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60950的2.1.1.7写到:
# \$ ^/ c; M U- \# d. K" V9 x+ m7 D
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.
- b1 W) r1 L& X- v% o# @就是输入超过SELV的就要去考虑电容放电,这是条件一;
5 h2 u" C2 X, b4 T* V
) z0 q) g( R1 R% V$ A8 W6 g+ ?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;
) D( |: Y7 N& D9 o( r, t& ]7 a' ?NOTE During an interval equal to one time constant, the voltage will have decayed to 37 % of its original value.
2 D& P3 U) j' z1 e, S5 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;
* H1 u/ [, S7 O& K0 h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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