US 12,132,348 B2
Dual power switching system and method of controlling the same
Jen-Chuan Liao, Taoyuan (TW); Chien-Chih Chan, Taoyuan (TW); and Jia-Cheng Sie, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed on Feb. 3, 2023, as Appl. No. 18/164,488.
Claims priority of application No. 202210985413.4 (CN), filed on Aug. 17, 2022; and application No. 202211516426.3 (CN), filed on Nov. 30, 2022.
Prior Publication US 2024/0063656 A1, Feb. 22, 2024
Int. Cl. H02J 9/06 (2006.01); G01R 31/40 (2020.01); G01R 33/02 (2006.01)
CPC H02J 9/068 (2020.01) [G01R 31/40 (2013.01); G01R 33/02 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A dual power switching system, comprising:
a first static transfer switch, electrically coupled to a main power source,
a second static transfer switch, electrically coupled to a backup power source,
an inductive device, comprising a first side winding and a second side winding, wherein the first side winding is electrically coupled to the first static transfer switch and the second static transfer switch, and the second side winding is electrically coupled to a load, and
a controller, configured to detect an output power of the main power source and an output power of the backup power source, and acquire a predicted magnetic flux corresponding to the inductive device,
wherein when the controller detects that the main power source is abnormal, the controller detects a residual magnetic flux of the inductive device and calculates a magnetic flux difference between the predicted magnetic flux and the residual magnetic flux,
wherein when the controller determines that an absolute value of the magnetic flux difference is less than or equal to a magnetic flux deviation value, the controller determines whether the output power meets a forced commutation condition wherein the magnetic flux deviation value is a non-zero value set by the controller,
wherein when the controller determines that the output power meets the forced commutation condition, the controller turns on the second static transfer switch so that the first static transfer switch is forcibly turned off by the backup power source through the second static transfer switch.