DB
ELETTRONICA TELECOMUNICAZIONI S.p.A.
KCL 30 SY
- FM broadcasting exciter/transmitter - U
SER
’
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M
ANUAL
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6.
POWER SUPPLY BOARD
6.1
GENERAL DESCRIPTION
The KCL 30 SY power supply is composed of the following elements:
•
1 switching module (Fig. 6.1) capable of
±
12 VDC (6A max) and +24 VDC (10A max) to
power supply the Protection and frontal boards, Sintel GHz modulator board, Amplifier board and
all optional boards present .
•
1 toroidal transformer
WARNING:
before substituting one or more broken switching module it is necessary to disconnect
its output and to set the output voltage, without any load, at the right value (22.5v
±
2%) before
reconnecting the switching module output to the other circuits and boards in order to avoid
overvoltage problems.
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 eve n in case
of wide main fluctuations (
±
15 %).
