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

Figure 12

Experimental results of PSFB prototype in steady state operating point. (a) shows the primary current without ctr_Ih. The resulting asymmetrical course of leads to a negative offset . In (b) ctr_Ih compensates the offset and ensures a symmetrical course of magnetizing current. (c) explains the courses of primary currents in detail and illustrates the offset difference .