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本帖最后由 Safer 于 2014-2-7 18:00 编辑
7 u* E( [3 G6 `- C$ t, ^jjlamshushushu 发表于 2014-1-25 11:15
4 W# Z: y: N' h. u; H) L# h% b/ |9 ^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)+ u) E7 ?* R- g) ^& W
; C+ O+ Y- j4 G$ \In general, double-insulated and reinforced-insulated equipment may be considered to provide an* d+ }0 h+ H' q9 @
alternative method to obtain the same level of protection from the risk of electric shock as grounded
. V6 S" {6 u6 {; \equipment with the equipment grounding conductor intact.
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5 y o9 D1 ?2 L2 Z: L: W" I满足加强绝缘可以视为等效满足Double insulation.
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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); n% d" C) m( n/ M7 O& b
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满足以下即可满足UL 2097的要求:
7 U- b9 N* h: w5 B; I2 S1)漏电流满足要求:满足终端标准/0.5、0.7 MIU;8 |" `- i% |& E5 r- X( `1 y
2)耐压满足要求:2*终端产品标准列明值;) V1 R8 C! ^( A; z' K8 t$ R! r7 r8 `
3)变压器过载满足要求;
, q$ ^1 j5 H# v; l0 u4)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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9 K' D4 i& x/ i4 X7 a7 T结论:( T1 ?7 A, W5 `8 S
1)满足以上4条,就可以满足UL 2097;8 C2 O; B( C0 d3 A
2)如图所示的结构,不满足UL 1838 C22.3.2 a)的要求;# n; X' m) j& E9 z& ^
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