US 12,449,876 B1
Apparatus, system, and method for boosting internal voltages of power supply units to extend hold-up times
Siri Subrahmanyam Vadlamani, Bangalore (IN); and Prakash B. Kamanuri, Kalyan Maharashtra (IN)
Assigned to Juniper Networks, Inc., Sunnyvale, CA (US)
Filed by Juniper Networks, Inc., Sunnyvale, CA (US)
Filed on Mar. 16, 2023, as Appl. No. 18/184,836.
Int. Cl. G06F 1/30 (2006.01); H02M 1/00 (2007.01); H02M 1/42 (2007.01); H02M 7/21 (2006.01); H02M 7/217 (2006.01)
CPC G06F 1/30 (2013.01) [H02M 1/0054 (2021.05); H02M 1/4225 (2013.01); H02M 7/217 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a power supply unit (PSU) that comprises:
a first switch electrically coupled between a first node and a second node;
a second switch electrically coupled between a third node and a fourth node;
a third switch electrically coupled between the third node and a fifth node;
a first capacitor electrically coupled between the first node and the third node;
a second capacitor electrically coupled between the second node and the fourth node; and
a third capacitor electrically coupled between the fourth node and the fifth node, wherein:
the PSU is 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;
the first node comprises a power rail configured to deliver electric current from the first capacitor and the second capacitor to a pulse-width modulation (PWM) stage of the PSU;
the third node comprises a variable node configured to be selectively shorted to an electrical ground when the second switch is opened and the third switch is closed;
the fourth node comprises a branching node configured to provide electric current from the third capacitor to the PWM stage via the first capacitor and the second capacitor when the second switch is closed and the third switch is opened; and
the fifth node comprises the electrical ground; and
circuitry configured to:
detect a loss of the AC input; and
in response to detecting the loss of the AC input, extend a hold-up time of the PSU by modifying an operational state of at least one switch included in the PSU.