Applications

Meeting Military Aircraft Electrical Specifications

February 8, 2009
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Meeting Military Aircraft Electrical Specifications

MIL-STD-704* came into being to standardize aircraft electrical requirements for the armed services. Since 1959 there have been a number of modifications to this basic specification, with the latest, MIL-STD-704F, being introduced in 2004. Initially MIL-STD-704 limited itself to two basic voltage buses, a three-phase 115Vac (typically 400Hz) supply with limited single-phase loading and a 28V DC system. Over the years there have been many changes in the surge and transient withstand levels, particularly for the 28Vdc rail and the introduction of a 270Vdc bus. Vicor manufactures parts to meet most of these requirements....

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Droop-Sharing in a Compact Satellite Up-Link

May 10, 2008
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Droop-Sharing in a Compact Satellite Up-Link

Droop-sharing is often the easiest and most reliable method of producing a redundant bus onto a backplane of a rack-based system. The method not only eliminates the need for a complex and vulnerable communications bus between PSUs, but also allows the backplane bus voltage to be further stepped-down to lower voltages to remove the need for absolute and precise regulation. These advantages, in conjunction with Vicor VI DC-DC converters, are being used in a compact satellite up-link, capable of fitting into a 3U rack. The up-link required a distributed bus of +7.2V at 12A...

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EMI Filters Used in Military Vehicle Radios

April 7, 2008
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EMI Filters Used in Military Vehicle Radios

The reliability and compact packages of Vicor Picor modules were key considerations for a Vicor customer in Turkey. The Picor modules are being used to achieve low EMI by reducing switching noise at the converter input, and to reduce the ripple currents at the output of the converter, in multi-band, multi-mode radios designed for use in tactical military vehicles. The QPI family of active EMI filters provides conducted common-mode (CM) and differential-mode (DM) attenuation from 150 kHz to 30 MHz in the CISPR22 range. The proprietary active filtering circuit provides superior attenuation at low...

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Stratospheric Wi-MAX-HAP

January 10, 2008
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Stratospheric Wi-MAX-HAP

The University of York, working with Swiss technology company Strat-XX, are developing a WiMAX-HAP system. This aims to deliver WiMAX wireless broadband services via cellular networks and spot beam antennas as the payload on stratospheric High-Altitude Platforms (HAPs), such as airships or hot-air balloons, at an altitude of around 21 km above the earth. The basic concept for the system is shown below: Using one customer premises equipment (CPE) as a gateway to the wired internet, at least one other remote CPE is linked to the wider internet via the HAP payload. Other users...

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Mid-power Maxi, Mini, and Micro modules for military and aerospace applications

January 7, 2008
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Mid-power Maxi, Mini, and Micro modules for military and aerospace applications

Vicor has introduced a number of new mid-power products to its families of pre-defined modules Maxi, Mini, and Micro DC-DC converters. These modules are well suited to the demands of military and aerospace environments, allowing designers to select standard products better tailored to their specific power and current requirements. Still incorporating Vicor’s patented low-noise Zero-Current and Zero-Voltage Switching (ZCS/ZVS), these products’ inherent low noise greatly reduces the design effort and filtering costs required for power converters to meet various conducted emissions requirements, such as MIL-STD-461. With these new offerings, Vicor can now provide an...

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New MIL-COTS 28 V DC-DC V•I Chip™ Modules: 20% more power and 1/3 the volume in a rugged, miniature package

December 15, 2007
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New MIL-COTS 28 V DC-DC V•I Chip™ Modules: 20% more power and 1/3 the volume in a rugged, miniature package

Vicor’s new MIL-COTS 28 V DC-DC V•I Chip modules consists of a 28 Vdc input PRM™ regulator and a family of VTM™ current multipliers with output voltages from 1 to 50 Vdc. The PRM and VTM chipset provides the full functionality of a DC-DC converter with high efficiency and higher power density, fast transient response, low noise, and flexible thermal management. With each module weighing only 15 grams and measuring just 32.5 x 22 x 6.6 mm, the chipset offers specific advantages for designing power systems in mission-critical portable and airborne applications. A PRM...

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Torpedo Control System

September 24, 2007
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Torpedo Control System

Torpedos are very demanding applications, requiring very reliable and rugged components (including the power supply). Their shape and size also mean that the space left for the power supply element can be very small and the wrong shape to fit a standard box solution! For one Vicor customer, operating in the defense and large systems electronics sectors, in particular in the underwater systems field. One of their most successful applications is a heavy-weight torpedo used as a multipurpose weapon designed to be launched by submarines or surface vessels. The customer required a complete, non-standard...

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