GPT description and maintenance
57
857-164688 / E
GPT Power supply
Purpose and description
The GPT power module generates all internal voltages needed
by the GPT transceiver. The power module consists of a printed
circuit board with front plate and an external DC-DC switching
converter. The converter (Vicor VI-272-EW) is mounted
directly on the inner wall of the GPT cabinet using the cabinet
as heat sink.
Figure 22 Vicor converter
-IN
+IN
GATE OUT
-OUT
+OUT
GATE IN
-S
+S
VI-272-EW
T
P2 (2)
P2 (3)
P2 (4)
243 k
Ω
P2 (1)
(Cd6737)
A four-wire cable connects the external converter with
connector P2 on the printed circuit board.
The power module converts the 115-230 VAC mains to a
approximately 12 VDC which is available via a connector at the
front plate. All other voltages are generated from this internal 12
VDC. Consequently, the GPT can also be powered from a
standard 12 V car battery. A UPS (Uninterrupted Power Supply)
arrangement is realised by operating the GPT from the 115-230
VAC mains with a car battery connected. The power module can
also be used as a 7 A battery charger. The remote ON/OFF input
signal switches the internal 12 VDC on/off. The remote
ON/OFF circuit also implements undervoltage protection.
The mains converter section consists of mains noise filter,
bridge rectifier, hold-up capacitor, DC-DC switching converter
and a protection power diode. The mains noise filter is mounted
at the front plate.
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