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60950的2.1.1.7写到:
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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.
6 T5 C- s. p' r7 N& J就是输入超过SELV的就要去考虑电容放电,这是条件一;* d9 i' Q* w+ T4 O( ~9 ]
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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;, T0 {4 J+ B/ g
NOTE During an interval equal to one time constant, the voltage will have decayed to 37 % of its original value.5 E" _+ K0 E8 l$ [, E: x ^# s
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;
* e3 E/ ]3 {; H( y& r9 w3 n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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