Step by Step Turning Procedure for Optimizing ZVS Phase-shifted Full-bridge Converter

摘要

High power density and high efficiency become essential design needs of switching mode power supplies.Zero-voltage-switching (ZVS) phase-shift full-bridge converter can easily increase power density,but without providing extra switching losses at MOSFETs turning on to satisfy the design needs. This paper presents the fine turning procedures in step by step approach to optimize ZVS phase-shift fullbridge converter using Infineon latest technologies MOSFET with integrated fast body diode for achieving the highest efficiency.All the possible adjustments of the converter such as delay times of primary side MOSFETs,resonant inductance value,and variances of primary side MOSFET driving resistance,RG,ext will be explained in detail.Since ZVS phase-shift full-bridge converter is already maturated, the mathematical calculation for design equations will be omitted for briefly in this paper.However, the main focus on this paper is putting on waveforms analyses by “real measurement” to illustrate each effect of fine turning steps.Finally a turning procedure of ZVS phase-shift full-bridge converter flowchart will be showed.