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Title: Load-Dependent Soft-Switching Method of Half-Bridge Current Doubler for High-Voltage Point-of-Load Converter in Data Center Power Supplies

With the increased cloud computing and digital information storage, the energy requirement of data centers keeps increasing. A high-voltage point of load (HV POL) with an input series output parallel structure is proposed to convert 400 to 1 VDC within a single stage to increase the power conversion efficiency. The symmetrical controlled half-bridge current doubler is selected as the converter topology in the HV POL. A load-dependent soft-switching method has been proposed with an auxiliary circuit that includes inductor, diode, and MOSFETs so that the hard-switching issue of typical symmetrical controlled half-bridge converters is resolved. The operation principles of the proposed soft-switching half-bridge current doubler have been analyzed in detail. Then, the necessity of adjusting the timing with the loading in the proposed method is analyzed based on losses, and a controller is designed to realize the load-dependent operation. A lossless RCD current sensing method is used to sense the output inductor current value in the proposed load-dependent operation. In conclusion, experimental efficiency of a hardware prototype is provided to show that the proposed method can increase the converter's efficiency in both heavy- and light-load conditions.
Authors:
 [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Electrical Engineer and Computer Science
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Power Electronics
Additional Journal Information:
Journal Volume: 32; Journal Issue: 4; Journal ID: ISSN 0885-8993
Publisher:
IEEE
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; date center power supplies; half-bridge current doubler; load dependent; zero voltage switching (ZVS)
OSTI Identifier:
1394580

Cui, Yutian, Yang, Fei, Tolbert, Leon M., Costinett, Daniel J., Wang, Fred, and Blalock, Benjamin J.. Load-Dependent Soft-Switching Method of Half-Bridge Current Doubler for High-Voltage Point-of-Load Converter in Data Center Power Supplies. United States: N. p., Web. doi:10.1109/TPEL.2016.2580603.
Cui, Yutian, Yang, Fei, Tolbert, Leon M., Costinett, Daniel J., Wang, Fred, & Blalock, Benjamin J.. Load-Dependent Soft-Switching Method of Half-Bridge Current Doubler for High-Voltage Point-of-Load Converter in Data Center Power Supplies. United States. doi:10.1109/TPEL.2016.2580603.
Cui, Yutian, Yang, Fei, Tolbert, Leon M., Costinett, Daniel J., Wang, Fred, and Blalock, Benjamin J.. 2016. "Load-Dependent Soft-Switching Method of Half-Bridge Current Doubler for High-Voltage Point-of-Load Converter in Data Center Power Supplies". United States. doi:10.1109/TPEL.2016.2580603. https://www.osti.gov/servlets/purl/1394580.
@article{osti_1394580,
title = {Load-Dependent Soft-Switching Method of Half-Bridge Current Doubler for High-Voltage Point-of-Load Converter in Data Center Power Supplies},
author = {Cui, Yutian and Yang, Fei and Tolbert, Leon M. and Costinett, Daniel J. and Wang, Fred and Blalock, Benjamin J.},
abstractNote = {With the increased cloud computing and digital information storage, the energy requirement of data centers keeps increasing. A high-voltage point of load (HV POL) with an input series output parallel structure is proposed to convert 400 to 1 VDC within a single stage to increase the power conversion efficiency. The symmetrical controlled half-bridge current doubler is selected as the converter topology in the HV POL. A load-dependent soft-switching method has been proposed with an auxiliary circuit that includes inductor, diode, and MOSFETs so that the hard-switching issue of typical symmetrical controlled half-bridge converters is resolved. The operation principles of the proposed soft-switching half-bridge current doubler have been analyzed in detail. Then, the necessity of adjusting the timing with the loading in the proposed method is analyzed based on losses, and a controller is designed to realize the load-dependent operation. A lossless RCD current sensing method is used to sense the output inductor current value in the proposed load-dependent operation. In conclusion, experimental efficiency of a hardware prototype is provided to show that the proposed method can increase the converter's efficiency in both heavy- and light-load conditions.},
doi = {10.1109/TPEL.2016.2580603},
journal = {IEEE Transactions on Power Electronics},
number = 4,
volume = 32,
place = {United States},
year = {2016},
month = {6}
}