54 |
P a g e
Single-phase Controlled Rectifier
This type of rectifier which works from single phase AC i/p
power supply
Single Phase Controlled Rectifiers are classified into different types
Half wave Controlled Rectifier:
This type of rectifier uses a single Thyristor device to provide o/p
control only in one
half cycle of input AC supply, and it offers low DC output.
Full wave Controlled Rectifier:
This type of rectifier provides higher DC output
Full wave controlled rectifier with a center tapped transformer requires two Thyristors.
Full wave bridge controlled rectifiers do not need a center tapped transformer
Three-phase Controlled Rectifier
This type of rectifier which works from three phase AC i/p power supply
A semi converter is a one quadrant converter that has one polarity of o/p voltage and current.
A full converter is a a two quadrants converter that has polarity of o/p voltage can be either +ve or
–
ve
but, the current can have only one polarity that is either +ve or -ve.
Dual converter works in four quadrants
–
both o/p voltage and o/p current can have both the polarities.
Operation of Phase Controlled Rectifier
The basic working principle of a PCR circuit is explained using a single phase half wave PCR circuit with
a RL load resistive shown in the following circuit.
A single phase half wave Thyristor converter circuit is used to convert AC to DC power conversion. The
i/p AC supply is attained from a transformer to offer the required AC supply
voltage to the Thyristor
converter based on the o/p DC voltage required. In the above circuit, the
primary and secondary AC
supply voltages are denoted with VP and VS.
