US 12,451,827 B2
Variable frequency drive system with medium voltage input and low voltage output
Benjamin J. Sykora, Stoddard, WI (US)
Assigned to TRANE INTERNATIONAL INC., Davidson, NC (US)
Filed by Trane International Inc., Davidson, NC (US)
Filed on Dec. 6, 2022, as Appl. No. 18/062,173.
Prior Publication US 2024/0186930 A1, Jun. 6, 2024
Int. Cl. H02P 23/04 (2006.01); H02P 25/18 (2006.01); H02P 27/06 (2006.01)
CPC H02P 23/04 (2013.01) [H02P 25/184 (2013.01); H02P 27/06 (2013.01); H02P 2201/01 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a transformer comprising a set of input terminals, a first set of output terminals, and a second set of output terminals;
first and second rectifiers coupled to the first and second sets of output terminals, respectively;
wherein the transformer is configured to transform three phase alternating current (AC) provided to the set of input terminals into first and second three phase AC outputs at the first and second sets of output terminals, respectively;
wherein the first three phase AC output is phase shifted from the second three phase AC output; and
wherein the transformer comprises:
a set of primary windings;
a first set of secondary windings and a second set of secondary windings; and
wherein the first set of secondary windings but not the second set of secondary windings is arranged in a zigzag configuration.