An Enhanced Model for Small-Signal Analysis of the Phase-Shifted Full-Bridge Converter

Author

Di Capua, Giulia ; Shirsavar, Seyed Ali ; Hallworth, Michael Andrew ; Femia, Nicola

Author_Institution

Dept. of Inf. Eng., Electr. Eng. & Appl. Math., Univ. of Salerno, Salerno, Italy

Volume

30

Issue

3

fYear

2015

fDate

Mar-15

Firstpage

1567

Lastpage

1576

Abstract

This paper presents an in-depth critical discussion and derivation of a detailed small-signal analysis of the phase-shifted full-bridge (PSFB) converter. Circuit parasitics, resonant inductance, and transformer turns ratio have all been taken into account in the evaluation of this topology´s open-loop control-to-output, line-to-output, and load-to-output transfer functions. Accordingly, the significant impact of losses and resonant inductance on the converter´s transfer functions is highlighted. The enhanced dynamic model proposed in this paper enables the correct design of the converter compensator, including the effect of parasitics on the dynamic behavior of the PSFB converter. Detailed experimental results for a real-life 36 V-to-14 V/10 A PSFB industrial application show excellent agreement with the predictions from the model proposed herein.

Keywords

power convertors; transfer functions; PSFB converter dynamic behavior; circuit parasitics; converter compensator; current 10 A; enhanced dynamic model; line-to-output transfer function; load-to-output transfer function; open-loop control-to-output transfer function; phase-shifted full-bridge converter; resonant inductance; small-signal analysis; transformer turn ratio; voltage 36 V to 14 V; Analytical models; Equations; Inductance; Integrated circuit modeling; Mathematical model; Pulse width modulation; Transfer functions; Losses-based dynamic modeling; phase-shifted full-bridge (PSFB); small-signal analysis;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2014.2314241

Filename

6780642