An Interleaved Phase-Shift Full-Bridge Converter with Dynamic Dead Time Control for Server Power Applications

Jia-You Lee, Jheng-Hung Chen and Kuo-Yuan Lo
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Jia-You Lee: Department of Electrical Engineering, National Cheng Kung University, Tainan 701, Taiwan
Jheng-Hung Chen: Department of Electrical Engineering, National Cheng Kung University, Tainan 701, Taiwan
Kuo-Yuan Lo: Department of Electrical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807, Taiwan

Energies, 2021, vol. 14, issue 4, 1-15

Abstract: A compact and high-efficiency power converter is the main business of today’s power industry for server power applications. To achieve high efficiency with a low-output ripple, an interleaved phase-shift full-bridge (PSFB) converter is designed, built, and tested for server power applications in this study. In this paper, dynamic dead time control is proposed to reduce the switching loss in the light load condition. The proposed technique reduces the turn-off switching loss and allows a wide range of zero-voltage switching. Moreover, the current ripple of the output inductor can be reduced with the interleaved operation. To verify the theoretical analysis, the proposed PSFB converter is simulated, and a 3 kW prototype is constructed. The experimental results confirm that the conversion efficiency is as high as 97.2% at the rated power of 3 kW and 92.95% at the light load of 300 W. The experimental transient waveforms demonstrated that the voltage spike or drop is less than 2 V in the fast-fluctuating load conditions from 0% load to 60% load and 40% load to 100% load.

Keywords: phase-shift full-bridge converter; dynamic dead time; interleaving operation (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: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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