US 12,470,083 B2
Powered device interface controller
Arkadiy Peker, Glen Cove, NY (US); Yair Darshan, Petach Tokva (IL); and Miguel Jacubovski, Hod Hasharon (IL)
Assigned to MICROCHIP TECHNOLOGY INCORPORATED, Chandler, AZ (US)
Filed by MICROCHIP TECHNOLOGY INCORPORATED, Chandler, AZ (US)
Filed on Jan. 4, 2024, as Appl. No. 18/404,554.
Claims priority of provisional application 63/525,815, filed on Jul. 10, 2023.
Prior Publication US 2025/0023382 A1, Jan. 16, 2025
Int. Cl. H02M 3/04 (2006.01); H02J 9/06 (2006.01)
CPC H02J 9/06 (2013.01) [H02M 3/04 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A powered device interface controller comprising:
a switch to control current to a powered device from a power sourcing equipment providing power to the powered device over a network cable, the powered device to also accept power from an auxiliary power source; and
control circuitry to at least:
detect a change-over from the auxiliary power source to the power sourcing equipment as a source of power for the powered device;
at least partially responsive to detection of the change-over from the auxiliary power source to the power sourcing equipment as the source of power for the powered device, control the switch to control the current to the powered device from the power sourcing equipment to a short circuit current limit for a period of time less than a short circuit time limit, to charge a bulk capacitor of the powered device, which short circuit current limit is greater than a startup inrush current limit of the powered device, wherein the short circuit current limit represents a maximum current the power sourcing equipment can deliver under a short-circuit condition and the short circuit time limit represents a duration that would trigger a shutdown of a port to which the powered device is connected if the powered device draws current of at least the short circuit current limit for the duration; and
subsequent to the control of the switch to control the current to the powered device from the power sourcing equipment to the short circuit current limit for the period of time less than a short circuit time limit, turn on the switch fully to allow the current from the power sourcing equipment to flow towards the powered device.