| 摘要 |
Heavily relied upon network devices require backup power systems. To efficiently allocate power, a highly programmable backup power system is desired. The present invention discloses a redundant power supply unit that provides backup power to network devices. The redundant power supply unit will supply power to the network devices in the case that their local internal power supplies fail. Furthermore, if there is a power outage from the utility company, the redundant power supply will supply power to the network devices from a internal battery pack. When the internal battery pack is engaged, the redundant power supply uses programmed control logic that controls how the power from internal battery pack will be allocated. Specifically, since the power from the batteries is limited, it can be used to power some network devices for a certain amount of time and other network devices for a longer amount of time. Furthermore, the power from the batteries can be allocated depending on the voltage level of the battery thus, when the battery voltage drops below a certain threshold the power supply may disconnect power to some units and maintain power to others.
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