US 12,244,245 B2
Transport refrigeration system with paralleled inverters
Raymond L. Senf, Jr., Central Square, NY (US)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Filed by Carrier Corporation, Palm Beach Gardens, FL (US)
Filed on Oct. 18, 2021, as Appl. No. 17/503,624.
Prior Publication US 2023/0119462 A1, Apr. 20, 2023
Int. Cl. H02M 7/493 (2007.01); B60P 3/20 (2006.01)
CPC H02M 7/493 (2013.01) [B60P 3/20 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of operating a transport refrigeration system having a plurality of inverters configured to power a refrigeration unit, the method comprising:
placing a first inverter of the plurality of inverters in an active state;
monitoring a load on the first inverter;
comparing the load on the first inverter to an upper threshold;
placing a second inverter of the plurality of inverters in an active state upon the load on the first inverter being greater than the upper threshold;
monitoring the load on the first inverter;
monitoring the load on the second inverter;
comparing the load on the first inverter and the load on the second inverter to a lower threshold;
placing one of the first inverter and the second inverter in an inactive state upon the load on the first inverter and the load on the second inverter being less than the lower threshold;
wherein the upper threshold and the lower threshold are different values;
wherein the first inverter and the second inverter are multiphase inverters, each generating a multiphase AC output in the active state;
wherein the first inverter and the second inverter are configured to power a compression device of the refrigeration unit of the transport refrigeration system.