||MIL-STD-2036: General Requirements for Electronic Equipment Specifications
Appendix A: Navy Standard
Electronic Power System
30.1 Navy Standard Electronic Power System. The Navy Standard
Electronic Power System places a 155 Vdc node between the electrical
circuits within the combat system equipment and the ship's electrical
distribution system. This node may either be internal to a single equipment or
external and common to a group of functionally compatible equipment. A block
diagram of the Navy Standard Electronic Power System is shown in Figure
30.1.1 Rectifier conditioner. The rectifier
conditioner is a polyphase transformer diode bridge, and LC filter; or another
form of a unity power factor power supply. This conditioner rectifies the
alternating current (ac) line to 155 Vdc while meeting the 3 percent current
harmonic limit, 5 percent load current unbalance and 2500V spike voltage
requirements specified in MIL-STD-1399, section 300.
30.1.2 100ms holdup module. The 100
millisecond (ms) holdup module provides ride through of momentary power
interruptions of up to 100ms duration, and uses capacitors for energy storage.
It is not effective to use batteries for this module due to the internal
voltage drop of the batteries.
30.1.3 5min holdup module. The 5 minutes holdup module provides power to
critical circuits during short term power interruptions of 5 minutes or less.
The 5min holdup module uses batteries for energy storage. Because of the
weight penalty associated with the batteries, 5min holdup will be provided
only for those critical circuits needing continuous power for rapid restart
following restoration of power.
30.1.4 Navy Standard Power Supply. Conversion of the 155
Vdc node voltage to working voltages needed within the equipment shall be
accomplished using Navy Standard Power Supplies (see 220.127.116.11
units are suitable for operation from either 155 Vdc or from 115V, type I
power as specified in MIL-STD-1399, section 300. Navy Standard Power Supplies
provide the working voltages needed by the equipment, and enable the equipment
to ride through the wide voltage variations seen on the ac
30.1.5 Invertors. Where special frequency power or clean 60-Hz
power is required by equipment, a solid state invertor powered from the 155
Vdc node shall be used. The input power specifications for the invertor shall
be the same as specified in Navy Standard Power Supplies in NAVSEA SE