|
本帖最后由 Safer 于 2014-2-7 18:00 编辑 5 G/ p; g* v+ e0 k
jjlamshushushu 发表于 2014-1-25 11:15 
6 ]$ {: _, B) V/ b. J关键是要满足UL1097/2097的DOUBLE INSULATION 比较困难啊
1 y+ S8 {1 N% }$ u( P6 P/ z4 _5 Z& V* p
/ N& g+ n, T f根据UL 2097 附录A(电气设备中双重绝缘的实施指导)+ x+ E, g& Y# E* o* h* d
1 w- J) w5 g/ F- e
In general, double-insulated and reinforced-insulated equipment may be considered to provide an( ^8 h8 {: ]: Y
alternative method to obtain the same level of protection from the risk of electric shock as grounded" h5 I/ {8 }& U
equipment with the equipment grounding conductor intact.
7 {5 R2 M5 q" F( P. u' t% `) u1 \ i+ t+ O' d
满足加强绝缘可以视为等效满足Double insulation.6 B$ d6 t2 N9 S
- k; _) y O) B
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)
b+ Y0 I. J0 G! X4 f( L: V
4 e: k5 ` I+ N9 i a8 J满足以下即可满足UL 2097的要求:
: w. [8 u( e R. N& c; D1)漏电流满足要求:满足终端标准/0.5、0.7 MIU;
# ^3 X3 Q) q7 k5 \2 a( G% @2)耐压满足要求:2*终端产品标准列明值;% _! V0 I: o: q2 |4 d. U. I
3)变压器过载满足要求;* R* Y4 d0 B9 R- D5 k' h* j
4)初次级线圈满足距离要求:2*终端产品标准列明(B)值;
# n4 \7 e) M( d$ P2 A) I2 y# J1 j! H! P! Q G( j
结论:
# ]9 `+ C1 i' |4 M% N7 m0 x: b1)满足以上4条,就可以满足UL 2097;
) n* S. x) z! r9 U7 Z8 y' h2)如图所示的结构,不满足UL 1838 C22.3.2 a)的要求;
* Z7 U @1 s' Q7 F. e( `& z% y2 V
, u# J- G2 S7 U6 w! o; x9 L* K* q5 B7 p
|
评分
-
查看全部评分
|