Power budget management in power over ethernet systems

Details Power budget management in power over ethernet systems Power budget management in power over ethernet systems

2011-01-04

2011-01-04

Cao, Chun (Department: 2115)

Electrical computers and digital processing systems: support

Computer power control

Having power source monitoring

C713S300000, C326S009000

Reexamination Certificate

active

07865754

ABSTRACT:
A power budget monitoring circuit in a multi-port PSE includes a differential amplifier and a transistor for setting a reference voltage across a first resistor to establish a reference current, multiple current mirror output devices each associated with a power port of the PSE, a second resistor and a comparator. Each current mirror output device provides an output current indicative of the power demanded by the associated power port where the output currents are summed at a second node into a monitor current. The second resistor has a resistance value proportional to a maximum power budget of the PSE and receives the monitor current. A monitor voltage develops across the second resistor indicative of the total power demanded by the power ports. The comparator compares the monitor voltage to the reference voltage and provides a comparator output signal indicating whether the maximum power budget of the PSE has been exceeded.

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