GUEST EDITORIAL.

The article focuses on power electronics. Today high-demanding requests on the switching supplies have to be addressed by researchers: the need of high power density supplies for miniaturization purpose, fast transient response to rapidly changing loads like computers, absorption of clean sinusoidal currents from the electrical network for avoiding its harmonic pollution, supply of low voltages at high currents and steep voltage step-up, as required by telecommunication consumers. Neimark Sacker bifurcation is influenced by interleaving parallel-connected converters.