What is a Rectifier?

A rectifier is an electrical device used to convert alternating current (AC) into direct current (DC) by allowing a current to flow through the device in one direction only. Diodes work like one-way valves within the rectifier to maintain this flow of current. This process is generally known as “rectification.”

While rectifiers have many uses, they are most often used as the primary components of DC power supplies and high-voltage direct current transmission systems. In an industrial setting, rectifiers are typically spec’d based on voltage applied, current needed in the process, quality of the power, and how the control will be arranged.

Ripple is an important measurement for determining the efficiency and quality of a rectifier. Ripple is the clarity of the power (how clean it is) expressed in a percentage. AC divided by DC equals the percent of ripple.