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60950的2.1.1.7写到:9 v& r1 B ^4 U3 e) v0 b3 W
+ v0 G5 `0 D! `; J6 m% s) s1 L. zNo test for shock hazard is required unless the nominal voltage of the MAINS SUPPLY exceeds 42,4 V peak or 60 V d.c.
; B6 |2 x3 _3 @! j. @$ Y; ~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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; s/ H6 |8 S) ~; @/ O3 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;
6 O4 K/ z" F }. `: L0 NNOTE During an interval equal to one time constant, the voltage will have decayed to 37 % of its original value.' y# q2 T0 i* m; T# g+ ^3 ]1 u
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;6 @, l! |' c5 C
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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