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

Figure 3

CMC compensation principle of PSFB with a present flux imbalance at transformer. (a) shows the primary voltage , (b) the input current and (c) the magnetizing current of transformer as function of time. Reduced voltage in power cycle reduces and results in an increasing negative DC-offset . CMC extends until matches with and provides a symmetrical voltage-second product.