US 12,459,376 B2
Optimization of switching frequency and pulse width modulation technique for traction power inverters
Hassan H. Eldeeb, Carmel, IN (US); Ujjwal Kumar, Rochester Hills, MI (US); Ronald J. Krefta, Noblesville, IN (US); and Caleb W. Secrest, Noblesville, IN (US)
Assigned to BorgWarner Inc., Auburn Hills, MI (US)
Filed by BorgWarner Inc., Auburn Hills, MI (US)
Filed on Oct. 4, 2023, as Appl. No. 18/376,599.
Prior Publication US 2025/0115139 A1, Apr. 10, 2025
Int. Cl. H02P 6/08 (2016.01); B60L 15/04 (2006.01); B60L 15/20 (2006.01); H02M 1/00 (2006.01); H02M 7/5395 (2006.01)
CPC B60L 15/2045 (2013.01) [B60L 15/04 (2013.01); B60L 15/2009 (2013.01); B60L 15/2072 (2013.01); H02M 1/0058 (2021.05); H02M 7/5395 (2013.01); B60L 2210/42 (2013.01); B60L 2240/423 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of operating a power inverter for an electric machine, comprising the steps of:
(a) selecting an inverter switching technique;
(b) determining a frequency range for inverter switching;
(c) determining a direct current (DC) voltage range for inverter switching;
(d) determining a maximum efficiency at each torque-speed value along the torque-speed curve based on an alternating current (AC) ripple;
(e) determining an optimal switching map including an inverter switching technique and frequency selection for each value of torque-speed on a torque-speed curve; and
(f) controlling switches included in the inverter using the optimal switching map.