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.