US 9,812,998 B2
Method for controlling inverter
Deok-Young Lim, Gyeonggi-do (KR); and Chun-Suk Yang, Gyeonggi-do (KR)
Assigned to LSIS CO., LTD., Gyeonggi-Do (KR)
Filed by LSIS CO., LTD., Gyeonggi-do (KR)
Filed on Jun. 2, 2016, as Appl. No. 15/171,690.
Claims priority of application No. 10-2015-0077710 (KR), filed on Jun. 2, 2015.
Prior Publication US 2016/0359432 A1, Dec. 8, 2016
Int. Cl. H02P 21/00 (2016.01); H02P 3/18 (2006.01); H02M 1/32 (2007.01); H02P 21/36 (2016.01); F16P 3/00 (2006.01); H02P 27/00 (2006.01)
CPC H02P 3/18 (2013.01) [F16P 3/00 (2013.01); H02M 1/32 (2013.01); H02P 21/36 (2016.02); H02P 27/00 (2013.01); H02M 2001/322 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for controlling an inverter driven with an input power, to speed up residual energy discharge at the inverter when a safety signal is input to the inverter, the method comprising:
determining whether the safety signal is input to the inverter;
generating an I/O failure output relay signal to interrupt the input power if it is determined that the safety signal is input; and
performing a process of discharging residual energy at a smoothing stage of the inverter and fan drive,
wherein when the inverter performs current control, the process of discharging the residual energy comprises:
performing a DC excitation process;
determining whether a low voltage trip occurs in the inverter; and
determining whether a voltage of the smoothing stage of the inverter is less than a predetermined voltage.