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60950的2.1.1.7写到:
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\) N9 e# l) R" UNo 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 _, {6 H9 g. X; B( V
就是输入超过SELV的就要去考虑电容放电,这是条件一;
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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;/ l* ]* \8 K4 m: A# `5 I' C b
NOTE During an interval equal to one time constant, the voltage will have decayed to 37 % of its original value./ I4 k" g7 |8 k( Q; |! [
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;. B2 Z7 N3 b# [3 F1 I
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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