Honeywell
COMPONENT MAINTENANCE MANUAL
PART NUMBER 964-0452
1I.B.1516A Page 44
Mar 30/01
23-12-01
states in the power supply. In addition, the Regulator Board, A41, forms the in-
terface between Power Supply, A4, and Controller Voice, A8, via the bidirection-
al module data bus. Ref. Fig. 22 for block diagram.
2
Rectifiers and series regulators
The 3 phases of secondary winding 1 are connected to diodes, V39, V31, V30,
V40, V47, and V29, which are wired as 3-phase bridge-connected rectifiers, via
connections, X52, X53, and X54. A direct voltage of approximately –20V is gen-
erated at C33. From this, integrated fixed-voltage regulator, N4, generates the
–15V output voltage, and at the same time, limits the output current to 0.5A.
The 3 phases of secondary winding 2 are wired via connections, X55, X56, and
X57, to diodes, V43, V44, V42, V13, V45, and V46, thus generating a direct volt-
age of about +29V at C23.
From this, a direct voltage with the signal name +28V is generated with a volt-
age drop of only about 2V, which supplies the driver stage in Power Amplifier
Module, A3.
As a result of the voltage drop at R24 when current flows, V18, already lightly
biased via R23, gradually becomes conductive with an output current of about
2A, and reduces the gate-source voltage of V16, preventing a further current in-
crease. In the event of a short circuit, output current is limited to below 1.5A. R32
and C4 generate a direct voltage almost without residual ripple from the voltage
at C23, whereby the residual ripple at the +28V output is below 100mV.
To generate the CPLPS supply voltage for the Antenna Coupler, the voltage at
C23 is applied via shunt, R21, to transistor, V15. Under normal conditions, this
is fully through-connected via V17 and R22, and about +28V is present at
CPLPS. In the event of overcurrent, transistor, V36, gradually becomes conduc-
tive as a result of the voltage drop, and limits the gate-source voltage of V15,
resulting in a short circuit current of about 7A.
The 3 phases of secondary winding 3 are wired to rectifier diodes, V34, V35,
V23, V33, V38, and V37, via connections, X58, X59, and X60, thus generating
a direct voltage of about +18V at C31.
From this, integrated voltage regulator, N2, generates a regulated output volt-
age of +15V at output, +15V, together with P-channel series transistor, V12. Re-
sistor, R76, provides the voltage regulator with a base load, which acts together
with compensating capacitor, C32, and Zener diode, V72, to prevent hunting.
The 3 phases of secondary winding 4 are wired to rectifier diodes, V48, V26,
V27, V10, V49, and V11, via connections X61, X62, and X63, thus generating a
direct voltage of about +10V at C20.
From this, integrated voltage regulator, N1, creates a regulated output voltage
of +5.3V together with series transistor, V19, which is designated by the signal
name +5V. From this, the output voltage, +5VA, is derived via a choke, providing
protection against pulse spikes for supplying particularly critical circuit compo-
nents in Receiver/Exciter, A1.
VoLtage regulator, N1, obtains its supply voLtage from the auxiliary voltage,
AV12. The reference voltage is derived via voltage divider, R23 and R19, and
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