Steady-state analysis of the symmetrical push-pull power converter employing a matrix transformer

Data published for the symmetrical push-pull power converter (SPPPC) show that the matrix transformer and the cross-coupling capacitors in this buck-type topology introduce unusual waveforms and properties. Circuit operation is examined in order to seek a simplified explanation of the published observations. Steady-state performance is analyzed and design equations are developed using state-space averaging. It is found that the SPPPC is equivalent to the conventional push-pull converter with an input filter as far as steady-state behavior and voltage/current ripple are concerned. Despite the presence of the cross-coupling capacitors, the currents in the primary windings in series with the same switch are identical. The RMS current in the primary windings of the SPPPC is lower than that in the conventional push-pull converter.>