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Chapter 1. INTRODUCTION - TM-11-6130-429-400009
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TM-11-6130-429-40 Converter Direct Current CV=3734/T Manual
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Figure 1-2. Simplified Block Diagram
TM 11-6130-429-40
SECTION
Il.
EQUIPMENT
DESCRIPTION
1-9. Equipment Characteristics, Capabilities,
Length
44.45 cm (17.50 in.)
and Features
Width
12.4 cm (4.88 in.)
Height
17.78 cm (7.0 in.)
a. Purpose of Converter:
Environmental
Conditions:
Supplies  regulated  DC  voltage  to  equipment
Ambient
temperature
-70
F(-57C)
to
+125F
used  in  AN/TTC-38(V)  and  AN/TYC-39(V)
(+52C)
Relative
Humidity
98%
t e l e p h o n e switching systems.
Altitude
Up
to
25,000
feet
(7,500
meters)
b. Capabilities and Features:
above sea level
External shutdown capability, from equip
Technical
characteristics
ment or control panel converter supplies.
Output
voltages
+5V
direct
current
Automatic shutdown in the event of overload
+75 amperes
Output current
Nominal power
375
watts
o r underload conditions.
Operating
power
require-
Emergency
voltage
adjustment.
ments
21-30 volts direct current
Test points for monitoring output circuits.
of full load
Regulation-Peak-to-Peak
0 to 10%
Ripple and Noise
10% to full load 2%
1-10. Location and Description of Major
1-12. Safety, Care and Handling
Components
All major components of the converter are located on
Observe all WARNINGS, CAUTIONS, and NOTES
the front and rear panels, and inside the main chassis
i n this manual. This equipment can be extremely
assembly.
dangerous if these instructions are not followed.
1-11. Equipment Data
Weight
and
Dimensions:
Rack
Mounted:
Weight
11.350 Kg (25 lbs. approximate)
SECTION
III.
TECHNICAL
PRINCIPLES
OF
OPERATION
1-13. Block Diagram Description
tion between input and output. The output voltage is
m o n i t o r e d by the control circuits which, in turn, ad-
just the pulse width (duty cycle) of the 20 kHz
a. Two connectors (P1 and P2) are provided for
switching regulator automatically so that the output
dual input and output connections. The outputs are
voltage is maintained independent of the input line or
interconnected to the loads through isolation diodes
o u t p u t load conditions.
which enable two or more converters to be used in
c. The input EMI filter prevents electromagnetic
redundancy. If one converter fails, the standby con-
i n t e r f e r e n c e s generated in the switching converter
v e r t e r will automatically take over without voltage
from reaching the input DC line and similarly pre-
i n t e r r u p t i o n (glitching) at the load. Two converters
v e n t s electromagnetic interference on the DC line
m a y be used to supply a single load or three con-
from reaching the regulated output voltage. The unit
verters may be used to supply two independent
is also protected against damage if a reverse input
loads. In this case, the third converter stands by and
voltage is applied by a large reverse rectifier directly
w i l l take over if either of the two converters fail.
across the bus. The capacity of this rectifier is suffic-
I n p u t voltage may vary between 21 and 30V with
ient to trip the system circuit breaker without dam-
transients.
age to the converter.
b. The converter contains a 20 kHz pulse width
m o d u l a t e d DC-DC converter with transformer isola-

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