Block Diagram; Bridge Rectifier - Salicru DC POWER-L Series User Manual

5. Rectifier block diagram
and description.
5.1.

Block diagram.

Input Input prot.
filter switch
Control /
Display
Communications
Fig. 12. Block diagram.
5.2. Description.
The DC Power-L family of rectifiers has been designed to offer a
variety of fully configurable output voltages ranging from 24 Vdc
to 220 Vdc and currents up to 800 A.
The DC Power-L is a low-frequency full-wave thyristor-controlled
rectifier that converts AC input voltage into stabilised DC voltage.
The DC Power-L rectifier cabinet is built with all of the necessary
elements around the central core of the system.
5.2.1. General.
As thyristor-controlled rectification is a technology of great ro-
bustness and reliability, we have opted for a system with natural
cooling, thus reducing the need to replace components prone to
ageing such as fans and creating a system with superior reliability.
The main function of the system is to supply the output load and,
at the same time, keep the system's backup battery charged and
in optimum condition so that it can supply power to the load in the
event of input mains failure or output overloads.
5.2.2. AC input.
For greater versatility, the system can be either single-phase or
three-phase.
Regardless of the topology of the mains, protection elements are
installed against voltage peaks that could come from the mains.
20
Input AC / DC converter
transformer (Rectifier)
Battery
LC filter Non-return
diode output prot.
Batteries prot.
5.2.3. Input filter.
The system includes all necessary filters to ensure compliance
with the electromagnetic compatibility standards required for CE
marking. Being a thyristor-controlled rectification system that
generates high input mains distortion, it is possible to have a
device-integrated harmonic filter at the input to reduce reinjection
to levels below 10%.
5.2.4. Transformer.
The system is equipped with a low-frequency input transformer
through which an isolated voltage is obtained. This voltage is
chosen according to the desired output voltage and is the one
that is rectified by the thyristors to obtain the stabilised direct
voltage.

5.2.5. Bridge rectifier.

Formed by six thyristors in full-wave three-phase bridge structure
in six-pulse devices.
In single-phase devices the bridge consists of four elements. It is
a highly robust low-frequency rectification structure and the part
responsible for rectifying the output voltage to the desired value.
It is equipped with RC networks for protection against transients
and a temperature monitoring system for alarm and shutdown of
the system as self-protection for the device.
Rectifier Output Output
switch filter
USER MANUAL