Two phase interleaved ISOP connected high step down ratio phase shift full bridge DC/DC converter with GaN FETs

Author

Yutian Cui ; Zhang, Weimin ; Tolbert, Leon M. ; Costinett, Daniel J. ; Wang, Fred ; Blalock, Benjamin J.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Univ. of Tennessee, Knoxville, TN, USA

fYear

2015

fDate

15-19 March 2015

Firstpage

1414

Lastpage

1419

Abstract

High voltage DC (400 V) power supply architecture is becoming a standard in today´s data center power supply. To further convert from 400 V to 1 V, usually several power stages are connected in series. Therefore, even if the efficiency of each power stage is high; the overall system efficiency is limited because of the multiplication of each converter´s efficiency. In this paper, a single power stage system which converts 400 V to 1 V directly and performs as the high voltage point of load (HV POL) is proposed. A multi-phase interleaved phase shift pulse width modulation (PWM) DC/DC converter with input series and output parallel (ISOP) connection is selected as the power stage topology. A simplified two phase connected system is discussed in this paper. Common duty cycle control technique is used to control the ISOP connected converters. Input voltage sharing and output current sharing is analyzed with different types of mismatches in the circuit. Finally, the preliminary testing results are given.

Keywords

DC-DC power convertors; III-V semiconductors; PWM power convertors; bridge circuits; electric current control; elemental semiconductors; power field effect transistors; voltage control; common duty cycle control technique; data center power supply; gallium nitride FET; high voltage DC power supply architecture; high voltage point-of-load; input series-and-output parallel connection; input voltage sharing analysis; multiphase interleaved phase shift pulse width modulation DC-DC converter; output current sharing analysis; phase shift full bridge DC-DC converter; power stage topology; single power stage system; two phase interleaved ISOP connected high step down ratio DC-DC converter; voltage 400 V to 1 V; Bridge circuits; Inductance; Inductors; Power supplies; Testing; Voltage control; Windings; GaN FETs; High efficiency; ISOP; phase shift full bridge converter; power supply;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE

Conference_Location

Charlotte, NC

Type

conf

DOI

10.1109/APEC.2015.7104533

Filename

7104533