可满足UL 2097的要求:
6 F; N# u7 z& F" T9 F' m6 ? S1)漏电流满足要求:满足终端标准/0.5、0.7 MIU;* P2 g: X8 n% n/ n
2)耐压满足要求:2*终端产品标准列明值;
+ Q" R: X; w7 G, r- g' h( }3)变压器过载满足要求;* k4 [) J' X/ m
4)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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" s% Q0 a$ S8 q6 o+ l" ]结论:1 q3 M, S1 M/ ?# Z+ M, n! n
1)满足以上4条,就可以满足UL 2097;
/ }5 ^6 ]4 v& Q1 J$ g1 O2)如图所示的结构,不满足UL 1838 C22.3.2 a)的要求;
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