On electronic saturation influence on chaos in a PWM inverter

The PWM H-Bridge is an industrial converter widely used in motor drives. Usually corrector parameters are tuned to avoid non-periodic running modes but non-periodic behaviors may take place under unexpected situations. In this paper we show how a detailed model of the modulation function may lead to significant differences in chaotic running mode. The shape of the saturation knee of electronic amplifier may lead to self similarity property in the Feigenbaum´s diagram of current whereas digital saturation removes most of bifurcations. This study shows that non-linear dynamics of a converter depend greatly on details related to modulator technology.