Ecler DT4800, Service Manual

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52-0023-0100 EP05-02 Font Conmutada (Anglès).doc 1 of 2
POWER SUPPLY.
All of the explanations written in this document will be based on the schematics
shown on Figure 1. As it is not intended to generate a deep and precise description of its
performance, due to the complexity of the circuitry, this document will explain briefly the
basic principles on which this circuitry is based.
Figure 1
AC INPUT EMC FILTER.
The first element found is a mains supply filter, made of a double- π structure. This is
intended to avoid RF signal leakage (EMC) from the unit to other equipment, connected to
a common mains supply. The use of this kind of filters is quite usual in order to accomplish
European CE-label recommendations. It is a classical filter type, including two toroidal
cores, and both X- and Y-type capacitors.
author:
J. Colomines
date:
040308
project:
EP05-02
product:
DT6800/4800
ECLER
approved:
num:
52..0023
version:
01.00
title:
FUNCTIONING DESCRIPTION
AC INPUT
EMC FILTER
PFC +
RECTIFIER
FILTER
RESONANT
HALF BRIDGE
OUTPUT
TRANSFORMER
PFC
CONTROL
POWER
SUPPLY
CONTROL
AUXILIAR
POWER
SUPPLY
AC MAINS
INPUT
OUTPUT FILTER
AND
RECTIFIER
Vaux+
STEP DOWN
Vaux -
REGULATOR
FAN
REGULATOR
FAN
AMP MODUL
E