Ecler DT4800, Руководство по обслуживанию

Страница: 7 / 68

52-0024-0100 EP05-02 Mòdul (Anglès).doc 1 of 4
POWER CIRCUITRY.
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
INPUT STAGES.
Our usual balanced input stage is used, with a stacking output split, a low-pass filter
to avoid RF-noise humming on input signals, and a sub-sonic cut-off filter, internally ON-
OFF switchable, which allows to reject signals below the 20Hz constant cut off frequency.
author:
J. Colomines
date:
040312
project:
EP05-02
product:
DT6800/4800
ECLER
approved:
num:
52.0024
version:
01.00
title:
FUNCTIONING DESCRIPTION
CURRENT
FEEDBACK
VOLTAGE
FEEDBACK
OUT+
CURRENT
FEEDBACK
+Vcc
ZOBEL
EMI
FILTER
TRIANGULAR
GENERATOR
MUTE
OUT+
OUT-
SIGNAL
PRESENT
INPUT
STACK
OUT
20Hz
FILTER
LOW PASS
FILTER
CURRENT
SENSE
CURRENT
FEEDBACK
PWM
CONTROL
THERMAL
PROBE
FAN
CONTROL
-Vref
+Vref
THERMAL
-Vref
VOL.
-Vref
CLIP
HIGH
FREQUENCY
FILTER
-Vref
OVER
ANTIALIASING
FILTER
CURRENT
SENSE
DETECTOR
R
R
+Vref
STANDBY
CIRCUIT
SUBSONIC
BANDPASS
PWM
CONTROL
DISABLE
MUTE
STANDBY
DISABLE DISABLE
AC LOSS
CIRCUIT
+Vref -Vref
DC OUT
adj.
ANTICLIP
CIRCUIT
FROM POWER
SUPPLY
OUT -
FEEDBACK
CIRCUIT
PULSE
CORRECTION
CIRCUIT
OSC.
COMMON
MODE
FILTER
DIFFERENTIAL
FILTER
DC OUT
CIRCUIT
ZOBEL PROTECTION
CIRCUIT
OUTPUT
CURRENT
LIMITER
PULSE
CORRECTION
CIRCUIT