IC693ACC309励磁涌流产生的原因是电磁铁的电磁场能量在开关电源变化过程中不能及时消散，产生了瞬态高电压和高电流，导致励磁线圈中电磁场能量的短时间内集中释放，形成暂态过电流，这种过电流称为励磁涌流。具体来说，当电磁铁断开时，磁场中的电能将电磁铁绕组中的电流强行割断，使电磁铁绕组中的电流突然变为零。这样，由于电流突然变化，缓慢降低电流时产生的电势感应在这种情况下是不能消失的，从而在绕组中形成了励磁涌流。
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