Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Hybrid Control Strategy of Phase-Shifted Full-Bridge LLC Converter Based on Digital Direct Phase-Shift Control

  • Guo, Bing (Faculty of Information Technology, Beijing University of Technology) ;
  • Zhang, Yiming (Faculty of Information Technology, Beijing University of Technology) ;
  • Zhang, Jialin (Faculty of Information Technology, Beijing University of Technology) ;
  • Gao, Junxia (Faculty of Information Technology, Beijing University of Technology)
  • Received : 2017.10.10
  • Accepted : 2018.02.06
  • Published : 2018.05.20
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Abstract

A digital direct phase-shift control (DDPSC) method based on the phase-shifted full-bridge LLC (PSFB-LLC) converter is presented. This work combines DDPSC with the conventional linear control to obtain a hybrid control strategy that has the advantages of linear control and DDPSC control. The strategy is easy to realize and has good dynamic responses. The PSFB-LLC circuit structure is simple and works in the fixed frequency mode, which is beneficial to magnetic component design; it can realize the ZVS of the switch and the ZCS of the rectifier diode in a wide load range. In this work, the PSFB-LLC converter resonator is analyzed in detail, and the concrete realization scheme of the hybrid control strategy is provided by analyzing the state-plane trajectory and the time-domain model. Finally, a 3 kW prototype is developed, and the feasibility and effectiveness of the DDPSC controller and the hybrid strategy are verified by experimental results.

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References

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