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220伏电整流后为什么两串联滤波电容的250伏的电？

2025-03-16 20:27:15

推荐回答（2个）

回答1：

220V交流电经整流后的波形为峰值220√2=311V的脉动直流，用250V耐压的电容进行滤波，耐压不够。需两只相同容量，耐压250V的电容串联，则耐压为500V，才行。

回答2：

220v的交流电全波整流后，电压是220伏脉动直流，如果后面并联电容，直流电压就变成310伏了，不是250伏，滤波的电容耐压必须在400伏或者450伏，电容越大，电压越稳定的

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