Techniques for input ripple current cancellation: Classification and implementation

N. K. Poon, J. C.P. Liu, Chi Kong Tse, M. H. Pong

Research output: Journal article publicationJournal articleAcademic researchpeer-review


Switching power supplies, due to their high-frequency switching operation, draw a substantial amount of input ripple current, which manifests as undesirable electromagnetic interference (EMI). This paper discusses the cancellation methods, and classifies the basic circuit configurations for ripple current cancellation. The basis of discussion is a `nullification' process, which can be described effectively in terms of the ideal circuit element nullor. Both active and passive implementation examples are given and experimentally demonstrated.
Original languageEnglish
Pages (from-to)940-945
Number of pages6
JournalPESC Record - IEEE Annual Power Electronics Specialists Conference
Publication statusPublished - 1 Jan 2000

ASJC Scopus subject areas

  • Modelling and Simulation
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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