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本帖最后由 Safer 于 2014-2-7 18:00 编辑 6 \1 R- }. [0 [3 w3 }* P5 }3 i
jjlamshushushu 发表于 2014-1-25 11:15 9 x& R F& R$ h9 p- |
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)2 ~& _' h; o& W2 E6 _1 O4 t/ o" G
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In general, double-insulated and reinforced-insulated equipment may be considered to provide an" ` z4 k" G( O w
alternative method to obtain the same level of protection from the risk of electric shock as grounded( _; |+ F+ F6 V- e4 n9 ]
equipment with the equipment grounding conductor intact.& P/ p' U; G" y9 {2 @$ ^
5 u6 B" w, R) h* N& c- A满足加强绝缘可以视为等效满足Double insulation.( G1 B7 i+ x& y7 @. \" m
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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)
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+ p: P& ~2 X4 @0 M# k5 k满足以下即可满足UL 2097的要求:- h: g7 E9 u$ W9 h4 e
1)漏电流满足要求:满足终端标准/0.5、0.7 MIU;
" k( i, b) Q5 X4 ~" w/ C2)耐压满足要求:2*终端产品标准列明值;
% @5 J/ l6 Q/ `$ n7 `8 }9 @2 z$ \3)变压器过载满足要求;
1 x" q6 r2 r$ y1 A0 ]* O3 a4)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:
r% f# Z& y& W9 t5 F+ r1)满足以上4条,就可以满足UL 2097;7 J& s# [: Q7 a$ P/ l$ W
2)如图所示的结构,不满足UL 1838 C22.3.2 a)的要求;( s' `" w3 F; }% b+ t$ j3 c
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