US 9,812,897 B2
Apparatus, system, and method for providing power redundancy to a device designed to draw power from a single external power adapter
Paulo Rodrigues, Surrey (GB)
Assigned to Juniper Networks, Inc., Sunnyvale, CA (US)
Filed by Juniper Networks, Inc., Sunnyvale, CA (US)
Filed on Jul. 5, 2013, as Appl. No. 13/936,056.
Claims priority of application No. 1308107.0 (GB), filed on May 5, 2013.
Prior Publication US 2014/0328094 A1, Nov. 6, 2014
Int. Cl. H02J 9/00 (2006.01); H02J 7/00 (2006.01); H02J 9/06 (2006.01); H02J 3/14 (2006.01); H02J 1/10 (2006.01); H02J 4/00 (2006.01); H02M 1/10 (2006.01)
CPC H02J 9/06 (2013.01) [H02J 1/10 (2013.01); H02J 3/14 (2013.01); H02J 4/00 (2013.01); H02M 1/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a single physical enclosure that houses:
a plurality of power inputs configured to receive direct current from a plurality of external power adapters, which are external to the single physical enclosure, that convert alternating current to direct current, the plurality of external power adapters comprising a primary external power adapter and at least one backup external power adapter;
a single power output configured to provide direct current to a device that is external to the single physical enclosure and configured to draw direct current from a single external power adapter;
a switching mechanism comprising a portion of memory and a communication infrastructure that both monitor power provided via the plurality of external power adapters and continuously supply power to the device by:
detecting when the primary external power adapter is operational by detecting when direct current is received at a power input connected to the primary external power adapter;
detecting when the primary external power adapter fails by detecting when no direct current is received at the power input connected to the primary external power adapter;
supplying direct current from the primary external power adapter to the power output when the primary external power adapter is operational and supplying direct current from the backup external power adapter to the power output when the primary external power adapter fails.