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60950的2.1.1.7写到:/ G4 N# z2 z- @: _6 _
' M0 y! Z3 S- a" _3 [$ A0 A3 B
No test for shock hazard is required unless the nominal voltage of the MAINS SUPPLY exceeds 42,4 V peak or 60 V d.c.3 g# K) G" M7 b: a
就是输入超过SELV的就要去考虑电容放电,这是条件一;& w* j. G c1 i
: e4 x6 l l: f( M: _Equipment is considered to comply if any capacitor having a marked or nominal capacitance exceeding 0,1 uF and in circuits connected to the MAINS SUPPLY has a means of discharge resulting in a time constant not exceeding: 1 s for PLUGGABLE EQUIPMENT TYPE A;
. x, f/ `5 T7 }* x$ pNOTE During an interval equal to one time constant, the voltage will have decayed to 37 % of its original value.
$ S8 w6 R' h% Q* P条件二,如果输入电容(一般看前面跨接L/N的X电容)超过0.1uF的话,针对PLUGGABLE EQUIPMENT TYPE A(非工业插头)产品,它的放电时间常数不能超过1S;
" j5 {# s5 ]' R* r' M" ^7 p这个放电时间常数计算比较复杂,一般情况都是通过测试去判定,1S内plug端的电压(240VrmsX1.4.1=340Vpeak)下降到初始电压的37%(125.8Vpeak)就pass了。 |
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