US 12,449,877 B1
Apparatus, system, and method for protecting power supply units from damage by limiting inrush current
Siri Subrahmanyam Vadlamani, Konaseema District (IN); Prakash B. Kamanuri, Thane (IN); and Jaspal S. Gill, Tracy, CA (US)
Assigned to Juniper Networks, Inc., Sunnyvale, CA (US)
Filed by Juniper Networks, Inc., Sunnyvale, CA (US)
Filed on Jul. 26, 2023, as Appl. No. 18/359,475.
Int. Cl. G06F 1/30 (2006.01); H02M 1/42 (2007.01); H02M 1/44 (2007.01); H02M 7/06 (2006.01)
CPC G06F 1/305 (2013.01) [H02M 1/4208 (2013.01); H02M 1/44 (2013.01); H02M 7/06 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a power supply unit (PSU) configured to:
convert power from an alternating current (AC) input into a direct current (DC) output; and
provide the DC output to a computing device; and
a controller configured to limit inrush current originating from the AC input by:
cycling at least one switch included in the PSU until a DC bulk voltage of the PSU reaches a certain threshold;
maintaining a first duty cycle of the at least one switch for a first plurality of cycles; and
upon completion of the first plurality of cycles, applying a second duty cycle to the at least one switch for a second plurality of cycles, wherein the second duty cycle is greater than the first duty cycle.