electrolitic
Electrical
It is an old question : some important switchgear designers apply 4 blocking diodes when connecting two control DC power supplies in parallel. Others, 2 just at positive leads. It is well known the risk of serious continuous overvoltage ( 2 times Vnom) at load, under certain fault conditions. Surely there is a reason that justifies the 4 diodes arrangement. Can someone explain it? Thanks.