Controlled Rectifiers

Controlled Rectifiers are rectifiers which have thyristors in place of a diode.  A thyristor is a three terminal device which can be switched on by applying a suitable gate voltage.  Controlled Bridge Rectifier

In a Controlled Rectifier, generally two of the diodes are replaced with a thyristor.  The thyristor enables the enables switching on the output of the rectifier at the desired time.  This allows the output voltage and current to be controlled.

A rectifier with two thyristors is called a half controlled rectifier while a rectifier where all the diodes have been replaced with thyristors is called a fully controlled rectifier.

Controlled Rectifiers are also known as converters.