DB
ELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - U
SER
’
S
M
ANUAL
32 /101
5.
POWER SUPPLY STAGE
5.1
GENERAL DESCRIPTION
The PM1000 transmitter power supply is composed of the following elements:
•
1 mains switching board delivering 45V/60A in continuous operation. This module gives the
correct voltage to supply the MOSFET power amplifiers (DB 9812_001).
•
2 switching modules capable of
±
12 VDC (6A max) and +24 VDC (10A max) to power supply
the Protection and control boards, meter stage, Sintel ’96 modulator board, AMP30 Driver stage
and all optional boards present.
The switching-mode power supply provides:
1.
the efficiency is 80% higher hence provides a considerable reduction of the internal heating, thus
simplifying the cooling system;
2.
a
lower thermal and mechanical stress for associated components, such as transformer, diodes,
rectifier bridges is inflicted;
3.
the power supply voltages at the output of the switching regulators are constant even in case of
wide main fluctuations (
±
15 %).
Summary of Contents for PM 1000
Page 6: ......
