Patent ID: 8546977

Claim:
A power supply system comprising: a power bus to supply electrical power to a computing system load; a first power supply having a variable first output voltage and a second power supply having a variable second output voltage, wherein the first and second power supplies are coupled to the power bus in a parallel redundant configuration having an ORed output such that the first power supply is an active supply and the second power supply is a quiescent supply when the first output voltage is greater than the second output voltage, and such that the second power supply is the active supply and the first power supply is the quiescent supply when the second output voltage is greater than the first output voltage, wherein the active supply impresses current through the system load and the quiescent supply impresses essentially no current through the system load; and an output voltage control module that controls a magnitude of the first output voltage and a magnitude of the second output voltage such that the first output voltage is greater than the second output voltage at least once and the second output voltage is greater than the first output voltage at least once prior to a failure of one of the first and second power supplies.