Salicru DC POWER-L Series, Manual

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SALICRU

5.  Rectifier block diagram 

and description.

5.1.  Structural block diagram.

AC

 in

pu

t

Input 

filter

Input 

transformer

Non-return 

diode

Battery

Communications

Control / 

Display

DC

ou

tp

ut

AC / DC converter 

(Rectifier)

Output 

filter

LC filter

Battery protection

Rectifier 

output prot.

Output 

switch

Input prot. 

switch

Fig. 4. 

Block diagram.

5.2.  Description.

The 

DC Power-L 12-pulse 

family of rectifiers has been designed 

to offer a variety of fully configurable output voltages ranging 
from 24Vdc to 220Vdc and currents up to 800A.
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.

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 reinjec-
tion 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.  Jumper rectifier.

Formed by six thyristors in full-wave three-phase jumper struc-
ture in six-pulse devices or double in 12-pulse devices.
In single-phase devices the jumper 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.