Ground Bridge Effect on Reduction of Conducted Emission from Three-Phase Motor Drive System
In electric vehicles, the pulse width modulation scheme is widely used in three-phase motor drive systems for its high performance. However, the fast switching of semiconductor devices may induce excessively high dv/dt and di/dt, which can cause electromagnetic interference (EMI) issues, making it difficult to satisfy electromagnetic compatibility standards. In this paper, the current conducted emission test for a three-phase motor drive system is performed based on CISPR 25 component-level testing setup for AM radio frequency band, which is from 530 kHz to 1.8 MHz. Under these conditions, common-mode (CM) noise generation mechanisms of the motor drive system are identified through measurements. It is found that the dominant mechanism is the mode conversion from differential mode (DM) switching current of the three-phase PWM inverter to CM current through the cable harness due to the imbalances in the PCB structure and EMI filter network which are at the dc input side of the three-phase inverter. Based on this finding, ground (GND) bridges are added between the digital signal and power GND nets to reduce the CM noise. The GND bridge effect on the reduction of CM noise in AM band is experimentally verified and further studied using circuit simulations.
Y. Guo et al., "Ground Bridge Effect on Reduction of Conducted Emission from Three-Phase Motor Drive System," Proceedings of the 2019 International Symposium on Electromagnetic Compatibility (2019, Barcelona, Spain), pp. 854-859, Institute of Electrical and Electronics Engineers (IEEE), Sep 2019.
The definitive version is available at https://doi.org/10.1109/EMCEurope.2019.8871992
2019 International Symposium on Electromagnetic Compatibility, EMC Europe 2019 (2019: Sep. 2-6, Barcelona, Spain)
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
CISPR 25; Conducted Emission; Electromagnetic Compatibility; Electromagnetic Interference; Mode Conversion; Three-Phase Inverter; Three-Phase Motor
International Standard Book Number (ISBN)
Article - Conference proceedings
© 2019 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
06 Sep 2019