Reduces Electromagnetic Interference Radiation in DC/AC Power Converters
This common mode electromagnetic interference (EMI) filter reduces the electromagnetic resonance interfering in DC/AC power converters. In modern power electronics, Gallium-Nitride (GaN) devices can operate at higher switching frequencies than conventional Si MOSFET devices. However, with the ever-increasing development of high-switching frequency and the high-power density of power electronics, electromagnetic interference (EMI) is a significant problem. In power-electronic applications such as power adapters and electric vehicles, a common-mode current is a dominant source of EMI radiation. Additionally, the high-power density layout of the GaN devices degrades the EMI filter performance. At high frequencies, DC/AC power conversions produce electromagnetic resonance, causing power conversion inefficiency or failure. While reducing the common mode currents flowing between transformer primary and secondary windings can suppress the EMI radiation, the high-frequency performance of the devices leaves much to desire. It is vital to investigate the couplings within converters in high power-density designs.
Researchers at the University of Florida have developed a common-mode electromagnetic interference (EMI) filter for reducing EMI radiation in power converters. This filter will enable DC/AC power conversions at higher frequencies, improving conversion efficiency and reliability.
Application
Common mode filter reduces electromagnetic interference (EMI) in DC/AC power converts to enable performance at higher frequencies with improved reliability
Advantages
- Enables DC/AC power conversions to occur at higher frequencies, reducing the required transformer size and increasing the power density
- Reduces electromagnetic interference (EMI) radiation, increasing efficiency, frequency, and reliability of DC/AC power conversions
Technology
This common mode electromagnetic filter completes DC/AC power conversions at higher frequencies with reduced electromagnetic resonance and, in turn, greater efficiency. When DC/AC power conversions occur at higher frequencies, they produce electromagnetic resonance and can cause conversion inefficiency or even failure. The filter has multiple sets of Y-capacitors, as opposed to one, and shielding for connecting to the primary ground and secondary ground nodes. The converter can be one or more of an isolated converter, LLC resonant power converter, flyback converter, forward converter, or push-pull converter.
Brochure
