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60950的2.1.1.7写到:) U& g% L* v# F: r/ p
0 a- m6 Z7 g" _# ]3 g" wNo 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 l. L4 k; B) y+ Z; A1 u+ z就是输入超过SELV的就要去考虑电容放电,这是条件一;# k9 _" n3 ?3 ?
7 h6 P! z# g* `% M9 JEquipment 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;, \$ w0 ~3 b: l
NOTE During an interval equal to one time constant, the voltage will have decayed to 37 % of its original value.
* L# p; s" L$ u, |5 k- v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;0 e, J5 }* U1 q& E4 ], U( ~ @
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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