dB PM 1000 - Power Supply Stage

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL
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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 %).