Shipboard Power Supply

Industry Profile: Shipboard

Military-Grade Shipboard Power Supply


The demanding conditions of a shipboard environment place a number of limitations on the types of power supply that can be used. At Advanced Conversion Technology (ACT), we understand the need for precision-engineered power supply products that meet the requirements of the Naval industry.

For more than 30 years, we have been a valued supplier of military shipboard power supplies. Contact us for reliable, affordable solutions to all your power needs.

About MIL-STD-1399 Section 300

MIL-STD-1399 Section 300 sets out standards for the use of AC power on military shipboard environments. For military vessels, it serves as an important set of best practices for engineers and project managers. MIL-STD-1399 outlines three types of low voltage power supplies that are acceptable for shipboard use:

  • Type I: 440 or 115 V, 60 Hz ungrounded. Type I is the most common type of shipboard power supply, used in most applications.
  • Type II: 440 or 115 V, 400 Hz ungrounded. Type II is used only in limited applications and must be authorized by a special deviation request.
  • Type III: 440 or 115 V, 400 Hz ungrounded. Also limited to restricted use, Type III shipboard power supplies have stricter requirements for acceptable levels of frequency transience and total harmonic distortion (THD).

Shipboard Power Supplies and THD

One of the most important requirements of any type of shipboard power supply is the need to keep total harmonic distortion to an acceptable level. With today’s naval platforms utilizing more and more sophisticated electronics, shipboard sources of prime AC power are required to handle greater loads than ever before. This can cause large current pulses which increase distortion levels and interfere with other system components.

At the moment, there are two accepted topologies for managing interference and THD in shipboard power supplies:

  • active power factor correction (PFC)
  • the use of polyphase transformers combined with tuned LC filters

At ACT, our manufacturing capabilities include both devices, though we recommend the use of PFC power supplies in shipboard environment. For a detailed discussion of why, please see the following article.

Our Products

ACT manufactures multiple off-the-shelf like shipboard power supplies that are engineered to the demanding tolerances required for military use. Whether you need to power satellite communications, submarine electronics or other sensitive devices, our power supplies offer high degrees of reliability in a number of different configurations. Our power supplies can be rack-, bench- or ruggedized frame-mounted and feature multiple outputs, overcurrent protection and other advanced features.

Your Partner for Shipboard Success

Based in Middletown, PA, ACT is ideally located to provide MIL-STD-1399 power supply systems to clients all along the East Coast and throughout the country. In our vertically-integrated facility, we implement industry-leading quality control over all aspects of the manufacturing process, from sheet metal fabrication to final testing. For our customers, this translates to shorter lead times, lower costs, and greater flexibility to accommodate large or special orders.

In addition to our military off-the-shelf like shipboard power supplies, we have the advanced engineering capacity required to modify devices or create application-specific designs from the ground up. Contact our team directly to learn more about our complete selection of products and services.