Modulação de potência por ciclos inteiros: técnicas de atenuação de flicker

Abstract

Currently the non-linear power modulation techniques applied to resistive water heating, mainly on not properly designed electric installations, can generate various problems in the environment where they are present. This is the case of electronic showers that depending on the power modulation technique may result in undesirable effects in the power grid and environment. A typical example is the zero-crossing AC power control, focus of this work, which has low probability of generating harmonics and electromagnetic interference (EMI). On the other hand, it is almost inevitable the emergence of Flicker on the power grid resulting from its use, mainly due to high electrical power consumed by heating equipment, compounded by long conducting and non-conducting power intervals. Whereas the flicker generated is the main drawback from the zero-crossing power control, this work aims to propose other techniques to reduce this undesirable effect allowing several output power levels.