Filter Configuration and PWM Method for Single-Phase Inverters with Reduced Conducted EMI Noise

Mohammad H. Hedayati, Vinod John

Research output: Contribution to journalArticle (Academic Journal)peer-review

39 Citations (Scopus)


Electromagnetic interference (EMI) noise is one of the major issues during design of grid-tied power converters. A novel LCL filter topology for a single-phase pulsewidth modulation (PWM) rectifier that makes use of bipolar PWM method is proposed for a single-phase to three-phase motor drive power converter. The proposed topology eliminates high dv/dt from the dc-bus common-mode (CM) voltage by making it sinusoidal. Hence, the high-frequency CM current injection to the ground and the motor-side CM current are minimized. The proposed filter configuration makes the system insensitive to circuit nonidealities such as mismatch in inductors values, unequal turn-on and turn-off delays, and dead-time mismatch between the inverter legs. Different variants of the filter topology are compared to establish the effectiveness of the proposed circuit. Experimental results based on the EMI measurement on the grid side and the CM current measurement on the motor side are presented for a 5-kW motor drive. It is shown that the proposed filter topology reduces the EMI noise level by about 35 dB.

Original languageEnglish
Article number7001235
Pages (from-to)3236-3243
Number of pages8
JournalIEEE Transactions on Industry Applications
Issue number4
Publication statusPublished - 1 Jul 2015


  • AC motor drive
  • AC-AC power conversion
  • bipolar PWM
  • common mode current
  • common mode voltage
  • conducted emissions (CEs)
  • single-phase PWM-Rectifier
  • unipolar PWM


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