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Standard solution to reduce switching ripple in power converters is to employ LC(L) output filters, with higher attenuation requiring higher switching frequency and/or larger filter size. High switching frequency can increase the converter losses, whereas large filter reduces the bandwidth and increases cost of the power converter. The alternative path of increasing the filter order is taken in this paper. To be more exact, a 6th order filter consisting of 3 series connected LC blocks is employed to achieve very high ripple attenuation and increased converter bandwidth without increasing the switching frequency. In contrast to previously proposed high-order filter solutions active damping is employed yielding no penalty to the converter efficiency. The active damping is achieved via state-feedback control, i.e., Linear Quadratic Regulator, with the state information reconstructed only from capacitor voltage measurements with a Luenberger observer. The complete design is evaluated in simulations and validated on the experimental synchronous buck converter achieving in excess of −80 db ripple attenuation in one decade.
|Title of host publication||Proceedings of the IECON 2016 - 42nd Annual Conference of IEEE Industrial Electronics Society, 23-26 October 2016, Florence, Italy|
|Publisher||Institute of Electrical and Electronics Engineers|
|Publication status||Published - 2016|
|Event||42nd Annual Conference of the IEEE Industrial Electronics Society, IECON 2016 - Palazzo dei Congressi, Firenze, Italy|
Duration: 24 Oct 2016 → 27 Oct 2016
Conference number: 42
|Conference||42nd Annual Conference of the IEEE Industrial Electronics Society, IECON 2016|
|Abbreviated title||IECON 2016|
|Period||24/10/16 → 27/10/16|
- High-order filters
- state-feedback control
- active damping
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- 1 Finished
Hendrix, W. H. A., Nawijn, H. & van der Hagen, D.
1/01/15 → 31/12/19
Project: Research direct