EMI and Power Quality
 |
The switching-mode power electronics systems generate significant conducted electromagnetic interference (EMI) in a broad spectrum. This EMI can be detrimental to the normal operation of other electronics systems. The EMI must be suppressed to an acceptable level before it can propagate to other systems. EMI noise is traditionally categorized as either differential mode (DM) or common mode (CM) noise. DM noise is the noise current flowing within the power delivery paths, while CM noise is the noise current flowing between the ground and the power circuits. EMI study is a very extensive field, while most of work in the CPES at Virginia Tech focuses on the generation, mitigation, propagation, measurement of EMI in power electronics systems, as well as the improvement of their power quality.
Recent studies consist of the following topics:
- Generation and characterization of EMI noise
- Parasitic reduction and cancellation for EMI filters
- EMI noise, separation and measurement techniques
- High power density hybrid EMI filter design for motor drive system
- CM noise reduction with balance and parasitic cancellation techniques
- Active EMI filters
- Integrated EMI filters with planar structure
- Many techniques have been developed in this area in CPES. These techniques have been published in IEEE journal and presented in different conferences. Some of them have also been granted patents.
 |
| Integrated EMI filters with planar structure |
Related CPES Research Volumes:
1. Low Voltage Power Conversion and Distributed Power Systems (Volume IX)
2. Integrated Power Electronics Module - a Building Block Concept for System Integration (Volume X)
3. Conducted EMI and Power Electronics: Characterization and Mitigation (Volume XII)