Controlling Transformer Magnetizing Offset Current in Isolated Phase-Shift Full-Bridge Converters Using a Luenberger Observer

Figure 2

Schematic characteristics of transformer of PSFB with a present flux imbalance. (a) shows the applied primary voltage . (b) explains the according primary current as overlap between magnetizing current and main primary side current . (c) shows the course of magnetizing current . The small asymmetrical voltage-second product in (a) causes a DC-offset and its absolute value increases each period till transformer saturation.