US 11,996,690 B2
Transformer rectifier unit (TRU) backfeed interlock
Jordan K. Vanevenhoven, Rockford, IL (US); Jeffrey D. Myroth, Roscoe, IL (US); Jef William Good, German Valley, IL (US); Shane R. Traser, Rockford, IL (US); John N. Buzzard, Rockford, IL (US); and Kyle Stephen Ives, Loves Park, IL (US)
Assigned to Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Nov. 5, 2021, as Appl. No. 17/519,857.
Prior Publication US 2023/0147395 A1, May 11, 2023
Int. Cl. H02H 7/22 (2006.01); H02H 1/00 (2006.01); H02J 4/00 (2006.01)
CPC H02H 7/22 (2013.01) [H02H 1/0007 (2013.01); H02J 4/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a transformer rectifier unit (TRU) including a backfeed sense module;
a contactor operatively connected to the TRU for selectively supplying DC power to a DC bus from the TRU with the contactor closed and isolating the DC bus from the TRU with the contactor opened; and
a contactor driver operatively connected to receive a signal from the backfeed sense module and to control opening and closing of the contactor based on the signal, wherein the contactor driver is configured to open the contactor upon receipt of the signal indicative of backfeed detected in the TRU, wherein the TRU is a first TRU, wherein the contactor is a first TRU contactor, and further comprising:
a first AC bus configured to supply power from a first AC power source;
a second AC bus configured to supply power from a second AC power source;
the first TRU connecting a first DC bus to the first AC bus through the first TRU contactor;
a second TRU connecting a second DC bus to the second AC bus through a second TRU contactor;
a first DC essential bus connected to the first DC bus through a first essential contactor;
a second DC essential bus connected to the second DC bus through a second essential contactor;
an essential TRU connected to a third DC essential bus through an essential TRU contactor;
a first essential tie contactor (ETC) selectively connecting between the first DC essential bus and the third DC essential bus;
a second ETC selectively connecting between the third DC essential bus and the second DC essential bus;
an AC essential bus tie contactor (AETC) selectively connecting between an AC essential bus and the first and second AC busses; and
a ram air turbine (RAT) line contactor connecting between the AETC and the AC essential bus to selectively connect a RAT to the AC essential bus.