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Simulating the EMI Characteristics of Flyback DC/DC Converters

Andreas Karvonen (Institutionen för energi och miljö, Elteknik) ; Torbjörn Thiringer (Institutionen för energi och miljö, Elteknik)
Intelec 2011 - The International Telecommunications Energy Conference 2011 (0275-0473). (2011)
[Konferensbidrag, refereegranskat]

In this article, the influence of diode reverse recovery on EMI performance of a low power flyback converter is investigated. Two different diode models (SPICE and SABER®) are analyzed and the conducted emissions from a simulated converter with a thorough characterization of the parasitic elements are compared to measurements. It is concluded that the emission levels to a large extent is determined by the mutual couplings within the input filter. The proposed simulation model predicts EMI levels up to 20MHz with good accuracy. Furthermore, it is concluded that the diode reverse recovery is reflected into the conducted emissions. For the investigated case, a recovery peak of IRR=2.8A gives an increase in emission levels with 3dB around 10MHz compared to a diode with IRR=1.0A. Finally, it was found that Schottky diodes may decrease the EMI performance of the converter; the large inherent capacitance can cause large oscillations in the circuit that are reflected into the conducted emissions.

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Denna post skapades 2011-08-16. Senast ändrad 2012-04-11.
CPL Pubid: 144353


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Institutioner (Chalmers)

Institutionen för energi och miljö, Elteknik



Chalmers infrastruktur