A novel method for elimination of line-current harmonics in single-stage PFC switching regulators

Martin H L Chow, K. W. Siu, Chi Kong Tse, Yim Shu Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

45 Citations (Scopus)


This paper studies a particular single-stage power-factor-correction (PFC) switching regulator employing a discontinuous-conduction-mode (DCM) boost-input cell and a continuous-current-mode (CCM) forward output cell. Although this single-stage PFC regulator can provide a reasonably high power factor when its PFC stage is operating in discontinuous mode, substantial reduction in line-current harmonics is possible by applying a suitable frequency-modulation scheme. This paper derives a frequency-modulation scheme and proposes a practical implementation using a simple translinear analog circuit. A quantitative analysis on the total harmonics distortion (THD) of the line current when the circuit is subject to a limited range of frequency variation is presented along with some considerations for practical design. Experimental data obtained from a prototype confirms the effectiveness of the proposed frequency-modulation scheme. The proposed analog translinear circuit allows custom integrated circuit (IC) implementation, making it a viable low-cost solution to the elimination of line-current harmonics in switching regulators.
Original languageEnglish
Pages (from-to)75-83
Number of pages9
JournalIEEE Transactions on Power Electronics
Issue number1
Publication statusPublished - 1 Dec 1998


  • Control
  • Power factor correction
  • Switch-mode power supplies

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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