US 12,348,170 B2
Electromagnetic interference (EMI) mitigation in pulse width modulation (PWM) inverters using learning-based frequency modulated carriers
Dehong Liu, Lexington, MA (US); Retsu Sugawara, Tokyo (JP); and Philip Orlik, Cambridge, MA (US)
Assigned to Mitsubishi Electric Research Laboratories, Inc.; and Mitsubishi Electric Corporation, Tokyo (JP)
Filed by Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US); and Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Aug. 25, 2023, as Appl. No. 18/238,061.
Claims priority of provisional application 63/528,691, filed on Jul. 25, 2023.
Prior Publication US 2025/0038695 A1, Jan. 30, 2025
Int. Cl. H02P 29/50 (2016.01); H02M 1/44 (2007.01); H02M 7/5395 (2006.01); H02P 27/08 (2006.01)
CPC H02P 29/50 (2016.02) [H02M 1/44 (2013.01); H02M 7/5395 (2013.01); H02P 27/08 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A controller for generating carrier signals controlling a pulse width modulation (PWM) inverter driving an electric actuator, comprising:
an interface configured to connect to a victim circuit via sensors, wherein the victim circuit includes the power system or the electric actuator or a combination of the power system and the electric actuator, wherein the sensors are configured to measure an electromagnetic-interference (EMI) spectrum;
a memory configured to store modulation frequency ranges, the measured electromagnetic-interference (EMI) spectrum, a desired EMI spectrum and a learning-based carrier design program; and
a processor, in connection with the memory, configured to perform:
generating a frequency modulation (FM) carrier signal by solving an optimization problem, wherein the optimization problem is generated regarding a sweep time for a predetermined frequency by the learning-based carrier design program; and
a PWM generator configured to generate PWM signals based on the FM carrier signal.