High Efficiency Variable-Frequency Full-Bridge Converter with a Load Adaptive Control Method Based on the Loss Model

Lei Zhao, Haoyu Li, Yuan Liu and Zhenwei Li
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Lei Zhao: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Haoyu Li: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Yuan Liu: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Zhenwei Li: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China

Energies, 2015, vol. 8, issue 4, 1-27

Abstract: In this paper, a load adaptive control method to improve the efficiency and dynamic performance of the Phase-Shifted Full-Bridge (PSFB) converter which works under a wide range of load conditions is presented. The proposed control method can be used as a battery charger since this application demands a wide range of load conditions. The composition of the PSFB converter’s losses and the loss analysis model are both discussed. According to this model, the optimum switching frequency which results in minimum power loss is adopted to improve the efficiency. The relationship between switching frequency and power loss is formulated over a wide load range. Indicated by this kind of relationship, the proposed controller adjusts the switching frequency at different load currents. Moreover, an adaptive gain adjustment controller is applied to replace the traditional controller, with the aim to improve the dynamic performance which is influenced by the changes of the switching frequency and load current. In addition, the experimental results show that the maximum improvement of efficiency is up to 20%. These results confirm the effectiveness of the proposed load adaptive control method.

Keywords: adaptive controller; loss analysis model; optimum switching frequency; variable frequency; wide load range (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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