A Simple Switching Control Technique for Improving Light Load Efficiency in a Phase-Shifted Full-Bridge Converter with a Server Power System

In phase-shifted full-bridge (PSFB) converter, using discontinuous conduction mode (DCM) is one of the most effective ways to improve efficiency in the light load condition. DCM of the PSFB converter allows getting reduced the duty ratio and zero voltage switching (ZVS) in the light load condition....

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Bibliographic Details
Published in:IEEE transactions on power electronics 2014-04, Vol.29 (4), p.1562-1566
Main Authors: KIM, Jong-Woo, KIM, Duk-You, KIM, Chong-Eun, MOON, Gun-Woo
Format: Article
Language:English
Subjects:
Applied sciences
Conductivity
Convertors
Diodes
Electric currents
Electrical engineering. Electrical power engineering
Electrical machines
Electrical power engineering
Electronics
Exact sciences and technology
Inductors
Light load efficiency
Miscellaneous
Modulation
phase-shifted full-bridge converter (PSFB)
Power electronics, power supplies
Power networks and lines
Power supply
Power systems
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Servers
Switches
Switching
synchronous rectifier (SR) control
Zero voltage switching
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Summary:In phase-shifted full-bridge (PSFB) converter, using discontinuous conduction mode (DCM) is one of the most effective ways to improve efficiency in the light load condition. DCM of the PSFB converter allows getting reduced the duty ratio and zero voltage switching (ZVS) in the light load condition. Because of its simplicity, commercial IC adapted DCM by turning-off synchronous rectifiers (SRs). However, turning-off SRs causes large conduction losses in body diodes of SRs, and ZVS condition or optimized dead time are not defined yet. This letter proposes to use "AND-gated" control signals for SRs to reduce conduction losses in body diodes. Also, the ZVS condition is presented to design dead time easily. The feasibility of the proposed technique has been verified with 90-265 V ac input, 400 V link voltage, and 12V/750 W output server computer power supply system.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2013.2279549