Control strategy for input-series-output-parallel converter

Xinbo Ruan, Wu Chen, Lulu Cheng, Chi Kong Tse, Hong Yan, Tao Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

219 Citations (Scopus)


The input-series-output-parallel (ISOP) converter, which consists of multiple dc-dc converter modules connected in series at the input and in parallel at the output, is an attractive solution for high input voltage and high power applications. This paper reveals the relationship between input voltage sharing (IVS) and output current sharing of the constituent modules of the ISOP converter. A novel IVS control strategy, which is decoupled with the output voltage regulation, is proposed. This control allows IVS and output voltage regulation to be designed independently. An ISOP converter, which uses the phase-shifted full-bridge (PS-FB) converter as the basic module, is considered. Based on the proposed control strategy, this ISOP converter together with the control circuit can be decoupled from several independent single-input and single-output systems. An ISOP converter consisting of three PS-FB modules is used to illustrate the design procedure, and a 3-kW experimental prototype is fabricated and tested.
Original languageEnglish
Pages (from-to)1174-1185
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Issue number4
Publication statusPublished - 13 May 2009


  • Current sharing
  • Dc/dc converter
  • Parallel
  • Phase-shifted control
  • Series
  • Voltage sharing

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Computer Science Applications


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