Power supply

A high availability DC power supply (30) with isolated inputs comprises a first diode (36) having a first diode output and a second diode (38) having a second diode output, the diodes receiving isolated inputs from respective power source inputs (42, 50) via respective isolating transformers (44, 52). An output power bus (40) defined by the first diode output coupled to the second diode output is provided. The output power bus is still available to supply power upon the loss of the first isolated direct current power supply (32) or the loss of the second isolated direct current power supply (34).