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本帖最后由 Safer 于 2014-2-7 18:00 编辑
1 ]# Q3 O0 C* n5 F9 tjjlamshushushu 发表于 2014-1-25 11:15 & r# W& E# ~. E6 E
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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; }, I M" J# _In general, double-insulated and reinforced-insulated equipment may be considered to provide an8 u$ G: c) Z7 E; j8 z
alternative method to obtain the same level of protection from the risk of electric shock as grounded
7 ]" O6 w. P! {5 kequipment with the equipment grounding conductor intact.* z/ Z6 a" I) J
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满足加强绝缘可以视为等效满足Double insulation.- T! y3 d# o) |2 @, j
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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)7 @9 B" ?+ h1 F( x: S9 c2 ~
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满足以下即可满足UL 2097的要求:
j2 I! ^; n# h9 r$ m- Z1)漏电流满足要求:满足终端标准/0.5、0.7 MIU;
8 ? Y" x2 x* R' f) g% R' @2)耐压满足要求:2*终端产品标准列明值;9 o; R' J# A8 N' E, Z% l. N8 t
3)变压器过载满足要求;
9 J) f. @9 w& V+ Z: F4)初次级线圈满足距离要求:2*终端产品标准列明(B)值;. M. O X' Z. S* M" ~
0 N1 K! c/ _4 A结论:
4 n6 q- ]* u3 |$ D& ^1)满足以上4条,就可以满足UL 2097;
) m# A7 U3 ?9 ?2)如图所示的结构,不满足UL 1838 C22.3.2 a)的要求;
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