Sliding Mode Control Scheme for a CLLC Resonant Converter

Shenli Zou, Ayan Mallik, Jiangheng Lu, Alireza Khaligh

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


In this paper, a comprehensive sliding mode control (SMC) loop design for a CLLC resonant converter is proposed. The major objectives of the proposed SMC are to improve the converter dynamics and to achieve a tight output voltage regulation with respect to any parameter variations and external disturbances. The sliding surface coefficients are selected to ensure both large-and small-signal stability for the robustness of the converter under different operating conditions. Furthermore, system dynamic performances considering the error dynamics and overshoots are investigated. To validate the proposed algorithm, a hardware prototype of a bi-directional CLLC resonant converter for plug-in electric vehicle applications is developed and tested up to 1 kW, and the effectiveness of the proposed control solution is verified by the load transients and start-up tests. At a 100% step-change in load power, the SMC achieves 1 ms settling time, which is approximately 0.9 ms faster than the conventional proportional integral control strategy.

Original languageEnglish (US)
Article number8664605
Pages (from-to)12274-12284
Number of pages11
JournalIEEE Transactions on Power Electronics
Issue number12
StatePublished - Dec 2019
Externally publishedYes


  • CLLC
  • electric vehicles (EV)
  • resonant converter
  • robustness
  • sliding mode control (SMC)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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