US 11,955,838 B2
Fuel cell based uninterruptible power supply systems
George Arthur Navarro, Raleigh, NC (US); Swanand Juvekar, Morrisville, NC (US); and Vincent Edward Wilder, Clayton, NC (US)
Assigned to Eaton Intelligent Power Limited, Dublin (IE)
Filed by Eaton Intelligent Power Limited, Dublin (IE)
Filed on Apr. 27, 2021, as Appl. No. 17/241,178.
Claims priority of provisional application 63/016,634, filed on Apr. 28, 2020.
Prior Publication US 2021/0336475 A1, Oct. 28, 2021
Int. Cl. H02J 9/06 (2006.01)
CPC H02J 9/068 (2020.01) [H02J 9/062 (2013.01); H02J 2300/30 (2020.01)] 12 Claims
OG exemplary drawing
 
1. A system comprising:
a DC bus;
an auxiliary power source coupled to the DC bus;
an energy storage device of a different type than the auxiliary power source; and
a modular uninterruptible power supply (UPS) comprising:
a first uninterruptible power module (UPM) coupled to the DC bus and configured to provide power to an AC load from the auxiliary power source; and
a second UPM coupled to the DC bus and the energy storage device and configured to compensate for a delay of a load step response of the auxiliary power source by transferring energy between the DC bus and the energy storage device to regulate a voltage on the DC bus, wherein an AC port of the first UPM is coupled to a first input of an automatic transfer switch (ATS), wherein an AC power source is coupled to a second input of the ATS, and wherein the ATS is configured to selectively provide power from the first UPM and the AC power source to a load connected to an output of the ATS.