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本帖最后由 Safer 于 2014-2-7 18:00 编辑
! l. u7 c) t3 Ajjlamshushushu 发表于 2014-1-25 11:15
M" r3 e6 p# x9 V) E( V% c" A关键是要满足UL1097/2097的DOUBLE INSULATION 比较困难啊 . U% x F0 a" C3 ^" t
. T2 n! X9 y- x7 T0 h4 ^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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* f- W( j" B2 X. a, _In general, double-insulated and reinforced-insulated equipment may be considered to provide an
6 b+ _- V+ x! e2 U' ^5 D2 b! Walternative method to obtain the same level of protection from the risk of electric shock as grounded
l& T1 ]6 R/ x# @) r% Nequipment with the equipment grounding conductor intact.
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, C! E4 S+ g5 K G: [满足加强绝缘可以视为等效满足Double insulation.- k% ^$ S/ y5 R$ n: P2 S7 u
, Z. p6 `" m) YR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)% @- d! \8 O8 P& S. ^
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满足以下即可满足UL 2097的要求:/ y* k9 x( {( j0 N! P$ G
1)漏电流满足要求:满足终端标准/0.5、0.7 MIU;) S# f7 O, I, h# J8 T
2)耐压满足要求:2*终端产品标准列明值; z$ |: h6 U4 w" {( }9 ~
3)变压器过载满足要求;& ] E5 u0 K5 `% J! t
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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* Q# g, F2 s M% ?8 \/ u8 P+ \) c- {结论:3 A1 K; m/ E+ G7 p' |; I% |
1)满足以上4条,就可以满足UL 2097;, ]. Y4 B, b% f4 _% }1 ]& z0 m
2)如图所示的结构,不满足UL 1838 C22.3.2 a)的要求;7 m4 g: Y5 l5 P/ `1 K. d
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