High-Attenuation Wideband Active Common-Mode EMI Filter Section
Overview
The Centre for Smart Energy Conversion and Utilization Research of CityU has developed a novel active common-mode filter that consists of active capacitors and small common-mode chokes to reduce the volume and weight of traditional passive filters.
Research completion
2021
Commercialisation opportunities
technology licensing agreement
Problem addressed
The proposed active common-mode filter significantly reduces the volume and weight of traditional passive EMI filters without increasing the filter's power dissipation.
Innovation
- The invention has high attention to common-mode EMI noise and can flexibly satisfy the filtering demands of different applications by using a multistage structure.
- The invention has a wide bandwidth covering the whole frequency range of conducted EMI (150kHz-30MHz).
Key impact
- Low cost and high immunity to high voltage transients.
- High attention to common-mode EMI noise.
- Wide bandwidth.
- General multistage structure that suits different applications.
Application
- Different models and types of switching power supplies
Patent
- US patent application no. 17/469,858
City University of Hong Kong (CityU)
As one of the fastest growing universities in the world over the past decade, City University of Hong Kong (CityU) is recognised as a hub for innovation in research and professional education. CityU identifies solutions to critical global challenges by extending the frontiers of knowledge both within and beyond existing research paradigms.
The University’s highly qualified academics are drawn from all over the world, not only bringing a wealth of research and professional experience to the teaching programmes, but also contributing to the knowledge and technology advancement.
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