US 12,273,024 B2
Common mode electromagnetic interference mitigation
Seungdeog Choi, Starkville, MS (US); and Ashik Amin, Starkville, MS (US)
Filed by Seungdeog Choi, Starkville, MS (US); and Ashik Amin, Starkville, MS (US)
Filed on Oct. 6, 2021, as Appl. No. 17/495,585.
Claims priority of provisional application 63/089,993, filed on Oct. 9, 2020.
Prior Publication US 2022/0216784 A1, Jul. 7, 2022
Int. Cl. H02M 1/44 (2007.01); G05F 1/613 (2006.01); H02M 1/12 (2006.01); H02M 7/5387 (2007.01); H02M 7/797 (2006.01); H02M 1/00 (2007.01)
CPC H02M 1/44 (2013.01) [H02M 1/123 (2021.05); G05F 1/613 (2013.01); H02M 1/0043 (2021.05); H02M 7/53871 (2013.01); H02M 7/797 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method comprising:
coupling a controller to a circuit including a first power converter, wherein the first power converter is mounted to a first conductive base plate, wherein the first conductive base plate is connected to a heat sink, wherein the circuit further includes a second power converter, wherein the second power converter is mounted to a second conductive base plate, wherein the second conductive base plate is connected to the heat sink, and wherein the heat sink is connected to a common ground plane that is common to both the first power converter and the second power converter;
controlling, by the controller coupled to the circuit, the first power converter to generate a first electromagnetic interference (EMI) signal having a first phase by controlling switching timing of the first power converter; and
controlling, by the controller coupled to the circuit, the second power converter to generate a second EMI signal by controlling switching timing of the second power converter, the second EMI signal having a second phase that is selected based on the first phase and that is selected to reduce EMI in the circuit by destructively interfering with the first EMI signal at the first phase when the first EMI signal generated by the first power converter and the second EMI signal generated by the second power converter enter the common ground plane through the first and second conductive base plates and the heat sink.