What does a 3-phase rectifier do?

A 3-phase rectifier is designed to convert alternating current (AC) to direct current (DC) using diodes. In this process, the rectifier takes advantage of the three-phase AC supply, which consists of three alternating currents that are offset in time. The diodes within the rectifier allow only one direction of current to pass through, effectively converting the bidirectional AC into unidirectional DC.

The efficiency of the 3-phase rectifier is greater than that of single-phase rectifiers due to its ability to utilize three separate phases of AC. This results in a smoother and more constant DC output, as the rectification process creates a ripple that is lower in magnitude with three phases compared to one.

The other options do not accurately reflect the function of a 3-phase rectifier. The device does not convert DC to AC, filter high voltage power, or stabilize voltage levels; rather, its primary role is to facilitate the conversion of AC power into a usable DC form.