Dc Module; Figure 12.4 Pmu Dc Module Block Diagram - Tait TB8100 Service Manual

System Interface
and Fan Control
Interface to DC
Module
12.3

DC Module

Figure 12.4 PMU DC module block diagram
DC I/P
EMC Filter
12/24/48V
and
Protection
Battery
Control
*optional
208 Power Management Unit Circuit Description
The system interface circuitry consists of the I
outputs, which are fed to the system control bus connector on the front
panel. There is high frequency filtering on all lines.
The microprocessor also monitors the current drawn by the PMU fan and
protects it from overload or short circuit.
This interface consists of the connectors which connect the AC module to
the DC module. Although there is no circuitry involved this interface, it is
included in the block diagram to illustrate the interconnection between the
AC and DC modules.
The DC module accepts an input of 12VDC, 24VDC or 48VDC nominal,
and provides two regulated 28VDC outputs: high current for the PA, and
low current for the reciter.
The main circuit blocks are shown in
in more detail in the paragraphs which follow.
DC Power
Converter
(DCDC)
DC Control
Standby
Power
Supply
2
C lines, fan power, and alarm
Figure 12.4 below, and are described
Interface to
AC Module
Auxiliary
13.65/27.3/54.6V
Power
Supply*
TB8100 Service Manual
© Tait Electronics Limited September 2006
Control &
Monitor
DC
DC O/P