Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title An Analysis of ZVS Phase-Shift Full-Bridge Converter’s Small Signal Model according to Digital Sampling Method
Authors Jeong-Woo Kim ; Younghoon Cho ; Gyu-Ha Choe
DOI 10.6113/TKPE/2015.20.2.167
Page pp.167-174
ISSN 1229-2214
Keywords ZVS(Zero Voltage Switching); DPWM(Digital Pulse-Width Modulator); ZVS PSFB(Zero Voltage Switching Phase-Shift Full Bridge)
Abstract This study describes how digital time delay deteriorates control performance in zero voltage switching (ZVS) phase-shifted full bridge (PSFB) converter. The small-signal model of the ZVS PSFB converter is derived from the buck-converter small-signal model. Digital time delay effects have been considered according to the digital sampling methods. The analysis verifies that digital time delays reduce the stability margin of the converter, and the double sampling technique exhibits better performance than the single sampling technique. Both simulation and experimental results based on 250 W ZVS PSFB confirm the validity of the analyses performed in the study.