Quasiresonant control with a dynamic frequency selector and constant current startup technique for 92% peak efficiency and 85% light-load efficiency flyback converter

Yu Chai Kang, Chao Chang Chiu, Moris Lin, Chih Pu Yeh, Jinq Min Lin, Ke-Horng Chen

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The proposed quasiresonant control scheme can be widely used in a dc-dc flyback converter because it can achieve high efficiency with minimized external components. The proposed dynamic frequency selector improves conversion efficiency especially at light loads to meet the requirement of green power since the converter automatically switches to the discontinuous conduction mode for reducing the switching frequency and the switching power loss. Furthermore, low quiescent current can be guaranteed by the constant current startup circuit to further reduce power loss after the startup procedure. The test chip fabricated in VIS 0.5 μm 500 V UHV process occupies an active silicon area of 3.6 mm2. The peak efficiency can achieve 92% at load of 80 W and 85% efficiency at light load of 5 W.

Original languageEnglish
Article number6516013
Pages (from-to)4959-4969
Number of pages11
JournalIEEE Transactions on Power Electronics
Volume29
Issue number9
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Constant current startup (CCS) circuit
  • discontinuous conduction mode (DCM)
  • dynamic frequency selector (DFS)
  • proportion integral compensator

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