Premo offers combined magnetics solutions which integrate the resonant choke Lr, the parallel inductor Lp and the transformer. For example, an integrated magnetics solution can include two transformers and the resonant series inductor Lr split into two identical symmetrical parts at the beginning and the end of each primary winding. Figure 7 shows a real example with 2 x 11kW transformers with 2x7.5µH Lr chokes.
Integrated magnetics use the common magnetic circuit of a transformer, a series resonant choke and the flux cancellation to increase power density and save cores.
As the power demand increases and EMI issues become more critical, the advantages of resonant converters with integrated magnetics are their soft switching of transistors that provide a higher operating frequency and open the door to GaN-transistors based sinusoidal power processing.
About the author:
Abdelkader Birch is R&D engineer at Premo – www.grupopremo.com