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National Engineering School of Sousse ENISO
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.pdf   1452967671-Cour2redressementtriphase2.pdf (Size: 561.43 KB / Downloads: 3)


Introduction:

The rectifier circuits, often called simply rectifiers are
power electronics converters that provide direct conversion
continuous alternative. Powered by a single-phase AC voltage source or
multiphase, they can continuously supply the current receiver connected to their
exit.
A rectifier is used whenever there is a need to continuously while energy
AC power is available. As it is in this second form
electrical energy is almost always generated and distributed, the rectifiers have a
very wide range of applications.
The diode rectifiers, or uncontrolled rectifiers, do not allow to
vary the ratio or the input AC voltages and the DC voltage
Release. In addition, they are irreversible, that is to say that the power can only go
the AC side to the DC side.


The three types of rectifier circuits:


To obtain a DC voltage, is straightened a set of q voltages
alternatives, usually assumed sinusoidal and forming a multiphase system
balanced (number of phases
q). These voltages may be the terminal voltages
an alternator. Generally, they are provided by the single-phase network or,
more often, by the three-phase network, usually via a
transformer.
There are three types of mounts:
1. Pq: assemblies with source star and a single switch or rectifier
"Half-wave";
2. PDQ: assemblies with source star and two switches or rectifiers "in
bridge";
3. Sq: assemblies with source polygon and two switches or rectifiers "in
bridge "with polygonal source (Sq-type fixtures will not be
studied in this course).



Some definitions:


q switching Index assembly:
The switching index is given by the conduction time of each diode and
is the number of phases of the distribution network. For example, for
mounting P3 and PD3, the switching index is equal to 3 (each diode conducts
during a third period or T / q).
p-pulse of the rectified voltage:
The per-pulse gives the number of sine wave portions by the period
rectified voltage. For example, for the PD3 mounting, we see that the index
pulsation is equal to 6 (the rectified voltage consists of six portions per period).
Form Factor:
The value of the form factor characterizes the rectified voltage. The higher the value
close to unity, the higher the voltage obtained is adjacent to a continuous magnitude.
This ratio is used to compare different rectifier circuits between them. By
definition, form factor called the report:
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