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Circuit Descriptions, List of Abbreviations, and IC Data Sheets
Table 9-1 I/O Overview Power Supply
Name
I/O
+3V3
Out
+3V3_STBY_SW
Out
+5V
Out
+5V_STBY_SW
Out
+8V6
Out
+9V_STBY
Out
+9V_STBY_SW
Out
DC_PROT
In
FAN_SP_1
In
FAN_SP_2
In
FAN_SUPPLY_1
Out
FAN_SUPPLY_2
Out
I_ak
Out
Mains
In
110/240 V_ac, 50/60 Hz Mains voltage.
POWER_OK
Out
SCL_1
In
SDA_1
In/
Out
STANDBY
In
V_a
Out
V_ak
Out
V_cc
Out
V_cego
In
H/L (H= +2 V_dc)
V_ra
In
V_rs
In
V_s
Out
V_sago
In
H/L (H= +2 V_dc)
V_sk
Out
V_SND_POS
Out
V_SND_NEG
Out
The Power Supply Unit (PSU) is designed to provide regulated
output voltages for the plasma display panel (PDP) and the
built-in electronic panels (such as e.g. the SCAVIO and Audio
Amplifier panels).
It houses the Pre-conditioner, DC/DC converters and the
Standby circuitry. In addition, this panel will house the
protection and the (optional) fan drive circuitry.
The mains inlet is mounted alongside the SCAVIO panel. It
consists of the necessary high and low frequency mains filters.
The mains AC voltage is applied to the input filter and then fed
to the standby supply. This supply is always operational and
delivers the +9V_STBY voltage.
The task of the main supply is to deliver the supply voltages for
the several electrical circuits in the plasma monitor.
It is switched via two single-pole relays, which are powered
from the +9V_STBY voltage and controlled via the
SUPPLY_ON signal.
The reason to choose for a separate standby supply instead of
a single flyback supply is the requirement to have a low standby
power consumption.
The PSU consists of the following parts (which are described
separately):
•
Mains inlet and filter.
•
Standby supply.
•
Fan control (optional).
•
Pre-conditioner.
•
LLC supply.
•
Aux. supply.
•
Protections.
Value
Description
+3.3 V_dc
To supply small signal digital circuitry.
+3.3 V_dc
To supply small signal digital circuitry, needing power in standby
+5 V_dc
To supply small signal digital circuitry.
+5 V_dc
To supply small signal digital circuitry, needing power in standby
+8.6 V_dc
To supply the small signal analogue circuitry.
+9 V_dc
Signal to functional ON/OFF switch.
+9 V_dc
Signal from functional ON/OFF switch.
H/L
Signal from audio amplifier to switch OFF the power supply in case of a safety problem.
H/L (TTL level)
PWM signal from uP to control optional fans (group 1).
H/L (TTL level)
PWM signal from uP to control optional fans (group 2). Not for FM33.
5 to 13 V_dc
Supply voltage for optional fans (group 1).
5 to 13 V_dc
Supply voltage for optional fans (group 2). Not for FM33.
Signal to measure 'I_a' in PDP (I_ak= 1 x I_a).
H/L (TTL level)
Signal to an interrupt pin of the uP, which indicates that the power supply is in regulation.
If an error occurs, signal goes from H to L.
H/L
I2C clock line from uP.
H/L
Bi-directional I2C data line from/to uP.
H/L (TTL level)
Signal to switch the PSU to standby mode.
+30 to +70 V_dc
To supply the addressing circuitry in the PDP.
Signal to measure Va in PDP (V_sk= 0.036 x V_a).
+5 V_dc
To supply small signal digital circuitry in the PDP.
Signal to switch the low voltage supplies ON/OFF.
Signal to control Va (V_a= 30 + (20 x V_ra)).
Signal to control Vs (V_s= 70 + (10 x V_rs)).
+70 to +90 V_dc
To supply the sustain circuitry in the PDP.
Signal to switch the high voltage supplies (V_s and V_a) ON/OFF.
Signal to measure V_s in PDP (V_sk= 0.029 x V_s).
+14.5 V_dc
To supply the audio amplifier panel.
-14.5 V_dc
To supply the audio amplifier panel.
FM23, FM24, FM33
Notes:
•
To understand the descriptions below, see also the
diagrams in Chapter 7.
•
The descriptions are valid for the whole FM-range (FM23,
FM24, and FM33). Where there are deviations, this will be
highlighted per chassis.
9.2.2
Mains Inlet and Filter (Diagram P2)
Introduction
The mains filter provides common-mode and differential-mode
filtering, to fulfil legal and self-imposed limits. Additional
provisions are mains spikes and lightning protection.
Operation
The mains voltage is provided via mains inlet 0308, after which
it is fused by a T6.3A fuse (item 1400).
The next part, the mains filter, is optional. It consists of an LC
common mode filter section. This filter consists of two
capacitors (items 2402 and 2403) from both phase and neutral
to ground (to reduce the leakage current) and an inductor
(5401). Interferences on one of the phases are shorted to
ground via these capacitors.
Inductor 5401 also provides a differential-mode filtering with
capacitor 2400. Resistor 3401 discharges this capacitor after
the mains is disconnected.
A second common mode filter is made around coil 5402 and
capacitor 2401. A third filter is made around coil 5404 and
capacitor 2412 (only for the FM24 and FM33).
Resistor 3400 is a high energy VDR. The advantage of this
VDR is that it can handle 400 V_ac without risk of fire. At high
voltage peaks (e.g. lightning surge) on one of the phases, the
9.
EN 129
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