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本帖最后由 Safer 于 2014-2-7 18:00 编辑
# u, M8 |: h1 A8 ~jjlamshushushu 发表于 2014-1-25 11:15 ' y2 h) w: ~, `2 R5 v* B
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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In general, double-insulated and reinforced-insulated equipment may be considered to provide an
+ I( t# h4 L# z8 a: d, e( l" Yalternative method to obtain the same level of protection from the risk of electric shock as grounded
& J4 G" V& {& Y+ Iequipment with the equipment grounding conductor intact.2 B& [. Y# W# L$ T; M. j; h* q
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满足加强绝缘可以视为等效满足Double insulation.6 M+ O+ ^3 M; G& I& A4 l, N
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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)8 _: Y/ M7 F) M) }
% _+ p/ _# O9 W0 w2 h2 x& _3 {满足以下即可满足UL 2097的要求:* u8 {' O" Q- c$ H {$ X
1)漏电流满足要求:满足终端标准/0.5、0.7 MIU;
& L/ X' E: {, t( v/ _# ]" u2)耐压满足要求:2*终端产品标准列明值;4 o Q$ U5 u* V8 i2 }( x$ b
3)变压器过载满足要求;; C- K4 w# D2 p9 |0 }
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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结论:$ t; q& h& k6 f2 x
1)满足以上4条,就可以满足UL 2097;
0 i5 C$ G3 z# M* ~4 j J2)如图所示的结构,不满足UL 1838 C22.3.2 a)的要求;
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