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Systems and methods of voltage based switching of a power supply system current are disclosed. In one embodiment, a power supply system includes a power bus to supply electrical power to a system load. A power supply is coupled to the power bus. The power supply provides current to the power bus and

Systems and methods of voltage based switching of a power supply system current are disclosed. In one embodiment, a power supply system includes a power bus to supply electrical power to a system load. A power supply is coupled to the power bus. The power supply provides current to the power bus and generates a voltage α. In addition, the system includes an additional power supply coupled to the power bus. The additional power supply generates a voltage β that is lower than the voltage α. An oring module restricts the additional power supply from providing current to the power bus, until a power bus voltage θ is greater than a threshold voltage.

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1. 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 b

1. 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; andan 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. 2. The power supply system of claim 1, wherein at least one of the first power supply and the second power supply is a switched mode power supply. 3. The power supply system of claim 1, wherein an operating power provided by the first power supply is within a threshold range of a power supply rating thereof. 4. The power supply system of claim 3, wherein an operating power provided by the second power supply is within a corresponding additional threshold range of an additional power supply rating thereof. 5. The power supply system of claim 4, wherein the power supply rating and the additional power supply rating are associated with a power level at which at least one of a performance, an efficiency, a time of operation, and a tolerance of power fluctuation is optimized. 6. The power supply system of claim 1, wherein the quiescent supply linearly transitions to become the active supply upon the failure of the active supply. 7. The power supply system of claim 1, wherein the controls further include raising the output voltage of the active supply to a target output voltage. 8. A method of a power supply system comprising: coupling a first power supply having a variable first output voltage with a second power supply having a variable second output voltage, wherein the coupling is in a parallel redundant configuration;providing current to a power bus through an ORed output of the first and second power supplies 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 a system load and the quiescent supply impresses essentially no current through the system load; andcontrolling, through an output voltage control module, 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. 9. The method of the power supply system of claim 8, wherein at least one of the first power supply and the second power supply is a switched mode power supply. 10. The method of the power supply system of claim 8, wherein an operating power provided by the first power supply is within a threshold range of a power supply rating thereof. 11. The method of the power supply system of claim 10, wherein an operating power provided by the second power supply is within a corresponding additional threshold range of an additional power supply rating thereof. 12. The method of the power supply system of claim 11, wherein the power supply rating and the additional power supply rating are associated with a power level at which at least one of a performance, an efficiency, a time of operation, and a tolerance of power fluctuation is optimized. 13. A power supply system comprising: a computing system load;a power bus to supply power to the 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; andan 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. 14. The power supply system of claim 13, wherein the computing system load comprises at least one of a non-volatile memory, a volatile memory, a server, a hard drive and a RAID system.