A novel method of phase-shifted full-bridge converter to improve efficiency under light load condition

The main theme of this paper is to propose a novel peak current mode control method to reduce the loss of phase-shifted full-bridge (PSFB) converter under light load condition. The proposed control method can adjust the switching frequency of the converter to keep the on-time of switches fixed. Acco...

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Bibliographic Details
Main Authors: Zhao, Lei, Li, Haoyu, Yu, Yanxue, Wang, Yutian
Format: Conference Proceeding
Language:English
Subjects:
Conferences
Control systems
Converters
Dynamical systems
Dynamics
efficiency improvement
Electric power generation
Electronics
Inductors
light load
Magnetic cores
peak current
phase-shifted full-bridge
Rectifiers
Switches
Switching
Switching frequency
Switching loss
Zero voltage switching
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Summary:The main theme of this paper is to propose a novel peak current mode control method to reduce the loss of phase-shifted full-bridge (PSFB) converter under light load condition. The proposed control method can adjust the switching frequency of the converter to keep the on-time of switches fixed. According to the loss analysis model in discontinuous current mode operation, the switching frequency is proportional to load current and the efficiency is independent from the load. Moreover, the small signal model of the PSFB converter with the proposed control method is presented. A digital-controlled experimental system is set up. The proposed method is investigated and confirmed by experimental results. Experimental results show that the efficiency and dynamic performance can be improved. These results confirm the effectiveness of the proposed control method.
ISSN:2150-6078
2150-6086
DOI:10.1109/ICPE.2015.7168195