IEC60950-1:2005 AM1已经修改了要求，并不要求两个电容一定是容值相同了：
修改前：
7 If two or more capacitors are used in series, they shall
- all have the same nominal capacitance value;
- each be rated for the total RMS WORKING VOLTAGE across the insulation; and
- comply with the other rules above.
修改后：
7 If two or more capacitors are used in series, all of the following apply:
– under single fault conditions, the voltage on each of the remaining individual capacitors shall not exceed the voltage rating of the relevant individual capacitor;
– for BASIC INSULATION or SUPPLEMENTARY INSULATION, the sum of the peak impulse test voltages of all capacitors shall be not less than the peak value of the test voltage (not the r.m.s. voltage) of Table 5B, or the peak value of the test voltage of Table 5C, as applicable;
– for BASIC INSULATION or SUPPLEMENTARY INSULATION, the sum of the r.m.s. test voltages of all capacitors shall be not less than the required r.m.s. test voltage of Table 5B, or the equivalent r.m.s. test voltage (not the peak voltage) of Table 5C, as applicable;
– for REINFORCED INSULATION, the sum of the peak impulse test voltages of all capacitors shall be not less than the peak value of the test voltage (not the r.m.s. voltage) of Table 5B, or the peak value of the test voltage of Table 5C, as applicable;
– for REINFORCED INSULATION, the sum of the r.m.s. test voltages of all capacitors shall be not less than the required r.m.s. test voltage of Table 5B, or the equivalent r.m.s. test voltage (not the peak voltage) of Table 5C, as applicable;
– they shall comply with the other rules above.
跟踪关注中，对于这个问题也有疑问，对上面的解释心有迷惑，但又说不出，继续关注
的確最新的60950:2009版，已經沒有這樣要求了
安规新人关注中。。。
不符合，标准里面有严格要求。
呵呵，当专家们费尽心思，苦思冥想终于找到解释两个电容容量必须一致的科学理论根据，他娘的，变了，又得苦思冥想去找两个电容容量不必一致的科学理论根据。
山炮 发表于 2012-5-25 12:59 static/image/common/back.gif
同意楼上。
容值不同是不可以串联使用的。
A1不看还不知道
但在950-1中，就说明，可以使用两个Y2串联，替代Y1
但需要相同的电容值
必须使用等值的电容！
