System and method for power sourcing equipment detection of a powered device power failure for power backup
AssigneeBroadcom Corporation
InventorsWael William Diab, Sesha Thalpasai Panguluri, Hemanth Nekkileru
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Abstract
A system and method for power sourcing equipment (PSE) detection of a powered device (PD) power failure for power backup. A PSE can power a PD at a low level of power as a backup power source. Upon a failure in the PDs primary power source, the PSE can detect a transient (e.g., current and/or voltage) on the PD load as a signal that the PD requires additional power. The PSE can then allocate increased power to the port by entering into an active state as compared to a backup state. As the PSE is responsive to the detection of the transient, the PSE need not rely on a real-time communication from the PD.
Claims19
A method in a power sourcing equipment for operating as a backup power source, comprising:
- delivering a first level of power on a port coupled to a powered device via a communication cable, said first level of power enables the power sourcing equipment to operate in an active standby mode for said powered device, wherein during said active standby mode said powered device is primarily powered by a local power source that delivers power to said powered device via a second cable separate from said communication cable;
- detecting a transient condition on said port, said transient condition being indicative of a failure in said local power source;
- and
- delivering a second level of power to said port in response to said detection of said transient condition, said second level of power being greater than said first level of power.
A power sourcing equipment, comprising:
- a sensing module that measures a voltage or current on an output port while said power sourcing equipment is in a backup power source mode, wherein during said backup power source mode, a powered device coupled to said output port via a communication cable receives power from a local power source via a second cable separate from said communication cable;
- and
- a power controller that controls a delivery of power on said output port, said power controller increasing the power delivery by the power sourcing equipment to said powered device on said output port upon an indication of a voltage or current transient condition by said measurements by said sensing module, wherein said voltage or current transient condition is indicative of a failure in said local power source.
A power over Ethernet method in a power sourcing equipment, comprising:
- delivering a first level of power to a port coupled to a powered device via a communication cable, wherein said first level of power in combination with a concurrent delivery of power from a local power source to said powered device is sufficient for said powered device to fully function, said local power source delivering power to said powered device via a cable different from said communication cable;
- detecting a transient condition on said port that is indicative of a failure in said local power source;
- and
- delivering a second level of power to said port in response to said detection of said transient condition, wherein said second level of power is designed to offset at least part of a reduction in capacity of said local power source.
Dependencies are inferred from the claim text.