New Technical Library on CD

The CD enables easy access to product data and application notes as well as linking to the internet to provide an up-to-date product catalogue. It gives access to webcasts and seminars, video demos showing how to optimise power supply systems, and a 180-page applications manual explaining the best design approaches and techniques to solve common challenges such as thermal issues, input and output filtering, and EMI considerations.  

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Local and Remote Sensing

The sense leads of 2nd Generation Mini and Maxi modules must always be closed: either directly at the output pins (local sensing) or at the load (remote sensing). When remote sensing is used, all of the wiring impedances – both in the sense leads and power leads – may introduce instabilities into the feedback loop. This can result in oscillation, poor transient response, activation of the output over voltage protection (OVP) or, in extreme cases, possible damage to the module. Care must always be used in lead placement and/or printed circuit board layout to...

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EMI Input Filters Compatible with Most DC-DC Converters

The QPI family of active EMI filters provides conducted common-mode (CM) and differential-mode (DM) attenuation from 150 kHz to 30 kHz. The proprietary active filtering circuit provides superior attenuation for typical power conversion frequencies and supports PICMG ® 3.0 ATCA requirements. The QPI-4 and QPI-6 meet the specifications for the telecom bus: range 36-76 V including 100 V, 100 ms surge capability. Rated at 7 and 14 A, the products support single or multiple DC-DC converters requiring up to 672 W of input power at 48 V input. The QPI-3 and QPI-5 operate over...

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Laser for 3D Glass Engraving

You may have already seen these nice little glass cubes with engraved 3-dimensional faces, animals, machines etc. They are manufactured by focusing a high power laser beam inside the glass. The energy of the laser beam causes micro explosions in the glass. The result is small white dots, and with hundreds of these dots a 3-dimensional picture appears inside the glass. Laser diodes are not only very expensive but also quite sensitive. Precise output regulation is necessary to control the current into the laser diodes. Vicor’s product was an ideal solution because of its...

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Keeping One’s Cool

To provide a long service life, power supplies require adequate cooling. Heat is removed from the supply using conduction, convection and radiation cooling. The equipment casing is sometimes used to conduct heat away. Often additional cooling is required and ambient air (convection) or moving air, e.g. from a fan, is used to remove excess heat. What airflow is required and should an additional heatsink be used? These questions are answered by using Vicor’s Thermal Design Calculator or graphically by using our published charts. The Technical Tip below explains how to use this data. Technical...

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Customers Benefit from Vicor’s Chort Cycle-Time Production Processes

The “component power” concept, where modular building blocks replace discrete component designs, has proved popular partly because customers benefit from the improved time-to-market. Over the past few years Vicor’s investment in automation and lean manufacturing processes has reduced the lead-time for manufactured products from weeks to days. Through our prototype service Vicor can offer delivery of small quantities of any one of 10,000 different standard modules from our factory in typically 10-15 days. Additionally, Power Express offers customers lead-times of less than six weeks on production quantities. Our offices around the world are staffed...

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PFC MicroS: Winning Combination of High Density, Low Profile

PFC MicroS: Winning Combination of High Density, Low Profile

One customer uses two different PFC MicroS configurations in a semiconductor test system. The system is a very large climatic chamber that is configurable to allow the test of different semiconductor families. Dependent upon the type of DUT (device under test) the configuration of the power system is adapted to the task. The power system has three 3-phase 10KW main transformers that independently power the climatic chamber compressor, the control system and the test system. The test system uses 48 channels and each channel has its own dedicated test board that is capable of...

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