Feed-forward active filter for output ripple cancellation

Pallab Midya, Philip T. Krein

Research output: Contribution to journalArticlepeer-review


An active filter for DC-DC converter ripple cancellation is described and demonstrated. The feed-forward technique used applies to any converter with an output filter inductor. The technique is inherently stable, performs in both continuous and discontinuous conduction modes, and applies to both square-wave and resonant converters. A suitable linear amplifier, combined with a current transformer, implements it with low loss. An adaptive tuning scheme compensates for inductance variation and drift. Operation is demonstrated with buck, push-pull, and boost converter topologies. The result is output ripple below 10 mV RMS, effective on converters with outputs as low as 2 V and currents above 30 A.

Original languageEnglish (US)
Pages (from-to)805-818
Number of pages14
JournalInternational Journal of Electronics
Issue number5
StatePublished - Nov 1994

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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