|
|
60950的2.1.1.7写到:
) X5 Q, `' Q4 E/ S4 L
8 \) o9 i% }7 b; v( pNo test for shock hazard is required unless the nominal voltage of the MAINS SUPPLY exceeds 42,4 V peak or 60 V d.c.5 w7 V3 M2 y, o2 ~
就是输入超过SELV的就要去考虑电容放电,这是条件一;
* v) F) s# k, U0 b, ~* Y( P+ R5 D0 Z) p+ U# b9 P
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;
+ n) a7 L' X7 A2 x- e+ LNOTE During an interval equal to one time constant, the voltage will have decayed to 37 % of its original value.1 i- b& d, k! R, |/ O& A
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;& |/ F( \) a v7 K4 o
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。 |
|