Hybrid Control Strategy of Phase-Shifted Full-Bridge LLC Converter Based on Digital Direct Phase-Shift Control

Bing Guo; Yiming Zhang; Jialin Zhang; Junxia Gao

Hybrid Control Strategy of Phase-Shifted Full-Bridge LLC Converter Based on Digital Direct Phase-Shift Control

Vol. 18, No. 3, pp. 802-816, May 2018

10.6113/JPE.2018.18.3.802

Dynamic performance

Full-bridge converter

LLC

Soft-switching

State-plane analysis

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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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Cite this article

[IEEE Style]

B. Guo, Y. Zhang, J. Zhang, J. Gao, "Hybrid Control Strategy of Phase-Shifted Full-Bridge LLC Converter Based on Digital Direct Phase-Shift Control," Journal of Power Electronics, vol. 18, no. 3, pp. 802-816, 2018. DOI: 10.6113/JPE.2018.18.3.802.

[ACM Style]

Bing Guo, Yiming Zhang, Jialin Zhang, and Junxia Gao. 2018. Hybrid Control Strategy of Phase-Shifted Full-Bridge LLC Converter Based on Digital Direct Phase-Shift Control. Journal of Power Electronics, 18, 3, (2018), 802-816. DOI: 10.6113/JPE.2018.18.3.802.