Transformerless power line voltage conditioner and regulator based on CA PWM Chopper

Utility power quality problems like input voltage unbalance and sag conditions severely stress electronic equipment. Voltage sag forecasting is a complex issue, since it involves a large variety of random factors, such as: type of shortcircuits in the power system, location of faults, protective system performance and atmospheric discharges. Recently, the AC-AC converters have been proposed as voltage compensator. In this paper a patented topology is proposed and checked; its main advantage is that in addition to compensate voltage sags or swells by changing the duty ratio, it may be used as a line dimmer for lighting loads.