Manual Part 7

PSU AC
Outpu t filter (EMC filter)
Con trol and supervision circu its
4.1 Input Filter
The incoming sine voltage first passes through an internal fuse a nd then the
input filter, w here it is filtered to preven t unwanted signals from being radiated
from the PSU AC.
4.2 Bridge
The bri dge rectifies th e incoming AC.
4.3 Boost Converter
The boost converter draws a sinu soidal input current in phase with the input
voltage, enabling the power supply t o have a high power factor and low
distr ibution on input curren t. The output from the boost converter is 400 V DC.
4.4 DC/DC Co nverter
The DC/DC Conve rter is a phase-shifted, soft-switched, full-bridge converter
that converts the incoming 400 V AC to 24 V DC output voltage.
The output provides constant power regulation, rather than t he mor e commo n
curren t limited regulation, and del ivers 1200 W over the whole output range
from 22 29 V DC.
4.5 Output Filter
The output voltage is filte re d to prevent u nwanted signals from being radiated
from the PSU AC.
5 Interf aces
5.1 Signal and Power Interfaces
Input Data
The input data for the PSU AC is shown in the tab le below.
4 (6)
E
N/LZT 720 0249 Uen R2A