Dual-Redundant: A fully redundant power system
topology (see Figure 11). The circuit consists of
two complete power supplies connected in parallel.
Power supply #1 runs “hot”, supplying all the
load current, while power supply #2 runs “cool”
(disconnected from the load via oring diodes). If
the “hot” supply fails, the oring diodes reverse
bias and power supply #2 starts to provide full load
current. Dual redundant systems are expensive
and not as flexible in comparison to some other
redundant approaches, but they do allow separate
input power sources to be used. Sometimes
referred to as a “100% redundant” system. See
Master/Slave and N+1.