|
|
60950的2.1.1.7写到:
- a9 ~6 Q1 U1 i' s/ i) P
- ]2 V# e4 h; d" f1 bNo test for shock hazard is required unless the nominal voltage of the MAINS SUPPLY exceeds 42,4 V peak or 60 V d.c.: i" W1 k I* w$ a; V
就是输入超过SELV的就要去考虑电容放电,这是条件一;
- F; k0 ~1 X8 n2 J4 H7 g
. R: {) h0 ?+ f4 ~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;% u, g F. y% A7 n& m, E0 G4 s
NOTE During an interval equal to one time constant, the voltage will have decayed to 37 % of its original value.; F. z4 ?3 Z" o. j
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;( k* i5 D) B4 D ?, C# q2 ]
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。 |
|