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60950的2.1.1.7写到:" B) X% f% x" w% M! K
' M( S, b9 S8 O6 n/ l s \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., J4 |( |2 X% Q5 O
就是输入超过SELV的就要去考虑电容放电,这是条件一;) w: L. R' m6 l( }
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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;
# O) H( ~$ m+ d: l. ENOTE During an interval equal to one time constant, the voltage will have decayed to 37 % of its original value.
: M# |. K4 j: c# n1 @8 Z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;- g% T% s" i; e* c; _1 m0 y# B0 F
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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