Low output ripple DC-DC converter based on an overlapping dual asymmetric half-bridge topology

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

41 Citations (Scopus)


A new converter topology is described for applications requiring very low output current ripple. The proposed converter consists of two asymmetric half-bridge converters whose output voltages overlap in a finite interval of time. This converter provides well regulated and smooth dc output without the need of an output filter. The output voltage is regulated by direct amplitude modulation. Unlike the standard interleaved converters, the proposed converter is robust to input voltage and operating duty cycle variations. Furthermore, equal current sharing is automatically achieved under all conditions, thus ensuring full utilisation of the output rectifiers for wide input and output ranges. The circuit achieves zero-voltage turnon for all primary switches and zero-current turnoff for the output rectifiers. An isolated dc-dc converter prototype with 5-V output voltage and 20-A output current has been built to verify the design.
Original languageEnglish
Pages (from-to)1956-1963
Number of pages8
JournalIEEE Transactions on Power Electronics
Issue number5
Publication statusPublished - 1 Sept 2007


  • DC-DC converter
  • Half-bridge converter
  • Low output ripple
  • Zero-current turnoff
  • Zero-voltage turnon

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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